| 摘要 |
<p>To control the gating angles and hence the subsequent conduction angles of a complementary pair of alternately fired controllable electric valves, there is provided during intermittent intervals when neither valve is conducting a gating control signal which depends on the sum of a control signal indicative of a desired conduction angle, an on-time indicating signal indicative of the actual conduction angle of the last conducting valve, and an off-time indicating signal that varies with the duration of the non-conducting interval. Each time the gating control signal reaches a predetermined threshold level, the next to conduct valve is fired.</p> |
