| 摘要 |
A direct synchronous rectification system characterized by a reduction in the number of operational components as compared with conventional systems is disclosed. In one embodiment, the rectifier comprises a power switching module comprising six switches and six associated diodes. Each phase of the incoming three-phase signal is coupled by a first diode to a positive DC bus bar and by a second diode to a negative DC bus bar. The six switches are adapted to selectively establish a short-circuit path for current from the DC bus to the source of AC power. Control circuitry is provided to close each switch during at least a portion of each interval in which current is flowing through diode associated with that switch. A low-capacitance DC bus capacitor is disposed between the positive and negative DC bus bars.
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