CN105722278B - A kind of control circuit, control method and the LED drive system of improvement LED dimming behaviors - Google Patents
A kind of control circuit, control method and the LED drive system of improvement LED dimming behaviors Download PDFInfo
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- CN105722278B CN105722278B CN201610221479.0A CN201610221479A CN105722278B CN 105722278 B CN105722278 B CN 105722278B CN 201610221479 A CN201610221479 A CN 201610221479A CN 105722278 B CN105722278 B CN 105722278B
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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]
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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]
- H05B45/10—Controlling the intensity of the light
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides open-circuit-protection control circuit, control method and the LED drive system of a kind of improvement LED dimming behaviors.The open-circuit-protection control circuit of the improvement LED dimming behaviors includes：LED open-circuit-protections module is used to be compared system demagnetization time signal with reference data time signal, when the system demagnetization time being less than the reference data time, exports an effective initial open circuit protection signal；Inductive current control module, for the inductor current value of detecting system, when the inductor current value is more than given threshold, exports a current controling signal；Synchronization control module, for when receiving system demagnetization end signal, after setting time, control open circuit to enable invalidating signal；When receiving the current controling signal, the open circuit is controlled to enable signal effective；When the initial open circuit protection signal and the open circuit enable signal while when effective, exporting an open-circuit-protection signal.The present invention is avoided that LED flashing lights.
Description
Technical field
The present invention relates to a kind of LED control fields, more particularly to a kind of control circuit of improvement LED dimming behaviors, control
Method and LED drive system processed.
Background technology
Promotion energetically with country to energy-conserving and environment-protective, LED illumination is as a kind of new technology, with green, energy-conservation, environmental protection
The characteristics of and be widely popularized.With the deep development of LED illumination technology, the demand of various intelligent lighting controls is more and more,
Including switch on wall light modulation, or 2.4G is used, bluetooth, zigbee, wifi, the intelligent lighting of the controlled in wireless such as infrared is in
The eve of explosion type development.The development of these intelligent lighting demands also requires that the LED drive control circuits for LED illumination simultaneously
Can these compatible wireless control modules, the demand of various intelligent dimmings can be realized.Current existing LED drive controls circuit
It is difficult to be capable of the control of compatible various intelligent wireless controllers, during light modulation, LED flashing lights are easily caused, client is made
Into very bad light modulation experience.
In consideration of it, how to determine to cause the reason for LED glistens and find the effective scheme for solving LED flashes of light just into ability
Field technique personnel's urgent problem to be solved.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of improvement LED dimming behaviors
Circuit, control method and LED drive system are controlled, for solving control in the prior art in various intelligent wireless controllers
During light modulation, the problem of easily causing LED flashing lights.
In order to achieve the above objects and other related objects, the present invention provides a kind of open-circuit-protection of improvement LED dimming behaviors
Circuit is controlled, the open-circuit-protection control circuit of the improvement LED dimming behaviors includes：LED open-circuit-protection modules, the LED is opened
Road protection module is used to be compared system demagnetization time signal with reference data time signal, is less than when the system demagnetization time
During the reference data time, an effective initial open circuit protection signal is exported；Inductive current control module, for detecting system
Inductor current value, when the inductor current value is more than given threshold, exports a current controling signal；Synchronization control module,
For when receiving system demagnetization end signal, after setting time, control open circuit to enable invalidating signal；When receiving
The current controling signal, controls the open circuit to enable signal effective；When the initial open circuit protection signal and the open circuit make
When energy signal is simultaneously effective, an open-circuit-protection signal is exported.
Alternatively, the synchronization control module includes the rest-set flip-flop of a high level triggering, and the system demagnetization terminates
Signal is input to the R ends of the rest-set flip-flop after delay circuit, and the current controling signal is input to the rest-set flip-flop
S ends, the Q ends output open circuit of the rest-set flip-flop enables signal.
Alternatively, the synchronization control module includes one and door, and the initial open circuit protection signal and the open circuit make
Energy signal inputs two inputs with door, the output end output open circuit protection signal with door respectively.
Alternatively, the given threshold is K times of peak current value, 0<K<=1.
The present invention provides a kind of LED drive system, and the LED drive system includes improvement LED light modulation property as described above
The open-circuit-protection control circuit of energy.
Alternatively, the LED drive system also includes LED constant current control module, and the LED constant current control module is used to work as
When receiving the open-circuit-protection signal of the open-circuit-protection control circuit output, the power supply of the LED drive system is restarted.
Alternatively, the LED drive system is additionally operable to receive pulse width modulating signal, when the pulse width received is adjusted
When signal processed is high level, the LED drive system normal work；When the pulse width modulating signal received is low level
When, the LED drive system is stopped.
Alternatively, the pulse width modulating signal is generated by wireless control system.
The present invention provides a kind of open-circuit-protection control method of improvement LED dimming behaviors, the improvement LED dimming behaviors
Open-circuit-protection control method includes：The inductor current value of detecting system, when the inductor current value is more than setting value, control is opened
It is effective that road enables signal；When detecting system demagnetization end signal, letter is enabled after setting time, controlling the open circuit
It is number invalid；When the system demagnetization time being less than the reference data time, an effective initial open circuit protection signal is produced；When described
When open circuit enables signal and simultaneously effective initial open circuit protection signal, an open-circuit-protection signal is produced.
Alternatively, the open-circuit-protection control method of the improvement LED dimming behaviors also includes：The open-circuit-protection signal control
LED processed power supply is restarted.
As described above, control circuit, control method and the LED drivetrains of a kind of improvement LED dimming behaviors of the present invention
System, has the advantages that：It can effectively reduce or avoid the LED open-circuit-protections signal in LED drive system from being missed
Triggering, so as to avoid the LED flashing lights caused by LED open-circuit-protections signal error is triggered.
Brief description of the drawings
Fig. 1 is shown as the module diagram of an embodiment of the LED drive system of prior art.
Fig. 2 is shown as the signal waveform schematic diagram of an embodiment of the LED drive system of prior art.
Fig. 3 is shown as the module diagram of an embodiment of the control circuit of the improvement LED dimming behaviors of the present invention.
Fig. 4 is shown as the synchronization control module of an embodiment of the control circuit of the improvement LED dimming behaviors of the present invention
Circuit theory schematic diagram.
Fig. 5 is shown as the module diagram of an embodiment of the LED drive system of the present invention.
Fig. 6 is shown as the signal waveform schematic diagram of an embodiment of the LED drive system of the present invention.
Fig. 7 is shown as the schematic flow sheet of an embodiment of the control method of the improvement LED dimming behaviors of the present invention.
Component label instructions
1 improves the control circuit of LED dimming behaviors
11 LED open-circuit-protection modules
12 inductive current control modules
13 synchronization control modules
S1~S4 steps
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only to coordinate specification to be taken off
The content shown, so that those skilled in the art is understood with reading, is not limited to enforceable qualifications of the invention, therefore
Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influenceing the present invention
Under the effect that can be generated and the purpose that can reach, it all should still fall the model that can cover in disclosed technology contents
In enclosing.Meanwhile, the term of cited such as " on ", " under " in this specification, "left", "right", " centre " and " one " is also only
It is easy to understanding for narration, and is not used to limit enforceable scope of the invention, its relativeness is altered or modified, without essence
Change under technology contents, when being also considered as enforceable category of the invention.
As shown in figure 1, a typical intelligent LED lighting system with wireless controller includes：Wireless control system
With the big module of LED drive system two, wherein wireless control system is according to the control of user, output pulse width modulation control signal
(PWM) LED drive system is arrived, LED is dimmed.Pulse width modulation control signal (PWM) realizes that the principle of light modulation is：When
When PWM is high level, LED drive system normal work, when PWM is low level, PWM closes grid drive signal Ngate, LED
Drive system is stopped.
LED drive system includes connecting the rectifier bridge filtration module of alternating voltage, energy-storage module, LED load, Power Control
Switch module, inductance peak value comparison method module, LED open-circuit-protections module, zero current detection module and LED constant current control mould
Block.
Wherein alternating voltage is shaped to an approximate DC voltage, energy-storage module and power control by rectifier bridge filtration module
The power tube controlled stage of switch module formation whole system processed, wherein multiple power level framework can be included, including Buck,
Buck-Boost, or flyback etc., wherein the inductor current signal in energy-storage module is IL.Inductance peak value comparison method mould
The function of block is the peak point current for controlling inductance, by detecting on the current sense resistor in inductance peak value comparison method module
Voltage signal Vcs, and feed back a peak-current signal CS_Peak.The function of zero electro-detection module is the demagnetization of detecting system
Point, when inductive current, which drops to zero, reaches de-magnetization point, output demagnetization end signal ZXC and system demagnetization time signal Tdmeg.
The function of LED open-circuit-protection modules is system demagnetization time (Tdmeg) and reference for exporting zero electro-detection module
Fiducial time (Tovp) compares to realize LED open-circuit-protections, and main output signal is open-circuit-protection signal OVP.LED constant current is controlled
The function of module is to receive demagnetization end signal ZXC, peak-current signal CS_Peak, open-circuit-protection signal OVP, and pulse
Bandwidth modulation signals PWM, the control signal Ngate of output power switch module, realize that LED current constant control and switch are adjusted
Photocontrol.LED constant current control module compares open-circuit-protection reference time signal Tovp and demagnetization time signal Tdemg simultaneously, enters
The open-circuit-protection of row system.In normal work, the LED drivetrains of critical current mode pattern or discontinuous mode are operated in
Demagnetization time Tdmeg=(L*Ipk)/Vled of system.Wherein Vled represents load voltage, and Ipk represents the inductance in energy-storage module
Peak point current, L represents the inductance value in energy-storage module.When load voltage Vled is constant, the demagnetization time of system is also to maintain
Constant, when load voltage Vled is raised, the demagnetization time (Tdmeg) of system will synchronously diminish, therefore LED constant current control module can
Compared to realize LED open-circuit-protections with the reference data time (Tovp) with the demagnetization time (Tdmeg) by comparison system.
Signal waveform in above-mentioned LED drive system is as shown in Fig. 2 wherein, the pulse exported due to wireless control system
The grid drive signal Ngate's that width modulated control signal PWM is exported with LED control circuit module in LED drive system is random
Property and independence.Cause A points and B points in fig. 2, grid drive signal Ngate can in advance be closed by pulse width modulating signal PWM
Close, cause system demagnetization time (Tdmeg) mistake be less than the reference data time (Tovp).Driven so as to the triggering LED of mistake
LED open-circuit-protections OVP in dynamic system.OVP signals control LED drive system restarts LED power, so as to cause LED sudden strains of a muscle occur
Lamp.
For the LED flashing lights caused by the erroneous trigger of open-circuit-protection signal, the present invention provides a kind of LED that improves and dims property
The open-circuit-protection control circuit of energy, improving the open-circuit-protection control circuit of LED dimming behaviors is used to lower or avoid wrong generation
Open-circuit-protection signal.As shown in figure 3, the open-circuit-protection control circuit of the improvement LED dimming behaviors includes LED open-circuit-protections
Module 11, inductive current control module 12 and synchronization control module 13.Wherein：
LED open-circuit-protections module 11 is used to be compared system demagnetization time signal with reference data time signal, when
When the system demagnetization time is less than the reference data time, an effective initial open circuit protection signal is exported.
Inductive current control module 12 is used for the inductor current value of detecting system, when the inductor current value is more than setting threshold
During value, a current controling signal is exported.The given threshold is K times of peak current value, wherein, 0<K<=1.
Synchronization control module 13 is connected with LED open-circuit-protections module 11 and inductive current control module 12, is connect for working as
When receiving system demagnetization end signal, after setting time, control open circuit enables invalidating signal；When receiving the electric current
Control signal, controls the open circuit to enable signal effective；When the initial open circuit protection signal and open circuit enable signal are same
During Shi Youxiao, an open-circuit-protection signal is exported.In one embodiment, the synchronization control module is touched including a high level
The rest-set flip-flop of hair, the system demagnetization end signal is input to the R ends of the rest-set flip-flop, the electricity after delay circuit
Flow control signals are input to the S ends of the rest-set flip-flop, and the Q ends output open circuit of the rest-set flip-flop enables signal.The synchronization
Control module includes one and door, and the initial open circuit protection signal and the open circuit enable signal and input described and door respectively
Two inputs, the output end output open circuit protection signal with door.
In one embodiment, as shown in figure 4, the synchronization control module includes the rest-set flip-flop of a high level triggering
(I1) and one with door (I2), system demagnetization end signal ZXC becomes signal ZXC_ after delay circuit (delay)
The R ends of the rest-set flip-flop I1 are input to after dly, the current controling signal (K*CS_Peak) is input to the rest-set flip-flop
(I1) S ends, the Q ends output open circuit of the rest-set flip-flop (I1) enables signal (OVP_EN).The initial open circuit protection signal
(OVP) enable signal (OVP_EN) with the open circuit and input two inputs with door (I2) respectively, it is described with door (I2)
Output end output open circuit protection signal (OVP_pst).
The present invention provides a kind of LED drive system, and the LED drive system includes improvement LED light modulation property as described above
The open-circuit-protection control circuit of energy.In one embodiment, the LED drive system also includes LED constant current control module, described
LED constant current control module is used for when receiving the open-circuit-protection signal of the open-circuit-protection control circuit output, and the LED drives
The power supply of dynamic system is restarted.In one embodiment, the LED drive system is additionally operable to receive pulse width modulating signal, when
When receiving pulse width modulating signal for high level, LED drive system normal work；When receiving pulse width modulating signal
During for low level, LED drive system is stopped.The pulse width modulating signal is generated by wireless control system.
In one embodiment, as shown in figure 5, the LED drive system includes the rectifier bridge filtering of connection alternating voltage
Module, energy-storage module, LED load, power control switching module, inductance peak value comparison method module, zero electro-detection module and
LED constant current control module, LED open-circuit-protections module, inductive current control module, synchronization control module.Wherein, inductive current control
The purpose of molding block is：One current controling signal K*CS_Peak, wherein K scope 0 are exported according to the size of inductive current<k
<=1.The purpose of synchronization control module is：The open-circuit-protection signal OVP that LED open-circuit-protections module is exported and inductive current control
The current controling signal K*CS_Peak of molding block output synchronizes control, it is possible to prevente effectively from the LED in LED drive system
Open-circuit-protection OVP is caused LED flashing lights by false triggering.OVP can be avoided is by the principle of false triggering：By detecting inductive current
After the current controling signal K*CS_Peak of control module output, the inductive current for only having reached setting, the open-circuit-protection of triggering
Signal OVP is considered as just correct OVP guard modes.The input signal of synchronization control module includes：Zero electro-detection module is defeated
Zero power detection signal ZXC, the LED open-circuit-protection module output initial signal OVP gone out, the signal contains mistake and correct
Open-circuit-protection state, and inductive current control module output inductive current control signal K*CS_Peak.Output signal is
The later open-circuit-protection signal OVP_pst of Synchronization Control.
Signal waveform in above-mentioned LED drive system is as shown in fig. 6, wherein, due to the RS triggerings in synchronization control module
Device is resetted by the demagnetization signal ZXC in the previous cycle, and it is low level that the open-circuit-protection of output, which enables signal OVP_EN, due to grid
Drive signal Ngate is closed in advance by pulse width modulating signal PWM, is not reaching to the inductor current value of setting, is caused K*CS_
Peak is low level.So it is always low level that open-circuit-protection, which enables signal OVP_EN, so as to shield the open-circuit-protection of mistake
Signal OVP, therefore synchronization control module shields the wrong open-circuit-protection signal of A points and the output of B points.In C points, due to inductance electricity
Flow control module has reached the inductor current value of setting, and K*CS_Peak is high level, therefore open-circuit-protection enables signal OVP_EN
High level is set to, normal open circuit protecting function is realized, OVP_pst is high level.
The present invention provides a kind of open-circuit-protection control method of improvement LED dimming behaviors, in one embodiment, such as Fig. 7
Described, the open-circuit-protection control method of the improvement LED dimming behaviors includes：
Step S1, the inductor current value of detecting system, when the inductor current value is more than setting value, control open circuit is enabled
Signal is effective.
Step S2, when detecting system demagnetization end signal, letter is enabled after setting time, controlling the open circuit
It is number invalid.
Step S3, when the system demagnetization time being less than the reference data time, produces an effective initial open circuit protection letter
Number.
Step S4, when the open circuit enables signal and simultaneously effective initial open circuit protection signal, produces one and opens
Road protection signal.
Wherein, step S1, S2, S3 is independent of one another, according to specific circuit realiration.Step S1, S2, S3 implementing result are determined
Step S4 output result is determined.In one embodiment, the open-circuit-protection control method of the improvement LED dimming behaviors is also wrapped
Include：The power supply of the open-circuit-protection signal control LED is restarted.
In summary, control circuit, control method and the LED drivetrains of a kind of improvement LED dimming behaviors of the invention
System can effectively reduce or avoid the LED open-circuit-protection signals in LED drive system by false triggering, so as to avoid because of LED
LED flashing lights caused by the triggering of open-circuit-protection signal error.So, the present invention effectively overcome various shortcoming of the prior art and
Has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
1. the open-circuit-protection control circuit of a kind of improvement LED dimming behaviors, it is characterised in that the improvement LED dimming behaviors
Open-circuit-protection control circuit includes：
LED open-circuit-protection modules, the LED open-circuit-protections module is used for demagnetized to system time signal and reference data time letter
Number it is compared, when the system demagnetization time being less than the reference data time, the effective initial open circuit guarantor of output one
Protect signal；
Inductive current control module, for the inductor current value of detecting system, when the inductor current value is more than given threshold,
Export a current controling signal；
Synchronization control module, for when receiving system demagnetization end signal, after setting time, control open circuit to be enabled
Invalidating signal；When receiving the current controling signal, the open circuit is controlled to enable signal effective；When initial open circuit protection
Signal and the open circuit enable signal while when effective, exporting an open-circuit-protection signal.
2. the open-circuit-protection control circuit of improvement LED dimming behaviors according to claim 1, it is characterised in that：It is described same
Walking control module includes the rest-set flip-flop of a high level triggering, and the system demagnetization end signal is inputted after delay circuit
To the R ends of the rest-set flip-flop, the current controling signal is input to the S ends of the rest-set flip-flop, the Q ends of the rest-set flip-flop
Output open circuit enables signal.
3. the open-circuit-protection control circuit of improvement LED dimming behaviors according to claim 1, it is characterised in that：It is described same
Walking control module includes one and door, and the initial open circuit protection signal and the open circuit enable signal and input described and door respectively
Two inputs, the output end output open circuit protection signal with door.
4. the open-circuit-protection control circuit of improvement LED dimming behaviors according to claim 1, it is characterised in that：It is described to set
It is K times of peak current value, 0 to determine threshold value<K<=1.
5. a kind of LED drive system, it is characterised in that：The LED drive system is included such as any right in Claims 1-4
It is required that the open-circuit-protection control circuit of described improvement LED dimming behaviors.
6. LED drive system according to claim 5, it is characterised in that：The LED drive system also includes LED constant current
Control module, the LED constant current control module is used for when the open-circuit-protection letter for receiving the open-circuit-protection control circuit output
Number when, the power supply of the LED drive system is restarted.
7. LED drive system according to claim 5, it is characterised in that：The LED drive system is additionally operable to receive pulse
Bandwidth modulation signals, when the pulse width modulating signal received is high level, the LED drive system normal work；When
When the pulse width modulating signal received is low level, the LED drive system is stopped.
8. LED drive system according to claim 7, it is characterised in that：The pulse width modulating signal passes through wireless
Control system is generated.
9. a kind of open-circuit-protection control method of improvement LED dimming behaviors, it is characterised in that：The improvement LED dimming behaviors
Open-circuit-protection control method includes：
The inductor current value of detecting system, when the inductor current value is more than setting value, it is effective that control open circuit enables signal；
When detecting system demagnetization end signal, invalidating signal is enabled after setting time, controlling the open circuit；
When the system demagnetization time being less than the reference data time, an effective initial open circuit protection signal is produced；
When the open circuit enables signal and simultaneously effective initial open circuit protection signal, an open-circuit-protection signal is produced.
10. the open-circuit-protection control method of improvement LED dimming behaviors according to claim 9, it is characterised in that：It is described to change
The open-circuit-protection control method of kind LED dimming behaviors also includes：The power supply of the open-circuit-protection signal control LED is restarted.
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| CN201610221479.0A CN105722278B (en) | 2016-04-11 | 2016-04-11 | A kind of control circuit, control method and the LED drive system of improvement LED dimming behaviors |
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| CN109068454B (en) * | 2018-10-30 | 2024-06-14 | 无锡恒芯微科技有限公司 | Improved PWM and DIM dimming driving circuit |
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| US9307588B2 (en) * | 2012-12-17 | 2016-04-05 | Ecosense Lighting Inc. | Systems and methods for dimming of a light source |
| TWM469624U (en) * | 2013-10-04 | 2014-01-01 | Unity Opto Technology Co Ltd | LED driving device with open-lamp protection and adjustable color temperature and brightness properties |
| CN205622924U (en) * | 2016-04-11 | 2016-10-05 | 上海晶丰明源半导体有限公司 | Improve LED adjust luminance open circuit protection control circuit and LED actuating system of performance |
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| CN103179751A (en) * | 2013-03-08 | 2013-06-26 | 上海晶丰明源半导体有限公司 | LED driving circuit capable of realizing complete-period sampling of inductive current |
| CN203233150U (en) * | 2013-04-22 | 2013-10-09 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED drive power supply and LED drive power supply |
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