| US 7,602,623 B2 | ||
| Apparatus, system, and method for a low cost self-healing power supply | ||
| Chu T. Chung, Cary, N.C. (US); Cecil C. Dishman, Raleigh, N.C. (US); and Randhir S. Malik, Cary, N.C. (US) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Dec. 28, 2007, as Appl. No. 11/966,450. | ||
| Prior Publication US 2009/0168472 A1, Jul. 02, 2009 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H02H 7/122 (2006.01); H02H 7/00 (2006.01) | ||
| U.S. Cl. 363—56.01 [361/18] | 20 Claims |
| 1. A apparatus to regulate voltage, the apparatus comprising:
a power supply that regulates a direct current (“DC”) regulated bus to maintain a regulated bus voltage under varying load
conditions, the power supply comprising
at least one pulse-width modulated stage, each pulse-width modulated stage comprising at least two switches connected in parallel,
each switch comprising a fuse connected in series with the switch that disconnects the switch in response to an over current
condition sufficient to open the fuse; and
a pulse-width modulator for each stage of the power supply that regulates a bus voltage controlled by the stage by sensing
the controlled bus voltage and adjusting a switching duty cycle to regulate the controlled bus voltage to a target value,
wherein the pulse-width modulator for a stage provides a substantially identical switching duty cycle to each switch of the
stage, the switching duty cycle comprising a signal to control a switch on and then off for a portion of a switching period.
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