CN104684175A - Optical coupler feedback LED (light emitting diode) constant current driving circuit and LED illuminating equipment - Google Patents
Optical coupler feedback LED (light emitting diode) constant current driving circuit and LED illuminating equipment Download PDFInfo
- Publication number
- CN104684175A CN104684175A CN201310635916.XA CN201310635916A CN104684175A CN 104684175 A CN104684175 A CN 104684175A CN 201310635916 A CN201310635916 A CN 201310635916A CN 104684175 A CN104684175 A CN 104684175A
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- chip
- electric capacity
- voltage
- 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.)
- Granted
Links
Landscapes
- Led Devices (AREA)
Abstract
The embodiments of the invention disclose an optical coupler feedback LED (light emitting diode) constant current driving circuit and LED illuminating equipment. The circuit comprises a chip U1, an input protection circuit, a feedback circuit, a tank circuit, a current control circuit and an overvoltage protection circuit; the cathode of the input protection circuit is connected with the chip U1 for adjusting input voltage; the feedback circuit is connected with the chip U1 for providing feedback to the chip U1 and outputting stable voltage; the tank circuit is connected with the chip U1 and the anode of the input protection circuit at the same time for storing electric energy; the current control circuit is connected with the tank circuit for adjusting load current; the overvoltage protection circuit is connected with the anode of the input protection circuit and the current control circuit at the same time for maintaining to output stable voltage when the feedback circuit is failed; the circuit keeps the voltage flowing through the load stable through controlling the current flowing through the load, and a transformer is not required; the circuit disclosed by the embodiments of the invention is simple in structure, low in failure rate and low in cost.
Description
Technical field
The present invention relates to field of illumination systems, particularly relate to a kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device.
Background technology
Due to the semiconductor device that LED is characteristic sensitivity, again there is negative temperature characteristic, thus in use need to protect it.LED component is to the requirement of driving power near harshness, and LED is different from common incandescent lamp bulb, and ordinary incandescent lamp bubble directly can connect the electric main of 220V, and LED only needs the low voltage drive of 2 ~ 3 volts, must use LED drive circuit.
The LED of different purposes, be equipped with different drive circuits and power supply adaptor, and LED drive circuit structure of the prior art is complicated, and failure rate is high, and efficiency is lower, for user causes very big inconvenience.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device, and this circuit keeps flow through the stable of load voltage, without the need to transformer by the electric current of control flow check overload.
The opto-coupled feedback constant current driver circuit for LED that the embodiment of the present invention provides, comprising: chip U1, input protection circuit, feedback circuit, accumulator, current control circuit, overvoltage crowbar, wherein,
The negative pole of described input protection circuit is connected with described chip U1, for regulating input voltage, described feedback circuit is connected with described chip U1, for providing feedback for described chip U1, the voltage of stable output, described accumulator is connected with the positive pole of described chip U1 and described input protection circuit simultaneously, for store electrical energy, described current control circuit is connected with described accumulator, for regulating load electric current, be connected with the positive pole of described input protection circuit and described current control circuit while of described overvoltage crowbar, when losing efficacy for described feedback circuit, maintain the voltage of stable output.
As the optional execution mode of one; described input protection circuit comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
As the optional execution mode of one, described feedback circuit comprises: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.
As the optional execution mode of one, described first triode Q1 comprises: optocoupler triode.
As the optional execution mode of one, described current control circuit is connected with described accumulator, and described accumulator comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of described 5th diode D5 is connected with the D pin of described chip U1, one end of the first inductance L 1 respectively, the negative electrode of described 5th diode D5 and described input protection circuit positive pole be connected.
As the optional execution mode of one, described current control circuit comprises: the 6th diode D6 and the first resistance R1, wherein,
The anode of described 6th diode D6 is connected with one end of described first resistance R1, and the negative electrode of described 6th diode D6 is connected with the other end of described first resistance R1 and the other end of the first inductance L 1.
As the optional execution mode of one, described 6th diode D6 comprises light-emitting diode.
As the optional execution mode of one, described overvoltage crowbar comprises: the second resistance R2, voltage-stabiliser tube Z1 and the 7th diode D7, wherein,
One end of described second resistance R2 is connected with the negative electrode of described 7th diode D7, and the other end of described first resistance R1 is connected with described current control circuit and load simultaneously;
The anode of described 7th diode D7 is connected with the anode of described voltage-stabiliser tube Z1, and the negative electrode of described voltage-stabiliser tube Z1 is connected with the positive pole of described input protection circuit and load simultaneously.
As the optional execution mode of one, described load comprises one or more LED.
Correspondingly, the embodiment of the present invention also provides a kind of LED illumination device, and described LED illumination device comprises above-mentioned opto-coupled feedback constant current driver circuit for LED.
The opto-coupled feedback constant current driver circuit for LED that the embodiment of the present invention provides and LED illumination device, this circuit keeps flow through the stable of load voltage by the electric current of control flow check overload, and without the need to transformer, embodiment of the present invention circuit structure is simple, failure rate is low, with low cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is embodiment of the present invention opto-coupled feedback constant current driver circuit for LED structural representation;
Fig. 2 is another embodiment of the present invention opto-coupled feedback constant current driver circuit for LED structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1; it is embodiment of the present invention opto-coupled feedback constant current driver circuit for LED structural representation; namely embodiment of the present invention opto-coupled feedback constant current driver circuit for LED can be without the need to transformer the voltage that load provides stable; it comprises: chip U1, input protection circuit 10, feedback circuit 20, accumulator 30, current control circuit 40, overvoltage crowbar 50; wherein
The negative pole of described input protection circuit 10 is connected with described chip U1, for regulating input voltage, described feedback circuit 20 is connected with described chip U1, for providing feedback for described chip U1, the voltage of stable output, described accumulator 30 is connected with the positive pole of described chip U1 and described input protection circuit 10 simultaneously, for store electrical energy, described current control circuit 40 is connected with described accumulator 30, for regulating load electric current, be connected with the positive pole of described input protection circuit 10 and described current control circuit 40 while of described overvoltage crowbar 50, when losing efficacy for described feedback circuit 20, maintain the voltage of stable output.
Should be appreciated that the preferred LNK30X of chip U1, certainly, in other execution mode of the embodiment of the present invention, also can identical other electronic devices and components of selection function.
The opto-coupled feedback constant current driver circuit for LED that the embodiment of the present invention provides and LED illumination device, this circuit keeps flow through the stable of load voltage by the electric current of control flow check overload, and without the need to transformer, embodiment of the present invention circuit structure is simple, failure rate is low, with low cost.
Refer to Fig. 2, it is another embodiment of the present invention opto-coupled feedback constant current driver circuit for LED structural representation, namely opto-coupled feedback constant current driver circuit for LED of the present invention can be without the need to transformer the voltage that load provides stable, comprise: chip U1, input protection circuit 10, feedback circuit 20, accumulator 30, current control circuit 40, overvoltage crowbar 50, certainly, also comprise load 60, embodiment of the present invention load 60 comprises 6 LED, in other embodiments of the present invention, user can adjust quantity and the connected mode of LED according to actual needs, the present invention does not limit.
Input protection circuit 10 is connected with described chip U1; for regulating input voltage; it comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
Feedback circuit 20 is connected with described chip U1, for providing feedback for described chip U1, comprising: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.The size of the 4th electric capacity C4 can select 0.1 μ F, thus realizes high frequency decoupling and stored energy.
Should be appreciated that the first triode Q1 is optocoupler triode.
It is understood that when the electric current of the FB pin flowing into chip U1 is greater than 49 μ A (now voltage 1.65V), chip U1 inside can export a low logic level signal (inhibit signal).First triode Q1 can keep off state (forbidding).When the electric current flowing into FB pin is less than 49 μ A.Chip U1 internal feedback circuitry can export a high logic level signal (inhibit signal).First triode Q1 can keep opening state (enable).
Current control circuit 40 be connected with described accumulator 30 be connected, described accumulator 30 comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of the 5th diode D5 is connected with the D pin of chip U1, one end of the first inductance L 1 respectively, the negative electrode of the 5th diode D5 and input protection circuit positive pole be connected.
Current control circuit 40 comprises: the 6th diode D6 and the first resistance R1, wherein,
The anode of described 6th diode D6 is connected with one end of described first resistance R1, and the negative electrode of described 6th diode D6 is connected with the other end of described first resistance R1 and the other end of the first inductance L 1.
6th diode D6 comprises light-emitting diode, and its light sent is received by optocoupler triode first triode Q1.
Overvoltage crowbar 50 is connected with accumulator 30, the second resistance R2, voltage-stabiliser tube Z1 and the 7th diode D7, wherein,
One end of second resistance R2 is connected with the negative electrode of described 7th diode D7, and the other end of described first resistance R1 is connected with described current control circuit and load simultaneously;
The anode of described 7th diode D7 is connected with the anode of described voltage-stabiliser tube Z1, and the negative electrode of described voltage-stabiliser tube Z1 is connected with the positive pole of described input protection circuit and load simultaneously.
It is understood that, first triode Q1 is optocoupler triode, the light that output voltage Vo is sent by the 8th diode D8 is received by the first triode Q1, first triode Q1 produces photoelectric current according to the intensity of the light received, and the size of this photoelectric current obtains according to the current delivery rate (CTR) of selected optocoupler and the electric current I f of the 8th diode D8.8th diode D8 is light-emitting diode, and the specifications that its electric current I f looks into optocoupler or light-emitting diode by (Vo-Vz) can obtain, and therefore, regulates the value of voltage-stabiliser tube Z1, just can obtain required Vo value.
The operation principle of embodiment of the present invention circuit is: Vin input can input the alternating voltage of 85V to 265V, and Vo end exports low-voltage dc voltage.Alternating current inputs from the D pin of chip U1, S pin exports, the FB pin of chip U1 is used for input feedback signal, when the electric current flowing into FB pin is greater than 49 μ A (now voltage 1.65V), the switch of the first triode Q1 is terminated, and the BP pin of chip U1 is used for providing 5.8V operating voltage to chip U1.BP pin due to chip U1 is the energization pins of master control; there is under-voltage protection function: the switch of closing power MOSFET when this pin voltage drops to 4.85 below V; once under bypass pin voltage drop to 4.85 V, it must rise back 5.8 V more just can the switch of enable (unlatching) power MOSFET again.
Flow into the current source of FB pin in the detection to load current, load current Io is mainly through the first resistance R1 return loop.Select the value of the first suitable resistance R1, corresponding voltage Vf value can be obtained on the 6th diode D6, the light signal that Vf makes D6 send produces photoelectric current on the first triode Q1, therefore, by selecting the value of the first suitable resistance R1, corresponding photoelectric current can be obtained on the first triode Q1, thus maintain the constant of load current Io.The value of the first resistance R1 is by formula: R=Vf/Io calculates, and wherein Vf is calculated by the current transfer ratio of optocoupler triode Q1 and 49uA.
At the first triode Q1 blocking interval, the 4th electric capacity C4 is charged to 5.8 V.When the first triode Q1 conducting, chip U1 utilizes the energy be stored in the 4th electric capacity C4 to power, and the power consumption of the 4th electric capacity C4 inside is extremely low, only relies on the electric current absorbed from drain lead just can normally work.
In addition, embodiment of the present invention circuit also has overheat protective function, and thermistor M1 detects the temperature of silicon chip, and threshold value can be arranged on 142 DEG C, and possesses the sluggish scope of 75 DEG C.When junction temperature exceedes this threshold value (142 DEG C), the switch of the first triode Q1 is prohibited, until junction temperature drops to less than 75 DEG C, the first triode Q1 just can reopen, and prevents that circuit is overheated to cause damage.
Should be appreciated that embodiment of the present invention electronic devices and components are directly provided by the voltage of drain lead in the power consumption of startup and duration of work, therefore can save the interlock circuit of biased power supply in BUCK and flyback converter.In addition, run into the failure condition of short circuit, open loop at circuit under, power output can be limited safely, and reduce the number of components and parts, directly can be reduced in the system-level cost for load protection circuit.
The voltage range of the embodiment of the present invention is applicable to global Width funtion (after 85VAC to 265VAC rectification).
The opto-coupled feedback constant current driver circuit for LED that the embodiment of the present invention provides and LED illumination device, this circuit keeps flow through the stable of load voltage by the electric current of control flow check overload, and without the need to transformer, embodiment of the present invention circuit structure is simple, failure rate is low, with low cost.
The embodiment of the present invention also provides a kind of LED illumination device, and described LED illumination device comprises above-mentioned opto-coupled feedback constant current driver circuit for LED.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. an opto-coupled feedback constant current driver circuit for LED, is characterized in that, comprising: chip U1, input protection circuit, feedback circuit, accumulator, current control circuit, overvoltage crowbar, wherein,
The negative pole of described input protection circuit is connected with described chip U1, for regulating input voltage, described feedback circuit is connected with described chip U1, for providing feedback for described chip U1, the voltage of stable output, described accumulator is connected with the positive pole of described chip U1 and described input protection circuit simultaneously, for store electrical energy, described current control circuit is connected with described accumulator, for regulating load electric current, be connected with the positive pole of described input protection circuit and described current control circuit while of described overvoltage crowbar, when losing efficacy for described feedback circuit, maintain the voltage of stable output.
2. circuit as claimed in claim 1; it is characterized in that; described input protection circuit comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
3. circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.
4. circuit as claimed in claim 3, it is characterized in that, described first triode Q1 comprises: optocoupler triode.
5. circuit as claimed in claim 1, it is characterized in that, described current control circuit is connected with described accumulator, and described accumulator comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of described 5th diode D5 is connected with the D pin of described chip U1, one end of the first inductance L 1 respectively, the negative electrode of described 5th diode D5 and described input protection circuit positive pole be connected.
6. circuit as claimed in claim 5, it is characterized in that, described current control circuit comprises: the 6th diode D6 and the first resistance R1, wherein,
The anode of described 6th diode D6 is connected with one end of described first resistance R1, and the negative electrode of described 6th diode D6 is connected with the other end of described first resistance R1 and the other end of the first inductance L 1.
7. circuit as claimed in claim 1, it is characterized in that, described 6th diode D6 comprises light-emitting diode.
8. circuit as claimed in claim 1, it is characterized in that, described overvoltage crowbar comprises: the second resistance R2, voltage-stabiliser tube Z1 and the 7th diode D7, wherein,
One end of described second resistance R2 is connected with the negative electrode of described 7th diode D7, and the other end of described first resistance R1 is connected with described current control circuit and load simultaneously;
The anode of described 7th diode D7 is connected with the anode of described voltage-stabiliser tube Z1, and the negative electrode of described voltage-stabiliser tube Z1 is connected with the positive pole of described input protection circuit and load simultaneously.
9. circuit as claimed in claim 8, it is characterized in that, described load comprises one or more LED.
10. a LED illumination device, is characterized in that, described LED illumination device comprises: the opto-coupled feedback constant current driver circuit for LED described in claim 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310635916.XA CN104684175B (en) | 2013-12-03 | 2013-12-03 | A kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310635916.XA CN104684175B (en) | 2013-12-03 | 2013-12-03 | A kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104684175A true CN104684175A (en) | 2015-06-03 |
| CN104684175B CN104684175B (en) | 2019-02-12 |
Family
ID=53318592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310635916.XA Active CN104684175B (en) | 2013-12-03 | 2013-12-03 | A kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104684175B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702835B (en) * | 2016-02-25 | 2020-03-03 | 三菱电机株式会社 | Power supply device, illumination lamp, and illumination device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN102843816A (en) * | 2011-06-24 | 2012-12-26 | 上海边光实业有限公司 | High-power LED (light emitting diode) power circuit |
| CN103248108A (en) * | 2013-05-16 | 2013-08-14 | 常州矽能电子科技有限公司 | LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module |
-
2013
- 2013-12-03 CN CN201310635916.XA patent/CN104684175B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN102843816A (en) * | 2011-06-24 | 2012-12-26 | 上海边光实业有限公司 | High-power LED (light emitting diode) power circuit |
| CN103248108A (en) * | 2013-05-16 | 2013-08-14 | 常州矽能电子科技有限公司 | LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702835B (en) * | 2016-02-25 | 2020-03-03 | 三菱电机株式会社 | Power supply device, illumination lamp, and illumination device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104684175B (en) | 2019-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102869148B (en) | Light-emitting diode driving circuit with open circuit protection | |
| US8872434B2 (en) | Constant-current-drive LED module device | |
| CN211240188U (en) | DOB integration LED constant current road | |
| US9504119B2 (en) | LED driver having short circuit protection | |
| CN103260310B (en) | LED light-dimmer driving circuit | |
| CN104470099B (en) | Light emitting diode driving circuit | |
| CN104115558B (en) | Accessory power supply for AC powered electronic devices | |
| US9986617B2 (en) | Light-emitting diode electrical circuitry for illumination | |
| CN104684177A (en) | Optical coupler feedback full-voltage LED (light emitting diode) driving circuit and LED illuminating equipment | |
| US10172193B2 (en) | DC power supply and its LED lamp and control system | |
| CN102647077A (en) | RCD (Resistance Capacitor Diode) absorption circuit, dimmable LED (Light-Emitting Diode) power supply system and dimming method | |
| CN104684175A (en) | Optical coupler feedback LED (light emitting diode) constant current driving circuit and LED illuminating equipment | |
| CN103200735B (en) | Light-emitting diode (LED) actuator preventing LED from flickering | |
| TW201334625A (en) | AC LED driver circuit for high-voltage AC power source | |
| CN104684176B (en) | A kind of opto-coupled feedback LED drive circuit and LED illumination device | |
| CN204948475U (en) | A kind of LED constant-current control circuit | |
| CN104684174A (en) | Optical coupler voltage-adjustable LED (light emitting diode) driving circuit and LED illuminating equipment | |
| US10440785B2 (en) | Current holding circuit for bidirectional triode thyristor dimmer and linear dimming driving circuit using the same | |
| CN104684128B (en) | A kind of LED drive circuit and lighting device | |
| CN106507549A (en) | LED drive power and system | |
| CN112165753A (en) | Emergency power supply module compatible with LED lamp | |
| CN202435653U (en) | Integration high-voltage power LED (light-emitting diode) drive chip | |
| CN102685969B (en) | LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit | |
| CN207265865U (en) | A kind of inverse-excitation type switch power-supply circuit | |
| JP5561467B2 (en) | LED lighting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |