| 摘要 |
The invention relates to a method of operating an electric heater having a resistive heating element (46) selectively coupled to an AC power supply (113) by a first pair of contacts (106) of a first relay (116) having opened and closed state conditions and by a second pair of contacts (108) of a second relay (118) having opened and closed state conditions and a switch (126) coupled in parallel to the second pair of contacts (108). The method includes changing a state condition of one of the first and second relays (116, 118) while maintaining the state condition of the other of the first and second relays (116, 118); upon the changing of the state condition, shunting the output of the second relay contacts (108) coupled with the resistive heating element (46) to the switch (126); and changing the state condition of the other of the first and second relays (116, 118) after completion of debounce for the one of the first and second relays (116, 118). |
