| 摘要 |
PROBLEM TO BE SOLVED: To provide a planar warmer equipped with a controller of small size and low cost by reducing a current capacity of a power source circuit part.SOLUTION: A planer warmer includes an AC power source 20, a heating element 21 in which a heater wire 24, a soluble body 23, and a temperature detecting wire 22 are provided as one body, a temperature detection part 25 for outputting a temperature signal voltage Va, a control part 27 for driving a power control element 28, a power source circuit part 31 which supplies control power source, a temperature signal wire drive part 37 for driving the temperature detection wire 22, and a temperature detecting current drive part 45 which allows current to flow the temperature detection part 25. The temperature detecting current drive part 45 causes current to flow the temperature detection part 25 only a part of the period in which the temperature detection wire 22 is in a conductive state, thereby an average current flowing the temperature detection part is reduced and a current capacity of the power source circuit part is reduced. Thus, a planer warmer equipped with a controller of small size and low cost is provided. |
