LED Current Control Circuit for Temperature-Dependent Luminous Flux Compensation
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Solution Overview
Problem
Existing LED light control circuits do not effectively account for the temperature-dependent decrease in luminous flux, leading to increased energy consumption and potential glare at colder temperatures, and can cause overheating due to constant current supply.
Innovation Solution
A circuit that adjusts the electrical current supplied to LEDs based on temperature, providing a lower current in lower temperature intervals and a constant current in higher intervals to compensate for luminous flux changes and prevent overheating, while allowing for energy-saving operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant current is supplied to LED, then LED operates reliably, but energy consumption increases and luminous flux becomes excessive at low temperatures
Solution Approach 1:
The patent applies dynamics by transitioning from constant current supply to temperature-dependent variable current supply. The control circuit dynamically adjusts the LED current based on real-time temperature measurements, reducing current at low temperatures and maintaining it at high temperatures, thereby optimizing energy consumption while preserving LED reliability across different operating conditions
Solution Approach 2:
The patent implements parameter changes by modifying the electrical current parameter as a function of temperature. The control circuit changes the current magnitude based on temperature thresholds, creating a piecewise current profile that adapts to thermal conditions. This parameter adaptation resolves the contradiction by allowing current to vary within safe operating limits while minimizing energy waste
2Use of energy by moving object
If current is reduced at low temperatures to save energy, then luminous flux is optimized, but LED may overheat at high temperatures without compensation
Solution Approach 1:
The patent employs feedback through a temperature sensor that continuously monitors LED temperature and feeds this information to the control circuit. The control circuit uses this feedback to adjust the current supply in real-time, reducing current when temperature is low and maintaining or reducing it when temperature is high, thereby preventing overheating while optimizing energy consumption across the full temperature range
Solution Approach 2:
The system implements self-service by using the LED's own temperature characteristics to control its operating parameters. The temperature sensor mounted on the LED housing provides self-diagnosis of thermal conditions, and the control circuit automatically adjusts current without external intervention, enabling the LED system to self-regulate its thermal and electrical operating points
3Illumination intensity
If temperature compensation is implemented, then luminous flux is maintained constant, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the temperature range into discrete intervals with defined current characteristics. The control circuit implements piecewise linear compensation by segmenting the temperature-current relationship into multiple linear segments, each valid within a specific temperature range. This segmentation approach maintains luminous flux constancy while keeping the control logic relatively simple through modular temperature range handling
Solution Approach 2:
The patent uses an intermediary approach by introducing a control circuit as a mediator between the temperature sensor and the LED current supply. This intermediary circuit processes temperature information and translates it into appropriate current adjustments, implementing temperature compensation without requiring direct complex interaction between sensor and LED driver, thereby managing system complexity through functional decomposition
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 circuit reduces energy consumption and prolongs LED lifespan by adjusting current supply according to temperature, maintaining optimal luminous flux and preventing thermal damage.
Implementation Method 1
The received temperature signal can, for example, correspond to a temperature detected by a temperature sensor, in particular the temperature of an LED or the ambient temperature of the light fixture
Implementation Method 2
The circuit uses the received temperature signal to provide an electrical current at the supply output such that there is a first, lower temperature interval and a second, higher temperature interval, with the circuit providing a lower current when the temperature is in the first temperature interval than when it is in the second
Implementation Method 3
The invention relates to a circuit for controlling a light, in particular an outdoor light, a headlight, a light for cold storage rooms or a vehicle light, with at least one LED as the light source
Data Source
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AI summary
The invention relates to a circuit for supplying power to a lamp with at least one LED as a light source, wherein the circuit has a signal input for receiving a temperature signal and an electrical supply output or a control signal output for controlling an electrical supply device with a supply output, wherein the supply output provides an electrical current to supply the LED of the lamp, and wherein the temperature signal corresponds to a temperature, wherein a first, lower temperature interval and a second, higher temperature interval exist, such that the circuit provides a lower current when the temperature is in the first temperature interval than when the temperature is in the second temperature interval.