CN109348578B - Lighting control method, control circuit and lighting system - Google Patents
Lighting control method, control circuit and lighting system Download PDFInfo
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- CN109348578B CN109348578B CN201811251392.3A CN201811251392A CN109348578B CN 109348578 B CN109348578 B CN 109348578B CN 201811251392 A CN201811251392 A CN 201811251392A CN 109348578 B CN109348578 B CN 109348578B
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- 238000005070 sampling Methods 0.000 claims description 20
- 238000005286 illumination Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 101100102849 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) VTH1 gene Proteins 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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Abstract
The invention discloses a lighting control method, a control circuit and a lighting system.A rectification voltage is obtained by rectification of an alternating current power supply to supply power to an LED lamp, the LED lamp is connected to the ground through a switching tube, and the current of the switching tube is controlled to be close to a reference current; when the current of the switching tube does not reach the reference current, the reference current is the first current, and a first working interval is formed; when the current of the switching tube reaches the reference current, the reference current is the second current, and a second working interval is formed; the first current is greater than the second current. By recessing the input current, a high efficiency of the lighting circuit is achieved. The method does not need to sample the drain voltage of the switching tube, and is simple to control and easy to realize.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an illumination control method, a control circuit and an illumination system.
Background
The linear LED driving circuit of the related art, as shown in fig. 1, includes a rectifier bridge 100, a switching tube M01, and a control circuit for controlling the switching tube. The alternating-current input voltage is subjected to rectification bridge to obtain rectification voltage VREC, an LED lamp and a switch tube M01 are connected between the rectification voltage VREC and the ground, the LED lamp and the switch tube M01 are connected in series, and a source electrode of the switch tube M01 is connected to the reference ground through a current sampling resistor R01. The control circuit comprises an operational amplifier U01, and the operational amplifier U01 realizes output constant current by adjusting the gate voltage of the switching tube M01 to ensure that the average value of Iout R01 is equal to the reference voltage VREF.
The voltage VIN, the voltage VLED across the LED and the output current waveform are shown in fig. 2, wherein the 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, that is, when the voltage VIN is greater than the voltage VLED across the LED, the greater the power consumption on the linear regulator M01, the lower the system efficiency, thereby affecting the system reliability.
Disclosure of Invention
Accordingly, the present invention is directed to an LED driving circuit for reducing power consumption of a linear adjusting tube, which is used for solving the technical problems of high power consumption and low system efficiency of the linear adjusting tube in the prior art.
The technical scheme of the invention is that the lighting control method is provided, an alternating current power supply is rectified to obtain a rectified voltage to supply power to an LED lamp, the LED lamp is connected with a switching tube in series, and the current of the switching tube is controlled to be close to a reference current; when the current of the switching tube does not reach the reference current, the reference current is a first current, and a first working interval is formed; when the current of the switching tube reaches the reference current, the reference current is a second current, and a second working interval is formed; the first current is greater than the second current.
Optionally, when the switching tube control electrode voltage is greater than a first voltage threshold, characterizing that the switching tube current does not reach the reference current; and when the voltage of the control electrode of the switching tube is smaller than a first voltage threshold value, the current of the switching tube is represented to reach the reference current.
Alternatively, characterizing the switching tube current as not reaching the reference current when the difference between the switching tube current and the reference current is greater than a first threshold; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, representing that the switching tube current reaches the reference current.
Optionally, in the second operation interval, the second current and the drain voltage of the switching tube have opposite change trends.
Optionally, the half power frequency period is timed to obtain an angle or a phase of the alternating current input, and the reference current is controlled according to the angle or the phase in the second working interval.
According to another technical scheme, the invention provides an illumination control circuit, an alternating current power supply is rectified to obtain a rectified voltage to supply power to an LED lamp, the LED lamp is connected with a switching tube in series, and the illumination control circuit controls the current of the switching tube to be close to a reference current; when the current of the switch tube does not reach the reference current, the reference current of the lighting control circuit is a first current, and a first working interval is formed; when the current of the switch tube reaches the reference current, the reference current of the lighting control circuit is a second current, and a second working interval is formed; the first current is greater than the second current.
Optionally, the switching tube voltage detection circuit comprises a first comparison circuit, wherein the first comparison circuit compares a switching tube control electrode voltage with a first voltage threshold value, and when the switching tube control electrode voltage is larger than the first voltage threshold value, the switching tube current is represented to be less than the reference current; and when the voltage of the control electrode of the switching tube is smaller than the first voltage threshold value, representing that the current of the switching tube reaches the reference current.
Alternatively, characterizing the switching tube current as not reaching the reference current when the difference between the switching tube current and the reference current is greater than a first threshold; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, representing that the switching tube current reaches the reference current.
Optionally, a current sampling circuit and a current control circuit are also included,
the current sampling circuit samples the switching tube current to obtain a second voltage representing the switching tube current, and the current control circuit enables the second voltage to be close to the reference voltage by adjusting the voltage of the control electrode of the switching tube;
and (3) timing a half power frequency period to obtain an angle or a phase of alternating current input, and controlling the reference current according to the angle or the phase in the second working interval.
A further aspect of the present invention is to provide a lighting system.
Compared with the prior art, the circuit structure provided by the invention has the following advantages: by recessing the input current, a high efficiency of the lighting circuit is achieved. The method does not need to sample the drain voltage of the switching tube, and is simple to control and easy to realize.
Drawings
FIG. 1 is a circuit block diagram of a prior art LED driver circuit;
FIG. 2 is a prior art operational waveform diagram corresponding to FIG. 1;
FIG. 3 is a lighting system employing the lighting control circuit of the present invention;
FIG. 4 shows the switching tube gate voltage G, the reference current, and the switching tube current I in one embodiment of the invention M01 Is a waveform diagram of (2);
FIG. 5 is a circuit schematic of one embodiment of an illumination control circuit 300 of the present invention;
FIG. 6 is a schematic circuit diagram of another embodiment of an illumination control circuit 300 according to the present invention;
FIG. 7 is a schematic circuit diagram of an embodiment of a current control circuit 310 according to the present invention;
FIG. 8 shows the DRAIN voltage DRAIN, reference current, and switching tube current I of the present invention M01 Is a waveform diagram of (2);
FIG. 9 is a circuit diagram of a lighting control circuit 300 according to another embodiment of the present invention;
FIG. 10 is a schematic circuit diagram of one embodiment of a voltage sampling circuit 320 of the present invention;
FIG. 11 is a schematic diagram of another embodiment of a current control circuit 310 according to the present invention;
fig. 12 is a circuit diagram of a current control circuit 310 according to another embodiment of the present invention.
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.
Referring to fig. 3, the present invention provides a lighting control circuit 300, an ac power supply is rectified to obtain a rectified voltage VREC to supply power to an LED lamp 200, the LED lamp 200 is connected to ground through a switching tube M01, and the lighting control circuit 300 controls the switching tube current to approach a reference current; when the current of the switch tube does not reach the reference current, the reference current of the lighting control circuit is a first current, and a first working interval is formed; when the current of the switch tube reaches the reference current, the reference current of the lighting control circuit is a second current, and a second working interval is formed; the first current is greater than the second current.
Please refer to fig. 4, which shows the switching tube control electrode voltage G, the reference current and the switching tube current I M01 Is a waveform diagram of (a). Before time t11, switching tube current I M01 The reference current is not followed, the switching tube is in a complete conduction state, the control electrode voltage G of the switching tube is in the maximum voltage, and the maximum voltage is the first working interval.
With increasing input voltage, switching tube current I M01 The reference current can not be followed, and the voltage of the control electrode of the switching tube is near the conducting threshold, namely, the time t11-t12 is the second working interval.
Input voltage drops, switching tube current I M01 The reference current cannot be followed, the switching tube is in a complete conduction state, the control electrode voltage G of the switching tube is in the maximum voltage, and the switching tube returns to the first working interval again, namely, the time t12-t 13.
The reference current waveform in the figure is only one embodiment, and the reference current may be any shape, and is not limited to the waveform in the figure.
According to the invention, whether the current of the switch tube can follow the reference current or not is detected, the lighting circuit is divided into a first working interval and a second working interval, the currents in the first working interval and the second working interval are respectively a first current and a second current, and the first current is larger than the second current. I.e. by recessing the input current, a high efficiency of the lighting circuit is achieved. The method is simple to control and easy to realize.
There are various ways to detect whether the switching tube current can follow the reference current. In one embodiment, this can be determined by detecting the switching tube gate voltage. When the switching tube current can follow the reference current, the switching tube control electrode voltage is near the threshold value; when the switching tube current cannot follow the reference current, the switching tube control electrode voltage is at a maximum value. Referring to fig. 5, the circuit includes a first comparing circuit 340, where the first comparing circuit 340 compares a switching tube control electrode voltage G with a first voltage threshold VTH1, and when the switching tube control electrode voltage G is greater than the first voltage threshold VTH1, the switching tube current is represented as not reaching the reference current; and when the voltage G of the control electrode of the switching tube is smaller than the first voltage threshold VTH1, the switching tube current is represented to reach the reference current.
In another embodiment, it may be determined whether the switching tube current can follow the reference current by detecting the magnitude of the difference between the switching tube current and the reference current. When the difference between the switching tube current and the reference current is larger than a first threshold value, the switching tube current is represented to be less than the reference current; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, the switching tube current is represented to reach the reference current.
Referring to fig. 6, the lighting control circuit includes a current control circuit 310, a current sampling circuit 330, and a first comparing circuit 340. The switching tube may be connected to a reference ground via a current sampling circuit 330, the current sampling circuit 330 sampling the switching tube current to obtain a second voltage V2 indicative of the switching tube current, the current control circuit 310 receiving the output voltage V2 of the current sampling circuit 330, the current control circuit 310 controlling the pole voltage G by adjusting the switching tube such that said second voltage V2 approaches the reference voltage VS. The current control circuit 310 outputs a difference E1 between the second voltage V2 and the reference voltage VS, the first comparison circuit 340 compares the E1 with the first threshold TH1, the current control circuit 310 receives an output voltage V3 of the first comparison circuit, and an operation section is selected according to V3.
Referring to fig. 7, in an embodiment of the current control circuit 310, the reference voltage VS and the second voltage V2 are amplified by an operational amplifier 313, and the output of the operational amplifier 313, that is, the output of the current control circuit 310, controls the control electrode of the switching transistor. Meanwhile, the subtracting circuit 319 subtracts the reference voltage VS and the second voltage V2 to obtain a difference E1 therebetween as the other output of the current control circuit. E1 is connected to one input of the first comparison circuit 340 in FIG. 6.
In the second operation interval, the reference current may be set to decrease with an increase in the DRAIN voltage draw such that the input current is concave. Please refer to fig. 8, which shows the switching tube DRAIN voltage DRAIN, the reference current and the switching tube current I M01 Is a waveform diagram of (a). Can also set the reference current to control along with the switchThe pole-making voltage G increases and decreases so that the input current is concave. The setting of the reference current is not limited to the above-described several setting modes, and various modes are possible.
And (3) timing the half power frequency period to obtain an angle or phase of alternating current input, and controlling the reference current according to the angle or phase in a second working interval. The relationship between angle or phase and reference voltage may be stored in the current control circuit 310. For example, if the trend of the reference current is opposite to the trend of the DRAIN voltage DRAIN, the corresponding relationship between the angle or phase and the DRAIN voltage may be stored in the current control circuit 310, and in the second working interval, the current angle or phase is obtained according to timing, and the reference current opposite to the trend of the DRAIN voltage DRAIN is obtained according to the current angle or phase.
Referring to fig. 9, the DRAIN voltage DRAIN may be sampled, and the reference current may be set to have a reverse trend with respect to the DRAIN voltage DRAIN. The lighting control circuit 300 comprises a voltage sampling circuit 320, a current sampling circuit 330 and a current control circuit 31, wherein the current sampling circuit samples the current of the switching tube to obtain a second voltage V2 representing the current of the switching tube, the voltage sampling circuit samples the drain voltage of the switching tube to obtain a first voltage V1, and the current control circuit adjusts the voltage of the control electrode of the switching tube to enable the second voltage to approach to the reference voltage; in the second working interval, the current control circuit controls the reference voltage to be equal to the difference between the first reference voltage VREF1 and the fourth voltage;
when the fourth voltage is equal to the first voltage, in the second operation interval, the reference voltage VS is equal to the first reference voltage VREF1 minus the first voltage V1, i.e., vs=vref 1-V1. Referring to fig. 10, the DRAIN voltage DRAIN of the switching tube is divided and sampled by a resistor R321 and a resistor R322 to obtain a first voltage V1, and the input current waveform is adjusted by adjusting the resistance of the resistor R321 and the resistor R322.
Referring to fig. 11, the fourth voltage V4 is equal to the product of the first voltage V1 and the first parameter K. Then in the second operating interval, the reference voltage vs=vref 1-k×v1. When the first parameter K is the compensation voltage or is controlled by the compensation voltage, the constant current of the LED lamp can be output. The output current and the reference current are amplified in an operation mode to obtain the compensation voltage.
When the first operation interval is switched to the second operation interval, the DRAIN voltage DRAIN of the switching tube is not zero as in FIG. 8, but has a certain voltage, so when the reference current is switched, the reference current is suddenly changed, the input current is suddenly changed, and the electromagnetic compatibility of the system is affected. Therefore, the holding voltage V1' is obtained by sampling and holding the DRAIN voltage at the time of switching, and in the second operation section,
referring to fig. 12, an embodiment of a current control circuit 310 is shown. The sample-and-hold circuit 315 samples and holds the first voltage V1 to obtain a holding voltage V1' when the first operation interval is switched to the second operation interval according to V3, the holding voltage V1' is subtracted from the first voltage V1 by the subtracting circuit 316, and the multiplying circuit 311 multiplies the first parameter K by (V1-V1 ') to obtain a fourth voltage V4. In the second operating interval, the reference voltage VS is equal to VREF1-K (V-V1').
The above methods can all be implemented such that the reference current decreases with increasing DRAIN voltage DRAIN in the second operating region.
The invention also provides a lighting control method, wherein the alternating current power supply is rectified to obtain rectified voltage to supply power to the LED lamp, the LED lamp is connected to the ground through the switch tube, and the current of the switch tube is controlled to be close to the reference current; when the current of the switching tube does not reach the reference current, the reference current is the first current, and a first working interval is formed; when the current of the switching tube reaches the reference current, the reference current is the second current, and a second working interval is formed; the first current is greater than the second current.
As one embodiment, when the switching tube control electrode voltage is greater than a first voltage threshold, characterizing that the switching tube current does not reach the reference current; and when the voltage of the control electrode of the switching tube is smaller than a first voltage threshold value, the current of the switching tube reaches the reference current.
As one embodiment, when the difference between the switching tube current and the reference current is greater than a first threshold value, characterizing the switching tube current as not reaching the reference current; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, representing that the switching tube current reaches the reference current.
As an embodiment, in the second operation interval, the second current and the drain voltage of the switching tube have opposite variation trends.
As an embodiment, the half power frequency period is timed to obtain the angle or phase of the ac input, and in the second working interval, the reference current is controlled according to the angle or phase.
As an embodiment, sampling a switching tube current to obtain a second voltage V2 representing the switching tube current, sampling a drain voltage of the switching tube to obtain a first voltage V1, and adjusting a switching tube control electrode voltage to enable the second voltage to be close to a reference voltage; in the second working interval, controlling the reference voltage to be equal to the difference between the first reference voltage and the fourth voltage;
the fourth voltage is equal to the first voltage or the fourth voltage is equal to the product of the first voltage and the first parameter.
As an embodiment, the first parameter is a compensation voltage, and the second voltage and the second reference voltage are subjected to operational amplification to obtain the compensation voltage.
The invention also provides an illumination circuit, which comprises the illumination control circuit.
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 (6)
1. According to the lighting control method, an alternating current power supply is rectified to obtain rectified voltage to supply power to an LED lamp, and the LED lamp is connected with a switch tube in series, and the lighting control method is characterized in that: controlling the current of the switching tube to reach the reference current; when the current of the switching tube does not reach the reference current, the reference current is a first current, and a first working interval is formed; when the current of the switching tube reaches the reference current, the reference current is a second current, and a second working interval is formed; the first current is greater than the second current, and the second current is concave; sampling the voltage of the control electrode of the switching tube and comparing the voltage with a first voltage threshold; when the voltage of the control electrode of the switching tube is larger than a first voltage threshold value, the current of the switching tube cannot reach the reference current; when the voltage of the control electrode of the switching tube is smaller than a first voltage threshold value, representing that the current of the switching tube reaches the reference current;
or detecting the switching tube current and comparing the switching tube current with the reference current; when the difference between the switching tube current and the reference current is larger than a first threshold value, representing that the switching tube current does not reach the reference current; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, representing that the switching tube current reaches the reference current.
2. A lighting control method as set forth in claim 1, wherein: and in the second working interval, the second current and the drain voltage of the switching tube have opposite change trends.
3. A lighting control method as set forth in claim 1, wherein: and (3) timing a half power frequency period to obtain an angle or a phase of alternating current input, and controlling the reference current according to the angle or the phase in the second working interval.
4. An illumination control circuit, AC power supply obtains the rectification voltage through the rectification and supplies power to the LED lamp, LED lamp and switch tube establish ties, its characterized in that: the lighting control circuit controls the current of the switching tube to reach the reference current; when the current of the switch tube does not reach the reference current, the reference current of the lighting control circuit is a first current, and a first working interval is formed; when the current of the switch tube reaches the reference current, the reference current of the lighting control circuit is a second current, and a second working interval is formed; the first current is greater than the second current, and the second current is concave; sampling the voltage of the control electrode of the switching tube and comparing the voltage with a first voltage threshold;
the switching tube voltage detection circuit comprises a first comparison circuit, wherein the first comparison circuit compares the voltage of a switching tube control electrode with a first voltage threshold value, and when the voltage of the switching tube control electrode is larger than the first voltage threshold value, the switching tube current is represented to be less than the reference current; when the voltage of the control electrode of the switching tube is smaller than the first voltage threshold value, representing that the current of the switching tube reaches the reference current;
or detecting the switching tube current, and representing that the switching tube current cannot reach the reference current when the difference between the switching tube current and the reference current is larger than a first threshold value; and when the difference between the switching tube current and the reference current is smaller than or equal to a first threshold value, representing that the switching tube current reaches the reference current.
5. A lighting control circuit as recited in claim 4, wherein: also comprises a current sampling circuit and a current control circuit,
the current sampling circuit samples the switching tube current to obtain a second voltage representing the switching tube current, and the current control circuit enables the second voltage to be close to the reference voltage by adjusting the voltage of the control electrode of the switching tube;
and (3) timing a half power frequency period to obtain an angle or a phase of alternating current input, and controlling the reference current according to the angle or the phase in the second working interval.
6. A lighting system comprising the lighting control circuit of any one of claims 4 or 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811251392.3A CN109348578B (en) | 2018-10-25 | 2018-10-25 | Lighting control method, control circuit and lighting system |
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| CN201811251392.3A CN109348578B (en) | 2018-10-25 | 2018-10-25 | Lighting control method, control circuit and lighting system |
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| CN110324935B (en) * | 2019-06-19 | 2024-05-24 | 杰华特微电子（张家港）有限公司 | Efficient linear LED driving circuit and method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442484A (en) * | 2013-08-15 | 2013-12-11 | 辉芒微电子（深圳）有限公司 | Linear switching constant current LED drive circuit and LED lamp |
| CN105101539A (en) * | 2015-07-13 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Light-emitting diode (LED) constant current driving circuit |
| CN105979630A (en) * | 2016-06-08 | 2016-09-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN205847656U (en) * | 2016-06-08 | 2016-12-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN106341923A (en) * | 2016-04-29 | 2017-01-18 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and linear LED driving circuit employing control circuit |
| CN106658851A (en) * | 2016-12-26 | 2017-05-10 | 浙江芯迈电子科技有限公司 | Constant-power LED driving system and constant-power control method |
| CN107529241A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN209710366U (en) * | 2018-10-25 | 2019-11-29 | 杰华特微电子（杭州）有限公司 | Illumination control circuit and lighting system |
-
2018
- 2018-10-25 CN CN201811251392.3A patent/CN109348578B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442484A (en) * | 2013-08-15 | 2013-12-11 | 辉芒微电子（深圳）有限公司 | Linear switching constant current LED drive circuit and LED lamp |
| CN105101539A (en) * | 2015-07-13 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Light-emitting diode (LED) constant current driving circuit |
| CN106341923A (en) * | 2016-04-29 | 2017-01-18 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and linear LED driving circuit employing control circuit |
| CN105979630A (en) * | 2016-06-08 | 2016-09-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN205847656U (en) * | 2016-06-08 | 2016-12-28 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN107529241A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN106658851A (en) * | 2016-12-26 | 2017-05-10 | 浙江芯迈电子科技有限公司 | Constant-power LED driving system and constant-power control method |
| CN209710366U (en) * | 2018-10-25 | 2019-11-29 | 杰华特微电子（杭州）有限公司 | Illumination control circuit and lighting system |
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