Electric power conversion systems – Current conversion – Having plural converters for single conversion
Reexamination Certificate
2009-02-02
2011-12-13
Patel, Rajnikant (Department: 2838)
Electric power conversion systems
Current conversion
Having plural converters for single conversion
C363S087000, C323S282000, C700S297000
Reexamination Certificate
active
08077490
ABSTRACT:
Limit-cycle oscillation (LCO) generation by altering a digital transfer function of a feedback loop element provides a controllable method and apparatus for generating LCOs within a switch-mode power supply (SMPS). Measurements of the LCO characteristics can then be used to determine characteristics of the SMPS and/or determine proper compensation schemes. At least a zero error code of the feedback loop element is removed, causing the control value to oscillate between at least two values. Additional codes may be progressively removed until an LCO is detected, in order to ensure LCO generation with minimum disruption of SMPS operation. An analog-to-digital converter (ADC) that converts an output voltage or current to a control value may be used to generate an LCO by removing one or more output codes to alter its transfer function. Alternatively, a quantization step of the pulse-width modulator or other modulator may be increased to temporarily cause LCOs.
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Prodic Aleksandar
Zhao Zhenyu
Maxim Integrated Products Inc.
Mitch Harris, Attorney at Law, LLC
Patel Rajnikant
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