Overvoltage protection self-recovery energy-saving LED drive power source

Abstract

The invention discloses an overvoltage protection self-recovery energy-saving LED drive power source. According to the overvoltage protection self-recovery energy-saving LED drive power source of theinvention, commercial power is rectified through a rectifier bridge, so that direct current can be outputted; the output end of the rectifier bridge is connected with a load through a switching transformer; the on-off of power source output is controlled through a driving chip; an overvoltage protection circuit is provided to protect a circuit; and the 5 pin of the driving chip is connected with the coil of the switching transformer through an NPN triode. According to the overvoltage protection self-recovery energy-saving LED drive power source of the invention, alternating current inputted bythe rectifier bridge is converted into direct current; the direct current which has passed through the rectifier bridge and the 1 pin of the driving chip are connected into the overvoltage protectioncircuit; and the overvoltage protection circuit is used to protect a driving circuit which adopts the driving chip as a core when a voltage is too high; when the voltage returns to normal, an LED drive automatically resumes normal operation; and therefore, maintenance cost can be reduced, and a problem that an existing LED drive power source cannot be recovered by itself after performing overvoltage protection work can be solved.

Description

technical field [0001] The invention belongs to the technical field of LED driving power supply, in particular to an overvoltage protection self-recovery energy-saving LED driving power supply. Background technique [0002] LED lighting equipment, as a new lighting source in the current lighting field, can save more than 80% energy than traditional incandescent lamps, and has many advantages such as energy saving and environmental protection. [0003] The flyback LED drive power supply composed of chip MP4026, combined with power factor correction technology, adopts peak current mode, high-precision constant output current, input voltage range of 85-265VAC, and power factor of more than 95%. The magnitude of the primary current is sampled to control the constant output current, and high-precision output constant current control can be achieved without optocouplers and other devices. The MP4026 chip has only 6 pins, and the peripheral circuit is very simple, which greatly re...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an overvoltage protection self-recovery energy-saving LED drive power supply, which converts the input AC power into DC power through a rectifier bridge, and the DC power behind the rectifier bridge and pin 1 of the drive chip are connected to the overvoltage protection circuit; The voltage protection circuit is composed of a one-way thyristor, a voltage regulator tube and a matching resistor. Through the overvoltage protection circuit, the drive circuit with the driver chip as the core is protected when the voltage is too high. When the voltage returns to normal, the LED driver also automatically returns to normal. Work, reduce maintenance costs, and solve the problem that the existing LED drive power supply cannot self-recovery after overvoltage protection

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