Display Device Power Sequencing for Dual AC Cable Rush Current Control
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Solution Overview
Problem
Display devices requiring multiple AC power cables face issues with rush currents due to the unpredictable order of cable connections, leading to potential power supply failures.
Innovation Solution
A display device design that includes multiple timing controllers and power supply devices, with a processor that applies driving signals only when both AC power cables are connected, using an AND gate circuit to detect cable connectivity and prevent rush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple AC power cables are used to meet high power consumption requirements, then the power supply capacity is improved, but the risk of power supply failure due to rush current increases
Solution Approach 1:
The system performs preliminary detection of AC power cable connections through voltage detection circuits before enabling the power supply. The processor checks detection signals indicating whether both AC power cables are properly connected, and only then activates the power supply devices. This preliminary action prevents rush current by ensuring all power cables are connected before power is applied to the timing controllers.
2Speed
If driving signals are applied immediately when AC power cables are connected, then the system responsiveness is improved, but rush current damage to power supply devices occurs
Solution Approach 1:
The system implements a feedback mechanism where voltage detection circuits continuously monitor the connection status of AC power cables and send detection signals to the processor. The processor uses this feedback information to determine whether to apply driving signals to the timing controllers. This feedback loop ensures that driving signals are only applied when both AC power cables are confirmed connected, preventing rush current while maintaining system responsiveness.
3Reliability
If voltage detection circuits are implemented to detect AC power cable connections, then the power supply safety is improved, but the device complexity increases
Solution Approach 1:
The system introduces voltage detection circuits as intermediary components between the AC power cables and the main power supply system. These detection circuits monitor the connection status and provide detection signals to the processor without directly participating in the power transmission path. This intermediary approach enhances power supply safety by enabling connection verification while maintaining relatively simple circuit implementation.
Data Source
AI summary
A display device includes: a first timing controller; a first power supply device configured to provide, based on a first alternating current (AC) power being transferred through a first AC power cable, a first direct current (DC) voltage to the first timing controller based on the first AC power; a second timing controller; a second power supply device configured to provide, based on a second AC power being transferred though a second AC power cable, a second DC voltage to the second timing controller based on the second AC power; and a main board including at least one processor configured to: based on the first AC power cable being detected as connected to the first AC power, and based on the second AC power cable being detected as connected to the second AC power, apply driving signals to the first and the second timing controllers.