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Noise suppression circuit for power adapter

A power adapter, noise suppression technology, applied in the direction of electrical components, output power conversion devices, etc.

Active Publication Date: 2013-05-01
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Type A adapter 120, on the other hand, does not have a ground pin and therefore induces noise that can enter the connected electronic equipment that the adapter powers.
[0005] Because many electronic devices use Type A adapters, the challenge is to suppress the noise induced in those devices while using that adapter

Method used

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  • Noise suppression circuit for power adapter
  • Noise suppression circuit for power adapter
  • Noise suppression circuit for power adapter

Examples

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Embodiment Construction

[0012] In the following description of example embodiments, reference is made to the accompanying drawings in which specific embodiments that may be practiced are shown by way of illustration. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the various embodiments.

[0013] The present disclosure relates to noise suppression circuits for power adapters that may be used to suppress noise induced by the adapter that adversely affects desired signals in devices powered by the adapter. In some implementations, the noise suppression circuitry may include active circuitry that detects and attenuates or cancels noise induced in the adapter. In some embodiments, the noise suppression circuit may include an RLC tuned circuit in parallel with the adapter choke to suppress noise induced by the choke at the operating frequency of the connected electronic device. Alternatively, the RLC tuning circuit may ...

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PUM

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Abstract

A noise suppression circuit for a power adapter is disclosed. The noise suppression circuit can reduce or eliminate adapter-induced noise that could interfere with an electronic device powered by the adapter. In one example, the noise suppression circuit can include an active circuit to detect and attenuate or cancel the induced noise. In another example, the noise suppression circuit can include an RLC circuit in parallel with the adapter choke to suppress the induced noise at the operating frequencies of the powered electronic device. In still another example, the noise suppression circuit can include a modified adapter Y capacitor connection so as to bypass the adapter choke, thereby reducing or eliminating the choke's induced noise.

Description

technical field [0001] The present invention relates generally to power adapters, and more particularly to noise suppression circuits for power adapters. Background technique [0002] Noise can be a persistent problem for electronic equipment because noise can come from various sources (both internal and external) and can adversely affect the desired signal of the device. In some cases, noise can involve power adapters used to power electronic equipment. [0003] Figure 1A and 1B Two types of power adapters commonly used to power electronic devices are described. exist Figure 1A For example, a "Type B" power adapter 110 may include a plug 112 that plugs into a power source, such as a wall outlet, to receive a voltage, such as AC voltage. The plug 112 may have three pins, including a live voltage pin 112-a, a neutral pin 112-b, and a ground pin 112-c. The adapter 110 may also include a connector 113 to connect to the electronic device in order to transmit a voltage, suc...

Claims

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Application Information

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IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor P·W·理查德S·P·霍泰玲
Owner APPLE INC
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