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Based on conventional H-bridge topologies of magnet power supplies, ahigh-frequency common-mode equivalent model was established. It is pointed outthat the two phase legs have complementary effect of common-mode noise underbipolar PWM modulation. Due to the phase difference of the driving pulses inthe real product, however, the effect of common-mode cancellation is greatlydisrupted. Based on the common-mode equivalent model, a frequency domainanalysis was carried out to determine the theoretical relationship between thecommon-mode noise intensity and the phase difference, which can guide theadjustment of the driving pulses. It was also found that the increase ofswitching frequency will aggravate the common-mode noise caused by the phasedifference. To reduce the common-mode noise, a method that automaticcalibration of the driving pulses was evaluated by a simulation andexperimentally. Finally, a prototype is built, and the results of the prototypeshow that the proposed method can effectively reduce the common-mode noise.

Development of a magnet power supply with a common-mode cancellation method based on automatic calibration of driving pulses