Method for estimating load and mutual inductance of wireless charging system

A wireless charging and wireless energy transmission technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of not being able to quantitatively estimate the load and mutual inductance of the wireless charging system at the same time, so as to avoid errors, reduce the amount of calculation, and simplify detection The effect of the circuit

Active Publication Date: 2017-12-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing technology cannot simply and effectively estimate the load and mutual i

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  • Method for estimating load and mutual inductance of wireless charging system
  • Method for estimating load and mutual inductance of wireless charging system
  • Method for estimating load and mutual inductance of wireless charging system

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The structure of the wireless charging system applying the present invention is as follows figure 2 shown. The wireless charging system applying the wireless charging system load estimation method includes a bus power supply 201, an inverter 202, a primary side compensation circuit 203, a wireless energy transmission coil 204, a secondary side compensation circuit 205, a rectifier bridge 206, and a load 207; The input end of the inverter 202 is connected to the bus power supply 201, the output end of the inverter 202 is connected to the input end of the primary side compensation circuit 203, and the output end of the primary side compensation circuit 203 is connected to the input end of the wireless energy transmission coil 204 , the output end of the wireless energy transmission coil 204 is connected to the input end of the secondary ...

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Abstract

The invention provides a method for estimating load and mutual inductance of a wireless charging system. The method comprises the following steps of A, performing rising edge zero-crossing detection on inverter output voltage, voltage of parallel capacitors in an original side compensating circuit, and input current of a wireless energy transmitting coil, and obtaining rising side zero-crossing time in one period; B, acquiring the working frequency of a wireless charging system, measuring inductance and capacitance in the original side compensating circuit, self-inductance values of the original side and the secondary side of the wireless energy transmitting coil, and calculating a reflection complex impedance of the secondary circuit; C, acquiring a functional relation between an equivalent input complex impedance of the secondary compensating circuit and the load; D, estimating the load by means of the reflection complex impedance of the secondary circuit and the functional relation between the equivalent input complex impedance of the secondary compensating circuit and the load; and E, estimating the mutual inductance by means of the reflection complex impedance of the secondary circuit, the functional relation between the equivalent input complex impedance of the secondary compensating circuit and the load, and the estimated value of the load.

Description

technical field [0001] The invention relates to a method for estimating load and mutual inductance of a wireless charging system. Background technique [0002] Due to the advantages of convenient use and no wire connection, wireless charging systems have received more and more attention, and have been introduced into embedded medical, electric vehicles, smart homes and other fields. In practical applications, the load and mutual inductance of the wireless charging system will change, which will affect the performance and control strategy of the wireless charging system. Patent CN 106532982 A "A Wireless Power Transmission System and Load Identification Method for On-Line Load Identification" By extracting and detecting the content and size of the fundamental wave and harmonic current in the load current, the equations about the load resistance and reactance are established, Thus identifying the nature and size of the load. However, it is detected on the secondary side, whi...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 郭彦杰张玉旺王丽芳徐冬平李芳张志刚李晨晖
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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