Controlling switch-Mode power conversion
First Claim
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1. A method of controlling, in a switching converter that is controlled by switch control pulses and that delivers power to a load, a transition between higher load and lower load modes, comprising:
- in a first operating phase when the load is above a first threshold, varying the output power by varying the width of the switch control pulses, andin a second operating phase when the load is below the first threshold, modulating periodic blanking pulses wherein each blanking pulse blanks a single switch control pulse and the frequency of the periodic blanking pulses increases to decrease output power.
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Abstract
In a switching converter that delivers power to a load, a transition between higher load and lower load modes is controlled by varying the width of switch control pulses in one operating phase and blanking individual pulses in another operating phase. Alternatively, in yet another operating phase the time interval between switch control pulses is varied and, at a given load condition, the time interval between successive pulses remains essentially constant.
44 Citations
13 Claims
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1. A method of controlling, in a switching converter that is controlled by switch control pulses and that delivers power to a load, a transition between higher load and lower load modes, comprising:
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in a first operating phase when the load is above a first threshold, varying the output power by varying the width of the switch control pulses, and in a second operating phase when the load is below the first threshold, modulating periodic blanking pulses wherein each blanking pulse blanks a single switch control pulse and the frequency of the periodic blanking pulses increases to decrease output power. - View Dependent Claims (2, 3, 4)
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5. A method of controlling, in a switching converter that is controlled by switch control pulses and that delivers power to a load, a transition between higher load and lower load modes, comprising:
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in a first operating phase, prior to the load falling to a first threshold, regulating the output of the converter by regulating the width of constant frequency switch control pulses, in a second operating phase, after the load falls below the first threshold, regulating the output of the converter by periodically blanking an individual switch control pulse at a varying rate, and in a third operating phase, after the load falls below a second threshold, regulating the output of the converter by varying the intervals between the leading edges of said pulses.
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6. A method of controlling the switching operation of a converter that is controlled by switch control pulses and that delivers power to a load, comprising:
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in a higher load mode, varying the widths of switch control pulses to accommodate variations in the load, and in a lower load mode, modulating periodic enabling pulses wherein each enabling pulse enables a single switch control pulse and the frequency of the enabling pulses decreases to decrease output power.
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7. Apparatus for controlling, in a switching converter that is controlled by switch control pulses and that delivers power to a load, a transition from higher load to lower load modes, comprising:
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a pulse width modulator for regulating the output power in a first operating phase; and pulse blanking circuitry for periodically blanking single ones of said switch control pulses in a second operating phase, the switch control pulses being blanked with increased frequency to decrease output power. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification