| 摘要 |
PURPOSE:To prevent malfunction of a load circuit or destruction of components by detecting a prescribed amount of fluctuation of a power supply voltage fed to a connector due to improper contact to interrupt power to the load circuit. CONSTITUTION:When an input voltage rises between input terminals T11, T22, and the voltage reaches an operating start voltage VCCR, a transistor (TR)1 is actuated and a TRTR3 is turned on. On the other hand, a base current of the TR TR1 flows through a Zener diode ZD, but since a base current of the TR TR1 is fed via a resistor r2 when the TR TR2 starts its operation, the TR TR2 is turned on momentarily while being not affected by the leading characteristic of the ZD. On the other hand, the voltage between the terminals T1 and T2 is fluctuated and reaches an unstable voltage, the TR TR1, 2 are turned off and no voltage is fed to output terminals T3, T4. When the input voltage rises again and reaches the operating start voltage VCCR, the TR TR1, 2 are turned on and power is fed to the load. |
