CN110324935B - Efficient linear LED driving circuit and method - Google Patents
Efficient linear LED driving circuit and method Download PDFInfo
- Publication number
- CN110324935B CN110324935B CN201910533512.7A CN201910533512A CN110324935B CN 110324935 B CN110324935 B CN 110324935B CN 201910533512 A CN201910533512 A CN 201910533512A CN 110324935 B CN110324935 B CN 110324935B
- Authority
- CN
- China
- Prior art keywords
- reference signal
- current
- current source
- linear
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 238000013459 approach Methods 0.000 claims abstract description 7
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 6
- 239000010703 silicon Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The invention discloses a high-efficiency linear LED driving circuit and a method, comprising a linear regulating tube and a control circuit, wherein an alternating current input power supply is rectified by a rectifying circuit to obtain input voltage, the linear regulating tube is connected with an LED load in series, the input voltage supplies power to the LED load, and the control circuit is connected with a control end of the linear regulating tube; the control circuit adjusts the current flowing through the linear adjusting tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal; and in a half power frequency period, when current starts to flow from the linear regulating tube, the current reference signal is opposite to the change trend of the input voltage, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a fixed value reference signal. The invention can be compatible with the application of the silicon controlled rectifier dimming, and meets the requirement of the silicon controlled rectifier on maintaining current.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a high-efficiency linear LED driving circuit and method.
Background
The linear LED driving circuit in the prior art comprises a rectifying circuit, a linear regulating tube and a control circuit for controlling the linear regulating tube. The control circuit performs error processing on the current flowing through the linear regulating tube and the corresponding current reference value through sampling so as to control the state of the linear regulating tube, thereby realizing output constant current.
The input voltage VIN is sinusoidal, and the closer to the peak position of the voltage VIN waveform, the larger the voltage difference between the voltage VIN and the voltage VLED across the LED load is in the power frequency period. The power consumption on the linear regulator M01 is (VIN-VLED) ×iout, i.e., the greater the voltage VIN is than the voltage VLED across the LED, the greater the power consumption on the linear regulator M01, the lower the system efficiency.
In order to improve the efficiency of the linear LED driving circuit, the current flowing through the LED may be compensated according to the waveform of the input voltage, so that the current flowing through the LED load takes a concave shape to improve the driving efficiency of the LED. As shown in fig. 1, the operating waveform of the high-efficiency linear LED driving circuit under normal conditions is illustrated, where Input Voltage is Input Voltage, LED current is current flowing through the LED, ITRACIC _hold is thyristor holding current, and since the compensation for the current flowing through the LED is according to the change of the Input Voltage, the higher the Input Voltage is, the lower the current flowing through the LED is. In the triac dimming application, the current through the LED needs to be greater than the holding current of the triac dimmer. In the above case, if the output current is lower than the holding current of the scr dimmer, the normal operation of the scr dimmer is affected, as shown in fig. 3. In addition, during over-temperature protection, the over-temperature protection function can reduce the LED current as a whole, which is more likely to cause the LED current to be lower than the holding current of the scr dimmer, as shown in fig. 2.
Disclosure of Invention
Therefore, the present invention is directed to a high-efficiency linear LED driving circuit and method compatible with thyristor dimming, which are used for solving the technical problem that the load current is lower than the thyristor maintaining current in the prior art.
The technical scheme of the invention is that the high-efficiency linear LED driving circuit with the following structure comprises a linear regulating tube and a control circuit, wherein an alternating current input power supply is rectified by a rectifying circuit to obtain input voltage, the linear regulating tube is connected with an LED load in series, the input voltage supplies power to the LED load, and the control circuit is connected with a control end of the linear regulating tube;
the method comprises the steps that current flowing through a linear regulation tube is sampled to obtain a first voltage sampling signal representing output current, the control circuit receives the first voltage sampling signal and a current reference signal, and the control circuit regulates the current flowing through the linear regulation tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal;
and in a half power frequency period, when current flows from the linear regulating tube, the current reference signal has opposite variation trend with the input voltage or has small middle and large two sides, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a constant reference signal.
Optionally, the control circuit includes a reference signal generating circuit, where the reference signal generating circuit receives a first reference signal, a compensation reference signal and a constant value reference signal, where the compensation reference signal is the same as the input voltage variation trend, the first reference signal and the compensation reference signal are differentially superimposed to obtain a second reference signal, when the current reference signal is higher than a minimum reference threshold, the current reference signal is the second reference signal or a sum of the second reference signal and the constant value reference signal, and when the current reference signal is lower than the minimum reference threshold, the current reference signal is the constant value reference signal.
Optionally, the reference signal generating circuit includes a first current source, a second current source, a third current source and a first resistor, where the first current source, the second current source and the third current source are all connected with the first resistor, a voltage drop generated by the first current source on the first resistor is used to represent the first reference signal, a voltage drop generated by the second current source on the first resistor is opposite to the first current source, a voltage drop generated by the second current source on the first resistor represents the compensation reference signal, and a voltage drop generated by the third current source on the first resistor represents the constant value reference signal.
Optionally, the reference signal generating circuit further includes a unidirectional conduction element, a first end of the unidirectional conduction element is connected to the first current source and the second current source, and a second end of the unidirectional conduction element is connected to the first resistor and the third current source.
Optionally, the compensation reference signal is proportional to the input voltage or the voltage at one end of the load.
The invention provides another technical scheme that the high-efficiency linear LED driving method comprises the steps that an alternating-current input power supply is rectified by a rectifying circuit to obtain input voltage, a linear regulating tube is connected with an LED load in series, the input voltage supplies power to the LED load, and a control circuit is connected with a control end of the linear regulating tube;
the method comprises the steps that current flowing through a linear regulation tube is sampled to obtain a first voltage sampling signal representing output current, the control circuit receives the first voltage sampling signal and a current reference signal, and the control circuit regulates the current flowing through the linear regulation tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal;
and in a half power frequency period, when current flows from the linear regulating tube, the current reference signal has opposite variation trend with the input voltage or has small middle and large two sides, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a constant reference signal.
Optionally, the control circuit includes a reference signal generating circuit, where the reference signal generating circuit receives a first reference signal, a compensation reference signal and a constant value reference signal, where the compensation reference signal is the same as the input voltage variation trend, the first reference signal and the compensation reference signal are differentially superimposed to obtain a second reference signal, when the current reference signal is higher than a minimum reference threshold, the current reference signal is the second reference signal or a sum of the second reference signal and the constant value reference signal, and when the current reference signal is lower than the minimum reference threshold, the current reference signal is the constant value reference signal.
Compared with the prior art, the invention has the following advantages: by adopting the invention, the output current flowing through the load and the input voltage have opposite change trend so as to realize the linear and efficient driving of the LED, when the current reference signal is lower than the minimum reference threshold, namely the output current is lower than the corresponding threshold, the current reference signal is clamped to the fixed value reference signal, so that the output current flowing through the load is in a fixed value meeting the condition of the thyristor maintaining current, and the fixed value can be set according to the fixed value reference signal. The invention can be compatible with the application of the silicon controlled rectifier dimming, meets the requirement of the silicon controlled rectifier on maintaining current, and improves the reliability of the circuit.
Drawings
FIG. 1 is a normal waveform diagram of a prior art LED driver circuit;
FIG. 2 is a waveform diagram of a prior art LED driver circuit under over-temperature protection;
FIG. 3 is a waveform diagram of a prior art LED driver circuit with a large input voltage;
FIG. 4 is a normal waveform diagram of the high efficiency linear LED driving circuit of the present invention;
FIG. 5 is a waveform diagram of the high efficiency linear LED driving circuit of the present invention under over-temperature protection;
FIG. 6 is a waveform diagram of the high efficiency linear LED driving circuit of the present invention with a large input voltage;
FIG. 7 is a schematic diagram of a high efficiency linear LED driving circuit according to the present invention;
fig. 8 is a schematic diagram of a reference signal generating circuit.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention.
The basic implementation scheme of the invention is as follows: the high-efficiency linear LED driving circuit comprises a linear regulating tube and a control circuit, wherein an alternating current input power supply is rectified by a rectifying circuit to obtain input voltage, the linear regulating tube is connected with an LED load in series, the input voltage supplies power to the LED load, and the control circuit is connected with a control end of the linear regulating tube;
the method comprises the steps that current flowing through a linear regulation tube is sampled to obtain a first voltage sampling signal representing output current, the control circuit receives the first voltage sampling signal and a current reference signal, and the control circuit regulates the current flowing through the linear regulation tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal;
and in a half power frequency period, when current starts to flow from the linear regulating tube, the current reference signal is opposite to the change trend of the input voltage, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a fixed value reference signal.
Based on the basic implementation scheme, the detailed description is given by adopting specific embodiments.
Referring to fig. 4-6, the operating waveforms of the high efficiency linear LED driving circuit under normal conditions, when the input voltage is large, and when over-temperature protection are illustrated, respectively. Where Input Voltage is the Input Voltage, LED current is the current through the LED, ITRACIC _hold is the thyristor HOLD current, iled_min is the minimum current through the LED. The minimum current iled_min is greater than the thyristor HOLD current ITRACIC _hold, which is determined by the constant reference signal. The waveform of the LED current coincides with the waveform of the current reference signal. As shown in fig. 4, under normal conditions, the current reference signal is generally not lower than the minimum reference threshold, so the current LED current flowing through the LED is greater than the thyristor holding current ITRACIC _hold, and therefore, does not affect the operation of the thyristor dimmer. As shown in fig. 5, in the case of over-temperature protection, the current flowing through the LED is reduced as a whole, and at this time, the lowest part of the LED current may be lower than the thyristor holding current ITRACIC _hold, and once the current reference signal is lower than the minimum reference threshold value, the current reference signal is clamped to a constant value reference signal, that is, the current flowing through the LED is clamped to the minimum current iled_min. As shown in fig. 6, when the input voltage is large, the compensation amount for the LED current is also increased, and at this time, the lowest part of the LED current may be lower than the thyristor holding current ITRACIC _hold, and once the current reference signal is lower than the minimum reference threshold value, the current reference signal is clamped to a constant value reference signal, that is, the current flowing through the LED is clamped to the minimum current iled_min. The above is only a case of large input voltage and over-temperature protection, but the present invention is not limited to these two cases, and the current can be clamped to the minimum current iled_min in the case that other conditions occur that may cause the LED current to be lower than the thyristor holding current.
Referring to fig. 7, the basic circuit structure of the present invention is illustrated. The high-efficiency linear LED driving circuit comprises a linear regulating tube M01 and a control circuit, wherein an alternating current input power supply is rectified by the rectifying circuit to obtain input voltage, the linear regulating tube M01 is connected with an LED load in series, the input voltage supplies power to the LED load, and the control circuit is connected with the control end of the linear regulating tube M01; in the silicon controlled rectifier dimming scheme, a silicon controlled rectifier dimmer is arranged between an alternating current input power supply and a rectifying circuit;
Sampling the current flowing through the linear regulation tube M01 to obtain a first voltage sampling signal VS representing output current, wherein the control circuit receives the first voltage sampling signal VS and a current reference signal VREF, and adjusts the current flowing through the linear regulation tube according to the first voltage sampling signal VS and the current reference signal VREF so that the first voltage sampling signal VS approaches to the current reference signal VREF;
And in a half power frequency period, when current flows from the linear regulating tube, the current reference signal is opposite to the change trend of the input voltage or is small in the middle and big in two sides, and when the current reference signal VREF is lower than a minimum reference threshold value, the current reference signal is clamped to a fixed value reference signal. The current reference signal is smaller in middle and larger in two sides, namely three sections, namely a first section, a second section and a third section, the current reference signal in the second section is smaller than the current reference signals in the first section and the third section, and the current reference signals in the first section and the third section are equal.
The specific implementation circuit is further described by the fact that the current reference signal and the change trend of the input voltage are opposite, the control circuit comprises a reference signal generating circuit, the reference signal generating circuit receives a first reference signal VREF1, a compensation reference signal VREF2 and a fixed value reference signal VREF3, the compensation reference signal VREF2 and the change trend of the input voltage are the same, the first reference signal VREF1 and the compensation reference signal VREF2 are subjected to difference superposition to obtain a second reference signal, when the current reference signal is higher than a minimum reference threshold value, the current reference signal is the sum of the second reference signal or the second reference signal and the fixed value reference signal, and when the current reference signal is lower than the minimum reference threshold value, the current reference signal is the fixed value reference signal VREF3.
The reference signal generating circuit comprises a first current source I1, a second current source I2, a third current source I3 and a first resistor R1, wherein the first current source I1, the second current source I2 and the third current source I3 are all connected with the first resistor R1, the voltage drop generated by the first current source I1 on the first resistor R1 is used for representing the first reference signal, the voltage drop generated by the second current source I2 on the first resistor R1 is opposite to the direction of the first current source I1 and represents the compensation reference signal, and the voltage drop generated by the third current source I3 on the first resistor is used for representing the constant value reference signal.
The reference signal generating circuit further comprises a unidirectional conduction element, a first end of the unidirectional conduction element is connected with the first current source I1 and the second current source I2, and a second end of the unidirectional conduction element is connected with the first resistor R1 and the third current source I3.
The compensation reference signal is proportional to the input voltage or the voltage at one end of the load.
The first reference signal VREF 1=i1×r1, the compensation reference signal VREF 2=i2×r1, and the constant reference signal VREF 3=i3×r1. The first current source I1 and the third current source I3 are constant current sources, and in this embodiment, under normal conditions:
Vref=vref 1-VREF2+ VREF3, the waveform of which has an opposite variation trend with the input voltage;
when VREF 1+.vref 2, the current reference signal VREF clamp is located at the constant reference signal VREF3, in this embodiment, vref=vref 3 when VREF 1+.vref 2 is due to the blocking of the unidirectional conductive element.
The above is only one embodiment, and other embodiments may be used, for example, the current reference signal VREF is directly compared with a minimum reference threshold, and when the current reference signal VREF is lower or lower than the minimum reference threshold, the current reference signal VREF is switched to a fixed value reference signal by a switch.
Although the embodiments have been described and illustrated separately above, and with respect to a partially common technique, it will be apparent to those skilled in the art that alternate and integration may be made between embodiments, with reference to one embodiment not explicitly described, and reference may be made to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (4)
1. The utility model provides a high-efficient linear LED drive circuit, includes linear regulation pipe and control circuit, obtains input voltage after alternating current input power supply rectifies through rectifier circuit, linear regulation pipe is established ties with the LED load, input voltage supply to the LED load, control circuit with the control end of linear regulation pipe is connected, its characterized in that:
the method comprises the steps that current flowing through a linear regulation tube is sampled to obtain a first voltage sampling signal representing output current, the control circuit receives the first voltage sampling signal and a current reference signal, and the control circuit regulates the current flowing through the linear regulation tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal;
When current starts to flow from the linear regulating tube in a half power frequency period, the current reference signal has opposite variation trend with the input voltage or has small middle and large two sides, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a constant value reference signal;
The control circuit comprises a reference signal generation circuit, wherein the reference signal generation circuit receives a first reference signal, a compensation reference signal and a constant value reference signal, the compensation reference signal is the same as the input voltage change trend, the first reference signal and the compensation reference signal are subjected to difference superposition to obtain a second reference signal, when the current reference signal is higher than a minimum reference threshold value, the current reference signal is the sum of the second reference signal or the second reference signal and the constant value reference signal, and when the current reference signal is lower than the minimum reference threshold value, the current reference signal is the constant value reference signal;
the reference signal generating circuit comprises a first current source, a second current source, a third current source and a first resistor, wherein the first current source, the second current source and the third current source are all connected with the first resistor, the voltage drop generated by the first current source on the first resistor represents the first reference signal, the voltage drop generated by the second current source on the first resistor represents the compensation reference signal, the voltage drop generated by the second current source on the first resistor represents the constant value reference signal, and the voltage drop generated by the third current source on the first resistor is opposite to the first current source.
2. The efficient linear LED driving circuit of claim 1, wherein: the reference signal generating circuit further comprises a unidirectional conduction element, a first end of the unidirectional conduction element is connected with the first current source and the second current source, and a second end of the unidirectional conduction element is connected with the first resistor and the third current source.
3. A high efficiency linear LED driving circuit according to any one of claims 1-2, wherein: the compensation reference signal is proportional to the input voltage or the voltage at one end of the load.
4. The utility model provides a high-efficient linear LED drive method, obtains input voltage after alternating current input power supply rectifies through rectifier circuit, linear regulation pipe and LED load series connection, input voltage supply to the LED load, control circuit with the control end connection of linear regulation pipe, its characterized in that:
the method comprises the steps that current flowing through a linear regulation tube is sampled to obtain a first voltage sampling signal representing output current, the control circuit receives the first voltage sampling signal and a current reference signal, and the control circuit regulates the current flowing through the linear regulation tube according to the first voltage sampling signal and the current reference signal so that the first voltage sampling signal approaches to the current reference signal;
When current starts to flow from the linear regulating tube in a half power frequency period, the current reference signal has opposite variation trend with the input voltage or has small middle and large two sides, and when the current reference signal is lower than a minimum reference threshold value, the current reference signal is clamped to a constant value reference signal;
The control circuit comprises a reference signal generation circuit, wherein the reference signal generation circuit receives a first reference signal, a compensation reference signal and a constant value reference signal, the compensation reference signal is the same as the input voltage change trend, the first reference signal and the compensation reference signal are subjected to difference superposition to obtain a second reference signal, when the current reference signal is higher than a minimum reference threshold value, the current reference signal is the sum of the second reference signal or the second reference signal and the constant value reference signal, and when the current reference signal is lower than the minimum reference threshold value, the current reference signal is the constant value reference signal;
the reference signal generating circuit comprises a first current source, a second current source, a third current source and a first resistor, wherein the first current source, the second current source and the third current source are all connected with the first resistor, the voltage drop generated by the first current source on the first resistor represents the first reference signal, the voltage drop generated by the second current source on the first resistor represents the compensation reference signal, the voltage drop generated by the second current source on the first resistor represents the constant value reference signal, and the voltage drop generated by the third current source on the first resistor is opposite to the first current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910533512.7A CN110324935B (en) | 2019-06-19 | 2019-06-19 | Efficient linear LED driving circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910533512.7A CN110324935B (en) | 2019-06-19 | 2019-06-19 | Efficient linear LED driving circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110324935A CN110324935A (en) | 2019-10-11 |
| CN110324935B true CN110324935B (en) | 2024-05-24 |
Family
ID=68119881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910533512.7A Active CN110324935B (en) | 2019-06-19 | 2019-06-19 | Efficient linear LED driving circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110324935B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798939A (en) * | 2019-11-11 | 2020-02-14 | 杰华特微电子（张家港）有限公司 | LED driving circuit and method |
| CN110913532A (en) * | 2019-12-30 | 2020-03-24 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2503850A2 (en) * | 2011-03-22 | 2012-09-26 | Panasonic Corporation | Illumination fixture |
| KR20130077593A (en) * | 2011-12-29 | 2013-07-09 | 서울반도체 주식회사 | LED light emitting device |
| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN108924998A (en) * | 2018-07-09 | 2018-11-30 | 东南大学 | A kind of efficiency optimization system of the linear LED drive circuit of single hop |
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
| CN109392213A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of low-voltage output linear constant current LED driving method |
| CN109526106A (en) * | 2018-12-20 | 2019-03-26 | 厦门市必易微电子技术有限公司 | A kind of driving circuit, LED drive system and current control method |
| CN210405722U (en) * | 2019-06-19 | 2020-04-24 | 杰华特微电子（张家港）有限公司 | High-efficiency linear LED driving circuit |
-
2019
- 2019-06-19 CN CN201910533512.7A patent/CN110324935B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2503850A2 (en) * | 2011-03-22 | 2012-09-26 | Panasonic Corporation | Illumination fixture |
| KR20130077593A (en) * | 2011-12-29 | 2013-07-09 | 서울반도체 주식회사 | LED light emitting device |
| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN109392213A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of low-voltage output linear constant current LED driving method |
| CN108924998A (en) * | 2018-07-09 | 2018-11-30 | 东南大学 | A kind of efficiency optimization system of the linear LED drive circuit of single hop |
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
| CN109526106A (en) * | 2018-12-20 | 2019-03-26 | 厦门市必易微电子技术有限公司 | A kind of driving circuit, LED drive system and current control method |
| CN210405722U (en) * | 2019-06-19 | 2020-04-24 | 杰华特微电子（张家港）有限公司 | High-efficiency linear LED driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110324935A (en) | 2019-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9055629B2 (en) | SCR dimming circuit and method | |
| CN107911907B (en) | LED drive circuit, power converter and control method | |
| US8816597B2 (en) | LED driving circuit | |
| CN103108470B (en) | Dynamic linear control light emitting diode (LED) driver circuit | |
| CN102573235B (en) | High-efficiency light-emitting diode (LED) driving circuit and driving method thereof | |
| EP3150026B1 (en) | Led driver circuit, led circuit and drive method | |
| JP5311131B2 (en) | Light emitting diode lighting device | |
| TWI475794B (en) | Converter, electronic device and method for converting an ac input voltage to a regulated output current | |
| White et al. | An average current modulation method for single-stage LED drivers with high power factor and zero low-frequency current ripple | |
| EP3675603B1 (en) | Driving circuit and driving method for driving light emitting diode load | |
| US10492259B2 (en) | Dimmable LED driver and dimming method | |
| CN203352889U (en) | LED driving device and control circuit thereof | |
| EP2665340B1 (en) | LED driver circuits and methods | |
| EP2755447A1 (en) | Power supply circuit and luminaire | |
| CN110324935B (en) | Efficient linear LED driving circuit and method | |
| CN110602822A (en) | LED drive circuit and dimming control method thereof | |
| CN203072226U (en) | Dynamic-linear-control LED driving circuit | |
| RU2692700C2 (en) | Linear positioner | |
| CN102821505B (en) | Load driving circuit and load driving method | |
| CN102833903B (en) | Load drive circuit | |
| US20200375003A1 (en) | Linear constant-current led drive circuit adaptive to wide voltage range | |
| JP2011211132A (en) | Led driving circuit | |
| CN210405722U (en) | High-efficiency linear LED driving circuit | |
| CN103874279B (en) | Power circuit and lighting device | |
| CN109587891B (en) | High-efficiency linear LED driving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 215600 west side of Guotai North Road, Zhangjiagang Economic and Technological Development Zone, Suzhou City, Jiangsu Province Applicant after: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. Address before: 2nd Floor, Building A, No. 19-2 Zhongxing Road, Zhangjiagang Economic Development Zone, Suzhou City, Jiangsu Province, 215600 Applicant before: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |