CN208094847U - A kind of efficient low ripple dimming LED drive circuit - Google Patents
A kind of efficient low ripple dimming LED drive circuit Download PDFInfo
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Abstract
The utility model discloses a kind of efficient low ripple dimming LED drive circuits, including EMI filter circuit, current rectifying and wave filtering circuit, BOOST APFC circuits, BUCK decompression constant-current circuit, pwm signal control circuit and high pressure BUCK auxiliary power supply circuits.A kind of efficient low ripple dimming LED drive circuit of the utility model, the alternating current of AC90-264V is through EMI filter circuit, by the DC voltage that bridge rectifier is pulsation, BOOST APFC circuits carry out PFC to input current and export constant high voltage direct current, constant electric current is exported to LED load through BUCK decompression constant-current circuits, and output average current is related with PWM dim signal duty ratios.Pwm signal control circuit is modulated PWM dim signals, so that PWM dim signals duty ratio is met the requirement of light modulation change curve with LED load curent change and handles a series of problems of dimming process and switching on and shutting down inverse time sequence.
Description
Technical field
The utility model is related to LED drive power fields, more particularly to the LED drive power with dimming function, specifically
It is a kind of efficient low ripple dimming LED drive circuit that ground, which is said,.
Background technology
LED is high with its light efficiency, reliability is high, long lifespan and green non-pollution become lighting source of new generation, has obtained
Extensive use.Currently, new dimming function LED drivings requirement startup speed is fast, high-frequency, high PF, fixation set light curve, switch
The characteristics such as machine flicker free, wireless or WIFI many motors controls.According to the distinctive C-V characteristics of LED, LED drivings mostly use greatly constant current drive
The luminous intensity of flowing mode, LED is driven by it electric current decision, as shown in Figure 1.As long as changing driving current changes LED
Brightness, realize dimming function.There are three types of the dimming modes of usual LED drivings, TRAIC light modulations, simulation light modulation and PWM light modulations,
General light modulation demand can be met.But more stringent requirements are proposed to brightness adjustment control mode and light modulation precision by people, light modulation
The change curve of electric current is had nothing in common with each other, and the change rate of electric current is directly related to the variation of LED light luminous flux.And usual dimming mode
Inherent defect fall into be unable to reach its requirement.
Common LED drivings dimming mode has TRAIC light modulations, simulation light modulation and PWM light modulations etc..
One, TRAIC is dimmed
TRAIC light modulations are a kind of dimming modes being generally used in conventional incandescent and halogen lamp.Its work is former
Reason is to generate the output voltage waveforms of a cut phase after the waveform of input voltage is cut wave by the angle of flow.Using cut phase
Principle can reduce the virtual value of output voltage, and the power of normal load (ohmic load) is reduced with this, cut before being generally divided into
After cut two kinds of modes.
TRIAC dimmer applications are in LED drive circuit, at present the biggest problems are that the compatibility of light modulator.For
The characteristics of TRIAC light modulators, must increase in LED drive circuit it is active release or passive leadage circuit, hold up electricity to provide
Stream and maintenance electric current, using the LED drive control chips of compatible TRIAC light modulations, rationally adjustment controls the parameter of chip.If set
It is improper to count, and the TRIAC light modulators and LED driving circuits being made of high-power switch device influence each other unstable, it may appear that
Visual flicker.
TRIAC destroys sinusoidal waveform, reduces power factor, and increase harmonic constant, is much compatible with existing
The chip and scheme of TRIAC light modulators, which are called oneself, PFC, and there is no the power factors of the whole system including TRIAC.It is all
The LED light adjusting systems rectification efficiency of compatible TRIAC is all very low, is easily flickered in light modulation angle hour, destroys the efficient of LED completely
Energy.The impossible compatible all TRIAC light modulators of LED drive controls chip of actually all compatible TRIAC light modulations, and can only
A compatible part therein.
Although there are many disadvantages for TRIAC light modulations, there is certain advantage, because its early period has already taken up prodigious light modulation
Market haves no need to change former illuminating line, is also not required to as long as changing the LED lamp with compatible TRAIC dimming functions
Reinstall light modulator.
TRIAC light modulations are the obsolete techniques with over half a century, are a kind of earlier techniques, are applied to LED light modulations and shine
Bright only transitionality, is unworthy recommending.
Two, simulation light modulation
The principle for simulating light modulation is very simple, exactly controls the brightness of LED light by changing the output current of LED drivings.
The voltage of port is typically dimmed by adjusting current constant control chip to realize, because constant current drive control chip all provides one
Dimmer voltage control port as long as changing input control voltage changes the output constant current value of power supply, that is, changes
The a reference source of comparator.
Fig. 1 is that 0-10V light modulation isolation flyback LED drive circuits change chip current benchmark by 0-10V voltage changes
The voltage of port (IREF) changes output current.Advantage be it is simple, conveniently, it is practical, dynamic speed is fast.But circuit is complicated,
Inefficiency, when dim signal is low, circuit can be unstable.
Fig. 2 is the linear dimming function LED drive circuit of non-isolated BUCK voltage-dropping types, is inputted in the linearity light adjusting of chip
Port（LD）Apply voltage or adjust external SW, so that it may flow through the electric current of LED with convenient control.This mode control simply, at
This is low, and non-isolated BUCK groundworks obtain average current in DCM patterns, by monitoring the Ipk on CS.It is electric on the basis of disadvantage
When pressure is very low, it is difficult to examine signal, error-prone, precision is low.
Simulation dimming arrangement advantage is simple, convenient, practicality.But due to simulating the forward direction that light modulation is direct adjustment LED
Electric current changes forward voltage values, and degree of lightening while can also change its spectrum and colour temperature, although may not in actual illumination
Big problem at last, is also unable to get accurate light modulation, does not adapt to the requirement of complicated dimming curve.
Three, PWM is dimmed
It is a diode that PWM light modulations, which are based on LED, and high-speed switch may be implemented in it, its switching speed can be up to
It is more than microsecond, be any luminescent device it is incomparable.Therefore, as long as power supply is made into pulsed constant current supply, with change pulse
The method of width, so that it may to change its brightness.
As shown in figure 5, when PWM is dimmed, the ports PWMDIM of pwm signal input control chip, control chip detection PWM letters
The grid signal of power field effect pipe is modulated and changed to number change in duty cycle, and control is fast with the concatenated power field effect pipes of LED
Speed is opened and is turned off, to achieve the purpose that adjust LED current size.
PWM light modulations not will produce chromatography offset, and dimming scope is wide, precision is high, and it is existing that flicker will not occur when modulating frequency is high
As that can be combined with digital control technology to be controlled；But it is noted that reasonably selecting pwm signal frequency when being dimmed using PWM
What rate and elimination light modulation were drawn utters long and high-pitched sounds.
PWM light regulating technologies are presently believed to be most promising LED light regulating technologies.
Due to the requirement of power factor index, the high PF flyback topologies of monopole and monopole BUCKBOOST add low ripple to control
The dimming function of two kinds of modes of circuit need to be realized by front stage circuits, and inputting light modulation part does not have electrolytic capacitor, lightning stroke to test
Or PWM light modulations are anti-interference relatively difficult to achieve, and the MOSFET of low ripple control is operated in linear region, and loss is larger to be influenced
2% efficiency must realize requirement of light regulation using more rationally succinct scheme.
Invention content
To be solved in the utility model is problem of the existing technology, it is desirable to provide a kind of efficient low ripple, flicker free
Dimming LED drive circuit.
To solve the above problems, the utility model uses following technical scheme：A kind of efficient low ripple dimming LED (Light Emitting Diode) driving electricity
Road, including EMI filter circuit, current rectifying and wave filtering circuit, BOOST APFC circuits, BUCK decompression constant-current circuit, pwm signal control electricity
Road and high pressure BUCK auxiliary power supply circuits, it is characterised in that：
The EMI filter circuit, input termination alternating current, output termination current rectifying and wave filtering circuit；
The current rectifying and wave filtering circuit, the output end of input termination EMI filter circuit, output termination BOOST APFC electricity
Road；
The BOOST APFC circuits, the output end of input termination current rectifying and wave filtering circuit, output termination BUCK decompressions
Constant-current circuit；
The output end and pwm signal control electricity of the input termination BOOST APFC circuits of the BUCK decompression constant-current circuits
The signal output end on road, output termination LED load；
The pwm signal control circuit, input termination PWM dim signals and BOOST APFC circuit outputs it is anti-
Feedback signal, output termination BUCK are depressured constant-current circuit；
The high pressure BUCK auxiliary power supply circuits, the output end of input termination BUCK decompression constant-current circuits, output
Terminate the power end of BOOST APFC circuits, BUCK decompressions constant-current circuit, pwm signal control circuit.
A kind of efficient low ripple dimming LED drive circuit of the utility model, the alternating current of AC90-264V are filtered through EMI
Circuit, by the DC voltage that bridge rectifier is pulsation, BOOST APFC circuits carry out PFC simultaneously to input current
Constant high voltage direct current is exported, constant electric current is exported to LED load through BUCK decompression constant-current circuits, exports average current
It is related with PWM dim signal duty ratios.Pwm signal control circuit is modulated PWM dim signals, and PWM dim signals is made to account for
Sky is than meeting the requirement of light modulation change curve with LED load curent change and handling a system of dimming process and switching on and shutting down inverse time sequence
Row problem.
High pressure BUCK auxiliary power supply circuits, working power is provided for each control circuit.
According to the utility model, the BOOST APFC circuit control chips use the power of critical current operating mode
Factor correcting chip MP44014.The circuit has simple in structure, small, stable and reliable in work, PF values height, THD values low.Bridge
Rectified alternating current after formula rectification essentially eliminates low-frequency ripple through the constant direct current 400V of BOOST APFC circuit outputs, protects
The low-frequency ripple electric current deal in the LED current of late-class circuit output is demonstrate,proved within 5%, while the power factor of input circuit reaches
To 0.9 or more.
According to the utility model, the high pressure BUCK auxiliary power supply circuit control chips use MP150 or MP170.It is high
High voltage direct current 400V is converted to low-voltage direct 15V by pressure BUCK auxiliary power supplies circuit, quickly provides power supply for each control circuit,
The machine time of rising that LED drives is set to be less than 0.5 second.
According to the utility model, the BUCK is depressured constant-current circuit using the high-precision voltage-dropping type LED for supporting PWM light modulations
Constant-current driven chip MP4700.
According to the utility model, the pwm signal control circuit includes microcontroller and photoelectrical coupler, the microcontroller
Input termination photoelectrical coupler output end, the microcontroller output termination BUCK decompression constant-current circuit control input
End；The input of the photoelectrical coupler terminates PWM dim signals, and output end connects microcontroller.The pwm signal control circuit is adopted
The signal of input is changed into required frequency variation signal with microcontroller, then controls BUCK circuits.The microcontroller major functions and features are
High performance-price ratio, low pin small package, operating voltage range are wide, support low-power consumption mode, internal reset, internal crystal oscillator frequency highest
25MHz, inner cryogenic drift coefficient, 1T instruction execution speeds, high-speed sampling AD, 10BIT precision, I/O mouthfuls of multiple-working modes can
Choosing.Microcontroller power supply is by accessory power supply through LDO output 3.3V power supplies.
The signal of PWM light modulators amplifies shaping, inputs the PWM3 feet of microcontroller through photoelectric coupler isolation, triode, leads to
The program for crossing AD conversion write-in is controlled：When built-in chip type Programmable detection is to there is the i.e. pwm signal change in duty cycle of light modulation action
When, the pwm signal frequency conversion of output, when light modulation, is reduced to 100Hz, for increasing the turn-on time in PWM duty cycle very little, leads
After the logical time becomes larger, the switch number of modulated main switch increases, and change rate becomes smaller, do not dim or dormant state under when liter
It is high to be used to reduce low-frequency ripple to 2KHz；The duty ratio of input detect and count in real time according to the requirement of dimming curve
It calculates, exports suitable duty cycle signals, be input to the PWM feet of BUCK decompression chips；Chip interior program is to busbar voltage simultaneously
It is detected, ensures that switching on and shutting down sequential is correct, prevent occurring LED flickers when switching on and shutting down.
Using the LED drive circuit of the utility model, converter technique can be used when designing program, so electric current when light modulation
Curve is very smooth, and range estimation dims phenomenon less than section；It is 2KHz when uncomfortable smooth, so only needing the electrolytic capacitor of low capacity that can obtain
Obtain ideal LED ripple current.
Description of the drawings
Fig. 1 is isolation flyback 0-10V dimming LED drive circuit figures.
Fig. 2 is non-isolated BUCK voltage-dropping types linearity light adjusting LED drive circuit figure.
Fig. 3 is that pwm signal driving metal-oxide-semiconductor opens shutdown LED circuit diagram.
Fig. 4 is a kind of circuit block diagram of efficient low ripple dimming LED drive circuit of the utility model.
Fig. 5 is the utility model BOOST APFC and high pressure BUCK auxiliary power supply circuit diagrams.
Fig. 6 is the BUCK decompression constant-current circuits of the utility model.
Fig. 7 is the utility model pwm signal electric operation control circuit figure.
Fig. 8 dims current waveform figure after improving.
Fig. 9 is 100Hz LED ripple current figures.
Figure 10 is 1 2KHz LED ripple current figures.
Figure 11 is actual measurement dimming curve.
Specific implementation mode
With reference to Fig. 4, a kind of efficient low ripple dimming LED drive circuit of utility model, including EMI filter circuit, rectification
Filter circuit, BOOST APFC circuits, BUCK decompressions constant-current circuit, pwm signal control circuit and high pressure BUCK auxiliary power supply electricity
Road, it is characterised in that：
The EMI filter circuit, input termination alternating current, output termination current rectifying and wave filtering circuit；
The current rectifying and wave filtering circuit, the output end of input termination EMI filter circuit, output termination BOOST APFC electricity
Road；
The BOOST APFC circuits, the output end of input termination current rectifying and wave filtering circuit, output termination BUCK decompressions
Constant-current circuit；
The output end and pwm signal control electricity of the input termination BOOST APFC circuits of the BUCK decompression constant-current circuits
The signal output end on road, output termination LED load；
The pwm signal control circuit, input termination PWM dim signals and BOOST APFC circuit outputs it is anti-
Feedback signal, output termination BUCK are depressured constant-current circuit；
The high pressure BUCK auxiliary power supply circuits, the output end of input termination BUCK decompression constant-current circuits, output
Terminate the power end of BOOST APFC circuits, BUCK decompressions constant-current circuit, pwm signal control circuit.
A kind of efficient low ripple dimming LED drive circuit of the utility model, the alternating current of AC90-264V are filtered through EMI
Circuit, by the DC voltage that bridge rectifier is pulsation, BOOST APFC circuits carry out PFC simultaneously to input current
Constant high voltage direct current is exported, constant electric current is exported to LED load through BUCK decompression constant-current circuits, exports average current
It is related with PWM dim signal duty ratios.Pwm signal control circuit is modulated PWM dim signals, and PWM dim signals is made to account for
Sky is than meeting the requirement of light modulation change curve with LED load curent change and handling a system of dimming process and switching on and shutting down inverse time sequence
Row problem.
High pressure BUCK auxiliary power supply circuits, working power is provided for each control circuit.
With reference to Fig. 5, the BOOST APFC circuit control chips use the power factor school of critical current operating mode
Positive chip MP44014, major function are：
Critical conduction mode PFC controls；
Accurate adjustable output over-voltage protection, FB open-circuit-protections；
Ultralow (15 μ A) starting current；
- 750 /+800mA driving currents.
The circuit has simple in structure, small, stable and reliable in work, PF values height, THD values low.Arteries and veins after bridge rectifier
Dynamic direct current essentially eliminates low-frequency ripple through the constant direct current 400V of BOOST APFC circuit outputs, ensures that late-class circuit is defeated
Low-frequency ripple electric current deal in the LED current gone out is within 5%, while the power factor of input circuit reaches 0.9 or more.
The high pressure BUCK auxiliary power supply circuit control chips use MP150 or MP170, and major function is：
Isobarically Control supports buck, buck-boost and flyback topology；
Built-in 700V MOSFET；
Internal high pressure current source；
Low standby power loss, output power is up to 2W；
Output current is up to 200mA；
SOT23-5 and SOIC8 encapsulation.
High voltage direct current 400V is converted to low-voltage direct 15V by high pressure BUCK auxiliary power supplies circuit, is quickly each control electricity
Road provides power supply, and the machine time of rising that LED drives is made to be less than 0.5 second.
Constant-current circuit is depressured with reference to Fig. 6, the BUCK to drive using the high-precision voltage-dropping type LED constant current of support PWM light modulations
Dynamic chip MP4700.Its major function is：
Operating voltage 8-18V, VCC under-voltage protection；
PWM brightness adjustment controls, light modulating frequency 100Hz-2KHz；
Maximum operating frequency is up to 160KHz；
Inlet highway under-voltage is protected；
Output short circuit protection, overheating protection；
External power MOS, gate drive current is up to 1.2A.
Basic functional principle is：+ 15V voltages access VIN feet, the VCC voltages of 8.5V are converted to through internal LDO, when straight
Stream busbar voltage is when reaching the setting voltage of chip I NUV feet, when metal-oxide-semiconductor Q8 conductings, input current through load LED, inductance L5,
Metal-oxide-semiconductor Q8, detection resistance R53 are flowed into ground.Inductive current linear rise at this time stores energy, when the voltage in detection resistance
Reach the detection voltage of chip CS feet, metal-oxide-semiconductor is closed, and inductive current is supplied together with capacitance EC3 for load LED by diode D7
Electricity, inductive current is from peak linear decline at this time, and the average value of inductive current is output current, i.e.,：ILED=1/2IL_PEAK.
BUCK chips PWM light modulation operation principle with introduce above, main circuit working frequency 100K, pwm signal is
1K, when pwm signal is high voltage, main circuit work, when pwm signal is low level, main circuit is closed, therefore PWM 1K letters
Number chip DRIVE feet driving 100K signals are modulated, change identical IPK electric currents by adjusting the duty ratio size of PWM
Under output waveform number, that is, average current size is changed, to realize light modulation.
With reference to Fig. 7, the signal of input is changed into required frequency conversion using microcontroller U3 and believed by the pwm signal control circuit
Number, then control BUCK circuits.The microcontroller major functions and features be high performance-price ratio, low pin small package, operating voltage range it is wide,
Support low-power consumption mode, internal reset, internal crystal oscillator frequency highest 25MHz, inner cryogenic drift coefficient, 1T instruction execution speeds,
High-speed sampling AD, 10BIT precision, I/O mouthful multiple-working mode are optional.Microcontroller power supply exports 3.3V by accessory power supply through LDO
Power supply.
The signal of PWM light modulators is isolated through photoelectrical coupler OP1, and triode Q3 amplifies shaping, inputs the PWM3 of microcontroller
Foot, the program being written by AD conversion are controlled：When built-in chip type Programmable detection is to there is the i.e. pwm signal duty ratio of light modulation action
When variation, the pwm signal frequency conversion of output, when light modulation, is reduced to 100Hz, when for increasing the conducting in PWM duty cycle very little
Between, after turn-on time becomes larger, the switch number of modulated main switch increases, and change rate becomes smaller, and does not dim or dormant state
2KHz will be increased to when lower for reducing low-frequency ripple；The duty ratio of input is detected in real time according to the requirement of dimming curve
And calculating, suitable duty cycle signals are exported, the PWM feet of BUCK decompression chips are input to；Chip interior program is to busbar simultaneously
Voltage is detected, and is ensured that switching on and shutting down sequential is correct, is prevented occurring LED flickers when switching on and shutting down.
From the 15V voltages of high pressure BUCK auxiliary power supply circuit outputs through analog voltage pressure regulation chip U2 be converted into 3V voltages to
Microcontroller U3 and photoelectrical coupler OP1 power supplies.The analog voltage pressure regulation chip U2 uses AZ1117-3.0 cake cores.
Using the LED drive circuit of the utility model, converter technique can be used when designing program, so electric current when light modulation
Curve is very smooth, and range estimation dims phenomenon less than section；It is 2KHz when uncomfortable smooth, so only needing the electrolytic capacitor of low capacity that can obtain
Obtain ideal LED ripple current.
Light modulation current waveform is as shown in Figure 8 after actual measurement improves.
LED ripple current is as shown in Figure 9 and Figure 10 when surveying light modulating frequency 100Hz and 2KHz.
The signal and isolated from power for making light modulator in circuit using photoelectrical coupler, are since the power supply of the utility model is
Non-isolated power supply, and dimmer signal is that low-voltage signal pwm signal transmission line is longer, is easy to be interfered；Single is supported simultaneously
Light modulator controls several or tens LED dimming lamps simultaneously.
Actual test result：
（1）PF:0.98/100VAC, 0.93/240VAC.（2）Efficiency：93.2% 230VAC.（3）0.38 second machine time is played,
230V is inputted.（4）Output ripple electric current 4.1%.（5）Dimming curve is as shown in figure 11.
A kind of efficient low ripple dimming LED drive circuit of utility model, main circuit use BOOST+BUCK schemes, will be defeated
The Width funtion entered is upgraded to fixed high pressure, then is depressured and realizes through BUCK, and dimming function is realized by BUCK and MCU circuits.Due to two-stage
Scheme realizes quickly to start and be contradicted with timing control, so design is used to busbar voltage real-time sampling, by it is rational when
Sequence control improves reliability, after allowing BOOST that voltage is risen to certain high pressure, then rear class BUCK is allowed to work, solves general BUCK
It is depressured constant-current circuit PWM light modulations institute inherent shortcoming.And different controls can be used according to the requirement of dimming curve and dimmer signal
The pwm signal of processing procedure ordered pair light modulator is modulated, and is made to make LED light brightness change homogeneous soft in dimming process, be reduced just
The ripple current of LED when normal lighting.
It is to be understood that：Above-described embodiment is the explanation to the utility model, rather than to the utility model
Limitation, any innovation and creation without departing from the utility model in essence scope each fall within the scope of protection of the utility model
Within.
Claims (9)
1. a kind of efficient low ripple dimming LED drive circuit, including EMI filter circuit, current rectifying and wave filtering circuit, BOOST APFC electricity
Road, BUCK decompressions constant-current circuit, pwm signal control circuit and high pressure BUCK auxiliary power supply circuits, it is characterised in that：
The EMI filter circuit, input termination alternating current, output termination current rectifying and wave filtering circuit；
The current rectifying and wave filtering circuit, the output end of input termination EMI filter circuit, output termination BOOST APFC circuits；
The BOOST APFC circuits, the output end of input termination current rectifying and wave filtering circuit, output termination BUCK are depressured constant current
Circuit；
The output ends of the input termination BOOST APFC circuits of the described BUCK decompressions constant-current circuit and pwm signal control circuit
Signal output end, output termination LED load；
The feedback letter of the pwm signal control circuit, input termination PWM dim signals and BOOST APFC circuit outputs
Number, output termination BUCK is depressured constant-current circuit；
The high pressure BUCK auxiliary power supply circuits, the output end of input termination BUCK decompression constant-current circuits, output termination
The power end of BOOST APFC circuits, BUCK decompressions constant-current circuit, pwm signal control circuit.
2. a kind of efficient low ripple dimming LED drive circuit as described in claim 1, it is characterised in that the BOOST APFC
The control chip of circuit uses the PFC chip of critical current operating mode.
3. a kind of efficient low ripple dimming LED drive circuit as claimed in claim 2, it is characterised in that the power factor
Correcting chip uses MP44014 cake cores.
4. a kind of efficient low ripple dimming LED drive circuit as described in claim 1, it is characterised in that the high pressure BUCK is auxiliary
The control chip of power supply circuit is helped to use MP150 or MP170 cake cores.
5. a kind of efficient low ripple dimming LED drive circuit as described in claim 1, it is characterised in that the BUCK decompressions are permanent
Current circuit is using the voltage-dropping type LED constant current driving chip for supporting PWM light modulations.
6. a kind of efficient low ripple dimming LED drive circuit as claimed in claim 5, it is characterised in that the voltage-dropping type LED
Constant-current driven chip is MP4700 cake cores.
7. a kind of efficient low ripple dimming LED drive circuit as described in claim 1, it is characterised in that the pwm signal
Control circuit includes microcontroller and photoelectrical coupler, the output end of the input termination photoelectrical coupler of the microcontroller, the list
The control signal of the output termination BUCK decompression constant-current circuits of piece machine；The input termination PWM light modulation letters of the photoelectrical coupler
Number, output end connects microcontroller.
8. a kind of efficient low ripple dimming LED drive circuit as claimed in claim 7, it is characterised in that the pwm signal
Control circuit further includes analog voltage pressure regulation chip.
9. a kind of efficient low ripple dimming LED drive circuit as claimed in claim 8, it is characterised in that the analog voltage
Pressure regulation chip uses AZ1117-3.0 cake cores.
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| CN109922585A (en) * | 2019-04-10 | 2019-06-21 | 宁波市星耀智能科技有限公司 | A kind of lighting control circuit |
| CN110149061A (en) * | 2019-05-24 | 2019-08-20 | 安徽师范大学 | The method for transformation of High Power Factor adjustable digital DC voltage source |
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| CN112867207A (en) * | 2021-02-19 | 2021-05-28 | 南京工业职业技术大学 | High-linearity TRIAC dimming compatible LED driving circuit |
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| CN109922585A (en) * | 2019-04-10 | 2019-06-21 | 宁波市星耀智能科技有限公司 | A kind of lighting control circuit |
| CN110149061A (en) * | 2019-05-24 | 2019-08-20 | 安徽师范大学 | The method for transformation of High Power Factor adjustable digital DC voltage source |
| CN111385937A (en) * | 2019-11-20 | 2020-07-07 | 宁波凯耀电器制造有限公司 | Miniaturized intelligent lamp |
| CN110729891A (en) * | 2019-11-27 | 2020-01-24 | 武汉市国扬科技集团有限公司 | Analog control circuit of optical switch |
| CN112996186A (en) * | 2019-12-18 | 2021-06-18 | 安徽展晖电子科技有限公司 | Pulse-controlled circuit unit, drive circuit, integrated circuit and lighting device |
| CN114585127A (en) * | 2020-11-30 | 2022-06-03 | 松下电气机器（北京）有限公司 | Control circuit for LED lighting device |
| CN114585127B (en) * | 2020-11-30 | 2023-11-24 | 松下电气机器（北京）有限公司 | Control circuit for LED lighting device |
| CN112867207A (en) * | 2021-02-19 | 2021-05-28 | 南京工业职业技术大学 | High-linearity TRIAC dimming compatible LED driving circuit |
| CN113015290A (en) * | 2021-03-31 | 2021-06-22 | 上海新进芯微电子有限公司 | Linear LED drive circuit |
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Address after: No. 656, Tongde Road, Tongxiang City, Jiaxing City, Zhejiang Province 314500 Patentee after: Zhejiang Yuyang Electronics Co., Ltd. Address before: No. 656, Tongde Road, Tongxiang City, Jiaxing City, Zhejiang Province 314500 Patentee before: ZHEJIANG YUYANG ELECTRONICS CO.,LTD. |