A method for solving bias magnetism

Abstract

The method for solving the magnetic bias proposed by the present invention can be adjusted slowly without severe magnetic bias, which ensures that the bias is prevented under most working conditions, and the output characteristics are not affected; in the case of severe bias The capacitor voltage is quickly discharged through the DC blocking capacitor voltage discharge circuit, and the further deterioration of the bias magnetic field is suppressed to ensure the high reliability of the system. Magnetic generation improves reliability.

Description

technical field [0001] The invention relates to the field of high-frequency switching power supply and electric vehicle charging module, in particular to a method for solving bias magnetism. Background technique [0002] At present, there are many topologies in the power supply field, and many new architectures (including two-level, three-level and multi-level full-bridge topologies) are derived from the full-bridge topology as the basic structure. In the high-power field, the phase-shifted full bridge and dual active bridge (bidirectional topology) schemes are widely used. The common characteristics of these topologies are high frequency, isolation and transformer work in quadrants 1 and 3. Ideally, 1, The 3-quadrant drive is completely symmetrical, and there is no magnetic bias phenomenon in the transformer in a complete cycle. However, in the actual circuit, due to the difference in electronic components and the timing accuracy of the software control strategy, there will...

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Problems solved by technology

The above method has a good effect in solving the case of driving asymmetry and slowly changing cumulative bias. For some special working conditions, such as sudden full load or sudden unloading, the calculation result of the loop will cause the duty cycle to change rapidly. The duty cycle of each beat is different. Since the duty cycle changes rapidly, the magnetic bias may be very serious within a few or dozens of switching cycles. The transformer is saturated and the current rises rapidly, and the circuit has a large Therefore, in this case, a method to quickly solve the bias magnetic field is proposed, that is, by connecting the switching tube in parallel with the DC blocking capacitor, by quickly releasing the energy of the DC blocking capacitor, the capacitor voltage drops rapidly, and at the same time matching and adjusting the drive of the switching tube Timing strategy to effectively solve the magnetic bias problem

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