Shindengen Electric Manufacturing Company Limited

Tomohiro Tanabe

Kazuya Okabe

Daisuke Hagiwara

Takayuki Kondo

Seiichi Ando

Ken-ichi Iwao

Takuya Shoji

A control system includes a system power supply IC that operates based on a voltage outputted from a power supply circuit and supplies a voltage for operating a microcomputer to the microcomputer, monitors an abnormal condition of the microcomputer, and outputs a reset signal for resetting the microcomputer to the microcomputer when detecting an abnormal condition of the microcomputer. When detecting the abnormal condition of the microcomputer, the system power supply IC outputs a switch opening signal for forcibly turning off a switch, which, in response to the switch opening signal, stops supplying the voltage outputted from the power supply circuit to the motor driving circuit.

Control device including one microcomputer for controlling a motor vehicle which may immediately stop rotations of the motor when an abnormal condition occurs

The control device includes a control signal supply unit, a frequency changing unit, and a storage unit. The control signal supply unit generates a control signal, and supplies the generated control signal to the switching element. The storage unit stores a frequency table defining a change value of a frequency of the control signal. The frequency changing unit changes the frequency of the control signal every time a predetermined time period elapses, according to the change value defined in the frequency table.

Control device and program product for reducing a noise peak level

A temperature detecting apparatus detects a temperature of a detection target having a switch element. The temperature detecting apparatus includes a current detecting unit and a temperature estimating unit. The current detecting unit detects an output current from the detection target changing depending on an on/off operation of the switch element. The temperature estimating unit, on the basis of a current value detected by the current detecting unit, calculates a conduction loss of the switch element and a switching loss of the switch element to estimate the temperature of the detection target on the basis of the calculated conduction loss and the calculated switching loss.

Temperature detecting apparatus and computer program therefor

A fault detecting apparatus, to use an output current from a drive circuit as a current value detected by a current sensor, calculates a duty ratio of a control signal to be supplied to the drive circuit to define the duty ratio as a theoretical value of the duty ratio of the control signal. The fault detecting apparatus compares a duty ratio of a control signal actually supplied to the drive circuit with the theoretical value of the duty ratio of the control signal to determine whether the current sensor (fails on the basis of a comparison result.

Fault detecting apparatus and computer program therefor

A bidirectional DC-DC converter comprises: a first low voltage-side input/output terminal and a second low voltage-side input/output terminal; a low voltage-side rectifying circuit connected to the first low voltage-side input/output terminal and the second low voltage-side input/output terminal; a first high voltage-side input/output terminal and a second high voltage-side input/output terminal; a high voltage-side rectifying circuit connected to the first high voltage-side input/output terminal and the second high voltage-side input/output terminal; a transformer connected between the low voltage-side rectifying circuit and the high voltage-side rectifying circuit; and a controlling circuit that controls operations of switching elements in the low voltage-side rectifying circuit and the high voltage-side rectifying circuit. The controlling circuit achieves soft switching of a switching element in the high voltage-side rectifying circuit in a step-down operation.

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Saitama, Japan

Tomohiro Tanabe