Patent ID: 9269517
Filing Date: 2016-02-23
CPC Classification: H01H

Claim Text:
1. A heating apparatus comprising: a first heating element; a second heating element; a first relay controlling current through the first heating element; a second relay controlling current through the second heating element; a first relay control circuit controlling the first relay; a second relay control circuit controlling the second relay; a third, bus relay further controlling current through the first heating element and the second heating element; a third relay control circuit controlling the third, bus relay; an adhesion detecting circuit coupled to the first relay, the second relay, and the third, bus relay, the adhesion detecting circuit being configured to receive an output from the first control circuit, receive a second output from the second control circuit, receive a third output from the third control circuit, and provide an alarm signal based on the first output, the second output, and the third output.