Bi-Level Dimming Controller With Variable Impedance Circuit
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Solution Overview
Problem
Existing bi-level lighting control systems face compatibility issues with different lighting drivers due to impedance incompatibility, require separate low-voltage wiring, and struggle to seamlessly switch between preset dimming levels and full-on lighting, making them costly and impractical for installations.
Innovation Solution
A bi-level dimming controller with a dimming preset selector, variable impedance dimming control circuit, and isolated dimming enable circuit that maintains a constant dimming voltage output regardless of current or impedance changes, allowing for seamless switching between dimming levels and full-on lighting using a detection signal, and can be powered by line voltage, eliminating the need for separate low-voltage conduits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prior art 0-10 VDC dimming controller provides a dimming input signal based on an expected input impedance, then the controller can operate with standard drivers, but the driver output signal may provide a brighter or dimmer light level than expected due to impedance incompatibility
Solution Approach 1:
The patent implements a dynamic impedance matching circuit that automatically adjusts the output impedance of the dimming controller to match the input impedance of the connected driver. This dynamic adjustment ensures that the voltage signal delivered to the driver is always accurate, regardless of driver variations, thereby maintaining precise light level control while being compatible with different driver types.
Solution Approach 2:
The patent changes the electrical parameter (impedance) of the dimming controller's output circuit based on the connected driver's characteristics. By measuring or detecting the driver's input impedance and adjusting the controller's output impedance accordingly, the system maintains accurate voltage signaling and precise dimming control across different driver models and configurations.
2Reliability
If bi-level lighting controllers require a minimum load to function as expected, then the controller can maintain stable operation, but the system requires three or more light drivers coupled to the controller
Solution Approach 1:
The patent introduces an intermediary circuit between the controller and the driver that provides virtual load impedance. This intermediary circuit simulates the presence of additional drivers by generating appropriate current signals, allowing the controller to operate stably even when only one or two physical drivers are connected, thereby eliminating the minimum load requirement while maintaining operational reliability.
3Reliability
If separate low and high voltage conduits are run to each light fixture for code compliance, then the installation meets electrical safety requirements, but the installation cost increases and the process becomes impractical for retrofitting
Solution Approach 1:
The patent merges the low-voltage dimming control function with the existing high-voltage power wiring by using the power conductor as both power delivery and control signal return path. This is achieved through isolated DC-DC conversion and ground-referenced signaling that allows the control circuit to share the power wiring infrastructure, eliminating the need for separate low-voltage conduits while maintaining code compliance through proper isolation and grounding practices.
4Adaptability or versatility
If a bi-level controller from one manufacturer is used with a driver from another manufacturer, then different electrical configurations cause impedance mismatches, but the lighting output will be different than expected
Solution Approach 1:
The patent implements an impedance detection and adaptation circuit that measures the input impedance characteristics of the connected driver and dynamically adjusts the output impedance of the bi-level controller. This parameter matching ensures that voltage signals are accurately delivered regardless of manufacturer differences, maintaining expected lighting output levels across cross-manufacturer configurations.
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 compatibility with various lighting drivers, reduces installation costs by eliminating the need for separate low-voltage wiring, and provides efficient energy management by maintaining consistent lighting levels across different configurations.
Implementation Method 1
an isolated DC-DC converter electrically isolated from the high-voltage power source
Data Source
AI summary
An illustrative bi-level dimming controller for coupling to a dimming control input of a lighting driver includes a dimming preset selector for setting a preset dim level, and a dimming control circuit having variable impedance and providing a constant dimming voltage output for a preset dim level, even if the current supplied to or impedance coupled to the dimming controller changes. The dimming control circuit is responsive to the preset dim level to drive a dimming voltage output proportional to the preset dim level. The dimming controller may also include a dim enable circuit responsive to a detection signal to selectively couple and uncouple the dimming signal output with the dimming control input of the lighting driver, thereby providing switching between a preset dim level and a full light level. The detection signal may be electrically isolated from the dimming voltage output.