Electricity: motive power systems – Battery-fed motor systems
Patent
1978-06-15
1980-07-08
Rubinson, Gene Z.
Electricity: motive power systems
Battery-fed motor systems
318341, H02P 500
Patent
active
042119618
ABSTRACT:
A control circuit for controlling supply of current for electric motor has a chopper circuit connected with a battery in series. The chopper circuit is constructed with such as power transistors or power thyristors, and the ON-OFF operation thereof is controlled by a driving pulse. A command signal is produced at a movable tap of a potentiometer, across which a D-C control voltage from the battery is applied. In order to determine the duty and the control frequency of the chopper circuit, a duty controlling oscillator circuit is provided, which generates an output signal on the basis of the command signal from the potentiometer. The duty controlling oscillator circuit includes an integrator composed of an operational amplifier having a negative feedback of a condenser, to the -input terminal of which the command signal is applied. Another operational amplifier having a positive feedback of a resistor operates as a hysteresis comparator, to the +input terminal of which is applied the output from the integrator and to the -one of which a divided reference of the D-C control voltage. In response to the output signal from the hysteresis comparator, a driving pulse generator produces a driving pulse to the chopper circuit.
REFERENCES:
patent: 3223909 (1965-12-01), Sensing et al.
patent: 3500161 (1970-03-01), Domann et al.
patent: 3517290 (1970-06-01), Gunsser
patent: 3517292 (1970-06-01), Thiele
patent: 3597671 (1971-08-01), Adams
patent: 3855520 (1974-12-01), Stich
patent: 3982161 (1976-09-01), Grace
patent: 4066934 (1978-01-01), Waldorf et al.
patent: 4150324 (1979-04-01), Naito
Marumoto Katsuji
Omae Tsutomu
Hitachi , Ltd.
Rubinson Gene Z.
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