AC voltage isolation sampling circuit

An isolation sampling, AC voltage technology, applied in voltage/current isolation, measurement of electrical variables, measurement using digital measurement technology, etc., can solve problems such as low sampling accuracy, large current loss, unsatisfactory anti-interference and linearity effects, etc. , to achieve the effect of improved sampling accuracy, low sampling error and good fault alarm function

Inactive Publication Date: 2021-08-24
浙江万松电气有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to solve the technical problems of large current loss, low sampling accuracy, and unsatisfactory anti-interference and linear effects in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • AC voltage isolation sampling circuit
  • AC voltage isolation sampling circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] see Figure 1-2 , an AC voltage isolation sampling circuit, comprising:

[0046] AC power supply 100, AC power supply 100 is 220V AC power supply;

[0047] see figure 1 with figure 2 , the amplifier A1 200 is set at the output end of the above-mentioned AC power source 100, specifically, the output end of the AC power source 100 is connected to the positive end of the amplifier A1 200, and the current of the AC power source 100 is I1, and the voltage is U1, and the amplifier A1 200 is only for The current of the AC power supply 100 is amplified to obtain an amplified current k·I1, wherein k>1;

[0048] see figure 1 with figure 2 , the output end and the negative end of the AC power supply 100 are respectively provided with a secondary filter unit 400 and a primary filter unit 300, and then the current and voltage at the output end of the amplifier A1 200 are well filtered to eliminate the effect of the amplifier A1 200. The ripple interference, specifically, the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an AC voltage isolation sampling circuit, and belongs to the technical field of power electronics.The AC voltage isolation sampling circuit comprises: an AC power supply; an amplifier A1 which is used for amplifying the current of the alternating current power supply, wherein the output end of the alternating current power supply is connected with the input end of the amplifier A1; a filtering mechanism which is used for realizing filtering, wherein the output end of the amplifier A1 is connected with the input end of the filtering mechanism; a first-stage high-frequency rectification unit which is used for realizing high-frequency rectification, wherein the output end of the filtering mechanism is connected with the input end of the first-stage high-frequency rectification unit; a voltage division unit which is used for realizing voltage division, wherein the output end of the first-stage high-frequency rectification unit is connected with the input end of the voltage division unit; a negative pressure unit, wherein one output end of the voltage dividing unit is connected with the input end of the negative pressure unit; and an amplifier A2 which is used for amplifying the current of one branch of the voltage division unit. The invention aims to solve the technical problems of large current loss, low sampling precision and unsatisfactory anti-interference and linear effects in the prior art.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to an AC voltage isolation sampling circuit. Background technique [0002] At present, the AC voltage sampling usually adopts the AC transformer isolation sampling technology. The AC transformer is the core device of AC sampling. Since the AC rated voltage is generally 220VAC, which belongs to the medium and high voltage level, the primary winding of the transformer is the same when the wire diameter and magnetic core specification are the same. Larger inductive reactance is required to meet the current requirements allowed by the winding wire package, and the following two methods are usually adopted to increase the inductive reactance of the transformer: 1. Increase the number of turns; 2. Increase the magnetic core. Using these two methods to increase the inductance of the transformer will increase the volume of the transformer, and the winding process ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): G01R15/14G01R19/25
CPCG01R15/144G01R19/25
Inventor南志超王重胜陈夏林一河
Owner浙江万松电气有限公司