Motor drive apparatus

Details Motor drive apparatus Motor drive apparatus

1982-01-22

1984-03-20

Truhe, J. V.

Electricity: motive power systems

Motor-reversing

H02P 122

Patent

active

044383789

ABSTRACT:
A reversible motor drive circuit for driving a motor in a first direction and thereafter driving the motor in a second direction opposite to said first direction. The circuit includes a first flip-flop having cross-coupled 1st and 2nd PNP transistors. The emitters of 1st and 2nd transistors are adapted to be coupled via a power switch to a power supply. The collectors of 1st and 2nd transistors are respectively coupled to opposite terminals of a DC reversible motor which are respectively coupled to the collectors of 3rd and 4th NPN transistors. The base of 3rd transistor is coupled to the collector of 4th transistor via an RC circuit having a first time constant. The base of 4th transistor is coupled to the collector of 3rd transistor via an RC circuit having a second time constant. The RC circuits and 3rd and 4th transistors form a second flip-flop coupled to the first flip-flop and the motor, wherein the first time constant is larger than the second time constant.

REFERENCES:
patent: 3229181 (1962-08-01), Evans
patent: 4275340 (1981-06-01), Schleupen
patent: 4338552 (1982-07-01), Pilz et al.

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