Power Supply Control with Hysteresis for Peak Load Limiting
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Solution Overview
Problem
Existing electricity supply systems struggle to manage high consumption periods, such as electric vehicle charging, without exceeding maximum usage power limits, leading to potential electricity cutoffs.
Innovation Solution
A dual-circuit electricity control system with a shut-off switch, controlled by processors, manages consumption by intermittently powering high-demand appliances like electric vehicles, using hysteresis thresholds to avoid exceeding maximum power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If electricity supply is continuously provided to high-demand appliances, then appliance operation is maintained, but maximum power consumption limits are exceeded
Solution Approach 1:
The patent implements periodic action by controlling the shut-off switch to intermittently connect the second group of appliances to the power supply. The control device periodically measures consumption, compares it against thresholds, and switches the power connection on and off accordingly, transforming continuous operation into controlled periodic operation that respects power limits.
Solution Approach 2:
The system dynamically adjusts the power supply state based on real-time consumption measurements. The shut-off switch transitions between connected and disconnected states depending on whether consumption exceeds the first or falls below the second threshold, creating a dynamic response to changing load conditions rather than a static on/off state.
2Power
If electricity supply is interrupted to control power consumption, then maximum power limits are complied with, but appliance operation is disrupted
Solution Approach 1:
The control device continuously measures electricity consumption and uses this feedback to determine whether to connect or disconnect the shut-off switch. When consumption exceeds the first threshold, the switch disconnects; when consumption falls below the second threshold, the switch reconnects. This closed-loop feedback system ensures power compliance while minimizing disruptions.
Solution Approach 2:
The patent employs hysteresis with two distinct thresholds (first threshold for disconnection, second threshold for reconnection) where the second threshold is lower than the first. This creates a buffer zone that prevents rapid switching and provides cushioning against measurement noise or temporary fluctuations, ensuring more stable and predictable appliance operation.
3Productivity
If consumption thresholds are set close to maximum limits, then power utilization is optimized, but measurement noise causes frequent switching
Solution Approach 1:
The patent addresses measurement noise and frequent switching by implementing a hysteresis buffer between the first and second thresholds. The first threshold (for disconnection) is set below the maximum consumption limit, and the second threshold (for reconnection) is set lower still. This creates a protective margin that absorbs measurement variations and prevents the shut-off switch from rapidly toggling near the maximum limit.
4Device complexity
If a single electrical outlet is used for multiple appliances, then electrical infrastructure is simplified, but power allocation between appliances becomes problematic
Solution Approach 1:
The patent segments the electrical load into two distinct groups: a first group of appliances that can operate continuously, and a second group of high-demand appliances that are controlled by the shut-off switch. This segmentation allows the system to manage power allocation flexibly within a single outlet infrastructure, ensuring that when the second group operates, the first group's consumption is limited to maintain compliance with maximum power limits.
Data Source
AI summary
The present invention especially discloses a method and a device for implementing such a method of controlling the electricity supply to a second group of appliances including at least one appliance, the method being implemented by a device comprising a first processor designed to carry out electricity consumption measurements, a second processor, and a shut-off switch controlled by the second processor to trigger or stop the power supply to the second group, the method includes obtaining the total electricity consumption of a first group of appliances and the second group of appliances over a period of time, hysteresis operation, including shutting off the power supply if total consumption exceeds the first threshold, and power supply recovery if total consumption falls below the second threshold, and repeating the previous steps over successive periods of time.