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Power grid voltage detection circuit

A technology for detecting circuit and grid voltage, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problem of high cost

Inactive Publication Date: 2016-02-17
NANJING APAITEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the market competition is becoming increasingly fierce, and the hardware requirements of low cost and high reliability are becoming more and more important to the product. Due to the high cost of the grid voltage detection method used in the past

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Embodiment Construction

[0015] Such as figure 2 As shown, the invention discloses a grid voltage detection circuit, which includes a three-phase differential voltage detection circuit and a star circuit. The invention includes 3 double operational amplifier chips and 52 patch resistors. The three dual operational amplifier chips U1, U2, and U3 are LM258; the resistor R19 is 0Ω, and the resistors R1 to R18 are all 430KΩ. Resistors R20, R21, R24, R25, R31, R32, R35, R36, R42, R43, R46, R47 are 1MΩ, resistors R22, R26, R33, R37, R44, R48 are 887KΩ, resistors R23, R27, R34, R38 , R45, R49 are 22KΩ, resistors R28, R29, R39, R40, R50, R51 are 34KΩ, R30, R41, R52 are 28KΩ.

[0016] Phase A of the differential sampling detection circuit includes an operational amplifier U1A and 11 resistors R20 to R30. One end of the resistor R20 is connected to the A-phase line Uai of the power grid, and the other end is connected to the resistor R21; the other end of the resistor R21 is connected to the resistor R22; t...

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Abstract

The invention provides a power grid voltage detection circuit. The power grid voltage detection circuit includes a difference voltage detection circuit and a star circuit, wherein the difference voltage detection circuit is electrically connected with the star circuit. The power grid voltage detection circuit exchanges a previous common voltage transformer sampling circuit as a difference sampling circuit, thus reducing the cost. The power grid voltage detection circuit increases the star circuit which is formed by chip resistors so that the circuit becomes more reliable and flexible; and the star circuit is suitable for a three-phase three-wire system and a three-phase four-wire system of power grid phase voltage sampling, thus unifying the processing of the power grid voltage through a program and at the same time improving the reliability of the product.

Description

technical field [0001] The invention relates to a grid voltage detection circuit inside an active filtering product. Background technique [0002] Grid voltage detection circuit is an essential part of active filter products, and it is related to whether active filter products can correctly detect the value of grid voltage. Whether the grid voltage is detected correctly or not directly affects the normal grid-connected operation of the product. Currently commonly used power grid voltage detection circuit such as figure 1 As shown, it uses a voltage transformer to convert the grid voltage into a small voltage signal, then sends it to the sampling conditioning circuit, and finally sends it to the DSP for processing. [0003] At present, the market competition is becoming increasingly fierce, and the hardware requirements of low cost and high reliability are becoming more and more important to the product, because the cost of the grid voltage detection method used in the past...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 罗晓珊张明仇志凌葛文海
Owner NANJING APAITEK TECH
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