Patent ID: 8855509

Claim:
A heating apparatus comprising: a heater including a first current path and a second current path; a switching unit configured to perform switching between a first operational state where the first current path is connected in series to the second current path and a second operational state where the first current path is connected in parallel to the second current path; a power control unit configured to control electric power supplied to the first and second current paths; and a voltage detection unit configured to detect a voltage value applied to the first or second current path, wherein the voltage detection unit is configured to detect a first period during which the voltage value of the first current path or the second current path exceeds a threshold voltage and a second period during which the power control unit supplies electric power to the first current path or the second current path, and the voltage detection unit is configured to detect whether electric power is excessively supplied to the heater based on a ratio of the second period to the first period.