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EP0472971A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Piezoelectric driver using resonant energy transfer

Assignee: Pacesetter AB
•
Filing: 1991-08-07
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Granted: —
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Expires: 2011-08-07
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Abstract

Abstract A drive circuit (13) for use with a capacitive load (10) includes two transistors (18, 20) controlled by a drive voltage (22) and connected to the load (10) through an inductor (14). A supply voltage (16) is alternately connected and disconnected to the circuit (13) to achieve a resonant transfer of energy from the supply voltage (16). Energy stored in the load (10) is transferred to the inductor (14) and then back to the load (10), thereby reversing and augmenting the output voltage across the load (10) and providing an instantaneous output voltage many times the supply voltage. Diodes (24, 26) ensure that the current flows in the proper polarity through the transistors (18, 20). The output voltage across the load (10) is controlled by energy limiting means (30 - 44). <IMAGE>

Inventors

  • 👤 Herman Lee Renger

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 20:17
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/802; B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/023; B06B2201/00; B06B2201/50; B06B2201/55

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 171 words
A drive circuit for driving a capacitive load (10), the drive circuit (13) comprising: an inductive element (14) having a first terminal and a second terminal (27), connected at its first terminal in series with the capacitive load (10) and forming an L-C circuit having a resonant frequency; a supply voltage source (16) producing a voltage at a first potential +V with respect to a second reference potential; switching means (18 - 26) for alternately connecting the second terminal (27) of the inductive element (14) to the supply voltage source (16) for current flow through the inductive element (14) and then to the reference potential for current flow in the opposite direction at a predetermined frequency less than the resonant frequency of the L-C circuit, characterized by energy limiting means (30 - 44), connected to the L-C circuit, for responding to a predetermined voltage level in the L-C circuit by disconnecting the supply voltage source (16) from the L-C circuit and instead connecting the L-C circuit to the second reference potential.
Claim 2
Dependent Claim 145 words
A drive circuit as recited in claim 1, wherein the switching means (18 - 26) comprises: a first MOSFET (18) having a gate, a drain, and a source; a second MOSFET (20) having a gate, a drain, and a source; a first diode (24) connecting the drain of the first MOSFET (18) to the second terminal (27) of the inductive element (14); a second diode (26) connecting the drain of the second MOSFET (20) to the second terminal (27) of the inductive element (14); and drive means (22), connected to the gate of each MOSFET (18, 20) for producing a cyclic drive voltage having a predetermined frequency; wherein the drive voltage controls the first MOSFET (18) and second MOSFET (20) such that the first MOSFET (18) is conducting when the second is not, and the second MOSFET (20) is conducting when the first is not.
Claim 3
Dependent Claim 97 words
A drive circuit as recited in claim 1 or 2, wherein the energy limiting means (30 - 44) comprises: a third MOSFET (36) having a gate, a drain, and a source, connected at its gate to the drive means (22) and at its source to the reference potential; a third diode (38) connecting the drain of the third MOSFET (36) to the second terminal (27) of the inductive element (14); and control means (34), connected to the L-C circuit, for responding to a predetermined voltage level in the L-C circuit to turn off the second MOSFET (20).

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