| 摘要 |
PURPOSE:To correct an unbalance between the positive half-wave time and the negative half-wave time of a power source by composing positive and negative charging/discharging circuit with diodes connected in reverse direction to each other. CONSTITUTION:When a power source is positive half-wave, a trigger capacitor 3 is charged through a resistor 9a and a diode 10a, and when the charged voltage arrives at the threshold voltage of a trigger element 4, a bidirectional thyristor 5 is triggered, and a motor 1 is started. Similarly, at negative half-wave time, the capacitor 3 is charged through a resistor 9b and a diode 10b. Thus, the charging time constants of the positive and negative half-wave times can be separately set, and an unbalance between the positive half-wave time and the negative half- wave time of a power source can be corrected. |
