CN203120255U - LED control system circuit for primary-side sampling - Google Patents
LED control system circuit for primary-side sampling Download PDFInfo
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- CN203120255U CN203120255U CN 201320128991 CN201320128991U CN203120255U CN 203120255 U CN203120255 U CN 203120255U CN 201320128991 CN201320128991 CN 201320128991 CN 201320128991 U CN201320128991 U CN 201320128991U CN 203120255 U CN203120255 U CN 203120255U
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- 238000001914 filtration Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 1
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Abstract
The utility model discloses an LED control system for primary-side sampling. The LED control system for primary-side sampling comprises a rectifying circuit, a switch power converter circuit, a half-bridge driving output circuit and a primary-side sampling feedback circuit. The rectifying circuit is connected with an input end of a power circuit and used for receiving AC (alternating current) input voltage. The switch power converter circuit receives input voltage rectified by the rectifying circuit so as to respond to rectified input voltage to generate adjustable output voltage. The half-bridge driving output circuit outputs and filters output voltage of the switch power converter circuit in a half bridge to obtain direct-current voltage drive LEDs. The primary-side sampling feedback circuit samples LED current and feeds back to the switch power converter circuit through a primary side of a transformer so as to change PWM (pulse width modulation) signals to adjust drive current outputted by the half-bridge driving output circuit. By the LED control system for primary-side sampling, primary-side sampling of LED current can be realized in real time and LED current is adjusted.
Description
Technical field
The utility model relates to switching power circuit, refers more particularly to the LED control system circuit of former sampling edge.
Background technology
In the switching power circuit topological structure, the primary of half-bridge driven Switching Power Supply all flows through electric current in the whole cycle, employed power switch pipe requirement of withstand voltage is lower, and it is minimum that the saturation voltage drop of switching tube reduces to, and uses voltage request also very low to input filter capacitor.The LED control system is based on the switching power circuit design, and the monitoring of LED electric current is the very important part of circuit design in LED control system circuit simultaneously, and electric current is crossed conference LED is burnt out, and the too small meeting of electric current makes LED brightness not enough.
Summary of the invention
The utility model is intended to solve the deficiencies in the prior art, and a kind of LED control system circuit that can former sampling edge LED electric current is provided.
The LED control system circuit of former sampling edge comprises rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and former sampling edge feedback circuit:
Described rectification circuit is that the input that is connected to power circuit is used for receiving ac input voltage;
The described rectification circuit of described switch type power supply converter circuit changes the input voltage after the rectification, generates the output voltage of regulating with the input voltage after the response rectification;
Described half-bridge driven output circuit is that the voltage half-bridge output filtering of described switch type power supply converter circuit output is obtained direct voltage drive LED;
Described former sampling edge feedback circuit is the LED current sample is come out and to feed back to described switch type power supply converter circuit to change pwm signal and then to regulate the electric current that described half-bridge driven output circuit output drives by the former limit of transformer.
Described rectification circuit comprises first diode, second diode, the 3rd diode and the 4th diode:
The P utmost point ground connection of described first diode, the N utmost point connect an end of ac input voltage and the P utmost point of described second diode;
The P utmost point of described second diode connects an end of ac input voltage and the N utmost point of described first diode, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit of described the 4th diode;
The P utmost point ground connection of described the 3rd diode, the N utmost point connect the other end of ac input voltage and the P utmost point of described the 4th diode;
The P utmost point of described the 4th diode connects the other end of ac input voltage and the N utmost point of described the 3rd diode, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit of described second diode.
Described switch type power supply converter circuit comprises that first electric capacity, second electric capacity, the 3rd electric capacity, first resistance, second resistance, the 5th diode, the former limit of transformer, PWM produce circuit and power NMOS pipe:
One end on one end of the N utmost point of described second diode of one termination of described first electric capacity, the N utmost point of described the 4th diode, an end of described first resistance, described the 3rd electric capacity, an end of second resistance and the former limit of described transformer, other end ground connection;
One end of described first resistance of one termination of described second electric capacity and described PWM produce the power supply VCC end of circuit, other end ground connection;
One end on one end of the N utmost point of described second diode of one termination of described the 3rd electric capacity, the N utmost point of described the 4th diode, an end of described first electric capacity, described first resistance, an end of second resistance and the former limit of described transformer, the other end of described second resistance of another termination and the N utmost point of described the 5th diode;
One end of the N utmost point of described second diode of one termination of described first resistance, the N utmost point of described the 4th diode, an end of described first electric capacity, an end of described the 3rd electric capacity, described second resistance and an end on the former limit of described transformer, an end of described second electric capacity of another termination and described PWM produce the power supply VCC end of circuit;
One end of described the 3rd electric capacity of another termination of one termination of described second resistance and the N utmost point of described the 5th diode;
The P utmost point of described the 5th diode connects the drain electrode of the other end and the described power NMOS pipe on the former limit of described transformer, and the N utmost point connects an end of described the 3rd electric capacity and an end of described second resistance;
One end of the N utmost point of described second diode of one termination on the former limit of described transformer, the N utmost point of described the 4th diode, an end of described first electric capacity, an end of described first resistance, described second resistance and an end of described the 3rd electric capacity;
It is to produce pwm signal driving power NMOS pipe that described PWM produces circuit, and described PWM produces the described sampling feedback circuit of feedback termination of circuit;
The grid of described power NMOS pipe meets described PWM and produces circuit, and drain electrode connects the P utmost point of described the 5th diode and an end on the former limit of described transformer, 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 utmost point of described the 6th diode of one termination on described transformer time limit, other end ground connection;
The P utmost point of described the 6th diode connects an end on described transformer time limit, and the N utmost point connects an end of the 4th electric capacity and the P utmost point of a described LED;
The N utmost point of described the 6th diode of one termination of described the 4th electric capacity and the P utmost point of a described LED;
The P utmost point of a described LED connects the N utmost point of described the 6th diode and an end of described the 4th electric capacity, and the N utmost point connects the P utmost point of described the 2nd LED;
The P utmost point of described the 2nd LED connects the N utmost point of a described LED, and the N utmost point connects an end of described the 3rd resistance;
The N utmost point of described the 3rd LED of one termination of described the 3rd resistance, other end ground connection.
Described former sampling edge feedback circuit comprises the former limit of transformer:
[0069] the P utmost point of an end on the former limit of the described transformer of a termination on the former limit of described transformer and described the 5th diode and the drain electrode of described power NMOS pipe, the described PWM of another termination produces the FB end of circuit.
Utilize the LED control system circuit of the former sampling edge that the utility model provides can real-time former sampling edge LED electric current and regulate the LED electric current.
Description of drawings
Fig. 1 is the circuit diagram of the LED control system circuit of former sampling edge of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model content is further specified.
The LED control system circuit of former sampling edge as shown in Figure 1, comprises rectification circuit 100, switch type power supply converter circuit 200, half-bridge driven output circuit 300 and former sampling edge feedback circuit:
Described rectification circuit 100 is that the input that is connected to power circuit is used for receiving ac input voltage;
Described switch type power supply converter circuit 200 described rectification circuits 100 change the input voltage after the rectification, generate the output voltage of regulating with the input voltage after the response rectification;
Described half-bridge driven output circuit 300 is that the voltage half-bridge output filtering of described switch type power supply converter circuit output is obtained direct voltage drive LED;
Described former sampling edge feedback circuit is the LED current sample is come out and to feed back to described switch type power supply converter circuit 200 to change pwm signal and then to regulate the electric current that described half-bridge driven output circuit 300 outputs drive by the former limit of transformer.
Described rectification circuit 100 comprises first diode 101, second diode 102, the 3rd diode 103 and the 4th diode 104:
The P utmost point ground connection of described first diode 101, the N utmost point connect an end of ac input voltage and the P utmost point of described second diode 102;
The P utmost point of described second diode 102 connects an end of ac input voltage and the N utmost point of described first diode 101, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit 200 of described the 4th diode 104;
The P utmost point ground connection of described the 3rd diode 103, the N utmost point connect the other end of ac input voltage and the P utmost point of described the 4th diode 104;
The P utmost point of described the 4th diode 104 connects the other end of ac input voltage and the N utmost point of described the 3rd diode 103, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit 200 of described second diode 102.
Described switch type power supply converter circuit 200 comprises that first electric capacity 201, second electric capacity 203, the 3rd electric capacity 207, first resistance 202, second resistance 208, the 5th diode 209, the former limit 206 of transformer, PWM produce circuit 204 and power NMOS pipe 205:
One end of the N utmost point of described second diode 102 of one termination of described first electric capacity 201, the N utmost point of described the 4th diode 104, an end of described first resistance 202, described the 3rd electric capacity 207, an end of second resistance 208 and an end on the former limit 206 of described transformer, other end ground connection;
One end of described first resistance 202 of one termination of described second electric capacity 203 and described PWM produce the power supply VCC end of circuit 204, other end ground connection;
One end of the N utmost point of described second diode 102 of one termination of described the 3rd electric capacity 207, the N utmost point of described the 4th diode 104, an end of described first electric capacity 201, described first resistance 202, an end of second resistance 208 and an end on the former limit 206 of described transformer, the N utmost point of the other end of described second resistance 208 of another termination and described the 5th diode 209;
One end of the N utmost point of described second diode 102 of one termination of described first resistance 202, the N utmost point of described the 4th diode 104, an end of described first electric capacity 201, an end of described the 3rd electric capacity 207, described second resistance 208 and an end on the former limit 206 of described transformer, an end of described second electric capacity 203 of another termination and described PWM produce the power supply VCC end of circuit 204;
One end of described the 3rd electric capacity 207 of another termination of one termination of described second resistance 208 and the N utmost point of described the 5th diode 209;
The P utmost point of described the 5th diode 209 connects the drain electrode of the other end and the described power NMOS pipe 205 on the former limit of described transformer, and the N utmost point connects an end of described the 3rd electric capacity 207 and an end of described second resistance 208;
One end of the N utmost point of described second diode 102 of one termination on the former limit 206 of described transformer, the N utmost point of described the 4th diode 104, an end of described first electric capacity 201, an end of described first resistance 202, described second resistance 208 and an end of described the 3rd electric capacity 207;
It is to produce pwm signal driving power NMOS pipe 205 that described PWM produces circuit 204, and described PWM produces the described sampling feedback circuit 400 of feedback FB termination of circuit 204;
The grid of described power NMOS pipe 205 meets described PWM and produces circuit 204, and drain electrode connects the P utmost point of described the 5th diode 209 and an end on the former limit 206 of described transformer, 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 utmost point of described the 6th diode 302 of one termination on described transformer time limit 301, other end ground connection;
The P utmost point of described the 6th diode 302 connects an end on described transformer time limit 301, and the N utmost point connects an end of the 4th electric capacity 303 and the P utmost point of a described LED304;
The N utmost point of described the 6th diode 302 of one termination of described the 4th electric capacity 303 and the P utmost point of a described LED304;
The P utmost point of a described LED304 connects the N utmost point of described the 6th diode 302 and an end of described the 4th electric capacity, and the N utmost point connects the P utmost point of described the 2nd LED305;
The P utmost point of described the 2nd LED305 connects the N utmost point of a described LED304, and the N utmost point connects an end of described the 3rd resistance 306;
The N utmost point of described the 3rd LED305 of one termination of described the 3rd resistance 306, other end ground connection.
Described former sampling edge feedback circuit comprises the former limit 210 of transformer:
[0069] drain electrode of the P utmost point of an end on the former limit 206 of the described transformer of a termination on the former limit 210 of described transformer and described the 5th diode 209 and described power NMOS pipe 205, the described PWM of another termination produces the FB end of circuit 204.
The utility model discloses a kind of LED control system circuit of former sampling edge, and describe embodiment of the present utility model and effect with reference to the accompanying drawings.What should be understood that is: above-described embodiment is just to explanation of the present utility model, rather than to restriction of the present utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the utility model protection range.
Claims (5)
1. the LED control system circuit of former sampling edge is characterized in that comprising rectification circuit, switch type power supply converter circuit, half-bridge driven output circuit and former sampling edge feedback circuit:
Described rectification circuit is that the input that is connected to power circuit is used for receiving ac input voltage;
The described rectification circuit of described switch type power supply converter circuit changes the input voltage after the rectification, generates the output voltage of regulating with the input voltage after the response rectification;
Described half-bridge driven output circuit is that the voltage half-bridge output filtering of described switch type power supply converter circuit output is obtained direct voltage drive LED;
Described former sampling edge feedback circuit is the LED current sample is come out and to feed back to described switch type power supply converter circuit to change pwm signal and then to regulate the electric current that described half-bridge driven output circuit output drives by the former limit of transformer.
2. the LED control system circuit of former sampling edge as claimed in claim 1 is characterized in that described rectification circuit comprises first diode, second diode, the 3rd diode and the 4th diode:
The P utmost point ground connection of described first diode, the N utmost point connect an end of ac input voltage and the P utmost point of described second diode;
The P utmost point of described second diode connects an end of ac input voltage and the N utmost point of described first diode, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit of described the 4th diode;
The P utmost point ground connection of described the 3rd diode, the N utmost point connect the other end of ac input voltage and the P utmost point of described the 4th diode;
The P utmost point of described the 4th diode connects the other end of ac input voltage and the N utmost point of described the 3rd diode, and the N utmost point connects the N utmost point and the described switch type power supply converter circuit of described second diode.
3. the LED control system circuit of former sampling edge as claimed in claim 1 is characterized in that described switch type power supply converter circuit comprises that first electric capacity, second electric capacity, the 3rd electric capacity, first resistance, second resistance, the 5th diode, the former limit of transformer, PWM produce circuit and power NMOS pipe:
One end on one end of the N utmost point of described second diode of one termination of described first electric capacity, the N utmost point of described the 4th diode, an end of described first resistance, described the 3rd electric capacity, an end of second resistance and the former limit of described transformer, other end ground connection;
One end of described first resistance of one termination of described second electric capacity and described PWM produce the power supply VCC end of circuit, other end ground connection;
One end on one end of the N utmost point of described second diode of one termination of described the 3rd electric capacity, the N utmost point of described the 4th diode, an end of described first electric capacity, described first resistance, an end of second resistance and the former limit of described transformer, the other end of described second resistance of another termination and the N utmost point of described the 5th diode;
One end of the N utmost point of described second diode of one termination of described first resistance, the N utmost point of described the 4th diode, an end of described first electric capacity, an end of described the 3rd electric capacity, described second resistance and an end on the former limit of described transformer, an end of described second electric capacity of another termination and described PWM produce the power supply VCC end of circuit;
One end of described the 3rd electric capacity of another termination of one termination of described second resistance and the N utmost point of described the 5th diode;
The P utmost point of described the 5th diode connects the drain electrode of the other end and the described power NMOS pipe on the former limit of described transformer, and the N utmost point connects an end of described the 3rd electric capacity and an end of described second resistance;
One end of the N utmost point of described second diode of one termination on the former limit of described transformer, the N utmost point of described the 4th diode, an end of described first electric capacity, an end of described first resistance, described second resistance and an end of described the 3rd electric capacity;
It is to produce pwm signal driving power NMOS pipe that described PWM produces circuit, and described PWM produces the described sampling feedback circuit of feedback termination of circuit;
The grid of described power NMOS pipe meets described PWM and produces circuit, and drain electrode connects the P utmost point of described the 5th diode and an end on the former limit of described transformer, source ground.
4. the LED control system circuit of former sampling edge as claimed in claim 1 is characterized in that 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 utmost point of described the 6th diode of one termination on described transformer time limit, other end ground connection;
The P utmost point of described the 6th diode connects an end on described transformer time limit, and the N utmost point connects an end of the 4th electric capacity and the P utmost point of a described LED;
The N utmost point of described the 6th diode of one termination of described the 4th electric capacity and the P utmost point of a described LED;
The P utmost point of a described LED connects the N utmost point of described the 6th diode and an end of described the 4th electric capacity, and the N utmost point connects the P utmost point of described the 2nd LED;
The P utmost point of described the 2nd LED connects the N utmost point of a described LED, and the N utmost point connects an end of described the 3rd resistance;
The N utmost point of described the 3rd LED of one termination of described the 3rd resistance, other end ground connection.
5. the LED control system circuit of former sampling edge as claimed in claim 1 is characterized in that described former sampling edge feedback circuit comprises the former limit of transformer:
One end on the former limit of the described transformer of one termination on the former limit of described transformer and the P utmost point of described the 5th diode and the drain electrode of described power NMOS pipe, the described PWM of another termination produces the FB end of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320128991 CN203120255U (en) | 2013-03-18 | 2013-03-18 | LED control system circuit for primary-side sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320128991 CN203120255U (en) | 2013-03-18 | 2013-03-18 | LED control system circuit for primary-side sampling |
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| Publication Number | Publication Date |
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| CN203120255U true CN203120255U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320128991 Expired - Fee Related CN203120255U (en) | 2013-03-18 | 2013-03-18 | LED control system circuit for primary-side sampling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103547041A (en) * | 2013-10-30 | 2014-01-29 | 辉芒微电子（深圳）有限公司 | LED driver circuit |
| CN104968097A (en) * | 2014-11-22 | 2015-10-07 | 成都威邦科技有限公司 | Non-linear drain electrode driving system for blue LED lamp based on boost voltage stabilizing circuit |
| CN106507549A (en) * | 2016-12-29 | 2017-03-15 | 重庆奥海辉龙大数据有限公司 | LED drive power and system |
-
2013
- 2013-03-18 CN CN 201320128991 patent/CN203120255U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103547041A (en) * | 2013-10-30 | 2014-01-29 | 辉芒微电子（深圳）有限公司 | LED driver circuit |
| CN103547041B (en) * | 2013-10-30 | 2015-10-28 | 辉芒微电子（深圳）有限公司 | Led drive circuit |
| CN104968097A (en) * | 2014-11-22 | 2015-10-07 | 成都威邦科技有限公司 | Non-linear drain electrode driving system for blue LED lamp based on boost voltage stabilizing circuit |
| CN106507549A (en) * | 2016-12-29 | 2017-03-15 | 重庆奥海辉龙大数据有限公司 | LED drive power and system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20140318 |