Thin film microbattery charge and output control

• US 9,419,463 B2
• Filed: 11/29/2012
• Issued: 08/16/2016
• Est. Priority Date: 11/29/2012
• Status: Active Grant

• Current Assignee: Cymbet Corporation
• Original Assignee: Cymbet Corporation
• Inventors: Mullin, Jeffrey D., Sather, Jeffrey S.
• Primary Examiner(s): Dunn, Drew A
• Assistant Examiner(s): Robbins, Jerry D
• Application Number:
  US13/688,986
• Publication Number:
  US 20140145680A1
• Time in Patent Office: 1,356 Days
• Field of Search: 320/134, 320/135, 320/136
• US Class Current: 1/1
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/007192 in response to temperature

Abstract

A control system for charge and output control of a rechargeable thin film microbattery cell comprises a charge control logic component configured to control the level of charge of a thin film microbattery cell, a battery cut-off logic component to cease current draw on the thin battery thin film microbattery cell under predetermined conditions, a mode control logic component operably coupled to the charge control logic component and the battery cut-off logic component to enable operation of the charge control logic component and the battery cut-off logic component under predetermined conditions, and a Switch Capacitor DC-DC Downconverter Component for delivery of voltage external to the system configured to reduce battery output voltage potential by a factor of at least 2:1. Systems operably connected to a rechargeable thin film microbattery cell and powered devices comprising the system and the microbattery cell are also described.

Claims

1. A control system for charge and output control of a rechargeable thin film microbattery cell comprising

a charge control logic component configured to control the level of charge of a thin film microbattery cell, wherein the charge control logic component comprises a charge pump unit, a temperature controller reference that measures the ambient temperature of the system, and a temperature controlled shunt regulator, wherein the charge control logic is programmed to reduce the voltage of the thin film microbattery when the ambient temperature of the system exceeds a predetermined value by operation of the temperature controlled shunt regulator,

a battery cut-off logic component to cease current draw on the thin battery thin film microbattery cell under predetermined conditions,

a mode control logic component operably coupled to the charge control logic component and the battery cut-off logic component to enable operation of the charge control logic component and the battery cut-off logic component under predetermined conditions, and

a Switch Capacitor DC-DC Downconverter Component for delivery of voltage external to the system configured to reduce battery output voltage potential by a factor of at least 2:

1.

2. The system of claim 1, wherein the charge pump unit of the charge control logic component is one of a switch capacitor DC-DC boost converter or an inductive boost converter.

3. The system of claim 1, wherein the predetermined value of the ambient temperature is about 23 degrees C. and the voltage of the thin film microbattery is reduced according to an algorithm of about 2 to 2.5 mV per degrees C. above 23 degrees.

4. The system of claim 1, wherein the battery cut-off logic component operates to disconnect the battery from a load when the battery voltage is reduced to a value at or below a predetermined minimum value.

5. The system of claim 4, wherein the predetermined minimum value is a value selected from 2.8 to 3.2 volts.

6. The system of claim 1, wherein the battery cut-off logic component comprises a switch capacitor DC-DC downconverter array to reduce the voltage potential being used by internal circuits of the battery cut-off logic component to a level of from about 10 to about 700 millivolts.

7. The system of claim 1, wherein the Switch Capacitor DC-DC Downconverter Component for delivery of voltage external to the system reduces the voltage potential by an integer ratio of from 2:

1 to 5;

1.

8. The system of claim 1, wherein the Switch Capacitor DC-DC Downconverter Component for delivery of voltage external to the system reduces the voltage potential to from about 0.3 V to about 3.3 V.

9. The system of claim 1, wherein the Switch Capacitor DC-DC Downconverter Component for delivery of voltage external to the system reduces the voltage potential to from 100 to 500 millivolts.

10. The system of claim 1, wherein the Switch Capacitor DC-DC Downconverter Component comprises a second switch capacitor DC-DC downconverter array to reduce the voltage potential being used by internal circuits of the battery cut-off logic component to a level of from about 10 to about 700 millivolts.

11. The system of claim 1, wherein the battery cut-off logic component comprises a circuit configuration to limit leakage currents to a value not exceeding about 30 picoamps.

12. The system of claim 1, wherein the system does not comprise a linear regulator.

13. The system of claim 1, wherein the components of the system are located on a single integrated circuit.

14. The system of claim 13, wherein the system is operably connected to a rechargeable thin film microbattery cell having an effective capacity of no greater than about 500 μ

AH.

15. The system of claim 14, wherein the system and the rechargeable thin film microbattery cell are configured as a two terminal connection component to be connected to a powered electronic device.

16. A powered electronic device comprising the system of claim 15.

17. The system of claim 14, wherein the system and the rechargeable thin film microbattery cell are configured as a three terminal connection component to be connected to a powered electronic device.

18. A powered electronic device comprising the system of claim 17.