VOLTAGE POLARITY DETECTION FOR DCM/CCM BOUNDARY DETECTION IN DC/DC CONVERTERS
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United States of America Patent
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Oct 22, 2015
app pub date -
Nov 26, 2013
filing date -
Nov 27, 2012
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Abstract
There is described a circuit and a method of detecting a voltage polarity for the detection of a Continuous Conduction Mode to Discontinuous Conduction Mode boundary of a switched DC-DC converter. There is provided use of a dynamic current mirror to store in a first capacitor (C) a voltage representative of the conduction voltage (VDS(Φ1)) of the power switch, at the end of a conduction cycle of said power switch. Also, an auto-zero comparator is used to charge the output voltage of the dynamic current mirror into a second capacitor (C2), during the first phase of operation corresponding to a conduction cycle of the power switch, and to detect the polarity of the conduction voltage (VDS(t=TCLK)) of the power switch at the end of the first phase of operation of the DC-DC converter, by comparing the voltage stored in the second capacitor during the first phase of operation with the output voltage of the dynamic current mirror in a second phase of operation (Φ2) corresponding to a non-conduction cycle of the power switch.
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