Fault Detection Device For Inverter System
First Claim
1. A fault detection device for an inverter system, that detects a fault in the inverter system, the inverter system including an inverter circuit that converts input DC power into AC power and a motor that is driven by the inverter circuit,wherein, when a driving start signal of the inverter circuit is input, a test voltage applying unit applies a predetermined first test voltage to a current measuring unit that measures current flowing in the inverter circuit, and it is determined whether the current measuring unit has failed or not based on the applied first test voltage, andwherein a control unit applies a predetermined second test voltage to the inverter circuit and the motor, and it is determined whether the inverter circuit and a coil of the motor have failed or not based on the applied second test voltage,so that it is determined whether the current measuring unit has failed or not before the start of driving of the inverter system, and then it is determined whether the inverter circuit and the coil of the motor have failed or not.
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Accused Products
Abstract
To provide a fault detection device for an inverter system, that detects a fault in the inverter system including an inverter circuit 2 that converts DC power into AC power and a motor 5 driven thereby. When a driving start signal Sig1 of the inverter circuit 2 is input, a test voltage applying unit 20 applies a predetermined first test voltage to a current measuring unit 10 that measures current flowing in the inverter circuit 2, and it is determined whether the current measuring unit 10 has failed, based on the first test voltage. A control unit 30 applies a predetermined second test voltage to the inverter circuit 2 and the motor 5, and it is determined whether the inverter circuit 2 and a motor coil have failed, based on the second test voltage.
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Citations
4 Claims
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1. A fault detection device for an inverter system, that detects a fault in the inverter system, the inverter system including an inverter circuit that converts input DC power into AC power and a motor that is driven by the inverter circuit,
wherein, when a driving start signal of the inverter circuit is input, a test voltage applying unit applies a predetermined first test voltage to a current measuring unit that measures current flowing in the inverter circuit, and it is determined whether the current measuring unit has failed or not based on the applied first test voltage, and wherein a control unit applies a predetermined second test voltage to the inverter circuit and the motor, and it is determined whether the inverter circuit and a coil of the motor have failed or not based on the applied second test voltage, so that it is determined whether the current measuring unit has failed or not before the start of driving of the inverter system, and then it is determined whether the inverter circuit and the coil of the motor have failed or not.
Specification