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An Inductive Wireless Charging System with Secondary Variable Parameters and Variable Structure

A technology of wireless charging and variable structure, applied in charging/discharging current/voltage regulation, current collectors, electric vehicles, etc., can solve problems such as reducing system stability, increasing control cost and complexity, and system instability

Active Publication Date: 2020-02-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the equivalent impedance of the load (battery) changes, it is difficult for the system to output the constant current or voltage required by the load under a certain input voltage.
In order to solve this problem, there are usually two methods: 1. Introduce closed-loop negative feedback control in the circuit system, such as adding a controller before the inverter to adjust the input voltage or adopting phase-shift control, or adding a negative feedback control after the secondary coil rectification DC-DC converter; its disadvantage is that it increases the cost and complexity of control and reduces the stability of the system
2. Using frequency conversion control, the system works at two different frequency points to achieve constant current and constant voltage output, but this method will cause frequency bifurcation, resulting in unstable system operation

Method used

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  • An Inductive Wireless Charging System with Secondary Variable Parameters and Variable Structure
  • An Inductive Wireless Charging System with Secondary Variable Parameters and Variable Structure
  • An Inductive Wireless Charging System with Secondary Variable Parameters and Variable Structure

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Embodiment approach

[0114] Such as image 3 As shown, the first specific embodiment of the present invention is an inductive wireless charging system with variable secondary parameters and variable structure, which is composed of a sending part and a receiving part. The sending part includes a DC power supply E, a high frequency Inverter H, primary compensation capacitor C T , primary coil L T ; The receiving part consists of secondary coils L connected in sequence R , Secondary coil compensator S A , Secondary compensation inductance L L And rectification filter circuit D, battery load Z.

[0115] The secondary compensator S A with secondary compensation inductance L L connection point and the secondary coil L R A constant current and constant voltage switching circuit Q is connected to the connection point of the rectification filter circuit D 1 , which consists of: secondary constant voltage compensation capacitor C C and toggle switch a S 1 in series, and switch a S 1 The control t...

Embodiment 2

[0134] Such as Figure 4 As shown, the second specific implementation mode of the present invention is an inductive wireless charging system with secondary variable parameters and variable structure, which is composed of a sending part and a receiving part. The sending part includes a DC power supply E connected in sequence, a high frequency Inverter H, primary compensation capacitor C T , primary coil L T ; The receiving part consists of secondary coils L connected in sequence R , Secondary coil compensator S A , Secondary compensation inductance L L And rectification filter circuit D, battery load Z.

[0135] The secondary coil compensator S A with secondary compensation inductance L L connection point and the secondary coil L R There is a constant current and constant voltage switching circuit three Q connected between the connection point of the rectification filter circuit D 3 , which consists of: secondary constant voltage compensation capacitor C C and Toggle S...

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Abstract

The invention discloses an inductive wireless charging system capable of changing the secondary structure and parameters. According to the invention, a constant-current constant-voltage switching circuit I and a constant-current constant-voltage switching circuit II are arranged in a receiving portion, a secondary constant-voltage compensation capacitor is connected with a change-over switch I in series, and a control end of the change-over switch I is connected with a controller I; the constant-current constant-voltage switching circuit II is formed by connecting a secondary constant-current compensation capacitor and a change-over switch II in series, and a control end of the change-over switch II is connected with the controller I. The invention further discloses a second implementation scheme which is slight different from the scheme at the control end. The inductive wireless charging system with the structure disclosed by the invention not only can output constant current, but also can output constant voltage, thereby being applicable to charging a battery, especially being applicable to charging multiple loads under a single power supply; The inductive wireless charging system is convenient to control, stable in operation, simple in structure, low in requirement for the capacity of an inverter and low in manufacturing cost, the input impedance is purely resistive in the whole process, input of reactive power can be avoided, and the system efficiency can be improved.

Description

technical field [0001] The invention relates to an inductive wireless charging system with variable secondary parameters and variable structure. Background technique [0002] Inductive wireless power transmission technology provides flexible, safe and reliable power supply to electrical appliances in a non-contact manner through a magnetic field, avoiding safety problems such as contact sparks and leakage in traditional plug-in power transmission systems. The technology is already widely used in built-in medical devices, consumer electronics, lighting and electric vehicles. Among them, the use of inductive wireless power transfer systems for wireless charging of batteries has great development prospects. [0003] In order to achieve safe charging of the battery, prolong the service life of the battery and the number of charge and discharge times, it usually mainly includes two charging stages of constant current and constant voltage. That is, the constant current mode is u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/10H02J7/00
CPCH02J5/005H02J7/0013H02J7/007H02J7/025
Inventor 麦瑞坤陈阳张友源何正友
Owner SOUTHWEST JIAOTONG UNIV
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