# US 5,710,507 A · Temperature-controlled battery reserve system and method of operation thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,710,507 A - Document ID: US5710507A - Status: Granted - Kind: A - Application number: 08/638,023 - Filed: 1996-04-26 - Granted: 1998-01-20 - Earliest claimed: 1996-04-26 - Assignees: Lucent Technologies Inc. - Inventors: David B. Rosenbluth; Apurba Roy; Gabriel G. Suranyi - Web page: https://patentgrep.com/patent/US5710507A ## CPC - H02J 7/977: {of the battery} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract For use in a battery reserve system having a reserve battery, a charging circuit coupled between a source of electrical power and the reserve battery for charging the reserve battery and a heating element in thermal communication with the reserve battery for increasing a temperature of the battery, a mode selection circuit and method of operation thereof. The mode selection circuit includes: (1) a temperature transducer, coupled to the reserve battery, for sensing the temperature of the reserve battery and (2) a mode-changing circuit, coupled to the temperature transducer, for selecting an alternative one of: (a) a heating mode wherein the source of electrical power is coupled to the heating element when the temperature of the reserve battery is less than a reference temperature thereby to heat the reserve battery and (b) a charging mode wherein the source of electrical power is coupled to the reserve battery when the temperature is greater than the reference temperature thereby to charge the reserve battery. ## Claims ### Claim 1 For use in a battery reserve system having a reserve battery, a charging circuit coupled between a source of electrical power and said reserve battery for charging said reserve battery and a heating element in thermal communication with said reserve battery for increasing a temperature of said battery, a mode selection circuit, comprising: a temperature transducer, coupled to said reserve battery, for sensing said temperature of said reserve battery; and a mode-changing circuit, coupled to said temperature transducer, for selecting an alternative one of: a heating mode wherein said source of electrical power is coupled to said heating element when said temperature of said reserve battery is less than a reference temperature thereby to heat said reserve battery, and a charging mode wherein said source of electrical power is coupled to said reserve battery when said temperature is greater than said reference temperature thereby to charge said reserve battery. ### Claim 2 (depends on 1) The circuit as recited in claim 1 further comprising a circuit for disabling said heating element if said source of electrical power is disabled. ### Claim 3 (depends on 1) The circuit as recited in claim 1 wherein said heating element is operated at a voltage exceeding a voltage of said reserve battery. ### Claim 4 (depends on 1) The circuit as recited in claim 1 wherein said reference temperature is about 20.degree. C. ### Claim 5 (depends on 1) The circuit as recited in claim 1 wherein said charging circuit is a current-limited adjustable linear regulator. ### Claim 6 (depends on 1) The circuit as recited in claim 1 wherein said reserve battery is coupled to a boost converter, said boost converter having an output of about 30 volts. ### Claim 7 (depends on 1) The circuit as recited in claim 1 wherein said source of electrical power is a DC source provided from a power supply comprising a series-coupled rectifier and transformer. ### Claim 8 For use in a battery reserve system having a reserve battery, a charging circuit coupled between a source of electrical power and said reserve battery for charging said reserve battery and a heating element in thermal communication with said reserve battery for increasing a temperature of said battery, a method of selecting modes of said battery reserve system, comprising the steps of: sensing said temperature of said reserve battery with a temperature transducer coupled to said reserve battery; and selecting an alternative one of: a heating mode wherein said source of electrical power is coupled to said heating element when said temperature of said reserve battery is less than a reference temperature thereby to heat said reserve battery, and a charging mode wherein said source of electrical power is coupled to said reserve battery when said temperature is greater than said reference temperature thereby to charge said reserve battery. ### Claim 9 (depends on 8) The method as recited in claim 8 further comprising the step of disabling said heating element if said source of electrical power is disabled. ### Claim 10 (depends on 8) The method as recited in claim 8 further comprising the step of operating said heating element at a voltage exceeding a voltage of said reserve battery. ### Claim 11 (depends on 8) The method as recited in claim 8 wherein said reference temperature is about 20.degree. C. ### Claim 12 (depends on 8) The method as recited in claim 8 wherein said charging circuit is a current-limited adjustable linear regulator. ### Claim 13 (depends on 8) The method as recited in claim 8 wherein said reserve battery is coupled to a boost converter, method comprising the step of providing a 30 volts output from said boost converter. ### Claim 14 (depends on 8) The method as recited in claim 8 further comprising the step of providing said source of electrical power from a power supply comprising a series-coupled rectifier and transformer. ### Claim 15 A battery back-up power supply, comprising: a primary power supply; and a battery reserve system, comprising: a reserve battery; a charging circuit coupled between a source of electrical power and said reserve battery for charging said reserve battery; a heating element in thermal communication with said reserve battery for increasing a temperature of said battery; and a mode selection circuit, comprising: a temperature transducer, coupled to said reserve battery, for sensing said temperature of said reserve battery; and a mode-changing circuit, coupled to said temperature transducer, for selecting an alternative one of: a heating mode wherein said source of electrical power is coupled to said heating element when said temperature of said reserve battery is less than a reference temperature thereby to heat said reserve battery, and a charging mode wherein said source of electrical power is coupled to said reserve battery when said temperature is greater than said reference temperature thereby to charge said reserve battery. ### Claim 16 (depends on 15) The system as recited in claim 15 wherein said battery reserve system further comprises a circuit for disabling said heating element if said source of electrical power is disabled. ### Claim 17 (depends on 15) The system as recited in claim 15 wherein said heating element is operated at a voltage exceeding a voltage of said reserve battery. ### Claim 18 (depends on 15) The system as recited in claim 15 wherein said reference temperature is about 20.degree. C. ### Claim 19 (depends on 15) The system as recited in claim 15 wherein said charging circuit is a current-limited adjustable linear regulator. ### Claim 20 (depends on 15) The system as recited in claim 15 wherein said primary power supply further comprises a boost converter, said boost converter having an output of about 30 volts. ### Claim 21 (depends on 15) The system as recited in claim 15 wherein said source of electrical power is a DC source provided from said primary power supply comprising a series-coupled rectifier and transformer.