Single-phase multiple-parameter electric power instrument

Abstract

The invention relates to a single-phase multi-parameter electric power instrument which can provide a measuring instrument for a single-phase electric power parameter to realize the mensuration of a single parameter or multi-parameter of current, voltage, power factors, active power, reactive power and the like. The instrument comprises a sampling circuit, an electric power measuring circuit, a microprocessing singlechip circuit, a display circuit and a power supply circuit; the sampling circuit is connected with a voltage signal and a current signal; the electric power measuring circuit is connected with the sampling circuit and the microprocessing singlechip circuit; the display circuit is connected with the microprocessing singlechip circuit; and the power supply circuit provides power. The single-phase multi-parameter electric power instrument has the advantages that as the instrument adopts the electric power measuring circuit and the microprocessing singlechip circuit, the instrument has high testing precision and more measuring parameters; and the instrument adopts the mature chip in order to have small power consumption and be suitable for batch production.

Description

technical field [0001] The invention relates to a single-phase multi-parameter power instrument, which can provide a measuring instrument for single-phase power parameters, and realize single-parameter and multi-parameter measurement of current, voltage, power factor, active power, reactive power and frequency. Background technique [0002] Most of the power meters widely used at present adopt the structure and principle of electromagnetic meters. With the development of digital technology, digital power meters have also developed correspondingly in recent years. AD7107 dual-integration 3.5-digit AD converter or ICL7135 dual-integration 4.5-digit AD converter was first used, which is difficult to adapt to various range conversions. Linearity requirements, especially in the case of small signals, the accuracy cannot be guaranteed, and it is also difficult to solve the zero drift, and it can only be used for two types of ammeter and voltmeter. The second is the solution of AD...

AI Technical Summary

Problems solved by technology

With the development of digital technology, digital power meters have also developed correspondingly in recent years. AD7107 dual-integration 3.5-digit AD converter or ICL7135 dual-integration 4.5-digit AD converter was first used, which is difficult to adapt to various range conversions. Linearity requirements, especially in the case of small signals, the accuracy cannot be guaranteed, and it is also difficult to solve the zero drift, and it can only be used for two types of ammeter and voltmeter

The second is the AD converter, single-chip microcomputer, and light-emitting diode (LED) display scheme. In order to achieve the expected purpose, the design and debugging personnel are required to have a high technical level and rich practical experience, which affects mass production.

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