Power converting apparatus, motor driving apparatus, and air conditioner

A power converting apparatus for converting an alternating-current power supplied from an alternating-current power supply into a direct-current power, the power converting apparatus comprising:

• a first line and a second line, each of the first line and the second line being connected to the alternating-current power supply;
• a first reactor disposed on the first line;
• a first arm comprising a first switching element, a second switching element, and a third line having a first connection point, the first switching element being connected to the second switching element in series by the third line, the first connection point being connected to the first reactor by the first line;
• a second arm connected in parallel with the first arm and comprising a third switching element, a fourth switching element, and a fourth line having a second connection point, the third switching element being connected to the fourth switching element in series by the fourth line, the second connection point being connected to the alternating-current power supply by the second line;
• a first capacitor connected in parallel with the second arm;
• a first driving circuit outputting a first driving signal for driving the first switching element;
• a bootstrap circuit comprising a second capacitor, the second capacitor applying a power supply voltage to the first driving circuit;
• and
• a diode adjusting the power supply voltage,
• wherein a first voltage is lower than a second voltage, the first voltage being a voltage at which a forward current starts to flow in the diode, the second voltage being a voltage at which a forward current starts to flow in a body diode formed in the second switching element, and
• wherein the diode adjusting the power supply voltage is provided between the second capacitor and the first driving circuit.