CN203072226U - Dynamic-linear-control LED driving circuit - Google Patents
Dynamic-linear-control LED driving circuit Download PDFInfo
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- CN203072226U CN203072226U CN 201320067933 CN201320067933U CN203072226U CN 203072226 U CN203072226 U CN 203072226U CN 201320067933 CN201320067933 CN 201320067933 CN 201320067933 U CN201320067933 U CN 201320067933U CN 203072226 U CN203072226 U CN 203072226U
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Abstract
The utility model discloses a dynamic-linear-control LED driving circuit, which comprising a rectifier module, a sampling module, a feedback module, a constant-current control module and a constant-current driving module, wherein the rectifier module is used for converting an input commercial power signal into a linear driving voltage signal to output to an LED load; the sampling module is used for acquiring the driving current flowing through the LED load; the feedback module is used for acquiring the linear driving voltage signal; the constant-current control module is used for generating a constant-current regulation signal according to the driving current, and generating a constant-current control signal according to the linear voltage driving signal; and the constant-current driving module is used for controlling the load current to be a constant current according to the constant-current regulation signal and the constant-current control signal. The switching-on and switching-off modes of the power switching tube are selected according to the magnitude of the linear voltage of the LED load, and the linear LED driving efficiency can be greatly improved. In case of low input voltage and high-efficiency working, the constant-current control module switches on the power switching tube so as to ensure that the LED is in a constant-current output state. In case of high input voltage and low-efficiency working, the constant-current control module switches off the power switching tube forcibly.
Description
Technical field
The utility model relates to LED and drives, and relates in particular to a kind of dynamic linear control led drive circuit.
Background technology
Along with popularizing of green illumination, light-emitting diode (LED:Light Emitting Diode) illumination has obtained development at full speed.The LED driving power generally all is to have adopted Switching Power Supply to realize.Linear driving power is all abandoned by engineers because of the problem of efficient.Fig. 1 is the schematic diagram of traditional LED Linear Driving circuit, and as shown in Figure 1, rectifier bridge 110 is made up of 4 high-voltage diodes, and filter capacitor 101 is city's signal of telecommunication (being generally sinusoidal alternating voltage) rectification direct voltage.The supply module of control chip 105 comprises the decoupling capacitor 104 of divider resistance 102, clamp diode 103 and control chip, and supply module can be told the voltage of about 10V and give the driving chip operation from the input voltage of about 300VDC.The major function of control chip 105 is to stablize the drive current of LED, and no matter how input voltage changes, or no matter how LED load 106 changes, and its drive current by LED all is invariable.
Wherein, LED load 106 is exactly the load LED lamp string of this driving, and it needs constant electric current to drive, and it is fixed that the size of electric current is come by the kind of LED, and the LED drive current of general high brightness is 300mA.The driving switch 107 of driving power is generally power MOSFET.The resistance of the detection resistance 108 of drive current has determined the size of drive current.
The principle of the Linear Driving power supply among Fig. 1 is: control chip 54 voltages at nodes of sampling guarantee that by adjusting 53 voltages at nodes 54 node places are constant voltage, thereby are steady state value: I_led=Vcs/Rcs by the drive current of LED; Wherein, I_led is the drive current by LED load 106, and Vcs is the voltage of control chip CS pin, i.e. the voltage at node 504 places.
The advantage of the circuit that this linear constant current drives is exactly that circuit is simple, and cost is low, and electromagnetic interference is low, but a fatal weakness is arranged: efficient is poor, longevity system.
Fig. 2 shows the oscillogram of the voltage at node 50,51 among Fig. 1,53 and 54 places, and as shown in Figure 2, node 50 places are the civil power voltage of signals Vac of input, and the civil power voltage of signals scope in the whole world is 90VAC～265VAC.Node 51 places are that its size is through filtered line voltage (also being referred to as linear voltage) Vline
Node 54 places are the reference voltage V cs that determined by control chip 105, are generally the voltage about 0.5V.Node 53 places are the driving voltage Vout of control chip 105.(V_led * I_led+I_led * Vd), V_led is the pressure drop of LED load 106 to the efficiency eta=V_led of its work * I_led/, and I_led is the drive current of LED, and Vd is the voltage of power switch pipe 107 drain terminals, i.e. the voltage at node 52 places.For example, can be 100V for output voltage, output current is the high-voltage LED scheme of the 5W of 50mA.
In the practical application, the drive circuit among Fig. 1 in the efficient of 90VAC up to 78%, but when the input voltage of 135VAC, efficient has only 52%, if full voltage range work, efficient is low to moderate 30% when 265VAC, system can't work at all.Therefore, above-mentioned drive circuit (can be worked in the scope of 90Vac～136Vac) reluctantly at univoltage.But its inefficient loss all is to concentrate on power switch pipe 107.The heat radiation of power switch pipe and life-span have proposed very high requirement to linear LED driving power.Therefore, need a kind of linear constant current drive scheme that solves efficient and life-span.
The utility model content
The technical problems to be solved in the utility model is the inefficient defective at prior art neutral line control led drive circuit, and a kind of dynamic linear control led drive circuit is provided.
The technical scheme that its technical problem that solves the utility model adopts is: the utility model provides a kind of dynamic linear control led drive circuit, comprising:
Rectification module is used for city's signal of telecommunication of input is converted to the Linear Driving voltage signal, to export to the LED load;
Sampling module is used for obtaining the drive current that flows through described LED load;
Feedback module is used for obtaining described Linear Driving voltage signal;
The constant current control module is used for generating the constant flow regulation signal according to described drive current, and is used for generating the constant current control signal according to described linear voltage;
Constant-current driven module, being used for controlling described load current according to described constant flow regulation signal and described constant current control signal is constant current.
In the dynamic linear control led drive circuit of foundation the utility model embodiment,
Described rectification module comprises rectifier bridge, and the common cathode end of described rectifier bridge connects the positive terminal of described LED load, the common anode tap ground connection of described rectifier bridge, the described city of the other two terminations signal of telecommunication of described rectifier bridge;
Described constant-current driven module comprises power switch pipe, and the grid of described power switch pipe connects the output of described constant current control module, and drain electrode connects the negative pole end of described LED load;
Described sampling module comprises sampling resistor, the first input end that first end of described sampling resistor connects the source electrode of described power switch pipe and connects described constant current control module, the second end ground connection; So that described constant current control module generates the described constant flow regulation signal of the grid voltage size that is used for the described power switch pipe of control according to the voltage swing at described sampling resistor two ends, and export the grid of described power switch pipe to from described output, be constant voltage with the voltage control with described sampling resistor two ends;
Described feedback module comprises first resistance and second resistance, the common port of described first resistance and second resistance is connected second input of described constant current control module, the other end of described first resistance connects the negative pole end of described LED load, the other end ground connection of described second resistance; So that described constant current control module generates the described constant current control signal that is used for the described power switch pipe conducting of control or closes according to the voltage swing at described common port place, and export the grid of described power switch pipe to from described output.
In the dynamic linear control led drive circuit of foundation the utility model embodiment, described power switch pipe is power MOSFET.
In the dynamic linear control led drive circuit of foundation the utility model embodiment, described dynamic linear control led drive circuit further comprises the power factor adjustment module for the power factor that improves described dynamic linear control led drive circuit; Wherein,
Described power factor adjustment module comprises auxiliary LED load and auxiliary power switching tube;
The positive terminal of described auxiliary LED load is connected with the negative pole end of described LED load;
The drain electrode of described auxiliary power switching tube connects the negative pole end of described auxiliary LED load, and source electrode connects the first input end of described constant current control module, and grid connects second input of described constant current control module; So that described auxiliary power switching tube is under the control of described constant current control module, conducting a period of time at least of closing in the cycle at described power switch pipe is improved the continuity of described drive current, to improve the power factor of described dynamic linear control led drive circuit.
In the dynamic linear control led drive circuit of foundation the utility model embodiment, described auxiliary power switching tube is power MOSFET.
In the dynamic linear control led drive circuit of foundation the utility model embodiment, described dynamic linear control led drive circuit further comprises decoupling capacitor; The two ends of described decoupling capacitor are connected with negative pole end with the positive terminal of described LED load respectively.
The beneficial effect that the utility model produces is: the pattern according to the linear voltage size of LED load is selected the power switch pipe conducting and closed, can improve the efficient that linear LED drives greatly.Particularly, at low input, in the time of efficiency operation, the constant current control module guarantees that LED is at the state of constant current output to the power switch pipe conducting.At high input voltage, in the time of inefficient work, the constant current control module is closed power switch pipe by force.So in the sinusoidal ac of one-period, when the mains input voltage was in non-crest, the mode of operation of the drive circuit in the utility model was the same with existing linear led drive circuit.When the mains input voltage was in crest, the power switch pipe of the drive circuit in the utility model entered " shut " mode", drive circuit can be from city's signal of telecommunication consumed power.Compare with existing linear led drive circuit so, efficient is significantly improved.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of traditional LED Linear Driving circuit;
Fig. 2 shows the oscillogram of the voltage at node 50,51 among Fig. 1,53 and 54 places;
Fig. 3 shows the circuit diagram according to the dynamic linear control led drive circuit of the utility model embodiment;
Fig. 4 shows the oscillogram of the voltage at node 50,51 among Fig. 3,53 and 54 places;
Fig. 5 shows the circuit diagram of the drive circuit that comprises the power factor adjustment module;
Fig. 6 shows the oscillogram of the voltage at node 50,51,53 among Fig. 5,56 and 54 places;
Fig. 7 shows the structural representation according to the constant current control module of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 3 shows the circuit diagram according to the dynamic linear control led drive circuit of the utility model embodiment, as shown in Figure 3, this dynamic linear control led drive circuit (the following drive circuit that abbreviates as) comprising: rectification module 100, sampling module 200, feedback module 300, constant current control module 400 and constant-current driven module 500.Wherein, rectification module 100 can be converted to the Linear Driving voltage signal with city's signal of telecommunication of input, and this Linear Driving voltage signal is exported to the LED load, with the driving LED loaded work piece.Sampling module 200 can obtain the drive current that flows through the LED load, and exports to constant current control module 400.Feedback module 300 can obtain the Linear Driving voltage signal, and feeds back to constant current control module 400.Like this, constant current control module 400 can generate the constant flow regulation signal according to drive current, and generates the constant current control signal according to linear voltage; And this constant flow regulation signal and constant current control signal exported to constant-current driven module 500.It is constant current that constant-current driven module 500 can come the control load electric current according to constant flow regulation signal and constant current control signal.
Particularly, in preferred embodiment of the present utility model, rectification module 100 comprises rectifier bridge, and this rectifier bridge can be made of four high-voltage diodes.Wherein, the common cathode end of rectifier bridge connects the positive terminal of LED load, the common anode tap ground connection of rectifier bridge, the other two termination civil power signals of rectifier bridge, the i.e. input of AC among Fig. 2.
Constant-current driven module 500 comprises power switch pipe, and this power switch pipe can be power MOSFET.The grid of power switch pipe connects the output OUT of constant current control module 400, and drain electrode connects the negative pole end of LED load.In the utility model, number designation 500 also can be represented power switch pipe.
Fig. 4 shows the oscillogram of the voltage at node 50,51 among Fig. 3,53 and 54 places, sets forth the course of work of the drive circuit among Fig. 3 below in conjunction with the voltage oscillogram of Fig. 4.At first, constant current control module 400 receives the voltage at sampling resistor two ends from first input end CS, because determined the drive current of LED load by the electric current of sampling resistor, therefore, the voltage control that needs only the sampling resistor two ends is constant voltage, just the drive current of LED load can be controlled to be constant current.In the work, constant current control module 400 can be according to the voltage at the sampling resistor two ends that obtain, generate the constant flow regulation signal, this constant flow regulation signal can be for directly exporting the grid voltage of power switch pipe to, can guarantee that by the size (being the concrete numerical value of grid voltage) of regulating this grid voltage the voltage at sampling resistor two ends is steady state value, thereby make that the drive current that flows through the LED load is constant current.From here as can be seen, the constant flow regulation signal deciding size of the Vout among Fig. 4.
On the other hand, node 50 places are the ac voltage signal Vac of input, and node 51 places are process arrangement filtered Linear Driving voltage signal (can abbreviate line voltage as) Vline, and this voltage signal is used for the driving LED loaded work piece.Line voltage is through the dividing potential drop of LED load, first resistance 310 and second resistance 320, the voltage at node 55 places, be input voltage VFB=(Vline-V_led) * R_320/ (R_310+R_320) of the second input FB of constant current control module 400, wherein, V_led is the voltage drop of LED load, and R_310 and R_320 are respectively first resistance 310 of Fig. 3 and the resistance of second resistance 320.At this moment, the voltage waveform at node 55 places is the same with the waveform at node 51 places, and namely the oscillogram of voltage VFB is the same with the oscillogram of Vline.
Should be noted that, the waveform of linear voltage Vline among Fig. 4 is different from the waveform of the linear voltage Vline among Fig. 2, and this is because the appearance value of the filter capacitor 101 of Fig. 1 is very big, generally needs electrochemical capacitor, and adopt traditional mode of operation, and do not consider the correction of power factor.Yet for the drive circuit among Fig. 3, the appearance value of its filter capacitor 101 is very little, does not need to adopt electrochemical capacitor, and might be in conjunction with the optimization of power factor, and therefore, the Vline waveform of Fig. 4 and Fig. 2 is different.
In the work, constant current control module 400 generates the constant current control signal that is used for control power switch pipe conducting or closes according to the information of voltage of VFB, and this constant current control signal is exported to the grid of power switch pipe from the output OUT of constant current control module 400.For example, if the voltage swing of VFB greater than a predefined reference voltage, constant current control module 400 generates and closes the constant current control signal of power switch pipe, thereby closes the driving voltage of output OUT.For example, as shown in Figure 4, waveform referring to the voltage Vout of the output OUT of constant current control module 400 output, when the voltage of Vline during greater than certain value, Vout just becomes zero potential, because output OUT is zero potential, power switch pipe just is in not on-state, electric current by detection resistance just is zero, and the voltage Vcs of first input end CS also is zero so, as shown in Figure 4.From here as can be seen, the constant current control signal has determined the Vout among Fig. 4 that drive voltage signal output is arranged, and still no-voltage is exported, i.e. outputting drive voltage signal not.
This pattern of selecting the power switch pipe conducting and closing according to the voltage swing of Vline can improve the efficient that linear LED drives greatly.At low input, in the time of efficiency operation, constant current control module 400 guarantees that LED is at the state of constant current output to the power switch pipe conducting.At high input voltage, in the time of inefficient work, constant current control module 400 is closed power switch pipe by force.So in the sinusoidal ac of one-period, when input voltage Vac was in non-crest, the mode of operation of the drive circuit in the utility model was the same with existing linear led drive circuit.When input voltage Vac was in crest, the power switch pipe of the drive circuit in the utility model entered " shut " mode", drive circuit can be from city's signal of telecommunication consumed power.Compare with existing linear led drive circuit so, efficient is significantly improved.In addition, system is in one-period, and some time is in closed condition, and the control ratio of constant current is difficulty, and what the utility model adopted is that the average current feedback technique is realized.109 of Fig. 3 is the building-out capacitor of loop.
Though adopt feedback module 300 to improve efficient, but brought another problem, because the crest place at one-period, drive circuit is in closed condition, input current (drive current of LED load) is zero, thereby input voltage and input current is asynchronous, has caused the power factor variation.So, address this problem, further comprise power factor adjustment module for the power factor that improves this drive circuit according to the dynamic linear of the utility model embodiment control led drive circuit.
Fig. 5 shows the circuit diagram of the drive circuit that comprises the power factor adjustment module, and as shown in Figure 5, the power factor adjustment module comprises auxiliary LED load 710 and auxiliary power switching tube 720; The positive terminal of auxiliary LED load 710 is connected with the negative pole end of LED load 106; The drain electrode of auxiliary power switching tube 720 connects the negative pole end of auxiliary LED load 710, and source electrode connects the first input end CS of constant current control module 400, and grid connects the second input FB of constant current control module 400; So that auxiliary power switching tube 720 is under the control of constant current control module 400, improve the continuity of drive current in conducting a period of time at least of closing in the cycle of power switch pipe, to improve the power factor of dynamic linear control led drive circuit.Wherein, auxiliary power switching tube 720 can be power MOSFET.
Fig. 6 shows the oscillogram of the voltage at node 50,51,53 among Fig. 5,56 and 54 places, and wherein, node 50 places are the civil power voltage of signals Vac of input; Node 51 places are through filtered line voltage Vline; Node 53 places are the output voltage V out of the output OUT of constant current control module 400; Node 56 places are the output voltage V out2 of the second output OUT2 of constant-current controller; Node 54 places are voltage Vcs of the first input end CS of constant current control module 400.
In conjunction with Fig. 5 and Fig. 6 as can be seen, auxiliary LED load 710 is closed in the cycle conducting a period of time at least power switch pipe, preferably, and only in the crest district conducting work near the alternating current input.Auxiliary power switching tube 720 is used for the work period of control auxiliary LED load 710.For example, as shown in Figure 6, referring to the waveform of the driving voltage Vout2 of the auxiliary power switching tube of the second output OUT2 of constant current control module output, it is chosen near the conducting of crest time zone.Can reduce power switch pipe and auxiliary power switching tube time of not conducting simultaneously all so greatly, namely improve the continuity of input current, thereby improved the power factor of system.
Still as Fig. 3 and shown in Figure 5, control led drive circuit according to the dynamic linear of the utility model embodiment and also can further comprise decoupling capacitor 600; The two ends of this decoupling capacitor 600 are connected with negative pole end with the positive terminal of LED load respectively.This decoupling capacitor can reduce the ripple of LED output current, reduces the light decay of LED, guarantees its life-span.
Fig. 7 shows the structural representation according to the constant current control module of the utility model embodiment, and as shown in Figure 7, this constant current control module comprises power supply unit 401, for constant current control mould improves reference voltage and supply power voltage.Also comprise line voltage detection unit 403, detect the size of input voltage by second input (being the FB pin) of constant current control mould, select constant current control mould to be operated in different mode of operations.Constant current control mould also comprises loop constant current control unit 404,405 and 406, and average current detection unit 404, by the signal of detection line voltage detection unit 403 and first input end, calculates the average current by the LED load.Label 405 expression error amplifiers wherein, its effect are that the input signal by adjustment loop constant current control unit 406 guarantees that the end of oppisite phase voltage of error amplifier 405 equals the reference voltage of positive terminal, thereby guarantee the output current steady state value.The constant current control module also comprises logic control element 407, and it is the signal processing center of whole drive circuit.The switch of its control driver element 408 when realizing that finally constant current drives, guarantees the high efficiency of system, High Power Factor.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (6)
1. a dynamic linear control led drive circuit is characterized in that, comprising:
Be used for city's signal of telecommunication of input is converted to the rectification module of Linear Driving voltage signal, and described Linear Driving voltage signal is exported to the LED load;
Be used for obtaining the sampling module of the drive current that flows through described LED load;
Be used for obtaining the feedback module of described Linear Driving voltage signal;
Be used for according to described drive current generation constant flow regulation signal and for the constant current control module that generates the constant current control signal according to described linear voltage;
Be used for controlling the constant-current driven module that described load current is constant current according to described constant flow regulation signal and described constant current control signal.
2. dynamic linear control led drive circuit according to claim 1 is characterized in that,
Described rectification module comprises rectifier bridge, and the common cathode end of described rectifier bridge connects the positive terminal of described LED load, the common anode tap ground connection of described rectifier bridge, the described city of the other two terminations signal of telecommunication of described rectifier bridge;
Described constant-current driven module comprises power switch pipe, and the grid of described power switch pipe connects the output of described constant current control module, and drain electrode connects the negative pole end of described LED load;
Described sampling module comprises sampling resistor, the first input end that first end of described sampling resistor connects the source electrode of described power switch pipe and connects described constant current control module, the second end ground connection; So that described constant current control module generates the described constant flow regulation signal of the grid voltage size that is used for the described power switch pipe of control according to the voltage swing at described sampling resistor two ends, and export the grid of described power switch pipe to from described output, be constant voltage with the voltage control with described sampling resistor two ends;
Described feedback module comprises first resistance and second resistance, the common port of described first resistance and second resistance is connected second input of described constant current control module, the other end of described first resistance connects the negative pole end of described LED load, the other end ground connection of described second resistance; So that described constant current control module generates the described constant current control signal that is used for the described power switch pipe conducting of control or closes according to the voltage swing at described common port place, and export the grid of described power switch pipe to from described output.
3. dynamic linear control led drive circuit according to claim 2 is characterized in that described power switch pipe is power MOSFET.
4. dynamic linear control led drive circuit according to claim 2 is characterized in that, described dynamic linear control led drive circuit further comprises the power factor adjustment module for the power factor that improves described dynamic linear control led drive circuit; Wherein,
Described power factor adjustment module comprises auxiliary LED load and auxiliary power switching tube;
The positive terminal of described auxiliary LED load is connected with the negative pole end of described LED load;
The drain electrode of described auxiliary power switching tube connects the negative pole end of described auxiliary LED load, and source electrode connects the first input end of described constant current control module, and grid connects second input of described constant current control module; So that described auxiliary power switching tube is under the control of described constant current control module, conducting a period of time at least of closing in the cycle at described power switch pipe is improved the continuity of described drive current, to improve the power factor of described dynamic linear control led drive circuit.
5. dynamic linear control led drive circuit according to claim 4 is characterized in that described auxiliary power switching tube is power MOSFET.
6. according to each described dynamic linear control led drive circuit of claim 1-5, it is characterized in that described dynamic linear control led drive circuit further comprises decoupling capacitor; The two ends of described decoupling capacitor are connected with negative pole end with the positive terminal of described LED load respectively.
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| CN 201320067933 CN203072226U (en) | 2013-02-06 | 2013-02-06 | Dynamic-linear-control LED driving circuit |
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| CN 201320067933 CN203072226U (en) | 2013-02-06 | 2013-02-06 | Dynamic-linear-control LED driving circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103648216A (en) * | 2013-12-06 | 2014-03-19 | 武汉精立电子技术有限公司 | Intelligent constant-current high-power LED driving method |
| CN103648215A (en) * | 2013-12-06 | 2014-03-19 | 武汉精立电子技术有限公司 | Intelligent adjustable high-power LED driving device |
| CN106658879A (en) * | 2015-08-03 | 2017-05-10 | 华润矽威科技（上海）有限公司 | LED driving device and driving method therefor |
| CN113286398A (en) * | 2021-05-31 | 2021-08-20 | 深圳市必易微电子股份有限公司 | Load driving circuit and driving method |
| CN114484366A (en) * | 2022-01-21 | 2022-05-13 | 东莞市智桥电器制造有限公司 | New light source and control system of electric fireplace |
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2013
- 2013-02-06 CN CN 201320067933 patent/CN203072226U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103108470B (en) * | 2013-02-06 | 2015-06-03 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103648216A (en) * | 2013-12-06 | 2014-03-19 | 武汉精立电子技术有限公司 | Intelligent constant-current high-power LED driving method |
| CN103648215A (en) * | 2013-12-06 | 2014-03-19 | 武汉精立电子技术有限公司 | Intelligent adjustable high-power LED driving device |
| CN103648215B (en) * | 2013-12-06 | 2016-08-24 | 武汉精立电子技术有限公司 | The adjustable great power LED driving means of intelligence |
| CN106658879A (en) * | 2015-08-03 | 2017-05-10 | 华润矽威科技（上海）有限公司 | LED driving device and driving method therefor |
| CN106658879B (en) * | 2015-08-03 | 2019-05-21 | 华润矽威科技（上海）有限公司 | LED drive device and its driving method |
| CN113286398A (en) * | 2021-05-31 | 2021-08-20 | 深圳市必易微电子股份有限公司 | Load driving circuit and driving method |
| CN114484366A (en) * | 2022-01-21 | 2022-05-13 | 东莞市智桥电器制造有限公司 | New light source and control system of electric fireplace |
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Denomination of utility model: Dynamic linear control light emitting diode (LED) driver circuit Effective date of registration: 20150902 Granted publication date: 20130717 Pledgee: Shenzhen tekall Zhitong financing Company limited by guarantee Pledgor: SILICON DRIVER SEMICONDUCTOR Co.,Ltd. Registration number: 2015990000755 |
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