Patent application number | Description | Published |
20110233349 | SUPPORT FRAME - A support frame to support an electronic component of a computer system is provided. The support frame includes four support posts and two pairs of brackets mounted on the support posts. Each bracket includes a bottom surface and two side edges extending from opposite sides of the bottom surface along the same axis. A guide member is slidably mounted between one pair of brackets. The guide member includes a main body and two sliding portions positioned on opposite sides of the main body. A plurality of rolling members is movably mounted between the sliding portion and the corresponding side edges of the at least one pair of brackets. The electronic component is secured to the main body, and generating an amount of roll friction when the electronic component is inserted into or withdrawn from the brackets. | 09-29-2011 |
20120057284 | COMPUTER ENCLOSURE - A computer enclosure includes a side panel, and a number of rolling assemblies mounted on the side panel. When the rolling assemblies contact a surface, the computer enclosure can be moved with rolling of the rolling assemblies on the surface. | 03-08-2012 |
20120073478 | COMPUTER DESK - A computer desk includes a desk body, a desktop, and a cover. The desktop defines a first groove and a second groove defined at a bottom of the first groove for receiving a liquid crystal display. The cover detachably covers the first groove. | 03-29-2012 |
20120086644 | KEYBOARD - A keyboard includes a mainbody, a number of keys, an interface, a control circuit, a switch, and a light emitting diode (LED). The interface includes a first group of pins and a second group of pins. The first and second groups of pins are connected to a motherboard. One of the second group of pins receives a +5V_standby voltage or a +3.3V_standby voltage from the motherboard. The control circuit is set inside the mainbody and is connected to the keys and the first group of pins of the interface. One of the second group of pins of the interface is further connected to an anode of the LED through the switch, and a cathode of the LED is grounded. | 04-12-2012 |
20120093556 | KEYBOARD KEY OF INPUT DEVICE - A key includes a frame with a top, a fluorescent layer coated on the top, and a symbol protruding up from the fluorescent layer. | 04-19-2012 |
20120133261 | ENCLOSURE WITH SLIDE ASSEMBLIES - An enclosure includes a bottom plate, and a plurality of slide assemblies fixed to the bottom plate. Each of the plurality of slide assemblies includes a fixed member fixed to the bottom plate, and a rotary member rotatably received in the fixed member. The rotary member includes a first fixed and a second fixed portions, and a wheel. The first fixed portion is fixed to the second fixed portion, the second fixed portion is connected to the fixed member, and the wheel is fixed to the first fixed portion. The rotary member is operable to be in a first position to expose the wheels for moving the enclosure, and in a second position to be received in the fixed member. | 05-31-2012 |
20120137036 | BASIC INPUT OUTPUT SYSTEM REFRESH APPARATUS - A basic input output system (BIOS) refresh apparatus includes a jumper device, which includes a first pin, a second pin connected to a power source through a resistor, a third pin, and a grounded fourth pin. A master BIOS socket includes a voltage pin connected to the power source and a signal pin connected to the first pin of the jumper device. A slave BIOS socket includes a voltage pin connected to the power source and a signal pin connected to the third pin of the jumper device. Other pins of the master BIOS socket are correspondingly connected to other pins of the slave BIOS socket. The signal pin of the master BIOS socket or the slave BIOS socket receives high level signal to make a corresponding BIOS chip mounted thereon work when the first or third pin is connected to the second pin of the jumper device. | 05-31-2012 |
20120140395 | MONITOR WITH RETRACTABLE KEYBOARD - An assembly includes a monitor, a base, a post extending up from the base for supporting the monitor, and a keyboard. The base defines a receiving space for receiving the keyboard. | 06-07-2012 |
20120146345 | FIXING APPARATUS FOR BATTERY - A fixing apparatus includes a base and a latch. A number of fixing holes is defined in the base for receiving supporting posts of different batteries. A first end of the latch is pivotably connected to a side of the base, and a second end opposite to the first end of the latch is detachably engaged with an opposite side of the base. A resilient tab extends downwards from a middle of the latch. | 06-14-2012 |
20120146801 | POWER-SAVING REMINDER CIRCUIT FOR COMPUTER - An anode of a light emitting diode (LED) and a second terminal of a third electrical switch are connected to a first power source. First terminals of the first and second electrical switches are respectively connected to a second power source and a suspend signal pin. A second terminal of the first electrical switch is connected to a cathode of the LED and an output pin of a counter chip. A second terminal of a second electrical switch is connected to the first power source through a first resistor and a first terminal of the third electrical switch. A third terminal of the third electrical switch is grounded through second and third resistors and a capacitor in sequence and a voltage pin of the counter chip. | 06-14-2012 |
20120147581 | MOUNTING APPARATUS FOR EXPANSION CARDS - A mounting apparatus for mounting an expansion card with a cover plate to a rear panel includes a retaining member fixed to the rear panel, and a pressing member slidably attached to the retaining member. The pressing member can be slid down to press the cover plate of the expansion card. The pressing member can be slid up to release the cover plate of the expansion card. | 06-14-2012 |
20120154992 | ELECTRONIC DEVICE - An electronic device includes a shell, and a wire holder. The wire holder includes a plate mounted to an outer side of the shell, and a number of arc-shaped latches extending out from the plate, to hold cables of peripheral connectors. | 06-21-2012 |
20120268175 | ADAPTOR CIRCUIT FOR POWER SUPPLY - A adaptor circuit for a power supply includes a first comparison circuit, a timing circuit; and a second comparison circuit. An input of the first comparison circuit is electrically connected to a PS_ON terminal. The first comparison circuit includes a diode. An input of the second comparison circuit is electrically connected to the diode of the first comparison circuit via the timing circuit. When the PS_ON signal is powered on, the diode is off, and the timing circuit charges up in a predetermined time, and the second comparison circuit outputs a PWR_GOOD signal after the predetermined time. When the PS_ON signal is powered off, the diode turns on, and the timing circuit discharges, so the second comparison circuit stops outputting a PWR_GOOD signal. | 10-25-2012 |
20120268377 | KEYBOARD AND ELECTRONIC DEVICE USING SAME - A keyboard for an electronic device includes a main body, a test indicator positioned on an outside surface of the main body, and an interface electrically connected to both the main body and the test indicator. Both the main body and the test indicator are electrically connected to a main board of an electronic device through the interface. The electronic device can be operated using the keyboard, and the test indicator indicates the working status of the electronic device. | 10-25-2012 |
20120273172 | HEAT DISSIPATION DEVICE - A heat dissipation device for a computer case is positioned over a hole of the computer case. The heat dissipation device includes a fan, two motors, two plates, and a controller. The fan is fixed in the computer case, and covers the hole. The two motors are positioned at two opposite sides of the fan. Each motor has a motor shaft parallel to a fan shaft of the fan. The two plates are respectively fixed on the two motor shafts. A distance between the two plates along the direction parallel to the motor rotor is greater than or equal to the thickness of the board. A controller is electrically connected to the fan and the two motors. The controller controls the two motors rotate the two boards for exposing or blocking the hole as the fan is on or off. | 11-01-2012 |
20130160034 | POSITIONING STRUCTURE FOR HOLDING OPTICAL DISK DRIVE AND ELECTRONIC DEVICE USING THE SAME - A positioning structure for fixing an optical disk drive includes a case and a tray. The case includes a support plate and a cover located on the support plate, a receiving cavity is defined between the support plate and the cover. A groove is defined in the support plate. The tray includes a sidewall and a fixing portion located adjacent to the sidewall. The fixing portion includes a clasp portion, and the clasp portion is received in the groove. | 06-20-2013 |
20130214721 | PORTABLE ELECTRONIC DEVICE COMPRISING SOLAR POWERED FUNCTION - A portable electronic device includes a battery, a normal charge module, a solar powered module, and a switch. The normal charge module charges the battery from a commercial power source. The solar powered module includes a solar panel and a voltage converting circuit, the solar panel converts light into electricity outputs a voltage of the electricity to the voltage converting circuit, the voltage converting circuit converts the voltage output from the solar panel into a charging voltage, and rectifies and filters the charging voltage which is then output to the battery, to charge the battery. The switch selectively connects the battery either to the normal charge module or to the solar powered module. | 08-22-2013 |
20130301209 | PCI CARD SECURING MECHANISM - A Peripheral Component Interconnection (PCI) card securing mechanism includes a fixing assembly and an operating assembly. The fixing assembly includes a sidewall defining a notch and a clasp, and a fixing plate attaching to a PCI card. The fixing plate includes a resisting portion, and a clasp portion engaging with the clasp. The operating assembly includes a rotary body including an elastic strip, and a cover fixed on the sidewall. The cover is received in the notch. The rotary body is rotatably received in the cover. The resisting portion is inserted into the cover, and the rotary body is rotated to move into the cover to allow the resisting portion to be clamped between the elastic strip and a peripheral wall of the cover. The rotary body is rotated to move out of the cover when removing the PCI card. | 11-14-2013 |
20130308264 | HOLDING FRAME FOR HARD DISK DRIVES - A holding frame includes a holder body, a printed circuit board, a rotatable cover, and a subsidiary hard disk drive assembly. The rotatable cover is rotatably connected to the holder body. The subsidiary hard disk drive assembly is slidably attached to the rotatable cover, and faces the printed circuit board. | 11-21-2013 |
20130313990 | DISPLAY AND LIGHT SOURCE - A device includes a light emitting diode (LED) module and a switch. The switch further includes a first contact grounded through a first resistor, a second contact grounded through a second resistor, and a fixed contact connecting to the LED module. When the fixed contact is connected to the first contact and the first resistor, the device is operated as a display device and the LED module is operated as a backlight source for the display device. When the fixed contact is connected to the second contact and the second resistor, the LED module is operated as a light source. | 11-28-2013 |
20130318636 | COMPUTER CHASSIS WITH PROTECTION AGAINST INSECTS - A computer chassis includes a chassis body, a control unit, a motor unit, a gate unit and a detection unit. The chassis body defines an opening. The motor unit is electronically connected to the control unit. The gate unit is connected to the motor unit. The detection unit is electronically connected to the control unit. The gate unit and the detection unit are positioned in the opening, the detection unit detects and sends a detection signal to the control unit, the control unit receives the detection signal and control the motor unit to closes the gate unit. | 11-28-2013 |
20140175902 | DISCHARGE CIRCUIT FOR POWER SUPPLY UNIT - A discharge circuit for a power supply unit includes a pulse width modulator (PWM) chip, a first and second electronic switch, and a resistor. The first electronic switch receives a power good signal from the power supply unit. When a system power terminal outputs a voltage later than a stand-by power terminal, a voltage creep outputted by the PWM chip is discharged through the resistor and the second electronic switch. | 06-26-2014 |
20140175903 | DISCHARGE CIRCUIT FOR POWER SUPPLY UNIT - A discharge circuit includes a pulse width modulator (PWM) chip, a first and second electronic switch, and a resistor. The first electronic switch receives a voltage creep from the PWM chip. When the voltage creep is less than a voltage making the first electronic switch to turned on, the voltage creep is discharged through the resistor and the second electronic switch. | 06-26-2014 |
20140176114 | TIME SEQUENCE CIRCUIT FOR POWER SUPPLY UNIT - A time sequence circuit for a power supply unit includes first through tenth resistors, first and second electronic switches, first through fourth diodes, and a capacitor. Each of the first and second electronic switches includes first through third terminals. When the power supply unit outputs all voltages, the power supply unit outputs a high-voltage level power good signal. If one of the voltages is not outputted, the power supply unit outputs a low-voltage level power good signal. | 06-26-2014 |
20140177297 | POWER SUPPLY CIRCUIT - A power supply circuit preventing any overvoltage to an electronic element includes a voltage conversion unit and a voltage clamping unit. The voltage conversion unit converts voltage of a power supply into an operation voltage of the electronic element, and outputs the converted voltage through an output terminal of the voltage conversion unit. When the voltage output from the output terminal of the voltage conversion unit is more than the operation voltage of the electronic element, the voltage clamping unit effectively clamps the voltage output from the output terminal of the voltage conversion unit down to the operation voltage of the electronic element. | 06-26-2014 |
20140184126 | FAN CONTROL CIRCUIT - A fan control circuit includes a hardware controller, a rectifier circuit, first to third electronic switches, and a fan. When the hardware controller outputs a pulse width modulation (PWM) signal to the rectifier circuit and the fan, the rectifier circuit transforms the PWM signal into a direct current (DC) voltage and outputs the DC voltage to the first electronic switch. The first electronic switch is turned on, and the second and third electronic switches are turned off. A rotation speed of the fan is controlled by the PWM signal received from the hardware controller. When the hardware controller does not output the PWM signal, the first electronic switch is turned off, the second and third electronic switches are turned on, a DC power supply supplies power to the fan through the third electronic switch, and the fan rotates at full speed. | 07-03-2014 |
20140184181 | POWER GOOD SIGNAL GENERATION CIRCUIT - A power good signal generation circuit includes first and second resistors, a comparator, and first and second electronic switches. A power source is grounded through the first and second resistors. A non-inverting input of the comparator is connected to a power circuit. An inverting input of the comparator is connected between the first and second resistors. The comparator output controls the first electronic switch and the first electronic switch controls the operation of the second electronic switch. When the power circuit is operating properly, the power good signal generation circuit outputs a high level signal indicating power good, but when the power circuit is not operating properly a low level signal indicating power not good is output. | 07-03-2014 |
20140184265 | TEST CIRCUIT FOR POWER SUPPLY UNIT - A test circuit includes a power supply unit, a number of resistors, a switch, and a number of light-emitting diodes (LEDs). A first pin of the power supply unit is coupled to the switch. A second pin of the power supply unit is coupled to a system power terminal The first system power terminal is coupled to an anode of a first LED through a first resistor. A cathode of the first LED is grounded. When the switch is turned on, the power supply unit receives a power-on signal through the first pin. If the power supply unit is qualified, the first LED emits light. | 07-03-2014 |
20140184283 | TIME SEQUENCE CIRCUIT FOR POWER SUPPLY UNIT - A time sequencing circuit for a power supply unit to ensure the correct sequencing of system voltages for a computer from a power supply unit includes first to ninth resistors, first to fifth electronic switches, and a capacitor. Each of the first to fifth electronic switches includes first to third terminals. When the power supply unit outputs all required voltages, the power supply unit outputs a high-voltage level indicating power good and the computer can start up. If any one of the required voltages is not being outputted, the power supply unit outputs a low-voltage level good signal until any non-output of voltage is cured. | 07-03-2014 |
20140185173 | PROTECTION CIRCUIT FOR CENTRAL PROCESSING UNIT - A protection circuit for a central processing unit (CPU) includes a power circuit, two comparators, a number of resistors, a thermistor, and an electronic switch. A non-inverting input terminal of the comparator is coupled to a first power terminal. An inverting input terminal of the comparator is connected to ground through the thermistor. An output terminal of the comparator is coupled to the electronic switch. When an operation temperature of the CPU exceeds a predefined temperature, the comparator enables the electronic switch to be turned on, to reduce an operation frequency of the CPU. | 07-03-2014 |
20140187078 | ELECTRONIC DEVICE AND CONNECTOR DETECTION CIRCUIT THEREOF - A connector detection circuit is used for detecting whether a first connector of an electronic device is in sufficient connection with a second connector of a connection device. The connector detection circuit includes a pressure sensing module, a switch unit, and an indicator. The pressure sensing module is located under the pins of the first connector, to sense whether there is pressure applied on each pin of the first connector by a corresponding pin of the second connector, and to output sensed results. The switch unit is connected to the pressure sensing module to receive the sensed results, and is connected to the indicator to control the indicator to indicate whether the first connector and the second connector have a sufficient connection with each other according to the sensed results. | 07-03-2014 |
20140189412 | TIME SEQUENCE CIRCUIT FOR POWER SUPPLY UNIT - A time sequencing circuit for a power supply unit to ensure the correct sequencing of system voltages for a computer from a power supply unit includes first to fifth resistors, an electronic switch, first to third comparators, and a capacitor. Each of the first to third comparators includes an inverting input terminal, a non-inverting input terminal, and an output terminal When the power supply unit outputs all required voltages, the power supply unit outputs a high-voltage level indicating power good and the computer can start up power good signal. If one of the voltages is not outputted, the power supply unit outputs a low-voltage level good signal until any non-output of voltage is cured. | 07-03-2014 |
20140217890 | HANDHELD DEVICE AND POWER SUPPLY CIRCUIT THEREOF - A handheld device includes a backlight driving unit and a power supply circuit for powering the backlight driving unit. The power supply circuit includes a power management unit, a battery, a first electronic switch, a second electronic switch, and a control unit. When a voltage of a second terminal of the second electronic switch is less than a reference voltage of the control unit, the control unit turns on the first electronic switch and turns off the second electronic switch. The backlight driving unit is powered by the battery through the first electronic switch. When the voltage of the second terminal of the second electronic switch is more than the reference voltage of the control unit, the control unit turns off the first electronic switch and turns on the second electronic switch. The backlight driving unit is powered by the PMU through the second electronic switch. | 08-07-2014 |
20140218047 | LOAD-TESTING CIRCUIT FOR USB PORTS - A load-testing circuit is used for simulating maximum standard load currents for different types of USB ports. The load-testing circuit includes a first electronic switch, a second electronic switch, and a current selection module including a plurality of current branch circuits. When one of the current branch circuits is activated, a voltage at a third terminal of the first electronic switch is supplied to a first terminal of the second electronic switch through the activated current branch circuit to turn on the second electronic switch. A current of the third terminal of the first electronic switch is approximately equal to a current of the activated current branch circuit. | 08-07-2014 |
20140253022 | CHARGE CIRCUIT - A charge circuit includes a comparator, first through third electronic switches, first through tenth resistors. A voltage for charging a battery is output to an output of the charge circuit. The output of the charge circuit is grounded through the first and second resistors in that order. A node between the first and second resistors is electrically connected to a non-inverting input terminal of the comparator. An inverting input terminal of the comparator is electrically connected to an anode of the battery. An output terminal of the comparator is electrically connected to the first and third electronic switches. The first electronic switch is electrically connected to the second electronic switch. The second and third electronic switches are selectively turned on according to a voltage of the anode of the battery to change a charging current to the battery. | 09-11-2014 |
20140265630 | PHASE DETECTION CIRCUIT - A phase detection circuit includes first to third power input modules, first to third power input terminals, an alarm module, first to fifth electronic switches, and a power management module. The power input modules are used to convert pulse signals from a multi-phase power supply into direct current voltages and output the direct current voltages to the first to third electronic switches. When the multi-phase power supply operates abnormally, no direct current voltages are output to the first to third electronic switches and the alarm module alarms. | 09-18-2014 |
20140268466 | POWER PROTECTION CIRCUIT - A power protection circuit includes a power source, a first voltage division module, a second voltage division module, a comparison module, an electronic switch, and a power module. The first voltage division module divides a voltage from the power source and outputs a first voltage. The second voltage division module divides the voltage from the power source and outputs a second voltage. The second voltage has a negative temperature coefficient. A temperature of the second voltage division module increases when a temperature of the power module increases. The comparison module is used to compare the first voltage to the second voltage and output first or second signals corresponding to the comparing result. The electronic switch is turned on or off when the electronic switch receives the first or second signals from the comparison module. | 09-18-2014 |
20140285244 | POWER-ON CIRCUIT - A power-on circuit is connected to a video graphics array (VGA) connector of a display, a power supply unit (PSU), and a super input output (SIO) chip of a motherboard. The power-on circuit includes first to fourth electronic switches. The VGA connector is connected to the first electronic switch. The first electronic switch is connected to the second electronic switch. The second electronic switch is respectively connected to the third electronic switch and the fourth electronic switch. The fourth electronic switch is connected to the SIO chip. The power-on circuit could power on the motherboard via the power button on the display. | 09-25-2014 |
20140292257 | ELECTRONIC DEVICE AND CHARGING CIRCUIT THEREOF - A charging circuit is used to charge a rechargeable battery. The charging circuit includes a control unit, a voltage conversion unit, and a charging and display unit. The control unit is used to control the voltage conversion unit to operate. The voltage conversion unit is used to convert a voltage of a power supply into a charging voltage of the rechargeable battery, and output the charging voltage to the charging and display unit. When the voltage conversion unit outputs the charging voltage, the charging and display unit charges the rechargeable battery with the charging voltage. When the voltage conversion unit does not output the charging voltage, the charging and display unit prevents a leakage of the rechargeable battery. The charging and display unit is also used to display a charging state of the rechargeable battery. | 10-02-2014 |
20140292258 | ELECTRONIC DEVICE AND CHARGING CIRCUIT THEREOF - A charging circuit is used to charge a rechargeable battery. The charging circuit includes a voltage conversion unit and a diode. The voltage conversion unit is electrically connected to an anode of the diode. A cathode of the diode is electrically connected to a positive terminal of the rechargeable battery. A negative terminal of the rechargeable battery is grounded. The voltage conversion unit is used to convert a voltage of a power supply into an operation voltage, and output the operation voltage to the diode. When the voltage conversion unit outputs the operation voltage, the diode is turned on. The operation voltage is reduced by the diode into a charging voltage of the rechargeable battery, and the rechargeable battery is charged by the charging voltage. When the voltage conversion unit does not output the charging voltage, the diode is turned off to prevent leakage of the rechargeable battery. | 10-02-2014 |
20140298055 | ENERGY SAVING CIRCUIT OF COMPUTER - An energy saving circuit of a computer is connected between a power supply and a motherboard. The energy saving circuit includes first to fifth electronic switches and a sensor. When the computer is in a stand-by state and the sensor senses a person nearby, the motherboard of the computer receives a standby voltage and the motherboard maintains the stand-by state. When the sensor senses no one nearby, the motherboard does not receive the standby voltage and the motherboard is placed in a power off state. | 10-02-2014 |
20140300999 | EXCESS POWER PROTECTION CIRCUIT - A protection circuit against excess power includes a power supply, a converter, a voltage divider, a comparison module, and a switch. The converter converts a first input voltage from the power supply into a first output voltage. The voltage divider divides the first output voltage into a first divided voltage. Using negative-coefficient thermistors as resistances, the first divided voltage increases when a temperature around the voltage divider increases. The comparison module compares the first divided voltage to a preset voltage and outputs a first or a second signal corresponding to the result of the comparison. The switch allows the power supply to continue operating or to shut down according to the first or to the second signal. | 10-09-2014 |
20140306536 | POWER SUPPLY CIRCUIT - Power supply circuit comprises an under voltage protection module and a voltage conversion module electrically connected to the under voltage protection module. The under voltage protection module is electrically connected to a first power supply and a second power supply. The voltage conversion module is connected to the first power supply. When a voltage of the first power supply is in a normal range, the under voltage protection module offers the second power supply to power the voltage conversion module. The voltage conversion module converts the voltage of the first power supply into an operational voltage, and outputs the operational voltage. When the voltage of the first power supply is less than a threshold voltage, the under voltage protection module does not offer the second power supply to the voltage conversion module, and the voltage conversion module does not operate. | 10-16-2014 |
20140306685 | SEQUENCE CIRCUIT - A sequence circuit includes a power output terminal, first to third power input terminals, first to sixth resistors, first to tenth filed effect transistors (FETs), first to third inductors, a first capacitor, a second capacitor, and first to third drivers. The sequence circuit ensures that different voltages work in a correct sequence. | 10-16-2014 |
20140307352 | OVERVOLTAGE PROTECTION CIRCUIT - An overvoltage protection circuit includes a first connector connected to an alternating current (AC) power source, a second connector connected to an electronic device, an alternating current to direct current (AC/DC) rectifying circuit, a voltage regulating diode, a relay, a first electronic switch, and a second electronic switch. The first connector is connected to the AC/DC rectifying circuit. The AC/DC rectifying circuit is connected to the first electronic switch through the voltage regulating diode. The first electronic switch is connected to the second electronic switch. The second electronic switch is connected to the relay. The first connector is connected to the second connector through the relay. | 10-16-2014 |
20140313038 | DETECTION DEVICE - A detection device includes a detection circuit and a temperature measuring device. The detection circuit is used to detect an electronic component causing a short circuit in a circuit module and includes a power source, a light emitting diode (LED), a first connecting terminal connected to a cathode of the LED, and a second connecting terminal An anode of the LED is connected to an anode terminal of the power source. The first connecting terminal and the second connecting terminal are connected the first node and the second node, respectively. The temperature measuring device includes a number of test terminals for contacting the electronic components to measure and show temperatures of the electronic components. If a short circuit occurs, the LED is turned on. The short circuited electronic component is identified by reading the temperatures of the test terminals. | 10-23-2014 |
20140313620 | VOLTAGE PROTECTION CIRCUIT - Voltage protection circuit connected between a current protection circuit and a load. The voltage protection circuit includes a comparator, an inverter, and an electronic switch. The current protection circuit is connected between the load and a power supply circuit for protecting the load from over-current. When an output voltage of the power supply circuit is less than a rated voltage of the load, the load receives the output voltage of the power supply circuit as normal. The power supply circuit stops outputting the output voltage to the load for protection, when the output voltage of the power supply circuit is greater than the rated voltage of the load. | 10-23-2014 |
20140313625 | VOLTAGE PROTECTION CIRCUIT - A voltage protection circuit includes a first power source, a power circuit, a comparator, and a electronic switch. The power circuit provides an output voltage to the comparator. The comparator compares the output voltage with a reference voltage. The electronic switch controls the power circuit according to the comparison. When the output voltage is larger than the reference voltage, the electronic switch controls the power circuit to stop providing the output voltage. | 10-23-2014 |
20140317426 | ENERGY SAVING CIRCUIT OF COMPUTER - Energy saving circuit of a computer is connected between a power supply and a motherboard. The energy saving circuit includes six electronic switches and a switch. When the computer is in the stand-by state, and the switch is pressed, the motherboard of the computer receives a standby voltage and the motherboard maintains the stand-by state. The energy-saving circuit can shut off the standby voltage by pressing the switch when the computer is powered off to save energy. | 10-23-2014 |
20140320072 | TIME ADJUSTING CHARGE CIRCUIT - A charge circuit for charging a battery includes a converter and a timer. The converter converts alternating current (AC) of an AC power supply into direct current (DC) and outputs a DC voltage to the battery through a first resistor. The timer is used to set a period of time and stop charging the battery after the set period of time. | 10-30-2014 |
20140320106 | POWER SUPPLY CIRCUIT - A power supply circuit comprises an under voltage protection unit and a voltage conversion unit electrically connected to the under voltage protection unit. The under voltage protection unit and the voltage conversion unit are electrically connected to a power supply. When a voltage of the power supply is in a normal range, the under voltage protection unit outputs a first control signal to the voltage conversion unit. The voltage conversion unit converts the voltage of the power supply into an operation voltage, and outputs the operation voltage. When the voltage of the power supply is less than a threshold voltage, the under voltage protection unit outputs a second control signal to the voltage conversion unit, and the voltage conversion unit does not operate. | 10-30-2014 |
20140321003 | POWER SUPPLY CIRCUIT - Power supply circuit comprises an under voltage protection unit and a voltage conversion unit electrically connected to the under voltage protection unit. The under voltage protection unit comprises a control chip, an npn-type bipolar junction transistor (BJT), a pnp-type BJT, and first fourth resistors. The under voltage protection unit and the voltage conversion unit are electrically connected to a power supply. When a voltage of the power supply is in a normal range, the under voltage protection unit outputs a first control signal to the voltage conversion unit. The voltage conversion unit converts the voltage of the power supply into an operation voltage, and outputs the operation voltage. When the voltage of the power supply is less than a threshold voltage, the under voltage protection unit outputs a second control signal to the voltage conversion unit, and the voltage conversion unit does not operate. | 10-30-2014 |
20140365700 | EXPANSION BOARD FOR MEMORY CARDS - An expansion board that can be inserted into a first memory slot is provided. The expansion board includes a circuit board, a number of second memory slots, a frequency divider, and an edge connector. The second memory slots and the frequency divider are arranged on the circuit board. The edge connector is set on a side of the circuit board to engage in the first memory slot. The second memory slots and the frequency divider are coupled to the edge connector, to communicate with the first memory slot via the edge connector. | 12-11-2014 |
20140376167 | MANAGEMENT DEVICE FOR ELECTRONIC DEVICE - A management device includes a control module, a display module, and an input module. The control module includes a control chip and a detecting unit. The detecting unit is used to receive first signals corresponding to a working status of hard disks and a backplane. The display module is coupled to the control chip to display parameters presenting the working status of the hard disks. The input module is used to input signals to control the display module to display more detailed parameters of the hard disks. | 12-25-2014 |
20150016004 | OVER-CURRENT PROTECTION CIRCUIT - A circuit protecting the components of a power circuit against passing an over-current is connected to an enable terminal of a pulse width modulation (PWM) controller of a power supply circuit on a motherboard, protecting the field effect transistors (FETs) of a first power circuit of the power supply circuit. The protecting circuit includes a first protection circuit. When a current of the first power circuit is increased, the temperatures of the FETs of the first power circuit also increase. The first protection circuit then outputs a low-level signal to the enable terminal of the PWM controller and the PWM controller stops operation thereby protecting the FETs of the first power circuit. | 01-15-2015 |
20150019883 | POWER SUPPLY CIRCUIT FOR CENTRAL PROCESSING UNIT - A power supply circuit for a central processing unit (CPU) includes a comparing circuit, first to third switch circuits, first and second compensation circuits, a pulse width modulation (PWM) controller, a first power circuit connected to a first output pin of the PWM controller, and a second power circuit connected to a second output pin of the PWM controller. When a motherboard operates normally, the comparing circuit outputs a first control signal to control the first and third switch circuits to be turned on. The second switch circuit is turned off. The first compensation circuit provides a compensation signal to the PWM controller. When the motherboard is powered off, the comparing circuit outputs a second control signal to control the first and third switch circuits to be turned off. The second switch circuit is turned on. The second compensation circuit provides a compensation signal to the PWM controller. | 01-15-2015 |
20150028934 | SEQUENCE CIRCUIT - A sequence circuit includes first through third signal terminals, first through ninth resistors, and first through fifth electronic switches. The sequence circuit receives a first signal through the first signal terminal. The sequence circuit receives a second signal through the second signal terminal. The sequence circuit outputs a third signal through the third signal terminal. The sequence circuit is used to ensure the sequence of the first through third signals. | 01-29-2015 |
20150033040 | POWER SUPPLY CIRCUIT FOR CENTRAL PROCESSING UNIT - A power supply circuit for supplying power to a central processing unit (CPU) of a computer includes a pulse width modulation (PWM) controller, a control circuit, a switch circuit, a first current protection circuit, a second current protection circuit, a first power circuit, and a second power circuit. When the computer is turned on, a first current protection threshold is set by the PWM controller through the first current protection circuit. When the computer is in a standby mode, a second current protection threshold is set by the PWM controller through the second current protection circuit. | 01-29-2015 |
20150033041 | POWER SUPPLY CIRCUIT FOR CENTRAL PROCESSING UNIT - A power supply circuit applied to a central processing unit (CPU) of a computer includes a pulse width modulation (PWM) controller, a control circuit, a first switch circuit, a second switch circuit, a first compensation circuit, a second compensation circuit, a first power circuit, and a second power circuit. When the computer is turned on, the PWM controller regulates duty cycles of pulse signals and outputs the regulated pulse signals to the first and second power circuits according to a first compensation signal, to provide a stable voltage to the CPU. When the computer is in a standby mode, the PWM controller regulates duty cycles of pulse signals and outputs the regulated pulse signals to the first power circuit according to a second compensation signal, to provide a stable voltage to the CPU. | 01-29-2015 |