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In PWM converters, high dv/dts due to fast switching of the power devices can cause serious common mode electromagnetic interference (CM EMI). Theoretically, a single-phase full-bridge inverter under bipolar SPWM operation should produce very low CM noise because the two phase legs operating in a complementary manner can compensate for each other. However, in practice this ideal scenario will never...
A modified equivalent circuit for common-mode (CM) current of single-phase full-bridge inverters is proposed. The circuit allows application of superposition theorem, and it provides more insights into the propagation mechanism of the CM noise. Simulations and experiments are conducted on an inverter test setup to validate the proposed circuit. Three operation conditions are studied: (1) with one...
Theoretically, a full-bridge converter under bipolar PWM should produce very little common mode noise because the two phase-legs can compensate for each other, but this feature is often disrupted by different transmission delays of the gating signals. In this paper, a method to address this problem through automatic tuning of the pulse edges of gating signals is proposed. Specifically, the CM noise...
In PWM converter, the serious electromagnetic interference (EMI) is occurred due to high speed operation of switch devices. In this paper, production mechanism of common mode (CM) current in single phase full-bridge converter is analyzed, and severe affection to CM current owing to different transmission delays of two drive pulses is illustrated. It is proposed a digital CM current suppression method...
In PWM converter, the serious electromagnetic interference (EMI) is occurred due to high speed operation of switch devices. In this paper, production mechanism of common mode (CM) current in single phase full-bridge converter is analyzed, and severe affection to CM current owing to different transmission delays of two drive pulses is illustrated. It is proposed a digital CM current suppression method...
Theoretically, a full-bridge converter under bipolar PWM should produce very little common mode noise because the two phase-legs can compensate for each other, but this feature is often disrupted by different transmission delays of the gating signals. In this paper, a method to address this problem through automatic tuning of the pulse edges of gating signals is proposed. Specifically, the CM noise...
Different common mode (CM) EMI suppression methods are discussed and a parallel-connected active CM EMI suppression technique with digital closed-loop control is presented. A novel CM noise evaluation measure based on the energy of CM noise current is proposed. The relationship between the energy of CM noise current and the lead/lag time of compensating current is studied. It is shown that there are...
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