Isolated type LED light fixture adjustable light power supply

Abstract

The invention provides an isolated type LED light fixture adjustable light power supply. An input terminal of the power supply is connected into a silicon control light modulator, and an output terminal of the power supply is connected into an LED load. Through an operation of the silicon control light modulator by a user, a drive circuit of the power supply can be controlled, an average value of driving circuit input voltage and current of a driving circuit output terminal are changed, and a purpose of brightness control and adjustment of the LED load is realized. The power supply is characterized in that: a circuit of the power supply comprises and EMI filter circuit, a bridge rectifier filter circuit, a pre-stage LC filter circuit, an input voltage buffer circuit, a transformer, an output circuit, a controllable silicon current loop holding circuit, a light regulating voltage detection circuit, a switching frequency set circuit, a light regulating driver chip, an overcurrent detection absorption circuit, an LED current detection circuit, a chip power supply circuit, and an input current detection circuit. The power supply can be compatible with a silicon control light modulator on the market. The power supply driving circuit has good safety performance and can effectively limit surge current, the LED load is more stable in working condition, and higher working efficiency is ensured.

Description

technical field [0001] The invention relates to an isolated dimmable power supply for LED lamps, belonging to the technical field of LED lamp power supplies. Background technique [0002] In the field of lighting technology, LED light source, as a new type of green energy-saving light source product, has been widely used in various industries in society. Compared with traditional lighting fixtures, LED semiconductor lighting has energy saving, environmental protection, long service life, and easy control. Advantages, in line with my country's economic development guidelines for energy conservation and emission reduction. [0003] The power supply is an important part of the supporting use of LED lamps. The design of the power supply circuit is directly related to the safety, energy saving effect and service life of LED lamps. [0004] Most of the existing dimmable power supplies for LED lamps use a non-isolated drive circuit design scheme, mainly using a dimming drive chip w...

AI Technical Summary

Problems solved by technology

This non-isolated power supply dimming solution has unreasonable design, poor safety, and low work efficiency, and cannot well meet the needs of LED lighting supporting production.

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