[Faculty] Fwd: [CSRC-SDSU COLLOQUIUM]: High Efficiency Wireless EV Charger Based on Capacitive Power Transfer Principle

[Jose Castillo]

*DATE:*  Friday, October 23, 2015

*TITLE:*  High Efficiency Wireless EV Charger Based on Capacitive Power
Transfer Principle

*TIME:*  3:30 PM

*LOCATION:*  GMCS 214

*SPEAKER:*  Dr. Chris Mi.  Department of Electrical and Computer
Engineering, San Diego State University

*ABSTRACT:*  Capacitive power transfer (CPT) and inductive power transfer
(IPT) are two effective methods to transfer power wirelessly. The CPT
technology utilizes high-frequency alternating electric filed to transfer
power without direct electric connection, while the IPT system uses
magnetic field to transfer power. The IPT technology has already been
widely used in many applications, such as portable electronic devices,
biomedical devices, and electric vehicle charging. Compared with the IPT
system, the CPT system has many advantages. Magnetic fields are sensitive
to nearby metal objects and the system efficiency drops quickly with this
interference. It can generate eddy current losses, and hence heats in a
conductive object, which creates a potential fire hazard. However, the
electric filed in the CPT system does not generate significant losses in
the metal objects. Compared with previous work, this paper focus on 150mm
distance power transfer by capacitive coupling. It is essentially designed
for electric vehicle charging application. At this large distance, the
coupling capacitance is typically at pF range. The series resonance
topology is no longer suitable. In this presentation, a double-sided
LCLC-compensated topology and its design process are proposed. Two pairs of
metal plates are utilized to form two coupling capacitors to transfer power
wirelessly. The LCLC-compensated structure can dramatically reduce the
voltage stress on the coupling capacitors and maintain unity power factor
at both the input and output. A 2.4kW CPT system is designed with four
610mm × 610mm copper plates and an air gap distance of 150mm. The
experimental prototype reaches a dc-dc efficiency of 90.8% at 2.4kW output
power. At 300mm misalignment case, the output power drops to 2.1kW with
90.7% efficiency. With a 300mm air gap distance, the output power drops to
1.6kW with 89.1% efficiency.

*HOST:*  Dr. Jose Castillo

For future events, please visit our website at:

http://www.csrc.sdsu.edu/colloquium.html


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Jose E. Castillo  Ph.D.

Director / Professor

Computational Science Research Center

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San Diego State University

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 http://www.csrc.sdsu.edu/mimetic-book/
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