Wireless Power Control via Phase-Shifted AC Signals
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Solution Overview
Problem
Conventional wireless power control methods for devices with multiple transmission coils are complex and lack precision, leading to inefficient power control in wireless power transmission systems.
Innovation Solution
A wireless power control method and apparatus that utilize phase control of AC power signals across multiple transmission coils, allowing for precise control of total transmission power by varying the phase of AC power signals and maintaining equal driving voltages and pulse width modulation signal duties, enabling stable power supply across various devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional power control methods are applied to each transmission coil individually, then power control is achieved, but device complexity increases and power control precision degrades
Solution Approach 1:
The patent merges multiple independent power control circuits into a single controller that manages all transmission coils. Instead of having separate control systems for each coil, one controller generates phase-shifted square wave signals to drive multiple full-bridge circuits, thereby reducing device complexity while maintaining precise power control through unified phase management.
Solution Approach 2:
The single controller performs multiple functions: it generates driving signals for all transmission coils, controls power distribution to multiple full-bridge circuits, and manages phase shifts for power adjustment. This multi-functional approach eliminates the need for separate control circuits for each coil, reducing overall system complexity while preserving control precision.
2Adaptability or versatility
If multiple independent control circuits are used for each transmission coil, then individual coil control is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple control functions into a single controller unit that manages all transmission coils. This merger reduces the number of control circuits needed, directly lowering component count and manufacturing cost while maintaining the ability to control each coil individually through phase-shifted signal generation.
Solution Approach 2:
The controller adjusts power distribution by changing phase parameters of driving signals rather than using separate control circuits. By varying phase shifts of square wave signals fed to different full-bridge circuits, the system achieves individual coil control capability through parameter modulation, reducing hardware complexity and manufacturing cost.
3Measurement precision
If phase control is implemented across multiple transmission coils, then total transmission power control precision is improved, but control system complexity increases
Solution Approach 1:
The patent introduces phase-shifted square wave signals as intermediaries to control power transmission. The single controller generates these phase-shifted signals that serve as mediators between the control system and multiple transmission coils. By adjusting the phase of these intermediary signals, precise total transmission power control is achieved without requiring complex direct control mechanisms for each coil.
Solution Approach 2:
The system controls total transmission power by changing phase parameters of driving signals. The controller varies phase shifts of square wave signals supplied to different full-bridge circuits, enabling precise power adjustment through simple parameter modification rather than complex control logic, thereby improving precision without proportionally increasing system complexity.
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 approach simplifies power control, reduces device complexity, and lowers manufacturing costs by allowing precise control of total transmission power through a single controller, effectively managing power supply to diverse wireless power receivers.
Implementation Method 1
wireless power transmission technology... using the principle of magnetic induction
Implementation Method 2
wireless power transmission or wireless energy transfer technology refers to technology of wirelessly transmitting electric energy from a transmitter to a receiver using the principle of magnetic induction
Data Source
AI summary
The present invention relates to a wireless power transmission method and apparatus therefor. A wireless power transmitter according to an embodiment may comprise: a plurality of transmission coils; an alternating current power generator for generating a plurality of alternating current power signals applied to the plurality of transmission coils; a power source for supplying direct current power to the alternating current power generator; and a controller for controlling the phases of the plurality of alternating current power signals, wherein the controller changes the phase of at least one of the plurality of alternating current power signals to control transmission power output through the plurality of transmission coils. Therefore, the present invention provides an advantage in that a wireless power transmitter including a plurality of transmission coils can more precisely control wireless power.