Patent application number | Description | Published |
20090174257 | LARGE POWER MULTI-OUTPUTS POWER SUPPLY STRUCTURE HAVING RELATIVELY HIGH EFFICIENCY IN LOAD RANGE AND CONTROLLING METHOD THEREOF - The configurations of a switched-mode power supply and a controlling method thereof are provided. The proposed switched-mode power supply includes a first output converter receiving a DC input voltage and generating a first high power DC voltage output and at least one low power DC voltage output, and a second output converter receiving the DC input voltage and generating a second high power DC voltage output coupled to the first high power DC voltage output to generate a coupled output, wherein the first output converter works and the second output converter idles when a transient power of the coupled output is not larger than a rated output power of the first high power DC voltage output, and both the first and the second output converters work when the transient power is larger than the rated output power. | 07-09-2009 |
20100210856 | DITHIOLOPYRROLONE COMPOUNDS, THE PREPARATION AND THE USE THEREOF - The invention discloses a dithiolopyrrolone compound represented by formula I or its pharmaceutically acceptable salts, wherein X | 08-19-2010 |
20100331413 | Therapeutic Formulations Based on Asiatic Acid and Selected Salts Thereof - A highly pure asiaticoside and a pharmaceutical grade asiatic acid can be prepared, along with salts of asiatic acid, for use in formulating therapeutic compositions that are suitable for treating arthritis, psoriasis and other inflammatory diseases, as well as pulmonary fibrosis, diabetic nephropathy, and other fibrotic diseases. | 12-30-2010 |
20110122662 | Buck and buck/boost converter systems having auxiliary circuits and method thereof - The configurations of a buck type and a buck/boost type converter systems and a controlling method thereof are provided in the present invention. The proposed buck/boost type converter system includes a rectifier bridge, a first auxiliary circuit including a first unidirectional switch coupled to the rectifier bridge and a second unidirectional switch coupled to the first unidirectional switch, a first capacitor coupled to the first unidirectional switch and the rectifier bridge, a buck/boost converter having a first input terminal coupled to the first unidirectional switch, a second input terminal coupled to the first capacitor, a first output terminal coupled to the second unidirectional switch and a second output terminal, a second capacitor electrically connected to the first and the second output terminals in parallel, and a DC source coupled to the second unidirectional switch. | 05-26-2011 |
20120077794 | BIS-PYRIDYLPYRIDONES AS MELANIN-CONCENTRATING HORMONE RECEPTOR 1 ANTAGONISTS - The invention provides novel bis-pyridylpyridones which are antagonists at the melanin-concentrating hormone receptor 1 (MCHR1), pharmaceutical compositions containing them, processes for their preparation, and their use in therapy and for the treatment of obesity and diabetes. | 03-29-2012 |
20120083489 | BIS-PYRIDYLPYRIDONES AS MELANIN-CONCENTRATING HORMONE RECEPTOR ANTAGONISTS - The invention provides novel bis-pyridylpyridones which are antagonists at the melanin-concentrating hormone receptor 1 (MCHR1), pharmaceutical compositions containing them, processes for their preparation, and their use in therapy and for the treatment of obesity and diabetes. | 04-05-2012 |
20130249315 | SWITCHING COMPONENT AND SWITCH SYSTEM COMPRISING THE SAME - A switching component comprising a number of switch sets in parallel is disclosed herein. Each switch set comprises a number of power switches and a backup power switch in series. The backup power switch has a default position of closed. Rated powers of the power switches and the backup power switch are less than a rated power of the switching component, and the switching component is modular. A switch system comprising the switching component is also described herein. | 09-26-2013 |
20130339770 | MECHANISM FOR FACILITATING POWER EXTENSION SERVICE AT COMPUTING DEVICES - A mechanism is described for facilitating power extension service at computing devices according to one embodiment of the invention. A method of embodiments of the invention includes calculating potential power saving by one or more of a plurality of power-saving techniques supported by a computing device. The calculating includes identifying the one or more of the plurality of power-saving techniques that are available for selection and an expected amount of power to be saved with the one or more of the plurality of power saving techniques. The method may further include generating a list identifying the one or more of the plurality of power-saving techniques and relevant information resulting from the calculation, and | 12-19-2013 |
20140084679 | POWER SUPPLY MANAGEMENT APPARATUS AND METHOD THEREOF - An apparatus comprising an onboard energy storage device, an onboard power conversion device configured to be electrically coupled to an external power source for receiving electrical power therefrom, and at least one drive system electrically coupled to the onboard energy storage device and the onboard power conversion device, wherein the onboard energy storage device and the onboard power conversion device cooperatively provide electrical power for the at least one drive system. A vehicle and a method for managing power supply are also disclosed. | 03-27-2014 |
20140265942 | ELECTRIC VEHICLE WITH IMPROVED ELECTRIC DRIVE SYSTEM - An apparatus includes at least one energy source and a drive system coupled to the at least one energy source. The drive system converts electrical power received from the at least one energy source and provides converted electrical power for driving at least one load. The drive system includes a first converter, a second converter, and a first switch module coupled to outputs of the first and second converters. When the apparatus is operating under a first mode, the first switch module is switched to assume a first state to allow a first output electrical power provided from the first converter and a second output electrical power provided from the second converter to be combined for driving a first load with the combined output electrical power. | 09-18-2014 |
20140277884 | DRIVE SYSTEM AND METHOD FOR DRIVING A VEHICLE - A drive system includes a control unit and a traction device. The control unit is configured to receive a load variation signal indicating a vehicle load is to be or being changed and generate a traction torque in response to the load variation signal. The traction device is coupled to the control unit and configured to drive a vehicle according to the traction torque. | 09-18-2014 |
20150081152 | APPARATUS AND METHOD FOR ELECTRIC BRAKING - The present invention discloses an apparatus comprising an energy source, a first motor, a second motor and a control system. The first motor is configured to drive a first load and the second motor is configured to drive a second load. The control system is coupled to the energy source, the first and the second motors. The control system dumps the baking power generated by the first load at least partially on the first motor according to a first baking command. The control system dumps the baking power generated by the second load at least partially on the second motor, according to a second baking command. The present invention also discloses other varieties of apparatuses, vehicles, such as electric tractors, electric forklifts and relative methods, etc. | 03-19-2015 |
20150102667 | PROPULSION SYSTEM AND METHOD FOR DRIVING A VEHICLE - A propulsion system includes a traction drive system, a boost converter, an energy-type energy source, a power-type energy source, and an energy management system. The boost converter includes a high voltage side and a low voltage side. The boost converter is coupled to the traction drive system on the high voltage side. The energy-type energy source is coupled to the boost converter on the low voltage side thereof. The power-type energy source is coupled to the boost converter on the low voltage side thereof. The energy management system is coupled to the boost converter and configured to control the energy-type energy source and the power-type energy source through the boost converter in at least two conditions during a motoring mode. | 04-16-2015 |
20150120130 | VEHICLE CONTROL SYSTEM - A system includes a contactor system, a vehicle control unit, and a fault diagnostic system. The contactor system includes one or more contactors. The vehicle control unit is coupled to the contactor system via a first connection and a second connection. The vehicle control unit is configured to provide a controlling signal to the contactor system through at least one of the first connection and the second connection to control the one or more contactors. The fault diagnostic system is configured to identify faults occurring in the first connection and the second connection. A method is also provided. | 04-30-2015 |
Patent application number | Description | Published |
20090249534 | SEAT WITH MASSAGE FUNCTION - A toilet seat includes a body with a plurality of massage mechanisms installed in the body, and means for sealing the massage mechanisms. The massage mechanism includes a housing which comprises an upper part and a lower cover part, a motor held between the upper part and the lower cover part, an eccentric weight fixed to the output shaft of the motor, and a resilient suspension device for suspending the assembly of the motor, the eccentric weight and the housing inside the body. The suspension device includes a housing fixing end fixed to the housing, a body fixing end fixed to the body, and a connecting part connected between the two fixing ends. In use, the motor rotates the eccentric weight to thereby produce vibrations which are transmitted to a user sitting on the seat. | 10-08-2009 |
20100017950 | DRIVE APPARATUS FOR BIDET TOILET - Apparatus for driving a nozzle of a bidet toilet, has a base | 01-28-2010 |
20120106570 | Method and terminal for data transmission - The disclosure discloses a method and terminal for data transmission. The method comprises: receiving a connection establishment request from an application processor by a communication processor; sending a response for indicating that the connection establishment is successful to the application processor and instructing a multiplexing module of the application processor to allocate a multiplexing channel via the response by the communication processor; allocating a multiplexing channel by a multiplexing module of the communication processor; and performing data transmission with the application processor through the multiplexing channel by the communication processor. The effect of a high-speed Web data transmission in a terminal can be achieved according to the disclosure. | 05-03-2012 |
20120142332 | DATA DOWNLOAD METHOD AND TERMINAL - The present invention provides a data downloading method and a terminal, wherein the data downloading method includes: a communication processor receiving an open channel request from a universal integrated circuit card, and sending a connection request message to an application processor according to the open channel request; the communication processor sending a connection success message to the universal integrated circuit card, so as to instruct the universal integrated circuit card to download data The present invention not only enables a process of downloading an application over the air to the UICC by using the BIP (bearer independent protocol) protocol to be completed in a single processor, but also supports the process to be completed in multiple processors. | 06-07-2012 |
20120233352 | METHOD AND SYSTEM FOR MANAGING INTERNET ADDRESS BASED ON TERMINAL - A method for terminal-based Internet address management is disclosed by the disclosure, and the method includes: a terminal sends a network address conflict message to a Universal Integrated Circuit Card (UICC) when a network address of a subnet which a terminal accesses conflicts with the network address of the subnet in which the UICC is currently located; after receiving the network address conflict message, the UICC releases an IP address currently used, and returns a corresponding release message to the terminal, wherein the IP address consists of a network address and a host address; the terminal and the UICC re-obtain non-conflicting IP addresses. Accordingly, a system for terminal-based Internet address management is also disclosed by the disclosure. Since the terminal of the disclosure can timely notify the UICC to change IP addresses when network address conflict occurs, the disclosure can prevent communication error caused by the conflict of network addresses, and thus improving communication stability. | 09-13-2012 |
20130012184 | METHOD, SYSTEM AND DEVICE FOR INITIALIZING INTERNET DEVICE - This disclosure discloses a method, system and device for initializing an internet device. The method mainly comprises: an application module queries, through a handshake negotiation with a communication module, network standard information, sends the hardware configuration information needed to the communication module, and then informs the communication module of the determined hardware configuration information; and the communication module initializes hardware devices according to the initialization operation information in a stored set of available initialization operation information matched with the hardware configuration information. This disclosure avoids the setting of different software versions corresponding to different hardware ports and parameter configurations and reduces the complexity of system maintenance and management. Besides, the application module can use the same set of codes to adapt to communication modules of different network standards, thus further reducing the complexity of system maintenance and management. | 01-10-2013 |
20130063036 | CIRCUIT FOR ELIMINATING THRESHOLD VOLTAGE DIFFERENCE BETWEEN BACKLIGHT LED STRINGS AND LIQUID CRYSTAL DISPLAY USING THE SAME - The circuit eliminating threshold voltage differences between backlight LED strings includes a voltage supply input, a number of first switching units, and a number of LED strings. The LED strings are connected to each other in parallel, and one end of each LED string is connected to the voltage supply input and the other end thereof is connected to the corresponding first switching unit. The constant current controller includes a constant current source for supplying a constant current to each LED string, a current detector for detecting a working current of each LED string, a comparator for comparing the working current of each LED string and the constant current, and outputting a comparing result, and a square wave generator for outputting driving signals of different frequencies each which is capable of driving the corresponding LED string to work at the corresponding frequency. | 03-14-2013 |
20130127351 | DRIVING CIRCUIT AND LED BACKLIGHT MODULE USING THE SAME - A driving circuit for a LED backlight module includes a brightness adjusting module, a current detector, a reference voltage adjusting module, and a comparing module. The current detector is capable of detecting the current of the brightness adjusting module and outputting a detecting result. The reference voltage adjusting module is capable of choosing the corresponding reference voltage corresponding to the detecting result of the current detector. Thus, the reference voltage outputted to the comparing module can be adjusted according to the change of the current of the brightness adjusting module. This reduces the power consumption and the amount of heat generated due to the power consumption, and improves the performance of the LED backlight module. | 05-23-2013 |
20130135774 | LIGHT-EMITTING DIODE DRIVING CIRCUIT HAVING SHORT CIRCUIT PROTECTION - The present invention discloses a light-emitting diode driving circuit having short circuit protection. The light-emitting diode driving circuit has a boost circuit, a first switch unit, a light-emitting diode string and a control chip. The boost circuit receives an input voltage and outputs a relatively higher output voltage. The first switch unit is connected between the boost circuit and the light-emitting diode string. The control chip is connected to the boost circuit and the first switch unit, and controls the first switch unit to be cut off when the light-emitting diode string is short-circuited, so as to cut off the current loop from the input power source to the light-emitting diode string to achieve the object of short-circuit protection and stopping power consumption. | 05-30-2013 |
20130271443 | DRIVING CIRCUIT OF BACKLIGHT MODULE AND DISPLAY APPARATUS USING THE SAME - The present invention provides a driving circuit of a backlight module and a display apparatus using the same. The driving circuit comprises at least one transistor connected to light-emitting diodes (LEDs), a constant-current circuit connected to the transistor, a power resist connected to the transistor in parallel; and a power switch connected between the transistor and the power resist, wherein a switch signal is transmitted to the power switch, and a signal level of the switch signal in a three-dimensional (3D) image mode is higher than another signal level of the switch signal in a two-dimensional (2D) image mode. The present invention can be applicable to the display apparatus for raising a brightness of the backlight module in the 3D image mode. | 10-17-2013 |
20130271701 | LED Backlight Drive Circuit, Liquid Crystal Display Device and Driving Method - The invention discloses an LED backlight drive circuit, an LCD device and a driving method. The LED backlight drive circuit includes a power source; an output capacitor and an LED lightbar which is connected in series with a first controllable switch are in parallel connection, and then are arranged between the output terminal and the ground terminal of the power source. The LED backlight drive circuit further includes a first comparator; a cathode of the first comparator is connected to a first reference voltage, an anode of the first comparator is coupled with the output terminal of the power source, and the output terminal of the first comparator is coupled with a control end of the first controllable switch; when the anode voltage of the first comparator exceeds the cathode voltage, the output terminal of the first comparator drives the first controllable switch to be conducted. In the invention, the LED lightbar only can be conducted at the predetermined voltage. Thus, the LED will be unable to be lighted even if the electric quantity is stored in the output capacitor; only when the output voltage achieves the predetermined voltage in the complete ON operation, the first controllable switch is able to be conducted, which solves the problem of LED blinking in the ON operation. | 10-17-2013 |
20130285571 | LED Backlight drive circuit, LCD Device and Driving Method - The invention provides an LED backlight drive circuit, an LCD device and a driving method. The LED backlight drive circuit comprises a plurality of LED lightbars which are arranged in parallel connection, and a detection module; a comparison unit is arranged in said detection module, the comparison ends of the comparison unit are respectively coupled to the output ends of the LED lightbars, and the reference end thereof is coupled with an adjustable reference voltage module. In the invention, because the comparison unit is used, and the reference end of the comparison unit is coupled to an adjustable reference voltage module, different reference voltages are selected in accordance with different output end voltages of the LED lightbars of the LCD device. If the voltage difference between the output end voltage of the LED lightbar and the reference voltage is controlled within a reasonable range, the comparison accuracy can be effectively improved. The maximum voltage difference of the LED lightbar is fed back to the power source end of the drive circuit to regulate the output of the power source. | 10-31-2013 |
20130286311 | LCD Device and a Transforming Circuit Thereof - The present invention proposes a liquid crystal display device and a transforming circuit thereof. One terminal of a first coil connects to input voltage. One terminal of a energy-storage unit connects to the other terminal of the first coil. One terminal of a second coil connects to the other terminal of the energy-storage unit, and the other terminal of the second coil connects to the light source. An input terminal of a unidirectional unit connects to the one terminal of the first coil which is connected to the input voltage, and the output terminal connected to the one terminal of the second coil which is connected to the light source. A driving signal is fed into a controlling terminal of a switch unit. A first terminal of the switch unit is grounded, and the second terminal of the switch unit is connected a medial point between the first coil and the energy-storage unit. | 10-31-2013 |
20130293136 | DRIVING METHOD FOR BACKLIGHT UNIT OF LIQUID CRYSTAL DISPLAY AND SYSTEM THEREOF - A method for driving the backlight unit of the liquid crystal display includes: comparing the strength of a soft start signal with a predetermined signal through a comparator circuit, and generating a first comparison signal or a second comparison signal according to the comparison result; outputting a first frequency from a frequency modulation circuit according to the first comparison signal; and increasing the rising rate of the output voltage of a boost converter according to the first frequency. Therefore, the rising rate of the output voltage is increased, thereby solving the screen-flickering problem. | 11-07-2013 |
20130300983 | LED Backlight Driving Circuit, Liquid Crystal Display Device and Driving Circuit - The invention discloses an LED backlight driving circuit, an LCD device and a driving circuit. The LED backlight driving circuit includes a power supply module, an LED lightbar coupled with an output terminal of the power supply module, a dimming module coupled with the output terminal of the LED lightbar, and the LED backlight driving circuit further includes a transfer switch. A first input terminal of the transfer switch is coupled to the output terminal of the LED lightbar, and a second input terminal of the transfer switch is coupled to a feedback voltage. The output terminal of the transfer switch is coupled to the power supply module. The transfer switch is switched to the first input terminal when the dimming module is ON, and the transfer switch is switched to the second input terminal when the dimming module is OFF. Therefore, the LEDs of the invention can operate normally within the short dimming cycle. The invention only adds one transfer switch, the circuit is simple and does not increase the circuit area, and the cost is low. | 11-14-2013 |
20130307878 | LED Backlight Driving Circuit, Backlight Module, and LCD Device - The invention provides an LED backlight driving circuit, a backlight module, and an LCD device. The LED backlight driving circuit includes an LED light string; an input end of the LED light string is directly connected with an input end of a power source, and an output end of the LED light string is coupled with a buck module. In the invention, because the output end of the LED light string is in series connected with the buck module, the LED light string is connected in series between an input voltage and an output voltage, and a part of LEDs are directly supplied by the input voltage without the first stage conversion. Thus, the energy supplied by the buck module is reduced, the conversion efficiency is improved, the energy efficiency is increased, the requirement of the buck module to withstand voltage is reduced, and the device standard is decreased, thereby favoring cost reduction. | 11-21-2013 |
20130322059 | LED Backlight System and Display Device - The present invention provides an LED backlight system and display device. Backlight system includes power source module, LED array, master switch module, current detection module, current equalizer module and current shunt module. LED array is connected to power source module and includes LED strings with common anode. Master switch module includes first switch transistors for receiving switch control PWM signal of LED strings. Current detection module outputs current feedback signals corresponding to currents of LED strings. Current equalizer module is connected to current detection and includes equalizer control unit and equalizer switch unit. Based on current feedback signal, equalizer control unit controls on-and-off of equalizer switch unit. Current shunt module is connected in parallel with current equalizer module and performs current shunt on current equalizer module. As such, the present invention reduces energy-consumption of current equalizer module and temperature of LED drive chip. | 12-05-2013 |
20140009455 | LED BACKLIGHT DRIVING CIRCUIT, BACKLIGHT MODULE, AND LCD DEVICE - The present disclosure discloses a light emitting diode (LED) backlight driving circuit, a backlight module, and a liquid crystal display (LCD) device. The LED backlight driving circuit includes an LED lightbars. An output end of the LED lightbar is connected with a control integrated circuit (IC) in series, and is also connected with a shunt controllable switch. The shunt controllable switch is switched on when a voltage of the output end of the LED lightbar exceeds a preset value and is switched off when the voltage is less than the preset value. In the present disclosure, because a shunt controllable switch is connected in parallel in the control IC, when the LED lightbars are short-circuited, the shunt controllable switch is switched on, a part of current flows towards the shunt controllable switch, and the burden of the control IC is alleviated. Thus, the temperature of the control IC is reduced. | 01-09-2014 |
20140016304 | LED BACKLIGHT DRIVING CIRCUIT, BACKLIGHT MODULE, AND LCD DEVICE - A backlight driving circuit includes a plurality of display areas, and each display area includes a first LED light cluster and a second LED light cluster which are symmetrical. The first LED light cluster and the second LED light cluster are connected in series to form a plurality of LED lightbars connected in parallel connection at two ends of the power source of the backlight driving circuit. Because the LED light clusters of the same display area are connected in series namely more than two small lightbars are connected in series to form a large LED lightbar, the small lightbars only occupy one pin of the constant current circuit. The LEDs on both sides of the same display area of the 3D display device can be simultaneously turned on or simultaneously turned off, and can be completely connected in series for use. | 01-16-2014 |
20140043972 | Service Instance Mapping Method, Apparatus and System - The present invention discloses a service instance mapping method, apparatus and system. The service instance mapping method includes: correlating a layer-2 service instance with a service access port of the service instance, and determining correspondence between the service access port and a service instance identifier; and mapping the service instance identifier to a service label of a packet. In embodiments of the present invention, because the service label is adopted to carry the service instance identifier, a higher service label supporting capability may be included, more service instances may be supported, and a multi-tenant requirement in a large-scale public cloud environment can be met; control protocol support is extended, and extension of a TRILL protocol can fulfill a higher service development capability. | 02-13-2014 |
20140139110 | LED BACKLIGHT DRIVING CIRCUIT, BACKLIGHT MODULE, AND LCD DEVICE - A light emitting diode (LED) backlight driving circuit includes an LED lightbar, and a constant current chip that controls current flowing through the LED lightbar. The LED backlight driving circuit further includes a comparison module that receives an output voltage of the LED lightbar. When the output voltage of the LED lightbar is greater than the preset reference voltage, the comparison module controls the constant current chip to switch off the current of the LED lightbar. | 05-22-2014 |
20140152535 | LED BACKLIGHT DRIVER CIRCUIT, LCD DEVICE AND DRIVING METHOD - A light emitting diode (LED) backlight driver circuit includes at least two lightbars which are independently driven, an output end of each lightbar is coupled with a constant current driver integrated circuit (IC), and a monitoring module controlling the constant current driver IC. The monitoring module outputs a phase delay time to drive each lightbar and a current duty of each lightbar to the constant current driver IC, and the constant current driver IC drives the lightbars one by one according to the corresponding current duty in accordance with the phase delay time in sequence. | 06-05-2014 |
20140252984 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND DRIVING CIRCUIT - The present disclosure provides a light emitting diode (LED) backlight driving circuit, a liquid crystal display (LCD) device, and a driving circuit. The LED backlight driving circuit includes a timing control module, an LED lightbar, and a driver module coupled with an output end of the LED lightbar. The driver module includes at least one constant current driver chip driving the LED lightbar to display. The timing control module successively outputs a driving signal to the constant current driver chip. The driving signal includes data units which are arranged in sequence, and each data unit storing a current duty and a phase delay of one LED lightbar. The constant current driver chip directly reads data of a corresponding data unit and drives the LED lightbar to display. | 09-11-2014 |
20140253842 | Driver for LED Backlight and LED Backlight Module and Liquid Crystal Display - LED backlight driver, LED backlight module, and liquid crystal display are disclosed. The LED backlight driver comprises DC voltage input end, boost circuit, LED string, and constant current driver. The DC voltage input end is used for inputting a DC voltage. The boost circuit is used for boosting the DC voltage input from the DC voltage input end and outputting a boosted DC voltage. The LED string comprises a plurality of LEDs connected in series and a first resistor. The LED string receives the boosted DC voltage from the boost circuit. A sum of forward voltages of all of the LEDs in the LED string is less than or equal to the boosted DC voltage output from the boost circuit. The constant current driver is used for outputting a level signal to the boost circuit based on a voltage across the first resistor and a voltage for a triangular signal. | 09-11-2014 |
20140265925 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRVING CIRCUIT - The present disclosure provides a light emitting diode (LED) backlight driving circuit, a liquid crystal display (LCD) device, and a method for driving the LED backlight driving circuit. The LED backlight driving circuit includes an odd number of LED lightbars and a constant current driver chip including an even number of channels. The channels include a work channel connected to the LED lightbar, and a dangling channel that is not connected to the LED lightbar. The dangling channel is connected to a reference signal, and a voltage of the reference signal is more than an internal comparison voltage of the constant current driver chip. | 09-18-2014 |
20140292824 | BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE BACKLIGHT DRIVING CIRCUIT - A backlight driving circuit includes a transformer, a controllable switch connected in series with a primary side of the transformer, a voltage collection unit receiving a voltage of the primary side of the transformer, and a comparing unit coupled to the voltage collection unit. When an output voltage of the voltage collection unit is less than a preset reference voltage, the comparing unit drives the controllable switch to turn on. | 10-02-2014 |
20140333520 | LED BACKLIGHT DRIVING CIRCUIT, BACKLIGHT UNIT, AND LCD DEVICE - A light emitting diode (LED) backlight driving circuit includes a power supply, an LED light bar coupled to the power supply, a constant current driving chip that drives the LED light bar to light, and a comparing unit. The constant current driving chip includes an under-voltage protection pin that receives an under-voltage protection signal. An overvoltage collecting unit of the LED backlight driving circuit and an under-voltage collecting unit of the LED backlight driving circuit are coupled to an input end of the power supply, and an output voltage of the under-voltage collecting unit is directly input to the under-voltage protection pin. A reference voltage is input to a first input end of the comparing unit, and a second input end of the comparing unit is coupled to the overvoltage collecting unit. When an output voltage of the overvoltage collecting unit exceeds the reference voltage, the comparing unit sends the under-voltage protection signal to the under-voltage protection pin. | 11-13-2014 |
20140340000 | BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE BACKLIGHT DRIVING CIRCUIT - A backlight driving circuit includes a constant current driving chip, a power module, and a light emitting diode (LED) lightbar coupled with the power module. The constant current driving chip includes a control module that controls switching frequency of the power module, and an adjusting module that adjusts duty cycle of effective current flowing through the LED lightbar. The control module includes a frequency pin used to set the switching frequency of the power module. An external pulse-width modulation (PWM) dimming signal is sent to the adjusting module of the constant current driving chip. The backlight driving circuit further includes a detection module that detects duty cycle of the PWM dimming signal, and a monitor module coupled with the detection module of the backlight driving circuit. | 11-20-2014 |
20140340295 | LED BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE LED BACKLIGHT DRIVING CIRCUIT - A light emitting diode (LED) backlight driving circuit includes a power supply, an LED light bar, and a constant current driving chip that adjusts brightness of the LED light bar. The constant current driving chip receives the PWM dimming signal. N boost units are connected in series between the power supply and the LED light bar, and the N boost units are connected in parallel with each other. Comparing units are correspondingly coupled to control ends of one or more of (N−1) boost units. When a duty ratio of the PWM dimming signal is less than a preset threshold, the comparing unit drives a corresponding boost unit to turn off. N is an integer greater than or equal to 2. | 11-20-2014 |
20140354180 | BACKLIGHT DRIVING CIRCUIT, LCD DEVICE, AND METHOD FOR DRIVING THE BACKLIGHT DRIVING CIRCUIT - A backlight driving circuit includes a light emitting diode (LED) lightbar, a power supply driving the LED lightbar, a constant current driving chip controlling the power supply and the LED lightbar, and a control unit monitoring a voltage of a cathode of the LED lightbar. The constant current driving chip includes a main control unit that drives the power supply, and an adjusting unit that adjusts brightness of the LED lightbar. An input end of the adjusting unit is coupled to the cathode of the LED lightbar, and an output end of the adjusting unit is coupled to a load unit, a resistance value of the load unit may be adjusted. When the voltage of the cathode of the LED lightbar is greater than or equal to a preset threshold, the control unit controls the load unit to reduce the resistance value of the load unit. | 12-04-2014 |
20150054859 | DRIVING CIRCUIT AND DRIVING METHOD FOR LIGHT EMITTING DIODE AND DISPLAY APPARATUS USING THE SAME - The present invention provides a driving circuit and a driving method for light-emitting diodes (LEDs), and a display apparatus using the same. The driving circuit comprises a power switch and a dimmer circuit. The method comprising: providing a pulse width modulation (PWM) dimming signal and a high frequency dimming signal; and multiplying the PWM dimming signal and the high frequency dimming signal for providing a driving signal to the power switch. The present invention can improve a dimming effect of the LEDs. | 02-26-2015 |
20150062483 | BACKLIGHT DRIVING CIRCUIT AND LIQUID CRYSTAL DISPLAY - A backlight driving circuit is disclosed. The backlight driving circuit includes a boost circuit, a constant-current driving chip, a detecting module and a LED string coupled with the boost circuit. The boost circuit boosts an input voltage and then provides the boosted voltage to the LED string. The detecting module receives and calculates external PWM optical signals to obtain a duty-cycle ratio of the PWM optical signals, and compares the duty-cycle ratio of the external PWM optical signals with a predetermined threshold to determine if control signals have to be generated for the constant-current driving chip such that the constant-current driving chip controls the current passing through the LED string. The backlight driving circuit can operate normally even when the duty-cycle ratio of the PWM optical signals is very small. In addition, a liquid crystal display includes the above backlight driving circuit is also disclosed. | 03-05-2015 |
20150069927 | LCD BACKLIGHT MODULE AND METHOD FOR CONTROLLING THE SAME - The present invention discloses an LCD backlight module, which includes a backlight source and a backlight source control device, the backlight source control device comprising: a first switch; a boost module; a control module, utilized to control the first switch, so that the backlight source is switched on off under the control of the control module, and utilized to control the boost module, so that the boost module keeps outputting the voltage after the backlight source is turned off by the first switch. | 03-12-2015 |
20150223304 | LED BACKLIGHT DRIVING CIRCUIT AND LCD DEVICE - A light emitting diode (LED) backlight driving circuit includes an LED light bar, a voltage conversion unit that drives the LED light bar to light, and a driving chip that controls the voltage conversion unit. The driving chip includes a temperature collecting unit that uses a thermistor, an adjusting device coupled to the temperature collecting unit, and a voltage protection unit coupled to an output end of the voltage conversion unit. When temperature of the thermistor exceeds a preset threshold, the thermistor controls the temperature collecting unit to output a protection signal and the adjusting device controls the voltage conversion unit to output a driving voltage that exceeds an over-voltage protection threshold of the LED backlight driving circuit according to the output protection signal, and the voltage protection unit starts an over-voltage protection function. | 08-06-2015 |
20150280542 | CIRCUIT AND METHOD FOR REDUCING INDUCTOR MAGNETIC-CORE LOSS - A circuit for reducing inductor magnetic-core loss is disclosed. The circuit includes a switch transistor, a PWM signal source connecting to the switch transistor, an inductor connecting to the switch transistor, a load connecting to the switch transistor, and a frequency adjustment circuit. The frequency adjustment circuit obtains PWM signals from the PWM signal source and modulates the PWM signals to be a new square-wave signals to be outputted to the switch transistor. The switch transistor is configured for setting the frequency of the square-wave signals as the operation frequency so as to control a duration for which the current flowing through the inductor. The operation frequency of the switch transistor may be adjusted by modulating the frequency of the PWM signals. As such, the duration for which the current flowing through the inductor may be controlled so as to decrease the current amount flowing through the inductor. | 10-01-2015 |