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Electric current generating circuit, method and electric energy meter check meter

A current generating circuit and current signal technology, which is applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of unstable current amplitude and phase, and achieve the effect of stable current phase and amplitude

Active Publication Date: 2009-07-29
ZHUHAI KEHUI ELECTRICAL APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the resistance of the wiring and the internal resistance of different types of meters of the electric energy meter 61 are not the same, the amplitude and phase of the current flowing through the electric energy meter 61 often have a large difference. Amplitude and phase are often unable to stabilize and cannot meet the requirements of the national standard JJG1055-97, and the purpose of the present invention is to solve this problem

Method used

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  • Electric current generating circuit, method and electric energy meter check meter
  • Electric current generating circuit, method and electric energy meter check meter
  • Electric current generating circuit, method and electric energy meter check meter

Examples

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no. 1 example

[0037] see image 3 , the present embodiment consists of single-chip microcomputer 11, signal phase shifting and amplitude modulation circuit 12, power amplifier 13, signal adjustment circuit 14, A / D converter 15, signal adjustment circuit 16, A / D converter 17, switching power supply 18, current mutual inductance device CT2. Wherein, current transformer CT2, signal adjustment circuit 14, A / D converter 15 form the feedback link of this embodiment, single-chip microcomputer 11, signal phase-shifting and amplitude modulation circuit 12 and power amplifier 13 form the current signal adjustment circuit of this embodiment, The signal adjustment circuit 16 and the A / D converter 17 form the voltage signal sampling circuit of this embodiment.

[0038] In this embodiment, the terminals 1 and 3 are respectively connected to the live line L and the neutral line N of the power grid, and the terminal 2 is connected to the electric energy meter to output current to the electric energy meter...

no. 2 example

[0052] see Figure 5 , This embodiment includes a gear position controller 21, a signal phase shifting and amplitude modulation circuit 22, a power amplifier 23, a signal adjustment circuit 24, and a current transformer CT3. Among them, the current transformer CT3 and the signal adjustment circuit 24 constitute the feedback link, and the gear controller 21, the signal phase shifting and amplitude modulation circuit 22, and the power amplifier 23 constitute the current signal adjustment circuit of this embodiment.

[0053] The signal phase shifting and amplitude modulation circuit 22 of this embodiment is the same as the signal phase shifting and amplitude modulation circuit 12 of the first embodiment, and the signal adjustment circuit 24 is basically the same as the signal adjustment circuit 14 of the first embodiment, and will not be repeated here.

[0054] The gear controller 21 of the present embodiment includes a plurality of key switches, which are used to manually select...

no. 3 example

[0058] see Figure 6 , the present embodiment is made up of single-chip microcomputer 31, current generation circuit 32, power amplifier 33, signal adjustment circuit 34, A / D converter 35, signal adjustment circuit 36, A / D converter 37, switching power supply 38, current transformer CT4 . Wherein, the current transformer CT4, the signal adjustment circuit 34, and the A / D converter 35 form the feedback link of this embodiment, the single-chip microcomputer 31, the current generation circuit 32 and the power amplifier 33 form the current signal adjustment circuit of this embodiment, and the signal adjustment The circuit 36 ​​and the A / D converter 37 form the voltage signal sampling circuit of this embodiment.

[0059] Same as the first embodiment, the signal adjustment circuit 36 ​​and the A / D converter 37 sample the voltage signal in the grid, and transmit the voltage signal to the single-chip microcomputer 31 . At the same time, the single-chip microcomputer 31 also receives...

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Abstract

The invention provides a virtual current generation circuit and method, and an energy meter calibrator; the circuit comprises a current signal adjustment circuit, a feedback link as well as a voltage signal sampling circuit, wherein the output end of the current signal adjustment circuit outputs the current signals, the feedback link is used for adjusting the output current vector of the output end of the current signal adjustment circuit. The current generation method comprises setting the current phase position and amplitude which are output by the current signal adjustment circuit and outputting an initial current signal; the feedback link detects current signal from the output end of the current signal adjustment circuit and feeds back the detected current signal to the input end of the current signal adjustment circuit; and the current signal adjustment circuit judges whether the detected current signal phase position and amplitude are consistent with the set phase position and amplitude, if not, the phase position and amplitude of the output current is adjusted. The current generation circuit can output current with stable phase position and amplitude to an energy meter and ensure the accuracy of calibration errors of the energy meter.

Description

technical field [0001] The invention relates to a current generating circuit, in particular to a current generating circuit used in an electric energy meter calibrator and a method for using the circuit to generate current. Background technique [0002] In the power supply system, the power supply department needs to install a power meter for each user connected to the power supply network to calculate the power consumption of the user. The electric energy meter calculates the user's electricity consumption in terms of active power, and the calculation formula of active power P is: [0003] P=U×I×COSφ [0004] In the above formula, U is the voltage value measured by the electric energy meter, I is the current value measured by the electric energy meter, φ is the angle between the voltage and the current, which is called the power factor angle, and COSφ is the power factor of active power. [0005] Due to the unavoidable errors during the operation of the electric energy me...

Claims

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Application Information

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IPC IPC(8): G01R15/00G01R35/04
Inventor 朱亚军蔡晓航
Owner ZHUHAI KEHUI ELECTRICAL APPLIANCE CO LTD