Digital Dimming LED Drive Circuit for Long Distance Lighting
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Solution Overview
Problem
Traditional DC 48V LED light circuits experience significant line voltage drops over long distances, leading to inconsistent brightness among LED lights in poultry breeding houses, affecting breeding efficiency.
Innovation Solution
A drive circuit for digital dimming LED lights, comprising a power module and a dimming module with a demodulation unit, a boosting constant voltage unit, and a constant current chopper unit, which adjusts the brightness of LED lights based on demodulated signals, maintaining consistent voltage and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional DC 48V LED light circuits are used in long breeding houses, then the circuit can cover long distances, but line voltage drop increases causing significant brightness difference among LED lights
Solution Approach 1:
The patent implements a dynamic compensation mechanism where each LED light module independently detects the input voltage and dynamically adjusts its operating parameters. The control module monitors the actual voltage received and dynamically regulates the current through the LED array, ensuring consistent brightness output regardless of distance from the power source. This dynamic adjustment resolves the contradiction by making each module adaptive to its local voltage conditions.
Solution Approach 2:
The patent changes the operating parameters of each LED light module based on the detected input voltage level. When voltage drop occurs due to long wire length, the module detects this change and adjusts its internal current regulation parameters accordingly. This parameter adaptation allows the system to maintain consistent brightness output across long distances, resolving the contradiction between circuit length and brightness consistency.
2Loss of energy
If voltage is increased to reduce current and minimize voltage drop, then line loss decreases, but LED lights may be damaged due to excessive voltage
Solution Approach 1:
The patent employs dynamic voltage detection and adaptive current control in each LED light module. Instead of using a fixed high voltage that could damage LEDs, the system dynamically detects the actual input voltage and adjusts the current through the LED array accordingly. This dynamic regulation ensures that the LEDs receive safe operating current levels while still compensating for line losses, resolving the contradiction between reducing energy loss and ensuring LED safety.
Solution Approach 2:
The patent implements a feedback mechanism where each LED light module detects its input voltage and uses this information to regulate its current consumption. The control module continuously monitors voltage levels and provides feedback control to maintain safe operating conditions. This feedback loop prevents overvoltage damage while optimizing current usage to minimize line losses, resolving the contradiction between energy efficiency and component safety.
3Illumination intensity
If more complex voltage compensation devices are added to maintain brightness consistency, then brightness uniformity improves, but device complexity and cost increase
Solution Approach 1:
The patent divides the lighting system into independent modular units, with each LED light module containing its own voltage detection and current control circuitry. This segmentation distributes the compensation function across multiple simple modules rather than requiring a single complex centralized control system. Each module operates autonomously to maintain its brightness, reducing overall system complexity while achieving consistent illumination across long distances.
Solution Approach 2:
The patent enables each LED light module to autonomously detect its input voltage and self-regulate its current consumption without external intervention. The modules perform their own voltage compensation, eliminating the need for complex external control devices or manual adjustments. This self-service approach maintains brightness consistency while minimizing device complexity and system cost.
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 solution ensures consistent brightness of LED lights across a wider input voltage range (20-60Vdc), effectively covering longer breeding house lengths (up to 150 meters), while reducing BOM costs by 40%.
Implementation Method 1
the power module is used to convert a utility power into DC power
Implementation Method 2
the power module is used to convert a utility power into DC power
Implementation Method 3
the voltage-boosting chip U2 outputs its own PWM signal to the voltage-boosting type DC/DC converter topology circuit, and controls the voltage-boosting type DC/DC converter topology circuit to output a constant voltage to the LED lights
Implementation Method 4
the constant current chopper unit is connected to the demodulation unit, and both the boosting constant voltage unit and the constant current chopper unit are connected to the LED lights, so that the voltage and current of the LED lights are constant
Implementation Method 5
both the boosting constant voltage unit and the constant current chopper unit are connected to the LED lights
Data Source
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AI summary
Disclosed is a drive circuit for a digital dimming LED light, relating to the LED light drive circuits, which includes a power module and a dimming module corresponding to the LED lights, wherein the dimming module comprises a demodulation unit, a boosting constant voltage unit and a constant current chopper unit, and the power module is used to convert a utility power into DC power and output it to the demodulation unit, and to receive an external dimming signal and modulate and convert it into a digital signal. The demodulation unit is connected to the power module for receiving and demodulating the digital signal, the constant current chopper unit is connected to the demodulation unit, and both the boosting constant voltage unit and the constant current chopper unit are connected with the LED lights, so that the brightness of the LED lights is consistent.