Bidirectional Resonant Frequency Tracking for CLLC Converters Based On Voltage Falling Edges

2021 ◽  
Author(s):  
Jun Min ◽  
Martin Ordonez
Keyword(s):  
Resonant Frequency ◽  
Frequency Tracking

scholarly journals Frequency-Tracking Algorithm Based on SOGI-FLL for Wireless Power Transfer System to Operate ZPA Region

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1303
Author(s):  
Do-Hyun Kim ◽  
Min-Soo Kim ◽  
Hee-Je Kim
Keyword(s):  
Resonant Frequency ◽  
Wireless Power Transfer ◽  
Tracking Algorithm ◽  
Physical Contact ◽  
Switching Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Coupling Condition ◽  
Frequency Tracking ◽  
Load Variation

The wireless power transfer (WPT) system has attracted attention for energy transmission without physical contact. However, a WPT system has low coupling condition because of a big air gap between transmitter and receiver coils. The low coupling condition has a high leakage inductance. To overcome this problem, we design a proposed system for WPT using series-series (S-S) topology of one resonant circuit. To obtain the higher efficiency power conversion of the WPT system, it has to operate the resonant frequency in the zero phase angle (ZPA) point even under mutual coefficient and load variation. Therefore, we propose the resonant frequency tracking algorithm to operate ZPA point based on the second order generalized integrator-frequency locked loop (SOGI-FLL) method. This proposed frequency-tracking algorithm can estimate ZPA point by changing switching frequency. We can reduce the switching loss with this proposed algorithm and improve the low conversion efficiency of the WPT system. The performance of the proposed frequency-tracking algorithm is automatically verified through various coupling coefficients and the load variation.

Research on Ultrasonic Vibration Combined with Grinding Machining and its Application in Processing Brittle Hard Materials

2010 ◽  
Vol 447-448 ◽  
pp. 223-227
Author(s):  
Yong Jun Zhang ◽  
Yong Jun Tang ◽  
Xiao Kang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Resonant Frequency ◽  
Ultrasonic Vibration ◽  
Vibration System ◽  
Optimal Dimension ◽  
Frequency Tracking ◽  
Hard Materials ◽  
Compact Size ◽  
Driving Circuit

A system of ultrasonic combined with grinding has been designed, and one novel connective method of straight screw combined with taper surface has been applied in spindle, so compact size and high revolving accuracy can be achieved. Modal analysis of ultrasonic vibration system has been implemented by FEM (Finite Element Method), and its optimal dimension has been calculated to find out optimal vibration estate. Full-bridge converter has been applied in driving circuit of ultrasonic vibrator, and auto-frequency tracking has been designed in order that ultrasonic vibration works on resonant or quasi-resonant frequency. Finally, machining experiments have been fulfilled about ultrasonic combined with grinding, and its machining effect has been distinctly improved comparing ordinary grinding machining.

Sign in / Sign up

Export Citation Format

Share Document