Monitor Device for Lighting Arrangement Power Measurement
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Solution Overview
Problem
Voltage-based lighting systems face challenges in accurately monitoring and managing the electrical load, leading to potential overloading and visual artifacts like flashing, especially when users can configure the lighting arrangement, which complicates precise current measurement and power estimation.
Innovation Solution
A monitor device that uses pulse width modulation to apply duty cycles to switches controlling lighting elements, detecting current plateaus within a duty cycle period to determine power consumption without individually measuring each sub-set, allowing for real-time adjustment to prevent overload and maintain consistent light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lighting load is probed by switching on different channels one by one to measure current contribution, then the power consumption can be determined, but visual flashing occurs and sudden load steps cause voltage dips
Solution Approach 1:
The patent applies periodic PWM (pulse width modulation) to control the switches, enabling the system to measure current at specific phases within each PWM period. This periodic action allows power consumption determination without continuously switching channels on and off, thereby avoiding visual flashing and voltage dips while maintaining accurate measurement capability.
Solution Approach 2:
The patent maintains continuous operation of all lighting channels simultaneously while measuring current at different time points within the PWM period. This continuous action eliminates the need to switch channels sequentially, preventing visual flashing and voltage dips, while still enabling accurate power consumption measurement through temporal current sampling.
2Adaptability or versatility
If voltage-based architecture is used for scalability, then ease of installation and flexibility are improved, but accurate current measurement and power estimation become difficult due to variable load
Solution Approach 1:
The patent implements a feedback mechanism where current is continuously monitored at multiple time points within the PWM period, and power consumption is calculated based on these measurements. This feedback loop enables accurate power estimation in voltage-based architectures with variable loads, allowing the system to adapt to different lighting configurations while maintaining measurement precision.
Solution Approach 2:
The patent uses dynamic PWM control to adjust duty cycles of individual channels based on real-time current measurements. This dynamic approach allows the system to handle variable loads in voltage-based architectures accurately, maintaining both scalability and measurement precision by adapting to changing lighting conditions.
3Measurement precision
If multiple current probes are used in each LED branch to enable accurate monitoring, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the current measurement function into a single monitoring point that measures total current drawn from the voltage source. By combining multiple measurement time points within the PWM period, the system achieves accurate power consumption measurement without requiring separate current probes for each LED branch, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent introduces PWM duty cycle control as an intermediary mechanism that enables indirect measurement of individual channel current contributions through temporal sampling of total current. This intermediary approach allows accurate power monitoring without direct current probes on each branch, simplifying the overall device 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
Enables accurate power monitoring and prevention of overloading without visual artifacts, ensuring the lighting system operates within safe power limits while maintaining user-defined light settings, thus enhancing reliability and user experience.
Implementation Method 1
A controller for providing control signals for controlling the switch arrangement using pulse width modulation, wherein the controller is adapted to: apply a set of duty cycles to the set of switches at the same time thereby to create a user-selected light output
Implementation Method 2
monitor the current at a plurality of times within an individual duty cycle period thereby to detect a plurality of current plateaus within the duty cycle period; determine a power consumption of the lighting arrangement based on the detected current plateaus and the set of duty cycles
Data Source
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AI summary
A monitor device is provided for monitoring a lighting arrangement of lighting elements of unknown electrical load, and a driver using the monitoring arrangement. A set of duty cycles is applied to switches which control sub-sets of lighting elements thereby to create a desired light output. With this desired duty cycle setting, the current for an individual duty cycle period is monitored, in particular to detect variations in a current plateau level 5 within the individual duty cycle period. This is used to determine a power consumption of the lighting arrangement and to adjust the duty cycles as a function of the detected current. This avoids the need to probe the sub-sets of lighting elements individually in order to determine the nature of the load and its power consumption.