A switching power supply and audio system based on IR2156

Abstract

The invention discloses a switching power supply and an audio system based on IR2156, The switching power supply includes: an EMI filter circuit, a 220V rectifier circuit,a switching power supply half-bridge driving circuit, a power supply control circuit, an IR2156 current sampling detection circuit, a load current sampling detection and driving circuit and a mains voltage detection and temperature protection circuit. The switching power supply provided by the invention can solve the problem that the power amplifier is burned out due to the instability of the electric network of the user andthe uncertainty of the load, is not easy to cause the machine failure, and is automatically recovered, thereby reducing the maintenance times and the after-sale cost.

Description

technical field [0001] The invention relates to the field of power amplifier design, in particular to an IR2156-based switching power supply and audio system. Background technique [0002] The standard official IR2156 switching power supply circuit diagram in the existing market, such as figure 1 As shown, there are also defects such as load short-circuit burn-in and over-voltage burn-out of the power supply. Even if the limited current circuit still has burn-in phenomenon, it will cause machine failure and high after-sales costs. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a switching power supply based on IR2156, which can solve the problem of burning out the power amplifier due to the instability of the user's power grid and uncertain load, and is not easy to cause machine failure, and automatically Recovery, thereby reducing the number of repairs and reducing afte...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a switching power supply based on IR2156, which can solve the problem of burning out the power amplifier due to the instability of the user's power grid and uncertain load, and is not easy to cause machine failure, and automatically Recovery, thereby reducing maintenance times and reducing after-sales costs

[0004] The second purpose of the present invention is to provide an audio system, which can solve the problem of burning power amplifiers due to unstable power grids and uncertain loads of users, which is not easy to cause machine failures and automatically recovers, thereby reducing maintenance times and reducing after-sales costs

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