Low-voltage large-current synchronous rectification power source

Abstract

The invention provides a low-voltage large-current synchronous rectification power source. A synchronous rectification IC TEA1791T from NXP company is employed for controlling the switching on and switching off of an MOS tube IRFB3207 so as to realize synchronous rectification output. The low-voltage large-current synchronous rectification power source is suitable for synchronous rectification of secondary output of switch transformer of a non-continuous transmission mode or like a flyback converter. The low-voltage large-current synchronous rectification power source is characterized in that the power source is composed of a power-source-filtering overcurrent-protection circuit single-phase bridge-type rectification filtering circuit, a switch power control module, a synchronous rectification circuit and a voltage loss filtering protection circuit, wherein the power-source-filtering overcurrent-protection circuit single-phase bridge-type rectification filtering circuit provides working frequency voltage without higher harmonics and outputs smooth direct current to the switch power control module. The direct current flows through the low-voltage large-current synchronous rectification circuit and the IC controls the low-resistance large-current low-voltage MOS tube to perform switching on and switching off at a transformer output zero crossing point effectively. Therefore, synchronous rectification is realized.

Description

technical field [0001] The invention relates to the technical field of power supply switching power supply, in particular to a low-voltage and high-current synchronous rectification power supply for industrial production automatic control equipment. Background technique [0002] At present, there are many switching power supplies used in industrial process control systems. Although some manufacturers have adopted new technologies in terms of high-power switching power supplies, considering the power factor, there are still too many discrete components in the selection of components, which makes The overall structure of the switching power supply is difficult to reflect the advantages of new technologies. It is difficult to guarantee its stability and reliability when working in a high-power state, and the failure rate is high. Especially for industrial equipment with a relatively high degree of automation, such a switching power supply is obviously difficult. Adapt to equipm...

AI Technical Summary

Problems solved by technology

Therefore, the traditional diode rectifier circuit can no longer meet the needs of low-voltage, high-current switching power supply with high efficiency and small size, and has become a bottleneck restricting the efficiency of DC / DC converters.

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