Triode overcurrent protection type energy-saving power supply circuit for cold-light LED

Abstract

The invention discloses a triode overcurrent protection type energy-saving power supply circuit for a cold-light LED. The triode overcurrent protection type energy-saving power supply circuit is characterized by mainly comprising a control chip U2, a triode VT2, a diode withstand voltage circuit, a rectification filter circuit, a voltage-stabilization driving circuit, a current regulating circuit, a polar capacitor C5, a diode D3, and a triode overcurrent protection circuit, wherein the N pole of the diode D3 is connected with an RC pin of the control chip U2 while the P pole of the diode D3 passes through a resistor R7 and a resistor R8 and then is connected with a VREF pin of the control chip U2; and the triode overcurrent protection circuit is connected between an OUT pin of the control chip U2 and the current regulating circuit in series. The triode overcurrent protection type energy-saving power supply circuit has a super-strong withstand voltage capability, can output stable current, and can effectively ensure the stability of the luminance of a blue-light LED lamp. Compared with the existing power supply circuit, the energy consumption of the triode overcurrent protection type energy-saving power supply circuit is reduced by 55% or more.

Description

technical field [0001] The invention relates to the field of electronic energy saving, in particular to an energy-saving power supply circuit for triode overcurrent protection type cold light LED. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. Since LED lamps are different from traditional incandescent lamps, they need to be driven by a dedicated power supply circuit. However, the current power supply circuit used in LED lamps is not only vulnerable to external voltage fluctuations, but also has poor voltage resistance, high energy consumption, and unstable output current, which leads to unstable brightness of LED lamps, power consumption, and use. Short life. [0003] Therefore, it is urgent to provide an LED power supply circuit that can not only improve the withstand voltage capability...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of poor withstand voltage capability, high energy consumption and unstable output current in the LED voltage circuit in the prior art, and provide an energy-saving power supply circuit for triode overcurrent protection type cold light LED

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