| 摘要 |
A trigger control circuit for producing firing pulses for the thyristor of a power factor controller. The control circuit overcomes thyristor triggering problems involved with the current lag associated with controlling inductive loads and utilizes a phase difference signal, already present in the power factor controller, to derive a signal for inhibiting generation of a firing pulse until no load current is flowing from the preceding half cycle, thereby ensuring that the thyristor is triggered on during each half cycle. |
