| 摘要 |
<p>A switching power supply system is disclosed for powering electrical equipment while minimizing disturbance to an AC power line source. The system includes first (Q1) and second (Q2) AC switches which are operated at alternate intervals with respect to each other to permit current to flow between the AC power line source and the load over intervals of the AC voltage cycle. An energy storage element (16) is included in an output filter and stores energy during intervals of the AC voltage cycle and releases the stored energy during the alternate intervals of the AC voltage cycle. By the disclosed switching power supply, the voltage applied to the load and the current flow between the source and the load are sinusoidal, have minimal energy in frequencies other than the fundamental AC power line frequency, have minimal harmonic distortion, result in a power factor close to unity, and are steady and non fluctuating.</p> |
