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Electronic watthour meter

A watt-hour meter and electronic technology, which is applied in the direction of electric vehicles, electrical devices, and measurement of electric power, can solve problems such as insufficient resolution, and achieve the effect of reducing cost and product size

Inactive Publication Date: 2012-06-13
OSAKI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an A / D converter included in a microcomputer generally used as an operation processing device usually has only a resolution of 10 bits or a maximum of 12 bits, so that in an electronic watt-hour meter using such a general-purpose microcomputer, the resolution not enough

Method used

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Examples

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Embodiment Construction

[0048] Next, the best mode for carrying out the present invention will be described.

[0049] image 3 is a block diagram showing an outline of the circuit configuration of the single-phase two-wire electronic watt-hour meter according to the present embodiment. also, Figure 4 for image 3 Partial detailed circuit diagram of the block diagram shown. exist image 3 and 4 in, with figure 1 The same or corresponding parts in will be marked with the same reference numerals and characters.

[0050] The electronic watt-hour meter according to the present invention is configured to include a voltage sensor 13 , a current sensor 14 , a general-purpose microcomputer 21 and a liquid crystal display section 6 . A microcomputer 21 configured as an operation processing device includes a selection switch 22, a differential amplifier 23, an A / D converter 24, a software processing section 25, a liquid crystal display driver 5, and an LED 15, and the circuit ground (GND) is connected t...

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Abstract

A conventional electronic watthour meter cannot achieve sufficient miniaturization and cost reduction. In the inventive electronic watthour meter, the detection outputs of a voltage sensor (13) and a current sensor (14) and the reference potential of the current sensor (14) are amplified differentially by a differential amplifier (23) and then A / D converted by an A / D converter (24) through Delta-Sigma modulation under control of a software processing section (25). The A / D converted reference potential is then removed from the A / D converted detection outputs of the voltage sensor (13) and the current sensor (14), respectively, thus calculating the electric energy used by a measurement object. A correction processing for the absolute error of the electric energy used in performed by gain regulation processing only. The calculated electric energy used is displayed at a liquid crystal display section (6) under control of a liquid crystal driver (5), and delivered, as a pulse signal, to an LED (15).

Description

technical field [0001] The invention relates to an electronic watt-hour meter for calculating the used electric energy of a measured object according to a digital signal transformed by an analog-to-digital (A / D) conversion device. Background technique [0002] The measurement accuracy guarantee range of the electronic watt-hour meter is usually about ±10% of the rated value for the voltage, and a wide range of 6 times to 1 / 40 times the rated value for the current. Therefore, in order to measure the current within the guaranteed measurement range with ±1% accuracy, the resolution is required to be 1 / 240×1%=1 / 24,000, that is, 1 / 24000, thus requiring the resolution of the A / D converter to be 15 bits or so. However, an A / D converter included in a microcomputer generally used as an operation processing device usually has only a resolution of 10 bits or a maximum of 12 bits, so that in an electronic watt-hour meter using such a general-purpose microcomputer, the resolution That'...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R22/00G01R21/00
CPCG01R21/133
Inventor 吴一宪吉川法子
Owner OSAKI ELECTRIC CO LTD
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