Dc/dc converter with a protection circuit

Details Dc/dc converter with a protection circuit Dc/dc converter with a protection circuit

1997-11-24

1999-04-27

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 56, 363 22, H02M 710

Patent

active

058985808

ABSTRACT:
The invention is about a dc/dc converter (1) fitted with switching means (11, 12) having a drive electrode (13, 14) each drive electrode (13, 14) being connected to polarization means (49,50). The switching means are to switch on and off a current coming from a direct source of current 2 and circulating in windings (17, 18, 5) of transformers (6, 7) of the converter. The improvement according to the invention comprises a protection circuit 24 connected to means (44) for detecting the value of current circulating in one of the windings (4, 5, 15, 19, 23) of the transformers. Outputs (47, 48) of circuit 24 are connected to the drive electrode (13, 14) of switching means (11, 12). Protection circuit (24) may be a bistable circuit that will lower voltage at its outputs (47, 48) in a permanent way if detected current has been to high, thus switching off in a permanent way switching means (11, 12). The switching off is made in less than a working period of the switching means (11, 12) and prevent any damage to said switching means.

REFERENCES:
patent: 4293902 (1981-10-01), White
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4560851 (1985-12-01), Tsukamoto
patent: 4847746 (1989-07-01), Rilly et al.
patent: 5303137 (1994-04-01), Peterson
patent: 5321596 (1994-06-01), Hurst
patent: 5392206 (1995-02-01), Peterson et al.
patent: 5740021 (1998-04-01), Lecheler et al.

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