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A load estimation method for a wireless charging system

A technology of wireless charging and load estimation, which is applied in the direction of circuit devices and electrical components, etc., can solve the problem that the load of the wireless charging system cannot be simply and effectively estimated quantitatively, and achieve the effects of avoiding errors, improving estimation accuracy, and simplifying the detection circuit

Active Publication Date: 2020-04-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing technology cannot simply and effectively estimate the load of the wireless charging system quantitatively, and propose a method for estimating the load of the wireless charging system

Method used

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  • A load estimation method for a wireless charging system
  • A load estimation method for a wireless charging system
  • A load estimation method for a wireless charging system

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] 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 power supply 201, an inverter 202, an inverter output inductor 203, a primary side compensation capacitor 204, a wireless energy transmission coil 205, a secondary side compensation capacitor 206, and a rectifier bridge input Inductor 207, rectifier bridge 208, and load 209; the input end of described inverter 202 is connected with power supply 201, the output end of inverter 202 is connected with the input end of inverter output inductor 203, and the primary side compensation capacitor 204 The input end is connected to the output end of the inverter output inductor 203, the output end of the primary side compensation capacitor 204...

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Abstract

A wireless charging system load estimation method comprises the following steps: A, detecting voltage rising edge zero cross points before a rectifier bridge input voltage and a rectifier bridge input inductance, and obtaining a rising edge zero cross point time; B, selecting voltage adjacent rising edge zero cross points before the rectifier bridge input voltage and the rectifier bridge input inductance in a circle, and solving a rising edge zero cross point time difference; C, obtaining a wireless charging system work frequency, and measuring the rectifier bridge input inductance value; D, estimating the wireless charging system load according to the voltage rising edge zero cross point time difference before the rectifier bridge input voltage and rectifier bridge input inductance, the wireless charging system work frequency and the rectifier bridge input inductance value; E, randomly selecting a plurality of time slots of different durations, carrying out a statistics process on the wireless charging system load estimation results in the time slots, and obtaining an estimation value.

Description

technical field [0001] The invention relates to an estimation method of a wireless charging system, in particular to a method for estimating a load of a wireless charging system based on voltage detection at an input side of a rectifier bridge. Background technique [0002] Due to the advantages of no wire connection and space saving, wireless charging systems have received more and more attention, and have been introduced into electric vehicles, mobile phone charging, smart homes and other fields. In practical applications, the load of the wireless charging system will change, which will affect the performance and control strategy of the wireless charging system. Patent CN 104868572 A "wireless charging system and method" detects the voltage change on the load of the wireless charging system, but only uses the detected signal for output voltage control, and does not involve the problem of load estimation of the wireless charging system. Patent CN 106030966 A "Method for de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/10
CPCH02J50/10
Inventor 郭彦杰王丽芳李树凡张玉旺陶成轩张俊智李芳
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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