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An Anti-interference Constant Current LED Driving Circuit

A technology of LED driving and current regulating circuit, applied in the field of LED driving, can solve the problems such as affecting the driving effect of the driving circuit, abnormal flickering, faulty overvoltage protection interference of the driving circuit, etc., and achieve the effect of improving the anti-interference characteristics

Active Publication Date: 2018-04-13
FREMONT MICRO DEVICES SHENZHEN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] figure 1 It is a common isolated switch constant current LED drive circuit implemented by a single-winding transformer. In this drive circuit, if there is an interference signal (such as: lightning strike, electromagnetic interference, etc.) to interfere with it, the inductance L is at the node VD Interference signals will be generated, and at the same time, due to the parasitic capacitance of the drain and source of the MOS transistor M1, the interference signal at the node VD will act on the node VS, causing the wrong overvoltage protection interference to easily occur in the drive circuit, resulting in the The drive circuit activates the overvoltage protection due to the interference signal, causing the LED to flicker abnormally, which seriously affects the driving effect of the drive circuit

Method used

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  • An Anti-interference Constant Current LED Driving Circuit

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Embodiment

[0032] The embodiment of the present invention provides an anti-interference constant current LED driving circuit, see figure 2 ,include:

[0033] The input end of the rectifier filter circuit 100 connected to the AC power supply, the input end of the power supply circuit 200 connected to the rectifier filter circuit 100, is used to control the input LED load (e.g. figure 2 The current control module 300 of the two diodes connected in series), the current adjustment circuit 400 for sending sampling signals to the control module 300, the switching circuit 500 respectively connected to the power supply circuit 200 and the current adjustment circuit 400, the power supply circuit 200 is also connected to the control The module 300 is connected to provide operating voltage for the control module 300.

[0034] The control module 300 may include: a constant current control unit 301, a state detection unit 302, a logic circuit 303, a driving unit 304, a first comparator 305, and a second ...

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Abstract

The invention discloses an anti-interference constant current LED driving circuit, which includes: a rectification filter circuit, a power supply circuit, a control module, a current regulation circuit, and a switch circuit. The control module includes: a constant current control unit, a state detection unit, a logic circuit, A driving unit, a first comparator, and a second comparator. In the constant current LED drive circuit provided by the present invention, when the state detection unit detects that the discharge time is less than the first minimum discharge time, the OVP protection will not be triggered immediately in this working cycle, but will be in the next two working cycles ( There is a preset time interval between the three working cycles), according to the new judgment standard (whether the discharge time is less than half of the first minimum discharge time), the discharge time is further judged, only when the OVP protection is continuously triggered, The corresponding shutdown protection will be carried out, which can greatly improve the anti-interference characteristics of the constant current LED drive circuit to interference signals.

Description

Technical field [0001] The present invention relates to the technical field of LED driving, in particular to an anti-interference constant current LED driving circuit. Background technique [0002] Light Emitting Diode (Light Emitting Diode, referred to as "LED") as a kind of energy-saving and high-efficiency lighting equipment, has a wide range of applications in life, and its supporting drive circuit has also attracted more and more attention. A good drive circuit can bring To ensure stable and reliable driving effect, and to ensure the lighting effect of LED. [0003] figure 1 It is a common isolated switch constant current LED drive circuit implemented by a single-winding transformer. In the drive circuit, if interference signals (such as lightning strikes, electromagnetic interference, etc.) interfere with it, the inductor L is at node VD Interference signals will be generated. At the same time, due to the parasitic capacitance of the drain and source of the MOS transistor M1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/37Y02B20/30
Inventor 许如柏黄冲黄裕泉
Owner FREMONT MICRO DEVICES SHENZHEN LTD
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