Three-Phase Detection Circuit Using Dual Optical Couplers
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Solution Overview
Problem
Conventional three-phase circuit detection solutions are complex, costly, and have poor reliability due to the need for numerous components, making them inefficient in detecting phase loss or reversal in three-phase alternating current systems.
Innovation Solution
A simplified circuit using two optical couplers connected to three-phase wires generates output signals indicating phase states, allowing for detection of phase loss and reversal with a micro control unit to interpret these signals, reducing the number of components and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional three-phase detection circuit is used, then detection function is achieved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent merges the detection of multiple phase states (phase loss, phase reversal) into a unified circuit architecture using only two optical couplers. The optical couplers simultaneously process signals from multiple phase wires through their respective input ends, and the control unit integrates the output signals to determine comprehensive phase states, thereby reducing component count while maintaining detection reliability.
Solution Approach 2:
The optical couplers are designed with multi-functional input ends that can detect different phase states through the same hardware components. The first optical coupler's first input end detects phase loss on the first phase wire, while its second input end detects phase reversal between first and third phase wires. This universal design allows two optical couplers to perform multiple detection functions that would traditionally require more components.
2Reliability
If conventional three-phase detection circuit is used, then detection function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple detection capabilities into a single integrated circuit solution using two optical couplers. By merging the detection of phase loss and phase reversal functions into this compact architecture, the patent reduces the total number of components required, thereby lowering manufacturing costs while maintaining reliable detection performance.
3Device complexity
If simplified circuit is used, then device complexity decreases, but detection precision may be affected
Solution Approach 1:
The patent introduces an intermediary control unit that processes the output signals from the two optical couplers. This control unit acts as a mediator that interprets the optical signals and determines the precise phase state by analyzing the output patterns. The intermediary processing ensures that even with fewer optical couplers, the detection precision for distinguishing between different phase states (phase loss, phase reversal, normal operation) is maintained through intelligent signal analysis.
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 provides a cost-effective and reliable method for detecting phase loss and reversal in three-phase systems, improving the detection process with a simplified circuit structure and enhanced reliability.
Implementation Method 1
a first optical coupler and a second optical coupler, where a first input end and a second input end of the first optical coupler are respectively connected to a first phase wire and a third phase wire of a power supply assembly
Data Source
AI summary
A circuit for three-phase detection, a method for three-phase detection and a compressor are provided. The circuit for three-phase detection includes a first optical coupler and a second optical coupler. A first input end and a second input end of the first optical coupler are respectively connected to a first phase wire and a third phase wire of a power supply assembly, and a first output end of the first optical coupler provides a first output signal. A first input end and a second input end of the second optical coupler are respectively connected to a second phase wire and the third phase wire of the power supply assembly, and a first output end of the second optical coupler provides a second output signal. The first output signal and the second output signal are used to indicate a phase state of a three-phase alternating current of the power supply assembly.