Device for supplying energy to a heated window pane from an elec

Details Device for supplying energy to a heated window pane from an elec Device for supplying energy to a heated window pane from an elec

1990-10-26

1992-12-08

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219203, 219501, 219 1077, 219 10493, H05B 102

Patent

active

051700409

ABSTRACT:
The device for energizing a heating element of a window pane from a direct current network of a motor vehicle includes a converting device for converting the d.c. voltage of the direct current network into an alternating current voltage of a predetermined frequency and a resonant circuit connected to the output of the converting device having a Q-factor high enough to produce a low number of harmonics in operation. The resonant circuit has a resonant frequency corresponding to that of the alternating current voltage. The heating element is a part of a resistance of the resonant circuit. The converting device can include a control circuit for producing alternating control signals, a base driving circuit controlled by the control signals and having two outputs connected respectively to a base of a switching transistor. The device can also include a protecting circuit for picking up energy during opening of the respective switching transistors and returning the picked-up energy to the d.c. network.

REFERENCES:
patent: 3887781 (1975-06-01), Peters, Jr.
patent: 4277672 (1981-07-01), Jones
patent: 4357524 (1982-11-01), Apfelbeck et al.
patent: 4434358 (1984-02-01), Apfelbeck et al.
patent: 4620084 (1986-10-01), Cunningham et al.
patent: 4996405 (1991-02-01), Poumey et al.

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