Light Driver Control for Thermal Cycle Life Preservation
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Solution Overview
Problem
The service life of power electronic devices and driver devices in luminaires is reduced due to excessive thermal cycles caused by frequent switching between standby and power-supplying modes, leading to increased energy consumption and maintenance costs.
Innovation Solution
A method and control circuit that introduce a lifetime-preserving mode, where operational parameters such as dim levels are adjusted to reduce temperature spread and number of thermal cycles, by evaluating parameters like switching frequency and historical data to determine when to switch into this mode, thereby extending the service life of the driver devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frequent switching between standby and power-supplying modes is implemented to reduce energy consumption, then energy efficiency is improved, but the number of thermal cycles increases which reduces service life
Solution Approach 1:
The system dynamically adjusts operational parameters based on real-time conditions. A control circuit monitors temperature and switching frequency, then adaptively modifies the number and duration of power-supplying mode intervals to balance energy savings with thermal stress accumulation, preventing excessive thermal cycling that would degrade component reliability
Solution Approach 2:
The invention changes operational parameters (power-supplying mode duration, frequency, and intensity) based on monitored conditions. When thermal stress thresholds are approached, the system modifies these parameters to reduce thermal cycle amplitude, thereby extending service life while maintaining acceptable energy efficiency
2Reliability
If the number of thermal cycles is reduced to extend service life, then reliability is improved, but energy consumption increases
Solution Approach 1:
Instead of completely avoiding power-supplying mode intervals, the system applies partial action by reducing their frequency and duration when thermal stress is high. This partial reduction in operational intensity sufficiently lowers thermal cycling to extend service life while avoiding the excessive energy consumption that would result from complete avoidance of power mode
3Reliability
If operational parameters are adjusted to reduce temperature spread, then service life is extended, but control complexity increases
Solution Approach 1:
The control circuit implements feedback by continuously monitoring temperature and switching frequency, then using this information to adjust operational parameters. This closed-loop control automatically reduces temperature spread through parameter modification without requiring complex external control systems, extending service life while keeping control complexity manageable
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 method effectively reduces the negative impact of thermal cycles on the service life of driver devices, achieving a balance between extended service life and moderate energy consumption by minimizing temperature spread and thermal stress.
Implementation Method 1
the electronic circuits create significant amounts of heat due to circuit losses while generating the required load currents for loads such as light modules
Implementation Method 2
an increased number of switching cycles or dim cycles of the power electronic devices driving the light modules of the luminaires also increases the number of thermal cycles the power electronic devices experience during a predetermined time
Data Source
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AI summary
Concerning the field of power electronics and lighting, the method for controlling at least one driver device, in particular a light driver, controls the at least one driver device to operate either in a standby mode or in a power-supplying mode. The method comprises obtaining a parameter value, evaluating the obtained parameter value to determine whether the obtained parameter value meets a lifecycle-criterion, and switching the at least one driver device into a lifetime-preserving mode in case the obtained parameter value meets the lifecycle criterion. In the lifetime-preserving mode, an adjustable value of at least one operational parameter of the at least one driver device is set to reduce a temperature spread of a device temperature of the at least one driver device. A control circuit for a driver device, e.g. a light driver, the driver device, a luminaire or a lighting system may implement the method.