| 摘要 |
A method of regulating the power effect in an electric load by pulse width regulation includes the steps of conducting a loading current, driving a load, through a transformer, and permitting such current to bring the transformer to a condition of magnetic saturation. The loading current is further conducted through a control circuit which receives a control current for switching the control circuit to the conductive, or live state from the transformer when the transformer is in the non-magnetically-saturated state. An external signal current of a certain duration is conducted through the transformer so that the control current is generated and the control circuit is switched to the conductive state at a first point in time. The signal current and loading current are conducted through the transformer until magnetic saturation occurs after the passage of a certain time interval, this time interval being shorter than the duration of the signal current. The signal current is of a magnitude which is sufficient to maintain the magnetically saturated state. For governing the power effect in the load, the relationship between the duration of the signal current and the time interval is modified. |
