LLC Circuit Over-Voltage Protection Feedback Control
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Solution Overview
Problem
Display devices face challenges in maintaining stable power supply due to increasing digital control requirements, leading to potential over-voltage issues that can affect the reliability and stability of the power source.
Innovation Solution
The implementation of an LLC circuit, transformer, and feedback circuit configuration in a display device that stabilizes voltage and includes an over-voltage protection method to prevent excessive voltage from reaching the electric load, ensuring the transformer stops supplying power when the voltage exceeds a preset working voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital control is implemented in power source, then control precision is improved, but stability deteriorates due to over-voltage issues
Solution Approach 1:
The patent implements a feedback circuit that samples the output voltage of the transformer and feeds it back to the control end of the LLC circuit. The control end compares the feedback voltage with a reference voltage and adjusts the driving signal accordingly to stabilize the output voltage, resolving the stability issue while maintaining digital control precision.
Solution Approach 2:
The patent incorporates an over-voltage protection circuit that proactively monitors the voltage before it can cause damage to the electric load. When over-voltage is detected, the protection circuit immediately stops the LLC circuit operation, preventing potential damage and ensuring power source reliability.
2Reliability
If voltage stabilization is implemented, then power source stability is improved, but device complexity increases
Solution Approach 1:
The feedback circuit serves multiple functions: it stabilizes the output voltage by regulating the LLC circuit operation and simultaneously provides over-voltage protection. This multi-functionality reduces the need for separate stabilization and protection circuits, thereby limiting the increase in device complexity while achieving both voltage stability and reliability.
3Reliability
If over-voltage protection is added, then reliability is improved, but device complexity increases
Solution Approach 1:
The over-voltage protection function is merged with the existing feedback and control circuits. The same feedback circuit that stabilizes voltage also detects over-voltage conditions and triggers protection by stopping the LLC circuit. This integration approach provides over-voltage protection without adding significant circuit complexity.
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
This configuration provides a stable power supply to the electric load, enhances the reliability of the power source, and prevents damage from over-voltage, thereby ensuring the normal operation of the display device.
Implementation Method 1
The transformer is configured to supply power to the LLC circuit and the electric load
Implementation Method 2
The feedback circuit is configured to provide a voltage derived from the second output end of the transformer to the LLC circuit. The LLC circuit is configured to stabilize the voltage supplied by the second output end of the transformer to the electric load based on the feedback voltage supplied by the feedback circuit
Data Source
AI summary
The present application is directed to a display device and an over-voltage protection method. As an example, the display device includes a power source assembly and an electric load. The power source assembly includes an LLC circuit, a transformer and a feedback circuit. An input end of the transformer is connected with a control end of the LLC circuit, a first output end of the transformer is connected with a supply end of the LLC circuit, a second output end of the transformer is connected with the electric load, and the transformer is configured to supply power to the LLC circuit and the electric load. A first end of the feedback circuit is connected with the second output end of the transformer, a second end of the feedback circuit is connected with the feedback end of the LLC circuit and the feedback circuit is configured to supply a voltage derived from the second output end of the transformer to the LLC circuit. The LLC circuit is configured to stabilize a voltage supplied by the second output end of the transformer to the electric load based on the feedback voltage supplied by the feedback circuit.