Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Constant current control system

A technology of constant current control and controller, applied in control/regulating systems, regulating electrical variables, instruments, etc., can solve the problems of high power and short life of the voltage drop regulator, reduce current, reduce heat consumption, The effect of increasing the rate of ascent

Inactive Publication Date: 2017-03-15
SHANGHAI UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the method of driving with a high and low voltage power supply can reduce the heat consumption of the voltage drop regulator in the constant current control system during constant current control, it is still unable to effectively solve the problem of the voltage drop of the voltage drop regulator in the constant current control system when the load changes greatly. The problem of high power and short life of the pressure drop regulator caused by large

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
  • Constant current control system
  • Constant current control system
  • Constant current control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A constant current control system, including a DC power supply 1 with a voltage E to the loop ground G, a DC power supply 1 according to the input voltage value V r To adjust the voltage V across c and e ce A controller 2, a two-terminal galvanometer 3, and a two-terminal load 4; it is characterized in that: the two-terminal load 4, the two ends of c and e of the controller 2 and the two-terminal galvanometer 3 are connected to the DC power supply 1 The voltage E and the loop ground G are connected in series to form a loop with a current I; the controller 2 is composed of an adjustable voltage V at both ends of c and e ce The pressure drop regulator 2.1 and a resistance value R connected in parallel at both ends of c and e d The shunt resistor 2.2 is composed; the voltage drop regulator 2.1 is based on the input voltage value V r To adjust the voltage V across c and e ce ; The shunt resistor 2.2 flows through the current I 2 =V ce / R d , and make the corresponding...

Embodiment 2

[0022] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0023] The two-terminal current detector 3 is a resistance fixed to R m The resistance of the current I produces a current-sensing voltage V m =R m ×I; the voltage drop regulator 2.1 will sense the current voltage V m As the input voltage value V r and with a value of V ref =R m ×I C Compared with the reference voltage, the drop regulator 2.1 increases or decreases the voltage V across c and e ce Make the sense voltage V m =R m The value of ×I is reduced or increased to achieve the current I equal to I C value for constant current control, here I C It is the constant current value that is expected to be achieved.

[0024] The resistance value R of the shunt resistor 2.2 d The internal resistance of the two-terminal load 4 is R L and loop current I=I C The following relationship should be satisfied:

[0025]

[0026] Such as figure 2 As shown, when one en...

Embodiment 3

[0029] The operational amplifier is used in the voltage drop regulator 2.1 of the controller 2. Due to the "common mode" characteristic of the operational amplifier, the potentials of the non-inverting input terminal and the inverting input terminal are almost equal, that is, the No. 2 connection of the operational amplifier U1 (or U2) The potential of the head to the loop ground G is almost equal to the voltage drop of the No. 3 connector of the operational amplifier U1 (or U2) to the loop ground G. Then, since the base current of transistor T1 (or transistor T2) is very small, the constant current value I C The size of depends only on the value of V ref The ratio of the reference voltage to the two-terminal current detector 3, that is, the constant current value I C =V ref / R m , which is the principle of constant current control system to achieve constant current control.

[0030] The resistance value R of the shunt resistor 2.2 d The internal resistance of the two-ter...

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 relates to a constant current control system comprising a DC power supply having a voltage E on loop ground G, a controller used for adjusting the c-e two-end voltage Vce according to an input voltage value Vr, a two-end current detector, and a two-end load; the two-end load, the c end and e end of the controller, and the two-end current detector are connected in series between the DC power supply voltage E and the loop ground G, thus forming a loop having a current I; the controller comprises a voltage drop regulator used for adjusting the c-e two-end voltage Vce and a shunt resistor connected in parallel with the c-e ends, wherein the shunt resistor resistance value is Rd; the constant current control system can reduce the current flowing through the voltage drop regulator in the controller, thus reducing the voltage drop regulator heat rate, and improving the constant current control system reliability.

Description

technical field [0001] The invention relates to the field of instruments and meters, and is a constant current control system for reducing the heat consumption of the voltage drop regulator by reducing the current flowing through the voltage drop regulator. Background technique [0002] Constant current control is to make the current flowing through the load constant. For example, constant current excitation is to make the current flowing through the excitation coil constant, so that the excitation coil generates a constant magnetic field. Generally, in a constant current control system where the power supply voltage is E, the load resistance is R, and the load inductance is L, the voltage drop V generated by the voltage drop regulator is changed. ce To control the loop current I, so that the loop current I is controlled at a constant current value I C . [0003] The loop current I rises from zero to the constant current value I C The time required is In many constant c...

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
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 李斌陈洁胡金根费琼曹毅杰
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com