Crack detector for heated glass panel

G - Physics – 01 – R

Patent

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324/58.3

G01R 31/02 (2006.01) H02H 5/10 (2006.01) H05B 3/26 (2006.01) H05B 3/86 (2006.01)

Patent

CA 1283705

CRACK DETECTOR FOR HEATED GLASS PANEL Abstract of Disclosure An improvement is provided for an electrically heated glass panel of the type here a resistive film is disposed on the panel and is connected between and along the length of a pair of spaced bus bars each of which is terminated in a respective voltage input terminal and where one of the bus bars include a connector section to which the resistive film is not connected extending from the input terminal of the bus bar to a junction point on the bus bar beyond which the resistive film is connected to the bus bar. A sensor conductor is disposed on the glass panel and connected from at or beyond the junction point on the one bus bar to a sensor terminal and extends generally adjacent to the connector section of the bus bar Prior to applying a high voltage across the input terminals of the bus bars to energize the resistive film when it is desired to heat the glass panel, a low voltage incapable of producing an arc across any break in the connector section of the one bus bar is applied to the input terminal of such bus bar. The power supply is disabled in response to the presence of a predetermined voltage difference between the sensor terminal and the input terminal of th one bus bar indicating the presence of a break in the connector section of the bus bar so as to prevent the development of an arc across the break.

577741

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