Circuit and method for power mediation in electronic device

• US 6,680,601 B2
• Filed: 05/31/2002
• Issued: 01/20/2004
• Est. Priority Date: 05/31/2002
• Status: Expired due to Fees

• Current Assignee: Evolving Systems Labs Incorporated
• Original Assignee: Telespree Communications (CCUR Holdings, Inc.)
• Inventors: Wallgren, Markus
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US10/160,577
• Publication Number:
  US 20030222625A1
• Time in Patent Office: 599 Days
• Field of Search: 320/104, 320/134, 320/136, 320/149, 320/166
• US Class Current: 320/166
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A power mediation method and circuit for powering a communications controller based device using battery cells that exhibit non stable power delivery characteristics. The use of a servo-loop creates an energy potential in an energy storage element and maintains that required energy potential using the functionality of the communications controller that concurrently draws required power from the energy storage element.

Claims

1. A method of powering an communications controller, comprising:

charging an energy storage element from a coupled feedback controlled energy source;

drawing power from the energy storage element to power the communications controller; and

with circuitry available within a communications controller,

sampling the energy potential available on the energy storage element,

comparing the energy potential available on the energy storage element to determine failure to meet a minimum acceptable criteria, and if that criteria is not met,

enabling a feedback signal output which is coupled to the feedback controlled energy source thereby enabling the coupled feedback controlled energy source to charge the energy storage element.

2. The method of claim 1 wherein,

the energy storage element comprises an passive component.

3. The method of claim 2 wherein,

the passive component is selected from the group consisting of an inductor or a capacitor.

4. The method of claim 1 wherein,

the coupled feedback controlled energy source includes a controllable current source.

5. The method of claim 1 wherein,

the coupled feedback controlled energy source includes at least one alkaline primary cell coupled to a switch.

6. The method of claim 1 wherein,

the coupled feedback controlled energy source includes a controllable current source coupled to at least one alkaline primary cell.

7. The method of claim 1 wherein,

the step of sampling the energy potential available on the energy storage element is facilitated with a comparator device within the communications controller to render a digital representation of the energy potential available.

8. The method of claim 7 wherein,

the comparator device is an analog to digital converter.

9. The method of claim 7 wherein,

the step of comparing the energy potential available on the energy storage element comprises performing a mathematical operation on the rendered digital representation using an internally applied reference bit sequence.

10. The method of claim 7 wherein,

the step of sampling the energy potential available on the energy storage element comprises sampling a proxy reference voltage that is developed from the energy potential available on the energy storage element.

11. A power supply circuit for a micro controller having a sampling device and a central processing unit and method for controlling a comparing function and a first output port, the power supply circuit comprising:

an energy source coupled through a controllable switch to,

an energy storage device, the energy storage device further coupled to the micro controller, and the method comprising;

with the micro controller, sampling the energy stored on the energy storage device and comparing the sampled energy to determine failure to meet a minimum acceptable criteria; and

if the minimum acceptable criteria is not met, enabling the first output port to toggle the controllable switch and charge the energy storage device.

12. The power supply circuit of claim 11 wherein,

the energy source includes at least one alkaline primary cell.

13. The power supply circuit of claim 11 wherein,

the controllable switch is coupled to and controlled by the first output port of the micro controller.

14. The power supply circuit of claim 11 wherein,

the energy storage element comprises a capacitor, which is coupled to the energy source, and

the energy source includes a current source coupled to at least one primary battery cell by the controllable switch.

15. The power supply circuit of claim 14 wherein,

the current source includes a voltage controlled current source that is configured with a plurality of alkaline primary cells.

16. The power supply circuit of claim 11 further comprising,

an energy level shifting circuit that creates a proxy reference energy level dependent upon the energy stored on the energy storage device that is sampled by the micro controller to determine failure to meet a minimum acceptable criteria.

17. The power supply circuit of claim 16 wherein,

the energy level shifting circuit comprises a voltage divider.

18. The power supply circuit of claim 16 wherein,

the energy level shifting circuit further comprises a FET coupled to the voltage divider and also coupled to and controlled by a second output port of the micro controller.

19. A feedback and charging circuit for powering a communications controller from at least one alkaline primary cell;

the communications controller including a CPU with memory, a sampling device, a comparing device and a first output port, the CPU under software control to control the included devices and port;

the feedback and charging circuit comprising a switch, coupled to and controlled by the first output port, the switch coupled to and in control of a charging source, the charging source comprised of a current source supplied from the at least one alkaline primary cell, the current source coupled to a capacitor and a power supply input of the communications controller.