CN107749611A - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
- Publication number
- CN107749611A CN107749611A CN201711136031.XA CN201711136031A CN107749611A CN 107749611 A CN107749611 A CN 107749611A CN 201711136031 A CN201711136031 A CN 201711136031A CN 107749611 A CN107749611 A CN 107749611A
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- China
- Prior art keywords
- resistance
- output end
- power supply
- resistor
- voltage
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- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of overvoltage crowbar, it is connected between power supply and load, the positive pole of the power supply respectively with first resistor input, second resistance input connects with the input of the load, the output end of the first resistor is connected with the input of 3rd resistor and the base stage of triode respectively, the emitter stage of the output end of the 3rd resistor and the triode is all connected with the negative pole of the power supply, the output end of the second resistance connects the colelctor electrode of the triode respectively, the negative pole of voltage-stabiliser tube and the 4th resistance input, the positive pole of the voltage-stabiliser tube connects the power cathode, the output end of 4th resistance is connected by switching tube with the output end of the power supply.Foregoing circuit can reach the effect of voltage comparator without using voltage comparator, and so as to reduce this circuit of individually being powered to voltage comparator, circuit is simplified, not only reduces electric cost, while also reduces the cost of manufacture.
Description
Technical field
The present invention relates to circuit protection technical field, more particularly to a kind of overvoltage crowbar.
Background technology
Electrical appliance has become article essential in people's life at present, and it make it that the life of people is more convenient,
Need electrical appliance and power supply being attached during electrical appliance is used, effective electricity is provided for electrical appliance by power supply
Can so that electrical appliance normal operation work, but in actual use because the voltage at power supply, electric current etc. can become
Change, so that electrical appliance can not reach optimal working condition, the electric current or voltage at power supply can be right when undergoing mutation
Electrical appliance causes to damage, or even can also trigger fire.
In order to ensure that the normal safe handling of electrical appliance needs to set overvoltage circuit, specific works between power supply and load
Process is：It is by electric resistance partial pressure sample circuit, the positive input terminal of obtained magnitude of voltage input voltage comparator, reference voltage is defeated
Enter to voltage comparator negative input end, voltage comparator compares both voltage swings and exports different voltages, and then control metal-oxide-semiconductor is
No conducting, and then whether control circuit enters overvoltage protection state.
Although above-mentioned overvoltage crowbar can carry out effectively protecting the safe to use of electrical appliance, voltage comparator
Need individually to power, its voltage value and circuit input voltage value difference are larger, it is necessary to which more complicated reduction voltage circuit, not only increases
The cost of electricity consumption, while the manufacture also improved and the cost used.
Therefore it provides a kind of overvoltage crowbar, to simple in construction, reduction manufacturing cost, while without individually power,
Electric cost is reduced, just turns into those skilled in the art's urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of overvoltage crowbar, to simple in construction, manufacturing cost is reduced, while need not
Individually power supply, reduce electric cost.
To achieve these goals, the present invention provides a kind of overvoltage crowbar, is connected between power supply and load, described
Input of the positive pole of power supply respectively with first resistor input, second resistance input and the load is connected, and described first
The output end of resistance is connected with the input of 3rd resistor and the base stage of triode respectively, the output end of the 3rd resistor and institute
The emitter stage for stating triode is all connected with the negative pole of the power supply, and the output end of the second resistance connects the triode respectively
Colelctor electrode, the negative pole of voltage-stabiliser tube and the 4th resistance input, the positive pole connection power cathode of the voltage-stabiliser tube, the described 4th
The output end of resistance is connected by switching tube with the output end of the power supply.
Preferably, the switching tube is the enhanced FET of insulated gate N-channel；
The grid of the FET is control terminal, is connected with the output end of the 4th resistance；
The drain electrode of the FET is input, is connected with the output end of the load；
The source electrode of the FET is output end, is connected with the negative pole of the power supply.
Preferably, the first electric capacity is parallel between the positive pole and negative pole of the power supply, so that user filters.
Preferably, the second electric capacity is connected between the negative pole of the output end of the first resistor and the power supply, for use in
Filtering.
Preferably, be connected with the 3rd electric capacity between the output end of the 4th resistance and the negative pole of the power supply, so as to
In filtering.
Preferably, the first resistor, the second resistance, the 3rd resistor and the 4th resistance are definite value electricity
Resistance.
Preferably, first electric capacity, second electric capacity and the 3rd electric capacity are nonpolarity fixed capacity.
Overvoltage crowbar provided by the present invention, be connected between power supply and load, the positive pole of the power supply respectively with
First resistor input, second resistance input connect with the input of the load, the output end difference of the first resistor
It is connected with the input of 3rd resistor and the base stage of triode, the emitter stage of the output end of the 3rd resistor and the triode
It is all connected with the negative pole of the power supply, the output end of the second resistance connects the colelctor electrode of the triode, voltage-stabiliser tube respectively
Negative pole and the 4th resistance input, the positive pole of the voltage-stabiliser tube connect the power cathode, and the output end of the 4th resistance is led to
The output end that switching tube is crossed with the power supply is connected.The operation principle of foregoing circuit is：Pass through first resistor and 3rd resistor point
Sample circuit is pressed, so as to control transistor base voltage, when transistor base voltage is not up to certain value, triode cut-off,
Now there is electric current to flow through in second resistance, voltage-stabiliser tube, voltage stabilizing tube cathode output burning voltage carrys out the conducting of controlling switch pipe；When three
When pole pipe base voltage reaches certain value, triode ON, voltage stabilizing tube cathode, which is equivalent to, is connected on power cathode, now in voltage-stabiliser tube
There is no electric current to flow through, switching tube no-voltage, switching tube cut-off.
Foregoing circuit can reach the effect of voltage comparator without using voltage comparator, so as to reduce to voltage ratio
Individually powered compared with device this circuit, circuit is simplified, not only reduces electric cost, while also reduces the cost of manufacture.
Brief description of the drawings
Fig. 1 is a kind of structural representation of embodiment of overvoltage crowbar provided by the present invention.
Description of reference numerals：
1 is power supply；2 be the first electric capacity；3 be first resistor, and 4 be second resistance, and 5 be load, and 6 be switching tube.7 be the 4th
Resistance, 8 be the 3rd electric capacity, and 9 be voltage-stabiliser tube, and 10 be triode, and 11 be 3rd resistor, and 12 be the second electric capacity.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Fig. 1 is refer to, Fig. 1 is a kind of structural representation of embodiment of overvoltage crowbar provided by the present invention.
In a kind of embodiment, overvoltage crowbar provided by the present invention, be connected to power supply 1 and load 5 it
Between, the input of the positive pole of the power supply 1 respectively with the input of first resistor 3, the input of second resistance 4 and the load 5 connects
Connecing, the output end of the first resistor 3 is connected with the input of 3rd resistor 11 and the base stage of triode 10 respectively, and the described 3rd
The emitter stage of the output end of resistance 11 and the triode 10 is all connected with the negative pole of the power supply 1, the output of the second resistance 4
End connects the colelctor electrode of the triode 10, the negative pole of voltage-stabiliser tube 9 and the input of the 4th resistance 7 respectively, and the voltage-stabiliser tube 9 is just
Pole connects the negative pole of power supply 1, and the output end of the 4th resistance 7 is connected by switching tube 6 with the output end of the power supply 1.
The operation principle of foregoing circuit is：By first resistor 3 and the pressure sampling circuit of 3rd resistor 11, so as to control the base of triode 10
Pole tension, when the base voltage of triode 10 is not up to certain value, triode 10 ends, now in second resistance 4, voltage-stabiliser tube 9
There is electric current to flow through, the negative electrode of voltage-stabiliser tube 9 output burning voltage carrys out the conducting of controlling switch pipe 6；When the base voltage of triode 10 reaches
During certain value, triode 10 turns on, and the negative electrode of voltage-stabiliser tube 9, which is equivalent to, is connected on the negative pole of power supply 1, does not now have electric current stream in voltage-stabiliser tube 9
Cross, the no-voltage of switching tube 6, switching tube 6 ends.
Foregoing circuit can reach the effect of voltage comparator without using voltage comparator, so as to reduce to voltage ratio
Individually powered compared with device this circuit, circuit is simplified, not only reduces electric cost, while also reduces the cost of manufacture.
It is pointed out that foregoing circuit make use of the voltage between the control base stage of triode 10 and emitter stage, control three
Pole pipe 10 is on or turn-off characteristic；Voltage-stabiliser tube 9 can export burning voltage when flowing through certain electric current.By controlling triode
10 base voltages control whether triode 10 turns on, and then control voltage-stabiliser tube 9 output voltage, the voltage of controlling switch pipe 6, control
Whether switching tube 6 processed turns on, and then whether control circuit enters overvoltage protection state, and solve needs list using voltage comparator
Only powerup issue.
It is further understood that, the switching tube 6 is the enhanced FET of insulated gate N-channel；The field-effect
The grid of pipe is control terminal, is connected with the output end of the 4th resistance 7；The drain electrode of the FET is input, with institute
State the output end connection of load 5；The source electrode of the FET is output end, is connected with the negative pole of the power supply 1.Above-mentioned field effect
Should pipe work when, the negative electrode output burning voltage of voltage-stabiliser tube 9 controls the grid voltage of FET, FET conducting；When
When the base voltage of triode 10 reaches certain value, triode 10 turns on, and the negative electrode of voltage-stabiliser tube 9, which is equivalent to, is connected on the negative pole of power supply 1, now
There is no electric current to flow through in voltage-stabiliser tube 9, fet gate no-voltage, FET cut-off, so as to realize the control to circuit.
Above-mentioned switching tube 6 is the enhanced FET of insulated gate N-channel, by the way that grid, drain electrode and source electrode are accessed
The different incoming ends of circuit make it that so as to realize the control to circuit its advantage is：With input resistance it is high (100M Ω~
1000M Ω), noise is small, low in energy consumption, dynamic range is big, is easily integrated, without secondary-breakdown phenomenon, safety operation area field width, heat
The advantages that stability is good.
Further, the first electric capacity 2 is parallel between the positive pole and negative pole of the power supply 1, so that user filters.By
The first electric capacity 2 is used in circuit so that the alternating component in circuit is filtered out, and the direct current of output is smoother, so as to ensure circuit
Positive production safe handling, while can effectively simplify the structure of circuit so that circuit carries out miniaturization production, reduce production into
This, and then reduce the use cost of user.
Further, the second electric capacity 12 is connected between the output end of the first resistor 3 and the negative pole of the power supply 1, with
Just it is used to filter.By using the second electric capacity 12 in circuit so that the alternating component in circuit is filtered out, and the direct current of output is more
Smoothly, so as to ensure that the positive production of circuit is used safely, while the structure of circuit can effectively be simplified so that circuit is minimized
Production, the cost of production is reduced, and then reduce the use cost of user.
Further, the 3rd electric capacity 8 is connected between the output end of the 4th resistance 7 and the negative pole of the power supply 1, with
Just it is used to filter.By using the 3rd electric capacity 8 in circuit so that the alternating component in circuit is filtered out, and the direct current of output is more
Smoothly, so as to ensure that the positive production of circuit is used safely, while the structure of circuit can effectively be simplified so that circuit is minimized
Production, the cost of production is reduced, and then reduce the use cost of user.
Specifically understand, the first resistor 3, the second resistance 4, the 3rd resistor 11 and the 4th resistance
7 be fixed value resistance.Overload protection is carried out to fixed magnitude of voltage above by that can be realized using fixed value resistance, so as to
Its versatility used is effectively improved, meets the use demand of user, while can realize and be standardized production, reduces production
Cost.
It is to be appreciated that above-mentioned first resistor 3, second resistance 4, the resistance 7 of 3rd resistor 11 and the 4th can also be to become
It is worth resistance, the resistance by adjusting each resistance can be realized carries out overvoltage protection to multiple voltage circuit so that more has
Flexibility, realize user and once choose the convenience that a variety of occasions use, while can effectively reduce the more occasions of user and use
Cost.
Specifically, first electric capacity 2, second electric capacity 12 and the 3rd electric capacity 8 are nonpolarity fixed capacity.
Above three electric capacity is nonpolarity fixed capacity, and the cost of the electric capacity of this kind of structure is low, enables to the manufacturing cost of circuit
Effectively reduce, while nonpolarity installation can effectively improve the efficiency of installation, reduce the cost of manufacture.
The various embodiments described above are only the preferred embodiment of the present invention, in the art, every to be based on skill of the present invention
Changes and improvements in art scheme, it should not exclude outside protection scope of the present invention.
Claims (7)
1. a kind of overvoltage crowbar, it is connected between power supply (1) and load (5), it is characterised in that the power supply (1) is just
Input of the pole respectively with first resistor (3) input, second resistance (4) input and the load (5) is connected, and described first
The output end of resistance (3) is connected with the input of 3rd resistor (11) and the base stage of triode (10) respectively, the 3rd resistor
(11) output end and the emitter stage of the triode (10) is all connected with the negative pole of the power supply (1), the second resistance (4)
Output end connects the colelctor electrode of the triode (10), the negative pole of voltage-stabiliser tube (9) and the 4th resistance (7) input respectively, described
The positive pole of voltage-stabiliser tube (9) connects power supply (1) negative pole, the output end of the 4th resistance (7) by switching tube (6) with it is described
The output end connection of power supply (1).
2. overvoltage crowbar according to claim 1, it is characterised in that the switching tube (6) is insulated gate N-channel
Enhanced FET；
The grid of the FET is control terminal, is connected with the output end of the 4th resistance (7)；The leakage of the FET
Extremely input, it is connected with the output end of the load (5)；
The source electrode of the FET is output end, is connected with the negative pole of the power supply (1).
3. overvoltage crowbar according to claim 2, it is characterised in that between the positive pole and negative pole of the power supply (1)
The first electric capacity (2) is parallel with, so that user filters.
4. overvoltage crowbar according to claim 3, it is characterised in that the output end of the first resistor (3) and institute
State and connect the second electric capacity (12) between the negative pole of power supply (1), for use in filtering.
5. overvoltage crowbar according to claim 4, it is characterised in that the output end of the 4th resistance (7) and institute
State and be connected with the 3rd electric capacity (8) between the negative pole of power supply (1), for use in filtering.
6. overvoltage crowbar according to claim 5, it is characterised in that the first resistor (3), the second resistance
(4), the 3rd resistor (11) and the 4th resistance (7) are fixed value resistance.
7. overvoltage crowbar according to claim 6, it is characterised in that first electric capacity (2), second electric capacity
(12) and the 3rd electric capacity (8) is nonpolarity fixed capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711136031.XA CN107749611A (en) | 2017-11-16 | 2017-11-16 | A kind of overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711136031.XA CN107749611A (en) | 2017-11-16 | 2017-11-16 | A kind of overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107749611A true CN107749611A (en) | 2018-03-02 |
Family
ID=61251355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711136031.XA Pending CN107749611A (en) | 2017-11-16 | 2017-11-16 | A kind of overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107749611A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN109557455A (en) * | 2018-12-12 | 2019-04-02 | 成都世纪光合作用科技有限公司 | A kind of product testing system |
| CN110416973A (en) * | 2019-07-25 | 2019-11-05 | 珠海格力电器股份有限公司 | Motor overvoltages protect circuit, under-voltage protecting circuit, voltage protection circuit and motor |
| CN114421737A (en) * | 2021-12-22 | 2022-04-29 | 无锡加视诚智能科技有限公司 | Power supply protection system for monitoring equipment |
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|---|---|---|---|---|
| US8254068B2 (en) * | 2010-03-25 | 2012-08-28 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Regulating system having overvoltage protection circuit and current protection circuit |
| CN202455057U (en) * | 2012-02-01 | 2012-09-26 | 深圳市同洲电子股份有限公司 | Power supply protecting circuit |
| CN203339652U (en) * | 2013-07-08 | 2013-12-11 | 天彩电子（深圳）有限公司 | Interface protection circuit |
| CN204205549U (en) * | 2014-09-02 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | Overvoltage protection |
| CN204290268U (en) * | 2014-11-20 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of protective circuit |
| CN206283237U (en) * | 2016-12-13 | 2017-06-27 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
-
2017
- 2017-11-16 CN CN201711136031.XA patent/CN107749611A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8254068B2 (en) * | 2010-03-25 | 2012-08-28 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Regulating system having overvoltage protection circuit and current protection circuit |
| CN202455057U (en) * | 2012-02-01 | 2012-09-26 | 深圳市同洲电子股份有限公司 | Power supply protecting circuit |
| CN203339652U (en) * | 2013-07-08 | 2013-12-11 | 天彩电子（深圳）有限公司 | Interface protection circuit |
| CN204205549U (en) * | 2014-09-02 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | Overvoltage protection |
| CN204290268U (en) * | 2014-11-20 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of protective circuit |
| CN206283237U (en) * | 2016-12-13 | 2017-06-27 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN109557455A (en) * | 2018-12-12 | 2019-04-02 | 成都世纪光合作用科技有限公司 | A kind of product testing system |
| CN110416973A (en) * | 2019-07-25 | 2019-11-05 | 珠海格力电器股份有限公司 | Motor overvoltages protect circuit, under-voltage protecting circuit, voltage protection circuit and motor |
| CN114421737A (en) * | 2021-12-22 | 2022-04-29 | 无锡加视诚智能科技有限公司 | Power supply protection system for monitoring equipment |
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| PB01 | Publication | ||
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Application publication date: 20180302 |