Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1997-01-30
1998-11-24
Riley, Shawn
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 98, 363132, 219665, H02H 7122
Patent
active
058416463
ABSTRACT:
In a device for the control of a circuit comprising a resonance inverter power supply for at least one load comprising an inductive component, the inverter power supply comprises at least two switches (Q.sub.1, Q.sub.2) mounted between the terminals of a DC voltage supply. The device has a current transformer (TR) comprising a primary winding (TRp) series-connected between the load and the common junction point between the switches (Q.sub.1, Q.sub.2), the freewheeling rectifiers (D.sub.1, D.sub.2) and the snubber capacitors (C.sub.1, C.sub.2); a first secondary winding (TR.sub.S1) connected between the emitter of one (Q.sub.1) of the two switches and the first terminal of a first DC supply (E.sub.1), the second supply terminal being connected to the base of the switch (Q.sub.1); a second secondary winding (TR.sub.S2) connected between the emitter of the other switch (Q.sub.2)and the first terminal of a second DC supply (E.sub.2), the second supply terminal being connected to the base of this other switch (Q.sub.2); a third secondary winding (TR.sub.S3)and a fourth secondary winding (TR.sub.S4) coupled respectively to the second and first secondary windings, the third and fourth secondary windings (TR.sub.S3, TR.sub.S4) being each connected between a ground and one of the power interfaces. The biases of the different windings are chosen in such a way that the opening of a switch takes place as soon as the associated switch-over decision signal is in a state representing the decision to open, and in such a way that the closing of a switch takes place when the associated switch-over decision signal is in a state representing the decision to close, and substantially when the current in the load has changed direction. Application to induction cooking devices.
REFERENCES:
patent: 4342076 (1982-07-01), Rosswurm et al.
patent: 4739465 (1988-04-01), Asano et al.
patent: 5027263 (1991-06-01), Harada et al.
patent: 5093771 (1992-03-01), Harvest
CEPEM
Riley Shawn
LandOfFree
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