Power supply over-voltage protection

Details Power supply over-voltage protection Power supply over-voltage protection

1995-05-05

1996-04-23

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 91, 363 61, 363 50, H02H 710

Patent

active

055109446

ABSTRACT:
A voltage doubler (2) having a series arrangement of two smoothing capacitors (C1,C2), is able to use less expensive smoothing capacitors (C1,C2) having a far lower rated voltage which is only slightly above the maximum voltage occurring during normal operation. To this end, a first and a second over-voltage prevention circuit (30,31) are coupled across the smoothing capacitors (C1,C2) of the voltage doubler (2) to protect the smoothing capacitors (C1,C2) against over-voltage if one of the smoothing capacitors (C1,C2) is short-circuited. The first and the second over-voltage prevention circuit (30,31 ) may both be an over-voltage detector, or an under-voltage detector each being coupled across one of the smoothing capacitors (C1,C2). It is also possible to combine an over-voltage detector coupled across one of the smoothing capacitors (C1,C2) to an under-voltage detector coupled across the same smoothing capacitor (C1,C2). The over-voltage detector prevents an over-voltage across said one smoothing capacitor (C1,C2) if the other smoothing capacitor (C1,C2) is short-circuited. The under-voltage detector detects a short circuit of the one smoothing capacitor (C1,C2) and thereby prevents an over-voltage across the other.

REFERENCES:
patent: 3893006 (1975-07-01), Algeri et al.
patent: 4780809 (1988-10-01), Chewak et al.
Sanken Electric Company, Ltd. publication SSE-17284E., no date.

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