Input-parallel output-parallel half-bridge converter and current-sharing control system and method thereof

Abstract

The invention provides an input-parallel output-parallel half-bridge converter and a current-sharing control system and method thereof. The converter comprises a power supply 1, a capacitor bridge arm 2, a switching tube bridge arm 3, a transformer module 4, a rectification diode module 5, a filtering inductor module 6, a filtering capacitor module 7 and a load 8, wherein the power supply 1, the capacitor bridge arm 2, the switching tube bridge arm 3, the transformer module 4, the rectification diode module 5, the filtering inductor module 6, the filtering capacitor module 7 and the load are sequentially connected. According to the method, output quantity of a voltage ring is used for providing a common reference current for a current inner ring of each module, output current sharing is achieved, and the dynamic performance of the system is also improved.

Description

technical field [0001] The invention belongs to the field of electric equipment and control, and in particular relates to a half-bridge converter with parallel input and parallel output, a current equalization control system and a method. Background technique [0002] In the power supply design of a single converter, problems such as large input and output current pulsation, high voltage stress of power devices, large loss, electromagnetic interference of the converter and high price must be faced. Input-side parallel-connected output-side parallel converters are suitable for power systems that require high current, low voltage, safety and reliability. However, the commonly used dual-transistor forward converter and full-bridge converter are combined in parallel with input and output in parallel. These two topologies require more switch tubes and need to add multiple pairs of input voltage equalizing capacitor bridge arms; because each module There are differences in device...

AI Technical Summary

Problems solved by technology

However, the commonly used dual-transistor forward converter and full-bridge converter are combined in parallel with input and output in parallel. These two topologies require more switch tubes and need to add multiple pairs of input voltage equalizing capacitor bridge arms; because each module There are differences in device parameters, which will inevitably lead to unbalanced power of each module, complex control process and high cost

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