Logic Circuit With Variable Switching Speed for LCD EMI Control
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Solution Overview
Problem
Existing LCD products face excessive electromagnetic interference (EMI) issues due to uniform switching speeds in power management chips, which need to be addressed to meet market standards.
Innovation Solution
A logic circuit design incorporating a voltage adjusting control module and switching control module with multiple current sources in parallel, allowing for different operational currents and switching speeds for switch components, effectively dispersing EMI by varying the switching speeds of the switch components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform switching speed is used in power management chips, then circuit design is simple, but electromagnetic interference (EMI) becomes excessive
Solution Approach 1:
The patent applies dynamics by making the switching speed variable rather than fixed. The switching control module dynamically adjusts the switching speed of the switch component based on different working conditions, allowing the system to adapt switching frequency to reduce EMI while maintaining functional requirements. This resolves the contradiction by transforming a static design into a dynamic one that can optimize performance under different operating states.
Solution Approach 2:
The patent changes the parameter of switching speed from a constant value to a variable parameter. By introducing multiple current sources with different current values, the system can change the switching speed parameter according to different operational requirements. This parameter variation allows the system to reduce EMI by avoiding uniform high-frequency switching while still meeting power management demands.
2Productivity
If switching speed is increased to improve power management efficiency, then power conversion efficiency improves, but electromagnetic interference (EMI) increases
Solution Approach 1:
The system dynamically adjusts switching speed based on operational needs rather than maintaining a constantly high switching frequency. The switching control module selects appropriate current sources to achieve optimal switching speeds for different working conditions, ensuring high power conversion efficiency when needed while reducing switching frequency to minimize EMI during other operational states.
Solution Approach 2:
The patent employs periodic variation in switching speed through different current sources. Rather than continuous high-frequency switching, the system uses periodic adjustments in switching frequency, alternating between different current sources to achieve both efficient power conversion and EMI reduction at different time intervals based on operational requirements.
Data Source
AI summary
The present application provides a logic circuit and a display panel. One end of a switching control module of the logic circuit is connected in series with a voltage adjusting control module, and another end of the switching control module is connected in series with a switch component of a voltage adjusting module. Also, the switching control module connected in series with the same switch component has at least two different operational currents for a corresponding switch component to have different switching speeds for alleviating the problem of excessive electromagnetic interference (EMI) occurred in a power management chip of existing LCD products.