CN203830881U - Fan overcurrent protection circuit - Google Patents
Fan overcurrent protection circuit Download PDFInfo
- Publication number
- CN203830881U CN203830881U CN201420182424.XU CN201420182424U CN203830881U CN 203830881 U CN203830881 U CN 203830881U CN 201420182424 U CN201420182424 U CN 201420182424U CN 203830881 U CN203830881 U CN 203830881U
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- CN
- China
- Prior art keywords
- blower fan
- triode
- control module
- fan
- module
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- Expired - Fee Related
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- 238000007664 blowing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The utility model discloses a fan overcurrent protection circuit which comprises a control signal input end, a control module, an execution module used for connecting or disconnecting a fan circuit and a feedback module used for acquiring a fan current signal. The control signal input end transmits a control signal to the control module, the control module is connected with the execution module, the control module makes a command that the execution module connects or disconnects the fan circuit, the execution module connects or disconnects the fan according to a connection or disconnection command, and the feedback module is used for detecting the fan current signal and feeding the fan current signal back to the control module. When the acquired fan current is larger than the preset fan current, the control module makes a fan circuit disconnection command. The fan overcurrent protection circuit can control a fan to work and can stop the fan when the fan current exceeds the preset current to achieve an overcurrent protection effect and prevent the fan current from being too large and causing the problem that an inverter welding machine loses control or explodes, the service life of the inverter welding machine is prolonged, and the requirement of the inverter welding machine for high quality is met.
Description
Technical field
The utility model relates to inverter type welder technical field, especially relates to a kind of blower fan current foldback circuit.
Background technology
Increasingly mature along with inverter type welder technology, inverter type welder volume is more and more less, weight is more and more lighter and more and more energy-conservation, so range of application is also more and more wider.Meanwhile, people have higher requirement to inverter type welder quality.
In order to meet the high-power electric current output of inverter type welder, often need on inverter type welder, install blower fan additional and come inverter type welder wind-cooling heat dissipating, the inverter type welder that heat dispersion is strong has proposed high request to the reliability of blower fan work, and therefore blower fan enjoys insider to pay close attention to.Wherein, as shown in Figure 1, during inverter type welder work, control signal input is controlled triode Q to conventional fan starting circuit
1at control signal input input high level, can make triode conducting; DC fan work; but often can there is unusual condition in blower fan; blower fan internal short-circuit phenomenon for example; during blower fan short circuit, can drag down VCC supply voltage, will cause inverter type welder control section to lose efficacy, inverter type welder aircraft bombing accident can occur when situation is serious.
Summary of the invention
Based on this, the utility model is to overcome the defect of prior art, and a kind of blower fan current foldback circuit is provided, and avoids in blower fan the excessive out of control or aircraft bombing phenomenon of inverter type welder that causes of electric current, extends inverter type welder service life.
Its technical scheme is as follows: a kind of blower fan current foldback circuit, comprise control signal input, control module, for Executive Module that blower fan circuit is switched on or switched off and for obtaining the feedback module of blower fan current signal, described control signal input is delivered to control module by control signal, control module is connected with described Executive Module, described control module is made Executive Module according to described control signal blower fan circuit is switched on or switched off to order, described in described Executive Module basis, being switched on or switched off order is switched on or switched off blower fan, feedback module is for detection of blower fan current signal and fed back to described control module, when the blower fan electric current getting is greater than default blower fan electric current, described control module is made blowing machine circuit ON-and OFF-command.
Below further technical scheme is described:
Preferably, described Executive Module comprises the first triode, and the base stage of described the first triode is connected with control module, and the emitter stage of the colelctor electrode of described the first triode, the first triode is connected in blower fan circuit.
Preferably, described control module comprises the second triode, the base stage of described the second triode is connected with described control signal input by the first resistance, described control signal input is also connected to power supply by the second resistance, the emitter stage of described the second triode is connected to described power supply by the 3rd resistance, and the colelctor electrode of described the second triode is connected with the base stage of described the first triode.
Preferably, described control module comprises the first comparator, one of them input of the first comparator is connected with control signal input, another input of described the first comparator is connected with the output of the first comparator, and the output of the first comparator is connected with the base stage of described the first triode by the 4th resistance.
Preferably, described feedback module comprises the second comparator, one of them input of described the second comparator is connected to default high potential, another input of described the second comparator is connected in blower fan circuit, and the output of described the second comparator is connected to described control module by the 5th resistance, the first diode.
Preferably, described feedback module comprises the 3rd triode, and the base stage of described the 3rd triode is connected in blower fan circuit, the grounded emitter of described the 3rd triode, the colelctor electrode of described the 3rd triode is connected with described control module, and the base stage of described the first triode is by the 6th resistance eutral grounding.
Preferably, between the emitter stage of described the 3rd triode and the base stage of the 3rd triode or between described control signal input, be provided with electric capacity.
Preferably, also comprise the second diode, the negative electrode of described the second diode is connected with the positive pole of blower fan, and the anode of described the second diode is connected with the negative pole of blower fan.
Below the principle of aforementioned techniques scheme, effect etc. are described:
By adopting after blower fan current foldback circuit described in the utility model; when needs are opened blower fan; can be at control signal input input control signal; control module detects this control signal; and make Executive Module and connect blower fan circuits command; Executive Module is about to blower fan circuit and connects, and blower fan is started working; If feedback module detects blower fan circuital current, surpass while presetting blower fan electric current, feedback module is about to this signal feedback to control module, and control module is made Executive Module and disconnected blower fan circuits command, and Executive Module is about to blower fan circuit and disconnects, and blower fan quits work.Blower fan current foldback circuit described in the utility model can be controlled blower fan work; simultaneously can be when blower fan circuital current surpasses scheduled current; disconnect blower fan circuit; stop blower fan; play overcurrent protection; can avoid the excessive out of control or aircraft bombing phenomenon of inverter type welder that causes of blower fan electric current, can greatly extend inverter type welder service life, meet the requirement of inverter type welder high-quality.
Accompanying drawing explanation
Fig. 1 is the start-up circuit of blower fan in prior art;
Fig. 2 is blower fan current foldback circuit control structure figure described in the utility model embodiment;
Fig. 3 is blower fan current foldback circuit figure described in the utility model embodiment mono-;
Fig. 4 is blower fan current foldback circuit figure described in the utility model embodiment bis-;
Fig. 5 is blower fan current foldback circuit figure described in the utility model embodiment tri-;
Fig. 6 is blower fan current foldback circuit figure described in the utility model embodiment tetra-.
Description of reference numerals:
10, blower fan, 20, Executive Module, 30, control signal input, 40, control module, 50, feedback module.
The specific embodiment
Below embodiment of the present utility model is elaborated:
As shown in Figure 2, it is blower fan current foldback circuit control structure figure described in the utility model embodiment.Blower fan current foldback circuit described in the utility model, comprise control signal input 30, control module 40, for Executive Module 20 that blower fan circuit is switched on or switched off and for obtaining the feedback module 50 of blower fan current signal, described control signal input 30 is delivered to control module 40 by control signal, control module 40 is connected with described Executive Module 20, described control module 40 is made Executive Module 20 according to described control signal blower fan circuit is switched on or switched off to order, described in described Executive Module 20 bases, being switched on or switched off order is switched on or switched off blower fan, feedback module 50 is for detection of blower fan current signal and fed back to described control module 40, when the blower fan electric current getting is greater than default blower fan electric current, described control module 40 is made blowing machine circuit ON-and OFF-command.
By adopting after blower fan current foldback circuit described in the utility model; when needs are opened blower fan; can be at control signal input 30 input control signals; control module 40 detects this control signal; and make Executive Module 20 and connect blower fan circuits command; Executive Module 20 is about to blower fan circuit and connects, and blower fan 10 is started working; If detecting blower fan circuital current, feedback module 50 surpasses while presetting blower fan electric current, feedback module 50 is about to this signal feedback to control module 40, control module 40 is made Executive Module 20 and is disconnected blower fan circuits command, and Executive Module 20 is about to blower fan circuit and disconnects, and blower fan 10 quits work.Blower fan current foldback circuit described in the utility model can be controlled blower fan work; simultaneously can be when blower fan circuital current surpasses scheduled current; disconnect blower fan circuit; stop blower fan; play overcurrent protection; can avoid the excessive out of control or aircraft bombing phenomenon of inverter type welder that causes of blower fan electric current, can greatly extend inverter type welder service life, meet the requirement of inverter type welder high-quality.
As shown in Fig. 3-6, it is the blower fan current foldback circuit figure of four embodiment described in the utility model.Wherein, described Executive Module 20 comprises the first triode Q
1, described the first triode Q
1base stage be connected with control module 40, described the first triode Q
1colelctor electrode, the first triode Q
1emitter stage be connected in blower fan circuit, concrete, the positive pole of blower fan 10 can be connected to power supply VCC, by the negative pole of blower fan 10 and described the first triode Q
1colelctor electrode be connected, by the first triode Q
1emitter stage connect the 7th resistance R
7rear ground connection.The first triode Q in the utility model embodiment
1adopt NPN type, as the first triode Q
1base stage conducting while being high potential, as the first triode Q
1base stage end while being low level, can be by controlling the first triode Q
1cut-off or conducting realize that blower fan circuit disconnects or connect.
As shown in Figure 6, in an embodiment, described control module 40 comprises the first comparator U therein
1, the first comparator U
1in-phase input end be connected with control signal input 30, described the first comparator U
1inverting input and the first comparator U
1output be connected, the first comparator U
1output by the 4th resistance R
4with described the first triode Q
1base stage connect.In an embodiment, described feedback module 50 comprises the second comparator U therein
2, described the second comparator U
2in-phase input end be connected to default high potential Verf, described the second comparator U
2reverse input end be connected in blower fan circuit, concrete, the positive pole of blower fan 10 can be connected to power supply VCC, by the negative pole of blower fan 10 and described the first triode Q
1colelctor electrode be connected, by the first triode Q
1emitter stage connect the 7th resistance R
7rear ground connection, meanwhile, by the second comparator U
2reverse input end and the first triode Q
1emitter stage connect, described the second comparator U
2output by the 5th resistance R
5, the first diode D
1be connected to described control module 40.In the time of need to starting blower fan, at control signal input 30 input high levels, through the first comparator U
1can be by the first triode Q after output
1conducting, blower fan circuit is connected, wherein in force, can be at the first comparator U
1with the first triode Q
1between the resistance of connecting.When blower fan electric current increases, the second comparator U
2the potential rise at reverse input end place, when higher than default high potential Verf, the second comparator U
2output output low level, through the 5th resistance R
5, the first diode D
1reduce the first comparator U
1the voltage of output so that a triode Q
1turn-off, blower fan quits work, and plays overcurrent protection.
As in Figure 3-5, in an embodiment, described control module 40 comprises the second triode Q therein
2, described the second triode Q
2base stage by the first resistance R
1be connected with described control signal input 30, described control signal input 30 is also by the second resistance R
2be connected to power supply VCC, described the second triode Q
2emitter stage by the 3rd resistance R
3be connected to described power supply VCC, described the second triode Q
2colelctor electrode and described the first triode Q
1base stage be connected.In an embodiment, described feedback module 50 comprises the 3rd triode Q therein
3, described the 3rd triode Q
3base stage be connected in blower fan circuit, described the 3rd triode Q
3grounded emitter, described the 3rd triode Q
3colelctor electrode be connected with described control module 40, described the first triode Q
1base stage by the 6th resistance R
6ground connection.When welding machine start work, air-blower control signal input part 30 is low level, the second triode Q
2will conducting, the second triode Q
2after conducting, the first triode Q
1the voltage at base stage place set high, the first triode Q
1also conducting thereupon, the first triode Q
1colelctor electrode in low level, blower fan work.If blower fan electric current is greater than the electric current of the normal work of blower fan, the first triode Q
1the voltage at emitter stage place will be higher than the 3rd triode Q
3conduction value make the 3rd triode Q
3conducting, the 3rd triode Q
3after conducting, the first triode Q
1base stage place voltage set low, the first triode Q
1be operated in cut-off state, blower fan quits work, to protect blower fan.
As shown in Figure 4,5, therein in an embodiment, described the 3rd triode Q
3emitter stage and the 3rd triode Q
3base stage between or between described control signal input 30, be provided with electric capacity, concrete, can be at described the 3rd triode Q
3emitter stage and the 3rd triode Q
3base stage between the first capacitor C is set
1, at the 3rd triode Q
3emitter stage and described control signal input 30 between be provided with the second capacitor C
2, can eliminate the interference that alternating current produces.
As shown in Figure 5, therein in an embodiment, blower fan current foldback circuit also comprises the second diode D described in the utility model embodiment
2, described the second diode D
2negative electrode be connected with the positive pole of blower fan 10, described the second diode D
2anode be connected with the negative pole of blower fan 10, applicant finds the positive and negative electrode of blower fan to connect a diode, the damage phenomenon that can avoid blower fan starting larger reversing the current that moment produces blower fan is produced.
The blower fan current foldback circuit that the utility model embodiment mono-to four takes can be when electric current surpasses scheduled current; disconnect blower fan circuit; stop blower fan; to play overcurrent protection; avoid the excessive out of control or aircraft bombing phenomenon of inverter type welder that causes of blower fan electric current; greatly extend inverter type welder service life, from above-mentioned four embodiment, be not difficult to draw, its overcurrent protection thinking includes following two steps:
Step 1 is provided for the Executive Module that blower fan circuit is disconnected or connected in blower fan circuit;
Step 2, the blower fan current signal of judgement blower fan circuit, when blower fan electric current surpasses default blower fan electric current, notifies described Executive Module that blower fan circuit is disconnected.This step 2 is specifically: will between blower fan negative pole and ground, access resistance, obtain described resistance current potential and with preset potential comparison, when the current potential of described resistance is during higher than preset potential, blower fan circuit is disconnected.
The above embodiment has only expressed the specific embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (8)
1. a blower fan current foldback circuit, it is characterized in that, comprise control signal input, control module, for Executive Module that blower fan circuit is switched on or switched off and for obtaining the feedback module of blower fan current signal, described control signal input is delivered to control module by control signal, control module is connected with described Executive Module, described control module is made Executive Module according to described control signal blower fan circuit is switched on or switched off to order, described in described Executive Module basis, being switched on or switched off order is switched on or switched off blower fan, feedback module is for detection of blower fan current signal and fed back to described control module, when the blower fan electric current getting is greater than default blower fan electric current, described control module is made blowing machine circuit ON-and OFF-command.
2. blower fan current foldback circuit according to claim 1; it is characterized in that; described Executive Module comprises the first triode, and the base stage of described the first triode is connected with control module, and the emitter stage of the colelctor electrode of described the first triode, the first triode is connected in blower fan circuit.
3. blower fan current foldback circuit according to claim 2; it is characterized in that; described control module comprises the second triode; the base stage of described the second triode is connected with described control signal input by the first resistance; described control signal input is also connected to power supply by the second resistance; the emitter stage of described the second triode is connected to described power supply by the 3rd resistance, and the colelctor electrode of described the second triode is connected with the base stage of described the first triode.
4. blower fan current foldback circuit according to claim 2; it is characterized in that; described control module comprises the first comparator; one of them input of the first comparator is connected with control signal input; another input of described the first comparator is connected with the output of the first comparator, and the output of the first comparator is connected with the base stage of described the first triode by the 4th resistance.
5. according to the blower fan current foldback circuit described in claim 3 or 4; it is characterized in that; described feedback module comprises the second comparator; one of them input of described the second comparator is connected to default high potential; another input of described the second comparator is connected in blower fan circuit, and the output of described the second comparator is connected to described control module by the 5th resistance, the first diode.
6. according to the blower fan current foldback circuit described in claim 3 or 4; it is characterized in that; described feedback module comprises the 3rd triode; the base stage of described the 3rd triode is connected in blower fan circuit; the grounded emitter of described the 3rd triode; the colelctor electrode of described the 3rd triode is connected with described control module, and the base stage of described the first triode is by the 6th resistance eutral grounding.
7. blower fan current foldback circuit according to claim 6, is characterized in that, between the emitter stage of described the 3rd triode and the base stage of the 3rd triode or between described control signal input, is provided with electric capacity.
8. blower fan current foldback circuit according to claim 6, is characterized in that, also comprises the second diode, and the negative electrode of described the second diode is connected with the positive pole of blower fan, and the anode of described the second diode is connected with the negative pole of blower fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420182424.XU CN203830881U (en) | 2014-04-15 | 2014-04-15 | Fan overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420182424.XU CN203830881U (en) | 2014-04-15 | 2014-04-15 | Fan overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203830881U true CN203830881U (en) | 2014-09-17 |
Family
ID=51508770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420182424.XU Expired - Fee Related CN203830881U (en) | 2014-04-15 | 2014-04-15 | Fan overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203830881U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927570A (en) * | 2016-04-19 | 2016-09-07 | 成都瑞阳机械有限公司 | Power supply protection type intelligent cooling control system with centrifugal fan |
| CN108644144A (en) * | 2018-04-04 | 2018-10-12 | 重庆金山医疗器械有限公司 | A kind of DC fan failure monitoring system |
| CN114079260A (en) * | 2020-08-17 | 2022-02-22 | 浙江海利普电子科技有限公司 | Fan protection circuit |
-
2014
- 2014-04-15 CN CN201420182424.XU patent/CN203830881U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927570A (en) * | 2016-04-19 | 2016-09-07 | 成都瑞阳机械有限公司 | Power supply protection type intelligent cooling control system with centrifugal fan |
| CN108644144A (en) * | 2018-04-04 | 2018-10-12 | 重庆金山医疗器械有限公司 | A kind of DC fan failure monitoring system |
| CN114079260A (en) * | 2020-08-17 | 2022-02-22 | 浙江海利普电子科技有限公司 | Fan protection circuit |
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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: 20140917 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |