A wireless power transmission two-stage rectification circuit and its impedance adjustment method

Abstract

The invention discloses a two-stage rectification circuit for wireless power transmission and an impedance adjustment method thereof. The compensation circuit includes: a coupling coil, three capacitors, and two inductors; the first rectification circuit includes: two inductors, two capacitors, two diodes, and two power switches; The second rectification circuit includes: a third inductor, a fourth inductor, a third capacitor, a fourth capacitor, a third diode, a fourth diode, a third power switch, a fourth power switch, an eighth capacitor, and a resistor; When the control angle on both sides of the input current peak value of the first rectification circuit is within the preset range, the first and second power switches are kept off; when it is outside the preset range, the first and second power switches are kept on; when the second rectifier When the control angle on both sides of the input current peak value of the circuit is within a preset range, the third and fourth power switches are kept turned off; when it is outside the preset range, the third and fourth power switches are kept turned on. Through the invention, the equivalent impedance of the receiving stage circuit interface can be continuously adjusted, and the ripple of the output voltage can be reduced at the same time.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a two-stage rectification circuit for wireless power transmission and an impedance adjustment method thereof. Background technique [0002] The wireless power transmission system includes a transmitting circuit and a receiving circuit, and a double-sided LCC structure can be adopted. There is a magnetic coupling mechanism between the transmitting circuit and the receiving circuit, and there is a compensation circuit in the transmitting circuit and the receiving circuit. The rectification circuit is used after the compensation circuit of the receiving circuit to obtain a DC output voltage and provide DC power for the load of the latter stage. There are many kinds of DC power loads, including constant power loads, constant current loads, pure resistance loads, inverter loads and battery loads. From an average point of view, for a symmetrical load such as a storage batter...

AI Technical Summary

Problems solved by technology

[0003] Based on the above, searching for the post-stage rectification circuit and impedance matching circuit of wireless power transmission found that no technology related to equivalent impedance adjustment with better symmetry and better real-time performance has been found.

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