| 摘要 |
<p>PURPOSE:To execute the comfortable temperature setting of an electric blancket or the like automatically by connecting a serial circuit consisting of a peripheral temperature detecting thermistor and a resistor in parallel with a variable resistor for setting up temperature. CONSTITUTION:Current is supplied from an AC power supply to a heat generating body 9 connected between the 1st and 2nd connectors 5, 12 through a power supply switch 2. In the current supply control, the temperature of a heat generating wire 7 in said heat generating body 9 is detected by a heat sensitive body 20 connected to the 3rd connector 23, a switching TR32 is controlled together with the variable resistor for setting up the temperature and then a thyristor 13 is controlled to keep a fixed temperature. The serial circuit consisting of the thermistor 27 for detecting a peripheral temperature (room temperature) and the resistor 28 is connected to a serial circuit consisting of said temperature setting variable resistor 25 and a resistor 26 and said temperature controlling signal is obtained from the node between the thermistor 27 and the resistor 28. If the peripheral temperature is dropped, the temperature is corrected so that the control temperature of the heat generating wire 7 is increased, so that comfortable heating can be obtained.</p> |
