CN103728485A

CN103728485A - Synchronous voltage detection device with protection function

Info

Publication number: CN103728485A
Application number: CN201310434891.7A
Authority: CN
Inventors: 姜建国; 戴鹏; 屠伟; 乔树通; 罗; 徐亚军
Original assignee: Shanghai Jiaotong University
Current assignee: North Jiangsu Institute Of Shanghai Jiao Tong University
Priority date: 2013-09-11
Filing date: 2013-09-11
Publication date: 2014-04-16
Anticipated expiration: 2033-09-11
Also published as: CN103728485B

Abstract

The invention relates to a synchronous voltage detection device with a protection function. The under voltage faults can be detected while the voltages are detected, and therefore the synchronous voltage detection device can have the protection function. The synchronous voltage detection device is mainly composed of an input terminal strip, a transformer module, a voltage detection module, a voltage conversion module, an under voltage detection module and an output signal terminal strip. Three phases of alternating voltages are reduced through the transformer module, voltage signals within the standard range are obtained through the voltage detection module, and the under voltage detection module can detect the under voltage faults of the alternating voltages. Compared with the prior art, the synchronous voltage detection device has the advantages of being simple in structure, easy to obtain and easy to install and detach, being capable of detecting the under voltage faults while synchronously detecting the alternating voltages, and being beneficial for improving stability of a system.

Description

The synchronizing voltage pick-up unit with defencive function

Technical field

The present invention relates to synchronizing voltage pick-up unit; be specifically related to a kind of synchronizing voltage pick-up unit with defencive function for AC-AC frequency converter control system; can, in synchronous detection alternating voltage, detect under-voltage fault, the stability of raising system operation.

Background technology

AC-AC frequency converter is widely used in the high power AC motor speed adjusting transmission fields such as mine hoist, blower fan, load of the pumps; the stability of the control system of AC-AC frequency converter plays vital effect; in order to solve the under-voltage failure problems in control system; the invention provides a kind of synchronizing voltage pick-up unit with defencive function for AC-AC frequency converter control system; can be in synchronous detection alternating voltage; detect under-voltage fault, the stability of raising system operation.

Summary of the invention

The present invention relates to a kind of synchronizing voltage pick-up unit with defencive function, when synchronous detection alternating voltage, if when under-voltage fault appears in alternating voltage, this device output fault-signal, sends to central processing unit, and handling failure, plays defencive function rapidly.

According to a kind of synchronizing voltage pick-up unit with defencive function provided by the invention, comprising: Input terminal block, transformer module, voltage detection module, voltage transformation module, under-voltage detection module, output signal terminal row;

Input terminal block, transformer module, voltage detection module, output signal terminal row connect successively, Input terminal block is also connected to voltage transformation module, under-voltage detection module, voltage transformation module is connected to voltage detection module, under-voltage detection module, voltage detection module is connected to under-voltage detection module, and under-voltage detection module is connected to output signal terminal row.

Preferably, transformer module, for reducing exchanging input side voltage magnitude, and plays the effect of isolation voltage.

Preferably, voltage transformation module, is second voltage for inputting the first voltage transitions, as the supply voltage in mimic channel.

Preferably, voltage detection module, for first trying to achieve two-phase voltage difference, then according to different input voltage grades, selects different switches, and the amplitude of regulation output voltage, obtains output voltage U.

Preferably, under-voltage detection module, the under-voltage fault occurring for detection of circuit.

Preferably, 1., 2., 3., 4., 5. Input terminal block comprises input terminal, wherein, input terminal 1., 2., three-phase alternating voltage UA, UB and UC that 3. access detects respectively, 4. and 5. terminal access ± 24V direct supply respectively.

Preferably, 1., 2., 3., 4., 5., 6., 7. lead-out terminal package draws together lead-out terminal, wherein, lead-out terminal 1., 2., 3. respectively the three-phase alternating current line voltage of output detections on the occasion of UAB, UBC and UCA, lead-out terminal 4., 5., the 6. three-phase alternating current line voltage negative value of output detections respectively

with

7. lead-out terminal exports under-voltage fault-signal.

Compared with prior art, advantage of the present invention is: simple in structure, be easy to realize, and be easy to installation and removal, in synchronous detection alternating voltage, under-voltage fault can be detected, be conducive to improve the stability of system.

Accompanying drawing explanation

By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:

Fig. 1 is the structure principle chart of synchronizing voltage pick-up unit;

Fig. 2 is the electrical schematic diagram of transformer module;

Fig. 3 is the electrical schematic diagram of voltage transformation module;

Fig. 4 is the electrical schematic diagram of voltage detection module;

Fig. 5 is the electrical schematic diagram of generating positive and negative voltage output;

Fig. 6 is the electrical schematic diagram of under-voltage detection module.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.

The present invention relates to a kind of synchronizing voltage pick-up unit with defencive function, when synchronous detection alternating voltage, if when under-voltage fault appears in direct supply, this device output fault-signal, sends to central processing unit, and handling failure, plays defencive function rapidly.

As shown in Figure 1, synchronizing voltage pick-up unit mainly consists of Input terminal block, transformer module, voltage detection module, voltage transformation module, under-voltage detection module, output signal terminal row.The input terminal of Input terminal block 1., 2., three-phase alternating voltage UA, UB and UC that 3. access detects respectively, 4. and 5. terminal access ± 24V direct supply respectively.Lead-out terminal row's lead-out terminal 1., 2., 3. respectively the three-phase alternating current line voltage of output detections on the occasion of UAB, UBC and UCA, lead-out terminal 4., 5., the 6. three-phase alternating current line voltage negative value of output detections respectively

with

7. lead-out terminal exports under-voltage fault-signal.This synchronizing voltage pick-up unit has Input terminal block and lead-out terminal row, and submodule that can be using it as control system, can be according to system needs, installation and removal.

As shown in Figure 2, the interchange input range of synchronizing voltage pick-up unit is 100V～500V, and transformer module reduces interchange input side voltage magnitude, and plays the effect of isolation voltage.As shown in Figure 3, voltage transformation module, be converted to ± 15V of will input ± 24V DC voltage voltage, as the supply voltage in mimic channel.Wherein represent respectively+24V of P24, M, N24, earth point and-24V.

As shown in Figure 4, the mimic channel that voltage detection module is built by amplifier amplifier forms, first by subtractor circuit, try to achieve two-phase voltage difference, then by voltage ratio amplifier, according to different input voltage grades, select different switches, the amplitude of regulation output voltage, obtains output voltage U.Because output voltage grade is different, can there be S1, S2, S3 and tetra-switches of S4 corresponding 500V, 400V, 230V and tri-different electric pressures of 100V respectively, obtain output voltage U.As shown in Figure 5, output voltage U again by phase inverter try to achieve output voltage on the occasion of UAB, UAC and UCA and negative value

with

by lead-out terminal, arrange output respectively, be conveyed into central processing unit for system computing.

As shown in Figure 6, for under-voltage detection module, regulating resistance R2 and utilize comparator C OMP can set different under-voltage threshold values, the under-voltage fault occurring in order to testing circuit, by LV detection chip comparative voltage, when there is under-voltage fault, red light H1 lights, and LV output jumps to low level from high level, causes amber light H2 to extinguish, output terminal F is fault-signal, by lead-out terminal, 7. exports.

Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims

1. a synchronizing voltage pick-up unit with defencive function, is characterized in that, comprising: Input terminal block, transformer module, voltage detection module, voltage transformation module, under-voltage detection module, output signal terminal row;

2. the synchronizing voltage pick-up unit with defencive function according to claim 1, is characterized in that, transformer module for reducing exchanging input side voltage magnitude, and plays the effect of isolation voltage.

3. the synchronizing voltage pick-up unit with defencive function according to claim 1, is characterized in that, voltage transformation module is second voltage for inputting the first voltage transitions, as the supply voltage in mimic channel.

4. the synchronizing voltage pick-up unit with defencive function according to claim 1, is characterized in that voltage detection module; for first trying to achieve two-phase voltage difference, then according to different input voltage grades, select different switches; the amplitude of regulation output voltage, obtains output voltage U.

5. the synchronizing voltage pick-up unit with defencive function according to claim 1, is characterized in that, under-voltage detection module, the under-voltage fault occurring for detection of circuit.

6. the synchronizing voltage pick-up unit with defencive function according to claim 1; it is characterized in that; Input terminal block comprises that input terminal 1., 2., 3., 4., 5.; wherein; input terminal 1., 2., three-phase alternating voltage UA, UB and UC that 3. access detects respectively, 4. and 5. terminal access ± 24V direct supply respectively.

7. the synchronizing voltage pick-up unit with defencive function according to claim 1; it is characterized in that; 1., 2., 3., 4., 5., 6., 7. lead-out terminal package draws together lead-out terminal; wherein; lead-out terminal 1., 2., 3. respectively the three-phase alternating current line voltage of output detections on the occasion of UAB, UBC and UCA, lead-out terminal 4., 5., the 6. three-phase alternating current line voltage negative value of output detections respectively

with

7. lead-out terminal exports under-voltage fault-signal.