Minebea Company, Limited

Toshikazu Koshiba

Shigemi Masuda

Yoshihiro Nakamura

Naoki Yamaguchi

A motor drive controller includes: a phase current detection circuit including: an RC network circuit in which a resistor and a capacitor are connected in series, the RC network circuit being configured to be connected in parallel with one or more coils of each phase of a motor; and a filter circuit that smooths a signal based on a voltage signal across the capacitor, wherein the phase current detection circuit generates a DC voltage signal that corresponds to a change in a value of a phase current flowing in the coils; a motor driver that drives the motor by applying a voltage to each phase of the motor; and a controller that receives the DC voltage signal from the phase current detection circuit and controls the motor driver based on the DC voltage signal.

Motor drive controller

There is provided a water leakage detection device including a water leakage detection unit which is configured to detect water leakage, a water leakage detection circuit unit which is configured to be driven by a DC voltage from a DC power source and apply an AC voltage for detecting water leakage to the water leakage detection unit, and is configured to determine whether water is leaking based on a detection signal of the water leakage detection unit. The water leakage detection unit includes an insulating transformer having a primary side and a secondary side, the second side being connected to the water leakage detection unit, and a water leakage detection determining unit which is connected to the primary side of the insulating transformer.

Water leakage detection device

There is provided a load driving apparatus including: a power converter circuit configured to convert electric power into direct current power; an output electric current detecting circuit configured to detect an output current flowing in the load; and a control circuit section configured to switch ON/OFF-operations of the load depending on an operation instruction information, to perform constant current control during a period of the ON-operation of the load, to output a first pulse signal to the power converter circuit when starting the constant current control, ON-duty of the first pulse signal being substantially same as that during a period of a most recent operation of the load performed immediately before, to perform constant voltage control during a period of the OFF-operation of the load based on an output voltage applied to the load, and to output a second pulse signal to the power converter circuit.

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Fukuroi, Japan

Toshikazu Koshiba