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Wireless power transfer system

A technology of power transmission and power, applied in the direction of high-efficiency power electronic conversion, electrical components, circuit devices, etc., can solve the problems of reduced range or power throughput, reduced IPT system efficiency, increased power loss, etc.

Active Publication Date: 2019-03-01
IMPERIAL INNOVATIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such changes in the magnetic field may cause the magnetic field to exceed ICNIRP limits and / or result in an undesired reduction in maximum achievable range or power throughput
The change in current also leads to increased power loss due to loss of ZVS operation and thus reduces the efficiency of the IPT system

Method used

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Embodiment Construction

[0047] The invention will now be described more fully with reference to the accompanying drawings.

[0048] figure 1 is a schematic circuit diagram of an inverter 100 according to the present disclosure. The inverter 100 is based on a class E inverter, more specifically an "EF" class inverter. In operation, inverter 100 converts direct current (DC) from power source 102 to alternating current (AC).

[0049] EF class and E / F class inverters are hybrid inverters, which will improve F class and F class -1 The switching voltage and current waveforms of a class inverter are combined with the efficient switching of a class E inverter. Therefore, their efficiency, output power and power output capability may be higher than class E inverters in some cases.

[0050] A class EF inverter is formed by adding a resonant network in parallel or in series to its load network. The method of adding a resonant network to the load network is used in classes F and F -1 class inverters, and a...

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PUM

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Abstract

A power inverter is disclosed herein. The power inverter is suitable for driving a transmitter coil in an inductive power transfer system, wherein the inverter is suitable for class 'EF' operation. The inverter is arranged to drive a load resistance, and comprises a switching device arranged between a power source and ground and arranged to switch at a switching frequency. The inverter also comprises a resonant network arranged in parallel with the switching device between the power source and ground, the resonant network having a resonant frequency which is a non-integer multiple of the switching frequency, such that, in operation, a substantially constant current passes through the load resistance.

Description

technical field [0001] The present disclosure relates to wireless power transfer. In particular, the present disclosure relates to inverters based on EF-type topology suitable for driving transmitter coils in inductive power transfer systems. Background technique [0002] Wireless power transfer has many industrial applications, and devices utilizing wireless power transfer, such as wireless toothbrush chargers, wireless charging pads for mobile devices, and wirelessly charging medical devices implanted in the body, will continue to grow in popularity. [0003] Inductive Power Transfer (IPT) is an example of non-radiative wireless power transfer. In a typical inductive power transfer system, an alternating current is passed through a transmitter coil. This causes the transmitter coil to generate a time-varying magnetic field. When the receiver coil is placed in a time-varying magnetic field, the magnetic field induces an alternating current in the receiver coil, which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/12H02M7/537
CPCH02M7/537H02J50/12Y02B70/10
Inventor 保罗·米切森大卫·耶茨萨梅尔·阿尔达希尔
Owner IMPERIAL INNOVATIONS LTD