HEATER CONTROL DEVICE, METHOD, AND PROGRAM

摘要

The present invention controls output power values finely and accurately. A heater control device to be applied to a heater unit which has at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized stat and a non-energized state of the PTC elements by being turned ON and OFF, pattern information (22) which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit (20) which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.