US 10,833,621 B2 · Drive control device for electric motor and drive control method for same

Abstract

A drive control device and a drive control method for electric motors are capable of detecting a leakage current in a multilayer wiring board without providing a current sensor. The drive control device has an inverter circuit mounted on the multilayer wiring board, and a shunt resistor for detecting a bus current in the inverter circuit. The upstream and downstream wiring portions of the inverter circuit are disposed facing each other in neighboring layers of the multilayer wiring board, with insulating layers interposed therebetween. The multilayer wiring board has a sensing pattern layer which guides, to the shunt resistor, the leakage current flowing from the upstream wiring portion to the downstream wiring portion, and the presence or absence of leakage current is determined based on the current flowing through the shunt resistor during the period in which the regenerative current is generated in the electric motor.

Claims19

Dependent claims

A drive control device for an electric motor, comprising:

an inverter circuit configured to drive the electric motor;
a shunt resistor for detecting a bus current in the inverter circuit;
a multilayer wiring board on which the inverter circuit and the shunt resistor are mounted;
an upstream wiring portion and a downstream wiring portion of the inverter circuit disposed facing each other in neighboring layers of the multilayer wiring board, the neighboring layers each having interposed therebetween an insulating layer;
a sensing pattern layer that is provided on the multilayer wiring board, and that guides, to the shunt resistor, a leakage current flowing from the upstream wiring portion to the downstream wiring portion;
and
a control unit configured to input a Pulse Width Modulation (PWM) signal to the inverter circuit to perform control, and to determine a presence or an absence of the leakage current based on a current flowing through the shunt resistor during a period in which a regenerative current is generated in the electric motor.

4 more elements

A drive control method for an electric motor, comprising an inverter circuit configured to drive the electric motor;

a shunt resistor for detecting a bus current in the inverter circuit;
a multilayer wiring board on which the inverter circuit and the shunt resistor are mounted;
an upstream wiring portion and a downstream wiring portion of the inverter circuit disposed facing each other in neighboring layers of the multilayer wiring board, the neighboring layers each having interposed therebetween an insulating layer;
a sensing pattern layer that is provided on the multilayer wiring board, and that guides, to the shunt resistor, a leakage current flowing from the upstream wiring portion to the downstream wiring portion;
and a control unit configured to drive the electric motor, the method comprising the steps of:
inputting and controlling a Pulse Width Modulation (PWM) signal from the control unit to the inverter circuit to drive the electric motor;
and
determining, by the control unit, a presence or an absence of the leakage current based on a current flowing through the shunt resistor during a period in which a regenerative current is generated in the electric motor.

5 more elements

Dependencies are inferred from the claim text.

Drive control device for electric motor and drive control method for same

Life of this patent

Drive control device for electric motor and drive control method for same

Life of this patent

Abstract

Claims19