Synchronous rectification circuit

Abstract

The invention discloses a synchronous rectification circuit, which comprises a power input circuit, a rectification and filtering circuit, an oscillation IC control circuit, a primary side feedback circuit, a high-frequency transformer and a synchronous rectification output circuit, and is characterized in that the rectification and filtering circuit is connected with the power input circuit and performs rectification and filtering on input current, the high-frequency transformer comprises a primary main coil, a primary auxiliary coil and a secondary output coil, the rectification and filtering circuit is connected with the oscillation IC control circuit and the primary main coil of the high-frequency transformer, the primary side feedback circuit is connected with the oscillation IC control circuit and the primary auxiliary coil of the high-frequency transformer and provides operating voltages for the oscillation IC control circuit, and the secondary output coil of the high-frequency transformer is connected with the synchronous rectification output circuit; and the synchronous rectification output circuit replaces a secondary rectification Schottky diode, improves the current output capacity, improves the conversion efficiency and reduces the temperature of an IC.

Description

Technical field [0001] The invention relates to the field of charging circuits, in particular to a synchronous rectifier circuit. Background technique [0002] Power charger is a kind of household equipment commonly used in people's daily life. Many household appliances such as mobile phones, computers, electric cars, etc. will use chargers; the styles and objects of existing chargers are different, but there are many existing chargers. The use of discrete components and the use of a large number of discrete components leads to high processing costs, complex processes and high product repair rates. In addition, the circuit structure is more complex, the circuit reliability is not high, the circuit is linear, the load regulation is poor, and it consumes more energy. The current output capability is poor and the conversion efficiency is low. Summary of the invention [0003] The purpose of the present invention is to provide a synchronous rectifier circuit with low production cost,...

AI Technical Summary

Problems solved by technology

[0002] The power charger is a kind of household equipment commonly used in people's daily life. Many household appliances such as mobile phones, computers, and electric vehicles will use chargers; the styles and objects of use of existing chargers are different, but there are many The use of discrete components and the use of a large number of discrete components lead to high processing costs and complex processes leading to a high repair rate of products. In addition, the circuit structure is relatively complicated, the circuit reliability is not high, the circuit linearity, load regulation are poor, and it consumes more energy. Poor current output capability and low conversion efficiency

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