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1. 发明授权

US09941815B2 Power conversion apparatus with overcurrent simulating circuit 有权
公开(公告)号：US09941815B2
公开(公告)日：2018-04-10
申请号：US15325790
申请日：2015-06-29
申请人： Hitachi Automotive Systems, Ltd.
发明人： Shinichirou Hida , Hideyuki Sakamoto , Satoru Shigeta
IPC分类号： H02M7/537 , H02M1/08 , H02M1/32 , H02P29/024 , H02M1/00 , H02P27/08
CPC分类号： H02M7/537 , H02M1/08 , H02M1/32 , H02M7/53871 , H02M2001/0009 , H02P27/08 , H02P29/027
摘要： An object of the invention is to diagnose whether an overcurrent detecting function with respect to a power semiconductor element of a power conversion apparatus is normal. The power conversion apparatus of the invention is provided with IGBTs as the power semiconductor element which performs a switching operation to convert DC power supplied from a DC power source into AC power, an overcurrent detecting circuit, and an overcurrent simulating circuit. The IGBTs include an emitter sensing terminal which outputs a sense current according to a current flowing to an emitter electrode. The overcurrent detecting circuit detects the overcurrent flowing to the IGBTs on the basis of the sense current output from the emitter sensing terminal. The overcurrent simulating circuit outputs a simulation signal which simulates the overcurrent flowing to the IGBTs and toward the overcurrent detecting circuit.

2. 发明授权

US09744861B2 Power conversion device 有权
公开(公告)号：US09744861B2
公开(公告)日：2017-08-29
申请号：US15026479
申请日：2014-09-29
申请人： Hitachi Automotive Systems, Ltd.
发明人： Issei Toda , Koichi Ono , Shinichirou Hida
IPC分类号： H02P3/14 , B60L7/22 , H02P27/06 , H02M7/797 , B60L3/00 , B60L7/14 , B60L11/18 , B60L15/00 , H02P3/12 , B60L7/00 , H02P3/22 , H02M1/00
CPC分类号： B60L7/22 , B60L3/0069 , B60L7/003 , B60L7/14 , B60L11/1803 , B60L11/1864 , B60L15/007 , B60L2240/427 , B60L2240/525 , B60L2240/527 , E05Y2800/252 , E05Y2900/132 , H02M7/797 , H02M2001/0003 , H02P3/12 , H02P3/14 , H02P3/22 , H02P27/06 , Y02T10/644 , Y02T10/645 , Y02T10/7005 , Y02T10/7061
摘要： Even in the case in which an overvoltage is generated when a vehicle is in a non-operation state, the overvoltage can be suppressed. A power conversion device is connected to a three-phase motor mounted on a vehicle and includes an inverter circuit, a gate drive substrate, and a motor control substrate. In the motor control substrate, when the vehicle is in the non-operation state and a regenerative voltage applied from the three-phase motor to the inverter circuit becomes equal to or more than a predetermined threshold value, a power supply circuit supplies operation power to a control circuit. The control circuit starts when the operation power is supplied from the power supply circuit and outputs gate control signals to a driver circuit of the gate drive substrate, such that regenerative energy according to the regenerative voltage is consumed between the three-phase motor and the inverter circuit.

3. 发明授权

US10761144B2 Electronic device 有权
公开(公告)号：US10761144B2
公开(公告)日：2020-09-01
申请号：US16063809
申请日：2016-11-16
申请人： HITACHI AUTOMOTIVE SYSTEMS, LTD.
发明人： Shinichirou Hida
IPC分类号： G01R31/40
摘要： The number of ports of a microcomputer is increased to detect an abnormality of the power supply line in a case where a power supply line to a load circuit is increased in number by two or more systems. A first resistor R1 and a second resistor R2 are commonly connected to one end of a third resistor R3. The other end of the third resistor R3 is connected to a monitor port of the microcomputer 15 and is grounded through a fourth resistor R4. The microcomputer 15 determines a value of a monitor voltage input to the monitor port to determine an abnormality of a first power supply line L1 and a second power supply line L2. Specifically, it is determined whether the first power supply line L1 and the second power supply line L2 are short-circuited to a ground side, or a voltage is not supplied to the first power supply line L1 and the second power supply line L2 due to an open circuit.

4. 发明授权

US10514307B2 Fault detection apparatus 有权
公开(公告)号：US10514307B2
公开(公告)日：2019-12-24
申请号：US15540432
申请日：2015-12-16
申请人： Hitachi Automotive Systems, Ltd.
发明人： Shinichirou Hida , Satoru Shigeta
IPC分类号： G01K7/24 , G01K15/00 , G01K1/02 , G01K3/00 , G01K7/18
摘要： An object of the present invention is to enhance fault detection accuracy offered by a fault detection apparatus. A microcomputer reads a characteristic signal input thereto. The microcomputer compares a characteristic read from the characteristic signal with a previously established reference value. The previously established reference value represents a characteristic exhibited by a resistor that is connected with a temperature sensor circuit when the temperature sensor circuit operates normally. The microcomputer determines whether the characteristic exhibited by the resistor falls within a detection range. If it is determined that the characteristic falls with the detection range, the temperature sensor circuit is detected to be operational and information indicating that the temperature sensor circuit is operational is output to a host control apparatus. If it is determined that the detection range is exceeded, the temperature sensor circuit is detected to be faulty and information indicating that the temperature sensor circuit is faulty is output to the host control apparatus.

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