A high-voltage, wide-voltage input range feedback DC electronic load circuit

Abstract

The invention discloses a high voltage, wide voltage input range feedback type DC electronic load circuit, which includes an isolated DC / DC converter, a DC / AC converter and a control unit; / DC converters and DC / AC converters realize grid-connected energy feedback; isolated DC / DC converters adopt a two-stage structure, including two-phase interleaved parallel BOOST converters and LLC-DCX converters; DC / AC converters adopt T‑type inverter; control unit includes sampling circuit and DSP digital control platform. The present invention is suitable for discharge test of various battery combinations, virtual load test of natural energy (solar battery array, wind power generation), etc., and has wide input voltage range, high maximum input voltage, high frequency isolation, high efficiency, energy saving and environmental protection and other advantages, and has advantages that existing circuits do not have.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, in particular to a feedback type DC electronic load circuit with high voltage and wide voltage input range. Background technique [0002] The energy crisis in today's society is becoming more and more serious, and energy recovery and reuse can effectively alleviate the energy crisis. With the rapid development of national defense, aviation, communication, transportation and other fields, energy storage devices such as batteries have also been widely developed. Battery discharge testing and aging testing are essential links. Traditional tests use energy-consuming loads, which waste power and generate a lot of heat and noise. The regenerative DC electronic load can maximize the recycling of the electric energy absorbed by the electronic load, which greatly reduces the cost, and also complies with the national policy of energy conservation and environmental protection in today's...

AI Technical Summary

Problems solved by technology

At present, there are mainly three types of research on regenerative DC electronic loads. The first one is composed of BOOST converter and grid-connected inverter DC / AC converter cascaded, but this solution does not have high-frequency transformer isolation, behind the DC / AC converter Connecting to a power frequency transformer to achieve isolation cannot avoid the inherent shortcomings of the power frequency transformer

The second type is composed of cascaded phase-shifted full-bridge converters and grid-connected inverters. Although this type of solution can achieve high-frequency isolation, it is not suitable for wide voltage input ranges.

The third type is composed of BOOST converter, phase-shifted full-bridge converter and grid-connected inverter. The switch cannot be realized in a full range, and the control is relatively complicated, which increases the complexity of the whole machine

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