Dynamic Power Factor Correction for Display Devices
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Solution Overview
Problem
Display devices experience reduced power efficiency when power factor correction is applied during low power consumption, as the efficiency gain from corrected power factor is minimal, leading to unnecessary power reduction.
Innovation Solution
A display device and controlling method that dynamically turn on or off the power factor correction unit based on identified power consumption, preventing power factor correction when power is low, and using a resistor and switch to manage inrush current and unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power factor correction is applied continuously, then power factor efficiency is improved, but overall power efficiency deteriorates during low power consumption
Solution Approach 1:
The power factor correction unit is designed to be dynamically controllable, switching between active and inactive states based on real-time power consumption detection. The processor monitors power consumption levels and activates the power factor correction unit only when power consumption exceeds a threshold, making the system adaptive rather than static.
Solution Approach 2:
The system changes the operational parameter (power factor correction activation) based on the detected power consumption parameter. When power consumption is low, the correction unit is deactivated; when power consumption is high, it is activated, thus optimizing energy efficiency across different operating conditions.
2Loss of energy
If power factor correction unit is always on, then received power efficiency increases, but supplied power efficiency decreases
Solution Approach 1:
The power factor correction unit operates periodically rather than continuously. The processor evaluates power consumption at intervals and activates the correction unit only during periods when power consumption is high enough to benefit from correction, reducing unnecessary energy expenditure during low-power periods.
Solution Approach 2:
The system monitors its own power consumption and automatically controls the power factor correction unit without external intervention. The processor detects when correction is beneficial and activates the unit autonomously, making the system self-regulating based on its operational state.
3Loss of energy
If power factor correction is applied during low power consumption, then power factor efficiency improves slightly, but overall system efficiency decreases significantly
Solution Approach 1:
The system applies power factor correction only partially - specifically, only when power consumption exceeds a certain threshold. This partial application of the correction function avoids the excessive energy expenditure that would occur if correction were applied in all cases, including low-power scenarios where it provides minimal benefit.
Data Source
AI summary
An electronic device according to an embodiment the disclosure may include a display, a processor, and a power supply unit supplying power to the display and the processor. The power supply unit may include a power receiving unit receiving AC power from an external power source, a rectifying unit rectifying the AC power to convert the AC power to DC power, and a power factor correction unit adjusting a power factor of the DC power based on voltage at a specified point of the power supply unit and outputting voltage of the DC power to be output to the display, and the processor may be configured to identify power consumption of the display and to turn on or off the power factor correction unit based on the identified power consumption of the display. Moreover, various embodiment grasped through the disclosure are possible.