DC power source for an accessory of a portable communication device

• US 20060183509A1
• Filed: 02/16/2005
• Published: 08/17/2006
• Est. Priority Date: 02/16/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Shao, Shuyong
• Application Number:
  US11/059,155
• Publication Number:
  US 20060183509A1
• Time in Patent Office: Days
• US Class Current: 455/572
• CPC Class Codes: H02J 1/00 Circuit arrangements for dc mains or dc distribution networks
• CPC Class Codes: H04W 52/0277 according to available power supply, e.g. switching off when a low battery condition is detected
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An accessory (102) for a portable communication device (104) includes audio input ports (134) for receiving a differential audio signal having a DC bias (114), a speaker (116) coupled to the audio input ports, and accessory electronics (124) powered by the DC bias. The use of the DC bias of the differential audio signal (114) as a power source enhances the power source capability of the accessory (102).

Claims

1. An apparatus for supplying power to a remote accessory of a portable communication device, comprising:

at the portable communication device;

an audio power amplifier generating a differential audio output having a DC bias;

an interface coupling the differential audio output to the accessory;

at the accessory;

accessory circuitry being powered by the DC bias of the differential audio output.

2. The apparatus of claim 1, wherein the accessory is a remote speaker.

3. The apparatus of claim 1, wherein the accessory is a remote speaker-microphone.

4. The apparatus of claim 1, wherein the accessory is a cellular phone.

5. The apparatus of claim 1, wherein the accessory is a headset.

6. An accessory for a portable communication device, comprising:

audio input ports for receiving a differential audio signal having a DC bias;

a speaker coupled to the audio input ports; and

accessory electronics powered by the DC bias.

7. The accessory of claim 6, further comprising a controller and regulator for controlling and regulating the DC bias to the accessory electronics while maintaining audio quality.

8. An accessory for a communication device, comprising:

a primary supply input for receiving a first power source from the communication device for powering a first set of accessory circuitry; and

a secondary supply input for receiving a differential audio signal having a DC bias from the communication device for powering a second set of accessory circuitry.