AUTOMATIC DOOR CONTROLLER

Japanese Patent JP3694721

B2

PROBLEM TO BE SOLVED: To extend the possible control time of a total control circuit as long as possible by operating a step-up or boost control circuit when power supply is interrupted, and braking a motor opening and closing a door while charging a boost capacitor with the use of a counter electromotive force of the motor.
SOLUTION: A total control circuit 4 controls the start-up, stop, rotational direction and speed of a motor M with the reception of a signal from a human body detector S. A power supply circuit 10 is provided with a boost capacitor and output control power Ec for the circuit 4 as well as drive power Em from a commertial power supply. When a power supply voltage detection circuit 9 detects the interruption of power supply, the circuit 4 outputs a braking voltage command Eb when a door is in a first area to brake the door instantaneously, and outputs a boost voltage command Ec when the door is in a second and a third areas to boost control the door, then charging the boost capacitor of the circuit 10 with the use of a counter electromotive force of the motor M to perform boosting for recover the drive voltage. Accordingly, the collision of door on a closing end by inertia is prevented, thereby giving no shock thereto.

Kenji Sakamoto
Yukihiko Okamura
Takashi Yoshida

JP17611597A

September 14, 2005

July 01, 1997

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MATSUSHITA ELECTRIC WORKS,LTD.

E05F15/10; E05F15/14; H02P3/00; (IPC1-7): E05F15/14; H02P3/00

JP9287349A
JP3043585A
JP8501611A
JP5340814A
JP6281497U

Hiroyuki Nakai

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