Electric power conversion systems – Current conversion – With starting arrangement
Patent
1992-04-21
1993-12-21
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
With starting arrangement
363 36, 363148, 323908, 318768, H02M 5293
Patent
active
052726169
ABSTRACT:
An apparatus for converting single phase input power to three phase output power supplied to a motor includes a pair of input lines, and a pair of DC bus lines, a pair of capacitors, a pair of diodes, and a pair of controlled switching devices which are each connected between the DC bus lines. One of the input lines is connected to the node between the capacitors and the other input line is connected to the node between the diodes. Two output lines are connected to the input line and a third output line is connected to the node between the two switching devices, with the three output lines being connected to a motor to supply three phase power to the motor. The switching devices are switched in a pulse width modulated manner to provide a voltage between the third output line and the other two output lines which provides the three phase power. During motor startup, at least one startup capacitor is switched in between one or both of the input lines and the output lines to provide startup torque for the motor. This capacitor is switched out after the motor has been started. A capacitor may also be switched in between the two input lines during startup to reduce the in-rush current on the input lines. Conversion of single phase to three phase power is obtained with only two active switching devices and a simple control strategy.
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Chen Chingchi
Divan Deepakraj M.
Novotny Donald W.
Voeltz Emanuel T.
Wisconsin Alumni Research Foundation
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