CN204465942U - Transformer primary side sampling LED control system - Google Patents
Transformer primary side sampling LED control system Download PDFInfo
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- CN204465942U CN204465942U CN201520042060.XU CN201520042060U CN204465942U CN 204465942 U CN204465942 U CN 204465942U CN 201520042060 U CN201520042060 U CN 201520042060U CN 204465942 U CN204465942 U CN 204465942U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of transformer primary side sampling LED control system.Transformer primary side sampling LED control system comprises rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and sampling feedback circuit, and described sampling feedback circuit draws together the 3rd resistance, the 4th resistance, the 5th resistance, the 5th electric capacity, the first voltage-stabiliser tube, the first operational amplifier, the 6th resistance and the 7th resistance.The mode that the transformer primary side sampling LED control system utilizing the utility model to provide can feed back to switch type power supply converter circuit by real-time sampling transformer primary side and then control power tube duty ratio carrys out the control system of stabilizing LED current.
Description
Technical field
The utility model relates to switching power circuit, refers more particularly to transformer primary side sampling LED control system.
Background technology
LED control system is based on switching power circuit design, and simultaneously in LED control system circuit, the monitoring of LED current is the very important part of circuit design, and electric current is crossed conference and LED is burnt out, and the too small meeting of electric current makes LED luminance inadequate.
Summary of the invention
The utility model aims to provide the control system that a kind of mode feeding back to switch type power supply converter circuit by real-time sampling transformer primary side and then control power tube duty ratio carrys out stabilizing LED current.
Transformer primary side sampling LED control system, comprises rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and sampling feedback circuit:
Described rectification circuit be connected to power circuit input for receiving ac input voltage;
Described switch type power supply converter circuit be to described rectifier circuit rectifies after input voltage with respond the input voltage after rectification generate regulate output voltage;
Described half-bridge driven output circuit is that the voltage half bridge output filtering that described switch type power supply converter circuit exports is obtained direct voltage drive LED;
Described sampling feedback circuit feeds back to described switch type power supply converter circuit by sampling transformer primary side to carry out stabilizing LED current in the mode of Modulating Power pipe duty ratio.
Described rectification circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode:
The P pole ground connection of described first diode, N pole connects one end of ac input voltage and the P pole of described second diode;
The P pole of described second diode connects one end of ac input voltage and the N pole of described first diode, and N pole connects the N pole of described 4th diode and described switch type power supply converter circuit and described sampling feedback circuit;
The P pole ground connection of described 3rd diode, N pole connects the other end of ac input voltage and the P pole of described 4th diode;
The P pole of described 4th diode connects the other end of ac input voltage and the N pole of described 3rd diode, and N pole connects the N pole of described second diode and described switch type power supply converter circuit and described sampling feedback circuit.
Described switch type power supply converter circuit comprises the first electric capacity, the first resistance, the second electric capacity, the 3rd electric capacity, the second resistance, the 5th diode, transformer primary side, PWM generation circuit and power NMOS tube:
The N pole of the second diode described in one termination of described first electric capacity and one end of the N pole of described 4th diode and one end of described first resistance and described 3rd electric capacity and one end of described second resistance and one end of described transformer primary side and described sampling feedback circuit, other end ground connection;
The N pole of the second diode described in one termination of described first resistance and one end of the N pole of described 4th diode and one end of described first electric capacity and described 3rd electric capacity and one end of described second resistance and one end of described transformer primary side and described sampling feedback circuit, the power supply VCC that one end of the second electric capacity described in another termination and described PWM produce circuit holds;
The power supply VCC that one end of first resistance described in one termination of described second electric capacity and described PWM produce circuit holds, other end ground connection;
Described first resistance and described second electric capacity produce the power end VCC that described PWM produces circuit, and described first resistance plays the effect of step-down and current limliting, and described second electric capacity plays the effect of filtering;
The N pole of the second diode described in one termination of described 3rd electric capacity and one end of the N pole of described 4th diode and one end of described first electric capacity and described first resistance and one end of described second resistance and one end of described transformer primary side and described sampling feedback circuit, the other end of the second resistance described in another termination and the N pole of described 5th diode;
The N pole of the second diode described in one termination of described second resistance and one end of the N pole of described 4th diode and one end of described first electric capacity and described first resistance and one end of described 3rd electric capacity and described transformer primary side and described sampling feedback circuit, the other end of the 3rd electric capacity described in another termination and the N pole of described 5th diode;
The P pole of described 5th diode connects the other end of described transformer primary side and the drain electrode of described power NMOS tube, and N pole connects one end of described 3rd electric capacity and one end of described second resistance;
Described 3rd electric capacity, described second resistance and described 5th diode composition clamp circuit;
The N pole of the second diode described in one termination of described transformer primary side and one end of one end of the N pole of described 4th diode and one end of described first electric capacity and described first resistance and one end of described second resistance and described 3rd electric capacity and described sampling feedback circuit, the P pole of the 5th diode described in another termination and the drain electrode of described power NMOS tube;
It is produce pwm signal to drive described power NMOS tube that described PWM produces circuit, described in the Voltage Feedback FB termination of described PWM generation circuit, the output of sampling feedback circuit, carrys out PWM described in regulable control according to the height of the output end voltage of described sampling feedback circuit and produces the duty ratio of the pulse-width signal end GT of circuit and then drive the grid of described power NMOS tube to reach the electric current of indirect regulation LED;
The grid of described power NMOS tube meets the pulse-width signal output GT that described PWM produces circuit, and drain electrode connects the described P pole of the 5th diode and one end of described transformer primary side, source ground.
Described half-bridge driven output circuit comprises transformer secondary, the 6th diode, the 4th electric capacity, a LED, the 2nd LED and the 3rd LED:
The P pole of the 6th diode described in one termination of described transformer secondary, other end ground connection;
The P pole of described 6th diode connects one end of described transformer secondary, and N pole connects one end of described 4th electric capacity and the P pole of a described LED;
The N pole of the 6th diode described in one termination of described 4th electric capacity and the P pole of a described LED, other end ground connection;
The P pole of a described LED connects the N pole of described 6th diode and one end of described 4th electric capacity, and N pole connects the P pole of described 2nd LED;
The P pole of described 2nd LED connects the N pole of a described LED, and N pole connects the P pole of described 3rd LED;
The P pole of described 3rd LED connects the N pole of described 2nd LED, N pole ground connection.
Described sampling feedback circuit draws together the 3rd resistance, the 4th resistance, the 5th resistance, the 5th electric capacity, the first voltage-stabiliser tube, the first operational amplifier, the 6th resistance and the 7th resistance:
One end of the N pole of one end of the first electric capacity and the N pole of described second diode and described 4th diode and one end of described first resistance and described 3rd electric capacity described in one termination of described 3rd resistance and one end of described second resistance and one end of described transformer primary side, this end will near one end of described transformer primary side, one end of the 4th resistance described in another termination and one end of described 5th resistance;
One end of 3rd resistance described in one termination of described 4th resistance and one end of described 5th resistance, other end ground connection;
One end of 3rd resistance described in one termination of described 5th resistance and one end of described 4th resistance, the positive input terminal of one end of the 5th electric capacity described in another termination and the N pole of described first voltage-stabiliser tube and described first operational amplifier;
The positive input terminal of one end of the 5th resistance and the N pole of described first voltage-stabiliser tube and described first operational amplifier described in one termination of described 5th electric capacity, other end ground connection;
The P pole ground connection of described first voltage-stabiliser tube, N pole connects one end of described 5th electric capacity and one end of described 5th resistance and the positive input terminal of described first operational amplifier;
Described first voltage-stabiliser tube carries out clamp to the direct voltage produced by the voltage waveform of described transformer primary side end of sampling and through the low pass filter of described 5th resistance and described 5th electric capacity composition, can indirectly control to export the current amplitude of driving LED;
One end of 5th electric capacity described in the positive input termination of described first operational amplifier and one end of described 5th resistance and the N pole of described first voltage-stabiliser tube, one end of 6th resistance described in negative input termination and one end of described 7th resistance, export PWM described in termination and produce the FB end of circuit and one end of described 6th resistance;
The output of the first operational amplifier described in one termination of described 6th resistance and described PWM produce the FB end of circuit, one end of the 7th resistance described in another termination and the negative input end of described first operational amplifier;
One end of 6th resistance described in one termination of described 7th resistance and the negative input end of described first operational amplifier, other end ground connection.
Described first operational amplifier, described 6th resistance and described 7th resistance composition amplifying circuit, multiplication factor is (1+ the 6th resistance/the 7th resistance); By the output voltage regulating the ratio of described 6th resistance and described 7th resistance can regulate described first operational amplifier, regulation output voltage being so just used for more easily with the magnitude of voltage coordinating described PWM to produce the FB end of circuit, regulating when not increasing power; The FB end also having the adjustment of a kind of method to feed back to described PWM generation circuit is the resistance value by regulating described 4th resistance, increase resistance value and certainly will increase system power, obvious this method is not more economized by the method power of the ratio regulating described 6th resistance and described 7th resistance.
Described sampling feedback circuit is voltage signal by responding to described transformer primary side and is converted to feedback voltage, described transformer primary side be with flow through real-time driving LED current signal be coupling, described 3rd resistance becomes bleeder circuit to carry out dividing potential drop to the voltage on described transformer primary side with described 4th resistor group, waveform is consistent with the waveform on described transformer primary side, then low-frequency d voltage is left again by described first operational amplifier by the low pass filter of described 5th resistance and described 5th electric capacity composition, described 6th resistance and described 7th resistance composition amplifying circuit amplify direct voltage and feed back to the FB end that described PWM produces circuit, described 4th ohmically voltage is proportional with the electric current of driving LED, make to feed back to described PWM and produce the voltage of the FB end of circuit to be equipped with, the direct voltage of this setting changes along with the change exporting driving LED electric current, described PWM produces circuit and exports corresponding duty ratio according to the height of feedback voltage, like this with regard to the driving LED electric current of stable output.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of transformer primary side of the present utility model sampling LED control system.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
Transformer primary side sampling LED control system, as shown in Figure 1, comprises rectification circuit 100, switch type power supply converter circuit 200, half-bridge driven output circuit 300 and sampling feedback circuit 400:
Described rectification circuit 100 be connected to power circuit input for receiving ac input voltage;
Described switch type power supply converter circuit 200 be to the rectification of described rectification circuit 100 after input voltage with respond the input voltage after rectification generate regulate output voltage;
Described half-bridge driven output circuit 300 is that the voltage half bridge output filtering that described switch type power supply converter circuit 200 exports is obtained direct voltage drive LED;
Described sampling feedback circuit 400 feeds back to described switch type power supply converter circuit by sampling transformer primary side
200 carry out stabilizing LED current in the mode of Modulating Power pipe duty ratio.
Described rectification circuit 100 comprises the first diode 101, second diode 102, the 3rd diode 103 and the 4th diode 104:
The P pole ground connection of described first diode 101, N pole connects one end of ac input voltage and the P pole of described second diode 102;
The P pole of described second diode 102 connects one end of ac input voltage and the N pole of described first diode 101, and N pole connects the N pole of described 4th diode 104 and described switch type power supply converter circuit 200 and described sampling feedback circuit 400;
The P pole ground connection of described 3rd diode 103, N pole connects the other end of ac input voltage and the P pole of described 4th diode 104;
The P pole of described 4th diode 104 connects the other end of ac input voltage and the N pole of described 3rd diode 103, and N pole connects the N pole of described second diode 102 and described switch type power supply converter circuit 200 and described sampling feedback circuit 400.
Described switch type power supply converter circuit 200 comprises the first electric capacity 201, first resistance 202, second electric capacity 203, the 3rd electric capacity 207, second resistance 208, the 5th diode 209, transformer primary side 206, PWM generation circuit 204 and power NMOS tube 205:
One end of the N pole of the second diode 102 described in one termination of described first electric capacity 201 and the N pole of described 4th diode 104 and described first resistance 202 and one end of described 3rd electric capacity 207 and described one end of second resistance 208 and one end of described transformer primary side 206 and described sampling feedback circuit 400, other end ground connection;
One end of the N pole of the second diode 102 described in one termination of described first resistance 202 and the N pole of described 4th diode 104 and described first electric capacity 201 and one end of described 3rd electric capacity 207 and described one end of second resistance 208 and one end of described transformer primary side 206 and described sampling feedback circuit 400, the power supply VCC that one end of the second electric capacity 203 described in another termination and described PWM produce circuit 204 holds;
The power supply VCC that one end of first resistance 202 described in one termination of described second electric capacity 203 and described PWM produce circuit 204 holds, other end ground connection;
Described first resistance 202 and described second electric capacity 203 produce the power end VCC that described PWM produces circuit 204, and described first resistance 202 plays the effect of step-down and current limliting, and described second electric capacity 203 plays the effect of filtering;
One end of the N pole of the second diode 102 described in one termination of described 3rd electric capacity 207 and the N pole of described 4th diode 104 and described first electric capacity 201 and one end of described first resistance 202 and described one end of second resistance 208 and one end of described transformer primary side 206 and described sampling feedback circuit 400, the other end of the second resistance 208 described in another termination and the N pole of described 5th diode 209;
One end of one end of the N pole of the second diode 102 described in one termination of described second resistance 208 and the N pole of described 4th diode 104 and described first electric capacity 201 and one end of described first resistance 202 and described 3rd electric capacity 207 and described transformer primary side 206 and described sampling feedback circuit 400, the other end of the 3rd electric capacity 207 described in another termination and the N pole of described 5th diode 209;
The P pole of described 5th diode 209 connects the other end of described transformer primary side 206 and the drain electrode of described power NMOS tube 205, and N pole connects one end of described 3rd electric capacity 207 and one end of described second resistance 208;
Described 3rd electric capacity 207, described second resistance 208 and described 5th diode 209 form clamp circuit;
One end of one end of the N pole of the second diode 102 described in one termination of described transformer primary side 206 and the N pole of described 4th diode 104 and described first electric capacity 201 and one end of described first resistance 202 and described second resistance 208 and one end of described 3rd electric capacity 207 and described sampling feedback circuit 400, the P pole of the 5th diode 209 described in another termination and the drain electrode of described power NMOS tube 205;
It is produce pwm signal to drive described power NMOS tube 205 that described PWM produces circuit 204, described in the Voltage Feedback FB termination of described PWM generation circuit 204, the output of sampling feedback circuit 400, carrys out PWM described in regulable control according to the height of the output end voltage of described sampling feedback circuit 400 and produces the duty ratio of the pulse-width signal end GT of circuit 204 and then drive the grid of described power NMOS tube 205 to reach the electric current of indirect regulation LED;
The grid of described power NMOS tube 205 meets the pulse-width signal output GT that described PWM produces circuit 204, and drain electrode connects the described P pole of the 5th diode 209 and one end of described transformer primary side 206, source ground.
Described half-bridge driven output circuit 300 comprises transformer secondary 301, the 6th diode 302, the 4th electric capacity 303, a LED304, the 2nd LED305 and the 3rd LED306:
The P pole of the 6th diode 302 described in one termination of described transformer secondary 301, other end ground connection;
The P pole of described 6th diode 302 connects one end of described transformer secondary 301, and N pole connects one end of described 4th electric capacity 303 and the P pole of a described LED304;
The N pole of the 6th diode 302 described in one termination of described 4th electric capacity 303 and the P pole of a described LED304, other end ground connection;
The P pole of a described LED304 connects the N pole of described 6th diode 302 and one end of described 4th electric capacity 303, and N pole connects the P pole of described 2nd LED305;
The P pole of described 2nd LED305 connects the N pole of a described LED304, and N pole connects the P pole of described 3rd LED306;
The P pole of described 3rd LED306 connects the N pole of described 2nd LED305, N pole ground connection.
Described sampling feedback circuit 400 comprises the 3rd resistance 401, the 4th resistance 402, the 5th resistance 403, the 5th electric capacity 404, first voltage-stabiliser tube 405, first operational amplifier 406, the 6th resistance 407 and the 7th resistance 408:
One end of the N pole of one end of the first electric capacity 201 described in one termination of described 3rd resistance 401 and the N pole of described second diode 102 and described 4th diode 104 and one end of described first resistance 202 and described 3rd electric capacity 207 and described one end of second resistance 208 and one end of described transformer primary side 206, this end will near one end of described transformer primary side 206, one end of the 4th resistance 402 described in another termination and one end of described 5th resistance 403;
One end of 3rd resistance 401 described in one termination of described 4th resistance 402 and one end of described 5th resistance 403, other end ground connection;
One end of 3rd resistance 401 described in one termination of described 5th resistance 403 and one end of described 4th resistance 402, the positive input terminal of one end of the 5th electric capacity 404 described in another termination and the N pole of described first voltage-stabiliser tube 405 and described first operational amplifier 406;
The positive input terminal of one end of the 5th resistance 403 described in one termination of described 5th electric capacity 404 and the N pole of described first voltage-stabiliser tube 405 and described first operational amplifier 406, other end ground connection;
The P pole ground connection of described first voltage-stabiliser tube 405, N pole connects the positive input terminal of one end of described 5th electric capacity 404 and one end of described 5th resistance 403 and described first operational amplifier 406;
Described first voltage-stabiliser tube 405 is to carrying out clamp through the direct voltage that the low pass filter that described 5th resistance 403 and described 5th electric capacity 404 form produces by the voltage waveform of described transformer primary side 206 end of sampling, can indirectly controlling to export the current amplitude of driving LED;
The N pole of one end of the 5th electric capacity 404 described in the positive input termination of described first operational amplifier 406 and one end of described 5th resistance 403 and described first voltage-stabiliser tube 405, one end of 6th resistance 407 described in negative input termination and one end of described 7th resistance 408, export PWM described in termination and produce the FB end of circuit 204 and one end of described 6th resistance 407;
The output of the first operational amplifier 406 described in one termination of described 6th resistance 407 and described PWM produce the FB end of circuit 204, one end of the 7th resistance 408 described in another termination and the negative input end of described first operational amplifier 406;
One end of 6th resistance 407 described in one termination of described 7th resistance 408 and the negative input end of described first operational amplifier 406, other end ground connection.
Described first operational amplifier 406, described 6th resistance 407 and described 7th resistance 408 form amplifying circuit, and multiplication factor is (1+ the 6th resistance/the 7th resistance); By the output voltage regulating the ratio of described 6th resistance 407 and described 7th resistance 408 can regulate described first operational amplifier 406, regulation output voltage being so just used for more easily with the magnitude of voltage coordinating described PWM to produce the FB end of circuit 204, regulating when not increasing power; The FB end also having the adjustment of a kind of method to feed back to described PWM generation circuit 204 is the resistance value by regulating described 4th resistance 402, increase resistance value and certainly will increase system power, obvious this method is not more economized by the method power of the ratio regulating described 6th resistance 407 and described 7th resistance 408.
Described sampling feedback circuit 400 is voltage signals by responding to described transformer primary side 206 and is converted to feedback voltage, described transformer primary side 206 be with flow through real-time driving LED current signal be coupling, described 3rd resistance 401 and described 4th resistance 402 form bleeder circuit and carry out dividing potential drop to the voltage on described transformer primary side 206, waveform is consistent with the waveform on described transformer primary side 206, then the low pass filter consisted of described 5th resistance 403 and described 5th electric capacity 404 is left low-frequency d voltage again by described first operational amplifier 406, described 6th resistance 407 and described 7th resistance 408 form amplifying circuit and amplify the FB end that direct voltage feeds back to described PWM generation circuit 204, voltage on described 4th resistance 402 is proportional with the electric current of driving LED, make to feed back to described PWM and produce the voltage of the FB end of circuit 204 to be equipped with, the direct voltage of this setting changes along with the change exporting driving LED electric current, described PWM produces circuit 204 and exports corresponding duty ratio according to the height of feedback voltage, like this with regard to the driving LED electric current of stable output.
Claims (1)
1. transformer primary side sampling LED control system, comprise rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and sampling feedback circuit, it is characterized in that described sampling feedback circuit draws together the 3rd resistance, the 4th resistance, the 5th resistance, the 5th electric capacity, the first voltage-stabiliser tube, the first operational amplifier, the 6th resistance and the 7th resistance:
One end of termination first electric capacity of described 3rd resistance and one end of the N pole of the second diode and the N pole of the 4th diode and one end of the first resistance and the 3rd electric capacity and one end of the second resistance and one end of transformer primary side, one end of the 4th resistance described in another termination and one end of described 5th resistance;
One end of 3rd resistance described in one termination of described 4th resistance and one end of described 5th resistance, other end ground connection;
One end of 3rd resistance described in one termination of described 5th resistance and one end of described 4th resistance, the positive input terminal of one end of the 5th electric capacity described in another termination and the N pole of described first voltage-stabiliser tube and described first operational amplifier;
The positive input terminal of one end of the 5th resistance and the N pole of described first voltage-stabiliser tube and described first operational amplifier described in one termination of described 5th electric capacity, other end ground connection;
The P pole ground connection of described first voltage-stabiliser tube, N pole connects one end of described 5th electric capacity and one end of described 5th resistance and the positive input terminal of described first operational amplifier;
One end of 5th electric capacity described in the positive input termination of described first operational amplifier and one end of described 5th resistance and the N pole of described first voltage-stabiliser tube, one end of 6th resistance described in negative input termination and one end of described 7th resistance, export termination PWM and produce the FB end of circuit and one end of described 6th resistance;
The output of the first operational amplifier described in one termination of described 6th resistance and PWM produce the FB end of circuit, one end of the 7th resistance described in another termination and the negative input end of described first operational amplifier;
One end of 6th resistance described in one termination of described 7th resistance and the negative input end of described first operational amplifier, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042060.XU CN204465942U (en) | 2015-01-20 | 2015-01-20 | Transformer primary side sampling LED control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042060.XU CN204465942U (en) | 2015-01-20 | 2015-01-20 | Transformer primary side sampling LED control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204465942U true CN204465942U (en) | 2015-07-08 |
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ID=53672759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520042060.XU Expired - Fee Related CN204465942U (en) | 2015-01-20 | 2015-01-20 | Transformer primary side sampling LED control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204465942U (en) |
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2015
- 2015-01-20 CN CN201520042060.XU patent/CN204465942U/en not_active Expired - Fee Related
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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: 20150708 Termination date: 20160120 |
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| EXPY | Termination of patent right or utility model |