Power Supply Voltage Control via Capacitor Segmentation
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Solution Overview
Problem
Existing power supply systems for display devices, such as LCD, LED, and OLED, face challenges in rapidly changing driving voltages, especially at no-load conditions, which can lead to increased power consumption and deteriorated picture quality due to high output capacitance values.
Innovation Solution
A power supply system comprising an inputter with an input capacitor, a converter with an output capacitor, and a controller that adjusts the voltage levels by using a PWM signal generator to control switches and an inductor, allowing for rapid voltage changes based on a reference voltage, thereby minimizing the impact on power consumption and picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output capacitance of the drive circuit is increased to handle large current amounts, then the current handling capability is improved, but the voltage lowering time is significantly increased
Solution Approach 1:
The patent divides the output capacitance into two separate capacitances: a first capacitance connected to the output terminal and a second capacitance connected to the common terminal. This segmentation allows independent control of voltage discharge paths, enabling rapid voltage lowering by directing discharge current through the second capacitance while maintaining output voltage stability through the first capacitance.
Solution Approach 2:
The patent introduces a regulator circuit as an intermediary component between the capacitors and the load. This regulator controls the discharge of the second capacitance to rapidly lower the driving voltage when needed, while maintaining normal operation through standard PWM control of the converter.
2Speed
If the voltage change time is reduced to meet panel requirements, then the picture quality is improved, but the power consumption increases
Solution Approach 1:
By segmenting the output capacitance into first and second capacitances with separate control paths, the system can rapidly discharge voltage through the second capacitance when voltage change is needed, while the first capacitance maintains stable output voltage. This reduces the energy required for voltage changes compared to discharging a single large capacitance.
Solution Approach 2:
The patent changes the operational parameters of the capacitors dynamically: during normal operation, both capacitances work together to maintain stable output; during voltage lowering, the second capacitance is discharged rapidly while the first capacitance maintains output voltage, achieving fast voltage change with reduced power consumption.
3Use of energy by moving object
If the driving voltage is lowered rapidly at no-load condition, then the power consumption is reduced, but the voltage change time requirement may not be met with traditional circuits
Solution Approach 1:
The regulator circuit acts as an intermediary that controls the discharge of the second capacitance. By activating the regulator to discharge the second capacitance rapidly, the system achieves fast voltage lowering at no-load conditions, reducing power consumption while meeting voltage change time requirements.
Solution Approach 2:
The system dynamically switches between different operational modes: during normal load, both capacitances maintain stable output voltage; at no-load condition, the second capacitance is rapidly discharged through the regulator while the first capacitance maintains output voltage, enabling adaptive power consumption management based on load conditions.
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
The system enables rapid voltage changes at no-load conditions, reducing power consumption and maintaining picture quality by efficiently managing voltage levels through the controller's use of PWM signals and capacitors, thus addressing the limitations of existing systems.
Implementation Method 1
a pulse width modulation (PWM) signal generator configured to generate a PWM signal for alternately controlling the first switch and the second switch
Implementation Method 2
an inductor having one end connected to the other end of the first switch and the one end of the second switch
Implementation Method 3
an inputter including an input capacitor and configured to receive an input of a DC voltage; a converter including an output capacitor
Data Source
AI summary
A power supply includes an inputter including an input capacitor and configured to receive an input DC voltage, a converter including an output capacitor and configured to convert the input DC voltage and to output the converted DC voltage, and a controller configured to control the converter to output a voltage corresponding to a reference voltage.