Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1994-02-22
1996-10-01
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
361118, H02H 710, H01C 712
Patent
active
055615961
ABSTRACT:
AC line stabilization circuitry is provided for high power factor loads for protecting bulkless AC/DC converters against lightning or other energy surges while simultaneously providing additional holdover capacity for AC line drop-out conditions. The stabilization circuitry diverts energy surges in the line caused by lightning or other conditions from being applied to the input of the converter by charging a capacitor, and the stabilization circuitry further provides enhanced holdover capacity during AC line drop-out conditions. The stabilization circuitry in accordance with the present invention utilizes simple sensing means operatively associated with a switch coupled to stabilization means for providing a stabilized input voltage to a bulkless AC/DC converter. The present invention further contemplates a simplified circuit including an isolating diode, a bulk capacitor and a reset network which enables the power factor to remain near unity during normal operation because the isolated bulk is peak charged and does not affect operation of the converter.
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Hemena William
Malik Randhir S.
International Business Machines - Corporation
Nguyen Matthew V.
Samodovitz Arthur J.
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