AC Power Constant Loading via Randomized Phase Slicing
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Solution Overview
Problem
Existing energy savings devices in AC power applications cause unbalanced loading and increased harmonic content due to phase-chopping, leading to inefficient energy utilization and compromised performance of electrical devices.
Innovation Solution
A system and method that determines specific turn-on and turn-off points for each half cycle of a modulating sine wave, allowing for the removal of a slice under the curve while maintaining a constant RMS value, ensuring even loading and reducing harmonic content through time division multiplexing and randomized control across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If phase-chopping is used to reduce energy consumption, then energy savings are achieved, but unbalanced loading and increased harmonic content occur
Solution Approach 1:
The patent applies periodic action by using randomization within each half-cycle of the AC waveform. Instead of continuous phase-chopping, the system introduces periodic variations in pulse width and position that are randomized each half-cycle, maintaining energy reduction while preventing harmonic buildup through the periodic yet unpredictable nature of the modulation.
Solution Approach 2:
The system dynamically adjusts the pulse width and position parameters in real-time based on randomized values for each half-cycle. This dynamic modification of PWM parameters allows the system to adapt the energy reduction strategy continuously, preventing the repetitive unbalanced loading that occurs with fixed phase-chopping patterns.
2Loss of energy
If repetitive unbalanced loading is applied to reduce overall energy load, then energy consumption decreases, but device performance is compromised
Solution Approach 1:
The patent intentionally introduces asymmetry through randomization of pulse parameters within each half-cycle. By making each half-cycle unique through randomized pulse width and position variations, the system breaks the repetitive symmetry of traditional phase-chopping, thereby maintaining energy reduction while preventing the performance degradation caused by repetitive unbalanced loading patterns.
Solution Approach 2:
The system employs dynamic parameter adjustment where pulse width and position are continuously modified based on randomized values. This dynamic approach ensures that energy reduction is achieved through varied patterns rather than repetitive identical patterns, thereby maintaining both energy efficiency and device performance reliability.
3Loss of energy
If AC power timing or frequency deviates from constant loading, then energy can be reduced, but electrical device performance is affected
Solution Approach 1:
The system uses periodic action by applying randomized pulse modifications at regular intervals corresponding to AC half-cycles. This periodic yet randomized approach allows energy reduction through controlled deviations from constant loading, while the systematic periodic structure ensures that electrical devices still receive power in a predictable enough manner to maintain performance.
Solution Approach 2:
The patent implements dynamic control where pulse parameters are adjusted in real-time based on randomized values within each half-cycle. This dynamic adjustment allows the system to reduce energy consumption through variable loading patterns while maintaining compatibility with electrical devices that expect relatively stable power delivery, as the changes occur within acceptable operational ranges.
Data Source
AI summary
A system and method are provided for constant loading in AC power applications where at least one turn-on point of at least one half cycle of a modulating sine wave is randomly selected; at least one turn-off point is determined; and at least one slice located between the at least one turn-on point and turn-off point is removed. The slices may be removed by utilizing insulated gate bipolar transistors or field effect transistors.