Power Supply Compensation Circuit for Liquid Crystal Display Voltage Ripple Reduction
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Solution Overview
Problem
Existing power supply devices for liquid crystal displays face challenges in efficiently regulating output voltage and response speed, leading to voltage ripples and potential display malfunctions due to inadequate feedback and compensation mechanisms.
Innovation Solution
A power supply device incorporating a power circuit, feedback circuit, compensation circuit, and PWM controller that adjusts the duty ratio of the PWM signal based on feedback voltage comparisons, utilizing a comparator, voltage adjusters, and a booster to enhance response speed and minimize voltage ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional power supply device uses basic feedback mechanism, then the structure is simple, but the response speed is slow and voltage ripples occur
Solution Approach 1:
The compensation circuit is divided into multiple functional blocks: a first voltage adjuster that adjusts voltage based on feedback comparison, a second voltage adjuster that provides alternative voltage adjustment paths, and a booster that enhances response speed in predetermined sections. This segmentation allows each component to perform specific functions optimally while managing overall system complexity.
Solution Approach 2:
The patent implements dynamic response speed enhancement through the booster circuit that activates in predetermined sections based on control signals. The switching circuit dynamically connects or disconnects the second voltage adjuster based on operating conditions, allowing the system to adapt its compensation characteristics in real-time to minimize voltage ripples and improve response speed when needed.
2Reliability
If the power supply device uses inadequate feedback mechanism, then the device complexity is low, but voltage ripples occur and display malfunctions may happen
Solution Approach 1:
The patent implements a comprehensive feedback mechanism where the feedback circuit continuously monitors the output voltage and feeds it back to the compensation circuit. The comparator compares the feedback voltage with a reference voltage, and the compensation circuit generates compensation signals based on this comparison. This closed-loop feedback system dynamically adjusts the PWM duty ratio to maintain stable output voltage and prevent display malfunctions.
Solution Approach 2:
The booster circuit is designed to provide preliminary compensation action in predetermined sections before voltage ripples can cause display malfunctions. By anticipating and compensating for voltage variations in advance, the system prevents instability rather than reacting after problems occur, thereby improving reliability.
3Manufacturing precision
If the power supply device uses basic PWM control, then the control mechanism is simple, but the output voltage regulation is insufficient
Solution Approach 1:
The patent dynamically changes the PWM duty ratio parameter based on real-time feedback voltage comparisons and compensation signals. The PWM controller adjusts the duty ratio in response to voltage deviations detected by the comparator and compensation generated by the compensation circuit, enabling precise output voltage regulation that adapts to varying operating conditions.
Solution Approach 2:
The feedback mechanism provides continuous information about output voltage status to the PWM controller, which then adjusts the duty ratio accordingly. This closed-loop control ensures precise voltage regulation by constantly monitoring and correcting deviations from the target voltage level.
Data Source
AI summary
A power supply device includes a power circuit, feedback circuit, compensation circuit, and PWM controller. The power circuit generates an output voltage based on a PWM signal. The feedback circuit outputs a feedback voltage. The compensation circuit compares a reference voltage with the feedback voltage and outputs a compensation signal based on a comparison result. The PWM controller adjusts the duty ratio of the PWM signal based on the compensation signal. The compensation circuit includes a comparator to compare the feedback voltage with the reference voltage, a first voltage adjuster to adjust a voltage level of a compensation voltage based on the comparison result, and a compensator output the compensation signal based on the voltage level of the compensation voltage. The compensation signal has a width in a high section that varies. The booster boosts the response speed of the compensator in a predetermined section based on a control signal.