Pump drive circuit

Details Pump drive circuit Pump drive circuit

1982-10-28

1984-07-31

Goldberg, E. A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307140, 323242, 323300, 323324, 323326, 417 42, H02J 1300, G05F 500

Patent

active

044632690

ABSTRACT:
In a pump drive circuit, a power source voltage signal supplied to the pump is phase-controlled by a triac connected between the pump and the power source. The period of triggering the triac is determined by a time constant circuit of a UJT, a capacitor and a resistor circuit. The power source voltage signal has its frequency determined by a frequency discrimination circuit. The resistance value of the resistor circuit is selected in accordance with the result of the discrimination. Accordingly, the pump is applied with a voltage signal the phase of which is controlled in accordance with the power source frequency, and is thus driven to maintain a predetermined output.

REFERENCES:
patent: 4311956 (1982-01-01), Tolmie, Jr.
patent: 4370563 (1983-01-01), Vondling et al.
patent: 4382223 (1983-05-01), Hedges

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