Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1997-10-14
1999-02-09
Hecker, Stuart N.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
323282, H02M 700
Patent
active
058702962
ABSTRACT:
Dual interleaved DC to DC switching circuits realizable in an integrated circuit form, capable of monitoring individual inductor current using only one current sense resistor and providing automatic duty cycle adjustment to keep the inductor currents in the interleaved DC to DC switching circuits balanced. The preferred embodiment includes a gain error amplifier, an integral error amplifier, and a differentiator error amplifier and circuits for controlling the nominal duty cycle, with the gain error amplifier, integral error amplifier and differentiator error amplifier being adjustable independently by external components. The circuit further includes a high speed load regulation circuit that momentarily overrides the control circuitry to take over control of the interleaved converters during sudden load changes, such control also being programmable. The circuit further includes a load variation circuit to target the output voltage of the circuit to an optimal value with load to better keep the output voltage within a targeted range in the event of major step changes in the load. The disclosed embodiment is for two interleaved buck converters, though the principles of the invention are applicable to interleaved step up converters and the interleaving of more than two converters.
REFERENCES:
patent: 4489370 (1984-12-01), Migliori
patent: 5583753 (1996-12-01), Takayama
patent: 5604669 (1997-02-01), Strong, III
patent: 5719491 (1998-02-01), Kolanko et al.
patent: 5764007 (1998-06-01), Jones
patent: 5781421 (1998-07-01), Steigerwald et al.
Hecker Stuart N.
Maxim Integrated Products Inc.
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