Wireless LED Driver with Feedback Control for Voltage Stability
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Solution Overview
Problem
Existing wireless power supply technologies face challenges in efficiently and reliably driving light-emitting diodes (LEDs) wirelessly, particularly in maintaining minimum voltage levels and providing constant current, especially when multiple LEDs are connected, due to variations in coupling degrees and power transfer efficiency.
Innovation Solution
A wireless LED driver system comprising an electrical energy transmitter with an inverter circuit and transmitter coupling circuits, and an electrical energy receiver with rectifier and power converter circuits, utilizing impedance matching and control signals to ensure efficient AC-DC conversion and constant current delivery to LEDs, with communication protocols for feedback control to maintain minimum voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power supply is used to drive LEDs, then convenience and safety are improved, but maintaining minimum voltage levels and providing constant current becomes difficult due to coupling variations
Solution Approach 1:
The patent implements feedback control mechanisms where the controller monitors output voltage and current parameters, compares them against reference values, and adjusts the duty cycle of switching elements accordingly. This closed-loop feedback system ensures that despite variations in coupling degree between transmitter and receiver coils, the LED receives stable voltage and constant current, resolving the reliability issue while maintaining wireless operation convenience
Solution Approach 2:
The system dynamically adjusts operating parameters in real-time based on load conditions and coupling variations. The controller modifies switching frequencies and duty cycles adaptively to maintain optimal power transfer efficiency and ensure minimum voltage thresholds are met, allowing the system to respond dynamically to changing conditions rather than operating at fixed parameters
2Illumination intensity
If multiple LEDs are connected in parallel, then illumination coverage is improved, but power distribution uniformity deteriorates due to different coupling degrees
Solution Approach 1:
The patent divides the multiple LED loads into separate parallel branches, each with its own current-limiting resistor and switching element. The controller independently controls each branch's duty cycle based on individual current feedback, allowing segmented management of each LED group. This segmentation enables differentiated power distribution to compensate for varying coupling degrees, ensuring uniform power delivery across all LED groups while maintaining broad illumination coverage
Solution Approach 2:
The system applies local quality control by providing customized current regulation to each LED branch based on its specific coupling characteristics. Each branch receives tailored control parameters (duty cycle, switching frequency) optimized for its local conditions, rather than applying uniform control to all branches. This localized control strategy ensures that LEDs with different coupling degrees receive appropriate power levels, achieving overall power distribution uniformity
3Device complexity
If simple wireless power transfer is used, then device complexity is reduced, but power conversion efficiency and voltage regulation deteriorate
Solution Approach 1:
The patent employs parameter change strategies by dynamically adjusting switching frequency and duty cycle based on load conditions and power transfer efficiency requirements. The controller monitors output parameters and modifies operating frequency and pulse width to optimize power conversion efficiency across different operating points. This adaptive parameter adjustment maintains high efficiency without requiring complex hardware modifications, balancing simplicity with performance
Solution Approach 2:
The system replaces complex mechanical or hardware-based voltage regulation mechanisms with electronic control methods. Instead of using variable transformers or mechanical regulators, the patent uses pulse-width modulation (PWM) and frequency modulation through solid-state switching elements to achieve voltage regulation and efficiency optimization. This substitution maintains relatively simple device structure while significantly improving power conversion efficiency and voltage regulation capability
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 ensures stable and efficient power delivery to LEDs by regulating output power and voltage, maintaining constant current and ensuring all LEDs operate within predetermined voltage thresholds, even when multiple receivers are connected, thereby improving overall efficiency and reliability.
Implementation Method 1
an inverter circuit coupled to receive an input power supply, and being configured to convert a received voltage signal to an AC signal
Implementation Method 2
N transmitter coupling circuits coupled to the inverter circuit, and being configured to be driven by the AC signal; an electrical energy receiver comprising M receiver coupling circuits coupled to the transmitter coupling circuits in a contactless mode
Implementation Method 3
M rectifier circuits coupled to the receiver coupling circuits one by one, where each the rectifier circuit is configured to convert the AC signal to a DC signal
Data Source
AI summary
A wireless LED driver can include: an electrical energy transmitter comprising an inverter circuit coupled to receive an input power supply, and being configured to convert a received voltage signal to an AC signal; the electrical energy transmitter comprising N transmitter coupling circuits coupled to the inverter circuit, and being configured to be driven by the AC signal; an electrical energy receiver comprising M receiver coupling circuits coupled to the transmitter coupling circuits in a contactless mode, and being configured to receive the AC signal; and the electrical energy receiver comprising M rectifier circuits coupled to the receiver coupling circuits one by one, where each the rectifier circuit is configured to convert the AC signal to a DC signal to drive an LED load coupled to output terminals of the rectifier circuit, and where N and M are integers not less than 1.