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Online Recognition Algorithm for Resistive-Inductive Loads Applied to Primary-side Control of Wireless Power Transmission

A technology of wireless power transmission and primary side control, applied to circuit devices, electrical components, etc., can solve problems such as inability to handle resistive and inductive loads, and achieve the effect of secondary side voltage stability

Active Publication Date: 2019-08-23
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still cannot deal with the common problem of resistive and inductive loads.

Method used

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  • Online Recognition Algorithm for Resistive-Inductive Loads Applied to Primary-side Control of Wireless Power Transmission
  • Online Recognition Algorithm for Resistive-Inductive Loads Applied to Primary-side Control of Wireless Power Transmission
  • Online Recognition Algorithm for Resistive-Inductive Loads Applied to Primary-side Control of Wireless Power Transmission

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0034] figure 1 Regulated primary-side control architecture for wireless power transfer based on online identification of load and coupling coefficients. In the figure, the DC input voltage is first regulated by a DC-DC module, and then converted into a high-frequency square wave voltage through high-frequency inverter. What needs to be explained here is that the DC-DC module is not necessary. When we use phase-shifting For full bridge control, this module can be omitted. The high-frequency square wave is transmitted to the primary coil with a compensation circuit, and the energy is transmitted to the receiving coil of the secondary side through resonance, and then converted into a DC voltage to the load after high-frequency rectification.

[0035] figure 2 The primary side signal informa...

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Abstract

The invention discloses a resistor-inductance load online identification algorithm applied to radio electric energy transmission primary side control. The system is divided into two stages which are a parameter online identification stage and a constant voltage power output stage. When a system works at a parameter online identification stage, the system needs to switch to work at two working frequency point, a first working frequency is set as an offset resonance frequency + / -5%, and a second working frequency is set as a resonance frequency f0. When the system works at the parameter identification stage, through feeding the instantaneous value of primary side current i1, the phase information and effective value or amplitude information of the primary side current are obtained and are used for calculating the reflection impedance of a main circuit, and thus the inductance and resistance values of the load and the coupling coefficient between primary and secondary side coils. After the corresponding inductance value and coupling coefficient are obtained, the system switches to the constant voltage power output stage, at that time, an output voltage control parameter is obtained according to the identified inductance value and the coupling coefficient, and the output voltage control parameter and the coupling coefficient are taken as initial values and are given to a controller.

Description

technical field [0001] The invention belongs to the technical field of wireless power transmission control, and in particular relates to an online identification algorithm for resistive and inductive loads applied to primary side control of wireless power transmission. Background technique [0002] The current wireless power transmission output voltage control technology is mainly divided into primary side control and secondary side control. [0003] The secondary side control is used to adjust the stability of the output voltage by connecting a DC-DC circuit (generally Boost circuit) in series between the load and the receiving circuit. The advantage of the secondary side voltage control method is that the control is simple and the output voltage is stable. Side control is difficult and requires an increase in the complexity of the device. [0004] The primary-side control samples the output voltage of the secondary side as a feedback value, and transmits it to the primary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12
Inventor 雷万钧王腾博施伶陈明锋刘奉华徐宁一
Owner XI AN JIAOTONG UNIV
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