Wireless Charging Receiver Circuit With Fewer Switches and Lower Power Loss
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Solution Overview
Problem
Current wireless charging systems face inefficiencies in power conversion due to the need for multiple switches in the power conversion path from the coil to the connection node, leading to high power loss and low conversion efficiency.
Innovation Solution
A wireless charging receiving circuit with a reduced number of switches by using a control unit to manage the conduction state of switch units, allowing the voltage at the connection node to be an integer multiple of the coil voltage, thereby minimizing power loss and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switches are used in the power conversion path from the coil to the connection node, then the voltage conversion ratio can be increased, but the power loss increases and conversion efficiency decreases
Solution Approach 1:
The patent combines the wireless charging receiver and boost charge pump into a single integrated circuit chip, merging previously separate components (receiver, rectifier, voltage multiplier, regulator) into one unified structure. This integration reduces the number of external switches and connection nodes, thereby minimizing power loss while maintaining flexible voltage conversion ratios through internal circuit design.
2Power
If multiple switches are used in the power conversion path, then higher output voltage can be achieved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions (rectification, voltage multiplication, regulation) into a single charge pump circuit block, reducing the number of discrete components and switches. This integration simplifies the overall circuit structure while maintaining the capability to achieve high output voltages through the internal configuration of the charge pump stages.
Solution Approach 2:
The charge pump circuit is designed to perform multiple functions (voltage rectification, multiplication, and regulation) within a single integrated structure. This multi-functional design reduces circuit complexity by eliminating the need for separate circuits for each function, while still achieving the required high output voltage levels.
3Loss of energy
If the charge pump is placed close to the wireless charging receiving coil, then resistive power loss is minimized, but the current handling capability is reduced
Solution Approach 1:
The patent combines the wireless charging receiver and charge pump into a single integrated chip located close to the receiving coil. This integration minimizes the length of PCB traces and connection nodes, reducing resistive power loss. The internal current paths within the integrated circuit are optimized to handle the required current levels despite the close proximity to the coil.
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 improves power conversion efficiency by reducing the number of switches in the charging path, resulting in lower power loss and higher conversion efficiency compared to traditional systems.
Implementation Method 1
Since the energy is transmitted by the wireless charging transmitter in the form of a magnetic field, a wireless charging receiver must be used to convert the magnetic field energy into electrical energy.
Data Source
AI summary
A wireless charging receiving circuit includes a coil, a first energy storage unit, a second energy storage unit, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a filter unit, and a control unit. The coil is connected to the first energy storage unit, the second switch unit and the third switch unit. The first energy storage unit and the first switch unit are connected to the fifth switch unit, and the first switch unit is connected with the filter unit and the fourth switch unit at a first connection node. The fourth switch unit is connected with the second switch unit and the second energy storage unit, and the second energy storage unit is connected with the fifth switch unit, the sixth switch units and the coil.