| 摘要 |
The present invention relates to an improved PCB plate circuit mounted in a thermotherapy device used for providing heat fomentation and hot massage effects. The PCB plate circuit according to the present invention comprises a main controller for detecting an overheat state of the PCB plate. The main controller includes two separate lines, i.e. a control signal line for transferring a normal control signal and a clock signal line for transferring a clock signal, and the control signal line and the clock signal line are connected to a safety controller. The safety controller comprises a multivibrator connected to the clock signal line, a multiline for transferring a signal that is generated by the multivibrator and an AND gate for conducting an AND operation on input signals from the multiline and the control signal line. Further, the safety controller is connected to a power supply that is turned on/off, under a control signal operated at the AND gate. |
