H-switch circuit with an overcurrent protection circuit

Details H-switch circuit with an overcurrent protection circuit H-switch circuit with an overcurrent protection circuit

1985-02-19

1986-12-30

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 33, 361 91, 318256, 318434, H02H 708

Patent

active

046333584

ABSTRACT:
A H-switch circuit is disclosed for rotationally driving a DC motor in a forward or reverse direction. The H-switch circuit comprises overcurrent-detecting circuits for four output transistors, which are respectively provided in order to detect the output transistor having an overcurrent, a circuit for generating an output signal upon detecting an overcurrent an integrating circuit controlled to be in a charge or discharge state according to the output signal representative of an overcurrent condition, and a circuit for turning off the output transistors when the integrating circuit is in the charge state and setting the integrating circuit to a discharge state. The charge and discharge operations of the integrating circuit are intermittently repeated until the overcurrent condition of the output transistor ends.

REFERENCES:
patent: 3332007 (1967-07-01), Livengood et al.
patent: 3757185 (1973-09-01), Brunner et al.
patent: 3846684 (1974-11-01), Jossic
patent: 3887844 (1975-06-01), Yoshida
patent: 3912981 (1975-10-01), Tsurushima
patent: 3919600 (1975-11-01), Sons
patent: 4006370 (1977-02-01), Erler
patent: 4322770 (1982-03-01), Sendelweck
patent: 4336562 (1982-06-01), Kotowski
patent: 4410935 (1983-10-01), Dang
patent: 4532567 (1985-07-01), Kade
IBM Technical Disclosure Bulletin, vol. 11, No. 2, Jul. 1968, pp. 89-90, New York, USA; A. K. Johnson, et al.

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