POWER CONVERSION DEVICE
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United States of America Patent
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Issued Date -
Jun 18, 2015
app pub date -
Jun 12, 2012
filing date -
Jun 29, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power conversion device including an inverter which converts a direct current voltage to an alternating current voltage of any magnitude and frequency using semiconductor switches, and supplies the voltage to a load such as a motor, wherein a switch is provided in the direct current portion of the inverter. A capacitor is connected, via the switch, between a positive and a negative electrode of the direct current power source, and a constant voltage element is connected in parallel to the capacitor. A varistor, a zener diode, or an avalanche diode, or alternatively, a combination of the zener diode and a self-turn-off semiconductor element (such as an IGBT or a MOSFET), or the like, is used as the constant voltage element. Each part of the power conversion device is thereby protected against overvoltage, thus avoiding an increase in the capacitance and volume of the capacitor.
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