Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1990-06-11
1991-12-10
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219519, 219508, 219497, 219203, 322 8, H05B 102
Patent
active
050720988
ABSTRACT:
Electrical power for an electrically heated vehicle windshield is controlled by an arrangement utilizing a modified alternator coupled to the windshield heater via an autotransformer. In a high power mode, the vehicle battery is coupled to a center tap of the alternator, while in a normal power mode the vehicle battery is coupled to a conventional rectified output of the alternator. A microprocessor controlled silicon controlled rectifier bridge provides direct current to the windshield heater element by rectifying the output of the autotransformer. Additionally, a current sensor coupled to the heater element is utilized by the microprocessor to determine the electrical resistance of the heater element in order to take required diagnostic measures.
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Matthews Geoffrey S.
Pyko Jan S.
Yagley Martin G.
Calcaterra Mark P.
Chrysler Corporation
Paschall Mark H.
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