CN2881741Y - Digital automatic AC constant-current source - Google Patents
Digital automatic AC constant-current source Download PDFInfo
- Publication number
- CN2881741Y CN2881741Y CN 200620025336 CN200620025336U CN2881741Y CN 2881741 Y CN2881741 Y CN 2881741Y CN 200620025336 CN200620025336 CN 200620025336 CN 200620025336 U CN200620025336 U CN 200620025336U CN 2881741 Y CN2881741 Y CN 2881741Y
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- Prior art keywords
- pressure regulator
- servo pressure
- control system
- motor
- current
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- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The utility model relates to a digital automatic AC constant-current source, which comprises an electric servo voltage regulator, a step-down transformer, a motor-driven mechanism of the servo voltage regulator, a current detection mechanism and a control system center; the primary of the electric servo voltage regulator is feeded with 220V, utility power, its secondary is connected with the primary of the step-down transformer, which is connected with a resistor and forms a loop. The detected sample signal is transmitted to the control system center via a current transducer, the control system center will compare the sample current value with the set current value and then transmit the motor rotation direction signal and the power-on time signal of the servo voltage regulator to the motor of the servo regulator via the motor-driven mechanism of the servo voltage regulator. The digital constant-current source has high precision with the constant-current precision of plus or minus 1 per cent and due to the full-digital closed loop engineering program control, it has high reliability.
Description
Affiliated technical field
The utility model belongs to a kind of supply unit, particularly relates to a kind of digital full-automatic AC constant current source.
Background technology
In present known process of similar devices such as isolating switch being carried out the current protection attribute testing, need provide constant electric current to experimentize, constant current source is the simulation constant current source mostly at present, and precision is low, and response speed is slow.
The utility model content
The utility model provides a kind of precision higher for solving the technical matters that exists in the known technology, the digital faster full-automatic AC constant current source of response speed.
The technical scheme that the utility model is taked for the technical matters that exists in the solution known technology is: it includes motor drive, several parts of current sensing means and control system center of electrical servo pressure regulator, step-down transformer, servo pressure regulator; The elementary civil power 220V voltage that connects of electrical servo pressure regulator, it secondary connects the elementary of step-down transformer, secondary and the resistance of step-down transformer links to each other and constitutes the loop, and by the sampled signal input control system center of current transformer with detection, the control system center with the current value ratio of sample rate current value and setting after, the motor rotation direction signal of the motor drive output electrical servo pressure regulator by servo pressure regulator and electrical servo pressure regulator motor power up the motor that time signal is given servo pressure regulator.
The utility model can also adopt following technical measures:
Described control system center can be industrial control computer, single-chip microcomputer or PLC.
Advantage and the good effect that the utlity model has are: this digital constant-current accuracy height, constant current accuracy is ± 1%, by the closed-loop control of control system central program full digital, reliability height.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1, electrical servo pressure regulator T4, T5 are step-down transformer, and T5 time level has two groups of 9V, 45V to be controlled the tap of break-make respectively by relay J 18, J19, J20, J21 and J01, J02, J03, J04.Current transformer C imports industrial computer with the sample rate current value by secondary C31 and C32 two ends.Industrial computer is by the break-make of J22 being realized the selection of the making alive U of institute in the loop, by the break-make of J23 being realized adding in the loop selection of resistance R.G01, G02, G03, G04 and G05, G06, G07, G08 are the two ends of load of the present utility model.Its course of work at first is: the elementary civil power 220V voltage that connects of electrical servo pressure regulator T4, it secondary connects the elementary of step-down transformer T5, the secondary low-voltage that promptly obtains of step-down transformer T5 like this, this low-voltage links to each other with resistance R and constitutes the loop, produce electric current in the loop, and by the signal input industrial computer of current transformer C sampling with detection, industrial computer compares the current value of actual current value that obtains and setting, industrial computer is according to two control signals of this difference output, one is the direction signal of electrical servo pressure regulator T4: i.e. pilot relay J1, J2 selects servomotor M1 rotating, another is the time signal that powers up of electrical servo pressure regulator T4, it is pilot relay J1 or J2 time of closing contact, the time of this signal high-low level looks into difference between current and powers up time corresponding tables acquisition by industrial computer, the motor drive that industrial computer is exported to servo pressure regulator T4 to these two control signals is controlled electrical servo pressure regulator T4 motor, will obtain a new current value like this, when current stabilization after setting value, pressure regulator T4 stops operating, if electrical network has fluctuation or industrial computer to reset current value, then servo pressure regulator T4 continues to adjust, and reaches setting value and makes current constant up to current value.
Single-chip microcomputer, PLC etc. also can be adopted in the control system center except can adopting industrial control computer.
Claims (2)
1. digital full-automatic AC constant current source, it is characterized in that: it includes motor drive, several parts of current sensing means and control system center of electrical servo pressure regulator, step-down transformer, servo pressure regulator; The elementary civil power 220V voltage that connects of electrical servo pressure regulator, it secondary connects the elementary of step-down transformer, secondary and the resistance of step-down transformer links to each other and constitutes the loop, and by the sampled signal input control system center of current transformer with detection, the control system center with the current value ratio of sample rate current value and setting after, the motor rotation direction signal of the motor drive output electrical servo pressure regulator by servo pressure regulator and electrical servo pressure regulator motor power up the motor that time signal is given servo pressure regulator.
2. digital full-automatic AC constant current source according to claim 1 is characterized in that: described control system center can be industrial control computer, single-chip microcomputer or PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620025336 CN2881741Y (en) | 2006-02-14 | 2006-02-14 | Digital automatic AC constant-current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620025336 CN2881741Y (en) | 2006-02-14 | 2006-02-14 | Digital automatic AC constant-current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2881741Y true CN2881741Y (en) | 2007-03-21 |
Family
ID=37881582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620025336 Expired - Fee Related CN2881741Y (en) | 2006-02-14 | 2006-02-14 | Digital automatic AC constant-current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2881741Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090615A (en) * | 2014-07-04 | 2014-10-08 | 天津市百利电气有限公司 | High-precision voltage stabilizing circuit and voltage stabilizing method |
| CN105892539A (en) * | 2015-08-22 | 2016-08-24 | 滁州职业技术学院 | Two-wire system electric voltage regulator |
-
2006
- 2006-02-14 CN CN 200620025336 patent/CN2881741Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090615A (en) * | 2014-07-04 | 2014-10-08 | 天津市百利电气有限公司 | High-precision voltage stabilizing circuit and voltage stabilizing method |
| CN105892539A (en) * | 2015-08-22 | 2016-08-24 | 滁州职业技术学院 | Two-wire system electric voltage regulator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070321 Termination date: 20120214 |