Transmitting end dynamic tuning device and method based on double inverter

Abstract

The invention discloses a transmitting end dynamic tuning device and method based on a double inverter. A transmitting end mainly comprises a DC / DC converter DA, a full bridge inverter NA, a transmitting end compensating network TC and a transmitting coil Lp; a receiving end mainly comprises a receiving coil Ls, a receiving end compensating network RC, a rectifier bridge Z, a load R and a direct current filter capacitor Cd; the transmitting end dynamic tuning device mainly comprises a full bridge inverter NB and a transformer; and the input end of the full bridge inverter NB is connected to the output end or the input end of the DC / DC converter DA in parallel. The transmitting end dynamic tuning device has the beneficial effects that the resonant state of a primary side is judged by directly measuring the phases of output voltages and currents of the inverters, so that the device is simple, effective and high in real-time performance; the dynamic tuning device is simple in structure, the full bridge inverter NB is in a soft switching state all the time, so that the switching loss of the inverters is reduced; real-time tuning is realized by adjusting the phase difference of controlsignals of the two inverters, so that the device is high in regulation speed and high in tuning precision; and a closed-loop control is formed by output voltage by using the DC / DC converter so as to maintain constant output voltage.

Description

technical field [0001] The invention relates to a dynamic tuning device and a tuning method for a transmitting end in an inductively coupled wireless energy transmission device, in particular to a dynamic tuning device for a transmitting end based on a double inverter and a tuning method for the same. 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 greatly improves the flexibility of the electrical equipment, and at the same time avoids the wear and tear of the traditional contact power supply method , sparks, leakage and other issues have improved the safety of equipment power supply. With the deepening of research, it has been widely used in electronic products, electric vehicles, medical equipment and other equipment. [0003] The inductively coupled wireless power transmission method is one of the most promis...

AI Technical Summary

Problems solved by technology

[0004] In high-power wireless power transmission devices, transmission efficiency is a key issue. Due to device aging, temperature rise, distance changes between electromagnetic coupling mechanisms, and lateral offsets, the parameters of devices such as capacitors and inductors in the system will change. The system deviates from the resonance state, resulting in a decrease in the transmission efficiency of the system. Under the same power demand, the system's demand for power supply capacity also increases, reducing the performance of the system, so it is necessary to maintain the resonance state of the system

[0005] At present, many researchers have studied the method of dynamic tuning to improve system efficiency. 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. Additional components and changing the circuit topology are easy to implement, but frequency bifurcation will occur, resulting in failure to track the resonant frequency. In addition, this method cannot be used for multi-side reception; impedance adjustment methods, such as capacitance matrix, can be used 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; the variable inductance and variable capacitance The 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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