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led overvoltage detection circuit and drive circuit and led lighting system

A technology of LED driving and overvoltage detection, applied in lighting devices, electric lamp circuit layout, electric light source, etc., can solve the problem of high cost of LED driving circuit and achieve the effect of low cost

Active Publication Date: 2016-09-21
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present application provides an LED overvoltage detection circuit, a driving circuit and an LED lighting system to solve the problem of high cost of the LED driving circuit in the prior art

Method used

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  • led overvoltage detection circuit and drive circuit and led lighting system
  • led overvoltage detection circuit and drive circuit and led lighting system
  • led overvoltage detection circuit and drive circuit and led lighting system

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0063] figure 1 It is a structural diagram of an LED overvoltage detection circuit disclosed in the embodiment of the present application.

[0064] see figure 1 , the embodiment of the present application discloses an LED overvoltage detection circuit, the overvoltage detection circuit is applied in the LED drive circuit, and the LED drive circuit includes a power stage circuit 1, a power supply circuit 3, a control circuit 2 and an overvoltage protection cir...

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Abstract

The application discloses an LED overvoltage detection circuit, a drive circuit and an LED lighting system. The LED overvoltage detection circuit is applied to an LED drive circuit. The LED drive circuit includes a power stage circuit, a power supply circuit, a control circuit and an overvoltage protection circuit. , the LED overvoltage detection circuit includes: a control switch Sa, a diode Da and a switch control circuit, and when the power switch tube of the power stage circuit is in an off state, the switch control circuit is used to control the conduction and disconnection of the control switch Sa, that is The output voltage of the power stage circuit can be obtained. It can be seen that compared with the LED overvoltage detection circuit in the prior art, the LED overvoltage detection circuit disclosed in the present application does not need an auxiliary winding to detect the output voltage of the LED drive circuit. Therefore, the cost lower.

Description

technical field [0001] The present application relates to the technical field of light-emitting diode (LED) driving control, and more specifically, relates to an LED overvoltage detection circuit and a driving circuit. Background technique [0002] In an LED lighting system, an LED load is usually driven by an LED drive circuit. Moreover, when the LED lighting system is working normally, the LED drive circuit needs to detect the running state of the LED load at all times. If the overvoltage of the LED load is not detected in time, the LED load may be damaged, so that the LED drive circuit cannot work normally. . Therefore, an overvoltage detection circuit is usually added to the LED drive circuit to avoid damage to the LED load. [0003] At present, the LED drive circuit usually uses an auxiliary winding as an LED overvoltage detection circuit to detect whether the LED load is in an overvoltage state. Taking the power stage circuit of the LED drive circuit as a Buck power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 邓建刘国家
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD