Power converting apparatus and heat pump apparatus

A power converting apparatus for applying to a load an alternating-current voltage converted from a direct-current voltage, the power converting apparatus comprising:

• an inverter that receives a PWM signal and applies the alternating-current voltage to the load;
• an inverter control unit that generates the PWM signal and supplies the PWM signal to the inverter, and generates a voltage command value;
• and
• a current detecting unit to detect an electric current flowing to the inverter, the current detecting unit being configured by a shunt resistor, wherein:
• the frequency of the PWM signal is an integer multiple of the frequency of the alternating-current voltage,
• the alternating-current voltage includes a plurality of positive pulses and a plurality of negative pulses in one cycle of the alternating-current voltage, the number of the positive pulses being equal to the number of the negative pulses,
• the inverter includes a plurality of switching elements, each of the plurality of switching elements being driven on the basis of a PWM control, and
• when a phase relation between a rising edge zero cross of the voltage command value and a bottom of a carrier is defined as a phase difference, the phase difference is controlled such that a line voltage becomes point symmetrical, the line voltage being obtained by driving the plurality of switching elements using the PWM signal.