INTERFACE CONVERTER COMMON MODE VOLTAGE CONTROL
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United States of America Patent
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Aug 22, 2016
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Aug 22, 2016
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Aspects of interface converter common mode (CM) voltage control are described. In one embodiment, a bi-directional alternating current (AC) to direct current (DC) interface converter system includes an AC-DC converter between an AC power system and an interface link and a DC-DC converter between a DC power system and the interface link. The AC-DC converter can include a bridge converter having power switches, such as field-insulated gate bipolar transistors (IGBTs) or another power semiconductor device. The system also includes a control loop that generates control signals for switching the power switches of the AC-DC converter, and a CM control loop that injects a CM control signal into the control loop. By injecting the CM control signal into the control loop, low-frequency ripple and asymmetry between positive and negative output voltages of the DC power system can be reduced.
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