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Overvoltage protection circuit applied to alternative current LED drive system

An overvoltage protection circuit and LED driving technology, which is applied to the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of complex circuit structure, insufficient stability and reliability, and inability to realize step-by-step overvoltage protection, so as to achieve stable and reliable circuits , The effect of simple circuit structure

Active Publication Date: 2015-04-01
ZHEJIANG HAOTING LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the overvoltage protection circuits of the existing AC LED drive systems used in LED lighting fixtures are composed of many discrete components.

Method used

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  • Overvoltage protection circuit applied to alternative current LED drive system
  • Overvoltage protection circuit applied to alternative current LED drive system
  • Overvoltage protection circuit applied to alternative current LED drive system

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Please refer to figure 1 , the present invention is applied to the overvoltage protection circuit in the AC LED drive system, which includes resistors R1, R2, a voltage setting module 1, a ramp voltage module 2, a reference voltage generating module 3, and a constant current control module 4; the resistor R1 and Resistor R2 forms a voltage divider circuit, which is used to detect the voltage of LED module 5 in the lamp, and the voltage at the voltage divider point between resistor R1 and resistor R2 is the divided voltage (Vb); the voltage setting module 1 is used to set The required protection voltage; ramp voltage module 2 is used to recalibrate the voltage obtained by the voltage divider circuit, and the obtained output terminal voltage (V) has a good negative correlation with the divided voltage (such as figure 2 shown); the reference voltage generation mo...

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Abstract

The invention discloses an overvoltage protection circuit applied to an alternative current LED drive system. The overvoltage protection circuit comprises a resistor R1, a resistor R2, a voltage setting module, an oblique wave voltage module, a reference voltage generating module and a constant-current control module. In the time of work, when the voltage setting module and the oblique wave voltage module detect the voltage of an LED module in a lamp to be larger than protection voltage through a voltage division circuit, the voltage setting module and the oblique wave voltage module can generate corresponding signals, and the signals are chosen and combined through an adder and reference voltage generated by the reference voltage generating module and input to the constant-current control module. The constant-current control module controls currents of an LED in the lamp to be reduced, and therefore the voltage of the LED module in the lamp is reduced. According to the overvoltage protection circuit, only few discrete elements are used, the structure of the circuit is simple, and the circuit is stable and reliable. In addition, the voltage setting module is further used for setting turn-off voltage so as to achieve the function of step-by-step overvoltage protection.

Description

technical field [0001] The invention relates to the technical field of LED drive systems, in particular to an overvoltage protection circuit applied in an AC LED drive system. Background technique [0002] LED (Light Emitting Diode, Light Emitting Diode) is a new generation of light source that uses semiconductor materials as the electro-optical conversion medium. It has the characteristics of energy saving, environmental protection, long life and small size. It will soon replace energy-saving lamps and become the mainstream lighting. With the implementation of the global ban on production and sales of incandescent lamps, LED lighting will face the opportunity to replace incandescent lamps, with a market size of hundreds of billions. [0003] An AC LED driving system generally used in LED lighting fixtures is usually provided with an overvoltage protection circuit to protect the voltage of the LED module in the lighting fixture from overvoltage. However, most of the overvol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 刘成军黄杰忠齐良颉
Owner ZHEJIANG HAOTING LIGHTING