Digital AC voltmeter module

Abstract

The invention relates to a digital AC voltmeter module suitable for an occasion which has low precision requirement and is sensitive to the cost, such as digital panels of the teaching equipment, portable equipment, handheld equipment and civilian industry product. The invention discloses a digital AC voltmeter module for solving a problem that the traditional digital voltmeter is high in cost, complex in structure and large in volume. The module comprises a rectifying circuit, a voltage-division circuit, a single chip microcomputer, a latching circuit, a power circuit and a display circuit; an output signal of the rectifying circuit is connected with the voltage-division circuit, the voltage-division circuit is connected with an input signal of the single chip microcomputer; the single chip microcomputer computes an average value of repeatedly sampled voltage values, thereby computing an effective value of the to-be-tested voltage, and controlling the latching circuit to drive the display circuit to display a voltage effective value; the single chip microcomputer is the single chip microcomputer with an analog-to-digital conversion function; an input signal of the power circuit isconnected with an external power supply, the output voltage of the power circuit supplies power for the internal of the digital AC voltmeter module, and is used as the reference voltage of the analog-to-digital conversion of the single chip microcomputer.

Description

technical field [0001] The invention relates to a digital AC voltmeter module, which is suitable for occasions that do not require high precision and are relatively sensitive to cost, such as teaching equipment, portable equipment, hand-held equipment, and digital panels of civil products. Background technique [0002] At present, with the development of electronic technology, the requirements for the accuracy of the measured voltage value are getting higher and higher. The traditional pointer voltmeter has single function, low precision and inconvenient reading, which cannot meet the needs of the digital age. The digital voltmeter came into being in this environment. It is an instrument that uses digital measurement technology to convert continuous analog quantities into discontinuous and discrete digital forms and display them. Compared with the pointer voltmeter, it has the advantages of high precision and convenient data reading. [0003] However, most of the current d...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a digital AC voltmeter module to solve the problems of high cost, complex structure and large volume of traditional digital voltmeters

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