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Hybrid Wireless Power Transfer System

IP.com Disclosure Number: IPCOM000247526D
Publication Date: 2016-Sep-14
Document File: 5 page(s) / 423K

Publishing Venue

The IP.com Prior Art Database

Related People

Xu Chen: AUTHOR [+3]

Abstract

Wireless power transfer (WPT) has a wide market prospect due to the increasing market share of electric vehicles and the strong desire of charging consumer electronics without wiring. A huge amount of researches and commercial efforts have been done to realize the wireless power transfer. This disclosure proposes a new WPT system called hybrid wireless power transfer (HWPT) system, as shown in Figure 2. The proposed system combines both inductive power transfer and capacitive power transfer in a single system with a single dc power supply and an inverter. Many advantages have been brought by HWPT system like better couple coefficient, more design freedom degree, better utilization of the shielding aluminum plate and cost effective prospect in dynamic wireless power transfer system.

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Disclosure Title: Hybrid wireless power transfer system Principal Applications/Uses of the Disclosure


1. Wireless power transfer for electric vehicles;


2. Wireless power transfer for consumer electronics.

Problem Overcome by the Disclosure

Wireless power transfer (WPT) has a wide market prospect due to the increasing market share of electric vehicles and the strong desire of charging consumer electronics without wiring. A huge amount of researches and commercial efforts have been done to realize the wireless power transfer. But the methods used for wireless power so far have been either inductive power transfer (IPT) type as shown Figure 1(a) or capacitive power transfer (CPT) type as shown in Figure 1(b). Compensation networks are usually used in inductive power transfer system and capacitive power transfer system. For IPT in Figure 1(a), the inverter operates at the resonant frequency formed by

p

and c2

Figure 1: Block diagram of (a) inductive power transfer system and (b) capacitive power transfer system.

The couple coefficient of the WPT system is defined as M k

=

For WPT system, the couple coefficient k is a key parameter that has a strong effect on the performance of the system. A larger couple coefficient k can make the power transfer much easier with higher efficiency, lower EMF and better lateral tolerance. Unfortunately the couple

L and p

C . The secondary side resonant components s

L , s

                              C are also tuned to the same frequency of the primary side. For CPT in Figure 1(b), inverter operates at the resonant frequency of p

L , c1

C


C .

I nver te r

R e c tifi er

I nve rte r

Re c tif ie r

L and s

                                              L are the self-inductors of the primary and secondary side respectively and M is the mutual inductor of the two side. where p

Lp Ls

×



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coefficient is contradicted to the transfer distance. A lot of effort has been done to improve the performance of WPT system like optimizing the coil structure of the inductive power transfer system, optimizing the compensation network of the transmitter and receiver coil or optimizing the inverter and rectifier circuit using soft switching topologies and so on.

For inductive power transfer system, the equivalent couple coefficient can be improved by increase the coil area. For capacitive power transfer system, increasing the capacitor plate area can also get higher capacitor value thus increase the equivalent coupling coefficient. However, the area is usually confined due to specific applications such as the installation space etc.

Detailed Description of the Disclosure

This disclosure proposes a new WPT system called hybrid wireless power transfer (HWPT) system, as shown in Figure 2. The proposed system combines both inductive power transfer and capacitive power transfer in a single system with a single dc power supply and an inverter.

Many advantages have been brought by HWPT system like better couple coefficient, more design freedom degree, better utilization of the shielding aluminum...