Variable charge pumping DC-to-DC converter
First Claim
1. In conjunction with a charge pumping DC-to-DC converter including a plurality of capacitances, a power source having an output terminal and a reference terminal, and switches connecting each of the plurality of capacitances in parallel between the output terminal and the reference terminal of said power source in a first mode and coupling all of the plurality of capacitances in series to supply output power therefrom in a second mode of operation, a method of varying the output power comprising the steps of:
- maintaining the length of time of operation in the first and second modes substantially constant;
sensing the value of the output power; and
controlling the amount of current applied to the plurality of capacitances in the first mode in accordance with the value of the output power sensed.
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Accused Products
Abstract
Two storage capacitors connected in parallel with a constant current source in a charging mode and connected in series in a second mode to increase output voltage. A comparator senses the amplitude of the output voltage and controls the current supplied to the capacitors in the charging mode to increase or decrease the output voltage to coincide with a predetermined amplitude.
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Citations
7 Claims
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1. In conjunction with a charge pumping DC-to-DC converter including a plurality of capacitances, a power source having an output terminal and a reference terminal, and switches connecting each of the plurality of capacitances in parallel between the output terminal and the reference terminal of said power source in a first mode and coupling all of the plurality of capacitances in series to supply output power therefrom in a second mode of operation, a method of varying the output power comprising the steps of:
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maintaining the length of time of operation in the first and second modes substantially constant; sensing the value of the output power; and controlling the amount of current applied to the plurality of capacitances in the first mode in accordance with the value of the output power sensed. - View Dependent Claims (2, 3, 4, 5)
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6. In conjunction with a charge pumping DC-to-DC converter including a plurality of capacitances, a power source having an output terminal and a reference terminal, and switches connecting each of the plurality of capacitances in parallel between the output terminal and the reference terminal of said power source in a first mode and coupling all of the plurality of capacitances in series to supply output power therefrom in a second mode of operation, a method of varying the output power comprising the steps of:
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maintaining the length of time of operation in the first and second modes substantially constant; sensing the value of the output power; and disconnecting and connecting the power source to the switches to control the amount of current applied to the plurality of capacitances in the first mode in accordance with the value of the output power sensed. - View Dependent Claims (7)
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Specification