MOSFET Array Modulation for Wireless Power and Data
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Solution Overview
Problem
Existing induction type power supply systems face issues with high power consumption during signal modulation, limited dynamic range, potential component damage due to sudden surges, and one-way signal transmission, which hinder efficient wireless power supplying and data transmitting capabilities.
Innovation Solution
The implementation of a power supplying and data transmitting method using a power supply module with a microprocessor, MOSFET arrays, and resonant circuits, along with a power-receiving module featuring a microprocessor, voltage detection circuits, and signal processing units, enabling bi-directional wireless transmission of electrical energy and data signals through resonant coils and carrier amplitude modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a load resistor is used for signal modulation in the induction type power supply system, then data feedback from secondary coil to primary coil is enabled, but power consumption during modulation increases significantly
Solution Approach 1:
The patent changes the modulation approach from using a load resistor to using MOSFET arrays that can dynamically adjust their on-resistance. By controlling the duty cycle and switching frequency of the MOSFETs, the system achieves signal modulation with much lower power consumption while maintaining reliable data transmission capability.
Solution Approach 2:
The patent replaces the passive resistor-based modulation system with an active MOSFET-based electronic control system. This substitution enables more efficient power management and dynamic adjustment of modulation parameters, significantly reducing power consumption during data transmission.
2Measurement precision
If the resistance value is reduced to amplify load effect during modulation for better signal analysis, then data analysis ability is improved, but the system approaches short-circuit status and no further adjustment is allowed
Solution Approach 1:
The patent employs MOSFET arrays with pulse-width modulation (PWM) control to dynamically adjust the equivalent resistance during modulation. This dynamic control allows the system to optimize signal analysis ability by adjusting the duty cycle, while the control circuit monitors system status to prevent approaching short-circuit conditions, maintaining system stability.
Solution Approach 2:
The patent implements feedback control where the primary coil analyzes the reflected impedance from the secondary coil to detect data signals. The control circuit adjusts the MOSFET switching parameters based on this feedback, optimizing the modulation depth for reliable data detection while preventing excessive current that would approach short-circuit status.
3Speed
If modulation is performed with high power, then signal transmission distance is extended, but sudden surges occur during modulation causing temperature rise that may damage circuit components
Solution Approach 1:
The patent uses periodic pulse-width modulation with MOSFET arrays to transmit modulation signals. By switching the MOSFETs in controlled pulses rather than continuous high power, the system achieves effective signal transmission while allowing heat dissipation during off-periods, preventing temperature rise and component damage.
Solution Approach 2:
The patent incorporates protection circuits including current limiting and temperature monitoring that activate before surge conditions can damage components. The MOSFET-based modulation system inherently provides soft-start capability and controlled ramp-up of power, cushioning against sudden surges that would otherwise cause temperature spikes and component failure.
4Stability of the object's composition
If a resistor load with filter capacitor is installed posterior to the rectifier for voltage stabilization, then voltage stability is improved, but signal modulation reaction speed is slowed down
Solution Approach 1:
The patent replaces the passive RC filtering system with an active voltage regulation system using MOSFETs and control circuits. The MOSFET-based voltage regulation responds much faster to load changes while maintaining voltage stability, eliminating the slow response inherent in RC time constants of traditional filter circuits.
Solution Approach 2:
The patent implements dynamic voltage regulation where the MOSFET switching frequency and duty cycle are adjusted in real-time based on load conditions. This dynamic control maintains voltage stability during modulation without requiring large RC time constants, thus preserving fast modulation reaction speed.
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 minimizes power loss, prevents component damage, allows simultaneous energy and data transmission without high carrier frequencies, and ensures reliable two-way signal transmission, enhancing the efficiency and stability of wireless power and data transfer.
Implementation Method 1
a power supply coil 181 that is adapted for transmitting electric energy and data signal... a power-receiving coil 251... connected to a resonant circuit
Implementation Method 2
two MOSFET arrays 122;123 that are respectively connected to a resonant circuit. The resonant circuit has connected thereto a power supply coil 181... The rectifier and filter circuit is connected to a resonant circuit 25. The resonant circuit 25 is connected to a power-receiving coil 251
Implementation Method 3
a carrier amplitude modulation circuit 231 of a signal processing unit 23
Data Source
AI summary
A power supply and data signal transmission method used in an induction type power supply system consisting of a power supply module and a power-receiving module for transmission of electrical energy and data signal is disclosed. The microprocessor of the power supply module scans the resonant point of the power supply coil to send a segment of energy for recognition of a feedback signal from the power-receiving module and then starts providing power supply after receipt of the feedback signal, and then runs further signal modulation, transmission, data decoding and other follow-up steps, achieving transmission of electrical energy and data signal wirelessly.