HEATING DEVICE USING PHOTODETECTOR TO DETECT TEMPERATURE AND METHOD FOR PROTECTING THE SAME

摘要

A heating device includes a housing having a flow channel, a heater disposed in the flow channel, an optical rod, a light guider and a photodetector. The optical rod has a transparent body, a first end portion, and a second end portion located inside the housing. The light guider is provided at the second end portion for guiding lights emitted by the heater toward the first end portion. The photodetector is located around the first end portion and faces the second end portion for indirectly receiving the lights emitted by the heater to the light guider through the transparent body. The temperature of the heater can be measured efficiently and timely by using the photodetector having a high responding speed, such that an overheat or damage of the heater can be prevented by controlling the heater based on the measured temperature.

主权项

1. A heating device comprising:
a housing provided at an inside thereof with a flow channel for flow of working fluid; a heater disposed in the flow channel; an optical rod having a transparent body, a first end portion, and a second end portion opposite to the first end portion and located inside the housing; a light guider provided at the second end portion of the optical rod and facing the heater for receiving lights emitted by the heater and guiding the lights toward the first end portion of the optical rod; and a photodetector located adjacent to the first end portion of the optical rod and facing the second end portion of the optical rod for indirectly receiving the lights emitted by the heater to the light guider through the transparent body of the optical rod.