Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1978-07-14
1979-09-04
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361159, 361194, H01H 4732
Patent
active
041670302
ABSTRACT:
A protective circuit for an electronic switching amplifier is controlled by an operating switch, the amplifier serving to turn on an electromagnet with timed pulses during its operating interval. The electromagnet may electromagnetically actuate positioning and actuating elements on sewing machines and the like, with the timed pulses. A cutoff voltage limiting circuit is connected on one side between the electromagnet and the switching amplifier. A free-running diode is connected in parallel with the electromagnet through an electronic switch as an additional cutoff voltage limiting circuit. The electronic switch is caused to conduct by the switching amplifier during the operating interval, at least during the decay of the timing pulses. The electronic switch is blocked when the operating interval is terminated by the operating switch. The cutoff voltage limiting circuit is designed to conduct when electronic switch is blocked.
REFERENCES:
patent: 3211117 (1965-10-01), Spekhermann et al.
patent: 3579052 (1971-05-01), Kato et. al.
patent: 3790862 (1974-02-01), Kampf et al.
patent: 3864608 (1975-02-01), Normile et al.
patent: 3870931 (1975-03-01), Myers
patent: 3909681 (1975-09-01), Campari et al.
patent: 4041546 (1977-08-01), Stewart
patent: 4142684 (1979-03-01), Schweitzer
Frankl & Kirchner GmbH & Co. KG
Moose Jr. Harry E.
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