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Single-Switch Inverter Modular Parallel Multi-Voltage Levels Wireless Charging System for Robots.

Hua Li1,2, Zhiyuan Sun3, Lianfu Wei1

  • 1School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China.

Sensors (Basel, Switzerland)
|January 10, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel wireless charging system for robots using frequency modulation. The system efficiently charges lithium batteries with constant current (CC) and constant voltage (CV) modes, enhancing device interoperability.

Keywords:
constant current and voltage outputsmodular parallelmulti-voltage levelssingle-switch inverterwireless charging (WC)

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Area of Science:

  • Robotics
  • Electrical Engineering
  • Power Electronics

Background:

  • The growing robotics industry necessitates versatile wireless charging solutions for diverse robot types.
  • Existing single wireless systems struggle to accommodate varying power demands and device specifications.
  • Interoperability and efficient charging are critical challenges in modern robotics applications.

Purpose of the Study:

  • To propose and validate a single-switch inverter module wireless charging system with variable voltage output.
  • To achieve enhanced interoperability between different robotic devices through a unified charging platform.
  • To ensure efficient and complete charging of lithium batteries using constant current (CC) and constant voltage (CV) modes.

Main Methods:

  • Implementation of a single-switch inverter module utilizing parallel module number frequency modulation (FM).
  • Development of a simplified equivalent circuit model for system analysis and input voltage source expression.
  • Design and prototyping of a three-module parallel configuration system for experimental validation.
  • Analysis of amplitude-frequency characteristics for voltage gain optimization in constant voltage (CV) mode.

Main Results:

  • The prototype system successfully demonstrated constant current (CC) and constant voltage (CV) outputs suitable for lithium battery charging.
  • Variable voltage output was achieved through frequency modulation (FM), verifying the system's flexibility.
  • Maximum system efficiency reached 91.3%, indicating efficient power transfer.
  • The system exhibited superior performance in full charging, stable CV phase output, and flexible multi-voltage capabilities compared to existing solutions.

Conclusions:

  • The proposed single-switch inverter wireless charging system effectively addresses the need for interoperable charging in the robotics industry.
  • The frequency modulation (FM) approach enables precise control over voltage output, meeting diverse charging requirements.
  • The system's high efficiency and ability to provide both CC and CV modes make it a significant advancement for lithium battery charging in robotic applications.