CN109496009B - A kind of feedback loop compensation switching circuit and driving power - Google Patents
A kind of feedback loop compensation switching circuit and driving power Download PDFInfo
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- CN109496009B CN109496009B CN201811167725.4A CN201811167725A CN109496009B CN 109496009 B CN109496009 B CN 109496009B CN 201811167725 A CN201811167725 A CN 201811167725A CN 109496009 B CN109496009 B CN 109496009B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter 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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- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to a kind of feedback loop compensation switching circuit and driving powers, including the feedback control circuit for accessing multiple feedback loop compensation switching modules of input signal and connecting with multiple feedback loop compensation switching modules；Each feedback loop compensation switching module includes accessing input signal and exporting the signal deteching circuit of detection signal, generate the voltage reference circuit of reference voltage, the comparison circuit connecting with signal deteching circuit and voltage reference circuit, the controlled switch connecting with comparison circuit and the first loop compensation circuit and the second loop compensation circuit connecting with controlled switch.The present invention is using classification loop compensation, change traditional frequency conversion feedback control circuit only use one at a slow speed compensation loop be adapted to its very wide operating frequency range, frequency conversion feedback control circuit is set to have different loop compensation response speeds in different working frequencies, it solves LED lamp and the flicker problem of human viewable occurs, while promoting the stability and reliability to work under different loads.
Description
Technical field
The present invention relates to the technical fields of driving power, more specifically to a kind of feedback loop compensation switching circuit
And driving power.
Background technique
The control mode of power supply unit generally has fixed frequency and variable frequency control, i.e., usually said PWM control
Mode (pulse width duty ratio modulation mode) and PFM (variable frequency modulation mode).In the switch type power supplying of LED light source
In order to improve its efficiency in device, more Sofe Switch control mode, that is, PFM is generally used, such as: half-bridge resonance topology and standard
Resonance reverse exciting topological.Although these topologys bring the promotion of efficiency, its biggish operating frequency range is anti-to loop
Feedback compensation brings difficulty, such as its operating frequency range is generally 40KHz to 200KHz, and 5 times of frequency range is difficult
Loop feedback compensation circuit is allowed effectively to work in full frequency band.It is needed especially for the switch type power supplying device of LED light source
It applies in various brightness adjustment control modes, such as: the light modulation of 0-10V direct current, the light modulation of 0-100% duty ratio or other light modulation sides
Formula.When dimming mode exports relatively low signal, such as when the setting of direct current dim signal is to 1.5V, the output of switch mode power
Electric current becomes unstable, shows themselves in that human eye occur can see that obvious flashing on the h of LED lamp.
When analyzing reason under very low dim signal, the switch type power supplying device of LED light source has reached highest
Working frequency, and the compensation of its loop feedback generally be directed to peak power output come optimization design (benefit be improve it is maximum defeated
Stability when power out), usually there are minimum working frequency, therefore loop feedback compensation response speed in peak power output
Spend slow, this loop response speed at a slow speed does not track LED control device in very low dim signal most
High working frequency causes power supply device to be in unstable working condition.
Therefore, existing LED drive power at LED drive power external dimmer control when, due to working frequency model
Enclose it is bigger, increase compensating feedback loop design and debugging difficulty, while also reduce LED drive power reliability and
Stability.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of feedback control loop benefit
Repay switching circuit and driving power.
The technical solution adopted by the present invention to solve the technical problems is: a kind of feedback loop compensation switching circuit is constructed,
Applied to driving power, comprising: access input signal multiple feedback loop compensation switching modules and with the multiple feedback loop
Road compensates the frequency conversion control circuit of switching module connection；
Each described feedback loop compensation switching module includes: the access input signal and the letter for exporting detection signal
Number detection circuit, the voltage reference circuit for generating reference voltage, with the signal deteching circuit and voltage reference electricity
Comparison circuit, the controlled switch being connect with the comparison circuit and the first loop being connect with the controlled switch of road connection
Compensation circuit and the second loop compensation circuit；
The comparison circuit is used to for the voltage of the detection signal being compared with the reference voltage, and according to comparing
As a result the controlled switch on or off is controlled, to gate first loop compensation circuit or second loop compensation
Circuit, and then keep the feedback control circuit defeated according to first loop compensation circuit or second loop compensation circuit
Thermal compensation signal is to the frequency conversion control circuit out.
In one of the embodiments, the signal deteching circuit include: the first bleeder circuit and with described first point
The filter circuit of volt circuit connection；
Wherein, the first end access input signal of first bleeder circuit, the second of first bleeder circuit
End connects the first input end of the comparison circuit.
The voltage reference circuit includes: the second bleeder circuit in one of the embodiments,；
The first end of second bleeder circuit connects power supply signal, described in the second end connection of second bleeder circuit
Second input terminal of comparison circuit.
The voltage reference circuit includes: reference voltage generator and current-limiting circuit in one of the embodiments,；
The first end of the current-limiting circuit connects power supply signal, and the second end of the current-limiting circuit connects the reference voltage
The first end and second end of generator, the second end of the reference voltage generator are also connected with the second input of the comparison circuit
End, reference voltage generator third end ground connection.
The comparison circuit includes: voltage comparator in one of the embodiments,；
The noninverting input of the voltage comparator connects the signal deteching circuit, the voltage comparator it is reversed defeated
Enter end and connect the voltage reference circuit, the output end of the voltage comparator connects the controlled switch.
The controlled switch includes photoelectrical coupler or relay in one of the embodiments,.
In one of the embodiments, first loop compensation circuit include: controlled switch conducting control unit and
First RC circuit；
After the conducting control unit of the controlled switch is connected with the first RC circuit, then access the feedback control circuit
Feedback control loop.
Second loop compensation circuit includes: the 2nd RC circuit in one of the embodiments,；
The 2nd RC circuit is serially connected on the feedback control loop of the feedback control circuit.
The multiple feedback loop compensation switching module is connected in parallel in one of the embodiments,.
The present invention also provides a kind of driving powers, including above-described feedback loop compensation switching circuit.
Implement feedback loop compensation switching circuit of the invention, has the advantages that including access input signal
Multiple feedback loop compensation switching modules and the frequency conversion control circuit being connect with multiple feedback loop compensation switching modules；Each
Feedback loop compensation switching module includes accessing input signal and exporting the signal deteching circuit of detection signal, generate reference voltage
Voltage reference circuit, connect with signal deteching circuit and voltage reference circuit comparison circuit, connect with comparison circuit by
The first loop compensation circuit and the second loop compensation circuit control switch and connect with controlled switch.The present invention is using classification loop
Compensation, change traditional frequency conversion feedback control circuit only use one at a slow speed compensation loop be adapted to its very wide working frequency model
It encloses, frequency conversion feedback control circuit is made to have different loop compensation response speeds in different working frequencies, solve LED lamp and go out
The flicker problem of existing human viewable, while promoting the stability and reliability to work under different loads.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of structural schematic diagram of feedback loop compensation switching circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of single feedback loop compensation switching module provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of single feedback loop compensation switching module provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is a kind of structural schematic diagram of feedback loop compensation switching circuit provided in an embodiment of the present invention with reference to Fig. 1.This is anti-
Feedback loop compensation switching circuit can be applied to the LED drive power using variable frequency shaping modes.
As shown in Figure 1, multiple feedback loop compensations that the feedback loop compensation switching circuit includes: access input signal are cut
Mold changing block 100 and the frequency conversion control circuit 200 being connect with multiple feedback loop compensation switching modules 100.Wherein, input signal can
Think the feedback signal of dim signal or frequency conversion control circuit 200.It can be by a resistance or conducting wire by dim signal
Or the feedback signal of frequency conversion control circuit 200 accesses signal deteching circuit 11.Here dim signal can be by external light modulation
Circuit provide, wherein external dimmer circuit include but is not limited to electric current light adjusting circuit, PWM light adjusting circuit, resistance light adjusting circuit or
The light adjusting circuit of other dimming modes of person.Frequency conversion control circuit 200 is the main control circuit inside driving power.
Each feedback loop compensation switching module 100 includes multiple and different loop compensation circuit, wherein each is anti-
Feedback loop compensation switching module 100 for gating different loop compensation circuits, feedback control circuit according to input signal automatically
17 export corresponding thermal compensation signal to frequency conversion control circuit 200, frequency conversion control circuit 200 according to the loop compensation circuit gated
It is adjusted accordingly according to the received thermal compensation signal of institute, so as to improve stability of the driving power in maximum operation frequency.
As shown in Figure 1, the feedback loop compensation switching circuit can be in parallel by multiple feedback loop compensation switching modules 100
Composition, thus formed it is being made of multiple feedback loop compensation switching modules 100 and by control mode, to reach classification adjustment pair
Answer the loop compensation parameter of different operating frequency.
It can be according to the anti-of dim signal or frequency conversion control circuit 200 by the way that the feedback loop compensation switching circuit is arranged
The response speed of the loop control of the size automatic classification adjustment driving power of feedback signal, automatically according to dim signal or frequency conversion
The size of the feedback signal of control circuit 200 switches different loop compensation circuits, to improve driving power in maximum functional frequency
Stability when rate, the thorough switching regulator driving power for solving the problems, such as LED light source LED light in light modulation flash.
It is the structural schematic diagram of single feedback loop compensation switching module 100 provided in an embodiment of the present invention with reference to Fig. 2.
As shown in Fig. 2, each feedback loop compensation switching module 100 includes: access input signal and exports detection letter
Number signal deteching circuit 11, the voltage reference circuit 12 for generating reference voltage, with signal deteching circuit 11 and voltage base
Comparison circuit 13 that quasi- circuit 12 connects, the controlled switch 14 being connect with comparison circuit 13 and connect with controlled switch 14 the
It one loop compensation circuit 15 and the second loop compensation circuit 16 and is mended respectively with the first loop compensation circuit 15 and the second loop
It repays circuit 16 and connects feedback control circuit 17.
Comparison circuit 13 is used to will test the voltage of signal and be compared with reference voltage, and according to comparison result control by
14 on or off of switch is controlled, to gate the first loop compensation circuit 15 or the second loop compensation circuit 16, and then makes to feed back
Control circuit 17 exports corresponding thermal compensation signal according to the first loop compensation circuit 15 or the second loop compensation circuit 16.
Here, the first loop compensation circuit 15 is the slower loop compensation circuit of response speed, the second loop compensation circuit
16 be the faster loop compensation circuit of response speed.
Reference voltage caused by voltage reference circuit 12 is the reference voltage for reacting input signal size.Work as detection
When the voltage of signal is less than reference voltage, illustrate the feedback signal of dim signal or frequency conversion control circuit 200 already below pre-
If threshold value, it is meant that frequency conversion control circuit 200 enters maximum operation frequency state, needs to select faster loop response speed
The loop compensation circuit of degree gates the second loop compensation circuit 16；When the voltage for detecting signal is greater than reference voltage, explanation
The feedback signal for dimming dim signal or frequency conversion control circuit 200 is greater than preset threshold value, and frequency conversion control circuit 200 is suitable for
The loop compensation circuit of slow-response speed.
In the embodiment of the present invention, the signal deteching circuit 11 include: the first bleeder circuit 111 and with the first bleeder circuit
The filter circuit 112 of 111 connections.Wherein, the first end of the first bleeder circuit 111 accesses input signal, the first bleeder circuit 111
Second end connection comparison circuit 13 first input end.
First bleeder circuit 111 can be connected to divide by multiple resistance and be realized.Wherein, the quantity and resistance value of resistance need root
It is determined according to physical circuit, the present invention is not especially limited.The filter circuit 112 can be realized by capacitor.
In the embodiment of the present invention, which includes: the second bleeder circuit.Wherein, second bleeder circuit
First end connects power supply signal, the second input terminal of the second end connection comparison circuit 13 of the second bleeder circuit.
Here, the second bleeder circuit can also be connected by multiple resistance and be realized.Wherein, the quantity and resistance value of resistance need basis
Physical circuit determines that the present invention is not especially limited.
Alternatively, the voltage reference circuit 12 includes: reference voltage generator 122 and current limliting in some other embodiment
Circuit 121.
The first end of current-limiting circuit 121 connects power supply signal, and the second end of current-limiting circuit 121 connects reference voltage generator
122 first end and second end, the second end of reference voltage generator 122 are also connected with the second input terminal of comparison circuit 13, base
Quasi- 122 third end of voltage generator ground connection.Wherein, reference voltage generator 122 can use TL431, it will of course be understood that
Ground, reference voltage generator 122 can also have same functionally voltage generator using other.Current-limiting circuit 121 can lead to
Cross resistance realization.
In the embodiment of the present invention, which includes: voltage comparator.
The reverse input end of the noninverting input connection signal detection circuit 11 of voltage comparator, voltage comparator connects electricity
Reference circuit 12 is pressed, the output end of voltage comparator connects controlled switch 14.Wherein, the noninverting input of voltage comparator be than
Compared with the first input end of circuit 13, the reverse input end of voltage comparator is the second input terminal of comparison circuit 13, and voltage compares
The output end of device is the output end of comparison circuit 13.
In the embodiment of the present invention, which includes photoelectrical coupler or relay.
In the embodiment of the present invention, which includes: the conducting control unit and of controlled switch 14
One RC circuit.
After the conducting control unit of controlled switch 14 is connected with the first RC circuit, then access the feedback loop of feedback control circuit 17
Road.Wherein, the first loop compensation circuit 15 of the conducting control unit of controlled switch 14 and the first RC circuit composition is response speed
Slower loop compensation circuit.
In the embodiment of the present invention, which includes: the 2nd RC circuit.2nd RC circuit is serially connected in instead
On the feedback control loop for presenting control circuit 17.Wherein, the second loop compensation circuit 16 is the faster loop compensation circuit of response speed.
With reference to Fig. 3, for the circuit diagram of single 100 1 preferred embodiment of feedback loop compensation switching module of the present invention.
As shown in figure 3, the first bleeder circuit 111 includes: resistance R1 and resistance R2；Filter circuit 112 includes: capacitor C1.
Voltage reference circuit 12 includes: current-limiting resistance R3 and reference voltage generator 122U2.Comparison circuit 13 includes: voltage comparator
U1-A；Controlled switch 14 includes: photoelectrical coupler U3；First RC circuit includes: resistance R7 and capacitor C3；2nd RC circuit packet
It includes: the capacitor C4 of resistance R8；Feedback control circuit 17 includes comparator U4-A.
The first end of resistance R1 as the first bleeder circuit 111 first end access input signal (INPUT), resistance R1 with
Noninverting input of the connecting node of resistance R2 as the second end connection voltage comparator U1-A of the first bleeder circuit 111, electricity
The second end ground connection of R2 is hindered, capacitor C1 is connected in parallel on the both ends of resistance R2.
The first end of current-limiting resistance R3 connects power supply signal (VCC) as the first end of current-limiting circuit 121, current-limiting resistance R3
Second end pass through the reverse input end of resistance R5 connection voltage comparator U1-A, the first end of reference voltage generator 122U2
Connect the second end of current-limiting resistance R3, the third end ground connection of reference voltage generator 122U2, voltage comparator together with second end
The reverse input end of U1-A also passes through resistance R4 and is grounded.
Anode of the output end of voltage comparator U1-A by the conducting portion U3-A of resistance R6 connection photoelectrical coupler U3, light
The minus earth of the conducting portion U3-A of electric coupler U3；The first end of the conducting control unit U3-B of photoelectrical coupler U3 passes sequentially through
Capacitor C3 connects the reverse input end of comparator U4-A, the second end of the conducting control unit U3-B of photoelectrical coupler U3 with resistance R7
Connect the output end of comparator U4-A；Resistance R8 and capacitor C4 series connection after, then be connected in parallel on comparator U4-A reverse input end and
Output end.
It is illustrated below according to concrete principle of the Fig. 3 to feedback loop compensation switching module 100 of the invention.
As shown in figure 3, the feedback signal of dim signal or frequency conversion control circuit 200 is carried out by resistance R1, resistance R2
After partial pressure, the noninverting input for being input to voltage comparator U1-A is filtered by capacitor C1, voltage reference generator U2 is mentioned
For reference voltage, and the reverse input end by being input to voltage comparator U1-A after resistance R4 and resistance R5 partial pressure.
When the noninverting input voltage of voltage comparator U1-A is less than its reverse input end voltage, voltage comparator U1-A
A low level signal is exported, illustrates the feedback signal of dim signal or frequency conversion control circuit 200 already below preset threshold
Value, it is meant that frequency conversion control circuit 200 enters maximum operation frequency state, needs faster loop response speed；Due to electricity
Comparator U1-A is pressed to export a low level signal, U3-A is not turned on, at this point, U3-B is also not turned on, by U3-B, resistance R7 and electricity
The first loop compensation circuit 15 for holding the slow-response speed of C3 composition disconnects, and the quick response being made of resistance R8 and capacitor C4
Second loop compensation circuit 16 of speed works, and then (is become by the main control circuit that comparator U4-A feeds back to driving power
Frequency control circuit 200), so that frequency conversion control circuit 200 is adapted to maximum operating frequency, to improve the stability of circuit, solves
The certainly LED flicker problem that human eye can be seen that.
In addition, the present invention also provides a kind of driving power, including feedback loop compensation switching circuit above-mentioned.The driving
Power supply includes but is not limited to LED drive power.The driving power can be made by the way that above-mentioned feedback loop compensation switching circuit is arranged
Frequency conversion control circuit 200 inside driving power has different loop compensation response speeds under different working frequencies, solution
There is the flicker problem of human viewable in LED lamp of having determined, while improving frequency conversion control circuit 200 in different loads
The stability of work, and then promote the stability and reliability of driving power.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of feedback loop compensation switching circuit, applied to the LED drive power using variable frequency shaping modes, feature
It is, comprising: access multiple feedback loop compensation switching modules of input signal and switch with the multiple feedback loop compensation
The frequency conversion control circuit of module connection；The multiple feedback loop compensation switching module is to be connected in parallel, for being classified adjustment pair
Answer the loop compensation parameter of different operating frequency；
Each described feedback loop compensation switching module includes: the access input signal and the signal inspection for exporting detection signal
Slowdown monitoring circuit, the voltage reference circuit for generating reference voltage connect with the signal deteching circuit and the voltage reference circuit
The comparison circuit connect, the controlled switch being connect with the comparison circuit and the first loop compensation being connect with the controlled switch
Circuit and the second loop compensation circuit and feedback control circuit；Wherein, first loop compensation circuit be response speed compared with
Slow loop compensation circuit, second loop compensation circuit are the faster loop compensation circuit of response speed；
The comparison circuit is used to for the voltage of the detection signal being compared with the reference voltage, and according to comparison result
The controlled switch on or off is controlled, to gate first loop compensation circuit or second loop compensation electricity
Road, and then export the feedback control circuit according to first loop compensation circuit or second loop compensation circuit
Thermal compensation signal is to the frequency conversion control circuit；
It include: to gate second loop compensation circuit when the voltage for detecting signal is less than reference voltage；When detection signal
When voltage is greater than reference voltage, first loop compensation circuit is gated.
2. feedback loop compensation switching circuit according to claim 1, which is characterized in that the signal deteching circuit packet
It includes: the first bleeder circuit and the filter circuit being connect with first bleeder circuit；
Wherein, the first end of first bleeder circuit accesses the input signal, and the second end of first bleeder circuit connects
Connect the first input end of the comparison circuit.
3. feedback loop compensation switching circuit according to claim 1, which is characterized in that the voltage reference circuit packet
It includes: the second bleeder circuit；
The first end of second bleeder circuit connects power supply signal, and the second end of second bleeder circuit connects the comparison
Second input terminal of circuit.
4. feedback loop compensation switching circuit according to claim 1, which is characterized in that the voltage reference circuit packet
It includes: reference voltage generator and current-limiting circuit；
The first end of the current-limiting circuit connects power supply signal, and the second end of the current-limiting circuit connects the reference voltage and generates
The first end and second end of device, the second end of the reference voltage generator are also connected with the second input terminal of the comparison circuit,
Reference voltage generator third end ground connection.
5. feedback loop compensation switching circuit according to claim 1, which is characterized in that the comparison circuit includes: electricity
Press comparator；
The noninverting input of the voltage comparator connects the signal deteching circuit, the reverse input end of the voltage comparator
The voltage reference circuit is connected, the output end of the voltage comparator connects the controlled switch.
6. feedback loop compensation switching circuit according to claim 1, which is characterized in that the controlled switch includes photoelectricity
Coupler or relay.
7. feedback loop compensation switching circuit according to claim 1, which is characterized in that first loop compensation circuit
It include: the conducting control unit and the first RC circuit of controlled switch；
After the conducting control unit of the controlled switch is connected with the first RC circuit, then access the anti-of the feedback control circuit
Present loop.
8. feedback loop compensation switching circuit according to claim 1, which is characterized in that second loop compensation circuit
It include: the 2nd RC circuit；
The 2nd RC circuit is serially connected on the feedback control loop of the feedback control circuit.
9. a kind of driving power, which is characterized in that including the described in any item feedback loop compensation switching electricity of claim 1-8
Road.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811167725.4A CN109496009B (en) | 2018-10-08 | 2018-10-08 | A kind of feedback loop compensation switching circuit and driving power |
| PCT/CN2019/080581 WO2020073622A1 (en) | 2018-10-08 | 2019-03-29 | Feedback loop compensation switching circuit and driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811167725.4A CN109496009B (en) | 2018-10-08 | 2018-10-08 | A kind of feedback loop compensation switching circuit and driving power |
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| CN109496009A CN109496009A (en) | 2019-03-19 |
| CN109496009B true CN109496009B (en) | 2019-10-08 |
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| CN109496009B (en) * | 2018-10-08 | 2019-10-08 | 深圳市崧盛电子股份有限公司 | A kind of feedback loop compensation switching circuit and driving power |
| CN112312490B (en) * | 2019-08-01 | 2022-09-16 | 中国移动通信集团浙江有限公司 | Signal switching device and system |
| CN114679815B (en) * | 2022-04-19 | 2023-05-26 | 珠海市圣昌电子有限公司 | Control circuit capable of changing response speed of feedback loop of LED dimming power supply in real time |
| CN114596821B (en) * | 2022-05-09 | 2022-08-16 | 惠科股份有限公司 | Control circuit, control method and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100485633C (en) * | 2006-03-23 | 2009-05-06 | 鸿富锦精密工业（深圳）有限公司 | CPU frequency regulation circuit |
| US7872546B1 (en) * | 2009-07-07 | 2011-01-18 | Alpha And Omega Semiconductor Incorporated | Multi mode modulator and method with improved dynamic load regulation |
| CN102364861A (en) * | 2011-10-27 | 2012-02-29 | 上海大学 | Control device and method for interleaved parallel LLC (Logical Link Control) resonant converter |
| CN104168685A (en) * | 2013-05-16 | 2014-11-26 | 上海昂帕微电子技术有限公司 | Loop compensation control-based dimmable LED driver |
| CN103596343A (en) * | 2013-11-29 | 2014-02-19 | 昆山泰顺自动化设备有限公司 | LED driven feedback control circuit |
| CN103702477A (en) * | 2013-12-04 | 2014-04-02 | 生迪光电科技股份有限公司 | Multi-color LED (Light-emitting Diode) illumination system and LED driving circuit based on PFM (Pulse Frequency Modulation) dimming |
| CN203674971U (en) * | 2013-12-12 | 2014-06-25 | 深圳市金威源科技股份有限公司 | Switch power feedback circuit |
| CN205584542U (en) * | 2016-03-03 | 2016-09-14 | 仝彤 | High pressure, high frequency, pump formula drive power supply's ACLED light source |
| CN105896943B (en) * | 2016-05-27 | 2018-08-28 | 南京矽力杰半导体技术有限公司 | A kind of control circuit, control method and apply its Switching Power Supply |
| CN206060521U (en) * | 2016-08-18 | 2017-03-29 | 深圳欧陆通电子有限公司 | And electromechanical source and its constant current start control circuit |
| CN106535391B (en) * | 2016-10-11 | 2018-12-25 | 昆山龙腾光电有限公司 | Peak current absorbing circuit and its control method and light emitting diode drive device |
| CN109496009B (en) * | 2018-10-08 | 2019-10-08 | 深圳市崧盛电子股份有限公司 | A kind of feedback loop compensation switching circuit and driving power |
-
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- 2018-10-08 CN CN201811167725.4A patent/CN109496009B/en active Active
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| WO2020073622A1 (en) | 2020-04-16 |
| CN109496009A (en) | 2019-03-19 |
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