Battery charging and discharging device

Abstract

A battery charge and discharge device comprises a battery charge and discharge assembly and a full digital controller, which is characterized in that the battery charge and discharge assembly is composed of an AC-DC voltage PWM controllable rectifier part, a DC link filter part and an AC-DC bidirectional chopper part which are in cascade connection; the AC-DC voltage PWM controllable rectifier part is formed by the cascade connection of an AC inlet inductance and a full control rectifier bridge, wherein the AC inlet inductance is formed by the cascade connection of a transformer output leakage inductance and an AC inductance, and the bridge arm of the full control rectifier bridge is formed by the cascade connection of power switching elements; the DC link filter part is formed by the parallel connection of a DC capacitance and a high frequency absorption capacitance; the AC-DC bidirectional chopper part is formed by the series connection of power switching elements and a DC output inductance. The battery charge and discharge device has the advantages that power factor approaches 1 when the battery is being charged, input current harmonics content is low, output voltage range is wide, output current precision is high and the like, and the battery charge and discharge device realizes safe machine halt in case of power failure at the same time.

Description

technical field [0001] The invention relates to a storage battery charging and discharging device, which belongs to the field of power electronic equipment. Background technique [0002] As a reliable chemical power source, batteries have been widely used in industrial fields such as power systems, transportation, and portable electronic products. Especially in the departments of national defense, telecommunications and finance, as the backup power supply of the system, the battery is one of the key components in these systems. With the development of the economy, the use of batteries has increased year by year in recent years, which puts forward higher requirements for the production capacity of battery manufacturers. The charging and discharging device of the battery is the key equipment for its production and testing. Its function is mainly to convert the power frequency AC voltage of the power supply into an adjustable DC voltage, and complete the charging and dischargi...

AI Technical Summary

Problems solved by technology

This method is superior to the thyristor phase-controlled rectification form in terms of input power factor index, the control is simple, and there is no problem of inverter failure caused by the sudden drop of the power grid during discharge, but it requires a large discharge resistor during discharge, which is not sufficient. use energy

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