LED Driver Circuit for Ballast Compatibility and Leakage Safety
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Solution Overview
Problem
LED lamps currently lack compatibility with both electronic ballasts and supplies, particularly failing to pass leakage current tests when using a single terminal connection, which poses safety risks and inefficiencies in energy usage.
Innovation Solution
A LED driving circuit is designed with a buck circuit to depress high-frequency alternating current, a rectifier circuit to convert AC to DC, a leakage current limit circuit to control the switch and ensure safety, and a signal sample circuit to bypass the leakage current limit when necessary, allowing compatibility with both electronic ballasts and supplies while preventing electrical shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single terminal connection is used for electronic supply, then the device complexity is reduced, but the leakage current test fails and safety is compromised
Solution Approach 1:
The patent implements a dynamic switching mechanism that adapts the circuit configuration based on the power supply type. When electronic ballast is detected, the circuit automatically switches to a configuration that allows leakage current testing. This dynamic adaptation resolves the contradiction by providing different connection topologies for different operating conditions without requiring permanent complex dual-terminal structures.
Solution Approach 2:
The patent introduces an intermediary switching circuit that mediates between the power supply input and the LED driving circuit. This intermediary component enables the system to dynamically reconfigure the electrical path, allowing single-terminal operation for simplicity while providing a tested path for leakage current detection when needed, thus resolving the safety-complexity contradiction.
2Adaptability or versatility
If high frequency alternating current is directly input to the LED driving circuit, then the electronic ballast compatibility is maintained, but the circuit components may be damaged due to high voltage
Solution Approach 1:
The patent incorporates a buck circuit that performs preliminary voltage reduction before the high frequency alternating current reaches the LED driving circuit. This preliminary action protects subsequent components from voltage damage while maintaining compatibility with electronic ballasts, resolving the contradiction between adaptability and component strength.
Solution Approach 2:
The buck circuit serves as an intermediary between the electronic ballast output and the LED driving circuit. It mediates the high frequency alternating current by reducing its voltage level, thereby protecting the LED components from voltage stress while still allowing the high frequency signal to drive the LEDs effectively.
3Reliability
If the leakage current limit circuit is always active, then safety is improved, but the high frequency alternating current from electronic ballast cannot be properly processed
Solution Approach 1:
The patent implements a dynamic control mechanism for the leakage current limit circuit that activates or deactivates based on the detected power supply type. When electronic ballast is detected, the circuit is deactivated to allow proper high frequency current processing. When electronic supply is detected, the protection circuit is activated. This dynamic behavior resolves the contradiction between continuous safety protection and adaptability to different power sources.
Solution Approach 2:
The signal sample circuit performs preliminary detection of the power supply type before the leakage current limit circuit takes effect. This preliminary action allows the system to pre-configure the appropriate circuit state, ensuring that the leakage current protection is only applied when appropriate, thus maintaining both safety and electronic ballast compatibility.
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 enables LED lamps to safely operate with electronic ballasts, pass leakage current tests, and reduce labor costs by allowing direct replacement of fluorescent tubes, while ensuring safety by preventing electrical shocks and efficient energy usage.
Implementation Method 1
the buck circuit depresses the high frequency alternating current and outputs a buck signal
Implementation Method 2
the rectifier circuit converts the buck signal or a low frequency alternating current into a direct current
Implementation Method 3
LED light source is a new generation of semiconductor light source
Data Source
AI summary
This disclosure relates to a LED driving circuit compatible with an electronic ballast and an electronic supply, and a LED lamp, which include a first input terminal receiving an alternating current, a second input terminal, a buck circuit connected with the first input terminal and the second input terminal, a rectifier circuit connected with the buck circuit, a leakage current limit circuit connected with the rectifier circuit, a constant current output circuit connected with the leakage current limit circuit, a signal sample circuit connected with the second input terminal and the leakage current limit circuit, and a switch connected with the leakage current limit circuit. When a high frequency voltage outputted by the connected electronic ballast is automatically depressed for protecting subsequent circuits, when connecting the electronic supply, it is satisfied with a single terminal and double terminals connecting a power, and the double terminals pass a leakage current test.