A full-bridge llc resonant isolation high-power high-voltage power supply circuit

Abstract

The invention relates to a full-bridge LLC resonant isolation high-power high-voltage power supply circuit, the isolation control circuit is respectively connected with an auxiliary circuit, an output current feedback circuit, a full-bridge LLC resonant and control drive circuit, a high-voltage output and a voltage feedback circuit, and the high-voltage output and voltage The feedback circuit is respectively connected with the output current feedback circuit, the full-bridge LLC resonance and control drive circuit, the auxiliary circuit is connected with the output current feedback circuit, and the power supply input is respectively connected with the auxiliary circuit and the full-bridge LLC resonance and control drive circuit. Adopt full-bridge LLC resonant drive transformation, PWM control mode, realize the zero-voltage conduction of the power switch tube, zero-current shutdown of the output rectifier tube, reduce the switching power loss; the conversion efficiency of the power supply is high; in a wide input Within the range of voltage and output load, it has good regulation characteristics; the input and output adopt isolation mode, which reduces the direct crosstalk between circuits, and improves the performance index and reliability of the power supply.

Description

technical field [0001] The invention relates to a full-bridge LLC resonant isolation high-power high-voltage power supply circuit applied in the fields of electronic industry, scientific research and the like. Background technique [0002] At present, in the high-voltage power supply market, on the one hand, many of them adopt the traditional hard-switching conversion mode. The higher the operating frequency, the greater the switching loss and the lower the conversion efficiency. At the same time, the switch tube will produce a large di / dt and du / dt when it is working, which will increase the electromagnetic interference and affect the normal operation of the equipment around the power supply, especially for high-power high-voltage power supplies. The above phenomenon is particularly prominent; another On the one hand, for a DC / DC high-power high-voltage power supply with a common ground, due to the large input current and high output power, the input, output and control par...

AI Technical Summary

Problems solved by technology

[0002] At present, in the high-voltage power supply market, on the one hand, many of them adopt the traditional hard switching conversion mode. The higher the operating frequency, the greater the switching loss and the lower the conversion efficiency.

At the same time, the switch tube will produce a large di / dt and du / dt when it is working, which will increase the electromagnetic interference and affect the normal operation of the equipment around the power supply, especially for high-power high-voltage power supplies. The above phenomenon is particularly prominent; another On the one hand, for a DC / DC high-power high-voltage power supply with a common ground, due to the large input current and high output power, the input, output and control parts are directly connected in the circuit. When it is working, its own control part is easily affected by the power circuit. Crosstalk, etc., causing loop self-excitation or harmonic increase and other phenomena, resulting in a decline in the performance of the power supply

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