Current Mode Switcher for LED High-Voltage Integration
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Solution Overview
Problem
LED lights require power converters to operate with high-voltage supply lines, increasing cost and complexity, and face challenges in current control due to varying conditions such as number of lights or supply voltage.
Innovation Solution
A current mode switcher with a novel switch mode control topology that includes LEDs coupled in series with an inductor and capacitor, a recirculation diode, and a power transistor controlled by PWM, using LED regulation circuitry with a comparator and latch to manage peak current and prevent overvoltage or overheating, allowing direct connection to high-voltage supply lines and precise current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power converters are used to enable LED lights to operate with high-voltage supply lines, then LED lights can be connected to high-voltage supply lines, but the cost and installation complexity increase
Solution Approach 1:
The patent extracts the power conversion function from separate external components and integrates it directly into the LED light module itself. The LED light includes an integrated power converter that can directly process high-voltage input (115V or 230V) and convert it to appropriate voltage for LED operation, eliminating the need for external power converters and reducing installation complexity.
Solution Approach 2:
The LED light module is designed with multi-functionality to operate directly with high-voltage supply lines. The integrated power converter enables the LED light to universally accept standard high-voltage inputs (115V or 230V) without requiring external conversion equipment, making the LED light itself a self-contained universal power solution.
2Adaptability or versatility
If varying conditions (number of lights or supply voltage) are allowed, then LED lights can be flexibly configured, but current control becomes more difficult
Solution Approach 1:
The patent incorporates feedback control mechanisms within the integrated power converter to monitor and adjust the current through the LEDs. The controller receives feedback about the actual current flow and supply voltage conditions, then dynamically adjusts the power conversion parameters to maintain precise current control despite variations in configuration or input voltage.
Solution Approach 2:
The power converter is designed with dynamic control capabilities that allow it to adapt in real-time to changing conditions. The controller can dynamically adjust operating parameters based on the number of LEDs in series/parallel configurations and varying supply voltage levels, maintaining optimal current control across different operational states.
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
Enables efficient and stable control of current through LEDs, reducing the need for external control loops and lowering costs by using low-voltage integrated circuits, while maintaining precise control and stability across varying conditions.
Implementation Method 1
an inductor 104 and in parallel with a capacitor 106. Current flowing through the LEDs 102a-102n also flows through the inductor 104.
Implementation Method 2
an inductor 104 and in parallel with a capacitor 106
Implementation Method 3
A recirculation diode 108 is coupled in parallel with the circuit path containing the LEDs 102a-102n, the inductor 104, and the capacitor 106
Implementation Method 4
A power transistor 110 is coupled to the inductor 104. The power transistor 110 generally controls the flow of current through the LEDs 102a-102n
Data Source
AI summary
A system includes a first transistor configured to control a current through one or more LEDs and an inductor coupled in series with the one or more LEDs. The system also includes a current mode switcher configured to control the first transistor so that the inductor has a substantially constant ripple current. The system may further include a resistor and a second transistor coupled across the one or more LEDs and an integrating capacitor coupled in series with the second transistor. The switcher may include a driver configured to drive the first transistor to turn the first transistor on and off. The switcher may also include a detector configured to turn off the first transistor when a current through the first transistor exceeds a first threshold. The switcher may further include a timer configured to turn on the first transistor when a voltage on the integrating capacitor exceeds a second threshold.