| 摘要 |
<p>The SMPS operates at a reasonably high and inaudible frequency, while enjoying the same high efficiency as the 'Burst Mode' and 'Cycle-Skipping Mode' operations. A reverse-energy flow is introduced into the SMPS, which is used to shorten the time between successive forward-energy-transfer pulses, thereby raising the operating frequency to any desired value. In other words, what is proposed is to remove a small amount of energy from the output-reservoir capacitor and deposit this energy back at the input-reservoir capacitor. Since the transfer of energy via switching-mode converters is nearly lossless, this small amount of energy is simply recycled, moving from the output-reservoir capacitor to the input-reservoir capacitor, and vice-versa. As a result of the proper timing of the reverse-energy-transfer pulses to the input-reservoir capacitor, the proper average output voltage to the load is maintained, while the frequency of the output voltage waveform is increased above the audible range.</p> |
