Adaptive Power Distribution Panel for Selective Solar Load Switching
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Solution Overview
Problem
Current DC-AC converters for solar energy systems face challenges such as high costs, inefficiencies, and radio frequency interference, particularly in producing a true sine wave suitable for all loads and safely interacting with solar arrays, while also requiring complex transformer designs that increase weight and cost.
Innovation Solution
An adaptive electrical power distribution panel with a controller that dynamically disconnects branch circuits or devices from the utility grid based on monitored conditions, using a ternary number system to generate a step-approximation of a sine wave without the need for 60 Hz transformers, reducing weight, cost, and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a true sine wave is produced using linear amplifiers, then the AC power waveform is clean and suitable for all loads, but heat dissipation increases and efficiency decreases
Solution Approach 1:
The patent replaces linear amplifiers with a digital pulse-width modulation (PWM) system using solid-state switches. Instead of using continuous analog amplification that generates heat, the system uses digital switching at high frequency to synthesize a sine wave output. This substitution of mechanical/analog components with digital/electronic components eliminates the heat dissipation problem while maintaining sine wave quality compatible with all loads.
2Loss of energy
If a modified sine wave is used to reduce heat dissipation, then efficiency improves, but radio frequency interference increases and some loads malfunction
Solution Approach 1:
The patent changes the waveform parameters by using high-frequency pulse-width modulation to synthesize a sine wave. Instead of using a simple modified sine wave with few steps, the system varies the duty cycle of PWM signals at high frequency (typically 20-100 kHz) to create a stepped approximation of a sine wave. This parameter change in switching frequency and pulse width allows efficient operation while reducing RF interference through proper filtering and spreading harmonic energy across a broader frequency spectrum.
3Power
If 60 Hz transformers are used in DC-AC converters, then voltage transformation is achieved, but weight and cost increase
Solution Approach 1:
The patent replaces 60 Hz transformers with high-frequency switching circuitry operating at 20-100 kHz. By increasing the switching frequency, the required transformer size is reduced by a factor of 3-5 times while maintaining the same power transformation capability. The high-frequency transformer uses smaller magnetic cores and less copper, dramatically reducing weight and cost while providing the necessary voltage transformation for DC-AC conversion.
4Weight of moving object
If high-frequency switching is used to reduce transformer size, then weight decreases, but radio frequency interference increases
Solution Approach 1:
The patent converts the potentially harmful high-frequency switching noise into a beneficial filtered sine wave output. The high-frequency PWM switching generates harmonic content that, when passed through an LC filter, results in a clean sine wave at the fundamental frequency. The switching frequency is deliberately chosen to be well above the audible and RF interference ranges, and the filter attenuates these high-frequency components while preserving the fundamental sine wave, thus converting the switching noise into a useful filtered output.
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 enables a cost-effective and efficient power distribution system that reduces radio frequency interference, avoids transformer-related inefficiencies, and ensures safe operation with solar arrays, while maintaining a stable AC output across varying DC input voltages.
Implementation Method 1
using a ternary number system to generate a step-approximation of a sine wave
Data Source
AI summary
An adaptive electrical power distribution panel receives electrical power from at least an alternative power source other than a utility electric grid, and selectively outputs power to a plurality of branch circuits, appliances, or devices. An internal or remote controller monitors conditions. In response to the monitored conditions, the controller algorithmically divides the plurality of branch circuits, appliances, or devices into a first group to receive power from the alternative power source and a second group to not receive power from the alternative power source, and breaks electrical connections between the alternative power source and the second group. The monitored conditions may include operating parameters the grid; an instantaneous or average individual current flow; and a charge state of storage batteries. The division into groups may also be in response to stored information, such as a priority of, or history of current usage by, each branch circuit, appliance, or device.