CN208971379U - A kind of anti-overshoot protection circuit - Google Patents
A kind of anti-overshoot protection circuit Download PDFInfo
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- CN208971379U CN208971379U CN201821841671.0U CN201821841671U CN208971379U CN 208971379 U CN208971379 U CN 208971379U CN 201821841671 U CN201821841671 U CN 201821841671U CN 208971379 U CN208971379 U CN 208971379U
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Abstract
The utility model discloses a kind of anti-overshoot protection circuits, it include: first switch tube, gate driving circuit, input overshoot detection circuit and grid clamping circuit, gate driving circuit is used to drive the on or off of first switch tube, grid clamping circuit is used to control the on or off of first switch tube, when there are when upward skip signal for the input power that the input terminal of anti-overshoot protection circuit receives, input overshoot detection circuit detects skip signal, and send a signal to grid clamping circuit, the grid potential of first switch tube is clamped, out-put supply is set not follow input power to overshoot upwards, protect the safety of output end institute interface unit.By anti-overshoot protection circuit provided by the utility model, the source electrode of first switch tube can be made to be reduced by drain voltage overshoot effect, so that the voltage of source electrode institute interface unit be protected to be in safe range, avoid the risk of damage output end institute interface unit.
Description
Technical field
The utility model relates to IC design technical fields, more particularly to a kind of anti-overshoot protection circuit.
Background technique
In power management class chip, the common electricity for having integrated very large-sized NMOS (N-type MOS transistor)
Large-sized NMOS is integrated in road, such as load switch chip as power switch.Can also it make in some power-switching circuits
Power supply conversion is carried out with large-sized NMOS tube, the at this moment drain electrode of NMOS and source electrode can be separately connected two power supplys.Make above-mentioned
With in environment, the drain electrode of NMOS can all be connected to a power supply, and when power-supply fluctuation will result in the source that NMOS is connected
Generate fluctuation.
As shown in FIG. 1, FIG. 1 is a kind of power-switching circuits in the prior art, wherein first switch tube M1, second switch
Pipe M2, N switching tube Mn are NMOS, which is converted to three out-put supply VDD1 for input power VIN by M1, M2, Mn,
VDD2, VDDn, input power VIN are external interface power supply, are easy to be interfered.For example, when the end VIN is influenced by surge,
The input voltage at the end VIN rapidly can be jumped up, then out-put supply VDD1~VDDn also can be jumped and then upwards, if out-put supply
VDD1~VDDn becomes too high, then there is the risk of damage VDD1~VDDn institute interface unit.
Utility model content
The purpose of this utility model is that proposing a kind of anti-overshoot protection circuit, out-put supply is inhibited to follow input to realize
The upward overshoot of power supply avoids the risk of damage output end institute interface unit.
Following technical scheme that in order to achieve the above object, the utility model provides:
A kind of anti-overshoot protection circuit, comprising: first switch tube, gate driving circuit, input overshoot detection circuit and grid
Pole clamp circuit, in which:
The drain electrode of the first switch tube, the first end of the input overshoot detection circuit and the gate driving circuit
First end is connected, input terminal of the common end as the anti-overshoot protection circuit, receives input power, the first switch tube
Output end of the source electrode as the anti-overshoot protection circuit, the out-put supply after output conversion；
The grid of the second switch is connected with the first end of the grid clamping circuit, the grid clamping circuit
Second end is connected with the second end of the input overshoot detection circuit, and the third end of the grid clamping circuit and the grid drive
The second end of dynamic circuit is connected；
The gate driving circuit is used to drive the on or off of the first switch tube, and the grid clamping circuit is used
In the on or off for controlling the first switch tube, when the input that the input terminal of the anti-overshoot protection circuit receives
For power supply there are when upward skip signal, the input overshoot detection circuit detects the skip signal, and sends a signal to
The grid clamping circuit, the grid potential of the first switch tube is clamped, and the out-put supply is made not follow input
Power supply overshoots upwards, protects the safety of output end institute interface unit.
Further, the input overshoot detection circuit includes: resistance, capacitor, voltage source and comparator, in which:
One end of the capacitor is connected with one end of the resistance, and common end is as the input overshoot detection circuit
First end is connected with the first end of the gate driving circuit；
The other end of the capacitor is grounded, and one end of the resistance is defeated by the reverse phase of the voltage source and the comparator
Enter end to be connected, the other end of the resistance is connected with the normal phase input end of the comparator；The output end conduct of the comparator
The second end of the input overshoot detection circuit is connected with the second end of the grid clamping circuit.
Further, the grid clamping circuit includes second switch, described in the drain electrode conduct of the second switch
The first end of grid clamping circuit is connected with the grid of the first switch tube, the source electrode ground connection of the second switch, described
Second end phase of the grid of second switch as the second end and the input overshoot detection circuit of the grid clamping circuit
Even.
It can be seen via above technical scheme that compared with prior art, the utility model discloses a kind of anti-overshoot protections
Circuit, comprising: first switch tube, gate driving circuit, input overshoot detection circuit and grid clamping circuit, gate driving circuit
For driving the on or off of first switch tube, grid clamping circuit is used to control the on or off of first switch tube, when
The input power that the input terminal of anti-overshoot protection circuit receives there are when upward skip signal, examine by input overshoot detection circuit
Skip signal is measured, and sends a signal to grid clamping circuit, the grid potential of first switch tube is clamped, makes output electricity
Source does not follow input power to overshoot upwards, protects the safety of output end institute interface unit.Pass through anti-mistake provided by the utility model
Punching protection circuit, can be such that the source electrode of first switch tube is reduced by drain voltage overshoot effect, to protect source electrode institute connector
The voltage of part is in safe range, avoids the risk of damage output end institute interface unit.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of power-switching circuit structural schematic diagram provided in the prior art；
Fig. 2 is a kind of anti-overshoot protection circuit structure block diagram provided by the embodiment of the utility model；
Fig. 3 is a kind of anti-a kind of specific embodiment schematic diagram of overshoot protection circuit provided by the embodiment of the utility model；
Fig. 4 is a kind of anti-overshoot protection circuit another kind specific embodiment signal provided by the embodiment of the utility model
Figure.
Specific embodiment
Term is explained:
Integrated circuit (Integrated Circuit) is a kind of microelectronic device or component, using certain technique,
The elements such as transistor, resistance, capacitor and inductance needed for a circuit and wiring be interconnected, be produced on a fritter or
On a few fritter semiconductor wafers or dielectric substrate, it is then encapsulated in a shell, becomes with the miniature of required circuit function
Structure, also referred to as chip or IC.
MOSFET: Metal-Oxide Semiconductor field effect transistor, abbreviation metal-oxide half field effect transistor (English spelling:
Metal-Oxide-Semiconductor Field-Effect Transistor) it is that one kind can be widely used in simulation electricity
The field-effect transistor (Field-Effect Transistor) on road and digital circuit.MOSFET is according to its " channel " (work current-carrying
Son) polarity it is different, the two types of " N-type " Yu " p-type ", also commonly known as NMOSFET and PMOSFET, abbreviation can be divided into
It still include NMOS, PMOS.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Fig. 2, the utility model embodiment provides a kind of anti-overshoot protection circuit, the anti-overshoot protection circuit packet
It includes: first switch tube M1, gate driving circuit 11, input overshoot detection circuit 12 and grid clamping circuit 13, in which:
The drain electrode of above-mentioned first switch tube M1, the first end of above-mentioned input overshoot detection circuit 12 and above-mentioned gate driving are electric
The first end on road 11 is connected, input terminal IN of the common end as above-mentioned anti-overshoot protection circuit, receives input power VIN, above-mentioned
Output end OUT of the source electrode of first switch tube M1 as above-mentioned anti-overshoot protection circuit, the out-put supply V after output conversionOUT；
The grid of above-mentioned second switch M1 is connected with the first end of above-mentioned grid clamping circuit 13, above-mentioned grid clamping electricity
The second end of the second end on road 13 and above-mentioned input overshoot detection circuit 12 is connected, the third end of above-mentioned grid clamping circuit 13 and
The second end of above-mentioned gate driving circuit 11 is connected；
Above-mentioned gate driving circuit 11 is used to drive the on or off of above-mentioned first switch tube M1, above-mentioned grid clamping electricity
Road 13 is used to control the on or off of above-mentioned first switch tube M1, when the input terminal IN of above-mentioned anti-overshoot protection circuit is received
Above-mentioned input power VINThere are when upward skip signal, above-mentioned input overshoot detection circuit 12 detects above-mentioned jump letter
Number, and above-mentioned grid clamping circuit 13 is sent a signal to, the grid potential of above-mentioned first switch tube M1 is clamped, is made above-mentioned
Out-put supply VOUTIt does not follow input power to overshoot upwards, protects the safety of above-mentioned output end OUT institute interface unit.
Anti- overshoot protection circuit provided by the embodiment of the utility model is as shown in Figure 2, wherein first switch tube M1 is
NMOS, drain electrode are IN, provide power supply VIN, source electrode OUT, the out-put supply V after output conversionOUT, first switch tube M1
By power supply VINBe converted to VOUT, gate driving circuit 11 is for controlling first switch tube M1 on or off.Work as VINIt is oriented
On rapid jumping signal when, input overshoot detection circuit detects the skip signal, and send a signal to grid clamping circuit 13,
The grid potential of first switch tube M1 is clamped, to make VOUTDo not follow VINOvershoot upwards, obtain one it is more stable
VOUT, protect the safety of output end OUT institute interface unit.
As shown in figure 3, above-mentioned input overshoot detection circuit 12 includes: resistance R, capacitor C, voltage source Vd and comparator P,
In:
One end of above-mentioned capacitor C is connected with one end of above-mentioned resistance R, and common end overshoots detection circuit as above-mentioned input
12 first end is connected with the first end of above-mentioned gate driving circuit 11；
The other end of above-mentioned capacitor C is grounded, and one end of above-mentioned resistance R passes through above-mentioned voltage source Vd's and above-mentioned comparator P
Inverting input terminal (-) is connected, and the other end of above-mentioned resistance R is connected with the normal phase input end (+) of above-mentioned comparator P；Above-mentioned comparison
Second end and the second end phase of above-mentioned grid clamping circuit 13 of the output end of device P as above-mentioned input overshoot detection circuit 12
Even.
As shown in figure 3, above-mentioned grid clamping circuit 13 includes second switch M2, the drain electrode of above-mentioned second switch M2 is made
It is connected for the first end of above-mentioned grid clamping circuit 13 with the grid of above-mentioned first switch tube M1, the source of above-mentioned second switch M2
The grid of pole ground connection, above-mentioned second switch M2 is detected as the second end of above-mentioned grid clamping circuit 13 and above-mentioned input overshoot
The second end of circuit 12 is connected.
In Fig. 3, resistance R, capacitor C, voltage source Vd and comparator P together constitute input overshoot detection circuit 12, M2
For grid clamping circuit 13.When normal work, gate driving circuit 11 drives the grid of first switch tube M1 by resistance R, is
The grid of first switch tube M1 provides driving voltage, and therefore, the both end voltage of resistance R has following relationship Vn >=Vp always, that is, opens
Vn > Vp when dynamic state；Vn=Vp when stable state.If the voltage of power input IN has a upward rapid jumping, by
Larger in the size of first switch tube M1, parasitic capacitance is also very big, passes through the drain and gate parasitic capacitance of first switch tube M1
CgdCoupling, the grid voltage Vp of first switch tube M1 can be made to follow rising, if without any processing, due to leading for NMOS tube
Logical characteristic, the output voltage V of output end OUTOUTV can be followedINRise together with Vp voltage.Since Vn point is maintained by capacitor C, this
When momentary status be Vp > Vn, if Vp-Vd > Vn, height is turned in comparator P output, and it is upward to judge that power input IN occurs
Overshoot event occurs, and so that second switch M2 is released the grid voltage of first switch tube M1, to avoid first switch
The grid voltage of pipe M1 rises too high, to make the output voltage V of output end OUTOUTIt is clamped at safe range, wherein Vd is
One secure threshold, may be set to several hundred mV or so, this is in order to avoid the tiny fluctuation of input terminal IN causes comparator P accidentally to turn over
Turn, thus the behavior of mistake released to the grid of first switch tube M1.
In addition, as shown in figure 4, more being simplified and practical example for another, in Fig. 4, second switch M2 is
PMOS tube, wherein second switch M2 realize comparator P while ingenious and release to the drop-down of first switch tube M1 two
Kind function.As the input voltage V of input terminal ININWhen overshoot upwards occurs, then it will lead to Vp-Vn > Vth_M2When, second switch
The gate charge of first switch tube M1 is released to ground by M2 conducting, and the grid of nip first switch tube M1 exports to clamp
Hold the output voltage V of OUTOUT.V hereinth_M2It is the turn-on threshold voltage of second switch M2, effect is equal to the safety in Fig. 3
Threshold value Vd.
Anti- overshoot protection circuit in the utility model embodiment, can make the source electrode of first switch tube by drain voltage mistake
Punching influences to reduce, so that the voltage of source electrode institute interface unit be protected to be in safe range, avoids damage output end institute connector
The risk of part；Meanwhile the circuit belongs to opened loop control, closed-loop control response speed more in the prior art is very fast.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion so that article or equipment including a series of elements not only include those elements, but also is wrapped
Other elements that are not explicitly listed are included, or further include for this article or the intrinsic element of equipment.Do not having more
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that include above-mentioned element article or
There is also other identical elements in person's equipment.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (3)
1. a kind of anti-overshoot protection circuit characterized by comprising first switch tube, gate driving circuit, input overshoot detection
Circuit and grid clamping circuit, in which:
The drain electrode of the first switch tube, the input overshoot the first end and the first of the gate driving circuit of detection circuit
End is connected, input terminal of the common end as the anti-overshoot protection circuit, receives input power, the source of the first switch tube
Output end of the pole as the anti-overshoot protection circuit, the out-put supply after output conversion；
The grid of the first switch tube is connected with the first end of the grid clamping circuit, and the second of the grid clamping circuit
It holds and is connected with the second end of the input overshoot detection circuit, the third end of the grid clamping circuit and gate driving electricity
The second end on road is connected；
The gate driving circuit is used to drive the on or off of the first switch tube, and the grid clamping circuit is for controlling
The on or off for making the first switch tube, when the input power that the input terminal of the anti-overshoot protection circuit receives
There are when upward skip signal, the input overshoot detection circuit detects the skip signal, and sends a signal to described
Grid clamping circuit clamps the grid potential of the first switch tube, and the out-put supply is made not follow input power
Overshoot upwards, protects the safety of output end institute interface unit.
2. anti-overshoot protection circuit according to claim 1, which is characterized in that the input overshoots detection circuit and includes:
Resistance, capacitor, voltage source and comparator, in which:
One end of the capacitor is connected with one end of the resistance, and common end overshoots the first of detection circuit as the input
End is connected with the first end of the gate driving circuit；
The other end of the capacitor is grounded, the inverting input terminal that one end of the resistance passes through the voltage source and the comparator
It is connected, the other end of the resistance is connected with the normal phase input end of the comparator；Described in the output end of the comparator is used as
The second end of input overshoot detection circuit is connected with the second end of the grid clamping circuit.
3. anti-overshoot protection circuit according to claim 1, which is characterized in that the grid clamping circuit is opened including second
Guan Guan, the second switch drain electrode as the grid clamping circuit first end and the first switch tube grid phase
Even, the source electrode ground connection of the second switch, second end of the grid of the second switch as the grid clamping circuit
It is connected with the second end of the input overshoot detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821841671.0U CN208971379U (en) | 2018-11-08 | 2018-11-08 | A kind of anti-overshoot protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821841671.0U CN208971379U (en) | 2018-11-08 | 2018-11-08 | A kind of anti-overshoot protection circuit |
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| CN208971379U true CN208971379U (en) | 2019-06-11 |
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| CN201821841671.0U Active CN208971379U (en) | 2018-11-08 | 2018-11-08 | A kind of anti-overshoot protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245507A (en) * | 2018-11-08 | 2019-01-18 | 上海艾为电子技术股份有限公司 | A kind of anti-overshoot protection circuit |
| CN112448568A (en) * | 2019-08-30 | 2021-03-05 | 圣邦微电子（北京）股份有限公司 | Overvoltage clamping circuit |
-
2018
- 2018-11-08 CN CN201821841671.0U patent/CN208971379U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245507A (en) * | 2018-11-08 | 2019-01-18 | 上海艾为电子技术股份有限公司 | A kind of anti-overshoot protection circuit |
| CN109245507B (en) * | 2018-11-08 | 2024-02-09 | 上海艾为电子技术股份有限公司 | Overshoot-preventing protection circuit |
| CN112448568A (en) * | 2019-08-30 | 2021-03-05 | 圣邦微电子（北京）股份有限公司 | Overvoltage clamping circuit |
| CN112448568B (en) * | 2019-08-30 | 2021-11-05 | 圣邦微电子（北京）股份有限公司 | Overvoltage clamping circuit |
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