Title:
METHOD AND APPARATUS FOR DIRECT SYNCHRONOUS RECTIFICATION IN A PULSE-WIDTH MODULATED MOTOR CONTROLLER
Document Type and Number:
WIPO Patent Application WO2001071900
Kind Code:
A3
Abstract:
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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Inventors:
WOOD RICHARD D
Application Number:
PCT/US2001/008872
Publication Date:
January 31, 2002
Filing Date:
March 20, 2001
Export Citation:
Assignee:
BALDOR ELECTRIC CO (US)
International Classes:
H02M5/458; H02M7/219; H02M7/797; (IPC1-7): H02M7/797; H02M5/458; H02M7/219
Domestic Patent References:
| WO1999017435A1 | 1999-04-08 |
Foreign References:
| EP0590648A2 | 1994-04-06 | |||
| DE19617048C1 | 1997-07-24 |
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