CN207218218U - A kind of current foldback circuit - Google Patents
A kind of current foldback circuit Download PDFInfo
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- CN207218218U CN207218218U CN201720973259.3U CN201720973259U CN207218218U CN 207218218 U CN207218218 U CN 207218218U CN 201720973259 U CN201720973259 U CN 201720973259U CN 207218218 U CN207218218 U CN 207218218U
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- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims description 10
- 238000005284 basis set Methods 0.000 claims description 7
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 6
- 229910052753 mercury Inorganic materials 0.000 claims description 6
- 230000002262 irrigation Effects 0.000 abstract 1
- 238000003973 irrigation Methods 0.000 abstract 1
- 230000001012 protector Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a kind of current foldback circuit; its drip irrigation device is to include transformer, be connected to the rectifier bridge of Circuit Fault on Secondary Transformer, and signal sample circuit, signal amplification circuit, signal comparator circuit and on-off circuit are also connected with turn on the primary side of transformer；Signal sample circuit exports sampled signal to gather the current signal of transformer primary side, signal amplification circuit is receiving sampled signal and export sampled signal enhanced processing to signal comparator circuit, for signal comparator circuit to judge whether excessively stream and export judgement signal, on-off circuit controls the break-make of transformer primary side circuit according to signal is judged.Raising circuit reliability is reached, more energy-saving safe efficiently acts on.
Description
Technical field
It the utility model is related to electric power change-over circuit technical field, more particularly to a kind of current foldback circuit.
Background technology
In power supply, it is necessary to according to the requirement of user, production can continue the circuit of voltage conversion, most common
Some supply units, its main circuit structure includes civil power 220V input, transformer, rectifier bridge and output end, defeated
Entering end connection on the transformer, transformer can be depressured, and rectifier bridge is connected between the secondary side of transformer and output end,
Meet the electric power of voltage class so as to export and be used for other equipment.
For over-current phenomenon avoidance occurs often on transformer primary side, protected in the prior art frequently with overcurrent protector
Shield, although overcurrent protector can solve above-mentioned technical problem, overcurrent condition incision power-off can occur in transformer primary side
Road is effectively protected, and still, in use if input electric current is normal, overcurrent protector can not recover user automatically
The connection of circuit, cause to use upper inconvenience, in addition, the detecting reliability for overcurrent condition is not also high.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of current foldback circuit, having can
By detection line road overcurrent condition and overcurrent protection is carried out, the advantage of circuit connection can be recovered automatically after overcurrent condition removal.
Above-mentioned technical purpose of the present utility model technical scheme is that：A kind of overcurrent protection electricity
Road, including transformer, the rectifier bridge for being connected to Circuit Fault on Secondary Transformer, signal is also connected with turn on the primary side of the transformer
Sample circuit, signal amplification circuit, signal comparator circuit and on-off circuit；
Signal sample circuit to gather the current signal of transformer primary side output sampled signal, use by signal amplification circuit
To receive sampled signal and export sampled signal enhanced processing to signal comparator circuit, signal comparator circuit is judging whether
Excessively stream simultaneously exports judgement signal, and on-off circuit controls the break-make of transformer primary side circuit according to signal is judged.
By above-mentioned setting, signal sample circuit has carried out current sample to this part circuit of power input, collection
To signal handled by signal amplification circuit, the order of accuarcy of signal acquisition can be effectively improved, sampled signal output
Small-signal easily by external interference, if be directly compared processing will produce larger error, this programme believes this
Number compare again after enhanced processing in advance, afterwards, the judgement signal reliability of output is higher, judges that signal inputs to on-off circuit,
On-off circuit realizes the action protection of transformer primary side circuit, when over-current phenomenon avoidance disappearance, the shape that on-off circuit resiles again
State.
Can be preferably as concrete scheme of the present utility model：The signal sample circuit includes resistance R9, resistance R8
And electric capacity C4, resistance R9 one end as input and connect resistance R8 one end, resistance R9 other ends ground connection, resistance R8's is another
One end connects electric capacity C4 one end and as output, electric capacity C4 other end ground connection.
By above-mentioned setting, electric current is decayed by resistance R9, and low current signal afterwards is gone by resistance R8 and electric capacity C4
Except ripple disturbs, the electric current finally sampled is exported.
Can be preferably as concrete scheme of the present utility model：The signal amplification circuit include amplifier, resistance R6,
Resistance R7 and electric capacity C3, the in-phase end connection sample circuit output end of amplifier, the inverting input connection resistance of amplifier
R6 one end, electric capacity C3 one end and resistance R7 one end, resistance R7 other ends ground connection, electric capacity C3 other ends connection resistance R6 are another
End and the output end of amplifier.
By above-mentioned setting, after the amplification that the electric current of sampling passes through amplifier, the intensity of sample rate current can be expanded, together
The stability of Shi Tigao sampled signals.
Can be preferably as concrete scheme of the present utility model：Signal comparator circuit includes comparator, resistance R5, current potential
Device Rp and electric capacity C2, the output end of the inverting input connection amplifier of comparator, the in-phase input end connection electricity of comparator
Hold C2 one end and the adjustable side of potentiometer, resistance R5 one end connection 5V voltages, resistance R5 other ends connection potentiometer Rp one end, electricity
The position device Rp other ends and electric capacity C2 other ends ground connection.
By above-mentioned setting, potentiometer Rp can set threshold value by adjusting itself resistance size, so as to actual electricity
Flowing size, whether excessively stream makes comparative judgments.When overcurrent condition occurs, comparator output low level, otherwise comparator output is high electric
It is flat.
Can be preferably as concrete scheme of the present utility model：The on-off circuit include relay K1, triode Q1,
Electric capacity C1, resistance R1, resistance R2, resistance R3, resistance R4 and indicator lamp, instruction lamp anode connection voltage, instruction lamp cathode connect
Connecting resistance R2 one end, resistance R2 other ends connection diode D1 negative electrodes, resistance R3 one end and signal comparator circuit output end, electricity
Hinder R3 other ends connection resistance R4 one end, resistance R4 other ends ground connection, diode D1 anodes connection resistance R1 one end, electric capacity C1 mono-
End and triode Q1 basis sets, the resistance R1 other ends connection voltage, the electric capacity C1 other ends ground connection, triode Q1 colelctor electrode connection after
Electrical equipment K1, triode Q1 grounded emitter, relay K1 other end connection voltage, relay K1 normally-closed contact are connected to
On the incoming line of transformer primary side.
By above-mentioned setting, when over-current phenomenon avoidance occurs, comparison circuit exports low level, and now indicator lamp is lighted,
Electric capacity C1 is discharged by diode D1, so as to which triode Q1 basis set is in low level, triode Q1 conductings, so as to relay
Device K1 energized actions, relay K1 normally-closed contact disconnect, have cut off the input of power supply, played a part of overcurrent protection.When outer
When portion's input current recovers normal, comparison circuit exports high level, and now indicator lamp does not work, and electric capacity C1 can not pass through diode D1
Discharged, make it that triode Q1 basis set voltage is higher so as to which electric capacity C1 is in charged state, triode Q1 is in cut-off shape
State, relay K1 must not be electric, and the normally-closed contact of relay restPoses, so as to connect circuit normal use.
Can be preferably as concrete scheme of the present utility model：Mercury is also in series with the output end of the rectifier bridge to incline
Tiltedly switch.
By above-mentioned setting, mercury tilt switch is when tilting, the connection of open-circuit line, so as to ensure circuit
In the stable environment of work.
In summary, the utility model has the advantages that：With detection line road overcurrent condition and excessively stream guarantor can be carried out
Shield, circuit connection can be recovered automatically after overcurrent condition removal, it is stable and reliable in work.
Brief description of the drawings
Fig. 1 is the circuit structure block diagram of the present embodiment 1；
Fig. 2 is the signal sample circuit of the present embodiment 1 and the connection figure of signal amplification circuit；
Fig. 3 is the signal comparator circuit of the present embodiment 1 and the connection figure of on-off circuit；
Fig. 4 is the circuit structure block diagram of embodiment 2.
100, transformer in figure；200th, rectifier bridge；300th, signal sample circuit；400th, signal amplification circuit；410th, amplify
Device；500th, signal comparator circuit；510th, comparator；600th, on-off circuit；610th, indicator lamp；700th, mercury tilt switch.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment 1：A kind of current foldback circuit, including transformer 100, rectifier bridge 200, signal sample circuit 300, signal
Amplifying circuit 400, signal comparator circuit 500 and on-off circuit 600.A lines branch on the primary side of transformer 100 is
Signal sample circuit 300, signal amplification circuit 400, signal comparator circuit 500 and on-off circuit 600.The connection of rectifier bridge 200 becomes
The secondary side of depressor 100.
With reference to shown in Fig. 2, signal S1 is the sample rate current on the primary side of transformer 100, and signal sample circuit 300 is adopting
Collect the current signal output sampled signal of the primary side of transformer 100, signal amplification circuit 400 is receiving sampled signal and will adopt
Sample signal enhanced processing is exported.
Signal sample circuit 300 includes resistance R9, resistance R8 and electric capacity C4, and resistance R9 one end is as input and company
Connecting resistance R8 one end, resistance R9 other ends ground connection, resistance R8 other end connection electric capacity C4 one end are simultaneously used as output, electric capacity C4's
The other end is grounded.
Signal amplification circuit 400 includes amplifier 410, resistance R6, resistance R7 and electric capacity C3, the same phase of amplifier 410
End connection sample circuit output end, inverting input connection resistance R6 one end, electric capacity C3 one end and the resistance of amplifier 410
The output end of R7 one end, resistance R7 other ends ground connection, the electric capacity C3 other ends connection resistance R6 other ends and amplifier 410.Letter
Number S2 is the signal after amplifier 410 amplifies.
Electric current is decayed by resistance R9, and low current signal afterwards removes ripple interference by resistance R8 and electric capacity C4, most
The electric current of post-sampling is exported.After amplification of the electric current of sampling by amplifier 410, the strong of sample rate current can be expanded
Degree, while improve the stability of sampled signal.
With reference to shown in Fig. 3, signal comparator circuit 500 is to judge whether excessively stream and export judgement signal, on-off circuit 600
The break-make of the primary side circuit of transformer 100 is controlled according to signal is judged.
Signal comparator circuit 500 includes comparator 510, resistance R5, potentiometer Rp and electric capacity C2.Comparator 510 it is anti-
Phase input connects the output end of amplifier 410, in-phase input end connection electric capacity C2 one end of comparator 510 and the tune of potentiometer
Save end, resistance R5 one end connection 5V voltages, resistance R5 other ends connection potentiometer Rp one end, the potentiometer Rp other ends and electric capacity C2
The other end is grounded.
On-off circuit 600 include relay K1, triode Q1, electric capacity C1, resistance R1, resistance R2, resistance R3, resistance R4 with
And indicator lamp 610.The anode of indicator lamp 610 connects voltage, the negative electrode of indicator lamp 610 connection resistance R2 one end, and the resistance R2 other ends connect
Meet diode D1 negative electrodes, resistance R3 one end and the output end of signal comparator circuit 500, resistance R3 other ends connection resistance R4 mono-
End, resistance R4 other ends ground connection, diode D1 anodes connection resistance R1 one end, electric capacity C1 one end and triode Q1 basis sets, resistance
The R1 other ends connect voltage, electric capacity C1 other ends ground connection, triode Q1 collector connection relay K1, triode Q1 transmitting
Pole is grounded, and relay K1 other end connection voltage, relay K1 normally-closed contact K1-1 is connected to the primary side of transformer 100
On incoming line.
5V voltages or 12V voltages in other Fig. 2 and Fig. 3 can be that external power source provides, it is possibility to have battery provides.
Potentiometer Rp can set threshold value by adjusting itself resistance size, so as to actual current size whether excessively stream
Make comparative judgments.When overcurrent condition occurs, comparator 510 exports low level, and otherwise comparator 510 exports high level.Serve as
When flow phenomenon occurs, comparison circuit exports low level, and now indicator lamp 610 is lighted, and electric capacity C1 is carried out by diode D1
Electric discharge, so as to which triode Q1 basis set is in low level, triode Q1 conductings, so as to relay K1 energized actions, relay K1
Normally-closed contact K1-1 disconnect, cut off the input of power supply, played a part of overcurrent protection.When outside input electric current recovers normal
When, comparison circuit exports high level, and now indicator lamp 610 is not worked, and electric capacity C1 can not be discharged by diode D1, so as to electricity
Appearance C1 is in charged state and make it that triode Q1 basis set voltage is higher, and triode Q1 is in cut-off state, and relay K1 must not
Electricity, the normally-closed contact K1-1 of relay restPose, so as to connect circuit normal use.
In summary, signal sample circuit 300 has carried out current sample to this part circuit of power input, collects
Signal handled by signal amplification circuit 400, the order of accuarcy of signal acquisition can be effectively improved, sampled signal output
Small-signal easily by external interference, if be directly compared processing will produce larger error, this programme believes this
Number compare again after enhanced processing in advance, afterwards, the judgement signal reliability of output is higher, judges that signal inputs to on-off circuit
600, on-off circuit 600 realizes the action protection of the primary side circuit of transformer 100, and when over-current phenomenon avoidance disappears, on-off circuit 600 is again
The state to resile.
Embodiment 2：
On the basis of embodiment 1, as shown in figure 4, being also in series with mercury tilt switch in the output end of rectifier bridge 200
700.Mercury tilt switch 700 is when tilting, the connection of open-circuit line, so as to ensure the stable ring of circuit work
In border.
This specific embodiment is only that it is not to limitation of the present utility model, ability to explanation of the present utility model
Field technique personnel can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but
As long as all protected in right of the present utility model by Patent Law.
Claims (6)
1. a kind of current foldback circuit, including transformer (100), the rectifier bridge (200) for being connected to transformer (100) secondary side,
It is characterized in that：Also it is connected with signal sample circuit (300), signal amplification electricity on the primary side of the transformer (100) in turn
Road (400), signal comparator circuit (500) and on-off circuit (600)；
To gather the current signal of transformer (100) primary side output sampled signal, signal amplifies signal sample circuit (300)
Circuit (400) gives signal comparator circuit (500) to receive sampled signal and export sampled signal enhanced processing, and signal compares
Circuit (500) is to judge whether excessively stream and export judgement signal, and on-off circuit (600) is according to signal is judged to control transformer
(100) break-make of primary side circuit.
2. current foldback circuit according to claim 1, it is characterised in that：The signal sample circuit (300) includes electricity
Resistance R9, resistance R8 and electric capacity C4, resistance R9 one end as input and connect resistance R8 one end, another terminations of resistance R9
Ground, resistance R8 other end connection electric capacity C4 one end are simultaneously grounded as output, the electric capacity C4 other end.
3. current foldback circuit according to claim 2, it is characterised in that：The signal amplification circuit (400) includes putting
Big device (410), resistance R6, resistance R7 and electric capacity C3, the in-phase end connection sample circuit output end of amplifier (410), amplification
Inverting input connection resistance R6 one end, electric capacity C3 one end and resistance R7 one end of device (410), resistance R7 other ends ground connection,
The electric capacity C3 other ends connect the output end of the resistance R6 other ends and amplifier (410).
4. current foldback circuit according to claim 3, it is characterised in that：Signal comparator circuit (500) includes comparator
(510), resistance R5, potentiometer Rp and electric capacity C2, the output of the inverting input connection amplifier (410) of comparator (510)
End, in-phase input end connection electric capacity C2 one end of comparator (510) and the adjustable side of potentiometer, resistance R5 one end connection 5V electricity
Pressure, resistance R5 other ends connection potentiometer Rp one end, the potentiometer Rp other ends and electric capacity C2 other ends ground connection.
5. current foldback circuit according to claim 1, it is characterised in that：The on-off circuit (600) includes relay
K1, triode Q1, electric capacity C1, resistance R1, resistance R2, resistance R3, resistance R4 and indicator lamp (610), indicator lamp (610) anode
Connect voltage, indicator lamp (610) negative electrode connection resistance R2 one end, resistance R2 other ends connection diode D1 negative electrodes, resistance R3 mono-
End and signal comparator circuit (500) output end, resistance R3 other ends connection resistance R4 one end, resistance R4 other ends ground connection, two
Pole pipe D1 anodes connection resistance R1 one end, electric capacity C1 one end and triode Q1 basis sets, resistance R1 other ends connection voltage, electric capacity C1
The other end is grounded, triode Q1 collector connection relay K1, triode Q1 grounded emitter, the relay K1 other end
Voltage is connected, relay K1 normally-closed contact is connected on the incoming line of transformer (100) primary side.
6. current foldback circuit according to claim 1, it is characterised in that：In the output end of the rectifier bridge (200) also
It is in series with mercury tilt switch (700).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720973259.3U CN207218218U (en) | 2017-08-04 | 2017-08-04 | A kind of current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720973259.3U CN207218218U (en) | 2017-08-04 | 2017-08-04 | A kind of current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218218U true CN207218218U (en) | 2018-04-10 |
Family
ID=61817994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720973259.3U Expired - Fee Related CN207218218U (en) | 2017-08-04 | 2017-08-04 | A kind of current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207218218U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832590A (en) * | 2018-07-13 | 2018-11-16 | 浙江英洛华新能源科技有限公司 | overcurrent protection relay |
| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
| CN113985856A (en) * | 2021-11-16 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Temperature controller switching value detection device |
| CN117976467A (en) * | 2024-03-29 | 2024-05-03 | 苏州锦博元电器有限公司 | Relay capable of overcurrent protection and protection method thereof |
-
2017
- 2017-08-04 CN CN201720973259.3U patent/CN207218218U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832590A (en) * | 2018-07-13 | 2018-11-16 | 浙江英洛华新能源科技有限公司 | overcurrent protection relay |
| CN108832590B (en) * | 2018-07-13 | 2023-09-29 | 浙江英洛华新能源科技有限公司 | Overcurrent protection relay |
| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
| CN111352010B (en) * | 2020-04-23 | 2022-06-14 | 烟台海珐电气科技有限公司 | Switch board insulation fault early warning device |
| CN113985856A (en) * | 2021-11-16 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Temperature controller switching value detection device |
| CN117976467A (en) * | 2024-03-29 | 2024-05-03 | 苏州锦博元电器有限公司 | Relay capable of overcurrent protection and protection method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180410 |