INVENTRONICS (HANGZHOU), INC. Patent applications |
Patent application number | Title | Published |
20150381028 | METHOD AND CIRCUIT FOR REDUCING RIPPLE OF CURRENT OUTPUT BY CURRENT SOURCE - Disclosed are a method and circuit for reducing a ripple of a current output by a current source. The circuit for reducing a ripple of a current output by a current source comprises a tube with adjustable impedance and a control circuit. The control circuit detects a direct current output by the current source to obtain a first signal which is in proportion to the direct current, and by comparing an instantaneous value of the first signal with an amplitude value of a set signal, controlling the increase of the impedance of the tube with adjustable impedance when the instantaneous value of the first signal is greater than the amplitude value of the set signal, so as to enable the amplitude value of the first signal to not exceed the amplitude value of the set signal and then enable the amplitude value of the current output by the current source to not exceed the amplitude value of the set current of the set signal, so that the purpose of reducing the ripple of the direct current output by the current source is finally achieved. | 12-31-2015 |
20150372588 | CONTROL CIRCUIT IN POWER FACTOR CORRECTION CIRCUIT - A control circuit in a power factor correction (PFC) circuit includes: a multiplier, used for multiplying a voltage sampling signal by a feedback signal, and outputting a first signal; and a waveform generating module, used for generating a second signal related to a filter capacitor connected in parallel to an input end and/or an output end of a rectifier bridge. A control signal for controlling a state of a main switch transistor is generated by using the first signal, the second signal, and a current sampling signal of the main switch transistor in the PFC circuit. | 12-24-2015 |
20150282268 | LED DRIVER, AND METHOD AND DEVICE FOR CONTROLLING FIXED VALUE OF LED DRIVER - Provided in an embodiment of the present invention are an LED driver, and method and device for controlling the fixed value of the LED driver, the method comprising: detecting whether an existing terminal of an LED driver inputs a control signal; when the control signal is detected, determining the fixed value of the LED driver according to the control signal; when the LED driver is an LED driver having no dimming function, the fixed value is the rated current of the LED driver; when the LED driver is an LED driver having a dimming function, the fixed value includes the upper limit or lower limit of the output current value of the LED driver. The method, device and the LED driver provided in the embodiment of the present invention can save LED driver costs. | 10-01-2015 |
20140246987 | CONSTANT CURRENT DRIVE FOR LED LIGHT SOURCE - Disclosed is a constant current drive for an LED light source, including a main power supply loop and at least one backup power supply loop. The main power supply loop at least includes a power conversion circuit. The power conversion circuit outputs a constant current to an LED light source. The backup power supply loop at least includes a power conversion backup circuit. The power conversion backup circuit outputs a constant current to the LED light source. When the power conversion circuit and the power conversion backup circuit operate normally, any one thereof operates in a nominal state or a derating state, and the output ends thereof are connected in parallel and then supply power to the LED light source simultaneously. When any one of the power conversion circuit and the power conversion backup circuit is invalid, the invalid circuit will not affect the normal operation of the remaining circuit. The constant current drive for an LED light source in the present invention can improve the reliability of the constant current drive for an LED light source due to having a backup power supply loop. | 09-04-2014 |
20140191670 | CIRCUIT FOR ADJUSTING LED CURRENT - Provided is a circuit for adjusting light-emitting diode (LED) current; the circuit comprises: a single-output constant current source ( | 07-10-2014 |
20140021875 | AUXILIARY POWER SUPPLY CIRCUIT OF TWO WIRE DIMMER - An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor ( | 01-23-2014 |
20130285625 | LOAD DRIVING DEVICE AND SYSTEM, LIMITING POINT CONTROL METHOD AND DEVICE - A load driving device and system, and a limiting point control method and device. The load driving device comprising: a voltage/current regulative main circuit placed under the control of an output current controller, for use in conducting a voltage conversion on an input voltage, and in supplying electric power to a subsequent load unit; a sampling unit connected to an output terminal of the main circuit, for use in sampling an output feature parameter of the main circuit; the output current controller, for use in controlling a limiting point of the main circuit, and on the basis of the adjustment direction of the limiting point and on changes of the output feature parameters of the main circuit before and after an adjustment, determining a steady working point for the main circuit, and controlling the main circuit to work at the steady working point. The load driving device and system enable an increase in driver reliability and a reduction in circuit complexity. | 10-31-2013 |
20130271032 | DEVICE AND SYSTEM FOR LOAD DRIVING - A device and system for load driving. The device includes: an electric energy supplying unit including at least two units with output voltage adjustable; a sampling unit, with the input thereof connected to either end of a load unit for sampling the current of that end and sending the sampled current to an output voltage controller; the output voltage controller, with the input thereof connected to the output of the sampling unit for outputting voltage control signal to each unit with output voltage adjustable, according to the sampled current, so as to control the difference between the output voltage of each unit with output voltage adjustable and the maximum load voltage in a load branch to be not greater than a preset difference threshold, with the difference threshold being greater than or equal to zero. The device and system for load driving can improve the reliability of the driving device and can reduce the complexity of the circuit. | 10-17-2013 |
20130241433 | METHOD, APPARATUS AND SYSTEM FOR CONTROLLING LIGHT SOURCE - Provided are a method, apparatus and system for controlling a light source. The method comprises: acquiring an adjustment signal and determining a dimming item according to the adjustment signal; the dimming item being composed of the value and/or value range of at least one characteristics parameter of a pulse drive signal; converting the adjustment signal into the pulse drive signal indicated by the dimming item; controlling an adjustment switch by means of the pulse drive signal, so as to output a voltage including a chopped wave voltage corresponding to the dimming item, thereby transmitting adjustment information about the colour and/or brightness of the light source by means of the voltage including the chopped wave voltage. The method, apparatus and system can achieve the function of adjusting the colour and/or brightness of the light source. | 09-19-2013 |
20130154482 | OPEN-CIRCUIT PROTECTION CIRCUIT OF CONSTANT CURRENT DRIVING CIRCUIT FOR LIGHT EMITTING DIODES - A open-circuit protection circuit of a constant current driving circuit for light emitting diodes is disclosed, which includes that: a transformer (Ta | 06-20-2013 |
20130127343 | POWER SUPPLY CIRCUIT FOR MULTI-PATH LIGHT-EMITTING DIODE (LED) LOADS - The present invention discloses a power supply circuit for multi-path light-emitting diode (LED) loads. The two ports of the second diode are connected in parallel with the first switch tube, and the two ports of the forth diode are connected in parallel with the second switch tube. The conduction mode of the second and forth diodes is controlled by controlling the switch status of the first and second switch tubes. When the system is on a normal state, the first and second switch tubes are both switched off. When the load output of any path needs to be turned off, the corresponding switch tube should be controlled to switch on, which makes the diode connected in parallel with the switch tube short-circuited. The present invention can avoid a strong impulse current produced in filtering capacitor when the load of any path is directly short-circuited. Therefore, the present invention can reduce the current stress in circuits, improve the reliability of circuits, and reduce the cost. | 05-23-2013 |
20130099686 | LIGHT EMITTING DIODE (LED) DIMMING SYSTEM - A Light emitting diode (LED) dimming system comprises a voltage regulating converter, an input of which is connected to a power supply; a constant current module, an output of which is connected to an LED load constituted by one LED light or multiple serial LED lights; the output of the voltage regulating converter is connected with the input of the constant current module via a switch, and the switch is controlled to be on-off by an adjustable pulse signal. The invention has the advantages of high power factor and low electromagnetic interference, and easy implementation, etc. | 04-25-2013 |
20130093348 | METHOD, APPARATUS AND SYSTEM FOR CONTROLLING LIGHT SOURCE - A method, an apparatus and a system for controlling a light source are disclosed. The method comprises: receiving a dimming command, determining the dimming item specified by the dimming command ( | 04-18-2013 |
20130088169 | CONSTANT-CURRENT LED DRIVER CIRCUIT AND OUTPUT VOLTAGE ADJUSTABLE CIRCUIT AND METHOD THEREOF - A constant-current Light Emitting Diode (LED) driver circuit is provided, and the circuit includes: an output voltage adjustable circuit and at least one path of LED load, wherein the output voltage adjustable circuit comprises: a switch converting main circuit, an output characteristic parameter sampling circuit, and an output voltage controller. The output voltage controller is used to adjust the output voltage of the switch converting main circuit according to the variation relationship between the sampling signal output by the output characteristic parameter sampling circuit and the output voltage, determine the adjustive direction of the output voltage magnitude of the switch converting main circuit according to the change of the sampling signal, adjust the magnitude of the output voltage of the switch converting main circuit according to the preset step, and finally make the output voltage equal to the voltage of one path of LED load with the highest voltage or the difference between the output voltage and the voltage of one path of LED load voltage with the highest voltage within the predetermined range. The present solution implements reducing the connection complexity and power dissipation on the base of controlling the multi-path constant-current LED. | 04-11-2013 |