A Load Legitimacy Judgment Method for Inductive Wireless Power Transmission System
A technology for wireless energy transmission and legality determination, applied in transmission systems, near-field transmission systems, electrical components, etc., can solve problems such as increasing system costs, misreading and misjudgment, and reducing system reliability, so as to achieve easy implementation and guarantee Reliability, the effect of not being prone to electromagnetic interference
Active Publication Date: 2016-11-09
成都艾特能电气科技有限责任公司
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Problems solved by technology
[0006] It can be seen that RFID load identification technology is essentially based on radio frequency signals of a certain frequency for signal transmission. Due to the existence of magnetic energy conversion mechanisms and high-frequency power inverters in ICPT systems, RFID radio frequency signals are vulnerable to interference during energy wireless transmission. The interference of high-frequency electromagnetic fields may cause misreading and misjudgment, and reduce the accuracy of illegal load identification
In addition, RFID load identification technology needs to increase the electronic tag and its power supply, reader, and radio frequency antenna, which also increases the cost of the entire system and reduces the reliability of the system
Method used
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Embodiment
[0025] A specific implementation of the present invention is a load legality determination method of an inductive wireless power transmission system, the steps of which are:
[0026] energy transmitter
[0027] A1. The energy transmitting end controls the inverter circuit to inject a small high-frequency alternating current into the transmitting coil through the controller to generate a weak excitation magnetic field; and detects and records the transmitting coil current in real time, and connects the peak point of the transmitting coil current to obtain The envelope curve of the coil current amplitude changes, demodulates the low-frequency signal from the envelope curve, and then converts the low-frequency signal into a pulse sequence, and performs matching verification with its built-in key. If the verification passes, it is determined that the load at the energy pickup end is legal. Carry out the operation of step A2; otherwise, repeat the above operation.
[0028] A2. The...
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A load legitimacy determination method of an inductive wireless electric energy transmission system is provided. The method includes the following steps that: at an energy transmitting end, a controller controls a transmitting coil and enables the same to generate a weak magnetic field, and transmitting coil current is detected and recorded in a real-time manner, and frequency pulses are demodulated out from an envelope line of the transmitting coil current, testing is performed between the frequency pulses and a built-in key, if the testing succeeds, rated high-frequency alternating current can be implanted into the transmitting coil, and the system enters a normal energy transmission state; and at an energy pickup end, when an electromotive force induced by a pickup coil is lowered than a set threshold value, a controller of the energy pickup end controls a BOOST direct current conversion circuit and enables the same to work in a low-frequency mode, and the controller, with a pulse sequence containing authentication information adopted as switching control signals, enables the amplitude value of pickup coil current to change correspondingly and to be coupled to the transmitting coil, and when the electromotive force induced by the pickup coil exceeds the set threshold value, the BOOST direct current conversion circuit is switched to a high-frequency mode, and the energy pickup end enters a normal energy pickup state.
Description
technical field [0001] The invention relates to a load legality judging method of an inductive wireless power transmission system. Background technique [0002] Inductive wireless power transfer (ICPT) technology is based on the principle of electromagnetic field near-field loose coupling induction, and comprehensively utilizes power electronic conversion technology, magnetic field coupling technology and control theory to realize the technology that electrical equipment obtains energy from the grid in a non-wire contact manner. , has the characteristics of flexible power supply, safety and reliability, and low maintenance cost. [0003] A typical structure of an ICPT system generally consists of two parts, a completely electrically independent energy transmitter and an energy pick-up. The relationship between the energy transmitter and the energy pick-up can be one-to-one or one-to-many. The basic principle of the ICPT system is to use a resonant converter to convert power...
Claims
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IPC IPC(8): H02J50/10H04B5/00
Inventor 何正友李砚玲黄立敏李勇麦瑞坤林圣
Owner 成都艾特能电气科技有限责任公司