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Power control of PTC heating element using variable AC Cycles  

Gong, Jae-Woong (동아대학교)
Lee, Young-Joo (동아대학교)
Kim, Doo-Young (동아대학교)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.12, no.4, 2011 , pp. 355-361 More about this Journal
Abstract
The power control of the existing heating element has been using the On-Off control, phase control, and PWM control. In case of controlling power PTC heating element developed recently with the existing method, the temperature is unable to be precisely controlled or the harmful electromagnetic wave to human body is generated. In this paper, We suggest the power control of PTC heating cable using variable AC Cycles. This regards the AC cycle of N as the unit of the power control. It determines On-Off for each cycle. It is the AC power control method in which it arranges the on-cycle in N cycles in the random and it supplies the current continuously. At this time. the minimal electric power amount becomes 1/N. The maximum current amount becomes 1 and sets up the number of on cycles according to the set value and can control the electric power with the step of N consistently. In the PTC heating system, we show that proposed power control method is superior in the EMI and temperature control property using MATLAB simulation, experiments and measurements.
Keywords
PTC; Power control; Cycle; Heating element; Heating system; Electromagnetic waves;
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