Electric power conversion device with snubber circuit
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United States of America Patent
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Mar 5, 2019
Grant Date -
Jan 4, 2018
app pub date -
Jun 27, 2017
filing date -
Jun 30, 2016
priority date (Note) -
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Abstract
If the capacitance of a snubber capacitor, the inductance of a coil and the magnitude of a resistor are specified such that the resonance frequency of the snubber circuit coincides with the ringing frequency of the transistor, and the impedance of the first loop at the resonance frequency becomes smaller than the impedance of the second loop at the resonance frequency, a current component due to ringing flows in the snubber circuit, and energy is consumed by the resistor. Therefore, it is possible to quickly converge ringing.
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