Dual Power Module Overload Circuit for Display Power Continuity
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Solution Overview
Problem
Large-screen display devices with dual power modules have high manufacturing costs due to the large volume of each power module, and there is a need for stable power supply even when some modules fail.
Innovation Solution
A display device with a first and second power module that includes an overload prevention circuit, where the first power module cuts off power when input current exceeds a threshold and adjusts the threshold based on the state of the second power module, and a processor reduces luminance and cuts off power if the second module is abnormal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual power modules are used for redundancy, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a feedback mechanism where the first power module monitors the output current of the second power module through a sensing circuit. When the second power module fails or its output current drops below a threshold, the first power module automatically increases its output to compensate, ensuring continuous power supply without manual intervention or system reconfiguration.
Solution Approach 2:
The first power module autonomously detects the failure state of the second power module and self-adjusts its output current without external control signals. The sensing circuit continuously monitors the second module's output, and when failure is detected, the first module automatically takes over the full load, making the system self-healing and reducing operational complexity.
2Reliability
If each power module is designed to cover the full rating, then reliability is improved, but volume and manufacturing cost increase
Solution Approach 1:
The patent changes the operational parameters of the first power module dynamically. Under normal conditions, it operates at a reduced current level (sharing the load). When the second module fails, the first module's output current parameter is automatically increased to cover the full load requirement. This parameter adjustment allows smaller, more compact power modules while maintaining system reliability.
Solution Approach 2:
The first power module performs partial action during normal operation (supplying only half the total required power), and excessive action during failure conditions (supplying more than its normal share). This partial/excessive action strategy allows the use of smaller power modules that would be insufficient if they had to continuously provide full power, thereby reducing volume and cost.
3Reliability
If the first power module increases output current when second module fails, then reliability is maintained, but the first module may become overloaded
Solution Approach 1:
The patent implements preliminary protective measures by setting a predetermined safe current threshold for the first power module. Before the module can be damaged by overload, the control circuit monitors the output current and automatically limits it to this predetermined safe level. This preliminary action prevents harmful overload conditions while still providing sufficient power to maintain system operation during the second module's failure.
Data Source
AI summary
A display device according to an embodiment includes a display, a first power module that outputs a first power, and a second power module that outputs a second power. The first power and the second power are supplied to the display. The first power module is configured to cut off the first power when an amount of input current exceeds an overload criterion, to identify whether the second power module is abnormal based on the second power, and to change the overload criterion from a first threshold current amount to a second threshold current amount that exceeds the first threshold current amount, in an abnormal state of the second power module.