Power conversion device
AssigneeMitsubishi Electric Corporation
InventorRyotaro Harada
Life of this patent
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Abstract
The resonant inverter circuit includes two or more switch elements. A detector detects an output current of the switch elements. A resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal when a number of times an absolute value of a current detected by the detector at turn-off of the switch elements is equal to or greater than a threshold is equal to or greater than a predetermined number of times that is two or more during a predetermined period that is equal to or longer than two switching periods of the switch elements. A controller causes the resonant inverter circuit to stop a switching operation when the resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal.
Claims5
A power conversion device, comprising:
- a resonant inverter circuit including two or more switch elements;
- a detector to detect output currents of the switch elements;
- a resonance determiner to determine that a resonance frequency of the resonant inverter circuit is abnormal when a number of times, in which an absolute value of a current detected by the detector at turn-off of the switch elements is equal to or greater than a threshold, is equal to or greater than a predetermined number of times that is two or more during a predetermined period that is equal to or longer than two switching periods of the switch elements;
- and
- a controller to cause the resonant inverter circuit to stop a switching operation when the resonance determiner determines that the resonance frequency of the resonant inverter circuit is abnormal.
Dependencies are inferred from the claim text.