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Power transfer device and method

A technology of power transmission and equipment, applied in the direction of output power conversion devices, transmission systems, electrical components, etc.

Active Publication Date: 2011-06-08
CONVENIENTPOWER HK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Harmonics generated by constant switching power converters cause "conducted" electromagnetic interference (EMI) because current harmonics can adversely affect all other instruments using the same power supply through "conducted" cables

Method used

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other Embodiment approach

[0043] Other embodiments employ frequency hopping spread spectrum methods. A further embodiment of the spread spectrum technique utilizes a direct sequence spread spectrum method and a random frequency modulation method.

[0044] In one embodiment, the direct sequence spread spectrum method is realized by using the microprocessor control unit 7 and the voltage controlled oscillator 8 . The microprocessor control unit 7 has a clock frequency and generates switching control signals for a power inverter in the power transfer device 1 . The direct sequence spread spectrum method consists of storing a pseudo-random sequence in the microprocessor control unit 7 and sending out the pseudo-random sequence to modulate the clock frequency by a voltage controlled oscillator 8 . The microprocessor control unit 7 has an internal reference clock signal or an external reference clock signal. These reference clock signals provide the clock frequency. These reference clock signals may be pr...

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Abstract

The present invention provides a power transfer device for charging a wireless communication device having a communication bandwidth, and an associated method of transferring power. The device and method of the invention use a spread-spectrum technique to reduce or minimize interference signals within the communication bandwidth and within the power transfer device.

Description

technical field [0001] The present invention relates to power transfer devices, and more particularly but not exclusively to power transfer devices for charging wireless communication devices. This disclosure will describe a power transfer device for wirelessly charging a portable wireless communication device. It should be noted, however, that the invention is not limited to this particular use. Background technique [0002] In order to meet IEC Electromagnetic Compatibility (EMC) requirements, spread spectrum techniques have been proposed to reduce input switching harmonics in power supplies. [0003] Such as figure 1 As shown, the constant switching behavior of the power converter generates harmonics at a fixed frequency. IEC regulations place limits on the current harmonic components at the input. Harmonics generated by constant switching power converters cause "conducted" electromagnetic interference (EMI) because current harmonics can adversely affect all other ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00H04B1/69
CPCH02J7/025H02M1/44H02J7/00712H02J50/40H02J50/70H02J50/10H02J50/12
Inventor S·Y·R·惠薛泉温冠超
Owner CONVENIENTPOWER HK