Power supply having source determination circuitry utilized to disable battery charging circuitry in powered device

• US 7,868,486 B2
• Filed: 11/28/2006
• Issued: 01/11/2011
• Est. Priority Date: 01/15/2004
• Status: Expired due to Fees

• Current Assignee: Comarco Wireless Technologies Incorporated (Comarco Incorporated)
• Original Assignee: Comarco Wireless Technologies Incorporated (Comarco Incorporated)
• Inventors: Lanni, Thomas W.
• Primary Examiner(s): Fureman, Jared J
• Assistant Examiner(s): CAVALLARI, DANIEL J
• Application Number:
  US11/604,950
• Publication Number:
  US 20070073420A1
• Time in Patent Office: 1,505 Days
• Field of Search: 307/80, 307/28, 307/31, 307/151, 713/322, 713/300, 713/310, 713/320, 713/340, 715/700, 715/716, 345/156, 323/313, 320/132, 320/138, 700/22
• US Class Current: 307/151
• CPC Class Codes: G05F 1/00 Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
• CPC Class Codes: H01R 29/00 Coupling parts for selective co-operation with a counterpart in different ways to establish different circuits, e.g. for voltage selection, for series-parallel selection, programmable connectors
• CPC Class Codes: H02J 1/00 Circuit arrangements for dc mains or dc distribution networks
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection

Abstract

A power supply provides a DC voltage to power an electronic device which includes battery charging circuitry. The power supply can be selectably coupled to alternative types of power sources and converts the power received from a power source to the DC voltage. The power supply includes source determination circuitry which generates a signal indicative of the type of power source to which the power supply is coupled. The DC voltage and the power source indication signal are provided to the electronic device. In response to the power source indication signal, a controller within the electronic device controls the amount of power drawn by the device by disabling the battery charging circuitry.

Claims

1. A system comprising:

a power supply, which can be selectably coupled to one of a plurality of types of power sources external to the power supply, the power supply including;

conversion circuitry which converts power received from the power sources to a DC voltage; and

source determination circuitry which generates a signal indicative of a selected type of the power sources to which the power supply is coupled to receive the power, wherein the DC voltage and the signal are provided as outputs of the power supply; and

an electronic device, external to the power sources and the power supply, which receives the DC voltage and the signal output by the power supply, the electronic device including a controller for controlling an amount of power drawn from the power supply by the electronic device in response to the signal, wherein the controller controls the amount of power drawn by the electronic device by disabling battery charging circuitry within the electronic device, while the electronic device receives the DC voltage output by the power supply.

2. The system according to claim 1, wherein the electronic device is a portable computer.

3. The system according to claim 1, wherein the power supply can be coupled to an AC power source external to the power supply.

4. The system according to claim 1, wherein the power supply can be coupled to a DC power source external to the power supply.

5. The power supply according to claim 1, wherein the source determination circuitry includes a comparator.

6. The power supply according to claim 1, wherein the source determination circuitry includes a processor.

7. The system according to claim 1, wherein the signal is selected from the group consisting of a transmission of a discrete bit, a transmission of a plurality of bits, an analog signal and an analog voltage.