CN202035185U - Light-emitting diode (LED) current feedback control circuit and television - Google Patents
Light-emitting diode (LED) current feedback control circuit and television Download PDFInfo
- Publication number
- CN202035185U CN202035185U CN2011200678488U CN201120067848U CN202035185U CN 202035185 U CN202035185 U CN 202035185U CN 2011200678488 U CN2011200678488 U CN 2011200678488U CN 201120067848 U CN201120067848 U CN 201120067848U CN 202035185 U CN202035185 U CN 202035185U
- Authority
- CN
- China
- Prior art keywords
- output
- current
- module
- feedback
- input
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model is suitable for a light-emitting diode (LED) driving circuit and provides an LED current feedback control circuit and a television. The LED current feedback control circuit comprises a switch power supply current supplying and regulating circuit, an isolation transformer module, a rectifying and filtering module, a current detecting and feedback module and a secondary filter module. The switch power supply current supplying and regulating circuit is utilized to receive a feedback current signal of the current detecting and feedback module and regulate the voltage of an output direct current electricity signal, the isolation transformer module isolates an interfering signal from the external power grid in the output direct current electricity signal and changes the voltage of the output direct current electricity signal, the rectifying and filtering module rectifies and filters the output direct current electricity signal, and finally the secondary filter module performs secondary filtering on the output direct current electricity signal, so that the LED is led to stay in a constant current closed-loop state and the purpose of preventing LED current thermal effect puncture is fulfilled.
Description
Technical field
The utility model belongs to the Current Control field, relates in particular to a kind of LED Current Feedback Control circuit and television set.
Background technology
(Light Emitting Diode is a kind of solid-state semiconductor device LED) to light-emitting diode, and it can directly change into visible light to electric energy.LED is a semiconductor wafer, and the one end is attached on the support, and an end is a negative pole, and the other end connects the positive pole of power supply, makes entire wafer by epoxy encapsulation.When LED is luminous, therefore light can produce reflection in epoxy resin, thereby causes the heat dispersion of LED own relatively poor, need use constant-current circuit in single or plurality of LEDs circuit, thereby control flows prevents that through the electric current of LED the thermal effect of electric current from puncturing LED.Because the regular tap power supply has only constant voltage output, output current changes with the variation of load, drive current can occur and exceed maximum rating, and the problem that punctured by heating effect of current of LED.
The utility model content
The purpose of this utility model is to provide a kind of LED Current Feedback Control circuit, and being intended to solve the regular tap power circuit can't provide constant current, the problem that causes LED to be punctured by heating effect of current easily for LED drives.
The utility model is achieved in that a kind of LED Current Feedback Control circuit, comprising:
Receive and adjust the switch power supply current supply of output DC signal and adjust circuit for the circuit supply of current and to feedback current;
Input is supplied with the output of adjusting circuit with described switch power supply current and is connected, to isolating the also isolation transformation module of conversion output DC signal from the interference signal of external electrical network in the output DC signal;
Input is connected with the output of described isolation transformation module, the output DC signal is carried out the rectification filtering module of rectifying and wave-filtering;
Input is connected with the output of described rectification filtering module, the output DC signal is detected and it is fed back to described switch power supply current supply with and current detecting and the feedback module of adjusting circuit; And
Input is connected with the output of feedback module with described current detecting, the output DC signal is carried out the secondary filtering module of filtering.
In the said structure, described isolation transformation module comprises an isolating transformer T101, first end of the first elementary winding of described isolating transformer T101 and second end are for isolating the input of transformation module, the second elementary winding sky of described isolating transformer T101 connects, first end of the secondary winding of described isolating transformer T101 is for isolating the output of transformation module, the second termination equipotential ground of the secondary winding of described isolating transformer T101.
In the said structure, described rectification filtering module comprises a diode D101 and an electrochemical capacitor C101, the anode of described diode D101 is the input of rectification filtering module, the negative electrode of described diode D101 is the output of rectification filtering module, be connected with the input of feedback module with current detecting with the positive pole of described electrochemical capacitor C101 respectively, the negative pole of described electrochemical capacitor C101 connects equipotential ground.
In the said structure, described current detecting and feedback module comprise resistance R 101, resistance R 102, resistance R 103, one positive-negative-positive triode Q101, an one voltage stabilizing didoe ZD101 and a photoelectrical coupler IC101, first end of described resistance R 101 is the input of current detecting and feedback module, be connected with the output of described rectification filtering module and the emitter of positive-negative-positive triode Q101 simultaneously, the base stage of described positive-negative-positive triode Q101 is connected with the negative electrode of described voltage stabilizing didoe ZD101 and second end of described resistance R 101 simultaneously, second end of described resistance R 101 is the output of current detecting and feedback module, the collector electrode of described positive-negative-positive triode Q101 is connected with the anode of described voltage stabilizing didoe ZD101 and first end of described resistance R 102 simultaneously, second end of described resistance R 102 is connected with the anode of the light-emitting diode of described photoelectrical coupler IC101, the negative electrode of the light-emitting diode of described photoelectrical coupler IC101 connects equipotential ground, the emitter of the reception phototriode of described photoelectrical coupler IC101 connects thermally end, the collector electrode of the reception phototriode of described photoelectrical coupler IC101 is supplied with the feedback input end of adjusting circuit with switch power supply current and is connected, first end of described resistance R 103 is connected with the positive pole of described voltage stabilizing didoe ZD101, the second termination equipotential ground of described resistance R 103.
In the said structure, described secondary filtering module comprises a leaded multilayer ceramic capacitor C102, and first end of described leaded multilayer ceramic capacitor C102 is connected with the output of feedback module with current detecting, the second termination equipotential ground of described leaded multilayer ceramic capacitor C102.
Another purpose of the present utility model is to provide a kind of television set, and described television set comprises LED Current Feedback Control circuit, and described LED Current Feedback Control circuit comprises:
Receive and adjust the switch power supply current supply of output DC signal and adjust circuit for the circuit supply of current and to feedback current;
Input is supplied with the output of adjusting circuit with described switch power supply current and is connected, to isolating the also isolation transformation module of conversion output DC signal from the interference signal of external electrical network in the output DC signal;
Input is connected with the output of described isolation transformation module, the output DC signal is carried out the rectification filtering module of rectifying and wave-filtering;
Input is connected with the output of described rectification filtering module, the output DC signal is detected and it is fed back to described switch power supply current supply with and current detecting and the feedback module of adjusting circuit; And
Input is connected with the output of feedback module with described current detecting, the output DC signal is carried out the secondary filtering module of filtering.
In the said structure, described isolation transformation module comprises an isolating transformer T101, first end of the first elementary winding of described isolating transformer T101 and second end are for isolating the input of transformation module, the second elementary winding sky of described isolating transformer T101 connects, first end of the secondary winding of described isolating transformer T101 is for isolating the output of transformation module, the second termination equipotential ground of the secondary winding of described isolating transformer T101.
In the said structure, described rectification filtering module comprises a diode D101 and an electrochemical capacitor C101, the anode of described diode D101 is the input of rectification filtering module, the negative electrode of described diode D101 is the output of rectification filtering module, be connected with the input of feedback module with current detecting with the positive pole of described electrochemical capacitor C101 respectively, the negative pole of described electrochemical capacitor C101 connects equipotential ground.
In the said structure, described current detecting and feedback module comprise resistance R 101, resistance R 102, resistance R 103, one positive-negative-positive triode Q101, an one voltage stabilizing didoe ZD101 and a photoelectrical coupler IC101, first end of described resistance R 101 is the input of current detecting and feedback module, be connected with the output of described rectification filtering module and the emitter of positive-negative-positive triode Q101 simultaneously, the base stage of described positive-negative-positive triode Q101 is connected with the negative electrode of described voltage stabilizing didoe ZD101 and second end of described resistance R 101 simultaneously, second end of described resistance R 101 is the output of current detecting and feedback module, the collector electrode of described positive-negative-positive triode Q101 is connected with the anode of described voltage stabilizing didoe ZD101 and first end of described resistance R 102 simultaneously, second end of described resistance R 102 is connected with the anode of the light-emitting diode of described photoelectrical coupler IC101, the negative electrode of the light-emitting diode of described photoelectrical coupler IC101 connects equipotential ground, the emitter of the reception phototriode of described photoelectrical coupler IC101 connects thermally end, the collector electrode of the reception phototriode of described photoelectrical coupler IC101 is supplied with the feedback input end of adjusting circuit with switch power supply current and is connected, first end of described resistance R 103 is connected with the positive pole of described voltage stabilizing didoe ZD101, the second termination equipotential ground of described resistance R 103.
In the said structure, described secondary filtering module comprises a leaded multilayer ceramic capacitor C102, and first end of described leaded multilayer ceramic capacitor C102 is connected with the output of feedback module with current detecting, the second termination equipotential ground of described leaded multilayer ceramic capacitor C102.
In the utility model, supply with and adjust the feedback current signal of circuit and receive and adjust the output DC voltage of signals by switch power supply current current detecting and feedback module, and isolate the transformation module to isolating and conversion output DC signal from the interference signal of external electrical network in the output DC signal, by rectification filtering module the output DC signal is carried out rectifying and wave-filtering again, by the secondary filtering module output DC signal is carried out secondary filtering at last, thereby make LED be in constant current closed-loop control state, reach the purpose that prevents that the LED heating effect of current from puncturing.
Description of drawings
Fig. 1 is the structure chart of the LED Current Feedback Control circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit figure of the LED Current Feedback Control circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Receive and adjust the output DC voltage of signals by the switch power supply current supply with adjusting the feedback current signal of circuit, make LED be in constant current closed-loop control state, reach the purpose that prevents that the LED heating effect of current from puncturing current detecting and feedback module.
Fig. 1 shows the structure of the line detection apparatus that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model.
LED Current Feedback Control circuit comprises:
Switch power supply current is supplied with and is adjusted circuit 101, isolates transformation module 102, rectification filtering module 103, current detecting and feedback module 104 and secondary filtering module 105.
Switch power supply current is supplied with adjustment circuit 101 and is received and adjust the output DC signal for the circuit supply of current and to feedback current;
The input of isolating transformation module 102 is connected with the output of adjusting circuit 101 with the switch power supply current supply, to isolating and conversion output DC signal from the interference signal of external electrical network in the output DC signal;
The input of rectification filtering module 103 is connected with the output of isolating transformation module 102, and the output DC signal is carried out rectifying and wave-filtering;
Current detecting is connected with the output of rectification filtering module 103 with the input of feedback module 104, the output DC signal is detected and it is fed back to switch power supply current supply with and the adjustment circuit;
The input of secondary filtering module 105 is connected with the output of current detecting with feedback module 104, the output DC signal is carried out the secondary filtering module of filtering.
Fig. 2 shows the exemplary circuit structure of the LED Current Feedback Control circuit that the utility model one embodiment provides.
As the utility model one embodiment, isolate transformation module 102 and comprise an isolating transformer T101, first end 1 of the first elementary winding of isolating transformer T101 and second end 2 are for isolating the input of transformation module 102, the second elementary winding sky of isolating transformer T101 connects, first end 3 of the secondary winding of isolating transformer T101 is for isolating the output of transformation module, and second end 4 of the secondary winding of isolating transformer T101 connects equipotential ground.
The anode of diode D101 is the input of rectification filtering module 103, the negative electrode of diode D101 is the output of rectification filtering module 103, be connected with the input of current detecting with feedback module 104 with the positive pole of electrochemical capacitor C101 respectively, the negative pole of electrochemical capacitor C101 connects equipotential ground.
Current detecting and feedback module 104 comprise resistance R 101, resistance R 102, resistance R 103, positive-negative-positive triode Q101, voltage stabilizing didoe ZD101 and photoelectrical coupler IC101.
First end of resistance R 101 is the input of current detecting and feedback module, be connected with the output of rectification filtering module and the emitter of positive-negative-positive triode Q101 simultaneously, the base stage of positive-negative-positive triode Q101 is connected with the negative electrode of voltage stabilizing didoe ZD101 and second end of resistance R 101 simultaneously, second end of resistance R 101 is the output of current detecting and feedback module, the collector electrode of positive-negative-positive triode Q101 is connected with the anode of voltage stabilizing didoe ZD101 and first end of resistance R 102 simultaneously, second end of resistance R 102 is connected with the anode of the light-emitting diode of photoelectrical coupler IC101, the negative electrode of the light-emitting diode of photoelectrical coupler IC101 connects equipotential ground, the emitter of the reception phototriode of photoelectrical coupler IC101 connects thermally end, the collector electrode of the reception phototriode of photoelectrical coupler IC101 is supplied with the feedback input end of adjusting circuit 101 with switch power supply current and is connected, first end of resistance R 103 is connected with the positive pole of voltage stabilizing didoe ZD101, the second termination equipotential ground of resistance R 103.
The anode of LED 1 is connected with second end of resistance R 101 and first end of leaded multilayer ceramic capacitor C102 simultaneously, the negative electrode of LED 1 is connected with the anode of LED 2, the negative electrode of LED 2 is connected with the anode of LED 3, and the negative electrode of LED 3 connects equipotential ground.
The utility model embodiment also provides a kind of television set that comprises above-mentioned LED Current Feedback Control circuit.
Operation principle is:
When the utility model LED Current Feedback Control circuit is used for the LED driving, after the output DC signal of switch power supply current supply and adjusting module 101 carries out transformation and interference signal isolation by isolating transformer T101, carry out rectification by diode D101, electrochemical capacitor C101 carries out filtering, the resistance R 101 of flowing through again, carry out secondary filtering by leaded multilayer ceramic capacitor C102, enter LED load circuit 106 at last, driving LED is luminous.
The load current of LED load circuit 106 is exactly a definite value after designing.When the electric current of LED load circuit 106 increases, the corresponding increase of current value of the output DC signal of the resistance R of flowing through 101, the voltage at resistance R 101 two ends also increases thereupon, make emitter junction and the collector junction of positive-negative-positive triode Q101 all be in the forward bias state, positive-negative-positive triode Q101 saturation conduction, its collector current increases.The dc signal that increases enters photoelectrical coupler IC101 by positive-negative-positive triode Q101 by resistance R 102, photoelectrical coupler IC101 is coupled to the reception phototriode of photoelectrical coupler IC101 by the mode of photoelectricity coupling with the dc signal that increases, and dc signal is fed back to the feedback input end of switch power supply current supply and adjusting module 101 by the collector electrode output of the reception phototriode of photoelectrical coupler IC101.Because the increase of current feedback amount, the pulse-width controller in switch power supply current supply and the adjusting module 101 can reduce its output duty of ratio, thereby reduce the electric current of output DC signal.Otherwise, when the electric current of LED load circuit 106 reduces, switch power supply current supply with adjusting module 101 in pulse-width controller can increase its output duty of ratio, thereby increase the electric current of output DC signal according to the reducing of current feedback amount.
In the utility model, supply with and adjust the feedback current signal of circuit and receive and adjust the output DC voltage of signals by switch power supply current current detecting and feedback module, and isolate the transformation module to isolating and conversion output DC signal from the interference signal of external electrical network in the output DC signal, by rectification filtering module the output DC signal is carried out rectifying and wave-filtering again, by the secondary filtering module output DC signal is carried out secondary filtering at last, thereby make LED constant current closed-loop control when certain voltage, reach the purpose that prevents that the LED heating effect of current from puncturing.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. a LED Current Feedback Control circuit is characterized in that, LED Current Feedback Control circuit comprises:
Receive and adjust the switch power supply current supply of output DC signal and adjust circuit for the circuit supply of current and to feedback current;
Input is supplied with the output of adjusting circuit with described switch power supply current and is connected, to isolating the also isolation transformation module of conversion output DC signal from the interference signal of external electrical network in the output DC signal;
Input is connected with the output of described isolation transformation module, the output DC signal is carried out the rectification filtering module of rectifying and wave-filtering;
Input is connected with the output of described rectification filtering module, the output DC signal is detected and it is fed back to described switch power supply current supply with and current detecting and the feedback module of adjusting circuit; And
Input is connected with the output of feedback module with described current detecting, the output DC signal is carried out the secondary filtering module of filtering.
2. LED Current Feedback Control circuit as claimed in claim 1, it is characterized in that, described isolation transformation module comprises an isolating transformer T101, first end of the first elementary winding of described isolating transformer T101 and second end are for isolating the input of transformation module, the second elementary winding sky of described isolating transformer T101 connects, first end of the secondary winding of described isolating transformer T101 is for isolating the output of transformation module, the second termination equipotential ground of the secondary winding of described isolating transformer T101.
3. LED Current Feedback Control circuit as claimed in claim 1, it is characterized in that, described rectification filtering module comprises a diode D101 and an electrochemical capacitor C101, the anode of described diode D101 is the input of rectification filtering module, the negative electrode of described diode D101 is the output of rectification filtering module, be connected with the input of feedback module with current detecting with the positive pole of described electrochemical capacitor C101 respectively, the negative pole of described electrochemical capacitor C101 connects equipotential ground.
4. LED Current Feedback Control circuit as claimed in claim 1, it is characterized in that, described current detecting and feedback module comprise resistance R 101, resistance R 102, resistance R 103, one positive-negative-positive triode Q101, an one voltage stabilizing didoe ZD101 and a photoelectrical coupler IC101, first end of described resistance R 101 is the input of current detecting and feedback module, be connected with the output of described rectification filtering module and the emitter of positive-negative-positive triode Q101 simultaneously, the base stage of described positive-negative-positive triode Q101 is connected with the negative electrode of described voltage stabilizing didoe ZD101 and second end of described resistance R 101 simultaneously, second end of described resistance R 101 is the output of current detecting and feedback module, the collector electrode of described positive-negative-positive triode Q101 is connected with the anode of described voltage stabilizing didoe ZD101 and first end of described resistance R 102 simultaneously, second end of described resistance R 102 is connected with the anode of the light-emitting diode of described photoelectrical coupler IC101, the negative electrode of the light-emitting diode of described photoelectrical coupler IC101 connects equipotential ground, the emitter of the reception phototriode of described photoelectrical coupler IC101 connects thermally end, the collector electrode of the reception phototriode of described photoelectrical coupler IC101 is supplied with the feedback input end of adjusting circuit with switch power supply current and is connected, first end of described resistance R 103 is connected with the positive pole of described voltage stabilizing didoe ZD101, the second termination equipotential ground of described resistance R 103.
5. LED Current Feedback Control circuit as claimed in claim 1, it is characterized in that, described secondary filtering module comprises a leaded multilayer ceramic capacitor C102, and first end of described leaded multilayer ceramic capacitor C102 is connected with the output of feedback module with current detecting, the second termination equipotential ground of described leaded multilayer ceramic capacitor C102.
6. a television set is characterized in that, described television set comprises LED Current Feedback Control circuit, and described LED Current Feedback Control circuit comprises:
Receive and adjust the switch power supply current supply of output DC signal and adjust circuit for the circuit supply of current and to feedback current;
Input is supplied with the output of adjusting circuit with described switch power supply current and is connected, to isolating the also isolation transformation module of conversion output DC signal from the interference signal of external electrical network in the output DC signal;
Input is connected with the output of described isolation transformation module, the output DC signal is carried out the rectification filtering module of rectifying and wave-filtering;
Input is connected with the output of described rectification filtering module, the output DC signal is detected and it is fed back to described switch power supply current supply with and current detecting and the feedback module of adjusting circuit; And
Input is connected with the output of feedback module with described current detecting, the output DC signal is carried out the secondary filtering module of filtering.
7. television set as claimed in claim 6, it is characterized in that, described isolation transformation module comprises an isolating transformer T101, first end of the first elementary winding of described isolating transformer T101 and second end are for isolating the input of transformation module, the second elementary winding sky of described isolating transformer T101 connects, first end of the secondary winding of described isolating transformer T101 is for isolating the output of transformation module, the second termination equipotential ground of the secondary winding of described isolating transformer T101.
8. television set as claimed in claim 6, it is characterized in that, described rectification filtering module comprises a diode D101 and an electrochemical capacitor C101, the anode of described diode D101 is the input of rectification filtering module, the negative electrode of described diode D101 is the output of rectification filtering module, be connected with the input of feedback module with current detecting with the positive pole of described electrochemical capacitor C101 respectively, the negative pole of described electrochemical capacitor C101 connects equipotential ground.
9. television set as claimed in claim 6, it is characterized in that, described current detecting and feedback module comprise resistance R 101, resistance R 102, resistance R 103, one positive-negative-positive triode Q101, an one voltage stabilizing didoe ZD101 and a photoelectrical coupler IC101, first end of described resistance R 101 is the input of current detecting and feedback module, be connected with the output of described rectification filtering module and the emitter of positive-negative-positive triode Q101 simultaneously, the base stage of described positive-negative-positive triode Q101 is connected with the negative electrode of described voltage stabilizing didoe ZD101 and second end of described resistance R 101 simultaneously, second end of described resistance R 101 is the output of current detecting and feedback module, the collector electrode of described positive-negative-positive triode Q101 is connected with the anode of described voltage stabilizing didoe ZD101 and first end of described resistance R 102 simultaneously, second end of described resistance R 102 is connected with the anode of the light-emitting diode of described photoelectrical coupler IC101, the negative electrode of the light-emitting diode of described photoelectrical coupler IC101 connects equipotential ground, the emitter of the reception phototriode of described photoelectrical coupler IC101 connects thermally end, the collector electrode of the reception phototriode of described photoelectrical coupler IC101 is supplied with the feedback input end of adjusting circuit with switch power supply current and is connected, first end of described resistance R 103 is connected with the positive pole of described voltage stabilizing didoe ZD101, the second termination equipotential ground of described resistance R 103.
10. television set as claimed in claim 6, it is characterized in that, described secondary filtering module comprises a leaded multilayer ceramic capacitor C102, and first end of described leaded multilayer ceramic capacitor C102 is connected with the output of feedback module with current detecting, the second termination equipotential ground of described leaded multilayer ceramic capacitor C102.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200678488U CN202035185U (en) | 2011-03-15 | 2011-03-15 | Light-emitting diode (LED) current feedback control circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200678488U CN202035185U (en) | 2011-03-15 | 2011-03-15 | Light-emitting diode (LED) current feedback control circuit and television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202035185U true CN202035185U (en) | 2011-11-09 |
Family
ID=44897465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200678488U Expired - Fee Related CN202035185U (en) | 2011-03-15 | 2011-03-15 | Light-emitting diode (LED) current feedback control circuit and television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202035185U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520758A (en) * | 2011-12-15 | 2012-06-27 | 濮阳三友电器有限公司 | Automatic current control circuit and circuit current control method |
| CN104754796A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | LED (Light Emitting Diode) constant current driving circuit |
| CN112014621A (en) * | 2020-08-03 | 2020-12-01 | 深圳创维－Rgb电子有限公司 | Current detection circuit, switching power supply and television |
-
2011
- 2011-03-15 CN CN2011200678488U patent/CN202035185U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520758A (en) * | 2011-12-15 | 2012-06-27 | 濮阳三友电器有限公司 | Automatic current control circuit and circuit current control method |
| CN104754796A (en) * | 2013-12-26 | 2015-07-01 | 欧普照明股份有限公司 | LED (Light Emitting Diode) constant current driving circuit |
| CN112014621A (en) * | 2020-08-03 | 2020-12-01 | 深圳创维－Rgb电子有限公司 | Current detection circuit, switching power supply and television |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203788154U (en) | Multipath output DC/DC secondary power supply system | |
| CN103037585B (en) | Distributed light-emitting diode (LED) lamp and drive power supply plug-in plug-out protective circuit thereof | |
| CN103813595A (en) | Efficient power source capable of supplying electricity in constant voltage and constant current alternation mode | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN201846423U (en) | LED backlight television and power source used for same | |
| CN104185333A (en) | Constant-current constant-voltage circuit and illuminating device | |
| CN102711331B (en) | LED drive power supply | |
| CN202035185U (en) | Light-emitting diode (LED) current feedback control circuit and television | |
| CN203761633U (en) | Energy-saving LED traffic light with long service life | |
| CN204922823U (en) | Adjustable power is adjusted luminance to mix colours and is reviewed LED street lamp | |
| CN102238784B (en) | Light-emitting diode (LED) power supply driving circuit | |
| CN202111796U (en) | Constant current drive circuit and television set | |
| CN205017630U (en) | LED drive power supply adjusts luminance and turn -offs control circuit | |
| CN201491341U (en) | High-power led power supply circuit | |
| CN202696962U (en) | Light emitting diode (LED) driving power supply | |
| CN203015236U (en) | A LED driving power supply | |
| CN203039967U (en) | Split LED lamp and split LED lamp driving power supply insertion and extraction protection circuit | |
| CN103415118B (en) | Backlight drive circuit, electronic installation and backlight driving method | |
| CN202231900U (en) | LED power supply drive circuit | |
| CN201418067Y (en) | Intelligent remote control switch with magnetic latching relay | |
| CN106535420B (en) | LED drive circuit | |
| CN204498045U (en) | Phototube Coupling power supply | |
| CN202634853U (en) | Power-saving light emitting diode driver | |
| CN203632906U (en) | Silicon controlled rectifier-dimming LED driving switching power supply circuit | |
| CN202396044U (en) | LED (light-emitting diode) driving circuit and LED light fitting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20150315 |
|
| EXPY | Termination of patent right or utility model |