A memory dimming circuit

Abstract

The invention relates to a memory dimming circuit, comprising a fuse F1, a current bridge DB1, an optional filter circuit comprising an inductor L2X, an inductor L3X, a controllable non-isolated powerconversion circuit controlled by a WS944P chip, and an intelligent dimming control circuit controlled by a EN8P152 chip. The invention can control one LED lamp string to work in a PWM dimming mode, and can also be extended to control multiple LED lamp strings to work, so in practical application, several corresponding channels can be selected according to specific application for conversion. Compared with the traditional isolation topology of intelligent control dimming circuit, A non-isolated topology power supply design is adopted in the invention, The power supply efficiency can reach morethan 90%, which is obviously improved compared with 70% efficiency of the traditional non-isolated power supply intelligent control circuit, and is particularly suitable for LED lighting applications. The key point of the invention is that the program design of the switch control detection circuit and the software simulating the PWM and memory functions has innovative characteristics. The PWM resolution is above 1KHz, the lighting is soft and does not flicker, and the degree of PWM is fully in line with the requirements of human eye protection.

Description

technical field [0001] The invention relates to a dimming circuit, in particular to a memory dimming circuit. Background technique [0002] At present, the existing technologies using non-isolated power topology on the market can only perform single-segment or multi-segment analog dimming, and cannot latch the brightness required by users. However, digital dimming circuits using isolated topologies are too costly and inefficient. too low. The invention adopts the topology of non-isolated power supply, which can obviously reduce the cost and improve the efficiency. By adopting a simplified instruction type single-chip microcomputer and reducing its operating frequency, it overcomes the problem of large power consumption of traditional intelligent control chips, enables it to be suitable for non-isolated topology circuits, and creatively adds a software to simulate the PWM dimming function in cycles, The hardware PWM dimming technology that replaces the traditional single-ch...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing technologies using non-isolated power topology on the market can only perform single-segment or multi-segment analog dimming, and cannot latch the brightness required by users. However, digital dimming circuits using isolated topologies are too costly and inefficient. too low

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