Electric power conversion systems – Current conversion – With starting arrangement
Patent
1984-03-22
1986-05-13
Salce, Patrick R.
Electric power conversion systems
Current conversion
With starting arrangement
323901, 363 96, H02M 5458
Patent
active
045890595
ABSTRACT:
A method of starting a current-fed inverter used as a high-frequency induction heating power supply and having a DC cut-off capacitor in the load circuit first supplies successive gate pulses which are spaced apart by small periods of time to a pair of thyristors of a power inverter unit until a turn-on current for the thyristors exceeds a latching current. When a voltage between output terminals of the power inverter unit reaches a predetermined thyristor reverse-biasing voltage, the successive gate pulses are no longer supplied to the thyristor pair. Then, successive gate pulses are supplied to a another pair of thyristors of the power inverter unit. The foregoing operation is repeated for successive thyristor pairs in a predetermined order until the period of oscillation of successive gate pulses supplied to the thyristor pairs is progressively shortened into conformity with a prescribed inverter oscillation period. With this method, no starter (with separate power supply) is required, and the prescribed inverter oscillation period can be quickly and reliably reached.
REFERENCES:
patent: 4385348 (1983-05-01), Wisner
patent: 4430697 (1984-02-01), Steinbruegge et al.
Neturen Co. Ltd.
Rebsch D. L.
Salce Patrick R.
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