Wireless Power Inverter Mode Switching for Charging Efficiency
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies and long charging times due to their limited capacity in supporting larger mobile devices with higher battery capacities, particularly in transitioning from low-power to medium-power transmission without causing malfunctions or overheating in low-power reception devices.
Innovation Solution
A wireless power transmission device that includes a power conversion unit with an inverter capable of operating in half-bridge or full-bridge modes, switching between these modes based on the detected power level of the reception device, and a communications and control unit that adjusts the operating frequency and duty cycle to prevent overload and ensure stable power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless charging systems use low-power transmission mode, then compatibility with existing devices is maintained, but charging time increases and efficiency decreases for larger devices with higher battery capacities
Solution Approach 1:
The system dynamically switches between half-bridge mode (for low-power transmission compatible with existing devices) and full-bridge mode (for medium-power transmission to larger devices). The communications and control unit detects the reception device type and adjusts the inverter operation mode accordingly, enabling the system to adapt its power transmission capability based on device requirements.
Solution Approach 2:
The patent changes the operating parameters of the inverter by switching between half-bridge and full-bridge configurations. This parameter change allows the system to transmit either low power (maintaining compatibility) or medium power (improving charging speed for larger devices), resolving the contradiction between adaptability and productivity.
2Productivity
If wireless charging systems use medium-power transmission mode, then charging efficiency improves for larger devices, but risk of overheating and malfunction increases for low-power reception devices
Solution Approach 1:
The communications and control unit performs preliminary detection of the reception device type before initiating power transmission. Based on this detection, the system pre-configures the inverter in the appropriate mode (half-bridge for low-power devices, full-bridge for medium-power devices), preventing overheating and malfunction by ensuring the transmission power matches the device's capabilities.
Solution Approach 2:
The system uses feedback from the reception device (through communication protocols) to determine device type and power handling capability. The communications and control unit continuously monitors transmission conditions and adjusts the inverter mode accordingly, creating a closed-loop control system that prevents harmful effects while maintaining high efficiency when appropriate.
3Power
If the inverter operates in full-bridge mode, then power transmission capacity increases for medium-power devices, but system complexity and control difficulty increase
Solution Approach 1:
The patent segments the inverter operation into two distinct modes: half-bridge mode for low-power transmission and full-bridge mode for medium-power transmission. Each mode has its own optimized control parameters and operating characteristics. The communications and control unit manages these segmented modes by selecting the appropriate one based on device detection, simplifying the overall control architecture while maintaining high power capability when needed.
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
Enables efficient power supply to both low-power and medium-power devices, preventing overheating and ensuring stable power transmission by identifying the reception device's power level and adjusting the inverter operation mode, thereby supporting faster and higher capacity charging.
Implementation Method 1
Electromagnetic induction is a power transfer method in which a power transmission part produces a magnetic field in a power transmitting coil (primary coil), and in which a receiving coil (secondary coil) is placed in a position where a current can be induced.
Implementation Method 2
a primary coil that creates a magnetic field
Data Source
AI summary
A wireless power transfer device includes an inverter configured to convert DC input to an AC waveform that drives a resonant circuit, a primary coil configured to generate a magnetic field, a shield material placed below the primary coil, a current sensor configured to monitor current in the primary coil, and a communications and control unit configured to communicate with a wireless power receiver device and control power transfer, wherein the primary coil consists of a single layer of which a number of turns is 12, and consists of 105 strands Litz wire of which the diameter is 0.08 mm, wherein the shield material is at least 1.5 mm thick and extends at least 2.5 mm beyond the outside of the primary coil, and wherein the primary coil and the shield material has a self-inductance 10.0 μH.