CN101938873A - Led control circuit - Google Patents
Led control circuit Download PDFInfo
- Publication number
- CN101938873A CN101938873A CN2010102790317A CN201010279031A CN101938873A CN 101938873 A CN101938873 A CN 101938873A CN 2010102790317 A CN2010102790317 A CN 2010102790317A CN 201010279031 A CN201010279031 A CN 201010279031A CN 101938873 A CN101938873 A CN 101938873A
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- circuit
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- suppresses
- pwm
- control circuit
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention discloses an LED control circuit comprising an EMI (Electro-Magnetic Interference) suppression circuit, a rectification circuit, a power factor correcting circuit, a PWM (Pulse-Width Modulation) control circuit, a rectification filter circuit and a starting suppression circuit, wherein the output end of the EMI suppression circuit is connected with the input end of the rectification circuit; the output end of the rectification circuit is connected in series with the power factor correcting circuit and then connected with the input end of the starting suppression circuit; the output end of the PWM control circuit is connected with the control end of the starting suppression circuit; and the output end of the starting suppression circuit is connected with the input end of the rectification filter circuit. The LED control circuit can enhance the working voltage of a drive circuit by adopting PWM control, reduce the drive current and decrease the line loss caused by large current driving and the burden of a driving power supply.
Description
Technical field
The invention belongs to a kind of LED control circuit, belong to the technical field of LED PWM control.
Background technology
Light-emitting diode (LED) has advantages such as high brightness shows, response speed is fast, this makes it occupy indispensable one seat in large scale, indoor and outdoor lighting field, but because the problem of manufacturing process, inconsistency between the LED unit is more serious, in order to solve inconsistent problem, must carry out independent control to each LED unit, and proofread and correct, drive the cost height; Because LED is low-voltage, high-current device, and electric current is to the power requirement height greatly, and circuit loss is big.
Summary of the invention
The present invention seeks to provides a kind of LED control circuit at the defective that prior art exists.
The present invention adopts following technical scheme for achieving the above object:
LED control circuit of the present invention, comprise that EMI suppresses circuit, rectification circuit, power factor correction circuit, pwm control circuit, current rectifying and wave filtering circuit and startup and suppresses circuit, wherein EMI suppresses the input of the output termination rectification circuit of circuit, connect behind the output serial connection power factor correction circuit of rectification circuit and start the input that suppresses circuit, the output termination of pwm control circuit starts the control end that suppresses circuit, starts the input of the output termination current rectifying and wave filtering circuit that suppresses circuit.
Preferably, described pwm control circuit comprises pwm chip, power switch pipe and four resistance, the grid of the OUT termination power switch pipe of pwm chip wherein, the VCC end of pwm chip and the drain electrode of power switch pipe connect respectively to start and suppress circuit, the CS end of pwm chip connects an end of the 7th resistance respectively and starts and suppresses circuit, the FB end of pwm chip connects an end of the 11 resistance respectively and starts and suppresses circuit, the source electrode of power switch pipe connects the other end of the 7th resistance respectively, one end of the 12 resistance and an end of the 13 resistance, the GND end of pwm chip connect the other end of the 11 to 13 resistance respectively and start and suppress circuit.
Control circuit of the present invention adopts the operating voltage of PWM control can raising drive circuit, reduces drive current, reduces because the line loss that big current drives causes and to the burden of driving power.
Description of drawings
Fig. 1: circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, LED control circuit of the present invention, it is characterized in that comprising that EMI suppresses circuit 1, rectification circuit 2, power factor correction circuit 3, pwm control circuit 4, current rectifying and wave filtering circuit 5 and start to suppress circuit 6, wherein EMI suppresses the input of the output termination rectification circuit 2 of circuit 1, connect behind the output serial connection power factor correction circuit 3 of rectification circuit 2 and start the input that suppresses circuit 6, the output termination of pwm control circuit 4 starts the control end that suppresses circuit 6, starts the input of the output termination current rectifying and wave filtering circuit 5 that suppresses circuit 6.
Described pwm control circuit 4 comprises pwm chip U1, power switch pipe Q1 and four resistance R 7, R11, R12, R13, the grid of the OUT termination power switch pipe Q1 of pwm chip U1 wherein, the VCC end of pwm chip U1 and the drain electrode of power switch pipe Q1 connect respectively to start and suppress circuit 6, the CS end of pwm chip U1 connects an end of the 7th resistance R 7 respectively and starts and suppresses circuit 6, the FB end of pwm chip U1 connects an end of the 11 resistance R 11 respectively and starts and suppresses circuit 6, the source electrode of power switch pipe Q1 connects the other end of the 7th resistance R 7 respectively, one end of the 12 resistance R 12 and an end of the 13 resistance R 13, the GND end of pwm chip U1 connect the other end of the 11 to 13 resistance R 11～R13 respectively and start and suppress circuit 6.
Claims (2)
1. LED control circuit, it is characterized in that comprising that EMI suppresses circuit (1), rectification circuit (2), power factor correction circuit (3), pwm control circuit (4), current rectifying and wave filtering circuit (5) and startup suppress circuit (6), wherein EMI suppresses the input of the output termination rectification circuit (2) of circuit (1), connect behind the output serial connection power factor correction circuit (3) of rectification circuit (2) and start the input that suppresses circuit (6), the output termination of pwm control circuit (4) starts the control end that suppresses circuit (6), starts the input of the output termination current rectifying and wave filtering circuit (5) that suppresses circuit (6).
2. LED control circuit according to claim 1, it is characterized in that described pwm control circuit (4) comprises pwm chip (U1), power switch pipe (Q1) and four resistance (R7, R11, R12, R13), the grid of the OUT termination power switch pipe (Q1) of pwm chip (U1) wherein, the VCC end of pwm chip (U1) and the drain electrode of power switch pipe (Q1) connect respectively to start and suppress circuit (6), the CS end of pwm chip (U1) connects an end of the 7th resistance (R7) respectively and starts and suppresses circuit (6), the FB end of pwm chip (U1) connects an end of the 11 resistance (R11) respectively and starts and suppresses circuit (6), the source electrode of power switch pipe (Q1) connects the other end of the 7th resistance (R7) respectively, one end of the 12 resistance (R12) and an end of the 13 resistance (R13), the GND of pwm chip (U1) end connect the 11 to the 13 resistance (other end of R11～R13) and start and suppress circuit (6) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102790317A CN101938873A (en) | 2010-09-10 | 2010-09-10 | Led control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102790317A CN101938873A (en) | 2010-09-10 | 2010-09-10 | Led control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101938873A true CN101938873A (en) | 2011-01-05 |
Family
ID=43391931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102790317A Pending CN101938873A (en) | 2010-09-10 | 2010-09-10 | Led control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101938873A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005011739A (en) * | 2003-06-20 | 2005-01-13 | Matsushita Electric Ind Co Ltd | Circuit for preventing malfunction when dimming and lighting system |
| US20080278092A1 (en) * | 2007-05-07 | 2008-11-13 | Philips Solid-State Lighting Solutions, Inc. | High power factor led-based lighting apparatus and methods |
| CN101562397A (en) * | 2009-05-27 | 2009-10-21 | 成都芯源系统有限公司 | Dual-mode constant current control method based on third winding detection and circuit thereof |
-
2010
- 2010-09-10 CN CN2010102790317A patent/CN101938873A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005011739A (en) * | 2003-06-20 | 2005-01-13 | Matsushita Electric Ind Co Ltd | Circuit for preventing malfunction when dimming and lighting system |
| US20080278092A1 (en) * | 2007-05-07 | 2008-11-13 | Philips Solid-State Lighting Solutions, Inc. | High power factor led-based lighting apparatus and methods |
| CN101562397A (en) * | 2009-05-27 | 2009-10-21 | 成都芯源系统有限公司 | Dual-mode constant current control method based on third winding detection and circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110105 |