DC/DC converter having improved regulation
First Claim
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1. In a switching mode converter having a switching transistor and an inductor, a discontinuous mode control circuit comprising:
- a discontinuity detector coupled to the inductor that detects when the converter enters the discontinuous mode to generate a TRIP signal, the discontinuity detector determining the portion of a cycle of the switching transistor during which the converter is in discontinuous mode; and
a feedback controller coupled to an output of the converter and to the discontinuity detector, which alters a feedback control signal of the converter responsive to the determined portion of the cycle of the switching transistor during which the converter is in discontinuous mode; and
further comprising a freewheeling diode coupled to the inductor to discharge magnetic field energy stored in the inductor when the switching transistor shuts off; and
wherein the discontinuity detector comprises a comparator coupled across the freewheeling diode and detecting when voltage across the diode is an appropriate polarity for reverse current flow to generate the TRIP signal.
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Abstract
A switching mode converter, having a switching transistor and an inductor, has a discontinuity detector coupled to the inductor which detects when the converter enters the discontinuous mode. The discontinuity detector determines the portion of the cycle of the switching transistor in which the converter is in the discontinuous mode. A feedback controller is coupled to the output of the converter and to the discontinuity detector which alters a feedback control signal of the converter.
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Citations
13 Claims
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1. In a switching mode converter having a switching transistor and an inductor, a discontinuous mode control circuit comprising:
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a discontinuity detector coupled to the inductor that detects when the converter enters the discontinuous mode to generate a TRIP signal, the discontinuity detector determining the portion of a cycle of the switching transistor during which the converter is in discontinuous mode; and a feedback controller coupled to an output of the converter and to the discontinuity detector, which alters a feedback control signal of the converter responsive to the determined portion of the cycle of the switching transistor during which the converter is in discontinuous mode; and further comprising a freewheeling diode coupled to the inductor to discharge magnetic field energy stored in the inductor when the switching transistor shuts off; and
wherein the discontinuity detector comprises a comparator coupled across the freewheeling diode and detecting when voltage across the diode is an appropriate polarity for reverse current flow to generate the TRIP signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification