A soft-switching high-efficiency wireless charging method based on bilateral phase shift and frequency modulation

A wireless charging and soft switching technology, applied in charging stations, electric vehicle charging technology, electric vehicles, etc., can solve problems such as difficulty in meeting, and achieve the effect of reducing reactive power consumption, reducing energy consumption, and improving efficiency

Active Publication Date: 2020-08-18
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in practical applications, this condition is often difficult to meet due to changes in the parameters of the coil, capacitance, etc.

Method used

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  • A soft-switching high-efficiency wireless charging method based on bilateral phase shift and frequency modulation
  • A soft-switching high-efficiency wireless charging method based on bilateral phase shift and frequency modulation
  • A soft-switching high-efficiency wireless charging method based on bilateral phase shift and frequency modulation

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Embodiment Construction

[0014] figure 2 Shown is a soft-switching wireless charging circuit with frequency modulation and double-sided phase shifting using the method of the present invention and its control block diagram, including a main circuit 1 and a control system 2 .

[0015] The main circuit 1 includes primary side auxiliary branch 101, primary side full bridge circuit 102, secondary side full bridge circuit 103, secondary side auxiliary branch 104, transmission coil and its compensation network 105, primary side DC side capacitor 106, secondary side DC side capacitor 107. The control system 2 includes a phase detector 206 , a phase shift controller 204 , a wireless signal transmission link 203 , a sampling link 205 , a first driver 201 , a second driver 202 , a first resonance control link 208 , and a second resonance control link 207 . The output voltage and current sensor is connected to the input end of the sampling link 205 , and the output end of the sampling link 205 is connected to ...

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Abstract

The invention discloses a soft switching high-efficiency wireless charging method based on bilateral phase shifting and frequency adjusting. The DC side of a sending end converter and the DC side of areceiving end converter of a wireless charging system are each connected with a soft switching auxiliary branch circuit, by reasonably controlling the on and off of an auxiliary switching tube and resonating the voltage of a bridge arm into zero before the switching tube is switched on, the zero-voltage on of all sending end switching devices and receiving end switching devices is realized. Meanwhile, according to the soft switching bilateral phase shifting control system, by means of the frequency adjusting method, the switching frequency is the same as the resonating frequency all the time,the loss problem caused by the idle work under detuning can be avoided, and efficiency is further improved. The method is simple in structure and convenient to implement, the soft switching work of the power converters of the wireless charging system is ensured, the partial efficiency of the converters is improved, and the low-reactive loss of original side coils and auxiliary side coils is realized through the frequency adjusting and phase shifting control mode.

Description

technical field [0001] The invention relates to a high-efficiency wireless charging method, in particular to a soft-switching high-efficiency wireless charging method based on bilateral phase shifting and frequency modulation. The method can be used not only for wireless charging of electric vehicles, but also for other wireless charging systems. Background technique [0002] With the rapid development of fields such as electric vehicles and consumer electronics, wireless power transmission technology has begun to receive widespread attention because it can free users from the shackles of cables. In wireless power transmission, efficiency is one of the most important indicators. In order to improve the efficiency of the wireless charging system, foreign experts proposed a bilateral phase-shifting wireless power transfer circuit and confirmed that it has high efficiency characteristics (Diekhans T, De Doncker R W.A Dual-Side Controlled Inductive Power Transfer System Optimize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L53/122
CPCY02T10/70Y02T10/7072Y02T90/14
Inventor 陈敏王矗徐德鸿钟文兴
Owner ZHEJIANG UNIV
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