Wireless Power Transmitter Inverter Segmentation for Multi-Receiver Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless charging technologies face limitations in efficiently charging multiple devices simultaneously and distinguishing between inductive-type and resonant-type receivers, leading to inefficiencies in power transmission and increased circuit complexity.
Innovation Solution
A wireless power transmitter with a main half-bridge inverter and multiple sub half-bridge inverters, utilizing phase-inverted and phase-controlled pulse signals to identify and communicate with wireless power receivers, enabling efficient charging of multiple devices by determining the type of receiver and adjusting power transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inverter is used for multiple coil cells, then device complexity is reduced, but the ability to charge multiple power receivers simultaneously and control power transmission to each coil cell is limited
Solution Approach 1:
The patent divides the single inverter into multiple independent half-bridge inverters, each connected to a separate coil cell. This segmentation allows each inverter to independently control power transmission to its associated coil cell, enabling simultaneous charging of multiple power receivers while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The patent implements dynamic control where the communications and control unit can independently adjust the operation of each half-bridge inverter based on the presence and requirements of power receivers. The system dynamically enables or disables specific inverters and adjusts pulse signals according to real-time conditions, optimizing power distribution across multiple coil cells.
2Power
If electromagnetic induction is used for wireless charging, then power transfer is achieved, but the system cannot distinguish between inductive-type and resonant-type receivers, leading to reduced charging efficiency
Solution Approach 1:
The patent employs feedback mechanisms where the communications and control unit receives responses from power receivers and uses this information to identify receiver types. By analyzing the response characteristics and mode information from each receiver, the system determines whether the receiver is inductive-type or resonant-type and adjusts the pulse signal phase and power transmission accordingly to optimize charging efficiency.
Solution Approach 2:
The patent changes operational parameters based on receiver type identification. For inductive-type receivers, the system applies phase-inverted pulse signals, while for resonant-type receivers, it uses phase-controlled pulse signals. This parameter adjustment optimizes the resonant frequency matching and power transfer efficiency for each specific receiver type.
3Power
If higher-power charging is implemented to meet growing demand, then charging speed increases, but power transmission efficiency decreases and circuit complexity increases
Solution Approach 1:
The patent applies local quality control by enabling each half-bridge inverter to independently optimize power transmission to its associated coil cell based on the specific requirements of the connected power receiver. This localized optimization ensures that each power transmission path operates at peak efficiency, preventing energy losses that would occur in a centralized high-power system.
Solution Approach 2:
The system uses periodic pulse signals with adjustable duty cycles and frequencies to transmit power. By controlling the timing and duration of pulse applications to each coil cell, the system achieves efficient power transfer at lower instantaneous power levels, reducing energy losses while maintaining effective charging throughput.
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 allows for efficient discovery and charging of multiple wireless power receivers, reduces circuit complexity, and supports both inductive and resonant modes, improving charging efficiency and compatibility with various devices.
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
Resonant coupling is the transmission of energy that uses resonance between a primary coil and a secondary coil, in which resonant mode energy is coupled between the coils as the primary coil and the secondary coil resonate at the same frequency.
Data Source
AI summary
A wireless power transmitter which is capable of charging a plurality of wireless power receivers is discussed. The wireless power transmitter includes a plurality of coil cells, a main half-bridge inverter to which a main pulse signal is applied, a plurality of sub half-bridge inverters to which a first sub pulse signal or a second sub pulse signal is applied, at least one current sensor configured to monitor a current, and a communications and control unit configured to control the pulse signals applied to the main half-bridge inverter and sub half-bridge inverters and communicate with the wireless power receivers.