Power Distribution Box AC Fault Detection for Fast Source Switching
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Solution Overview
Problem
The switching speed between an energy storage power supply and a utility power supply in power distribution boxes is insufficient due to the time required for standard relays or circuit breakers to detect power failures, exceeding the design requirement of 20 milliseconds.
Innovation Solution
A detection method that involves obtaining real-time and simulated alternating-current voltages and phases to determine voltage differences within a utility power cycle, using isolated operational amplifiers and metering circuits to reduce interference from X capacitors, allowing for rapid power supply switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard relay or circuit breaker switching action is used, then power supply switching can be achieved, but switching speed exceeds the predetermined value (20 milliseconds) and fails to satisfy design requirements
Solution Approach 1:
The patent performs preliminary detection of the utility power supply status before switching is needed. By continuously monitoring the input alternating current voltage and comparing it with a simulated voltage generated from the zero-point alternating current phase, the system detects power failures in advance, allowing the switching mechanism to be triggered immediately when a failure occurs, thus achieving switching within the predetermined time without being limited by relay or circuit breaker action time
Solution Approach 2:
The patent replaces the mechanical relay or circuit breaker switching mechanism with an electronic control system. The control device uses electronic voltage detection and comparison circuits to detect power failures and generates control signals for switching, eliminating the mechanical action time limitation of traditional relays or circuit breakers and enabling switching speed to meet the predetermined time requirement
2Measurement precision
If detection time is extended to ensure accurate power failure determination, then measurement accuracy improves, but switching speed decreases and fails to meet design requirements
Solution Approach 1:
The system continuously monitors and detects the utility power supply status in advance by comparing real-time input voltage with simulated voltage derived from zero-point phase information. This preliminary detection ensures accurate power failure identification before switching is required, eliminating the need for extended detection time during actual switching events while maintaining high measurement precision
Solution Approach 2:
The patent employs a feedback mechanism where the detected input alternating current voltage is continuously compared with the simulated voltage generated from the zero-point alternating current phase. This real-time feedback comparison provides accurate power failure detection information to the control device, enabling both high measurement precision and rapid switching response without requiring extended detection periods
Data Source
AI summary
Provided are a detection method, a control device, a power distribution box, and a storage medium. The detection method applied in a power distribution box includes: obtaining a real-time input alternating-current voltage and a zero-point alternating-current phase of the power distribution box within a utility power cycle; obtaining a simulated input alternating-current voltage of the power distribution box within the utility power cycle based on the zero-point alternating-current phase; determining that the real-time input alternating-current voltage is normal in response to an alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being smaller than or equal to a predetermined threshold, or determining that the real-time input alternating-current voltage is abnormal in response to the alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being greater than the predetermined threshold.