Patent ID: 11909197
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A motor drive device for driving a motor, the motor drive device comprising:
a reactor having one end connected to an alternating current power supply;
a converter circuit connected to another end of the reactor, the converter circuit converting a first voltage into a direct current voltage, the first voltage being an alternating current voltage output from the alternating current power supply;
a capacitor for smoothing a second voltage, the second voltage being a voltage on a direct current side of the converter circuit;
an inverter circuit for converting direct current power stored in the capacitor into alternating current power, and supplying the alternating current power to the motor;
a first current detector for detecting a first current, the first current being an alternating current flowing between the alternating current power supply and the converter circuit;
a second current detector detecting a second current, the second current being a direct current flowing between the converter circuit and the capacitor;
a first overcurrent determination unit determining, on a basis of a detected value of the first current, whether the first current is an overcurrent or not; and
a second overcurrent determination unit determining, on the basis of a detected value of the second current, whether the second current is an overcurrent or not, wherein
a threshold for the first overcurrent determination unit to detect an overcurrent is lower than a threshold for the second overcurrent determination unit to detect an overcurrent,
the converter circuit stops operating in a case in which a determination result of either the first overcurrent determination unit or the second overcurrent determination unit indicates an overcurrent, and
the inverter circuit stops operating in the case in which the determination result of either the first overcurrent determination unit or the second overcurrent determination unit indicates an overcurrent.