| 摘要 |
<p>PURPOSE:To stabilize a system voltage by holding an output of an automatic power factor regulator at that time when the voltage becomes a preset value or larger. CONSTITUTION:An automatic voltage regulator 4 controls a field current in response to a deviation between a reference voltage Vref and a system voltage Vfb, output PFref of a power factor controller 2. When the system voltage becomes the set value or higher, the output signal of a voltage detector 6 or 7 is input to an analog amount holding circuit 3, which holds the output of the controller 2 at that time. Thereafter, when the system voltage is recovered within the set value, an automatic power factor regulating operation is again performed.</p> |
