Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1979-06-12
1980-12-23
Hix, L. T.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 13, 307130, 354127, H02H 322
Patent
active
042413699
ABSTRACT:
An electrical power supply for an electronic flash unit with a main capacitor charged by a current flowing from a direct-current source through an electrical power source switch to the main capacitor is disclosed. The electrical power source has a semi-conductor switch connected in the charge path to the main capacitor and a detector, arranged to detect whether or not an aerial discharge is produced between the contacts of said switch upon opening of the electrical power source switch, and, upon occurrence of a discharge, to produce a signal. The semi-conductor switch is opened in response to the signal to stop charging of the main capacitor immediately.
REFERENCES:
patent: 3569779 (1971-03-01), Luursema
patent: 3736466 (1973-05-01), Fox
patent: 4156565 (1979-05-01), Harrison
Canon Kabushiki Kaisha
Hix L. T,.
Schreyer S. D.
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