| 摘要 |
PURPOSE:To enable accurate temperature indication and excessive temperature alarming with a small construction by checking drop or the like of the voltage of a power supply battery with a buzzer for alarming an abnormal temperature through a protective circuit according to the operation of a switch. CONSTITUTION:When a switch 11 connected to a contact A is turned to an intermediate point between on and off positions, a temperature detecting element 3 and a parallel resistor 13 froms a protective circuit. The output of a voltage comparator is turned to a low level to generate a buzz sound from an abnormal temperature alarming buzzer thereby confirming there is no voltage drop in a batery 12, disconnectin and the like. When the switch 11 is connected to contacts A and B, the outputs of voltage comparators 8 turn to a low level according to temperatures of elements 3 with changes in the resistance corresponding to the temperatures by way of a diode 15 t indicate the temperatures while the buzzer 9 emits an alarming sound with a comparator 14 when they exceed a specified level. Temperature indication or the like can be done accurately with a small construction having a simple protective circuit. |
