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Electric power converting device

  • US 9,991,785 B2
  • Filed: 11/06/2015
  • Issued: 06/05/2018
  • Est. Priority Date: 12/15/2014
  • Status: Active Grant
First Claim
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1. An electric power converting device for converting DC power to AC power by a PWM signal with a predetermined carrier period, comprising:

  • a voltage detector which detects a voltage value between a positive electrode or a negative electrode of a DC power supply connected to the electric power converting device, and a housing of the electric power converting device at a predetermined timing based on the PWM signal;

    a control unit which outputs information on a ground fault of the AC power based on the voltage value detected by the voltage detector; and

    an inverter circuit controlled by the control unit to convert a DC voltage detected by the voltage detection circuit into an AC voltage;

    wherein the voltage detector detects the voltage value through a first low pass filter of which time constant is smaller than the carrier period, and a second low pass filter of which time constant is larger than the carrier period, andthe control unit outputs information on the ground fault of the AC power based on a difference between an output value of the first low pass filter and an output value of the second low pass filter.

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