Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Tomokazu Furuno

Shinichi Kuroshima

Katsuyuki Tabata

Masayoshi Igarashi

Ayako Iwanaga

A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.

PWM motor drive device

During PWM control in which an actuator () is connected between the output terminals of a bridge circuit made up of switching elements () and power is applied to the actuator () with signals GU, GL, GU and GL, driving timing signals are generated with a time interval (dead time) during which the switching elements () and the switching elements () are simultaneously turned off, and the actuator () is driven so as to have no overlapping dead time between a pair of half-bridge circuits, achieving response even with a differential input PWM signal (S-S) having a small time difference.

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Osaka, Japan

Tomokazu Furuno