Wireless Power Transmitter Mode Switching for Kitchen Appliances
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Solution Overview
Problem
Existing wireless power transfer systems for high power kitchen appliances face challenges such as complexity, high cost, and suboptimal dynamic performance, particularly in achieving electromagnetic compatibility and supporting very low-cost devices.
Innovation Solution
A power transmitter system that employs two operational modes: a first mode with a power control loop for accurate power provision and a second mode with setpoints for reduced complexity and cost, along with a timing circuit to adapt communication time intervals and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a power control loop is used to control power transfer in response to power control error messages, then power transfer accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system dynamically switches between two operational modes: a first mode with a power control loop for accurate power provision, and a second mode with setpoints for reduced complexity. The timing circuit adapts communication time intervals based on the operating mode, enabling the system to optimize between accuracy and complexity requirements.
2Reliability
If communication time intervals are extended to improve communication reliability, then electromagnetic interference increases, but if communication time intervals are reduced, then communication reliability decreases
Solution Approach 1:
The timing circuit implements periodic action by extending communication time intervals during periods when power transfer is reduced or suspended. This periodic scheduling allows communication to occur in dedicated time slots, improving reliability while limiting electromagnetic interference to specific time windows rather than continuous operation.
3Ease of operation
If wireless power transfer is used to eliminate physical electrical connections, then ease of operation is improved, but electromagnetic interference increases
Solution Approach 1:
The system uses periodic action by implementing alternating power transfer time intervals and communication time intervals. During communication time intervals, power transfer is reduced or suspended, which limits electromagnetic interference while maintaining the wireless convenience. This periodic scheduling allows the system to achieve ease of operation without continuous electromagnetic interference.
4Adaptability or versatility
If the system supports both high-complexity and low-complexity devices, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system implements universality by incorporating a timing circuit that can adapt communication time intervals based on the operational mode and device requirements. This single timing circuit serves multiple functions: managing communication scheduling, adapting to different device complexities, and coordinating between power transfer and communication operations, thereby supporting both high-complexity and low-complexity devices without requiring separate specialized circuits for each device type.
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 system achieves improved performance by supporting both high-complexity and low-complexity devices, reducing cost and complexity, and enhancing electromagnetic compatibility while maintaining efficient power transfer.
Implementation Method 1
power is inductively transferred from a transmitter inductor in a power transmitter device to a receiver coil in the individual devices
Implementation Method 2
a driver arranged to generate a drive signal for the transmitter coil to generate the power transfer signal
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
:A power transmitter (101) provides power to a power receiver (105) via a power transfer signal generated by a drive signal fed to a transmitter coil (103). A first controller (209) of the power transmitter (101) controls a parameter of the drive signal in accordance with a first mode which comprises operating a power control loop to control the power transfer signal in response to power control error messages received from the power receiver (105). A second controller (211) controls the parameter of the drive signal in accordance with a second mode which comprises setting the parameter of the drive signal in response to at least one power transfer signal setpoint received from the power receiver (105). A circuit (213) selects between the first mode of operation and the second mode of operation in response to a power transfer control mode request received from the power receiver (105) and a timing circuit (215) varies a timing parameter for the communication time intervals between the two modes of operation.