Display Power Supply Control for DC Link Capacitor Burnout
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Solution Overview
Problem
As the resolution of image displays increases, power consumption also rises, leading to an increased risk of burnout of capacitors in the power supply, particularly due to errors in detecting the dc link voltage.
Innovation Solution
An image display apparatus with a power supply system that includes an AC/DC converter, a dc link capacitor, input and dc link voltage detectors, and a controller to manage the switching devices based on detected voltage levels, turning them off or adjusting the dc link voltage to prevent capacitor burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display is increased, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The patent changes the operating parameters of the AC/DC converter by dynamically adjusting the switching device operation based on detected dc link voltage levels. When voltage exceeds a threshold, the controller modifies switching parameters to reduce power input, thereby managing power consumption while maintaining display resolution requirements
2Power
If the power consumption increases, then the display performance is improved, but the reliability of the capacitor decreases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the dc link voltage and adjusts the AC/DC converter operation accordingly. When the detected voltage exceeds a predetermined threshold, the controller modifies the switching device operation to reduce power input, preventing excessive voltage buildup that would otherwise increase capacitor stress and reduce reliability
Solution Approach 2:
The system takes preliminary protective action by detecting voltage thresholds before capacitor damage occurs. The controller is configured to adjust switching device operation when voltage reaches a critical level, preventing the continuous voltage increase that would lead to capacitor burnout, thus protecting the capacitor before failure can occur
3Measurement precision
If the dc link voltage detection is performed, then the voltage monitoring is improved, but the detection errors may cause continuous voltage increase
Solution Approach 1:
The patent applies preliminary action by setting a predetermined voltage threshold that triggers protective measures before actual capacitor stress occurs. The controller monitors for this threshold condition and preemptively adjusts switching device operation to prevent the detection error from causing continuous voltage increase and potential capacitor failure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents burnout of dc link capacitors by controlling the AC/DC converter based on input and dc link voltage levels, maintaining stable dc link voltage, and preventing continuous increases due to detection errors.
Implementation Method 1
an AC/DC converter comprising at least one switching device and configured to convert an input AC voltage into a DC voltage
Implementation Method 2
a dc link capacitor disposed at the dc link
Data Source
AI summary
An image display apparatus is disclosed. The image display apparatus according to an embodiment of the present disclosure includes: a display; and a power supply to supply a driving voltage to the display, wherein the power supply includes: an AC/DC converter comprising at least one switching device and configured to convert an input AC voltage into a DC voltage and output the DC voltage to a dc link; a dc link capacitor disposed at the dc link; an input voltage detector to detect the input AC voltage; a dc link voltage detector to detect a dc link voltage; and a controller to control the AC/DC converter, wherein in response to the detected input AC voltage exceeding a first reference value and the detected dc link voltage being lower than or equal to a second reference value lower than the first reference value, the controller is configured to turn off the switching device in the AC/DC converter. Accordingly, burnout of the dc link capacitor may be prevented.