CN208273304U - A kind of LED control device - Google Patents
A kind of LED control device Download PDFInfo
- Publication number
- CN208273304U CN208273304U CN201820884346.6U CN201820884346U CN208273304U CN 208273304 U CN208273304 U CN 208273304U CN 201820884346 U CN201820884346 U CN 201820884346U CN 208273304 U CN208273304 U CN 208273304U
- Authority
- CN
- China
- Prior art keywords
- switch pipe
- led
- output end
- unit
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The utility model discloses a kind of LED control devices, including charge switch pipe, continued flow tube, LED luminescence unit, further include: dimming control switch pipe, the output end of the dimming control switch pipe is connected between energy storage inductor and LED luminescence unit, is output to the electric current of LED luminescence unit with energy storage inductor of releasing for receiving dimming control signal.The utility model exports control by setting dimming control switch pipe, to the electric current of energy storage inductor, and overcoming LED lamp bead brightness existing in the prior art cannot achieve the problem of reliable adjustment cannot reach perfect condition with effectively light modulation, LED luminance adjustment.Minimum light modulation may be implemented in this LED control device, and circuit is simple, has good social and economic benefit.In addition, the utility model also passes through setting feedback unit, effective control of LED luminescence unit light modulation electric current is intelligently realized, and then avoids energy loss extra in dimming process.The utility model circuit can be widely applied to electronic circuit field.
Description
Technical field
The utility model relates to microelectronics technology, especially a kind of LED control device.
Background technique
In the prior art, the topological structure of Light-emitting diode LED driving method, as illustrated in figs. 1A and ib, usually with two
Kind circuit framework, is common cathode (Fig. 1 a) and common-anode (Fig. 1 b) connection type respectively.Its concrete operating principle is: periodically
Pwm signal controls NMOS driving tube NMOS1 switch, gives inductance L charge and discharge together with sustained diode 0, when NMOS1 conducting,
It charges to inductance L, the electric current on inductance L increases；When NMOS1 cut-off, sustained diode 0 is connected, inductance L electric discharge, inductance L
On electric current decline.The lesser electric current of ripple is generated by the pwm signal of high frequency to drive the LED luminescence unit of periphery.
In actual use, the LED lamp bead brightness under above-mentioned driving method can not adjust the glimmer of special occasions requirement
Or ultralow brightness, LED luminance adjustment cannot reach perfect condition.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of the utility model is to provide a kind of LED control device, the circuit is fine
Ground solves the problems, such as that LED lamp bead is difficult to realize controllable minimum light modulation in the prior art.
The technical scheme adopted by the utility model is
A kind of LED control device, including charge switch pipe, continued flow tube, LED luminescence unit and dimming control switch pipe；It fills
Electric switch pipe charges for receiving charging control signal and then controlling energy storage inductor；Continued flow tube is connected with charge switch pipe,
It discharges for controlling energy storage inductor；The output end of dimming control switch pipe be connected to energy storage inductor and LED luminescence unit it
Between, the electric current of LED luminescence unit is output to energy storage inductor of releasing for receiving dimming control signal.
Preferably, charge switch pipe is metal-oxide-semiconductor, and continued flow tube is metal-oxide-semiconductor or freewheeling diode, and dimming control switch pipe is
Metal-oxide-semiconductor or triode.Preferably, charge switch pipe can be NMOS tube, and continued flow tube can be NMOS tube, dimming control switch pipe
It can be NMOS tube.
Preferably, when LED control device is common cathode driving circuit, if charge switch pipe uses NMOS tube, continued flow tube is adopted
With NMOS tube, dimming control switch pipe uses NMOS tube, then the circuit connecting relation of the common cathode driving circuit is such as are as follows: charging
The drain electrode of the source electrode and continued flow tube of switching tube connects；The source electrode of continued flow tube is grounded, the source electrode of charge switch pipe also with energy storage inductor
Input terminal connection；The output end of energy storage inductor is connect with the anode of LED luminescence unit；The drain electrode of dimming control switch pipe with
The connection of LED luminescence unit anode；The source level of dimming control switch pipe is grounded, and LED luminescence unit cathode is through sensing resistance eutral grounding.It fills
Electric switch pipe and continued flow tube and dimming control switch pipe form bridge circuit unit.
Preferably, common cathode driving circuit further includes micro-control unit, PWM logic control element, output prime driving list
Member, feedback unit and clock oscillation unit；The signal output end of micro-control unit and the signal input part of PWM logic control element
Connection；The signal output end of feedback unit is connect with the signal input part of PWM logic control element；PWM logic control element
Signal output end is connect with the signal input part of output fore-stage driver unit；Export the signal output end and bridge of fore-stage driver unit
The signal input part of formula circuit unit connects；The signal output end of LED luminescence unit and the signal input part of feedback unit connect；
The signal output end of clock oscillation unit is connect with the signal input part of PWM logic control element.
The signal output end of micro-control unit includes enable signal output end and PWM dim signal output end；PWM logic control
The signal output end of unit processed include charge switch pipe logic control signal output end, continued flow tube logic control signal output end and
Dim logic control signal output end；The signal output end of output fore-stage driver unit includes the output of charge switch pipe driving signal
End, continued flow tube driving signal output end and light modulation driving signal output end.Enable signal output end is for controlling driving circuit
Standby current, PWM dim signal output end is for controlling light modulation electric current.
Preferably, feedback unit include comparator and sensing resistance, comparator be used for sensing resistance output voltage with
Reference voltage is compared, and comparison result is output to PWM logic control element.
Preferably, comparator includes first comparator and the second comparator, and first comparator is in-phase voltage comparator, the
The in-phase end of one comparator is connected between LED luminescence unit cathode and sensing resistance, and for receiving detection voltage, first compares
The reverse side of device is connected to the network reference voltage input by the first proportion resistor；The output end and PWM logic of first comparator
The signal input part of control unit connects.Reference voltage is V_ref, and reverse side input voltage is V_ref/n, and detection voltage is less than
When reverse side input voltage, first comparator exports low level；It detects voltage and is greater than reverse side input voltage, first comparator is defeated
High level out.
Second comparator is reverse voltage comparator, and the in-phase end of the second comparator passes through concatenated first proportion resistor net
Network and the second proportion resistor are connected to the network reference voltage input；It is negative that the reverse side of second comparator is connected to LED luminescence unit
Between pole and sensing resistance, for receiving detection voltage；The output end of second comparator and the signal of PWM logic control element are defeated
Enter end connection.Reference voltage is V_ref, and in-phase end input voltage is V_ref/n multiplied by proportionality coefficient d, i.e. d*V_ref/n,
When detecting voltage less than in-phase end input voltage, the second comparator exports high level；It detects voltage and is greater than in-phase end input voltage
When, the second comparator exports low level.
Preferably, the proportionality coefficient d range of the second proportion resistor network is 80 50 percent to percent.
Preferably, the above PWM current control circuit can be integrated in LED control chip.
Preferably, when LED control device is common-anode driving circuit, the circuit connecting relation of common-anode driving circuit are as follows:
The drain electrode of continued flow tube connects input power；The source electrode of continued flow tube is connect with the drain electrode of electric switch pipe；The source electrode of charge switch pipe connects
Ground；The source electrode of continued flow tube is also connect with the input terminal of energy storage inductor；The output end of energy storage inductor and the cathode of LED luminescence unit connect
It connects；The drain electrode of dimming control switch pipe connects input power；The source electrode and LED luminescence unit cathode of dimming control switch pipe connect
It connects；LED luminescence unit anode connects input power by sensing resistance.
The beneficial effects of the utility model are:
The utility model provides a kind of LED control device, by the way that dimming control switch pipe is arranged, to the electric current of energy storage inductor
Output control, the glimmer or super of special occasions requirement can not be adjusted by overcoming LED lamp bead brightness existing in the prior art
The problem of low-light level, LED luminance adjustment cannot reach perfect condition, so that the tune of ultralow brightness may be implemented in LED control device
Light, and circuit is simple, has good social and economic benefit.
In addition, the utility model also passes through setting feedback unit, having for LED luminescence unit light modulation electric current is intelligently realized
Effect control, and then avoid energy loss extra in dimming process.
The utility model can be widely applied to electronic circuit field.
Detailed description of the invention
Specific embodiment of the present utility model is described further with reference to the accompanying drawing:
Fig. 1 a is LED driving method common cathode architecture diagram in the prior art；
Fig. 1 b is LED driving method common-anode architecture diagram in the prior art；
Fig. 2 a is a kind of common cathode LED control device functional-block diagram of the utility model；
Fig. 2 b is a kind of common cathode LED control device concrete structure diagram of the utility model；
Fig. 3 is a kind of common-anode LED control device concrete structure diagram of the utility model.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As the first embodiment of the utility model, as shown in Figure 2 a, a kind of common cathode LED control device, including micro-control
Unit 1, PWM logic control element 2, output fore-stage driver unit 3, feedback unit 4, clock oscillation unit 5 and bridge circuit processed
Unit 6.It further include energy storage inductor L and LED luminescence unit.Specifically, as shown in Figure 2 b, bridge circuit unit 6 includes that charging is opened
Close pipe 61 and continued flow tube 62 and dimming control switch pipe 63.Charge switch pipe 61 is for receiving charging control signal HS in turn
Control energy storage inductor L charges；Continued flow tube 62 is connected with charge switch pipe 61, for receiving charging control signal LS control storage
Energy inductance L discharges；The output end of dimming control switch pipe 63 is connected between energy storage inductor L and LED luminescence unit, is used for
Receive the electric current IL that dim signal DIM is output to LED luminescence unit with the energy storage inductor L that releases.
Specifically, as shown in Figure 2 b, feedback unit 4 include first comparator 41, the second comparator 42, sensing resistance 43,
First proportion resistor network 44 and the second proportion resistor network 45, first comparator 41 and the second comparator 42 will be for that will sense electricity
The output voltage of resistance 43 detects voltage CS and is compared with reference voltage V_ref, and comparison result is output to PWM logic control
Unit 2 processed.
The in-phase end of first comparator 41 is connected between LED luminescence unit cathode and sensing resistance 43, for receiving inspection
Voltage CS is surveyed, reverse side passes through first proportion resistor network 44 (it realizes that proportionality coefficient is 1/n) connection benchmark voltage input
End, the output end of first comparator 41 are connect with the signal input part of PWM logic control element 2.Reference voltage is V_ref, instead
Phase end input voltage is V_ref/n, and when detection voltage CS is less than reverse side input voltage V_ref/n, first comparator 41 is exported
Low level；It detects voltage CS and is greater than reverse side input voltage V_ref/n, first comparator 41 exports high level.
The in-phase end of second comparator 42 by concatenated second proportion resistor network 45 (it realizes that proportionality coefficient is d) and
First proportion resistor network 44 (it realizes that proportionality coefficient is 1/n) connection reference voltage input；The reverse phase of second comparator 42
End is connected between LED luminescence unit cathode and sensing resistance 43, for receiving detection voltage CS；The output of second comparator 42
End is connect with the signal input part of PWM logic control element 2.Reference voltage is V_ref, and in-phase end input voltage is V_ref/n
Multiplied by proportionality coefficient d, i.e. d*V_ref/n, when detecting voltage CS less than in-phase end input voltage d*V_ref/n, second compares
Device 42 exports high level；When detecting voltage CS greater than in-phase end input voltage d*V_ref/n, the second comparator 42 exports low electricity
It is flat.The proportionality coefficient d range of second proportion resistor network 45 is 80 50 percent to percent.Ginseng can be set in the present embodiment
Examining value is 70 percent.
In first embodiment, a kind of connection relationship of common cathode LED control device is as follows: the signal of micro-control unit 1 is defeated
Outlet is connect with the signal input part of PWM logic control element 2；The signal output end and PWM logic control element of feedback unit 4
2 signal input part connection；The signal output end of PWM logic control element 2 and the signal input part of output fore-stage driver unit 3
Connection；The signal output end of output fore-stage driver unit 3 is connect with the signal input part of bridge circuit unit 6；LED luminescence unit
Signal output end connect with the signal input part of feedback unit 4；The signal output end of clock oscillation unit 5 and the control of PWM logic
The signal input part of unit 2 processed connects.Specifically, in bridge circuit unit 6, the source electrode and continued flow tube 62 of charge switch pipe 61
Drain electrode connection；The source electrode of continued flow tube 62 is grounded, and the source electrode of charge switch pipe 61 is also connect with the input terminal of energy storage inductor L；Storage
The output end of energy inductance L is connect with the anode of LED luminescence unit；The drain electrode of dimming control switch pipe 63 and LED luminescence unit are just
Pole connection；LED luminescence unit cathode is grounded through sensing resistance 43.
In first embodiment, as shown in Figure 2 a, a kind of signal end of common cathode LED control device includes: micro-control unit 1
Signal output end include enable signal end EN and PWM dim signal end DIM；The signal output end packet of PWM logic control element 2
Include charge switch pipe logic control signal output end HS, continued flow tube logic control signal output end LS and light modulation logic control signal
Output end LS_DIM；The signal output end for exporting fore-stage driver unit 3 includes charge switch pipe driving signal output end DRV_
HS, continued flow tube driving signal output end DRV_LS and light modulation driving signal output end DRV_DIM.Enable signal end EN is for controlling
The standby current of driving circuit processed, PWM dim signal end DIM is for controlling light modulation electric current.
In first embodiment, it is multicycle PWM electric current respectively that there are two types of operating modes for a kind of common cathode LED control device
Mode and monocycle PWM current-mode.
Specifically, under multicycle PWM current-mode: reference signal V_ref/n and LED output electric current I_LED is through outer
It meets detection voltage CS caused by sensing resistance 43 to send to the input terminal of first comparator 41, generates first through first comparator 41
Comparison result signal VO1.The clock signal clock that first comparison result signal VO1 and clock oscillator unit 5 generate is through PWM
The processing of logic control element 2 generates charge switch pipe logic control signal HS and continued flow tube logic control signal LS, charge switch
Pipe logic control signal HS and continued flow tube logic control signal LS generates bridge circuit unit using output fore-stage driver unit 3
62 driving signal DRV_LS of 6 charge switch pipe, 61 driving signal DRV_HS and continued flow tube, by controlling 61 He of charge switch pipe
The peak value and ripple for being switched on and off to control LED output electric current I_LED of continued flow tube 62.
Specifically, under monocycle PWM current-mode: reference signal V_ref/n multiplied by proportionality coefficient d after with detection electricity
Pressure CS is sent to the input terminal of the second comparator 42, is compared through the second comparator 42 and is generated the second comparison result signal VO2.Second ratio
It is handled compared with consequential signal VO2 through PWM logic control element 2 and generates light modulation logic control signal LS_DIM, light modulation logic control letter
Number LS_DIM generates dimming control switch pipe driving signal DRV_DIM using output fore-stage driver unit 3, passes through control and adjusts
The low current brightness adjustment control of photocontrol switching tube 63 being switched on and off to realization to LED luminescence unit.
As shown in figure 3, another feasible program as embodiment, multi-mode LED driving implementation is variable to be turned to altogether
Anode framework, i.e., a kind of common-anode LED control device.In a kind of common-anode LED control device of second embodiment, light modulation is controlled
The top of bridge circuit unit 6 is arranged in switching tube 63 processed, energy storage inductor L when the continued flow tube 62 in bridge circuit unit 6 is connected
Electric discharge, and energy storage inductor L charges when the conducting of charge switch pipe 61.That sensing resistance 43 detects is input power VIN and detection electricity
Press the voltage difference between CS, inside need to be converted to reference voltage V_ref the reference data of opposite input power VIN again with inspection
Voltage CS is surveyed to compare.Cathode framework is identical together for its multicycle PWM current-mode and monocycle PWM Controlled in Current Mode and Based mode.
Specifically, as another feasible program of embodiment, a kind of common-anode LED control device of second embodiment includes
Micro-control unit 1, PWM logic control element 2, output fore-stage driver unit 3, feedback unit 4, clock oscillation unit 5, charging are opened
It closes pipe 61 and continued flow tube 62, dimming control switch pipe 63, first comparator 41, the second comparator 42, sensing resistance 43, first compares
Example resistor network 44, the second proportion resistor network 45, energy storage inductor L and LED luminescence unit.
Specifically, as another feasible program of embodiment, a kind of company of common-anode LED control device of second embodiment
Connect relationship are as follows: the drain electrode of continued flow tube 62 connects input power VIN；The drain electrode of the source electrode and charge switch pipe 61 of continued flow tube 62 connects
It connects；The source electrode of charge switch pipe 61 is grounded；The source electrode of continued flow tube 62 is also connect with the input terminal of energy storage inductor L；Energy storage inductor L's
Output end is connect with the cathode of LED luminescence unit；The drain electrode of dimming control switch pipe 63 connects input power VIN；Brightness adjustment control
The source electrode of switching tube 63 is connect with LED luminescence unit cathode；LED luminescence unit anode connects input power through sensing resistance 43
VIN.Cathode framework is identical together for its external circuit unit connection type.
It is to be illustrated to the preferable implementation of the utility model, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent variations without departing from the spirit of the present invention
Or replacement, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of LED control device, comprising: charge switch pipe, the charge switch pipe is for receiving charging control signal in turn
Control energy storage inductor charges；Continued flow tube, the continued flow tube are connected with charge switch pipe, are put for controlling energy storage inductor
Electricity；LED luminescence unit；It is characterized by further comprising: dimming control switch pipe, the output end of the dimming control switch pipe connects
It is connected between energy storage inductor and LED luminescence unit, LED is output to energy storage inductor of releasing for receiving dimming control signal and is shone
The electric current of unit.
2. a kind of LED control device according to claim 1, which is characterized in that the charge switch pipe is metal-oxide-semiconductor；Institute
Stating continued flow tube is metal-oxide-semiconductor or freewheeling diode；The dimming control switch pipe is metal-oxide-semiconductor；The charge switch pipe and continued flow tube
And dimming control switch pipe forms bridge circuit unit.
3. a kind of LED control device according to claim 2, which is characterized in that the charge switch pipe is NMOS tube；Institute
Stating continued flow tube is NMOS tube；The dimming control switch pipe is NMOS tube.
4. a kind of LED control device according to claim 3, which is characterized in that the LED control device is common cathode drive
When dynamic circuit, the circuit connecting relation of the common cathode driving circuit is as follows:
The drain electrode of the source electrode and continued flow tube of the charge switch pipe connects；
The source electrode of the continued flow tube is grounded；
The source electrode of the charge switch pipe is also connect with the input terminal of energy storage inductor；
The output end of the energy storage inductor is connect with the anode of LED luminescence unit；
The drain electrode of the dimming control switch pipe is connect with LED luminescence unit anode；
The LED luminescence unit cathode ground connection.
5. a kind of LED control device according to claim 4, which is characterized in that the common cathode driving circuit further includes
Micro-control unit, PWM logic control element, output fore-stage driver unit, feedback unit and clock oscillation unit；
The signal output end of the micro-control unit is connect with the signal input part of PWM logic control element；
The signal output end of the feedback unit is connect with the signal input part of PWM logic control element；
The signal output end of the PWM logic control element is connect with the signal input part of output fore-stage driver unit；
The signal output end of the output fore-stage driver unit is connect with the signal input part of bridge circuit unit；
The signal output end of the LED luminescence unit and the signal input part of feedback unit connect；
The signal output end of the clock oscillation unit is connect with the signal input part of PWM logic control element.
6. a kind of LED control device according to claim 5, which is characterized in that the signal of the micro-control unit exports
End includes enable signal output end and PWM dim signal output end；
The signal output end of PWM logic control element includes charge switch pipe logic control signal output end, continued flow tube logic control
Signal output end processed and light modulation logic control signal output end；
The signal output end of output fore-stage driver unit includes that charge switch pipe driving signal output end, continued flow tube driving signal are defeated
Outlet and light modulation driving signal output end.
7. a kind of LED control device according to claim 5, which is characterized in that the feedback unit include comparator and
Sense resistance；The LED luminescence unit cathode is sensed resistance eutral grounding, and the comparator is used to export the both ends of sensing resistance
Voltage is compared with reference voltage, and comparison result is output to PWM logic control element.
8. a kind of LED control device according to claim 7, which is characterized in that the comparator includes first comparator
With the second comparator；
The first comparator is in-phase voltage comparator, and it is negative that the in-phase end of the first comparator is connected to LED luminescence unit
Between pole and sensing resistance, for receiving detection voltage；
The reverse side of the first comparator is connected to the network reference voltage input by the first proportion resistor；
The output end of the first comparator is connect with the signal input part of PWM logic control element；
Second comparator is reverse voltage comparator, and the in-phase end of second comparator passes through concatenated first ratio electricity
It hinders network and the second proportion resistor is connected to the network reference voltage input；
The reverse side of second comparator is connected between LED luminescence unit cathode and sensing resistance, for receiving detection electricity
Pressure；
The output end of second comparator is connect with the signal input part of PWM logic control element.
9. a kind of LED control device according to claim 8, which is characterized in that the ratio of the second proportion resistor network
Example coefficient range is 80 50 percent to percent.
10. a kind of LED control device according to claim 3, which is characterized in that the LED control device is common-anode
When driving circuit, the circuit connecting relation of the common-anode driving circuit is as follows:
The drain electrode of the continued flow tube connects input power；
The source electrode of the continued flow tube is connect with the drain electrode of charge switch pipe；
The source electrode of the charge switch pipe is grounded；
The source electrode of the continued flow tube is also connect with the input terminal of energy storage inductor；
The output end of the energy storage inductor is connect with the cathode of LED luminescence unit；
The drain electrode of the dimming control switch pipe connects input power；
The source electrode of the dimming control switch pipe is connect with LED luminescence unit cathode；
The LED luminescence unit anode connects input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820884346.6U CN208273304U (en) | 2018-06-06 | 2018-06-06 | A kind of LED control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820884346.6U CN208273304U (en) | 2018-06-06 | 2018-06-06 | A kind of LED control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208273304U true CN208273304U (en) | 2018-12-21 |
Family
ID=64689839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820884346.6U Active CN208273304U (en) | 2018-06-06 | 2018-06-06 | A kind of LED control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208273304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108650738A (en) * | 2018-06-06 | 2018-10-12 | 深圳市巴丁微电子有限公司 | A kind of LED control circuit |
-
2018
- 2018-06-06 CN CN201820884346.6U patent/CN208273304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108650738A (en) * | 2018-06-06 | 2018-10-12 | 深圳市巴丁微电子有限公司 | A kind of LED control circuit |
| CN108650738B (en) * | 2018-06-06 | 2024-04-23 | 深圳率能半导体有限公司 | LED control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | A novel primary-side regulation scheme for single-stage high-power-factor AC–DC LED driving circuit | |
| TWI523569B (en) | Adjustable LED driver circuit and drive method | |
| CN102695341B (en) | LED drive power supply applicable to electronic transformer | |
| CN100576965C (en) | Led drive circuit and control method | |
| CN103503563B (en) | Dimmable LED driver and control method thereof | |
| Cheng et al. | Design and implementation of a high-power-factor LED driver with zero-voltage switching-on characteristics | |
| EP2496056B1 (en) | Constant-current-drive led module device | |
| CN107094329A (en) | Led drive circuit | |
| CN103702486A (en) | LED driving circuit system, control circuit and control method | |
| US9338843B2 (en) | High power factor, electrolytic capacitor-less driver circuit for light-emitting diode lamps | |
| US20100295478A1 (en) | Led driving circuit | |
| CN103648202A (en) | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit | |
| CN105792421B (en) | A kind of no bridge type LED drive power | |
| US9119274B2 (en) | Resonant converter control | |
| CN110446308A (en) | For controlling control circuit, driving circuit, LED lamp system and the control method of power transistor | |
| CN105517268A (en) | Bus current control circuit, current-constant driving controller and LED light source | |
| CN103220871A (en) | HID (High Intensity Discharge) xenon lamp electronic ballast with soft switching mode and low-frequency square wave driving | |
| CN108650738A (en) | A kind of LED control circuit | |
| CN101909376B (en) | High-power LED drive circuit | |
| CN208273304U (en) | A kind of LED control device | |
| CN105101539A (en) | Light-emitting diode (LED) constant current driving circuit | |
| CN205546103U (en) | Flyback drive circuit | |
| CN104869686A (en) | Driving circuit and illuminating device comprising same | |
| CN203279292U (en) | Double-loop current-limiting drive circuit | |
| CN105792437B (en) | A kind of LED drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |