Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1975-08-12
1977-04-05
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
323 22T, 361 78, H02H 320
Patent
active
040164594
ABSTRACT:
A cyclical ON-OFF control signal is generated with a predetermined duty cycle to energize a load through a semi-conductor switch; a trouble signal is generated, for example by sensing voltage across the load, across the switch, temperature or the like, and, when the trouble signal exceeds a certain threshold (as determined, for example, by comparing the trouble signal with a reference in a differentially connected operational amplifier), the ON-signal to gate the switch ON is interrupted; and an OFF cycle of the cyclical generating means is started; if the trouble signal disappears, the normal cyclical repetition rate continues. A minimum interruption time is, however, provided determined by the OFF period of the cyclical generator and/or circuit components.
REFERENCES:
patent: 3573598 (1971-04-01), Clark et al.
patent: 3587002 (1971-06-01), Ipswich
patent: 3675160 (1972-07-01), Staker
patent: 3702434 (1972-11-01), Ryan
patent: 3733540 (1973-05-01), Hawkins
patent: 3737756 (1973-06-01), Hasley et al.
patent: 3740668 (1973-06-01), Chopra
patent: 3839668 (1974-10-01), Black
patent: 3855520 (1974-12-01), Stich
patent: 3859586 (1975-01-01), Wadlington
patent: 3893043 (1975-07-01), Fukuoka
Miller J D
Robert Bosch G.m.b.H.
Salce Patrick R.
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