Transmitting-end dynamic tuning device and method based on double DC-DC converters

Abstract

The invention discloses a transmitting-end dynamic tuning device and method based on double DC-DC converters. A transmitting end comprises a DC power supply E, a DC-DC converter DA, a full-bridge inverter NA, a transmitting-end compensation network TC and a transmitting coil Lp, wherein the DC power supply E, the DC-DC converter DA, the full-bridge inverter NA, the transmitting-end compensation network TC and the transmitting coil Lp are connected sequentially. A receiving end comprises a receiving coil Ls, a receiving end compensation network RC, a rectifier bridge Z, a load Z and a DC filtering capacitor Cd, wherein the receiving coil Ls, the receiving end compensation network RC, the rectifier bridge Z, the load Z and the DC filtering capacitor Cd are connected sequentially, and the DCfiltering capacitor Cd is connected to two ends of the load RZ in a parallel manner. The dynamic tuning device comprises a DC / DC converter DB, a full-bridge inverter NB, and a transformer. The beneficial effects of the invention are that the phases of the output voltage and current of the inverter are directly measured, so as to judge the resonant state of the transmitting end, so the device is simple and effective, and is good in real-time performance; the tuning device enables the output of the full-bridge inverter NB to remain resistive, reduces the reactive power of a system, can reduce the capacity of a power supply through resonance adjustment, can achieve real-time tuning, is high in tuning precision, and enables the transmitting end to be closer to an ideal resonant state; the device enables the output voltage to achieve the closed-loop control and maintains the constant-voltage output through the DC / DC converter.

Description

technical field [0001] The invention relates to a dynamic tuning device and a tuning method for a sending end in an inductively coupled wireless power transmission device, in particular to a dynamic tuning device and a method for a sending end based on a double DC-DC converter. 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 promising ways to develop towa...

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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