Voltage Interface Isolates Legacy Control Systems from LED Lighting
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Solution Overview
Problem
Legacy control systems in the greenhouse industry face challenges in regulating and controlling voltage supplied to LED lighting fixtures, leading to unstable light dimming and circuit failures due to mismatched current requirements and parallel circuit behavior.
Innovation Solution
A voltage interface system that isolates components using an optical isolator, allowing for independent control of current output to multiple light fixtures, operating in either sinking or sourcing configurations, and capable of supplying up to 750 milliamps per channel, thereby preventing catastrophic failures and ensuring stable dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple light fixtures are connected in parallel to a legacy control system, then the current capacity is increased, but the circuits become unstable and fail due to current flow between fixtures
Solution Approach 1:
The patent divides the parallel circuit into isolated channels using individual isolation circuits for each light fixture. Each channel operates independently with its own isolation circuit, preventing current flow between channels while maintaining the ability to drive multiple high-current fixtures simultaneously.
Solution Approach 2:
The patent introduces isolation circuits as intermediary components between the control system and each light fixture. These isolation circuits act as mediators that transfer control signals while blocking harmful current flow, enabling stable operation of multiple high-current fixtures.
2Device complexity
If a legacy control system supplies 0-10V directly to light fixtures, then the voltage control is simple, but the current cannot be regulated leading to unstable dimming
Solution Approach 1:
The patent introduces voltage-to-current conversion circuits as intermediary components that translate the simple 0-10V control signal into precise current control for the LED fixtures. This maintains the simplicity of the control interface while achieving stable current-regulated dimming.
Solution Approach 2:
The patent converts the voltage parameter (0-10V) into a current parameter through active conversion circuits. This parameter transformation enables precise current control that directly regulates LED brightness, providing stable dimming while maintaining compatibility with legacy voltage-based control systems.
3Reliability
If isolation circuits are added to each channel, then circuit reliability is improved, but the device complexity increases
Solution Approach 1:
The patent designs universal isolation circuit modules that can be replicated for each channel. Each module performs multiple functions including voltage-to-current conversion, channel isolation, and protection, reducing overall system complexity through standardization and modularity.
Solution Approach 2:
The isolation circuits are designed to be self-contained modules that automatically perform isolation and protection functions without requiring complex external control or configuration. Each channel independently manages its own isolation, simplifying the overall system architecture.
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 effectively stabilizes light dimming and prevents circuit failures by isolating voltage and current waves, allowing for independent control of light fixtures and ensuring reliable operation of LED lighting systems.
Implementation Method 1
The elements within the voltage interface may be configured to be electronically isolated from each other using an optical isolator
Data Source
AI summary
Examples of the present disclosure are related to systems and methods for voltage interfaces between legacy control systems and light sources. An example voltage interface may include a control loop including a first op-amp, an output loop including a second op-amp, and an optical isolator configured to electrically isolate the control loop from the output loop, the optical isolator being configured to receive an input signal from the control loop and transmit an output signal to the output loop.