LED Driver Circuit Temperature Compensation
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Solution Overview
Problem
LED bulbs face challenges with heat dissipation due to their closed architecture, which can lead to overheating and damage to the control chip, necessitating effective temperature management.
Innovation Solution
A light source driving circuit comprising a power converter and a controller that adjusts the average current flowing through the load based on ambient temperature sensing signals, reducing current when temperatures rise above a threshold to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED bulbs use closed architecture, then protection and compactness are improved, but heat dissipation deteriorates
Solution Approach 1:
The patent introduces a temperature detection circuit and control circuit as intermediaries between the LED light source and the power supply. The temperature detection circuit monitors the temperature of the LED light source, and the control circuit adjusts the driving current based on the detected temperature, thereby solving the heat dissipation problem while maintaining the closed architecture protection.
2Use of energy by moving object
If driving current is increased, then luminous efficiency is improved, but temperature control deteriorates
Solution Approach 1:
The patent employs dynamic current adjustment by the control circuit based on real-time temperature feedback. The driving current is not fixed but dynamically adjusted according to the detected temperature, allowing the system to optimize luminous efficiency while preventing overheating through adaptive current control.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature detection circuit continuously monitors the LED light source temperature and feeds this information back to the control circuit. The control circuit then adjusts the driving current accordingly, creating a closed-loop control system that balances luminous efficiency and temperature control.
3Reliability
If ambient temperature rises, then operating conditions worsen, but device complexity increases with temperature management
Solution Approach 1:
The patent enables the LED bulb to self-regulate its operating temperature through the integrated temperature detection and control circuits. The system automatically detects temperature changes and adjusts the driving current without external intervention, allowing the device to adapt to varying ambient conditions while maintaining reliable operation.
Data Source
AI summary
A method for powering a load by a light source driving circuit is disclosed. The method includes: acquiring a first sensing signal indicative of an average current flowing through the load; generating a first temperature detecting signal indicative of an ambient temperature of the light source driving circuit; and adjusting the average current flowing through the load based on the first temperature detecting signal and the first sensing signal to make the average current flowing through the load to be inversely proportional to the ambient temperature of the light source driving circuit if the ambient temperature of the light source driving circuit is between a first temperature threshold and a second temperature threshold.