US 7,612,541 B1Granted

Charge-pump voltage converter

AssigneeSandia Corporation

InventorsJohn P. Brainard, Todd R. Christenson

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Abstract

A charge-pump voltage converter for converting a low voltage provided by a low-voltage source to a higher voltage. Charge is inductively generated on a transfer rotor electrode during its transit past an inductor stator electrode and subsequently transferred by the rotating rotor to a collector stator electrode for storage or use. Repetition of the charge transfer process leads to a build-up of voltage on a charge-receiving device. Connection of multiple charge-pump voltage converters in series can generate higher voltages, and connection of multiple charge-pump voltage converters in parallel can generate higher currents. Microelectromechanical (MEMS) embodiments of this invention provide a small and compact high-voltage (several hundred V) voltage source starting with a few-V initial voltage source. The microscale size of many embodiments of this invention make it ideally suited for MEMS- and other micro-applications where integration of the voltage or charge source in a small package is highly desirable.

Claims3

Dependent claims

A charge-pump voltage converter comprising:

a stator comprising a rotor cavity, the rotor cavity having an insulating inner surface;
a rotor rotatably mounted in the rotor cavity, the rotor having an insulating circumferential surface and having means for connecting to a rotatable shaft;
at least one inductor electrode mounted on the insulating inner surface of the rotor cavity and having an inducing surface;
at least one transfer electrode mounted on the insulating circumferential surface of the rotor and having a transferring surface, a separation of the at least one inductor electrode and the at least one transfer electrode being suitable for induction of charge by the inductor electrode on the transfer electrode when a portion of the inducing surface is radially aligned with a portion of the transferring surface;
grounding means for connecting the at least one transfer electrode to a common for a portion of time while within an induction distance from the inductor electrode, wherein the transfer electrode has at least one contact-interruption means oriented out of a plane perpendicular to an axis of rotation of the rotor, the contact-interruption means serving to momentarily interrupt current flow between the transfer electrode and the grounding means as the transfer electrode rotates past the grounding means;
and
charge-transfer means for transferring charge from the transfer electrode to a charge-receiving means.

4 more elements

Dependencies are inferred from the claim text.