Guard circuit for the protection of capacitive loads

Details Guard circuit for the protection of capacitive loads Guard circuit for the protection of capacitive loads

1989-04-21

1990-06-19

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 79, 361 91, 361 93, H02H 300

Patent

active

049358367

ABSTRACT:
The DIN Standard VDE 160/01.86 involves specific requirements as far as the dielectric strength of electronic devices is concerned which are intended for operation at high-voltage networks. A guard circuit for the protection of capacitive loads is described. In this system, a current detector means is provided to detect the current flowing into the load and to emit a first blocking signal at least when the amount of the detected current exceeds a preset maximum value. A voltage detector means is provided to detect the voltage in the supply network and to emit a second blocking signal when the amount of the detected voltage exceeds a preset maximum value. A controllable switching means is provided which is so designed and in such controlled communication with the current and voltage detector means that the load will be isolated from the supply network as soon as at least one of the two blocking signals is applied.

REFERENCES:
patent: 4414598 (1983-11-01), Nowell
patent: 4420787 (1983-12-01), Tibbits et al.
patent: 4703387 (1987-10-01), Miller
patent: 4719531 (1988-01-01), Okada et al.
Elektrotecknik German Technical Journal, Jun. 1977, pp. 14-19.
ITT Intermetall Company publication, Edition 1973/3, pp. 158, 159.

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