HEATING DEVICE FOR DETECTING STATE OF ADJUSTMENT PORTION THAT ADJUSTS PERIOD OF CONNECTION WITH ALTERNATING CURRENT SOURCE

摘要

In a heating device, a heater has first and second terminals. The first terminal is connectable to an alternating current source. The adjustment portion selectively establishes and disconnects a first connection between the second terminal and the alternating current source. The switching portion selectively establishes and disconnects a second connection between the heater and the alternating current source. The generating circuit has a third terminal connected to the alternating current source and a fourth terminal connected between the second terminal and the adjustment portion. The generating circuit generates a zero-cross signal of the alternating current source. The processor is configured to: adjust a connection period during which the adjustment portion establishes the first connection; detect a state of the adjustment portion in response to the zero-cross signal; and perform an error process when the detected state of the adjustment portion indicates that the adjustment portion cannot disconnect the first connection.

主权项

1. A heating device comprising:
a heater having a first terminal and a second terminal, the first terminal being configured to be connectable to one terminal of an alternating current source; an adjustment portion configured to selectively establish and disconnect a first connection between the second terminal and another terminal of the alternating current source; a switching portion configured to selectively establish and disconnect a second connection between the heater and the alternating current source; a generating circuit having a third terminal and a fourth terminal, the third terminal being connected to the one terminal of the alternating current source, the fourth terminal being connected between the second terminal and the adjustment portion, the generating circuit being configured to generate a zero-cross signal indicating a zero-cross timing concerning output of the alternating current source; and a processor configured to: adjust a connection period during which the adjustment portion establishes the first connection; detect a state of the adjustment portion in response to the zero-cross signal; and perform an error process when the detected state of the adjustment portion indicates that the adjustment portion cannot disconnect the first connection.