| 摘要 |
PURPOSE:To prevent instability generated in detecting overvoltage, by realizing hysteresis by a transistor circuit without using a relay contact. CONSTITUTION:A terminal 9 is connected to a terminal 10 through resistors 14, 15, 19, a Zener diode 13 and a resistor 22. On the other hand, the collector of a transistor 11 is connected to the terminal 10 through a resistor 16 while a base is connected to said terminal 9 through the connection point of the resistors 14, 15 and an emitter is connected to said terminal 9 through a resistor 17. Further, the base of a transistor 12 is connected to the connection point of the Zener doide 13 and the resistor 22, the emitter to the emitter of the transistor 11 and the collector to the connection point of the resistors 15, 19 through a relay 8, the terminal 10 and a resistor 18. In addition, the contact of the relay 8 is connected to terminals 26, 21.
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