| 摘要 |
PURPOSE:To enable to operate a heating body in wireless and improve the handleability thereof by a method wherein a control circuit section is provided on the main frame of the foot warmer in the wooden frame and a series resonance device, operating the control circuit section, is provided on a table board put on the main frame. CONSTITUTION:The main body 16 of the wooden frame is provided with a first oscillator 1, a detector 2 detecting the signal of an operating section, an amplifier 3, a detector 4, a comparator 5 and the second oscillator 6. The second oscillator 6 is connected to a waveform shaper 8 through an integrator 7 and the signal therefrom is fed back to the first oscillator 1 to keep the frequency of oscillation in constant while it is impressed to a temperature detector 9 and inputted into the control circuit 10 for the heating body 11. On the other hand, the table board 17 is provided with an inductance 14 and a variable capacitance 15, which are constituting the series resonance device, to enable to control said control circuit unit. Both of the main frame 16 and the table board 17 are connected in wireless through a floating capacity component between respective electrode plates 12, 13. |
