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Single-phase multiple-parameter electric power instrument

A power meter and multi-parameter technology, applied in the direction of multi-tester circuits, etc., can solve problems such as difficult linearity requirements, affect mass production, and accuracy cannot be guaranteed, and achieve high test accuracy, low power consumption, and multiple measurement parameters. Effect

Inactive Publication Date: 2009-05-20
SUZHOU WINFINE SMART ELECTRIC
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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.

Method used

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Embodiment Construction

[0016] see figure 2 , The sampling circuit is composed of voltage input circuit and current input circuit. Among them, the voltage input circuit can adapt to 0-100V, 0-220V, 0-380V; the current input circuit can adapt to 0-5A. The voltage signal terminals Uin*, Uin are connected to the measured voltage signal, and the voltage signal obtains the primary current through the resistors R38, R37, and voltage transformer TV1. If the input voltage signal is 220V, and the resistors R38, R37 are 110kΩ, the primary current is 1mA. The 1:1 voltage transformer TV1 generates an AC voltage of 50mV on the resistor R25 (50Ω), because the resistance of R25 is much smaller than the resistance of R26+R27 (2kΩ), so the accuracy and stability are determined by the resistors R37, R38, and R25. Resistors R25, R26, R27, R28 and capacitors C4, C5, C8 form a filter phase-shifting circuit, through the terminal Vin + 、Vin - Connected with the electric power measuring circuit, it is advisable to take 0...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/12
Inventor 徐文陆胜云
Owner SUZHOU WINFINE SMART ELECTRIC
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