【电磁技术在线】【低频篇】- 3. 无线充电

讲师：Christian Kremers

01：30 电感耦合

04：00 软磁材料：铁氧体线性化

09：30 铁氧体损耗：Steinmetz拟合

10：45 铁氧体损耗：磁导虚部获取

12：40 绞合线损耗：半分析模型

19：00 绞合线损耗：等效材料模型

22：30 后处理：变压器电路

26：30 系统级仿真：电源电路

Wireless Electrical Vehicle Charging (WEVC) is expected to play a major part in the roll-out of electric vehicles, allowing them to be charged conveniently in garages, car parks and bus stops.

In this video, we focus on:

• Workflows and best practices to predict the performance of individual coils as well as inductively coupled systems in the automotive environment. A magnetic coupler coil design was simulated.
  

• The accurate loss prediction in litz wires and ferrite materials

• Extraction of equivalent circuit parameter and relevant design quantities using a specialized postprocessing template was shown.Based on circuit description the operating point was deduced. Field and loss distributions at operating point were calculated and postprocessed to check exposure limits.
  

• Examples of electric vehicle charging and the charging of electronic devices inside the car

“Steinmetz coefficients”：

The losses Pc in W/set in a soft ferrite core may be expressed as

Where:

f (kHz) is the actual operating frequency and B (mT) the actual operating peak sinusoidal flux density at an operating temperature Top (°C);

pvsin is the loss density in kW/m3 at temperature Top(°C), frequency fb (kHz) and peak sinusoidal flux density Bm (mT); 

Ve (mm3) is the magnetic volume of the core; 

Alpha is the Steinmetz exponent for frequency and Beta the Steinmetz exponent for flux density for the ferrite material at Top;

pvsin is measured on standard ring cores; 

KF is a multiplication factor for the particular core shape in use;