Magnetic bias restraining method and device

Abstract

The embodiment of the invention discloses a magnetic bias restraining method and device. The method comprises the steps of: obtaining a bus voltage U1 when a transformer is subjected to forward excitation and a bus voltage U2 when the transformer is subjected to reverse excitation in a direct current-direct current transformer; determining the magnetic bias compensation amount [Delta]d1 when the transformer is subjected to forward excitation and the magnetic bias compensation amount [Delta]d2 when the transformer is subjected to reverse excitation according to the bus voltage U1 when the transformer is subjected to forward excitation and the bus voltage U2 when the transformer is subjected to reverse excitation; superposing the magnetic bias compensation amount [Delta]d1 when the transformer is subjected to forward excitation and the direct current-direct current transformer loop output duty ratio signal amount to output the superposition value to a switch tube exciting in a forward direction, and superposing the magnetic bias compensation amount [Delta]d2 when the transformer is subjected to reverse excitation and the direct current-direct current transformer loop output duty ratio signal amount to output the superposition value to a switch tube exciting in a reverse direction. According to the embodiment, the magnetic bias restraining of the transformer can be effectively achieved.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a bias suppression method and device. Background technique [0002] In the field of power electronics technology, a DC-DC converter is a circuit that converts a DC power supply into another DC power supply with different output characteristics. In practical applications, due to the difference in the switching speed of the switching tube in the DC-DC converter, the difference in the delay of the driving signal, the difference in the pulse width of the driving signal, etc., long-term work will cause the transformer in the DC-DC converter to appear magnetically biased. [0003] In related technologies, a DC blocking capacitor is added to the topology of the circuit to eliminate transformer bias, and the DC blocking capacitor is connected in series with the transformer winding to block the DC component. Although this solution is simple, the addition of a DC block...

AI Technical Summary

Problems solved by technology

Although this solution is simple, the addition of DC blocking capacitors increases the complexity of the circuit, and the selection of DC blocking capacitors for high current applications is very difficult, and at the same time increases the size and cost of the converter.

Images