CN106786462B - A kind of amplifier switching mode overvoltage crowbar - Google Patents
A kind of amplifier switching mode overvoltage crowbar Download PDFInfo
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- CN106786462B CN106786462B CN201611254632.6A CN201611254632A CN106786462B CN 106786462 B CN106786462 B CN 106786462B CN 201611254632 A CN201611254632 A CN 201611254632A CN 106786462 B CN106786462 B CN 106786462B
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- operational amplifier
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- 230000005669 field effect Effects 0.000 claims abstract description 83
- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 9
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Semiconductor Integrated Circuits (AREA)
Abstract
The present invention relates to circuit design fields; more particularly to a kind of amplifier switching mode overvoltage crowbar, including operational amplifier, first diode, the second diode, third diode, the 4th diode, the 5th diode, the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, first resistor, second resistance, 3rd resistor and the 4th resistance.The characteristic that amplifier switching mode overvoltage crowbar provided by the invention cannot be mutated using the voltage of the pressure stabilizing of Zener diode and reverse breakdown characteristics and capacitor; and whether the output control field-effect tube of operational amplifier is connected; A point is directly controlled into N1 grid voltage compared to traditional overvoltage crowbar; it is more difficult to be influenced by temperature and technique; the precision of overvoltage protection clamp voltage is improved, realizes overvoltage protection and the instantaneous overvoltage protection of high-precision clamper.Amplifier switching mode overvoltage crowbar structure provided by the invention is simple, high reliablity and precision are high, easy to promote and utilize.
Description
Technical field
The present invention relates to circuit design field more particularly to a kind of amplifier switching mode overvoltage crowbars.
Background technique
Currently, with the rapid development of semiconductor technology, the use of integrated circuit throughout every field, particularly with
Power supply control class switching circuit (such as: DC-DC circuit, minimize switching power circuit), be widely used in power electronics,
Military project, scientific research, industrial control equipment, communication apparatus, instrument and meter, switching equipment, access device, mobile communication, router communication, work
The fields such as industry control, automotive electronics, aerospace.Since use switching circuit establishment power-supply system is short with the design cycle, can
The features such as high, system upgrade is easy by property, switching circuit using more and more extensive.With semiconductor technology, encapsulation technology and
A large amount of uses of high-frequency soft switch, the power density of switching circuit is increasing, and transfer efficiency is higher and higher, using also increasingly
Simply, currently a popular to complete over-voltage detection using semiconductor circuit, with semiconductor electronic switch cutoff input circuit, reach protection
The purpose of late-class circuit.
Traditional overvoltage crowbar is as shown in Figure 1, the overvoltage crowbar includes zener diode D1, D2, D3, resistance
R1, R2, R3, R4, field-effect tube P1, N1, N2 and capacitor C1.Power supply power supply schematic diagram such as Fig. 2 institute of the overvoltage crowbar
Show, wherein OVP indicates that overvoltage crowbar, the voltage value of VDD rise with the rising of Vdc.Wherein diode D1, D2, D3
Play the role of clamp voltage, when breakdown voltage of the VDD equal to D1 and D2 adds the forward conduction voltage and field-effect tube of D3
When the threshold voltage of N1, then N1 pipe be connected, the drain electrode of N1 be lower level make P1 pipe be connected, the drain electrode of P1 pipe gets higher level and makes at this time
The conducting of N2 pipe, i.e. N1, N2, P1, which is simultaneously turned on, realizes that power supply to the bleed off of earth-current, makes VDD clamper, no longer with the rising of Vdc
And rise, to realize overvoltage protection.
Seen from the above description, the threshold voltage of the clamp voltage size of traditional overvoltage crowbar and field-effect tube N1
It is related, but the threshold voltage of field-effect tube N1 is affected by temperature and technique, keeps clamp voltage value precision lower.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of high-precision amplifier switching mode overvoltage crowbar.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of amplifier switching mode overvoltage crowbar, including operational amplifier, first diode, the second diode, third
Diode, the 4th diode, the 5th diode, the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th effect
Ying Guan, first resistor, second resistance, 3rd resistor and the 4th resistance；The operational amplifier includes positive input, reversed defeated
Enter end and output end；
The positive input of the operational amplifier is grounded by the 5th diode；The positive input of the operational amplifier
End passes sequentially through the 4th field-effect tube and the first field-effect tube connects power supply；The reverse input end of the operational amplifier and the second electricity
One end of resistance is electrically connected；One end of the second resistance passes sequentially through first resistor, the 4th diode, the 4th resistance, the three or two
Pole pipe, the second diode and first diode connect power supply；The other end of the second resistance is grounded；
The output end of the operational amplifier connects power supply by the second field-effect tube, the output end of the operational amplifier according to
It is secondary to pass through the second field-effect tube and 3rd resistor ground connection；
The power supply is grounded by third field-effect tube.
The beneficial effects of the present invention are:
Amplifier switching mode overvoltage crowbar provided by the invention utilizes the pressure stabilizing and reverse breakdown characteristics of Zener diode
And whether the output control field-effect tube of the characteristic and operational amplifier that cannot be mutated of the voltage of capacitor is connected, compared to tradition
Overvoltage crowbar directly by A point control N1 grid voltage, it is more difficult to be influenced by temperature and technique, improve over-voltage guarantor
The precision of clamp voltage is protected, realizes overvoltage protection and the instantaneous overvoltage protection of high-precision clamper.Amplifier switch provided by the invention
Type overvoltage crowbar structure is simple, high reliablity and precision are high, easy to promote and utilize.
Detailed description of the invention
Fig. 1 is overvoltage crowbar connection figure traditional in background technique of the invention；
Fig. 2 is the power supply power supply connection figure of overvoltage crowbar in the present invention and background technique of the invention；
Fig. 3 is the connection figure of amplifier switching mode overvoltage crowbar of the invention.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: utilizing the pressure stabilizing of Zener diode and reverse breakdown characteristics and the electricity of capacitor
It presses whether the output control field-effect tube of the characteristic and operational amplifier that cannot be mutated is connected, improves overvoltage protection clamp voltage
Precision.
Referring to figure 2. and Fig. 3, a kind of amplifier switching mode overvoltage crowbar provided by the invention, including operation amplifier
Device OP1, first diode D1, the second diode D2, third diode D3, the 4th diode D4, the 5th diode D5, first
Effect pipe P1, the second field-effect tube P3, third field-effect tube N1, the 4th field-effect tube N2, first resistor R1, second resistance R2,
3rd resistor R3 and the 4th resistance R4；The operational amplifier OP1 include positive input Vin_p, reverse input end Vin_n and
Output end；
The positive input Vin_p of the operational amplifier is grounded by the 5th diode D5；The operational amplifier
Positive input Vin_p passes sequentially through the 4th field-effect tube N2 and the first field-effect tube P1 meets power vd D；The operational amplifier
Reverse input end Vin_n be electrically connected with one end of second resistance R2；One end of the second resistance R2 passes sequentially through the first electricity
Resistance R1, the 4th diode D4, the 4th resistance R4, third diode D3, the second diode D2 and first diode D1 connect power supply
VDD；The other end of the second resistance R2 is grounded；
The output end of the operational amplifier meets power vd D by the second field-effect tube P3, the operational amplifier it is defeated
Outlet passes sequentially through the second field-effect tube P3 and 3rd resistor R3 ground connection；
The power vd D is grounded by third field-effect tube N1.
As can be seen from the above description, the beneficial effects of the present invention are: amplifier switching mode overvoltage protection electricity provided by the invention
The characteristic and operational amplifier that road cannot be mutated using the pressure stabilizing of Zener diode and the voltage of reverse breakdown characteristics and capacitor
Output control field-effect tube whether be connected, compared to traditional overvoltage crowbar directly by A point control N1 grid voltage, less
It is easy to be influenced by temperature and technique, improves the precision of overvoltage protection clamp voltage, realize the overvoltage protection of high-precision clamper
It is protected with instantaneous overvoltage.Amplifier switching mode overvoltage crowbar structure provided by the invention is simple, high reliablity and precision are high, just
In popularization and application.
The concrete operating principle of amplifier switching mode overvoltage crowbar provided by the invention are as follows:
When the value of power vd D is in normal range of operation, the reverse input end Vin_n less-than operation of operational amplifier amplifies
When the positive input Vin_p of device, the output end output of operational amplifier is high level, and the second field-effect tube P3 ends at this time,
3rd resistor R3 no current flows through, and the grid of third field-effect tube N1 is connected to ground, N1 cut-off by R3, therefore does not influence power supply
The value of VDD.
When the value of power vd D is higher than the upper limit value of normal range of operation, so that the reverse input end of operational amplifier
Vin_n is greater than the positive input Vin_p of operational amplifier, and the output end output of operational amplifier, which is flipped, becomes low electricity
Flat, the second field-effect tube P3 is connected at this time, has electric current to flow through 3rd resistor R3, after the grid potential of third field-effect tube N1 is got higher
Conducting, the current potential of power vd D is dragged down, and the value of power vd D is prevented to continue to increase.
Power vd D external a resistance Rin, Vdc are added in the other end of resistance Rin.Amplifier switching mode provided by the invention
When overvoltage crowbar works, Vdc powers to VDD.
Amplifier switching mode overvoltage crowbar provided by the invention is to judge whether over-voltage with two input terminals of amplifier,
Whether output end control field-effect tube is connected, if drag down VDD, compared to it is traditional it is direct A point is controlled into N1 grid voltage, less
It is easy to be influenced by temperature and technique, realizes overvoltage protection and the instantaneous overvoltage protection of high-precision clamper.
Further, one end of the second resistance R2 of above-mentioned amplifier switching mode overvoltage crowbar passes through first resistor R1
It is electrically connected with the cathode of the 4th diode D4；The anode of the 4th diode D4 passes through the 4th resistance R4 and third diode D3
Anode electrical connection；The cathode of the third diode D3 is electrically connected with the cathode of the second diode D2；Second diode
The anode of D2 is electrically connected with the anode of first diode D1；The cathode of the first diode D1 meets power vd D.
Further, above-mentioned amplifier switching mode overvoltage crowbar further includes first capacitor C1；The first capacitor C1
The anode of one end and the 4th diode D4 be electrically connected, the other end of the first capacitor C1 is grounded.
By the description above it is found that first capacitor C1 is to avoid operational amplifier for eliminating extraneous frequency glitches
Accidentally touching is sentenced, and then mentions high control precision.
Further, above-mentioned amplifier switching mode overvoltage crowbar further includes the second capacitor C2；The second capacitor C2
One end be electrically connected with the output end of the operational amplifier, the other end of the second capacitor C2 ground connection.
By the description above it is found that the second capacitor C2 is to make the voltage on the second capacitor for eliminating momentary pulse voltage
It does not mutate.
Further, above-mentioned amplifier switching mode overvoltage crowbar further includes bias voltage Vbias；4th effect
Ying Guanwei N ditch is enhanced；4th field-effect tube includes source electrode, grid and drain electrode；First field-effect tube is the enhancing of P ditch
Type；First field-effect tube includes source electrode, grid and drain electrode；
The positive input Vin_p of the operational amplifier is electrically connected with the source electrode of the 4th field-effect tube N2；Described 4th
The grid of field-effect tube N2 and drain electrode are electrically connected after being connected with the source electrode of the first field-effect tube P1；
The drain electrode of the first field-effect tube P1 meets power vd D；The grid of the first field-effect tube P1 connects bias voltage
Vbias。
Further, the second field-effect tube P3 of above-mentioned amplifier switching mode overvoltage crowbar is that P ditch is enhanced；It is described
Second field-effect tube P3 includes source electrode, grid and drain electrode；The third field-effect tube N1 is that N ditch is enhanced；The third field effect
Should pipe N1 include source electrode, grid and drain electrode；
The source electrode of the second field-effect tube P3 is grounded by 3rd resistor R3；The grid of the second field-effect tube P3 with
The output end of the operational amplifier is electrically connected；The drain electrode of the second field-effect tube P3 meets power vd D；
The drain electrode of the third field-effect tube N1 meets power vd D；The source electrode of the third field-effect tube N1 is grounded；Described
The grid of three field-effect tube N1 is grounded by 3rd resistor R3.
Further, the positive input and the five or two of the operational amplifier of above-mentioned amplifier switching mode overvoltage crowbar
The cathode of pole pipe D5 is electrically connected, the plus earth of the 5th diode D5.
In conclusion a kind of amplifier switching mode overvoltage crowbar provided by the invention using Zener diode pressure stabilizing and
Whether the output control field-effect tube for the characteristic and operational amplifier that the voltage of reverse breakdown characteristics and capacitor cannot be mutated is led
It is logical, A point is directly controlled into N1 grid voltage compared to traditional overvoltage crowbar, it is more difficult to be influenced by temperature and technique,
The precision of overvoltage protection clamp voltage is improved, realizes overvoltage protection and the instantaneous overvoltage protection of high-precision clamper.The present invention mentions
The amplifier switching mode overvoltage crowbar structure of confession is simple, high reliablity and precision are high, easy to promote and utilize.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (6)
1. a kind of amplifier switching mode overvoltage crowbar, which is characterized in that including operational amplifier, first diode, the two or two
Pole pipe, third diode, the 4th diode, the 5th diode, the first field-effect tube, the second field-effect tube, third field-effect tube,
4th field-effect tube, first resistor, second resistance, 3rd resistor and the 4th resistance；The operational amplifier includes positive input
End, reverse input end and output end；
The positive input of the operational amplifier is grounded by the 5th diode；The positive input of the operational amplifier according to
It is secondary to pass through the 4th field-effect tube and the first field-effect tube connects power supply；The reverse input end of the operational amplifier and second resistance
One end electrical connection；One end of the second resistance pass sequentially through first resistor, the 4th diode, the 4th resistance, third diode,
Second diode and first diode connect power supply；The other end of the second resistance is grounded；
The output end of the operational amplifier is connect with the grid of the second field-effect tube, the source electrode and electricity of second field-effect tube
Source connection, the drain electrode of second field-effect tube are connect with the grid of third field-effect tube, the grid of the third field-effect tube
It is grounded by 3rd resistor；
The power supply is grounded by third field-effect tube；
One end of the second resistance is electrically connected by first resistor with the cathode of the 4th diode；4th diode is just
Pole is electrically connected by the 4th resistance with the anode of third diode；The cathode of the third diode and the cathode of the second diode
Electrical connection；The anode of second diode is electrically connected with the anode of first diode；The cathode of the first diode connects electricity
Source.
2. amplifier switching mode overvoltage crowbar according to claim 1, which is characterized in that further include first capacitor；Institute
The one end for stating first capacitor is electrically connected with the anode of the 4th diode, the other end ground connection of the first capacitor.
3. amplifier switching mode overvoltage crowbar according to claim 1, which is characterized in that further include the second capacitor；Institute
The one end for stating the second capacitor is electrically connected with the output end of the operational amplifier, the other end ground connection of second capacitor.
4. amplifier switching mode overvoltage crowbar according to claim 1, which is characterized in that further include bias voltage；Institute
Stating the 4th field-effect tube is that N ditch is enhanced；4th field-effect tube includes source electrode, grid and drain electrode；First field-effect
Pipe is that P ditch is enhanced；First field-effect tube includes source electrode, grid and drain electrode；
The positive input of the operational amplifier is electrically connected with the source electrode of the 4th field-effect tube；The grid of 4th field-effect tube
Pole and drain electrode are electrically connected after being connected with the drain electrode of the first field-effect tube；
The source electrode of first field-effect tube connects power supply；The grid of first field-effect tube connects bias voltage.
5. amplifier switching mode overvoltage crowbar according to claim 1, which is characterized in that second field-effect tube is
P ditch is enhanced；Second field-effect tube includes source electrode, grid and drain electrode；The third field-effect tube is that N ditch is enhanced；Institute
Stating third field-effect tube includes source electrode, grid and drain electrode；
The drain electrode of second field-effect tube is grounded by 3rd resistor；The grid of second field-effect tube is put with the operation
The output end electrical connection of big device；The source electrode of second field-effect tube connects power supply；
The drain electrode of the third field-effect tube connects power supply；The source electrode of the third field-effect tube is grounded；The third field-effect tube
Grid pass through 3rd resistor be grounded.
6. amplifier switching mode overvoltage crowbar according to claim 1, which is characterized in that the operational amplifier is just
It is electrically connected to input terminal with the cathode of the 5th diode, the plus earth of the 5th diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611254632.6A CN106786462B (en) | 2016-12-30 | 2016-12-30 | A kind of amplifier switching mode overvoltage crowbar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611254632.6A CN106786462B (en) | 2016-12-30 | 2016-12-30 | A kind of amplifier switching mode overvoltage crowbar |
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| Publication Number | Publication Date |
|---|---|
| CN106786462A CN106786462A (en) | 2017-05-31 |
| CN106786462B true CN106786462B (en) | 2019-03-08 |
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| CN201611254632.6A Expired - Fee Related CN106786462B (en) | 2016-12-30 | 2016-12-30 | A kind of amplifier switching mode overvoltage crowbar |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180374705A1 (en) * | 2017-06-23 | 2018-12-27 | Qualcomm Incorporated | Integrated transient voltage suppressor circuit |
| CN108808643B (en) * | 2018-05-31 | 2019-11-29 | 上海艾为电子技术股份有限公司 | A kind of analog switching circuit |
| CN110993601B (en) * | 2019-12-24 | 2023-11-24 | 中电国基南方集团有限公司 | ESD protection circuit based on GaAs technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572638Y (en) * | 2002-07-30 | 2003-09-10 | 艾默生网络能源有限公司 | Overvoltage protective circuit |
| CN101442046A (en) * | 2007-11-23 | 2009-05-27 | 上海华虹Nec电子有限公司 | Dynamic detection electrostatic protection circuit structure |
| CN101834436A (en) * | 2010-05-06 | 2010-09-15 | 日银Imp微电子有限公司 | Overvoltage protection circuit for integrated circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6744611B2 (en) * | 2002-10-28 | 2004-06-01 | System General Corporation | Over-voltage crowbar for lightning surge and ESD protection |
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2016
- 2016-12-30 CN CN201611254632.6A patent/CN106786462B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572638Y (en) * | 2002-07-30 | 2003-09-10 | 艾默生网络能源有限公司 | Overvoltage protective circuit |
| CN101442046A (en) * | 2007-11-23 | 2009-05-27 | 上海华虹Nec电子有限公司 | Dynamic detection electrostatic protection circuit structure |
| CN101834436A (en) * | 2010-05-06 | 2010-09-15 | 日银Imp微电子有限公司 | Overvoltage protection circuit for integrated circuit |
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Granted publication date: 20190308 |