Hitachi Astemo Ltd.

Mitsuhiro Iwasaki

Masahiro Doi

Takeo Yamashita

Shinichirou Hida

Yuri Moizumi

Hitomi Aoyama

An electronic control device for power conversion having an integrated safety function and improved reliability includes: a power module for converting DC power into AC power and supply the AC power to a motor; a gate driver for controlling the power module; a microcontroller for controlling the gate driver; a power supply IC for supplying power to at least one of the gate driver and the microcontroller; a discharge circuit for discharging a high voltage supplied to the power module; and a sensor. The power supply IC includes a microcomputer abnormality detection circuit for detecting an abnormality of the microcontroller and a safety processing circuit for determining necessity of safety processing based on an output of at least one of the microcomputer abnormality detection circuit and the sensor and performs the safety processing. The safety processing circuit stops the motor or discharges a high voltage using the discharge circuit.

Electronic control device for power conversion, and power supply IC

Provided is an inverter device that detects abnormalities of a power device of the inverter device, and of a gate drive to be able to safely control the inverter device. The inverter device includes a gate voltage detection unitthat detects a gate voltage of the power device, and a drain voltage detection unitthat detects a drain voltage. A microcontrollercompares a gate drive signalwith a gate voltage detection signalto make a diagnosis and compares the gate drive signalwith a drain voltage detection signalto make a diagnosis, thereby making a diagnosis and detection of the gate voltage on normal. In addition, by generating a gate drive signal to the power device, from a gate voltage detection signal from a counter power device, a dead time is reduced.

Method and system for diagnosing abnormality of power device drive in inverter device

There is provided an electronic control device in which a microcomputer and a power source IC are mounted, the electronic control device having high reliability and being capable of performing fixation diagnosis of a safety control signal of the power source IC before activation of the microcomputer. The electronic control device includes a microcomputer, and a power source IC that communicates with the microcomputer. The power source IC includes a monitoring circuit that monitors the microcomputer, a safety processing circuit that outputs a safety control signal when the monitoring circuit determines an occurrence of an abnormality in the microcomputer, and a diagnosis circuit that diagnoses whether or not the safety control signal has a fixation failure. The diagnosis circuit detects whether or not the fixation failure has occurred, based on states of the safety control signal before and after the safety control signal is activated after activation of a power source.

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Hitachinaka, Japan

Mitsuhiro Iwasaki