| |
SERIES-RESONANT SINGLE-PHASE AC-TO-DC POWER SUPPLY WITH ACTIVE POWER FACTOR CONTROL
| [View]
[Download]
|
| Author(s) |
J. Ben Klaassens; Marinus P. N. van Wesenbeeck; Hian K. Lauw |
| Abstract |
The series-resonant converter is one of the major classes of electronic power converters which is extensively applied for DC-to-DC conversion. This technology transfers bulk energy efficiently through a series-resonant circuit in the direct path of the energy transfer. This resonant converter forms a high-frequency AC-link between the voltage sources connected to the input and output terminals. The high-frequency link is exploited for the application of a modulation process thus avoiding the use of bulky and expensive low-order harmonic filters. The achievable high pulse repetition frequency is rooted in the efficient turn-off mechanism of the semiconductor switches and does not compromise their reliability. The classical objective of an AC-to-DC converter is to control the (average) value of the output waveform (often the output voltage). The energy emanated from the source is adapted by passive filters, often a compromise between volume and effective use. A rectifier-filter network presents a major disadvantage: a power factor less than one. This is caused by distortion of the source current. The resolution of the high-frequency input current of the series-resonant converter introduces the possibility to control the waveform of the source current accurately. In combination with the accurate positioning of the high-frequency current pulses it is possible to influence the exchange of power with the source by the introduced method of active filtering. A power factor equal to one will lead to an optimal operation. However the zero-crossing of the AC source voltage introduces the necessity to store energy. Bulky low-frequency storage elements will increase the specific volume and weight of the converter while the exchange of energy with storage elements will decrease the overall efficiency. The energy stored in the resonant circuit is fundamentally too low to solve this problem. The stored energy in the output capacitor necessary to decrease the high-frequency ripple voltage is available for these purposes. To obtain the optimal conditions for the source-sided power factor a bipolar flow of energy has to be implemented. |
| Download |
| Filename: | Unnamed file |
| Filesize: | 655.2 KB |
|
| Type |
Members Only |
| Date |
Last modified 2021-02-22 by System |
| |
 |