Power adapter with low power loss

• US 8,362,656 B2
• Filed: 08/25/2010
• Issued: 01/29/2013
• Est. Priority Date: 06/14/2010
• Status: Active Grant

• Current Assignee: Cloud Network Technology Singapore Pte. Ltd. (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Ho, Yu-Hua
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): PEREZ BORROTO, ALFONSO
• Application Number:
  US12/862,775
• Publication Number:
  US 20110304415A1
• Time in Patent Office: 888 Days
• Field of Search: 307/140, 439/39, 335/205
• US Class Current: 307/140
• CPC Class Codes: H01H 36/0013 characterised by the co-operation between reed switch and permanent magnet; Magnetic circuits
• CPC Class Codes: H01R 13/7037 making use of a magnetically operated switch
• CPC Class Codes: H01R 31/065 with built-in electric apparatus
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H02M 7/02 Conversion of ac power input into dc power output without possibility of reversal
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y04S 20/20 End-user application control systems

Abstract

A power adapter includes a power converter circuit, a direct current (DC) plug and a magnetic switch. The power converter circuit converts power signals of a power source into DC power signals. The DC plug is engageable with a jack of a powered device, and transmits the DC power signals to the powered device. The DC plug includes a magnetic force conducting wire to conduct magnetic force of a magnetic element when the powered device is powered. The magnetic switch, connected between the power source and the power converter circuit, is turned on or off according to if the magnetic force conducting wire conducts the magnetic force or not so as to control the power source to provide power to the power converter circuit.

Claims

1. A power adapter, connected between a power source and a powered device comprising a jack comprising a magnetic element, the power adapter comprising:

a power converter circuit, operable to convert power signals of the power source into direct current (DC) power signals suitable for driving the powered device;

a DC plug connected to the power converter circuit and engageable with the jack of the powered device, operable to transmit the DC power signals to the powered device, the DC plug comprising a magnetic force conducting wire to conduct magnetic force of the magnetic element when the powered device is powered, wherein the magnetic force conducting wire is ferromagnetic wire; and

a magnetic switch connected between the power source and the power converter circuit, operable to be turned on or off according to if the magnetic force conducting wire conducts the magnetic force or not, so as to control the power source to provide power to the power converter circuit.

2. The power adapter of claim 1, wherein the magnetic force conducting wire is attached to a ground of the DC plug.

3. The power adapter of claim 1, wherein the magnetic switch is connected between a DC power source of the power source and the power converter circuit.

4. The power adapter of claim 1, wherein the magnetic switch is connected between an alternating current power source and the power converter circuit.

5. A power adapter, connected between a power source and a powered device comprising a jack and a magnetic element, the power adapter comprising:

a power converter circuit, operable to convert power signals of the power source into direct current (DC) power signals suitable for driving the powered device;

a DC plug connected to the power converter circuit and engageable with the jack of the powered device, operable to transmit the DC power signals to the powered device, the DC plug comprising a magnetic force conducting wire to conduct magnetic force of the magnetic element when the powered device is powered, wherein the magnetic force conducting wire is ferromagnetic wire; and

a magnetic switch connected between the power source and the power converter circuit, operable to be turned on if the magnetic force conducting wire conducts the magnetic force and operable to be turned off if the magnetic force conducting wire not conducts the magnetic force, so as to control the power source to provide power to the power converter circuit.