Power conversion device and method of controlling the same
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United States of America Patent
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Jul 25, 2017
Grant Date -
Jul 30, 2015
app pub date -
Apr 7, 2015
filing date -
Apr 22, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A power conversion device includes an inverter which can convert between DC and AC power by turning on and off bridge-connected semiconductor switching elements with free wheel diodes connected in reverse parallel; and a rotating electric machine, such as an AC generator or motor, which is connected to the AC terminals of the inverter, where when the DC voltage of the inverter is below a specified value when starting the machine, the speed of the machine is detected in a condition where the DC voltage of the inverter is boosted to at least a specified value of the induced voltage of the machine, by intermittently turning on and off at least one of the switching elements, so as to accurately detect the speed of the machine and stably start it even when the DC voltage of the inverter is lower than the induced voltage of the machine.
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