Study on the Optimal Switching Frequency for Maximum Wireless Power Transfer in a Variable Airgap System

2015 ◽  
Vol 3 (1) ◽  
pp. 201-204 ◽  
Author(s):  
Chan-Bae Park ◽  
Hyung-Woo Lee
Keyword(s):  
Wireless Power Transfer ◽  
Switching Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Optimal Switching

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.

scholarly journals Variable-Frequency Pulse Width Modulation Circuits for Resonant Wireless Power Transfer

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3656
Author(s):  
Li-Chuan Tang ◽  
Shyr-Long Jeng ◽  
Edward-Yi Chang ◽  
Wei-Hua Chieng
Keyword(s):  
Duty Cycle ◽  
High Frequency ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Wireless Power Transfer ◽  
Switching Frequency ◽  
Variable Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Frequency Pulse

In this paper, we develop a variable-frequency pulse width modulation (VFPWM) circuit for input control of 6.78-MHz resonant wireless power transfer (WPT) systems. The zero-voltage switching control relies on the adjustments of both duty cycle and switching frequency for the class-E amplifier used in the WPT as the power transmission unit. High-frequency pulse wave modulation integrated circuits exist, but some have insufficiently high frequency or unfavorable resolution for duty cycle tuning. The novelty of this work is the VFPWM circuit design that we put together. A voltage-controlled oscillator (VCO) of radio frequency and capacitor-coupled difference amplifiers are used to simultaneously perform the frequency and duty cycle tuning required in resonant WPT applications. Different circuit topologies of VFPWM are compared analytically and numerically. The most favorable circuit topology, enabling independent control of the frequency and duty cycle, is employed in experiments. The experimental results demonstrate the validity of the novel VFPWM, which is capable of operating at 6.78 MHz and has a duty ratio adjustable from 20% to 45% of the range applicable in the resonant WPT applications.

scholarly journals Soft Switching of Three-Phase AC to DC CIHRC with Wireless Power Transfer (WPT) Function

2018 ◽  
Vol 9 (3) ◽  
pp. 965
Author(s):  
Rahimi Baharom
Keyword(s):  
Wireless Power Transfer ◽  
Current Injection ◽  
Soft Switching ◽  
Injection Technique ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Power Transfer ◽  
Wireless Power ◽  
High Switching Frequency ◽  
Three Phase

<span lang="EN-US">This paper presents the verification of soft switching condition for three-phase AC to DC current injection hybrid resonant converter (CIHRC) with wireless power transfer (WPT) function. Details on the operation of current injection technique with the lossless zero voltage switching (ZVS) condition on shaping the high power factor of supply current waveforms are presented. With a suitable high switching frequency operation, the proposed resonant converter is capable to operate with ZVS conditions, thus, allowing reduction in the size of inductive and magnetic components. Selected results are also presented to verify the lossless ZVS condition for three-phase AC-DC CIHRC with WPT function.</span>

A New Wireless Power Transfer Circuit With a Single-Stage Regulating Rectifier for Flexible Sensor Patches

2020 ◽  
Author(s):  
C.-P. Chang ◽  
W.-W. Yen ◽  
Paul C.-P. Chao
Keyword(s):  
Conversion Efficiency ◽  
Flexible Substrate ◽  
Wireless Power Transfer ◽  
Single Stage ◽  
Switching Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Heavy Load ◽  
Flexible Sensor ◽  
Light Load

Abstract A new wireless power transfer circuit with a single-stage regulating rectifier is designed and validated with satisfactory efficiency for flexible sensor patches. Since the battery is bulky and cannot be fabricated on a flexible substrate, the power source of the electronic patch is realized by wireless power transfer. Magnetic resonance transmission power at 13.56 MHz in the ISM band is adopted to make possible wireless power transfer. Furthermore, for high conversion efficiency, a new single-stage regulating rectifier is designed and implemented at the receiver side of the sensor patch. An active switching full-wave bridge rectifier is designed to reduce conduction loss and increase the voltage-conversion rate. A delay lock loop feedback controller overcomes the switching delays at high frequencies that significantly undermine power conversion efficiency. The voltage rectification and regulation are achieved simultaneously in a single-stage rectifier through 1X/0X mode control. The PFM control is adopted to select the switching frequency of the system in order to maximize the transient response during heavy load and to minimize the switching power losses during light load. The circuit is fabricated via the TSMC 0.35 μm process. The output efficiency of the circuitry was improved by 5–10% in light load as compared with the circuit without PFM control, while the peak efficiency reaches favorable 86%.

scholarly journals Conceptual study on Grid-to-Vehicle (G2V) wireless power transfer using single-phase matrix converter

2019 ◽  
Vol 10 (3) ◽  
pp. 1382
Author(s):  
Muhammad Qusyairi Iqbal Mohd Zamani ◽  
Rahimi Baharom ◽  
Dalina Johari
Keyword(s):  
Electric Vehicle ◽  
Single Phase ◽  
Wireless Power Transfer ◽  
Matrix Converter ◽  
Switching Frequency ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Charging System ◽  
Conceptual Study

<span>This paper presents the conceptual study on grid-to-electric vehicle (G2V) wireless power transfer (WPT) using Single Phase Matrix Converter (SPMC). In this work, the SPMC is used as a direct AC to AC converter to convert the input supply voltage at 50 Hz frequency to the output of 20 kHz to meet the WPT switching frequency operation of the transmitter and receiver coils. The high frequency AC voltage of the receiver coil is then rectified to a DC form by using SPMC. Through the proposed system, the battery of an electric car can be charged wirelessly, thus removing the annoying wires of the conventional electric vehicle charging system. The reduction in size of the charging system, power losses and optimum efficiency are among the advantages of the proposed system. MATLAB/Simulink (MLS) has been used to simulate the proposed model. Selected simulation result are presented to verify the proposed work.</span>

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