Rectified power supply

• US 7,317,303 B1
• Filed: 11/30/2006
• Issued: 01/08/2008
• Est. Priority Date: 11/30/2006
• Status: Expired due to Fees

• Current Assignee: Celis Semiconductor Corp.
• Original Assignee: Celis Semiconductor Corp.
• Inventors: DeVilbiss, Alan D.
• Primary Examiner(s): Laxton; Gary L
• Application Number:
  US11/564,954
• Time in Patent Office: 404 Days
• Field of Search: 323/222, 323/223, 323/226, 323/273, 323/282, 323/349, 323/351, 323/352, 340/10.1, 340/10.2, 340/10.5, 343/850, 343/860, 343/861, 363/89, 363/125
• US Class Current: 323/223
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

A power supply creates a voltage difference between high and low power supply rails. The power supply has a voltage signal source, a capacitive coupling element, energy storage element 12, first and second rectifying diodes, a regulator, and bypass means for selectively decreasing the impedance between the voltage signal source and the low power supply rail or increasing the load presented to the voltage signal source. The capacitive coupling element is connected to the voltage signal source. Energy storage element 12 stores energy between the high and low power supply rails. The first rectifying diode is positioned between the capacitive coupling element and energy storage element 12. It is coupled to the voltage signal source through the capacitive coupling element and arranged to favor current flow toward energy storage element 12 from the capacitive coupling element. The second rectifying diode is positioned between the capacitive coupling element and the low power supply rail. It is coupled to the voltage signal source through the capacitive coupling element and arranged to favor current flow toward the capacitive coupling element from the low power supply rail. The regulator regulates the level of energy stored in energy storage element 12.

Claims

1. A power supply for creating a voltage difference between high and low power supply rails, the power supply comprising:

a voltage signal source;

a capacitive coupling element connected to the voltage signal source;

an energy storage element for storing energy between the high and low power supply rails;

first and second rectifying diodes, the first rectifying diode positioned between the capacitive coupling element and the energy storage element, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the energy storage element from the capacitive coupling element, the second rectifying diode positioned between the capacitive coupling element and the low power supply rail, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the capacitive coupling element from the low power supply rail;

regulator means for regulating the level of energy stored in the energy storage element;

bypass means, responsive to the regulator means, for selectively decreasing the impedance between the voltage signal source and the low power supply rail.

2. The power supply of claim 1 wherein the voltage signal source includes an antenna and a tuning capacitive element in parallel with the antenna.

3. The power supply of claim 1 wherein the regulator means includes a shunt regulator for regulating the level of energy stored in the energy storage element.

4. The power supply of claim 3 wherein the shunt regulator is in a parallel configuration with the energy storage element.

5. The power supply of claim 4 wherein the bypass means includes a third diode element in parallel with the capacitive coupling element, arranged to favor current flow toward the first and second rectifying diodes from the voltage signal source.

6. The power supply of claim 3 wherein the shunt regulator is in a parallel configuration with the second rectifying diode.

7. The power supply of claim 6 wherein the bypass means includes a PNP bipolar transistor having a base, an emitter, and a collector, the PNP bipolar transistor arranged with the emitter connected to the voltage signal source, the collector connected to the low power supply rail, and the base connected between the capacitive coupling element and the first rectifying diode.

8. A power supply circuit for creating a voltage difference between high and low power supply rails, the power supply comprising:

a voltage signal source;

a capacitive coupling element connected to the voltage signal source;

an energy storage element for storing energy between the high and low power supply rails;

first and second rectifying diodes, the first rectifying diode positioned between the capacitive coupling element and the energy storage element, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the energy storage element from the capacitive coupling element, the second rectifying diode positioned between the capacitive coupling element and the low power supply rail, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the capacitive coupling element from the low power supply rail;

regulator means for regulating the level of energy stored in the energy storage element;

bypass means, responsive to the regulator means for, selectively increasing the load presented to the voltage signal source.

9. The power supply of claim 8 wherein the voltage signal source includes an antenna and a tuning capacitive element in parallel with the antenna.

10. The power supply of claim 8 wherein the regulator means includes a shunt regulator for regulating the level of energy stored in the energy storage element.

11. The power supply of claim 10 wherein the shunt regulator is in a parallel configuration with the energy storage element.

12. The power supply of claim 11 wherein the bypass means includes a third diode element in parallel with the capacitive coupling element, arranged to favor current flow toward the first and second rectifying diodes from the voltage signal source.

13. The power supply of claim 10 wherein the shunt regulator is in a parallel configuration with the second rectifying diode.

14. The power supply of claim 13 wherein the bypass means includes a PNP bipolar transistor having a base, an emitter, and a collector, the PNP bipolar transistor arranged with the emitter connected to the voltage signal source, the collector connected to the low power supply rail, and the base connected between the capacitive coupling element and the first rectifying diode.

15. A power supply for creating a voltage difference between high and low power supply rails, the power supply comprising:

a voltage signal source;

a capacitive coupling element connected to the voltage signal source;

an energy storage element for storing energy between the high and low power supply rails;

a first rectifying diode positioned between the capacitive coupling element and the energy storage element, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the energy storage element from the capacitive coupling element;

a directional current flow control means for favoring current flow toward the capacitive coupling element from the low power supply rail, the directional current flow control means positioned between the capacitive coupling element and the low power supply rail;

regulator means for regulating the level of energy stored in the energy storage element;

bypass means, responsive to the regulator means, for selectively decreasing the impedance between the voltage signal source and the low power supply rail.

16. The power supply of claim 15 wherein the voltage signal source includes an antenna and a tuning capacitive element in parallel with the antenna.

17. The power supply of claim 15 wherein the regulator means includes a shunt regulator for regulating the level of energy stored in the energy storage element.

18. The power supply of claim 17 wherein the shunt regulator is in a parallel configuration with the energy storage element.

19. The power supply of claim 17 wherein the shunt regulator is in a parallel configuration with the directional current flow control means.

20. The power supply of claim 19 wherein the bypass means includes a PNP bipolar transistor having a base, an emitter, and a collector, the PNP bipolar transistor arranged with the emitter connected to the voltage signal source, the collector connected to the low power supply rail, and the base connected between the capacitive coupling element and the first rectifying diode.

21. The power supply of claim 20 wherein the directional current flow control means includes a junction between the base and the collector of the PNP bipolar transistor.

22. The power supply of claim 15 wherein the directional current flow control means includes a second rectifying diode coupled to the voltage signal source through the capacitive coupling element.

23. A power supply circuit for creating a voltage difference between high and low power supply rails, the power supply comprising:

a voltage signal source;

a capacitive coupling element connected to the voltage signal source;

an energy storage element for storing energy between the high and low power supply rails;

a rectifying diode positioned between the capacitive coupling element and the energy storage element, coupled to the voltage signal source through the capacitive coupling element, arranged to favor current flow toward the energy storage element from the capacitive coupling element;

a directional current flow control means for favoring current flow toward the capacitive coupling element from the low power supply rail, the directional current flow control means positioned between the capacitive coupling element and the low power supply rail;

regulator means for regulating the level of energy stored in the energy storage element;

bypass means, responsive to the regulator means for, selectively increasing the load presented to the voltage signal source.

24. The power supply of claim 23 wherein the voltage signal source includes an antenna and a tuning capacitive element in parallel with the antenna.

25. The power supply of claim 23 wherein the regulator means includes a shunt regulator for regulating the level of energy stored in the energy storage element.

26. The power supply of claim 25 wherein the shunt regulator is in a parallel configuration with the energy storage element.

27. The power supply of claim 25 wherein the shunt regulator is in a parallel configuration with the directional current flow control means.

28. The power supply of claim 27 wherein the bypass means includes a PNP bipolar transistor having a base, an emitter, and a collector, the PNP bipolar transistor arranged with the emitter connected to the voltage signal source, the collector connected to the low power supply rail, and the base connected between the capacitive coupling element and the first rectifying diode.

29. The power supply of claim 28 wherein the directional current flow control means includes a junction between the base and the collector of the PNP bipolar transistor.

30. The power supply of claim 23 wherein the directional current flow control means includes a second rectifying diode coupled to the voltage signal source through the capacitive coupling element.