Variable frequency drive circuit

Details Variable frequency drive circuit Variable frequency drive circuit

1987-01-12

1988-05-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 310319, 318118, 307633, 363 16, 363131, H01L 4108

Patent

active

047437898

ABSTRACT:
An AC power system for a resonant load. A pair of switching networks and blocking networks are provided to drive the load for half a cycle in a resonant manner to a high energy state, and then maintained in that high energy state for a predetermined period. Then the load is driven for half a cycle in a resonant manner to the opposite polarity high energy state, and maintained in that high energy state for the predetermined period. A controller adjustably controls the frequency of switching between the two high energy states and the length of the predetermined period, so that a desired frequency is obtained.

REFERENCES:
patent: 3152295 (1964-10-01), Schebler
patent: 3629726 (1971-12-01), Popescu
patent: 3651352 (1972-03-01), Puskas
patent: 3668486 (1972-06-01), Silver
patent: 3681626 (1972-08-01), Puskas
patent: 3975650 (1976-08-01), Payne
patent: 4109174 (1978-08-01), Hodgson
patent: 4141608 (1979-02-01), Breining
patent: 4264837 (1981-04-01), Gaboriaud
patent: 4551690 (1985-11-01), Quist
patent: 4554477 (1985-11-01), Ratcliff
patent: 4588917 (1986-05-01), Ratcliff
GE SCR Manual, Sixth Edition, 1979, pp. 354 to 356.

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