Input Power Monitoring Circuit Using Frequency-Based Voltage Detection
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Solution Overview
Problem
Existing input power monitoring circuits face challenges in accurately determining changes in input power voltage due to voltage distortion, leading to difficulties in monitoring alternating current power effectively.
Innovation Solution
An input power monitoring circuit is designed with a rectifier circuit, divided voltage generator circuit, divided voltage comparator circuit, switching circuit, and computing device. The circuit compares rectified divided voltages using comparators to generate a pulse signal based on voltage states, with the computing device determining the voltage state by measuring the frequency of the pulse signal, thereby improving voltage monitoring accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage monitoring is performed using pulse width comparison method, then voltage monitoring function is achieved, but measurement precision deteriorates due to voltage distortion
Solution Approach 1:
The patent divides the voltage monitoring function into multiple comparator circuits, each comparing rectified voltage against different threshold voltages. This segmentation allows the system to detect voltage states more accurately by combining multiple comparison results, thereby improving measurement precision while maintaining reliability under voltage distortion conditions.
Solution Approach 2:
The patent changes the monitoring parameter from pulse width to pulse frequency. By measuring the frequency of pulses generated from multiple comparator outputs rather than comparing pulse widths directly, the system achieves more accurate voltage monitoring that is less susceptible to voltage distortion effects.
2Measurement precision
If single comparator method is used, then device complexity is reduced, but measurement precision deteriorates due to inability to detect voltage state changes accurately
Solution Approach 1:
The patent segments the voltage detection function across multiple comparators with different threshold voltages. Each comparator detects a specific voltage state, and their combined outputs provide comprehensive voltage monitoring. This segmentation improves detection accuracy while keeping each individual comparator simple.
Solution Approach 2:
The patent merges the outputs of multiple comparators into a single pulse signal through logical combination. This merging allows the system to achieve precise voltage state detection by combining information from multiple comparators while presenting a unified output to the control device.
3Reliability
If pulse width comparison is used, then voltage monitoring is achieved, but reliability deteriorates due to incorrect power failure detection
Solution Approach 1:
The patent implements feedback by continuously monitoring voltage states through multiple comparators and adjusting the pulse signal generation accordingly. This feedback mechanism ensures that power failure detection is based on accurate, real-time voltage state information from multiple sources, improving reliability while preventing information loss.
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 excellent determination of input power voltage changes, preventing incorrect power failure detection and reducing errors caused by voltage distortion, while allowing for precise monitoring of both voltage drops and rises.
Implementation Method 1
a rectifier circuit configured to rectify periodic input power and generate a rectified voltage
Implementation Method 2
a divided voltage generator circuit configured to divide the rectified voltage and generate a first rectified divided voltage and a second rectified divided voltage
Implementation Method 3
a first comparator configured to compare the first rectified divided voltage with a first comparison voltage
Implementation Method 4
a second comparator configured to compare the second rectified divided voltage with a second comparison voltage
Data Source
AI summary
An input power monitoring circuit includes a rectifier circuit, a divided voltage generator circuit, a divided voltage comparator circuit, a switching circuit, and a computing device. The divided voltage comparator circuit is configured in such a manner that polarity of an output signal that is outputted from a first comparator upon a first rectified divided voltage exceeding a first comparison voltage is opposite to polarity of an output signal that is outputted from a second comparator upon a second rectified divided voltage exceeding a second comparison voltage. Output terminals of the first and second comparators are connected to each other. A connection point between the output terminals of the first and second comparators is connected to an input terminal of the switching circuit. The computing device measures frequency of a pulse signal outputted from the switching circuit, and determines the voltage state of input power based on the measured frequency.