CN206164350U - Drive circuit of switch tube - Google Patents
Drive circuit of switch tube Download PDFInfo
- Publication number
- CN206164350U CN206164350U CN201621142074.XU CN201621142074U CN206164350U CN 206164350 U CN206164350 U CN 206164350U CN 201621142074 U CN201621142074 U CN 201621142074U CN 206164350 U CN206164350 U CN 206164350U
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- CN
- China
- Prior art keywords
- switch tube
- type switch
- drive circuit
- voltage stabilizing
- driving chip
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Abstract
The utility model discloses a drive circuit of switch tube, include: driver chip, N type switch tube and voltage stabilizing module, wherein, driver chip has drive output end, power input end and first earthing terminal, voltage stabilizing module has steady voltage input, steady voltage output and second earthing terminal, driver chip's drive output end connects the grid of N type switch tube, and DC power supply is connected in the drain electrode of N type switch tube, the source connection voltage stabilizing module's of N type switch tube steady voltage output, and voltage stabilizing module's steady voltage input is held with driver chip's power input and is all connected drive power supply, voltage stabilizing module's second earthing terminal is connected with driver chip's first earthing terminal. The utility model provides a drive circuit of switch tube, simple structure, and can realize realizing on single power driven basis the function of negative pressure shutdown switch pipe effectively preventing the spurious triggering of switch tube, guarantee the reliable turn -off of switch tube.
Description
Technical field
This utility model is related to electric switch and field of switch power, more particularly to a kind of drive circuit of switching tube.
Background technology
Traditional N type switch tube, such as N-type MOSFET (Metal-Oxide-Semiconductor Field-Effect
Transistor, Metal-Oxide Semiconductor field-effect transistor), its source electrode is normally coupled to ground, and switch tube driving circuit
Drive signal is typically applied directly to grid through resistance, therefore, as long as grid voltage reaches its conducting voltage and will turn on.So
And, when powered N-type MOSFET works in the environment of aging or chronic exposure, its gate drive voltage significantly can drop
Low, in some instances it may even be possible to be reduced to the state for being close to no-voltage, now, MOSFET is difficult reliable turn-off；Or, the MOSFET being turned off
It is susceptible to the phenomenon for misleading；Also or, MOSFET is operated in the range of linearity state not complete switched off, so as to causing therefore
Barrier.
Existing solution increased negative pressure breaking circuit on the basis of conventional driving circuit, as shown in figure 1, being existing
There is the drive circuit of N-type MOSFET in technology, when input signal is zero level, resistance R1, R5, R2, R3 and audion T2
Colelctor electrode-emitter voltage drop together decided on the negative voltage amplitude of A points, realize its grid, source electrode two when MOSFET is turned off
Type of drive of the end with negative voltage, it is ensured that N-type MOSFET still is able to reliability in the case where gate drive voltage is significantly reduced
Shut-off.
However, during this utility model is implemented, inventor has found that existing technical scheme at least has following asking
Topic：Drive circuit is complicated, thus the analytical calculation of circuit is also complicated；In addition, it is desirable to increase extra negative voltage power.
Utility model content
For the problem that prior art is present, the purpose of this utility model is to provide a kind of drive circuit of switching tube,
Simple structure, and can realize the function of negative pressure on-off switching tube is realized on the basis of single supply drives, effectively prevent switch
The false triggering of pipe, it is ensured that the reliable turn-off of switching tube.
This enforcement new embodiment provides a kind of drive circuit of switching tube, including driving chip, N type switch tube and voltage stabilizing
Module；
Wherein, the driving chip has drive output, power input and the first earth terminal；The Voltage stabilizing module tool
There are voltage stabilizing input, output end of pressure-stabilizing and the second earth terminal；
The drive output of the driving chip connects the grid of the N type switch tube, and the drain electrode of the N type switch tube connects
DC source is connect, the source electrode of the N type switch tube connects the output end of pressure-stabilizing of the Voltage stabilizing module, the voltage stabilizing of the Voltage stabilizing module
The power input of input and the driving chip is all connected with driving power supply；Second earth terminal of the Voltage stabilizing module with it is described
The first earth terminal connection of driving chip.
In above-mentioned technical proposal, burning voltage is exported by Voltage stabilizing module, the source electrode of N type switch tube is carried in；Work as driving
During chip output high level, the grid voltage of the N type switch tube is constantly raised, and is reached in the gate source voltage of the N type switch tube
During to conducting voltage, the N type switch tube conducting；When the driving chip exports low level, the grid of the N type switch tube
Voltage is pulled to ground level, and the gate source voltage of the N type switch tube is negative voltage, then the N type switch tube shut-off.This practicality is new
The drive circuit of the switching tube of type is realized when N type switch tube is turned off, its grid, source two ends on the basis of single supply driving
Type of drive with negative voltage, effectively prevents the false triggering of N type switch tube, it is ensured that the reliable turn-off of N type switch tube；And structure
Simply, calculate without the need for complicated circuit analysis.
Preferably, the drive circuit of the switching tube also includes first resistor；
The drain electrode connection DC source of the N type switch tube, specially：The drain electrode of the N type switch tube is by described the
One resistance connects the DC source.
In this preferred version, equivalent load resistance-first resistor is connected by the drain electrode in the N type switch tube,
Can from when the N type switch tube is turned on metering function, reduce the power attenuation of the N type switch tube, prevent the N-type from opening
Manage drastically hot or even moment and burn in pass.
Preferably, the drive circuit of the switching tube also includes second resistance；
The drive output of the driving chip connects the grid of the N type switch tube, specially：The driving chip
Drive output connects the grid of the N type switch tube by the second resistance.
In this preferred version, as the grid of the N type switch tube is under the excitation of the driving pulse of the driving chip
Very strong vibration may be produced, therefore, connect the second resistance in the grid of the N type switch tube, grid can be eliminated and shaken
Swing；Meanwhile, the second resistance can also affect the break-make speed of the N type switch tube.
Preferably, the N type switch tube is at least N-type field effect transistor, N-type bipolar transistor, N-type IGCT wherein
It is a kind of.
Preferably, the Voltage stabilizing module includes the first electric capacity, stabilivolt and 3rd resistor；
One end of the 3rd resistor is the voltage stabilizing input, and the other end of the 3rd resistor is voltage stabilizing output
End；
The anode of the stabilivolt is second earth terminal, and the negative electrode of the stabilivolt connects the output end of pressure-stabilizing；
The positive pole of first electric capacity connects the output end of pressure-stabilizing, and the negative pole connection described second of first electric capacity connects
Ground terminal.
Preferably, the drive circuit of the switching tube also includes the second electric capacity；
The positive pole of second electric capacity connects the power input of the driving chip, the negative pole connection of second electric capacity
First earth terminal of the driving chip.
In this preferred version, by power input second electric capacity in parallel in the driving chip, for filtering
Except noise, make the driving chip can be with steady operation.
Description of the drawings
In order to be illustrated more clearly that the technical solution of the utility model, below by to be used attached needed for embodiment
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present utility model, for
For those of ordinary skill in the art, on the premise of not paying creative work, can be obtaining other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of structural representation of the drive circuit of switching tube with negative pressure shut-off of prior art.
Fig. 2 is the structural representation of one embodiment of the drive circuit of the switching tube that this utility model is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only this utility model a part of embodiment, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
Fig. 2 is referred to, is the structural representation of one embodiment of the drive circuit of the switching tube that this utility model is provided.
The drive circuit of the switching tube that this utility model embodiment is provided, including driving chip 11, N type switch tube 12 and steady
Die block 13；
Wherein, the driving chip 11 has drive output DRIVE, power input VCC and the first earth terminal COM；
The Voltage stabilizing module 13 has voltage stabilizing input A, output end of pressure-stabilizing B and the second earth terminal K；
Drive output DRIVE of the driving chip 11 connects the grid G of the N type switch tube 12, the N-type switch
The drain D connection DC source of pipe 12, the source S of the N type switch tube 12 connect the output end of pressure-stabilizing of the Voltage stabilizing module 13
A, the power input VCC of the voltage stabilizing input B and the driving chip 11 of the Voltage stabilizing module 13 are all connected with driving power supply；Institute
State the second earth terminal K of Voltage stabilizing module 13 to be connected with the first earth terminal COM of the driving chip 11.
Further, the drive circuit of the switching tube also includes first resistor R1；
Then the drain D of the N type switch tube 12 connects DC source, specially：The drain D of the N type switch tube 12 is led to
Cross first resistor R1Connect the DC source.
In the present embodiment, equivalent load resistance-described first is connected by the drain D in the N type switch tube 12 electric
Resistance R1, can from when the N type switch tube 12 is turned on metering function, reduce the power attenuation of the N type switch tube 12, prevent
The N type switch tube 12 is drastically hot or even moment burns.
Further, the drive circuit of the switching tube also includes second resistance R2；
Then drive output DRIVE of the driving chip 11 connects the grid G of the N type switch tube 12, specially：Institute
Drive output DRIVE of driving chip 11 is stated by second resistance R2Connect the grid G of the N type switch tube 12.
In the present embodiment, due to the N type switch tube 12 grid G the driving chip 11 driving pulse swash
Encourage down and may produce very strong vibration, therefore, connect second resistance R in the grid G of the N type switch tube 122, can disappear
Except grid vibrates；Meanwhile, second resistance R2The break-make speed of the N type switch tube 12 can also be affected, it is, described
Second resistance R2Less, the break-make speed of the N type switch tube 12 is faster, and switching loss is less；Conversely, the N type switch tube
12 break-make speed is slower, and switching loss is bigger.If however, second resistance R2Too little, then the N type switch tube 12 is logical
Disconnected excessive velocities, greatly improve will the grid of the N type switch tube 12, the voltage and current rate of change at source two ends, so as to produce
Larger interference, the serious whole circuit that will make cannot work；If second resistance R2It is too big, the N type switch tube 12
Gate source voltage reach the conducting voltage time get over it is longer, the N type switch tube 12 in half conducting state time it is also longer；The N
The internal resistance under half conducting state of type switching tube 12 is larger, and heating also increases therewith, so as to easily damage the N type switch tube 12,
Therefore, selecting second resistance R2When, it is necessary to both situations above of making overall plans, these can be carried out according to specific circumstances
Arrange, this utility model does not do specific restriction.
Preferably, the N type switch tube 12 be at least N-type field effect transistor, N-type bipolar transistor, N-type IGCT its
Middle one kind.
Further, the Voltage stabilizing module 13 includes the first electric capacity C1, stabilivolt Z and 3rd resistor R3；
3rd resistor R3One end be the voltage stabilizing input A, 3rd resistor R3The other end be the voltage stabilizing
Outfan B；
The anode of the stabilivolt Z is the second earth terminal K, and the negative electrode of the stabilivolt Z connects the voltage stabilizing output
End B；
The first electric capacity C1Positive pole connect the output end of pressure-stabilizing B, the first electric capacity C1Negative pole connection described the
Two earth terminal K.
Further, the drive circuit of the switching tube also includes the second electric capacity C2；
The second electric capacity C2Positive pole connect the power input VCC, the second electric capacity C of the driving chip 112's
Negative pole connects the first earth terminal COM of the driving chip 11.
In the present embodiment, by power input VCC the second electric capacity C in parallel in the driving chip 112, use
In noise is filtered, make the driving chip 11 can be with steady operation.
The operation principle of the drive circuit of the switching tube of the present embodiment explained below：
When the driving power supply VCC normal power supply, the first electric capacity C of the Voltage stabilizing module 131Start to charge up, described
One electric capacity C1Clamp voltage Vz of the voltage after being full of equal to the stabilivolt Z, now, the stabilivolt Z works in electrical breakdown
Area, its backward voltage become little with electric current, so as to by the source voltage clamper of the N type switch tube 12 in Vz.
When the drive output DRIVE output high level of the driving chip 11, the grid electricity of the N type switch tube 12
Pressure is raised, and when the gate source voltage of the N type switch tube 12 reaches its conducting voltage, the N type switch tube 12 is turned on；Work as institute
When stating the drive output DRIVE output low level of driving chip 11, the grid voltage of the N type switch tube 12 is pulled to ground electricity
Flat, then the gate source voltage of the N type switch tube 12 is equal to-Vz, and now the N type switch tube 12 is turned off.
The drive circuit of the switching tube that this utility model is provided, has the advantages that：It is steady by Voltage stabilizing module output
Determine voltage, be carried in the source electrode of N type switch tube；When driving chip exports high level, the grid voltage of the N type switch tube is not
It is disconnected to raise, when the gate source voltage of the N type switch tube reaches conducting voltage, the N type switch tube conducting；When the driving core
During piece output low level, the grid voltage of the N type switch tube is pulled to ground level, and the gate source voltage of the N type switch tube is
Negative voltage, then the N type switch tube shut-off.The drive circuit of switching tube of the present utility model single supply driving on the basis of,
Realize when N type switch tube is turned off, its grid, source two ends have the type of drive of negative voltage, effectively prevent the mistake of N type switch tube
Triggering, it is ensured that the reliable turn-off of N type switch tube；And simple structure, calculate without the need for complicated circuit analysis.
Above disclosed is only a kind of preferred embodiment of this utility model, can not limit this practicality with this certainly
New interest field, one of ordinary skill in the art will appreciate that all or part of flow process of above-described embodiment is realized, and according to
The equivalent variations made by this utility model claim, still fall within the scope covered by utility model.
One of ordinary skill in the art will appreciate that all or part of flow process in realizing above-described embodiment method, can be
Instruct related hardware to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Claims (7)
1. a kind of drive circuit of switching tube, it is characterised in that include：Driving chip, N type switch tube and Voltage stabilizing module；
Wherein, the driving chip has drive output, power input and the first earth terminal；The Voltage stabilizing module has steady
Pressure input, output end of pressure-stabilizing and the second earth terminal；
The drive output of the driving chip connects the grid of the N type switch tube, and the drain electrode connection of the N type switch tube is straight
Stream power supply, the source electrode of the N type switch tube connect the output end of pressure-stabilizing of the Voltage stabilizing module, the voltage stabilizing input of the Voltage stabilizing module
The power input of end and the driving chip is all connected with driving power supply；Second earth terminal of the Voltage stabilizing module and the driving
The first earth terminal connection of chip.
2. the drive circuit of switching tube as claimed in claim 1, it is characterised in that the drive circuit of the switching tube also includes
First resistor；
The drain electrode connection DC source of the N type switch tube, specially：The drain electrode of the N type switch tube is electric by described first
The resistance connection DC source.
3. the drive circuit of switching tube as claimed in claim 1 or 2, it is characterised in that the drive circuit of the switching tube is also
Including second resistance；
The drive output of the driving chip connects the grid of the N type switch tube, specially：The driving of the driving chip
Outfan connects the grid of the N type switch tube by the second resistance.
4. the drive circuit of switching tube as claimed in claim 1, it is characterised in that the N type switch tube is N-type field effect
Pipe, N-type bipolar transistor, the one of which of N-type IGCT.
5. the drive circuit of switching tube as claimed in claim 1, it is characterised in that the Voltage stabilizing module include the first electric capacity,
Stabilivolt and 3rd resistor；
One end of the 3rd resistor is the voltage stabilizing input, and the other end of the 3rd resistor is the output end of pressure-stabilizing；
The anode of the stabilivolt is second earth terminal, and the negative electrode of the stabilivolt connects the output end of pressure-stabilizing；
The positive pole of first electric capacity connects the output end of pressure-stabilizing, negative pole connection second ground connection of first electric capacity
End.
6. the drive circuit of the switching tube as described in claim 1 or 2 or 4 or 5, it is characterised in that the driving of the switching tube
Circuit also includes the second electric capacity；
The positive pole of second electric capacity connects the power input of the driving chip, and the negative pole connection of second electric capacity is described
First earth terminal of driving chip.
7. the drive circuit of switching tube as claimed in claim 3, it is characterised in that the drive circuit of the switching tube also includes
Second electric capacity；
The positive pole of second electric capacity connects the power input of the driving chip, and the negative pole connection of second electric capacity is described
First earth terminal of driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621142074.XU CN206164350U (en) | 2016-10-20 | 2016-10-20 | Drive circuit of switch tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621142074.XU CN206164350U (en) | 2016-10-20 | 2016-10-20 | Drive circuit of switch tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206164350U true CN206164350U (en) | 2017-05-10 |
Family
ID=58653722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621142074.XU Active CN206164350U (en) | 2016-10-20 | 2016-10-20 | Drive circuit of switch tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206164350U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248859A (en) * | 2017-06-12 | 2017-10-13 | 上海电缆研究所有限公司 | A kind of IGBT soft switchings drive circuit |
| CN107612535A (en) * | 2017-10-31 | 2018-01-19 | 东莞博力威电池有限公司 | Improve the exciting circuit of power field effect pipe driving voltage |
| CN112466242A (en) * | 2019-09-06 | 2021-03-09 | 深圳芯能半导体技术有限公司 | Grid driving device based on single output channel driving IC |
-
2016
- 2016-10-20 CN CN201621142074.XU patent/CN206164350U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248859A (en) * | 2017-06-12 | 2017-10-13 | 上海电缆研究所有限公司 | A kind of IGBT soft switchings drive circuit |
| CN107248859B (en) * | 2017-06-12 | 2020-06-16 | 上海电缆研究所有限公司 | IGBT soft turn-off driving circuit |
| CN107612535A (en) * | 2017-10-31 | 2018-01-19 | 东莞博力威电池有限公司 | Improve the exciting circuit of power field effect pipe driving voltage |
| CN112466242A (en) * | 2019-09-06 | 2021-03-09 | 深圳芯能半导体技术有限公司 | Grid driving device based on single output channel driving IC |
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