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Single-phase electric energy metering chip

An electric energy metering chip, single-phase technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of increased computational complexity and achieve the effect of great design flexibility

Active Publication Date: 2017-05-03
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is a three-phase multi-function smart meter, its computational complexity will increase a lot

Method used

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  • Single-phase electric energy metering chip
  • Single-phase electric energy metering chip

Examples

Experimental program
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Effect test

Embodiment approach 1

[0043] Such as figure 1 and figure 2 As shown, the single-phase electric energy metering chip structure of the present invention has the following modules:

[0044] image 3 for figure 2The specific structure and signal flow schematic diagram of the sampling and analog-to-digital conversion module 101, wherein, the dotted line box represents the signal flow in this module, in this embodiment, the sampling and analog-to-digital conversion module 101 is used to respectively sample the current and voltage and converted to a numeric value, such as image 3 As shown, it includes a programmable gain amplifier PGA1011 and an analog-to-digital converter ADC1012 connected in sequence to sample the current and voltage respectively, and generate current sampling digital values ​​and voltage sampling digital values. Since the sampled current signal is very small, the programmable gain amplifier PGA1011 is usually required to amplify the sampled current signal. Similarly, the sampled...

Embodiment approach 2

[0080] Figure 11 It is a structural diagram of extending the electric energy metering structure of the present invention to a three-phase electric energy metering chip, but its basic structure and principle are the same as those in Embodiment 1.

[0081] First, the analog values ​​of the ABC three-phase current and voltage are sampled separately, and the electric energy metering chip of the present invention is used for phase-separated metering, and the effective value of the A-phase current, the effective value of the A-phase voltage, the apparent power of the A-phase, and the A-phase Reactive power, A-phase active power; B-phase current RMS, B-phase voltage RMS, B-phase apparent power, B-phase reactive power, B-phase active power; and, C-phase current RMS, C-phase voltage effective value, C-phase apparent power, C-phase reactive power, and C-phase active power. Since the three items of ABC are sampled and calculated respectively, phase A is taken as an example for illustra...

Embodiment approach 3

[0087] This embodiment is a modified example of Embodiment 2, such as Figure 12 As shown, first, the currents and voltages of the three phases A\B\C are respectively sampled and converted, and after passing through the three-phase sampling and analog-to-digital conversion module 301 composed of the sampling and analog-to-digital conversion module 101, A\B\C are respectively obtained C Three-phase current\voltage sampling digital value.

[0088] At this time, select the sub-phase that needs to be measured through the selection module 302, and if it is necessary to select the sub-phase A for calculation, the sampled digital value of the voltage of phase A and the sampled digital value of the current of phase A are passed. This option can be designed with clock multiplexing, that is, within a certain period of time, the A-phase electric energy measurement, B-phase electric energy measurement and C-phase electric energy measurement are respectively calculated for the phase combin...

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Abstract

The invention provides a single-phase electric energy metering chip. The single-phase electric energy metering chip comprises a full-waveform module which is connected with a sampling and analog-to-digital conversion module, a fundamental wave separation module which is connected with the full-waveform module, an effective value calculation module which is connected with the full-waveform module and the fundamental wave separation module, an active power calculation module which is connected with the full-waveform module and the fundamental wave separation module, a reactive power calculation module which is connected with the full-waveform module and the fundamental wave separation module, an apparent power calculation module which is connected with the effective value calculation module, a power factor calculation module which is connected with the apparent power calculation module and the active power calculation module, an Nth-degree harmonic separation calculation module, and an energy calculation module. The single-phase electric energy metering chip can flexibly choose the calculation of the active power, the reactive power, the apparent power and the power factor of full-wave, fundamental wave and each harmonic and the electric energy metering of active, reactive and apparent energy.

Description

technical field [0001] The invention belongs to the technical field of electric energy metering, and relates to a single-phase electric energy metering chip. Background technique [0002] At present, the multi-functional requirements of electronic energy meters are becoming more and more important in the application of smart grids. With the development of smart grids, in the field of energy metering chips, the chips are required to have flexible design solutions and multi-functional metering requirements. And can complete various power quality management controls, such as anti-theft design. [0003] Energy metering is mainly to process the sampled current and voltage signals through various signal processing, and selectively obtain electric energy metering values ​​such as current and voltage effective values, active power, reactive power, apparent power, power factor, and active and reactive apparent energy. . Electronic energy meters use digital signal processing methods...

Claims

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Application Information

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IPC IPC(8): G01R22/10
CPCG01R22/10
Inventor 王祥莉袁文师
Owner SHANGHAI BEILING
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