Dynamic DC Voltage Adjustment in Power Factor Corrector
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Solution Overview
Problem
Existing power circuit apparatuses for display devices convert input AC voltage to a single high DC voltage, leading to reduced AC-DC conversion efficiency and increased manufacturing costs due to high voltage stress on components, particularly when input AC voltage is low.
Innovation Solution
A power circuit part with a rectifier and power factor corrector that dynamically adjusts the output DC voltage based on the input AC voltage level, using multiple target DC voltage levels and hysteresis ranges to optimize power factor correction and reduce voltage stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power circuit apparatus converts input AC voltage to a single high DC voltage level (approximately 395V) regardless of input voltage level, then the output DC voltage is maintained at a consistent high level, but the AC-DC conversion efficiency deteriorates when input AC voltage is low (close to 65V)
Solution Approach 1:
The power factor corrector dynamically adjusts the output DC voltage level based on the detected input AC voltage level. The PFC controller selects from multiple target DC voltage levels (first, second, third levels) corresponding to different AC voltage level ranges, enabling the system to adapt its operating parameters in real-time to maintain optimal conversion efficiency across varying input conditions
Solution Approach 2:
The system changes the output DC voltage parameter according to the input AC voltage level. When AC voltage is detected to be in a low voltage range, the PFC controller selects a lower target DC voltage level, thereby optimizing the conversion process and reducing energy loss while still providing sufficient operating power to the display apparatus
2Reliability
If the power circuit apparatus converts input AC voltage to a single high DC voltage level (approximately 395V) regardless of input voltage level, then the output DC voltage is maintained at a consistent high level, but the parts (inductor, FET, diode) require high specifications to operate at high voltage and high current, increasing manufacturing costs and device size
Solution Approach 1:
The power factor corrector dynamically adjusts the output DC voltage level based on the detected input AC voltage level. The PFC controller selects from multiple target DC voltage levels (first, second, third levels) corresponding to different AC voltage level ranges, enabling the system to adapt its operating parameters in real-time to maintain optimal conversion efficiency across varying input conditions
Solution Approach 2:
The system changes the output DC voltage parameter according to the input AC voltage level. When AC voltage is detected to be in a low voltage range, the PFC controller selects a lower target DC voltage level, thereby optimizing the conversion process and reducing energy loss while still providing sufficient operating power to the display apparatus
3Adaptability or versatility
If the power factor corrector operates even when high AC voltage (approximately 260V) is input, then the power circuit can handle high voltage conditions, but the voltage stress on parts (snubber, FET, diode) increases, requiring high specification parts and increasing manufacturing costs
Solution Approach 1:
The power factor corrector dynamically adjusts the output DC voltage level based on the detected input AC voltage level. The PFC controller selects from multiple target DC voltage levels (first, second, third levels) corresponding to different AC voltage level ranges, enabling the system to adapt its operating parameters in real-time to maintain optimal conversion efficiency across varying input conditions
Solution Approach 2:
The system changes the output DC voltage parameter according to the input AC voltage level. When AC voltage is detected to be in a low voltage range, the PFC controller selects a lower target DC voltage level, thereby optimizing the conversion process and reducing energy loss while still providing sufficient operating power to the display apparatus
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
Improves AC-DC conversion efficiency, reduces component stress, and lowers manufacturing costs by allowing the power circuit part to operate with lower-specification components and preventing unnecessary operation during abnormal voltage conditions.
Implementation Method 1
a rectifier configured to rectify a current of an alternating current (AC) power input that is provided as input power into a direct current (DC)
Implementation Method 2
a power factor corrector configured to output a DC voltage output set at a DC voltage level corresponding to an AC voltage level of the AC power input... converts the input AC voltage into the single high DC voltage of approximately 395V
Data Source
AI summary
A power circuit part, a power control method and a display apparatus having the same control an output DC voltage supplied as operating power to elements such as a display to be variably output at different levels according to a voltage level of input AC power. The power circuit part includes a rectifier configured to rectify a current of an input alternating current (AC) power into a direct current (DC); and a power factor corrector configured to output a DC voltage output set at a DC voltage level corresponding to an AC voltage level of the input AC power, and supplies the DC voltage as operating power to the electronic apparatus, wherein the DC voltage level is selected from a plurality of target DC voltage levels each corresponding to at least one of a plurality of AC voltage level ranges.