Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1986-04-15
1988-03-22
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
123490, H01H 4700
Patent
active
047333260
ABSTRACT:
A protective arrangement for an electromagnetic load is disclosed. In this protective arrangement, the load and a control transistor form a series circuit from the battery voltage to ground and a series circuit of a free-wheeling transistor and a free-wheeling diode is connected in parallel with the load. By coupling the base of the free-wheeling transistor to ground, this transistor is made continuously conductive provided that the polarity of the supply voltage is correct, whereas, this free-wheeling transistor blocks if the supply voltage polarity is incorrect. This assures that none of the components is in danger of being destroyed in the event that the polarity of the supply voltage is incorrect.
REFERENCES:
patent: 3183412 (1965-05-01), Arends
patent: 3705333 (1972-12-01), Galetto et al.
patent: 4161306 (1979-07-01), Brune et al.
patent: 4618908 (1986-10-01), Anttila
Harsch Klaus
Kosak Wolfgang
Werner Peter
Hix L. T,.
Ottesen Walter
Porterfield David
Robert & Bosch GmbH
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