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Power adapter

A power adapter and circuit technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve problems such as waste of electric energy

Inactive Publication Date: 2015-03-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power adapter is connected to the AC power source and the load is removed, the rectifier and step-down converter in the power adapter are still working, which leads to waste of electric energy

Method used

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and preferred embodiment the present invention is described in further detail:

[0025] Please refer to figure 1 The first embodiment of the power adapter of the present invention includes a main body 10, an AC (Alternating Current, AC) input terminal 20 disposed on one side of the main body 10, and a DC (Directly Current, AC) input end 20 disposed on the other side of the main body 10. DC) output 30.

[0026] The main body 10 includes a switch 100 connected to the AC input terminal 20 through the first terminal 1, a pulse width modulation (Pulse Width Modulation, PWM) rectifier 40 connected to the second terminal 2 of the switch 100, a The PWM rectifier 40 and the step-down converter 50 of the DC output terminal 30 and an impedance detector 60 connected between the third terminal 3 of the switch 100 and the DC output terminal 30 .

[0027] The AC input terminal 20 is used for receiving an AC power 90 . In this embodimen...

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PUM

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Abstract

A power adapter comprises an alternating-current input end, a switch, a pulse width modulation rectifier and a direct-current output end. The alternating-current input end is used for accessing an alternating current. The pulse width modulation rectifier is connected with the alternating-current input end through the switch, and is used for rectifying the alternating current accessed by the alternating-current input end to obtain a direct current. The direct-current output end is connected to the pulse width modulation rectifier, and is used for outputting a direct current after conversion to provide working voltage for a load. An impedance detector is connected with the direct-current output end, and is used for detecting whether a load is connected to the direct-current output end. When no load is connected to the direct-current output end, the impedance detector outputs a low-level control signal to the switch, and the switch is off to make the pulse width modulation rectifier stop working. The power adapter of the invention can save electric energy.

Description

technical field [0001] The invention relates to a power adapter. Background technique [0002] Existing power adapters are used to convert alternating current (AC) to direct current (DC) through a rectifier and a step-down converter to power a load, such as an adapter for a laptop computer. However, when the power adapter is connected to the AC power source and the load is removed, the rectifier and the step-down converter in the power adapter are still working, which leads to waste of electric energy. Contents of the invention [0003] In view of the above, it is necessary to provide a power adapter that saves electric energy. [0004] A power adapter, comprising: [0005] an AC input terminal, used for accessing an AC power; [0006] A switch, including first to third terminals, the first terminal of the switch is connected to the AC input terminal; when the third terminal of the switch is at low level, the first terminal of the switch is disconnected from the second ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 陈宥任叶家铭
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD