A dynamic tuning device and tuning method for receiving end of wireless power transmission equipment

Abstract

The invention relates to the technical field of wireless power transmission, and discloses a dynamic tuning device for a receiving end of wireless power transmission equipment, and a tuning method implemented by the device. The device and the method have the advantages that a transformer is connected with a diode full-bridge rectifier in parallel and then cascaded with a DC / DC converter to form atuning circuit, a receiving edge voltage and a current phase difference are measured through a measuring coil and a phase detection device, a receiving edge resonance state is judged according to thedetected phase difference, and an equivalent impedance of a transformer original edge is adjusted through DC / DC converter duty cycle adjustments for real-time tuning, so that a receiving edge can be kept running in the resonance state, and the transmission efficiency of the wireless power transmission equipment can be improved.

Description

technical field [0001] The invention belongs to the technical field of wireless power transmission, in particular to a dynamic tuning device for a receiving end of a wireless power transmission device and a tuning method thereof. Background technique [0002] Compared with the traditional power supply method, the wireless power transmission system has the advantage of non-contact between the power supply body and the power receiver, which can solve the shortcomings of the traditional power supply method, especially for rail transit, and can solve the problem of traditional traction network and third rail power supply. In this way, the problems caused by moving wear and power supply body exposure can be solved, so as to realize the stable and safe power supply of locomotives. [0003] The inductively coupled wireless power transmission method is one of the most promising ones in the direction of high-power development among many wireless power transmission methods. The coil,...

AI Technical Summary

Problems solved by technology

[0004] The key issue of the inductively coupled wireless power transmission device is the transmission efficiency of the system, especially in the case of high power. Among them, the fluctuation of the load and the detuning of the resonant circuit are the main factors affecting the system efficiency. Due to the tolerance of the inductance and capacitor, Aging will cause circuit parameters to drift, and the system will be out of resonance, which will affect the output power and transmission efficiency of the system and reduce the performance of the system, so it is very important to maintain system resonance

[0005] Many researchers have studied the method of dynamic tuning to improve system efficiency through tuning. At present, dynamic tuning methods mainly include frequency tracking and impedance adjustment. Frequency tracking is to make the frequency of the inverter dynamically track the resonance frequency point. Need to add additional components and change the circuit topology, the implementation is simple, but there will be frequency bifurcation, resulting in failure to track the resonant frequency, and this method cannot be used when receiving multiple secondary sides; use impedance adjustment methods, such as capacitance matrix , variable inductance, variable capacitance and other methods, the capacitance matrix realizes dynamic tuning through the combination of series and parallel capacitors, but it can only work on a limited number of discrete capacitance value points, and the tuning device cannot be real-time and accurate; variable inductance, variable The capacitive method needs to increase the power switch. When the switch is used to control the impedance of the AC resistance, it must be synchronized with the high-frequency voltage or current in the resonant circuit. It needs to collect high-frequency signals and increase the switching loss.

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