DC-DC converter with current control
First Claim
1. A direct current voltage boost converter comprising:
- a substantially static direct current voltage source;
an inductor;
a current-control switch coupled with, and between, the voltage source and the inductor;
a step-up switch coupled with the inductor;
a current sense device, coupled in series with the step-up switch and an electrical ground;
a capacitor coupled with, and between, the electrical ground, and the inductor and the step-up switch via a first device for controlling current flow direction;
a first control circuit coupled with the current sense device and the current-control switch, wherein the first control circuit opens and closes the current-control switch based, at least in part, on an electrical current conducted through the current sense device; and
a second control circuit coupled with the electrical load and the step-up switch, wherein the second control circuit opens and closes the step-up switch based, at least in part, on a voltage potential across the capacitor.
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Accused Products
Abstract
A direct current voltage converter in accordance with the invention includes a substantially static direct current voltage source, an inductor; a current-control switch coupled with, and between, the voltage source and the inductor, a step-up switch coupled with the inductor, and a current sense device coupled in series with the step-up switch and electrical ground. The converter also includes a capacitor for storing converted voltage that is coupled with, and between, electrical ground, and the inductor and the step-up switch through a device for controlling current flow direction. The converter further includes a first control circuit, which opens and closes the current-control switch based, at least in part, on an electrical current conducted through the current sense device, and a second control circuit, which opens and closes the step-up switch based, at least in part, on a voltage potential across the electrical load.
122 Citations
34 Claims
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1. A direct current voltage boost converter comprising:
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a substantially static direct current voltage source;
an inductor;
a current-control switch coupled with, and between, the voltage source and the inductor;
a step-up switch coupled with the inductor;
a current sense device, coupled in series with the step-up switch and an electrical ground;
a capacitor coupled with, and between, the electrical ground, and the inductor and the step-up switch via a first device for controlling current flow direction;
a first control circuit coupled with the current sense device and the current-control switch, wherein the first control circuit opens and closes the current-control switch based, at least in part, on an electrical current conducted through the current sense device; and
a second control circuit coupled with the electrical load and the step-up switch, wherein the second control circuit opens and closes the step-up switch based, at least in part, on a voltage potential across the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A circuit comprising:
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a first switching device;
a first device for controlling current flow direction coupled with the first switching device and an electrical ground;
a first electrical energy storage device coupled with the first switching device and the first device for controlling current flow direction;
a second switching device coupled with the first electrical storage device;
a current sense device coupled with the second switching device and the electrical ground;
a second device for controlling current flow direction coupled with the second switching device and the first electrical energy storage device;
a second electrical energy storage device coupled with the second device for controlling current flow direction and the electrical ground;
a first control circuit coupled with the current sense device and the first switching device, wherein the first control circuit opens and closes the first switching device based, at least in part, on an electrical current conducted through the current sense device; and
a second control circuit coupled with the second electrical energy storage device and the second switching device, wherein the second control circuit opens and closes the second switching device based, at least in part, on a voltage potential across the second electrical energy storage device. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A circuit comprising:
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a p-type field effect transistor (FET) current-control switch;
a first device for controlling current flow direction coupled with the current control switch and an electrical ground, wherein the first device for controlling current flow direction comprises one of a rectifying diode and an n-type FET;
an inductor coupled with the current-control switch and the first device for controlling current flow direction;
an n-type FET step-up switch coupled with the inductor;
a resistive current sense device coupled in series with the step-up switch and the electrical ground;
a second device for controlling current flow direction coupled with the step-up switch and the inductor, wherein the second device for controlling current flow direction comprises one of a rectifying diode and a p-type FET;
a capacitor coupled with the second device for controlling current flow direction and the electrical ground;
a first control circuit coupled with the current sense device and a gate of the current-control switch, wherein the first control circuit comprises one of a pulse-width modulation and a pulse-frequency modulation circuit that opens and closes the current-control switch based, at least in part, on a current being conducted through the current sense device; and
a second control circuit coupled with the capacitor and a gate of the step-up switch, wherein the second control circuit comprises one of a pulse-width modulation and a pulse-frequency modulation circuit, that opens and closes the step-up switch based, at least in part, on a voltage potential across the capacitor, wherein the first and second control circuits further comprise respective first and second startup circuits that initialize the circuit from a powered-off state, to a regulated, powered-on state when the circuit is coupled with a substantially static, direct current voltage source. - View Dependent Claims (28, 29)
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30. A direct current voltage boost converter comprising:
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a substantially static direct current voltage source;
an inductor;
an n-type field effect transistor (FET) step-up switch coupled with the inductor;
a p-type FET coupled with the step-up switch and the inductor;
a capacitor coupled with, and between, the electrical ground, and the inductor and the p-type FET; and
a control circuit coupled with the electrical load, the step-up switch and the p-type FET, wherein the control circuit regulates a voltage potential across the capacitor by opening and closing the step-up switch and the p-type FET one-hundred-eighty degrees out of phase based, at least in part, on the voltage potential across the capacitor. - View Dependent Claims (31, 32, 33)
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34. A direct current voltage buck converter comprising:
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a p-type field effect transistor (FET) current-control switch;
an n-type FET switching device coupled with the current-control switch;
a current sense resistor coupled with the switching device and an electrical ground;
an inductor coupled with the current-control switch and the first switching device;
a capacitor coupled with the inductor and the electrical ground; and
a control circuit coupled with the current sense resistor, the capacitor, and gates of the current-control switch and the switching device, wherein the control circuit comprises;
a voltage amplifier for comparing an output voltage potential of the converter with a reference voltage potential;
a comparator coupled with the current sense resistor so as to determine a current conducted through the current sense resistor;
a current amplifier coupled with output terminals of the voltage amplifier and the comparator, and a pulse-width-modulated (PWM) circuit coupled with an output terminal of the current amplifier, wherein a binary output signal of the PWM circuit is used to control the p-type FET and the n-type FET during operation of the buck converter.
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Specification