System and method for calibrating and driving piezoelectric transducers

• US 20090228229A1
• Filed: 03/04/2008
• Published: 09/10/2009
• Est. Priority Date: 03/04/2008
• Status: Abandoned Application

• Current Assignee: American Medical Innovations, LLC
• Original Assignee: American Medical Innovations, LLC
• Inventors: Trandafir, Titi
• Application Number:
  US12/075,608
• Publication Number:
  US 20090228229A1
• Time in Patent Office: Days
• US Class Current: 702/106
• CPC Class Codes: A61B 2017/00725 Calibration or performance testing
• CPC Class Codes: A61N 7/00 Ultrasound therapy lithotripsy A61B17/22, A61B17/225; massage using supersonic vibration A61H23/00 ; using ultrasound for introducing media into the body A61M37/0092
• CPC Class Codes: B06B 1/00 Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B06B 1/0238 of a single frequency, e.g. a sine-wave

Abstract

A system for calibrating and driving a piezo-electric transducer includes a voltage supply, a processor, an electrical signal switch, a Class F third order harmonic peaking blocking circuit segment enabling a drain voltage output having a time differential slope prior to signal passage through the harmonic peaking blocking circuit segment at turn-on of the switch, and wherein third order harmonics are rejected by the harmonic peaking blocking circuit, a programmable frequency oscillator in electrical communication with the processor and that drives the switch, wherein the processor programs the frequency oscillator to establish the operating frequency of the switch, and an inductor in parallel with a piezo-electric kinetic energy transducer that electrically represents a parallel resonant resistive-capacitive circuit segment that is configured to receive the oscillating signal input at the operating frequency and to produce kinetic energy output. A corresponding method of driving the transducer with the system is also disclosed.

Claims

1. A system for at least one of calibrating and driving a piezo-electric transducer comprising:

a voltage supply;

a processor;

an electrical signal switch in electrical communication with the voltage supply;

a Class F third order harmonic peaking blocking circuit segment in electrical communication with the voltage supply and with the electrical signal switch and configured to enable a drain voltage output having a time differential slope prior to signal passage through the harmonic peaking blocking circuit segment at turn-on of the switch, and wherein third order harmonics are rejected by the harmonic peaking blocking circuit;

a programmable frequency oscillator in electrical communication with the processor and that drives the switch, wherein the processor programs the frequency oscillator to establish the operating frequency of the switch; and

an inductor in electrical communication with the harmonic frequency blocking circuit segment wherein the inductor is disposed to enable electrical connection in parallel with a piezo-electric kinetic energy transducer, the transducer electrically representing a parallel resonant resistive-capacitive circuit segment that is configured to receive the oscillating signal input at the operating frequency and to produce kinetic energy output.

2. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 1, further comprising:

a piezoelectric transducer electrically connected with the inductor,

wherein magnitude of the time differential slope and magnitude of the drain voltage prior to switch turn on are indicative of transducer electrical operating efficiency, and wherein

the processor measures, at at least a first operating frequency established via the programmable frequency oscillator, at least one of the drain voltage output and time slope differential prior to switch turn-on.

3. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 2,

wherein the processor measures, at at least a second operating frequency established via the programmable frequency oscillator, at least one of the drain voltage output and time slope differential prior to switch turn-on,

wherein the processor compares the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency to the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency, and

wherein the processor selects one of the first operating frequency and the second operating frequency as exhibiting at least one of drain voltage output and time slope differential indicative of a higher transducer electrical operating efficiency.

4. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 3, further comprising:

a memory resource enabling storage of at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency.

5. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 4,

wherein the processor stores in the memory resource at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency.

6. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 5,

wherein one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency is indicative of higher transducer electrical operating efficiency.

7. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 1,

wherein the Class F third order harmonic peaking frequency blocking circuit segment precludes at least fifth order harmonics through the drain voltage.

8. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 2, further comprising:

a radiometer disposed in acoustic communication with the piezoelectric transducer and in electrical communication with the processor.

9. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 8,

wherein the radiometer measures acoustic power of the transducer at at least the first operating frequency.

10. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 9, wherein the processor associates the acoustic power of the transducer at at least the first operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the first operating frequency.

11. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 10, further comprising:

a memory resource enabling storage of at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the acoustic power of the transducer associated with the at least first operating frequency.

12. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 11,

wherein the processor stores in the memory resource at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the acoustic power of the transducer associated with the at least first operating frequency.

13. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 8,

wherein the radiometer measures acoustic power of the transducer at at least the first operating frequency and the second operating frequency.

14. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 13,

wherein the processor associates the acoustic power of the transducer at at least the first operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the first operating frequency, and

wherein the processor associates the acoustic power of the transducer at at least the second operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the second operating frequency.

15. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 14,

wherein the processor selects one of the first operating frequency and the second operating frequency as exhibiting at least one of drain voltage output and time slope differential indicative of a higher transducer electrical operating efficiency with respect to the acoustic power measured by the radiometer at the selected frequency.

16. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 15, further comprising:

a memory resource,

the memory resource enabling storage of at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

17. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 16,

wherein the processor stores in the memory resource at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

18. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 1, further comprising:

a piezoelectric transducer electrically connected with the inductor; and

a memory resource having stored therein at least one of the drain voltage output and time slope differential prior to switch turn-on measured at a selected operating frequency;

an associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

19. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 18, wherein the drain voltage output and time slope differential prior to switch turn-on measured at the selected operating frequency and the associated acoustic power of the transducer at at least the selected operating frequency are selected at an operating frequency of the transducer at which the transducer operates at a higher electrical efficiency with respect to the associated acoustic power as compared to operating frequencies of the transducer other than the selected operating frequency.

20. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 18,

wherein the processor retrieves from the memory resource at least one of the drain voltage output and time slope differential prior to switch turn-on measured at a selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

21. The system for at least one of calibrating and driving a piezo-electric transducer according to claim 20,

wherein the processor programs the frequency oscillator to establish the selected operating frequency as the operating frequency of the electrical signal oscillator switch therein to drive the piezoelectric transducer at the selected operating frequency retrieved from the memory resource.

22. A method for at least one of calibrating and driving a piezo-electric transducer, the method comprising the steps of:

providing;

a system for at least one of calibrating and driving a piezo-electric transducer, wherein the system comprises;

a voltage supply providing power to the system

a Class F third order harmonic peaking blocking circuit segment in electrical communication with an electrical signal switch and with the voltage supply and configured to enable a drain voltage output having a time differential slope prior to signal passage through the harmonic frequency blocking circuit at turn-on of the oscillator switch, and wherein third order harmonics are rejected by the third order harmonic peaking blocking circuit segment; and

an inductor in electrical communication with the harmonic frequency blocking circuit segment wherein the inductor is disposed to enable electrical connection in parallel with a piezo-electric transducer, the transducer electrically representing a parallel resonant resistive-capacitive circuit segment that is configured to receive the oscillating signal input at the operating frequency and to produce kinetic energy output.

23. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 22, further comprising the steps of:

providing a piezoelectric transducer electrically connected with the inductor,

wherein magnitude of the time differential slope and magnitude of the drain voltage prior to switch turn on are indicative of transducer electrical operating efficiency, and

measuring, at at least a first operating frequency, at least one of the drain voltage output and time slope differential prior to switch turn-on.

24. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 23, further comprising the steps of:

measuring, at at least a second operating frequency, at least one of the drain voltage output and time slope differential prior to switch turn-on,

comparing the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency to the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency, and

selecting one of the first operating frequency and the second operating frequency as exhibiting at least one of drain voltage output and time slope differential indicative of a higher transducer electrical operating efficiency.

25. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 24, further comprising the step of:

providing a memory resource enabling storage of at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency.

26. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 25, further comprising the step of:

storing in the memory resource at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency.

27. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 26,

wherein one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the second operating frequency is indicative of higher transducer electrical operating efficiency.

28. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 22,

wherein the Class F third order harmonic peaking frequency blocking circuit segment precludes at least fifth order harmonics through the drain voltage.

29. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 23, further comprising the step of:

measuring the acoustic power of the transducer at at least the first operating frequency.

30. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 29, further comprising the step of:

associating the acoustic power of the transducer at at least the first operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the first operating frequency.

31. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 30, further comprising the step of:

providing a memory resource enabling storage of at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the acoustic power of the transducer associated with the at least first operating frequency.

32. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 31, further comprising the step of:

storing in the memory resource at least one of the at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the first operating frequency and the acoustic power of the transducer associated with the at least first operating frequency.

33. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 24, further comprising the step of:

measuring acoustic power of the transducer at at least the first operating frequency and the second operating frequency.

34. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 33, further comprising the steps of:

associating the acoustic power of the transducer at at least the first operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the first operating frequency, and

associating the acoustic power of the transducer at at least the second operating frequency with the at least one of the drain voltage output and time slope differential prior to switch turn-on at at least the second operating frequency.

35. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 34, further comprising the step of:

selecting one of the first operating frequency and the second operating frequency as exhibiting at least one of drain voltage output and time slope differential indicative of a higher transducer electrical operating efficiency with respect to the acoustic power measured at the selected frequency.

36. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 35, further comprising the step of:

providing a memory resource,

the memory resource enabling storage of at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

37. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 36, further comprising the step of:

storing in the memory resource at least one of the drain voltage output and time slope differential prior to switch turn-on measured at the selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

38. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 22, further comprising the steps of:

providing a piezoelectric transducer electrically connected with the inductor; and

providing a memory resource having stored therein at least one of the drain voltage output and time slope differential prior to switch turn-on measured at a selected operating frequency;

an associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

39. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 38, further comprising the step of:

selecting the drain voltage output and time slope differential prior to switch turn-on and the associated acoustic power of the transducer at at least an operating frequency of the transducer at which the transducer operates at a higher electrical efficiency with respect to the associated acoustic power as compared to operating frequencies of the transducer at other than the selected operating frequency.

40. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 38, further comprising the step of:

retrieving from the memory resource at least one of the drain voltage output and time slope differential prior to switch turn-on measured at a selected operating frequency;

the associated acoustic power of the transducer at at least the selected operating frequency; and

the selected operating frequency.

41. The method for at least one of calibrating and driving a piezo-electric transducer according to claim 40, further comprising the step of:

programming the frequency oscillator to establish the selected operating frequency as the operating frequency of the electrical signal oscillator switch; and

driving the piezoelectric transducer at the selected operating frequency retrieved from the memory resource.