DC Voltage Conversion Circuit with Protection for LCD Safety
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Solution Overview
Problem
Conventional direct-current voltage conversion circuits in liquid crystal display devices lack abnormality detection, leading to excessive current and potential burning of electric elements when abnormalities such as short circuits occur.
Innovation Solution
A direct-current voltage conversion circuit incorporating a control chip, conversion circuit, and protection circuit, where the protection circuit detects abnormalities through feedback voltage comparison and controls the control chip to shut off the conversion circuit when anomalies are detected, preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage conversion circuit operates without abnormality detection, then the device complexity is reduced, but the reliability deteriorates due to potential element damage from excessive current
Solution Approach 1:
The protection circuit performs preliminary detection of abnormal conditions (such as short circuits) before they can cause damage to the voltage conversion circuit elements. By detecting feedback voltage abnormalities in advance and triggering protective action, the system prevents harmful effects before they occur, resolving the contradiction between added complexity and improved reliability.
2Reliability
If the protection circuit continuously monitors the conversion circuit, then the reliability is improved, but the loss of energy increases due to continuous operation of detection components
Solution Approach 1:
The protection circuit utilizes the existing feedback voltage signal from the voltage conversion circuit for abnormality detection. By comparing the feedback voltage against reference voltages through operational amplifiers, the system achieves continuous monitoring without requiring separate sensing components, thereby improving reliability while minimizing additional energy consumption.
3Reliability
If the protection circuit quickly shuts off the conversion circuit upon detecting abnormality, then the reliability is improved, but the loss of time occurs due to interruption of voltage conversion function
Solution Approach 1:
The protection circuit is designed to detect abnormal conditions and trigger protective shutdown action immediately upon detection. By having the determination circuit continuously compare feedback voltage with reference voltages and the control circuit ready to execute shutdown, the system performs preliminary protective action that prevents prolonged operation under abnormal conditions, accepting brief interruption time as necessary to prevent element damage.
Data Source
AI summary
A direct-current voltage conversion circuit and a liquid crystal display device are disclosed. The direct-current voltage conversion circuit includes a control chip, a conversion circuit and a protection circuit, wherein, the control chip is electrically connected to the conversion circuit, the control chip generates a control signal and an original voltage signal; the conversion circuit receives the control signal and the original voltage signal, and under a controlling of the control signal, obtaining a direct-current voltage signal according to the original voltage signal; the protection circuit detects if the conversion circuit generates an abnormality according to the direct-current voltage signal, and turning off the conversion circuit when the conversion circuit generates the abnormality.