CN204425197U - For the electromagnetic interference denoising device of former limit sampling LED control system - Google Patents
For the electromagnetic interference denoising device of former limit sampling LED control system Download PDFInfo
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- CN204425197U CN204425197U CN201520042078.XU CN201520042078U CN204425197U CN 204425197 U CN204425197 U CN 204425197U CN 201520042078 U CN201520042078 U CN 201520042078U CN 204425197 U CN204425197 U CN 204425197U
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Abstract
The utility model discloses a kind of electromagnetic interference denoising device for former limit sampling LED control system.Former limit sampling LED control system comprises rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and electromagnetic interference Dolby circuit.Described electromagnetic interference Dolby circuit comprises the 5th electric capacity, the first inductance, the 6th electric capacity and the second inductance.The electromagnetic interference denoising device utilizing the utility model to provide can reduce the electromagnetic interference in LED control system.
Description
Technical field
The utility model relates to electromagnetic interference technology, refers more particularly to the electromagnetic interference Dolby circuit for former limit sampling LED control system.
Background technology
In switching power circuit topological structure, the primary of half-bridge driven Switching Power Supply all flows through electric current in the whole cycle, the power switch pipe requirement of withstand voltage used is lower, and the saturation voltage drop of switching tube reduces to minimum, uses voltage request also very low to input filter capacitor.LED control system designs based on switching power circuit, simultaneously in LED control system circuit, the monitoring of LED current is the very important part of circuit design, electric current is crossed conference and LED is burnt out, and the too small meeting of electric current makes LED luminance inadequate, and in LED control system, electromagnetic interference can not be ignored simultaneously.
Summary of the invention
The utility model is intended to solve the deficiencies in the prior art, provides a kind of electromagnetic interference denoising device for former limit sampling LED control system that can reduce electromagnetic interference.
Former limit sampling LED control system, comprises rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and electromagnetic interference Dolby circuit:
Described rectification circuit be connected to power circuit input for receiving ac input voltage;
Rectification circuit described in described switch type power supply converter circuit changes the input voltage after rectification, generate to respond the input voltage after rectification the output voltage regulated, by transformer primary side LED current sampled out and feed back to described switch type power supply converter circuit to change pwm signal and then to regulate described half-bridge driven output circuit to export the electric current of driving;
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 electromagnetic interference Dolby circuit is that the electromagnetic interference signal in system is reduced.
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;
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.
Described switch type power supply converter circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first resistance, the second resistance, the 5th diode, transformer primary side one, transformer primary side two, PWM generation circuit and power NMOS tube:
One end of the N pole of the second diode described in one termination of described first electric capacity, the N pole of described 4th diode, one end of described first resistance, described one end of 3rd electric capacity, one end of the second resistance and described transformer primary side, other end ground connection;
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;
One end of one end of the N pole of the second diode described in one termination of described 3rd electric capacity, the N pole of described 4th diode, described first electric capacity, one end of described first resistance, one end of the second resistance and described transformer primary side, the other end of the second resistance described in another termination and the N pole of described 5th diode;
One end of the N pole of the second diode described in one termination of described first resistance, the N pole of described 4th diode, one end of described first electric capacity, described 3rd electric capacity, one end of described second resistance and one end of described transformer primary side, the power supply VCC that one end of the second electric capacity described in another termination and described PWM produce circuit holds;
The one termination other end of described second resistance connects one end of described 3rd electric capacity and the N pole of described 5th diode;
The P pole of described 5th diode connects the other end of described transformer primary side one 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;
One end of the N pole of the second diode described in one termination of described transformer primary side one, the N pole of described 4th diode, one end of described first electric capacity, one end of described first resistance, one end of described second resistance and described 3rd electric capacity;
One end of transformer primary side one described in one termination of described transformer primary side two and the P pole of described 5th diode and the drain electrode of described power NMOS tube, PWM described in another termination produces the FB end of circuit;
It is produce pwm signal driving power NMOS tube that described PWM produces circuit, sampling feedback circuit described in the feedback FB termination of described PWM generation circuit;
The grid of described power NMOS tube meets described PWM and 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 time limit, the 6th diode, the 4th electric capacity, a LED, the 2nd LED and the 3rd resistance:
The P pole of the 6th diode described in one termination on described transformer time limit, other end ground connection;
The P pole of described 6th diode connects the one end on described transformer time limit, and N pole connects one end of the 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;
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 one end of described 3rd resistance;
The N pole of the 3rd LED described in one termination of described 3rd resistance, other end ground connection.
Described electromagnetic interference Dolby circuit comprises the 5th electric capacity, the first inductance, the 6th electric capacity and the second inductance:
One end of first inductance described in one termination of described 5th electric capacity and the N pole of described first diode and the P pole of described second diode and one end of ac input voltage, other end ground connection;
One end of 5th electric capacity described in one termination of described first inductance and the N pole of described first diode and the P pole of described second diode and one end of ac input voltage, other end ground connection;
One end of second inductance described in one termination of described 6th electric capacity and the N pole of described 3rd diode and the described P pole of the 4th diode and the other end of ac input voltage, other end ground connection;
One end of 6th electric capacity described in one termination of described second inductance and the N pole of described 3rd diode and the described P pole of the 4th diode and the other end of ac input voltage, other end ground connection.
When ac input voltage is in positive half cycle, AC communication channel is described second diode, described first electric capacity, described 3rd diode, because described 5th electric capacity has logical AC characteristic, the other end of AC AC power by described 5th electric capacity to ground, be equivalent to by described 5th capacitance short-circuit to ground, the impact that system common-mode noise produces with regard to filtering like this; When high frequency, the capacitive reactance of described 5th electric capacity is very little, the induction reactance short circuit of described first inductance; When low frequency, the capacitive reactance of described 5th electric capacity is very large, has low-frequency current by described first inductance, forms path; When ac input voltage is in negative half period, AC communication channel is described 4th diode, described first electric capacity, described first diode, because described 6th electric capacity has logical AC characteristic, the other end of AC AC power by described 6th electric capacity to ground, be equivalent to by described 6th capacitance short-circuit to ground, the impact that system common-mode noise produces with regard to filtering like this; When high frequency, the capacitive reactance of described 6th electric capacity is very little, the induction reactance short circuit of described second inductance; When low frequency, the capacitive reactance of described 6th electric capacity is very large, has low-frequency current by described second inductance, forms path.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of former limit sampling LED control system of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
Former limit 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 electromagnetic interference Dolby circuit 400:
Described rectification circuit 100 be connected to power circuit input for receiving ac input voltage;
Rectification circuit 100 described in described switch type power supply converter circuit 200 changes the input voltage after rectification, generate to respond the input voltage after rectification the output voltage regulated, by transformer primary side LED current sampled out and feed back to described switch type power supply converter circuit 200 to change pwm signal and then to regulate described half-bridge driven output circuit 300 to export the electric current of driving;
Described half-bridge driven output circuit 300 is that the voltage half bridge output filtering that described switch type power supply converter circuit exports is obtained direct voltage drive LED;
Described electromagnetic interference Dolby circuit 400 is that the electromagnetic interference signal in system is reduced.
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;
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.
Described switch type power supply converter circuit 200 comprises the first electric capacity 201, second electric capacity 203, the 3rd electric capacity 207, first resistance 202, second resistance 208, the 5th diode 209, transformer primary side 1, transformer primary side 2 210, 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, the N pole of described 4th diode 104, one end of described first resistance 202, described 3rd electric capacity 207, one end of the second resistance 208 and one end of described transformer primary side 206, other end ground connection;
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;
One end of the N pole of the second diode 102 described in one termination of described 3rd electric capacity 207, the N pole of described 4th diode 104, one end of described first electric capacity 201, described first resistance 202, one end of the second resistance 208 and one end of described transformer primary side 206, the other end of the second resistance 208 described in another termination and the N pole of described 5th diode 209;
The N pole of the second diode 102 described in one termination of described first resistance 202, the N pole of described 4th diode 104, one end of described first electric capacity 201, one end of described 3rd electric capacity 207, described one end of second resistance 208 and one end of described transformer primary side 206, 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 one termination other end of described second resistance 208 connects one end of described 3rd electric capacity 207 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 1 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;
One end of the N pole of the second diode 102 described in one termination of described transformer primary side 1, the N pole of described 4th diode 104, one end of described first electric capacity 201, one end of described first resistance 202, one end of described second resistance 208 and described 3rd electric capacity 207;
One end of transformer primary side 1 described in one termination of described transformer primary side 2 210 and the P pole of described 5th diode 209 and the drain electrode of described power NMOS tube 205, PWM described in another termination produces the FB end of circuit 204;
It is produce pwm signal driving power NMOS tube 205 that described PWM produces circuit 204, sampling feedback circuit 400 described in the feedback FB termination of described PWM generation circuit 204;
The grid of described power NMOS tube 205 meets described PWM and 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 time limit 301, the 6th diode 302, the 4th electric capacity 303, a LED304, the 2nd LED305 and the 3rd resistance 306:
The P pole of the 6th diode 302 described in one termination on described transformer time limit 301, other end ground connection;
The P pole of described 6th diode 302 connects the one end on described transformer time limit 301, and N pole connects one end of the 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;
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 one end of described 3rd resistance 306;
The N pole of the 3rd LED305 described in one termination of described 3rd resistance 306, other end ground connection.
Described electromagnetic interference Dolby circuit 400 comprises the 5th electric capacity 401, first inductance 402, the 6th electric capacity 403 and the second inductance 404:
One end of first inductance 402 described in one termination of described 5th electric capacity 401 and the N pole of described first diode 101 and the described P pole of the second diode 102 and one end of ac input voltage, other end ground connection;
One end of 5th electric capacity 401 described in one termination of described first inductance 402 and the N pole of described first diode 101 and the described P pole of the second diode 102 and one end of ac input voltage, other end ground connection;
One end of second inductance 404 described in one termination of described 6th electric capacity 403 and the N pole of described 3rd diode 103 and the described P pole of the 4th diode 104 and the other end of ac input voltage, other end ground connection;
One end of 6th electric capacity 403 described in one termination of described second inductance 404 and the N pole of described 3rd diode 103 and the described P pole of the 4th diode 104 and the other end of ac input voltage, other end ground connection.
When ac input voltage is in positive half cycle, AC communication channel is described second diode 102, described first electric capacity 201, described 3rd diode 103, because described 5th electric capacity 401 has logical AC characteristic, the other end of AC AC power arrives ground by described 5th electric capacity 401, be equivalent to be shorted to ground by described 5th electric capacity 401, the impact that system common-mode noise produces with regard to filtering like this; When high frequency, the capacitive reactance of described 5th electric capacity 401 is very little, the induction reactance short circuit of described first inductance 402; When low frequency, the capacitive reactance of described 5th electric capacity 401 is very large, has low-frequency current by described first inductance 402, forms path; When ac input voltage is in negative half period, AC communication channel is described 4th diode 104, described first electric capacity 201, described first diode 101, because described 6th electric capacity 403 has logical AC characteristic, the other end of AC AC power arrives ground by described 6th electric capacity 403, be equivalent to be shorted to ground by described 6th electric capacity 403, the impact that system common-mode noise produces with regard to filtering like this; When high frequency, the capacitive reactance of described 6th electric capacity 403 is very little, the induction reactance short circuit of described second inductance 404; When low frequency, the capacitive reactance of described 6th electric capacity 403 is very large, has low-frequency current by described second inductance 404, forms path.
Claims (1)
1., for the electromagnetic interference denoising device of former limit sampling LED control system, it is characterized in that, comprise the 5th electric capacity, the first inductance, the 6th electric capacity and the second inductance:
One end of first inductance described in one termination of described 5th electric capacity and the P pole of the N pole of the first diode and the second diode and one end of ac input voltage, other end ground connection;
The P pole of one end of the 5th electric capacity and the N pole of the first diode and the second diode described in one termination of described first inductance and one end of ac input voltage, other end ground connection;
One end of second inductance described in one termination of described 6th electric capacity and the N pole of the 3rd diode and the P pole of the 4th diode and the other end of ac input voltage, other end ground connection;
One end of 6th electric capacity described in one termination of described second inductance and the N pole of described 3rd diode and the described P pole of the 4th diode and the other end of ac input voltage, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042078.XU CN204425197U (en) | 2015-01-20 | 2015-01-20 | For the electromagnetic interference denoising device of former limit sampling LED control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042078.XU CN204425197U (en) | 2015-01-20 | 2015-01-20 | For the electromagnetic interference denoising device of former limit sampling LED control system |
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| Publication Number | Publication Date |
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| CN204425197U true CN204425197U (en) | 2015-06-24 |
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|---|---|---|---|
| CN201520042078.XU Expired - Fee Related CN204425197U (en) | 2015-01-20 | 2015-01-20 | For the electromagnetic interference denoising device of former limit sampling LED control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306636A (en) * | 2015-10-30 | 2016-02-03 | 努比亚技术有限公司 | Method, circuit and system for improving power supply noise |
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2015
- 2015-01-20 CN CN201520042078.XU patent/CN204425197U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306636A (en) * | 2015-10-30 | 2016-02-03 | 努比亚技术有限公司 | Method, circuit and system for improving power supply noise |
| CN105306636B (en) * | 2015-10-30 | 2020-09-29 | 南京鼎臻自动化科技有限公司 | Method, circuit and system for improving power supply noise |
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| 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: 20150624 Termination date: 20160120 |
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| EXPY | Termination of patent right or utility model |