Single phase voltage synchronization signal detection system and method

Abstract

The invention relates to a single phase voltage synchronization signal detection system. The single phase voltage synchronization signal detection system includes a power control module, an input voltage sampling module, an operational amplifier conditioning module, a micro processing module and a communication module, wherein the power control module is used for supplying power for the system; the input voltage sampling module is used for converting AC (Alternating Current) commercial power voltage into a 1-2.5V AC signal; the operational amplifier conditioning module is used for performing differential amplification and conditioning on the AC signal output from the input voltage sampling module and outputting an AC signal which changes according to a sine rule; the micro processing module is used for performing AD sampling on the AC signal output from the operational amplifier conditioning module, and obtaining a synchronization signal of AC voltage through comparison and determination of the obtained signal through sampling; and the communication module is used for realizing communication between a USB and a serial port. The invention also includes a single phase voltage synchronization signal detection method. By means of the single phase voltage synchronization signal detection system and method, and by means of combination of the advantages of hardware and the advantages of software, detection and output of the synchronization signal with high accuracy can be realized; communication between the synchronization signal and other main controllers becomes convenient; and the single phase voltage synchronization signal detection system and method have a wide application range.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to the technical field of single-phase voltage detection, in particular to a system and method for single-phase voltage synchronous signal detection. Background technique [0002] The three-phase voltages differ from each other by 120° electrical angle, and the midpoint of the three phases is the zero point of the voltage. Therefore, the synchronous signal of the three-phase voltage can be obtained by using the comparator to compare the change of each phase voltage relative to the zero point. [0003] But for a single-phase sinusoidal voltage, the neutral line (N) is not a stable zero-level potential, but fluctuates with the size of the live line (L) and the load. So it is difficult to obtain a level comparison signal with the live wire (L). [0004] At present, the commonly used method is to divide the single-phase sinusoidal voltage and then raise a DC level U 1 , a...

AI Technical Summary

Problems solved by technology

However, the above method has an obvious jitter process when the sinusoidal signal crosses zero, causing the comparator to output positive and negative pulse signals multiple times when the sinusoidal voltage crosses zero.

As a result, the obtained synchronization signal is not accurate enough, and the actual application effect is insufficient.

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