LED Driving Circuit Protection Against Ballast Misapplication
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Solution Overview
Problem
The existing LED light tubes face safety risks due to misapplication or misconnection to ballasts, particularly with TYPE B wire shearing types, which can lead to damage and failure of electronic components, and pose safety hazards.
Innovation Solution
An LED driving circuit with a first AC input end, a second AC input end, a driving module, and a first protection unit that includes a voltage detection subunit and an abnormality cutoff subunit, which converts AC voltage to DC voltage and detects voltage abnormalities to cut off the circuit when high voltage is detected, preventing damage and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED light tube uses TYPE B wire shearing type design, then compatibility with AC power supply is improved, but safety risk increases due to misapplication to ballast
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the LED driving circuit and the power source. This protection circuit includes voltage detection and abnormality cutoff units that act as mediators to detect high voltage conditions and disconnect the circuit, preventing direct harm from ballast compatibility issues while maintaining the TYPE B design's AC power supply compatibility.
Solution Approach 2:
The patent implements preliminary protective measures by incorporating voltage detection and abnormality cutoff units before the LED driving circuit can be damaged. These units proactively detect high voltage conditions and disconnect the circuit in advance, preventing the harmful effects of misapplication to ballast before they occur.
2Device complexity
If LED light tube lacks voltage protection mechanism, then device complexity is reduced, but reliability deteriorates due to component damage risk
Solution Approach 1:
The patent adds voltage detection and abnormality cutoff units that perform preliminary protection before damage occurs. These units detect high voltage conditions and disconnect the circuit proactively, significantly improving reliability while adding minimal complexity compared to fully protected designs.
Solution Approach 2:
The protection circuit acts as an intermediary layer between the power source and the LED driving circuit. This intermediary detects abnormal voltage conditions and intervenes to disconnect the circuit, providing reliable protection without requiring complete redesign of the entire system.
3Ease of operation
If LED driving circuit is directly connected to ballast, then ease of operation is improved, but harmful factors increase due to high voltage damage
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the ballast and the LED driving circuit. This intermediary includes voltage detection and abnormality cutoff units that detect high voltage conditions and disconnect the circuit, preventing direct connection harm while maintaining the simple installation process of direct connection.
Solution Approach 2:
The protection circuit performs preliminary detection and protection before high voltage can damage the LED driving circuit components. By detecting abnormal voltage conditions and disconnecting the circuit in advance, it prevents harmful effects while maintaining ease of operation.
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 effectively disconnects the LED driving circuit from the power grid when high voltage is detected, preventing overvoltage and overcurrent, thus enhancing safety and compatibility with various illumination devices.
Implementation Method 1
the voltage detection subunit is connected in parallel between two corresponding voltage nodes of the driving module, and the voltage detection subunit is configured to detect a voltage value of the driving module
Implementation Method 2
the driving module is configured to convert an AC voltage inputted from the first AC input end and the second AC input end into a DC voltage
Implementation Method 3
The rectifying unit includes a first input end, a second input end, an output end and a grounding end
Data Source
AI summary
An LED driving circuit, a light tube and an illumination device are provided. The LED driving circuit includes a first AC input end, a second AC input end, a driving module, a first protection unit, a first DC output end and a second DC output end. The first protection unit includes a voltage detection subunit and an abnormality cutoff subunit, and the voltage detection subunit is connected in parallel between two corresponding voltage nodes of the driving module, and the voltage detection subunit is configured to detect a voltage value of the driving module; and the abnormality cutoff subunit is connected in series between the second input end of the driving module and the second AC input end; the first protection unit is configured to cut off a circuit of the driving module when a voltage abnormality of the driving module is detected.