| US 7,365,998 B2 | ||
| Unregulated isolated DC/DC converter with ripple control | ||
| Pavan Kumar, Portland, Oreg. (US); and Annabelle Pratt, Hillsboro, Oreg. (US) | ||
| Assigned to Intel Corporation, Santa Clara, Calif. (US) | ||
| Filed on Sep. 30, 2005, as Appl. No. 11/241,740. | ||
| Prior Publication US 2007/0076450 A1, Apr. 05, 2007 | ||
| Int. Cl. H02J 1/02 (2006.01) | ||
| U.S. Cl. 363—39 [363/45; 363/46; 363/48; 363/89] | 6 Claims |
| 1. An apparatus, comprising:
an unregulated isolated DC/DC converter configured to receive an input signal and to provide an output signal; and
a ripple control circuit coupled to the unregulated isolated DC/DC converter, wherein the ripple control circuit is configured
to reduce an amount of low frequency ripple transferred to the output signal from the input signal, wherein the ripple control
circuit comprises:
a filter circuit coupled to the output signal and configured to pass a filtered signal having a low frequency ripple component;
a first summing circuit coupled to receive the filtered signal from the filter circuit and configured to subtract the filtered
signal from a first reference signal and provide an intermediate signal;
a compensator circuit coupled to receive the intermediate signal and configured to regulate a low frequency AC ripple content
in the intermediate signal and provide a compensated signal; and
a second summing circuit coupled between the compensator circuit and the unregulated isolated DC/DC converter and configured
to add the compensated signal to a second reference signal and provide a resulting control signal to the unregulated isolated
DC/DC converter.
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