| 摘要 |
<p>PURPOSE:To prevent a semiconductor component, etc., from damaging by short- circuiting either cycle of a generated voltage when a peak voltage is raised due to disconnection of a battery, etc. CONSTITUTION:If a battery 15 is disconnected, a voltage at a point C at the output side of a thyristor 65 is raised, and a current flows through a resistor 71, a Zener diode 73, and a resistor 72. Thus, when a voltage generated at the resistor 72 exceeds the trigger voltage of a thyristor 75, a gate voltage is applied through a diode 74. Thus, the thyristor 75 is turned ON, and a charging terminal 2 is grounded in a positive cycle of a generated voltage. Accordingly, the voltage at the point C is lowered, and a peak voltage at a DC load 17 can be suppressed to a set voltage or lower to be determined by a Zener voltage V23.</p> |
