公开(公告)号：US20130277138A1

公开(公告)日：2013-10-24

申请号：US13860046

申请日：2013-04-10

Applicant: DENSO CORPORATION

Inventor： Kanta ARAI ,  Toshihisa YAMAMOTO

IPC: H02H7/08 ,  B62D5/04

CPC classification number: H02H7/0833 ,  B62D5/04 ,  B62D5/046 ,  B62D5/0481

Abstract: A motor drive apparatus includes a back EMF detection element and a protection control circuit. When a voltage detected by the back EMF detection element exceeds a threshold voltage of a Zener diode, a voltage signal is applied to a sensing gate through a detection signal line to sequentially turn on switching element of the low-side arm. A current caused by the back EMF applied to a drive circuit flows to the ground through the switching element of the low-side arm in an on-state. Thus a braking torque is applied to a motor, which is driven to rotate by an external force, and hence the back EMF is reduced. Switching elements in the drive circuit are thus protected from the excessive voltage.

Abstract translation: 电动机驱动装置包括反电动势检测元件和保护控制电路。 当由反电动势检测元件检测到的电压超过齐纳二极管的阈值电压时，通过检测信号线将电压信号施加到感测门，以依次打开低侧臂的开关元件。 由施加到驱动电路的反电动势引起的电流在接通状态下通过低侧臂的开关元件流到地面。 因此，制动转矩被施加到由外力驱动旋转的电动机，因此减小了反电动势。 因此，驱动电路中的开关元件被保护免受过电压的影响。

公开(公告)号：US20130257328A1

公开(公告)日：2013-10-03

申请号：US13855309

申请日：2013-04-02

Applicant: DENSO CORPORATION

Inventor： Kanta ARAI ,  Hideki KABUNE ,  Yasuhiko MUKAI

IPC: H02P29/02

CPC classification number: H02P29/022 ,  H02P25/22 ,  H02P29/0241 ,  H02P29/028 ,  H02P29/032

Abstract: When a failure detection part detects a failure in an inverter circuit in a first power supply system, a drive control part stops the inverter circuit from driving a motor. An on/off control part turns off a first power supply relay of a power supply on/off part. Under a state that the inverter circuit stops a motor driving operation, a first coil set of the motor generates an induced voltage by rotation caused by an external force. The induced voltage is regenerated to a battery from the inverter circuit through a second power supply relay and a parasitic diode of the first power supply relay. Thus, circuit elements in the power supply system, which is failing, are protected from breaking down.

Abstract translation: 当故障检测部分检测到第一电源系统中的逆变器电路中的故障时，驱动控制部分停止逆变器电路驱动电动机。 开/关控制部分关闭电源开/关部分的第一电源继电器。 在逆变器电路停止电动机驱动动作的状态下，电动机的第一线圈组由外力产生旋转感应电压。 感应电压通过第二电源继电器和第一电源继电器的寄生二极管从逆变器电路再生成电池。 因此，电源系统中的电路元件故障不受破坏。