Supplying electrical power

• US 7,327,850 B2
• Filed: 07/15/2003
• Issued: 02/05/2008
• Est. Priority Date: 07/15/2003
• Status: Expired due to Fees

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Belanger, Robert, Crump, Steve, Gauger, Daniel M. Jr.
• Primary Examiner(s): Chin; Vivian
• Assistant Examiner(s): Faulk; Devona E
• Application Number:
  US10/619,789
• Publication Number:
  US 20050013447A1
• Time in Patent Office: 1,666 Days
• Field of Search: 381/71.6, 381/72, 381/74, 381/370, 381/323
• US Class Current: 381/74
• CPC Class Codes: A61F 11/145 electric, e.g. for active noise reduction
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H04R 1/1041 Mechanical or electronic switches, or control elements switches in general H01H
• CPC Class Codes: H04R 1/1083 Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06
• CPC Class Codes: H04R 2460/03 Aspects of the reduction of energy consumption in hearing devices

Abstract

A power supply includes a battery source supplying power and a voltage converter circuit. The voltage converter circuit converts the power to the input voltage supplied to other circuitry. The voltage converter circuit varies the input voltage in response to a load current drawn by the other circuitry from the power supply.

Claims

1. An active noise reduction (ANR) headset system comprising:

a headset circuitry receiving an input voltage; and

a power supply providing the input voltage to the headset circuitry, the power supply comprising;

a direct current (DC) voltage source supplying power; and

a voltage converter circuit converting the power to the input voltage supplied to the headset circuitry, the voltage converter circuit varying the input voltage in response to changes to a headset load current drawn by the headset circuitry from the power supply,

a shutoff circuit placing the headset circuitry in a lower power consumption state when the headset load current falls below a threshold value for a predetermined amount of time,

wherein the headset circuitry comprises;

an ANR circuit receiving a signal from a microphone positioned in an earcup and including a feedback loop to actively reduce the signal;

a first voltage regulator limiting a voltage supplied to the ANR circuit and to an amplifier to a first predetermined voltage; and

a second voltage regulator limiting the input voltage of the headset circuitry to a second predetermined voltage.