I2C-Controlled Power Supply Frequency Adjustment for LCD Timing Controller
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Solution Overview
Problem
The connection between the timing controller and gamma chip through an I2C bus in liquid crystal TVs leads to abnormal fluctuations in power supply voltage due to increased current consumption when the timing controller operates, causing display abnormalities.
Innovation Solution
A control method and device that adjusts the operating frequency of the controllable power supply connected to the timing controller, increasing the frequency when the bus address matches the timing controller's address to compensate for fluctuations and maintain stable voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the timing controller operates with internal switches switched on to enable function circuits, then the timing controller can perform read operations through the I2C bus, but the current output from the power supply chip suddenly increases causing abnormal fluctuation in the power supply voltage
Solution Approach 1:
The patent applies preliminary action by detecting the I2C bus activity in advance and proactively increasing the power supply frequency before the timing controller's internal switches are switched on. This prevents the sudden current increase from causing voltage fluctuations, as the power supply is already in a higher frequency state ready to handle the increased load.
Solution Approach 2:
The patent implements dynamics by making the power supply frequency adjustable and dynamic. The frequency is increased from a first frequency to a second frequency based on real-time detection of timing controller operation status through the I2C bus. This dynamic adjustment allows the power supply to adapt to changing current demands and maintain voltage stability.
2Reliability
If the operating frequency of the power supply is increased to compensate for voltage fluctuations, then the voltage stability improves, but the power supply consumes more energy
Solution Approach 1:
The patent applies dynamics by implementing a dynamic frequency adjustment mechanism. The power supply operates at a lower first frequency during normal conditions to save energy, and only increases to a higher second frequency when the timing controller operation is detected through I2C bus activity. This conditional frequency change ensures voltage stability is maintained only when needed, minimizing unnecessary energy consumption.
Data Source
AI summary
The present application refers to a control method and control device of a drive circuit, and a drive circuit. The control method of the drive circuit includes: acquiring a bus address in a bus signal. The bus signal is a signal transmitted over an I2C bus, and the I2C bus is connected to a timing controller. The control method further includes: if the timing controller determining that the bus address matches an address of the timing controller, transmitting a frequency adjustment signal to a controllable power supply with an adjustable operating frequency and connected to the timing controller. The frequency adjustment signal is configured to indicate that an operating frequency of the controllable power supply is adjusted from a first operating frequency to a second operating frequency. The second operating frequency is higher than the first operating frequency.