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A variable capacitance electric vehicle ipt system

A technology of variable capacitors and electric vehicles, which is applied in the adjustment of resonance deviation of LCC resonant circuits and in the field of electric vehicle charging. Switching loss and switching stress, and the effect of improving charging efficiency

Inactive Publication Date: 2021-07-13
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The paper "LCC Resonant Converter Asymmetric Phase Shift Control and Efficiency Optimization Method" (Journal of Electrotechnical Society, Vol32(8)) proposed a method of using PWM phase shift hybrid modulation to control the duty cycle of the two bridge arms of the inverter respectively , can achieve a high degree of control freedom, but the phase shift angle is not easy to control
Although ZVS can be achieved, but the phase shift angle is too large, it cannot guarantee that the resonant circuit will work in a weak inductance. If the inductance is too strong, the power factor of the resonant circuit will decrease.

Method used

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  • A variable capacitance electric vehicle ipt system
  • A variable capacitance electric vehicle ipt system
  • A variable capacitance electric vehicle ipt system

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The specific operation steps of embodiment are:

[0044] Firstly, the main parameters are calculated by the fundamental wave analysis method to determine the parallel resonant capacitor C 1 , series resonant capacitor C 2 value of .

[0045] According to the analysis of the LCC compensation circuit by KVL and KCL, it can be known that:

[0046]

[0047] Z ref is the reflection impedance of the car end, L 2 is the coupler self-inductance, C 1 is the parallel impedance capacitance, C 2 is a series impedance capacitor. L 1 Compensation inductance for LCC.

[0048] Z ref =R ref +jX ref

[0049] It can be seen from formula (1) that when the can be achieved when separate from the reflected impedance. Let the resonant frequency of the circuit be set to ω 0 , then there are:

[0050]

[0051] In order to realize the zero phase of the input voltage and input current, it is necessary to meet:

[0052]

[0053] Therefore it can be determined that C 1 ...

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Abstract

A variable-capacitance electric vehicle IPT system includes a transmitter and a car end, the transmitter provides energy to the car through a coupling resonant coil at the transmitter, and the specific structure of the transmitter includes: an AC / DC rectifier circuit, a full-bridge inverter circuit , MOSFET drive circuit, LCC series-parallel resonant circuit, signal conditioning circuit, DSP controller, variable capacitor bank, transmitter coupled resonant coil. The invention can make the IPT system not affected by the change of the reflection impedance of the automobile end, make the resonance frequency of the LCC resonant circuit close to the main switching frequency and maintain the weak inductance of the resonant circuit.

Description

technical field [0001] The invention relates to the field of electric vehicle charging, in particular to the field of resonance deviation adjustment of an LCC resonant circuit for wireless charging of electric vehicles. Background technique [0002] The IPT system (inductively coupled power wireless transmission system) can realize the wireless transmission of electric energy, and has the advantages of high efficiency, high power, simple control, and various forms. It has been widely used in household appliances, consumer electronics, underwater equipment, etc. Wireless power supply of equipment. With the rapid development of electric vehicles, IPT has begun to be applied to wireless charging of electric vehicles. LC series resonance has strong ability to resist short circuit of load, but it is not suitable for open circuit of load. LC parallel resonance has good open circuit characteristics, but it is not suitable for short circuit. LCC series-parallel resonance has the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L53/12B60L53/122H02J50/12
CPCB60L53/12B60L53/60H02J50/12Y02T10/70Y02T10/7072Y02T90/12Y02T90/14
Inventor 苏海滨李震徐志程卢子涵李永春张文涛杨文奇
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER