Two-way digital DC-DC convertor with wide load range

Abstract

The invention discloses a two-way digital DC-DC convertor with a wide load range. The two-way digital DC-DC convertor comprises a high-voltage end, a low-voltage end, a dsPIC30F single chip microcomputer and a transformer. The output end of the dsPIC30F single chip microcomputer is connected with a drive circuit which is provided with a plurality of PWM output ends; the high-voltage end is connected with a high-voltage part rectifying circuit, the low-voltage end is connected with a low-voltage part rectifying circuit, and the transformer is arranged between the high-voltage part rectifying circuit and the low-voltage part rectifying circuit; the output end of the drive circuit is respectively connected to the control end of the high-voltage part rectifying circuit and the control end of the low-voltage part rectifying circuit. Dead time of phase-shifted full-bridge control is adjusted according to the magnitude of loads, meanwhile different rectification modes are selected according to the magnitude of the loads, and therefore the convertor has high efficiency within the wide load range. The convertor is provided with an active clamping circuit preventing vice edge parasitic oscillation, so voltage overshoot can be effectively prevented. Accordingly, the two-way convertor is especially suitable for occasions having a high requirement for efficiency of convertors and a requirement for large changes of the loads.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a bidirectional digital DC-DC converter with a wide load range. Background technique [0002] Bidirectional DC-DC converters are widely used in aerospace, solar power generation, wind power generation, electric vehicles, uninterruptible power supplies and other fields. Bidirectional DC-DC converters can realize bidirectional flow of energy, and the polarity of input / output voltage remains unchanged. But the direction of the input / output current can be changed, the high-voltage side can transmit power to the low-voltage side, and the low-voltage side can also feed energy back to the high-voltage side when necessary. [0003] In applications with large load changes, the load has been changing in the range of 3%-100%. The existing converters generally have higher efficiency when the load is larger, but the efficiency is lower when the load is lower. A...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of narrow load range, high cost, and low efficiency of bidirectional DC-DC converters in the prior art, and proposes a bidirectional digital DC-DC converter with a wide load range. The bidirectional digital DC-DC The converter can adjust the dead time of the phase-shifted full-bridge control according to the load size, and at the same time select different rectification modes according to the load size, so that the converter has high efficiency in a wide load range

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