| 摘要 |
A power supply operating at high frequencies for energizing a low-voltage lamp and the like loads, utilizes an autotransformer in series with a switching device. The series combination receives a voltage, greater than the voltage required for load operation, from commercial power mains. The load is tapped down upon the autotransformer, with the load current magnitude being controlled by variation of the percentage of time during which the switching device is in the conductive condition, during a power supply cycle interval; the conductive time is adjusted responsive to the current sensed to be flowing through the transformer and hence through the load.
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