Reserve power system for any battery operated device

• US 6,427,072 B1
• Filed: 12/30/1998
• Issued: 07/30/2002
• Est. Priority Date: 12/30/1998
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Reichelt, Martin
• Primary Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US09/223,211
• Time in Patent Office: 1,308 Days
• Field of Search: 455/404, 455/564, 455/565, 455/574, 455/572, 455/575, 455/38.3, 455/343, 340/636
• US Class Current: 455/404.1
• CPC Class Codes: H02J 9/002 in which a reserve is maintained in an energy source by disconnecting non-critical loads, e.g. maintaining a reserve of charge in a vehicle battery for starting an engine
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04M 1/72418 for supporting emergency services
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 52/0296 switching to a backup power supply
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile telephone with an emergency call capability protector monitors a battery power supply circuit with an emergency call reserve power detector to determine when the power remaining in the battery power supply circuit has decreased beneath a pre-selected minimum emergency call reserve power level that is greater than the absolute minimum level detected by a monitor and battery depletion detector. A microprocessor operating in accordance with a program stored in an emergency call capability program memory selectively inhibits, subject to override, the making of non-emergency calls and terminates ongoing non-emergency calls when said power detector determines that the power supply circuit has gone beneath said pre-selected minimum emergency call reserve power level.

Claims

1. A reserve power system for any battery operated mobile telephone, comprising:

a means for specifying a reserve power level that is greater than an absolute minimum limit power level for making an outgoing emergency call connection;

a register for storing a particular user defined emergency number;

a means for detecting when the power level of said reserve power system decreases beneath said specified power level; and

means responsive to the detecting means for inhibiting the operation of said mobile telephone for normal operation, but allowing for the operation of said mobile telephone for making an outgoing call connection request towards said emergency number.

2. The reserve power system for any battery operated device of claim 1, further comprising a means for detecting the connection of an external power supply and a means responsive to said means for detecting said external power supply for returning said battery operated device to normal operation.

3. The reserve power system of claim 1, further comprising a means responsive to the detecting means for terminating any ongoing non-emergency call.

4. The reserve power system of claim 1, further comprising a means responsive to said detecting means for generating a pre-termination warning.

5. The reserve power system of claim 1, further comprising a means for selectively overriding said inhibiting means.

6. The reserve power system of claim 5, wherein said selectively overriding means comprises:

a means for preliminarily selecting an override function;

a means responsive to said preliminarily selecting said override function to provide a prompt for confirmation of said override function selection;

a means for confirming said override function selection; and

a means responsive to said confirming said override function selection to actuate said override function to override said inhibiting means.

7. The reserve power system of claim 1, further comprising a means for providing a warning only without termination when said battery power level decreases beneath said specified reserve power level during an ongoing non-emergency call.

8. The reserve power system of claim 1, wherein said battery power supply includes:

a main battery power supply having at least one main battery;

an emergency back-up power supply having at least one back-up battery;

a means for controlling use of said battery power supply to switch at least some power using circuits of the reserve power system to draw power from said emergency back-up battery supply after said main battery power supply has been depleted beneath a preselected depletion level; and

a power level detecting means responsive to the power controlling means for sensing when said circuits have been switched to the back-up battery supply for actuating the non-emergency call inhibiting means.

9. The reserve power system of claim 8, further comprising:

a microcomputer for controlling substantially all reserve power system activities;

a sensing means which comprises a steering diode circuit for determining when said main battery has been depleted for purpose of switching all power consuming circuits to the back-up battery;

an interface circuit between said steering diode circuit and said microprocessor; and

a sensing subprogram stored within said microcomputer to actuate said inhibiting means in response to a determination that the main battery has been depleted.

10. The reserve power system of claim 1, wherein said detecting means includes a means for monitoring the total consumption of power from said battery power supply in order to detect when said power level remaining decreases beneath said emergency call reserve level.

11. The reserve power system of claim 10, wherein said detecting means includes a means responsive to said monitoring means for subtracting the total consumption of power from said main battery power supply from a maximum power storage capacity by said main battery power supply in order to detect a decrease of the main power supply beneath the emergency call reserve level.

12. The reserve power system of claim 1, further comprising:

a means for making an emergency call automatically in response to actuation of a special emergency call function, and wherein said detecting means further comprises a means for sensing actuation of the emergency call function to provide an emergency call indication to the detecting means.

13. A mobile telephone with a reserve power system, comprising:

a battery power supply;

a processor for making outgoing call connections and receiving incoming call connections;

a register for storing a value indicative of threshold power level associated with said battery power supply for making an emergency outgoing call connection for a particular period of time;

a second register for storing a particular user-defined emergency number;

a determiner for determining whether said battery power supply is below said threshold power level; and

wherein said processor prohibiting all incoming and outgoing call connections other than making an emergency outgoing call connection towards said user defined emergency number stored within said second register in response to said determination by said determiner.

14. The mobile telephone of claim 13, wherein said processor further disconnects any ongoing non-emergency call connection in response to said determination.

15. The mobile telephone of claim 13, further comprising a means for selectively overriding said processor from prohibiting said all incoming and outgoing call connections.

16. A method for protecting emergency call capability for emergency use of a mobile telephone having a battery power supply with a total power level that declines during operation, comprising the steps of:

specifying a minimum threshold value for said battery power supply;

storing a user defined emergency number;

receiving a request to originate an outgoing call connection towards a particular number;

originating said outgoing call connection while said power level is above said specified threshold value;

determining that said power level has decreased beneath said specified threshold value; and

determining whether said particular number associated with said outgoing call connection request matches said stored user defined emergency number;

in response to said determination that said particular number matches said stored user defined emergency number, originating said outgoing call connection;

otherwise;

denying said outgoing call connection request.