Abnormal Protection Method for Secondary Side of Wireless Power Transmission System

Abstract

The invention discloses a protection method against abnormity of a secondary side of a wireless electric energy transmission system. The method comprises the following steps that a circuit of the secondary side is provided with a detection module, and N types of abnormal states are obtained; an active off-resonance capacitor array is connected to a secondary side compensation network in parallel, and the active off-resonance capacitor array can be used to obtain at least N switch combination states and N different capacitance values; each abnormal state corresponds to one switch combination state, and when an abnormal state signal is detected, the active off-resonance capacitor array outputs the corresponding capacitance value, so that the system is off resonance and corresponding time difference of voltage and current zero crossing points is generated in a primary side; a voltage sampling circuit and a current sampling circuit obtains the time difference Tdelay of the voltage and current zero crossing points; and the abnormal state of the time difference Tdelay of the voltage and current zero crossing points is determined, and a corresponding circuit is controlled to implement corresponding protection motions. The protection method has the advantages that the occupation space is small, the cost is low and the method is easy to realize; the independence is high; the instantaneity is high, and response is fast; and the reliability and stability are high.

Description

technical field [0001] The invention relates to the field of wireless power transmission, in particular to a secondary side abnormality protection method of a wireless power transmission system. Background technique [0002] With the increasing maturity of basic research on wireless power transmission technology and the continuous promotion of industrialization, more and more attention has been paid to the stability and reliability of the system. To ensure the stability and reliability of the system, more testing and corresponding protection modules. The detection and protection of the primary side circuit can be directly processed by the primary side controller. However, for the protection of the secondary side circuit, in most cases, the corresponding protection is carried out through the control scheme of the primary side circuit. [0003] At present, for the protection of the secondary circuit, the most used method is to add additional communication modules, such as RF...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a method for protecting the abnormality of the secondary side of the wireless power transmission system, which detects the working conditions of the secondary side circuit in real time, and feeds back the signal of the secondary side circuit to the primary side circuit by causing active detuning. The secondary side circuit is protected, the method is simple, easy to implement, and has good stability, which solves the problems of high cost and difficult control of the secondary side protection system in the past

Images