Wireless Power Receiver Circuit Dynamic Voltage Control
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Solution Overview
Problem
Current wireless power receiving apparatuses face issues with reduced power supply efficiency and increased temperature due to varying operation environments and platforms, leading to inefficient power consumption and heat generation.
Innovation Solution
A power receiving control circuit that includes a rectifier circuit, smoothing capacitor, regulator, and controller, capable of adjusting the relation between charging current and rectified voltage based on temperature and external signals to optimize power supply efficiency and reduce heat generation, while conforming to standards like Qi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wireless power receiving apparatuses supply power to secondary batteries with stable voltage, then power supply stability is improved, but power supply efficiency is reduced and temperature increases
Solution Approach 1:
The patent implements dynamic adjustment of the rectified voltage target value based on charging current detection. The controller changes the relation between charging current and rectified voltage target value according to temperature conditions, allowing the system to adapt its operating parameters in real-time rather than maintaining a fixed stable voltage, thus resolving the contradiction between stability and efficiency
Solution Approach 2:
The patent changes the voltage parameter dynamically by adjusting the rectified voltage target value based on detected charging current and temperature conditions. This parameter change allows the system to optimize power supply efficiency while maintaining adequate stability for battery charging
2Stability of the object's composition
If wireless power receiving apparatuses supply power to secondary batteries with stable voltage, then power supply stability is improved, but temperature increases
Solution Approach 1:
The system dynamically adjusts the rectified voltage target value based on temperature detection. When temperature increases, the controller modifies the voltage-current relation to reduce power dissipation, thereby suppressing temperature increase while maintaining power supply stability
Solution Approach 2:
The patent implements feedback control by detecting the charging current value and temperature, then using this information to adjust the rectified voltage target value. This closed-loop feedback mechanism allows the system to respond to temperature changes and maintain stable operation without excessive heat generation
3Stability of the object's composition
If the rectified voltage target value is increased to maintain power supply stability, then power supply stability is improved, but power consumption increases
Solution Approach 1:
The patent optimizes the rectified voltage target value parameter based on actual charging conditions and temperature. By changing this parameter dynamically rather than maintaining a high fixed value, the system achieves adequate power supply stability with reduced power consumption
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
The solution stabilizes power supply efficiency, reduces power consumption, and effectively suppresses temperature increases by dynamically adjusting the charging current and rectified voltage, ensuring efficient operation across different environments and platforms.
Implementation Method 1
a reception coil 6, and a power receiving control circuit 100. The reception coil 6 receives an electric power signal S1 from the transmission coil 7
Implementation Method 2
a rectifier circuit 102, a smoothing capacitor 104, a linear regulator (LDO) 106, and a controller 108. The rectifier circuit 102 rectifies the coil current IRX
Data Source
AI summary
A power receiving control circuit is provided that receives AC coil current IRX from a reception coil and that supplies DC output voltage VOUT. A rectifier circuit rectifies the coil current IRX. A linear regulator receives a rectified voltage VRECT across a smoothing capacitor, and generates the output voltage VOUT stabilized to a predetermined target level. A controller has predetermined control characteristics configured as a relation between the value of a charging current ICHG and the target value of the rectified voltage VRECT. The controller detects the value of the charging current ICHG, and transmits information which indicates electric power to be transmitted from a wireless power supply apparatus, with reference to the control characteristics. The controller is configured to be capable of changing the control characteristics.