Motor drive units, motor systems, in-vehicle equipment, and vehicles

Abstract

To provide a motor drive device capable of reducing peripheral parts of a motor relay.SOLUTION: A motor drive device (10B) includes: first drivers (HGD1 to HGD3) configured to drive first switches (1H to 3H); second drivers (LGD1 to LGD3) configured to drive second switches (1L to 3L) connected in series to the first switches; and third drivers (RGD1 to RGD3) configured to output a drive signal that is higher by a specific voltage than a connection node voltage between the first switch and the second switch, with reference to the connection node voltage.SELECTED DRAWING: Figure 4

Claims

1. A motor drive device configured to drive a motor by controlling an inverter configured to drive a motor, which includes a first switch and a second switch connected in series with each other, A first driver configured to drive the first switch, A second driver configured to drive the second switch, A third driver is configured to output a drive signal that is a constant voltage higher than the connection node voltage, with reference to the connection node voltage between the first switch and the second switch. A boost circuit configured to boost a first voltage to a second voltage, A clamp circuit that operates using the second voltage and is configured to clamp the difference between the connection node voltage and the drive signal to the constant voltage, It has, The third driver is configured to drive a motor relay, whose first end is connected to the connection node between the first switch and the second switch and whose second end is connected to the motor, using the drive signal. The clamp circuit comprises a diode, a Zener diode, and a MOSFET, and the constant voltage is determined by the forward voltage of the diode, the Zener voltage of the Zener diode, and the threshold voltage of the MOSFET, in a motor drive device.

2. The motor drive device according to claim 1, further comprising a first terminal connected to the output terminal of the third driver.

3. A second terminal connected to the output terminal of the first driver, The third terminal connected to the output terminal of the second driver, The motor drive device according to claim 2, further comprising a fourth terminal configured to receive the connection node voltage.

4. A motor drive device according to any one of claims 1 to 3, The inverter and, The motor and, The motor relay and, A motor system having the following features.

5. An in-vehicle device having the motor system described in claim 4.

6. A vehicle having the in-vehicle equipment described in claim 5.

Images