Bias suppression method and device

Abstract

The embodiment of the present invention discloses a method and device for suppressing magnetic bias. The method includes: obtaining the bus voltage U1 when the transformer in the DC-DC converter is positively excited and the bus voltage U2 when it is negatively excited; The bus voltage U1 during positive excitation and the bus voltage U2 during negative excitation determine the bias compensation amount Δd1 during forward excitation of the transformer and the bias compensation amount Δd2 during negative excitation; when the transformer is positively excited The bias compensation amount Δd1 of the transformer is superimposed with the output duty cycle signal amount of the DC-DC converter loop, and is output to the switching tube excited in the positive direction, and the bias compensation amount Δd2 of the transformer in negative excitation is converted to DC-DC The loop output duty cycle signal is superimposed and output to the switching tube excited in the negative direction. The bias magnetism of the transformer can be effectively suppressed through the embodiments of the present invention.

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.

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