Inverter Overvoltage Protection via Comparator Detection
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Solution Overview
Problem
Inverting apparatuses in AC power systems face energy waste due to ineffective power output compensation, leading to increased AC output voltage and potential crashes, as they cannot instantly detect abnormal AC output voltage without complex sampling circuits, which also increase overall circuit design costs.
Innovation Solution
An inverting apparatus with a detection circuit that compares AC output voltage to reference voltages using a simple circuit configuration, generating indication signals to determine overvoltage or undervoltage, allowing the control circuit to enable protection mechanisms without complex operations, thereby reducing energy waste and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex sampling circuit is used to detect AC output voltage, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the voltage detection function from the microprocessor and implements it independently through a dedicated detection circuit with comparators. This separate detection circuit continuously monitors the AC output voltage and directly generates protection signals, eliminating the need for complex microprocessor operations and achieving both high detection precision and circuit simplicity.
Solution Approach 2:
The patent introduces comparator circuits as intermediary components between the voltage sampling circuit and the microprocessor. These comparators pre-process the voltage signals by comparing them against reference voltages and generating standardized indication signals, which simplifies the overall detection system while maintaining high precision through the comparators' rapid response characteristics.
2Measurement precision
If microprocessor operations are used to determine voltage abnormality, then detection accuracy is improved, but response speed deteriorates
Solution Approach 1:
The patent implements preliminary action by having the detection circuit continuously monitor and pre-process voltage signals before any abnormality occurs. The comparators are always ready with reference voltages pre-set, and immediately generate protection signals upon detecting voltage deviations, eliminating the need for complex microprocessor calculations and achieving both high accuracy and fast response.
Solution Approach 2:
The patent replaces the mechanical/computational processing of voltage analysis with electronic comparison operations. Instead of using microprocessor-based algorithms to analyze voltage waveforms, the system uses comparator circuits that electronically compare instantaneous voltage values against reference levels, providing rapid response speeds while maintaining detection accuracy through the comparators' precise threshold comparison capability.
3Ease of manufacture
If general sampling circuit designs are used, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The patent segments the voltage detection system into functionally independent modules: a voltage sampling circuit, comparator circuits, reference voltage generation, and protection control. Each module performs a specific function and can be designed and manufactured independently, simplifying the overall implementation while reducing total circuit complexity through clear functional separation and standardized interfaces.
Data Source
AI summary
An inverting apparatus and an AC power system are provided. The inverting apparatus includes an inverting circuit, a detection circuit, and a control circuit. The inverting circuit receives a DC input voltage and converts the DC input voltage into an AC output voltage. The detection circuit samples the AC output voltage and compares the sampled AC output voltage respectively with a first reference voltage and a second reference voltage so as to generate a first indication signal and a second indication signal. The control circuit controls the operation of the inverting circuit. The control circuit determines whether the amplitude of the AC output voltage is located within an operating voltage range during each driving cycles according to the first and the second indication signals, and decides whether to enable an overvoltage protection or an undervoltage protection to control the power conversion of the inverting circuit according to the determination results.