Wireless Charging Receiver Circuit for Integrated CC-CV Control
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Solution Overview
Problem
Existing wireless charging systems require an extra battery management circuit to control charging modes, which increases cost and complexity, especially in applications like roadside charging stations for electric vehicles.
Innovation Solution
A wireless charging system that eliminates the need for an extra battery management circuit by using a bidirectional switch in the receiver circuit to automatically select Constant Current (CC) or Constant Voltage (CV) charging modes, and synchronizes switching signals with the transmitter circuit without wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an extra battery management circuit is used to control charging modes, then charging mode control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the battery management circuit functions directly into the receiver circuit, merging the functions of wireless power reception and battery charging control into a single integrated circuit structure. This eliminates the need for separate battery management circuits while maintaining charging mode control accuracy through unified control logic that monitors battery voltage and current to automatically switch between CC and CV modes.
Solution Approach 2:
The receiver circuit is designed to perform multiple functions: it receives wireless power through the secondary coil, rectifies the power, monitors battery charging parameters, and automatically controls charging modes. This multi-functional design eliminates the need for dedicated battery management circuits while maintaining precise charging control through integrated voltage and current sensing capabilities.
2Reliability
If wireless communication is used for handshaking between Tx and Rx, then communication reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the handshaking communication function into the power transfer circuit by utilizing the existing signal paths and control logic already present in the wireless power transfer system. The controller uses the same communication interface for both power transfer coordination and handshaking protocols, eliminating the need for separate communication circuits while maintaining reliable device identification and compatibility verification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces costs and complexity by eliminating the need for an extra battery management circuit, while maintaining efficient energy transfer and accurate charging mode selection, thus enhancing the practicality of wireless charging systems, especially for high-power applications like electric vehicle charging.
Implementation Method 1
a primary coil connected in series with a first resonant capacitor... a secondary coil connected in series with a second resonant capacitor
Implementation Method 2
a primary coil connected in series with a first resonant capacitor... a secondary coil connected in series with a second resonant capacitor
Implementation Method 3
a secondary coil connected in series with a second resonant capacitor and a diode rectifier
Data Source
AI summary
Provided is coordinated control and use of a transmitter circuit and a receiver circuit for wireless battery charging, with emphasis on using power switches in the receiver circuit not only for handshaking with the transmitter circuit for compatibility check and communication of information but also for charging mode control of the battery. It utilizes extra switching operations of power switches in the receiver circuit (such as those commonly used in the Qi standard for handshaking with the transmitter circuit) to charge the battery directly from the output of the rectifier with the constant-current mode or constant-voltage mode according to a threshold battery voltage without using an extra battery management circuit between the rectifier of the receiver circuit and the battery. Coordinated operations of the transmitter and receiver circuits can be achieved without using any extra wireless communication system for signal synchronization between the two circuits.