| 摘要 |
A power supply comprises a rectification stage and a plurality of DC output stages (e.g. for charging batteries). The rectification stage comprises a PFC stage including a twelve pulse transformer generating two three phase AC waveforms phase shifted with respect to each other, two bridge rectifiers, each rectifying a respective three phase AC waveform, and two interphase transformers coupling the rectified DC outputs to provide a combined DC supply, and where each DC output stage has independent current and voltage control. The two interphase transformers coupling the first and second rectified DC outputs have a lower ripple than either of the first or second rectified DC outputs. The rectification stage is arranged to attenuate harmonics transmitted to the power source up to and including the eleventh harmonic of the power line frequency and to provide a total harmonic distortion, THD, of less than 5%. The power supply circuit may be used for a charger for high power charging, such as charging the batteries of multiple electric vehicles (EVs). |
