CN205489475U - Small motor broken string protector - Google Patents
Small motor broken string protector Download PDFInfo
- Publication number
- CN205489475U CN205489475U CN201620131911.2U CN201620131911U CN205489475U CN 205489475 U CN205489475 U CN 205489475U CN 201620131911 U CN201620131911 U CN 201620131911U CN 205489475 U CN205489475 U CN 205489475U
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- operational amplifier
- outfan
- current sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a small motor broken string protector, current sampling circuit, integrated operational circuit, comparison circuit and relay output circuit, current sampling circuit is connected with three phase current's looks line terminal, integrated operational circuit's input is connected to current sampling circuit's output, integrated operational circuit's the output and the output of threshold value circuit are connected to comparison circuit's input, the input of pilot lamp and logic synthesis circuit is connected to comparison circuit's output, drive circuit's input is connected to the output of logic synthesis circuit, drive circuit's output terminal connected relay. The utility model discloses the change of simple structure, detectable undercurrent, the precision is high, safe and reliable.
Description
Technical field
This utility model relates to electronic technology field, relates in particular to a kind of small machine line disconnection protector.
Background technology
If can not discovery in time process during some three-phase load generation open-phase fault, normal production even can be affected
Cause the accident.For ensureing the properly functioning of motor, need to install protector additional on the loop that motor runs.
Traditional mode typically uses thermorelay, it be utilize bimetal leaf be heated deform upon different from
And drive drive mechanism to promote dynamic/static contact separately, thus disjunction loop protection motor.
But traditional thermorelay has limitation, its setting current has certain restriction.For electric current
The least motor, transships or the electric current that breaks can not cause the action of bimetal leaf, it is impossible to play well guarantor
Protect effect.Additionally, the small machine of application is essentially all unprotected and warning in factory, and small machine
Fault often affect the progress of production and the quality of product.
Utility model content
This utility model is for the problems referred to above weak point, it is provided that a kind of small machine line disconnection protector, can detect
The change of small area analysis, precision is high, safe and reliable.
The technical solution of the utility model is achieved in that
Small machine line disconnection protector, including: current sampling circuit, integrated operational amplifier circuit, comparison circuit and continue
Electrical equipment output circuit, described current sampling circuit is connected with the phase line end of three phase mains, described current sample electricity
The outfan on road connects the input of integrated operational amplifier circuit, the outfan of described integrated operational amplifier circuit and threshold value electricity
The outfan on road is connected to the input of described comparison circuit, and the outfan of described comparison circuit connects display lamp
With the input of logic synthesis circuit, the outfan of described logic synthesis circuit connects the input of drive circuit,
The outfan of described drive circuit connects relay.
Preferably, described three phase mains includes two groups, often organizes each phase line end correspondence respectively of three phase mains even
Connect current sampling circuit.
Preferably, described threshold circuit includes operational amplifier U4D and operational amplifier U4C, described computing
The positive input of amplifier U4D connects sliding contact and electric capacity C3, the described operation amplifier of potentiometer RW
The reverse input end of device U4D and the outfan positive input by resistance concatenation operation amplifier U4C, institute
Reverse input end and the outfan of stating operational amplifier U4C connect as Voltage Reference end Vref, described voltage
Reference edge Vref is connected to comparison circuit.
The shape small size current mutual inductor sampled current signals that this utility model uses secondary current to be mA level, through fortune
After amplification, more whether break with the duty comprehensive descision of load, finally disconnected electricity by relay output
The operating loop of machine, thus play the effect of protection motor.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the small machine line disconnection protector in this utility model；
Fig. 2 is the structure principle chart of the small machine line disconnection protector in Fig. 1；
Fig. 3 is the circuit theory diagrams of the small machine line disconnection protector in Fig. 2.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technical side in this utility model embodiment
Case is clearly and completely described, it is clear that described embodiment is only that this utility model part is real
Execute example rather than whole embodiments.Based on the embodiment in this utility model, ordinary skill people
The every other embodiment that member is obtained under not making creative work premise, broadly falls into this utility model
The scope of protection.
Unless otherwise defined, terminology used herein or scientific terminology should be belonging to this utility model
There is in field the ordinary meaning that the personage of general technical ability is understood.This utility model patent application specification with
And " first ", " second " that use in claims and similar word be not offered as any order,
Quantity or importance, and be used only to distinguish different ingredients.Equally, " one ", " one "
Or the similar word such as " it is somebody's turn to do " and does not also indicate that quantity limits, but represent and there is at least one." include "
Or the similar word such as " comprise " to mean to occur that the element before this word or object are contained and occur in this word
The element of presented hereinafter or object and equivalent thereof, and it is not excluded for other elements or object.On " ", D score,
Etc. being only used for representing relative position relation, after the absolute position being described object changes, then this relative position
Relation is likely to correspondingly change." connect " and be not limited to concrete type of attachment, can be to be directly connected to,
Can also be to be indirectly connected with by miscellaneous part, can be non-removable connection, it is also possible to be dismountable
Connect, can be electric or signal connection, it is also possible to be mechanically or physically to connect.
Figures 1 and 2 show that the structure of a kind of small machine line disconnection protector in this utility model embodiment is shown
It is intended to, as depicted in figs. 1 and 2, small machine line disconnection protector, including: current sampling circuit, integrated fortune
Electric discharge road, comparison circuit and outputting circuit for relay, current sampling circuit is connected with three phase mains, for right
The electric current of three phase mains is sampled, and the three phase mains in the present embodiment includes two groups, often organizes three phase mains
Phase line end connects current sampling circuit respectively, and the outfan of current sampling circuit connects the defeated of integrated operational amplifier circuit
Enter end, integrated operational amplifier circuit for sample rate current is carried out rectification amplification, the outfan of integrated operational amplifier circuit and
The outfan of threshold circuit is connected to the input of comparison circuit, comparison circuit electricity after rectification being amplified
Flowing the threshold value with threshold circuit to compare, the outfan of comparison circuit connects display lamp and logic synthesis circuit
Input, the outfan of logic synthesis circuit connects the input of drive circuit, the outfan of drive circuit
Connect relay.
In a particular application, after some load single-phase wire break, voltage is not 0 or the least, and electric current is always
It is 0.Therefore the shape small size current mutual inductor sampled current signals that this utility model uses secondary current to be mA level,
After amplifier is amplified, more whether break with the duty comprehensive descision of load, finally disconnected by relay output
Open the operating loop of motor, thus play the effect of protection motor.
As it is shown on figure 3, each phase line of three phase mains is all corresponding connects current sampling circuit, integrated transporting discharging
Circuit and comparison circuit, the present embodiment is as a example by the phase line that current transformer TA1 connects, corresponding
TA2 to TA6 is identical with TA1, is not repeating.
After current transformer TA1 gathers current signal, warp is connected to integrated operational amplifier circuit by resistance R2 and R3,
Integrated operational amplifier circuit includes that operational amplifier U1D, operational amplifier U1D use the fortune of LM224AN model
Calculating amplifier, the positive input of operational amplifier U1D connects resistance R2, and operational amplifier U1D's is anti-
The outfan connecting resistance R3, operational amplifier U1D to input connects resistance R5, resistance R5 and electricity
Being connected to comparison circuit after resistance R6 concatenation, comparison circuit is voltage comparator circuit, including comparator U1C, than
Relatively device U1C uses the comparator of LM224AN model, and the negative input of comparator U1C connects resistance
R6, the positive input of comparator U1C connects threshold circuit by resistance R7, and threshold circuit includes computing
The positive input of amplifier U4D and operational amplifier U4C, operational amplifier U4D connects potentiometer RW
Sliding contact and one end of electric capacity C3, the reverse input end of operational amplifier U4D and outfan by electricity
Resistance R67 concatenation operation amplifier U4C positive input, the reverse input end of operational amplifier U4C and
Outfan connects the forward input connecting comparator U1C as Voltage Reference end Vref, Voltage Reference end Vref
End.
Further, comparator U1C, comparator U1B, comparator U2C outfan respectively with corresponding
Diode D1, diode D2, the positive pole of diode D3 connect, diode D1, diode D2, two poles
The negative pole of pipe D3 is commonly connected to one end of resistance R61, corresponding, comparator U2B, comparator U3C,
The outfan of comparator U3B respectively with corresponding diode D4, diode D5, the positive pole of diode D6
Connecting, diode D4, diode D5, the negative pole of diode D6 are commonly connected to one end of resistance R62,
Additionally, the outfan of each comparator inputs jointly to logic synthesis circuit, logic synthesis circuit includes septuple
Darlington transistor battle array IC1, septuple Darlington transistor battle array IC1 uses ULN2004 model, and septuple reaches woods
The outfan of transistor array IC1 of pausing connects LED light and relay K A1.
In the present embodiment, the other end of resistance R61 and resistance R62 is respectively connecting to drive circuit, drives electricity
Road includes transistor Q1 and transistor Q2, and the colelctor electrode of transistor Q2 connects resistance R62, transistor Q2
Emitter stage and the emitter stage common ground of transistor Q1, the base stage of transistor Q2 pass through resistance R72 and company
The locked end 2 connecing port connects, and the base stage of transistor Q1 is by the locked end 1 of resistance R71 with connectivity port
Connect.
This utility model can solve the problem that thermorelay can not protect small machine, it is achieved that breaks small machine
Line is protected, and has saved cost to a certain extent, has decreased product defect rate, has improve manufacturing schedule and effect
Rate, reduces the investigation difficulty of small machine fault.
These are only preferred embodiment of the present utility model, not in order to limit this utility model, all
Within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, all should wrap
Within being contained in protection domain of the present utility model.
Claims (3)
1. small machine line disconnection protector, it is characterised in that including: current sampling circuit, integrated operational amplifier circuit,
Comparison circuit and outputting circuit for relay, described current sampling circuit is connected with the phase line end of three phase mains, institute
The outfan stating current sampling circuit connects the input of integrated operational amplifier circuit, described integrated operational amplifier circuit defeated
The outfan going out end and threshold circuit is connected to the input of described comparison circuit, the output of described comparison circuit
End connects display lamp and the input of logic synthesis circuit, and the outfan of described logic synthesis circuit connects driving
The input of circuit, the outfan of described drive circuit connects relay.
Small machine line disconnection protector the most according to claim 1, it is characterised in that described three phase mains
Including two groups, each phase line end often organizing three phase mains is connected respectively current sampling circuit.
Small machine line disconnection protector the most according to claim 2, it is characterised in that described threshold circuit
Including operational amplifier U4D and operational amplifier U4C, the positive input of described operational amplifier U4D
Connect the sliding contact of potentiometer RW and the reverse input end of electric capacity C3, described operational amplifier U4D and defeated
Going out the end positive input by resistance concatenation operation amplifier U4C, described operational amplifier U4C's is reverse
Input and outfan connect as Voltage Reference end Vref, and it is electric that described Voltage Reference end Vref is connected to comparison
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620131911.2U CN205489475U (en) | 2016-02-19 | 2016-02-19 | Small motor broken string protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620131911.2U CN205489475U (en) | 2016-02-19 | 2016-02-19 | Small motor broken string protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205489475U true CN205489475U (en) | 2016-08-17 |
Family
ID=56678588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620131911.2U Expired - Fee Related CN205489475U (en) | 2016-02-19 | 2016-02-19 | Small motor broken string protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205489475U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787999A (en) * | 2016-12-23 | 2017-05-31 | 惠州市蓝微电子有限公司 | The startup localization method and its circuit of a kind of direct-current brushless no-hall motor |
-
2016
- 2016-02-19 CN CN201620131911.2U patent/CN205489475U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787999A (en) * | 2016-12-23 | 2017-05-31 | 惠州市蓝微电子有限公司 | The startup localization method and its circuit of a kind of direct-current brushless no-hall motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20190219 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |