Power conversion circuit
AssigneeFuji Electric Co., Ltd.
InventorRyuji YAMADA
Life of this patent
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Abstract
In a power conversion circuit in which a grounded capacitor is connected to a main circuit that converts power through operation of a semiconductor switching device, a control IC that supplies a drive signal to the semiconductor switching device generates a cancellation voltage for canceling out a conducted emission that develops across terminals of the grounded capacitor as a result of the operation of the semiconductor switching device by using the drive signal (gate signal) to control a charge/discharge current of a compensation capacitor in a compensation circuit that is externally connected to the main circuit.
Claims9
A power conversion circuit, comprising:
- a semiconductor switching device;
- a main circuit that performs power conversion through switching on and off of the semiconductor switching device, the main circuit including a controller that supplies a drive signal to the semiconductor switching device to switch on and off the semiconductor switching element,
- a grounded capacitor connected to the main circuit;
- a compensation circuit separate from the main circuit, connected to the main circuit, the compensation circuit including a compensation capacitor;
- and
- a compensation generator connected to the compensation circuit, the compensation generator charging and discharging the compensation capacitance on the basis of the drive signal so as to generate a cancellation voltage across the compensation capacitor that causes a conducted emission voltage across terminals of the grounded capacitor generated as a result of the switching on and off of the semiconductor switching device to be cancelled out, thereby eliminating conducted emission,
- wherein the compensation generator is included within the main circuit or within the compensation circuit.
Dependencies are inferred from the claim text.