Direct-current power supply device, motor drive device, blower, compressor, and air conditioner

A direct-current power supply device comprising:

• a reactor having one end connected to an alternating-current power supply;
• a bridge circuit that converts a first voltage into a direct-current voltage, the bridge circuit being connected to another end of the reactor, the first voltage being an alternating-current output of the alternating-current power supply;
• a capacitor that smoothes a second voltage, the second voltage being a direct-current voltage of the bridge circuit;
• a first current detector that detects a first current flowing as an alternating current between the alternating-current power supply and the bridge circuit;
• a second current detector that detects a second current flowing as a direct current between the bridge circuit and the capacitor;
• a first overcurrent determination unit that determines on a basis of a detected first current value whether or not the first current is an overcurrent;
• and
• a second overcurrent determination unit that determines on a basis of a detected second current value whether or not the second current is an overcurrent,
• wherein a threshold that the first overcurrent determination unit uses in detecting an overcurrent is smaller than a threshold that the second overcurrent determination unit uses in detecting an overcurrent,
• wherein the bridge circuit stops operating when a determination result of either the first overcurrent determination unit or the second overcurrent determination unit indicates an overcurrent.