Combined topology-based shift-resistant wireless electric energy transmission system

Abstract

The invention discloses a combined topology-based shift-resistant wireless electric energy transmission system. A voltage provided for a load under relatively large shift quantity is approximate to beconstant, the fluctuation is relatively small, and the combined topology-based shift-resistant wireless electric energy transmission system is applicable to a wireless electric energy transmission occasion. The system comprises a high-frequency full-bridge inversion circuit, a primary compensation network, a loose coupling transformer, a secondary compensation network and a full-bridge rectification filtering circuit. The combined topology employs output characteristics of two compensation topologies of S / LCC and LCC / S, and the voltage approximate to be constant is provided for the load underthe condition of relatively large shift quantity of a coil by a connection mode of primary side series connection and secondary side parallel connection; meanwhile, approximately-zero power factor ofinput impedance and soft switch of a switch device can be achieved, and the problem of relatively large fluctuation an output voltage of an existing constant-voltage output wireless electric energy transmission system with the coil shift of the loose coupling transformer is solved; and moreover, the loose coupling transformer employed in the two topologies can be integrally designed ad no volumeis increased.

Description

technical field [0001] The invention discloses an anti-deviation wireless power transmission system based on combined topology, which belongs to the wireless power transmission technology. Background technique [0002] Wireless charging technology (Wireless Power Transfer, WPT) is convenient, safe and reliable because there is no electrical and mechanical connection between the power supply end and the power receiving end. At present, the electromagnetic induction wireless power transfer (Inductive Power Transfer, IPT) technology is the most widely used WPT technology, so it has great research value. [0003] The loosely coupled transformer used in IPT technology has low coupling coefficient and large leakage inductance, which inevitably generates reactive circulating current in the circuit, which increases device stress and loss. Therefore, a compensation network is generally used to compensate the reactive energy generated by leakage inductance. Moreover, the compensation...

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Problems solved by technology

[0004] Since IPT uses a loosely coupled transformer to transmit energy, and the transmitting coil and receiving coil can move freely, it is inevitable that the two coils will be offset during the actual charging process, which will cause changes in the parameters of the compensation network, output voltage or current. There are large fluctuations

Aiming at the problem of transformer coil offset, some studies have proposed a new control strategy, but it reduces the transmission efficiency and reliability

Studies have proposed some coil design methods, such as: DD, DDQ and other coil structures, but none of them can effectively improve the offset problem

It has been proposed to use the characteristics of the S / LCC compensation topology and the LCC / S compensation topology to achieve constant voltage output and ZPA through the parallel connection of the primary side and the series connection of the secondary side. It also has good anti-offset capability, and adopts The integrated coil reduces the volume of the transformer, and the transmission efficiency and reliability are not affected. However, when the coil deviation of the loosely coupled transformer increases beyond a certain range, the voltage and current stress of the combined topology increase exponentially, which endangers the stable operation of the system.

[0005] From the above analysis, it can be seen that the current combined topology that can achieve constant voltage output and input ZPA and has good anti-offset capability still has the voltage and current stress of the combined topology that increases exponentially after the transformer coil deviation increases beyond a certain range. The problem

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