Power Management Circuit for Stable Pixel Voltage
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Solution Overview
Problem
Display devices face challenges in generating a pixel power supply voltage with a desired voltage level due to fluctuations in input voltage, particularly when the input voltage is higher than the desired level, leading to ineffective boosting operations and inconsistent pixel power supply.
Innovation Solution
A power management circuit that includes a boost converter, a voltage regulator, a bypass transistor, and a regulator control block, which compares the input voltage with a reference voltage to adjust the boosting operation, enabling the voltage regulator only when necessary and maintaining its state for a minimum enable time to ensure a stable pixel power supply voltage across a wide range of input voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a boost converter is used to generate pixel power supply voltage from input voltage, then the pixel power supply voltage can be generated when input voltage is low, but the boosting operation fails when input voltage is higher than the desired voltage level
Solution Approach 1:
A voltage regulator is introduced as an intermediary component between the boost converter and the pixel power supply. The voltage regulator receives both the input voltage and boosted voltage, regulates them appropriately, and outputs a stable pixel power supply voltage. This intermediary structure allows the system to handle both low input voltages (using boost conversion) and high input voltages (using voltage regulation) reliably.
Solution Approach 2:
The system dynamically switches between boost conversion mode and voltage regulation mode based on the input voltage level. When input voltage is below a threshold, the boost converter is activated; when input voltage exceeds the threshold, the voltage regulator takes over. This dynamic operation ensures reliable pixel power supply across a wide input voltage range.
2Reliability
If the voltage regulator is continuously enabled to regulate the boosted voltage, then the pixel power supply voltage remains stable, but power consumption increases
Solution Approach 1:
The voltage regulator is enabled periodically or conditionally based on the input voltage level rather than continuously. When the input voltage is within the desired range or when the boosted voltage is sufficient, the voltage regulator is disabled or put into low-power mode. This periodic/conditional operation reduces power consumption while maintaining voltage stability when needed.
Solution Approach 2:
The operating state of the voltage regulator is changed based on input voltage parameters. The system monitors input voltage levels and adjusts the voltage regulator's enable/disable state accordingly. This parameter-based control optimizes the balance between voltage stability and power consumption.
3Device complexity
If the boosting operation is performed with a fixed reference boosting voltage, then the circuit design is simple, but the pixel power supply voltage fluctuates when input voltage fluctuates
Solution Approach 1:
A feedback mechanism is implemented where the output pixel power supply voltage is monitored and compared with a reference voltage. The error signal generated from this comparison is fed back to adjust the boost converter's operation, ensuring that the output voltage remains stable even when input voltage fluctuates. This closed-loop control improves voltage stability without significantly increasing circuit complexity.
Solution Approach 2:
The reference boosting voltage is adjusted dynamically based on input voltage conditions and feedback from the output voltage. Instead of using a fixed reference voltage, the system adapts the reference level to maintain optimal boosting performance across varying input conditions, thereby stabilizing the pixel power supply voltage.
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 solution effectively generates a pixel power supply voltage with a desired level even when the input voltage fluctuates, preventing ripple and excessive power consumption by dynamically adjusting the boosting operation based on input voltage levels.
Implementation Method 1
a boost converter which generates a boosted voltage at a boosting node by boosting an input voltage
Implementation Method 2
a bypass transistor coupled between the boosting node and the output node
Data Source
AI summary
A power management circuit includes a boost converter which generates a boosted voltage at a boosting node by boosting an input voltage by using a reference boosting voltage, a voltage regulator coupled to the boosting node and an output node, a bypass transistor coupled between the boosting node and the output node, and a regulator control block which compares the input voltage with a reference input voltage. When the input voltage is higher than or equal to the reference input voltage, the regulator control block increases the reference boosting voltage to increase the boosted voltage, enables the voltage regulator to generate a regulated voltage by regulating the increased boosted voltage, turns off the bypass transistor such that the regulated voltage is output as a pixel power supply voltage at the output node, and maintains an enable state of the voltage regulator for a minimum enable time.