CN106655137A - Surge protection circuit and electronic equipment - Google Patents
Surge protection circuit and electronic equipment Download PDFInfo
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- CN106655137A CN106655137A CN201611213586.5A CN201611213586A CN106655137A CN 106655137 A CN106655137 A CN 106655137A CN 201611213586 A CN201611213586 A CN 201611213586A CN 106655137 A CN106655137 A CN 106655137A
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- voltage
- input
- circuit
- surge
- input port
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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
Abstract
The invention provides a surge protection circuit and electronic equipment coupled to an input port. The surge protection circuit comprises a detection circuit, a voltage amplifier circuit and a surge discharge circuit, wherein the detection circuit is suitable for detecting input voltage received by the input port; when the input voltage exceeds clamp voltage, first break-over voltage is generated at an output end of the detection circuit; the voltage amplifier circuit is used for receiving the first break-over voltage and is suitable for amplifying the first break-over voltage to obtain second break-over voltage and outputting the second break-over voltage through the output end of the voltage amplifier circuit; and the surge discharge circuit is used for receiving the second break-over voltage and discharging the input port when the second break-over voltage is greater than a preset value, wherein the higher the second break-over voltage is, the higher the discharge rate of the surge discharge circuit on the input port is. When surge voltage is detected, effective protection on the input port is achieved through fast discharging the input port.
Description
Technical field
The present invention relates to electronic circuit design field, more particularly to a kind of surge protection circuit and electronic equipment.
Background technology
Surge voltage (Surge Voltage) is a kind of transient voltage beyond normal voltage, refers generally to appearance in electrical network
High-voltage pulse of the short time (generally in Microsecond grade) as " wave ".The producing cause of surge voltage is possibly struck by lightning, electrostatic
Electric discharge, Industrial Incidents, action (the large-scale load on electrical network is switched on or switched off), electrical network shakiness on high-voltage power-line etc..
In most cases, surge voltage can damage circuit and its part, and its damaged condition is closely related with the compressive resistance of components and parts.Wave
Gushing voltage may cause the calamitous harm for directly burning circuit devcie, it is also possible to be caused by multiple little surge build-up effects
The decline of performance of semiconductor device, the accumulation harm of the lost of life.Surge voltage phenomenon jeopardizes automation with being on the rise and sets
Standby trouble free service, eliminates surge noise interference, prevents swell damage to be always related to automation equipment safe and reliable operation
Key problem.
In the prior art, patent document US20140233139A1 and US20150303678A1 propose respectively a kind of wave
Protection circuit is gushed, by arranging large-sized transistor as the path of releasing of surge voltage, so that in the input of circuit
When surge voltage on port exceeds preset value, the transistor turns carry out earial drainage to the input port, realize to circuit
Protection.
Because the time that surge voltage occurs is extremely short, in order to ensure the protected effect to above-mentioned input port, on the one hand need
Surge protection circuit is wanted to rapidly detect surge voltage, and the input port started to there is surge voltage carries out earial drainage, separately
On the one hand, after surge protection circuit starts earial drainage, The faster the better for the speed of earial drainage.However, patent document
Surge protection circuit in US20140233139A1 is excessively slow to the earial drainage speed of input port；Patent document
Response of the surge protection circuit in US20150303678A1 to surge voltage is excessively slow.The two cannot be realized to input port
Effective protection.
The content of the invention
The technical problem that the present invention is solved is, when surge voltage is detected, how to realize to the quick of input port
Earial drainage, more effectively protects to provide input port.
To solve above-mentioned technical problem, the embodiment of the present invention provides a kind of surge protection circuit, is coupled to input port, institute
Stating surge protection circuit includes：Detection circuit, is adapted to detect for the input voltage that the input port is received, when the input voltage
During more than clamp voltage, the output end of the detection circuit produces the first conducting voltage；Voltage amplifier circuit, receives described first
Conducting voltage, is suitable to be amplified to obtain the second conducting voltage, and via the voltage amplification first conducting voltage
The output end output of circuit；Surge bleeder circuit, receives second conducting voltage, when second conducting voltage is more than default
During value, the surge bleeder circuit carries out earial drainage to the input port, wherein, second conducting voltage is bigger, the wave
The speed for gushing bleeder circuit to the input port earial drainage is faster.
Alternatively, the voltage amplifier circuit includes：Commonsource amplifier, its first input end receives first conducting
Voltage, its second input couples the input port, and its output end exports the first conducting electric current；First resistor, receives described
First conducting electric current, is suitable to that second electric conduction is produced between its first end and the second end according to first conducting electric current
Pressure.
Alternatively, the commonsource amplifier includes：PMOS, the grid of the PMOS couples the common source and amplifies
The first input end of device, the source electrode of the PMOS and substrate couple the second input of the commonsource amplifier, described
The output end of the drain electrode coupling commonsource amplifier of PMOS.
Alternatively, the detection circuit includes：Mu balanced circuit and second resistance；Wherein, the output end of the mu balanced circuit
The input port is coupled to via the second resistance, the output end of the mu balanced circuit detects the input voltage, works as institute
When stating input voltage more than the clamp voltage, the output end of the mu balanced circuit exports the second conducting electric current；Described second is electric
Resistance is suitable to that first conducting voltage is produced between its first end and the second end according to second conducting electric current.
Alternatively, when the input voltage is more than the clamp voltage, the electricity of the output end output of the mu balanced circuit
Pressure is equal to the clamp voltage, and remains unchanged.
Alternatively, the mu balanced circuit includes the first voltage-stabiliser tube of one or more series connection.
Alternatively, the surge bleeder circuit includes：Transistor, its output end couples the input port, its control end
Second conducting voltage is received and input between, the transistor is when second conducting voltage is more than its threshold voltage
Conducting, and earial drainage is carried out to the input port to its input via its output end.
Alternatively, the transistor be NMOS tube, the input end grounding of the transistor.
Alternatively, the surge bleeder circuit also includes：Second voltage-stabiliser tube, its negative pole couples the control of the transistor
End, its positive pole couples the input of the transistor.
To solve above-mentioned technical problem, the embodiment of the present invention also provides a kind of electronic equipment, including the input port and
The surge protection circuit.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that：
The embodiment of the present invention provides a kind of surge protection circuit, is coupled to input port, and the surge protection circuit includes：
Detection circuit, is adapted to detect for the input voltage that the input port is received, described when the input voltage exceedes clamp voltage
The output end of detection circuit produces the first conducting voltage；Voltage amplifier circuit, receives first conducting voltage, is suitable to described
First conducting voltage is amplified to obtain the second conducting voltage, and the output end via the voltage amplifier circuit is exported；Wave
Bleeder circuit is gushed, second conducting voltage is received, when second conducting voltage is more than preset value, the surge earial drainage electricity
Road carries out earial drainage to the input port, wherein, second conducting voltage is bigger, and the surge bleeder circuit is to the input
The speed of port earial drainage is faster.When the present embodiment detection electric circuit inspection has been likely to occur surge voltage on the input port,
The first conducting voltage can reasonably be amplified using the voltage amplifier circuit, to obtain surge bleeder circuit is controlled
The second conducting voltage.Because the second conducting voltage is obtained through voltage amplification, therefore the surge bleeder circuit is to institute
The speed for stating input port earial drainage is accelerated.
Furthermore, in the present embodiment, when the input voltage exceedes the clamp voltage, namely in input
When being likely to occur surge voltage on mouthful, the response speed of the surge protection circuit depends on the PMOS in commonsource amplifier
Opening speed and surge bleeder circuit in transistor opening speed sum.Compared to patent document
The technical scheme of US20150303678A1, the present embodiment surge protection circuit when responding to surge voltage, after electricity
Circuit component is less, to the response speed of surge voltage faster, surge voltage can be suppressed in the very first time, more efficient
The ground protection input port.
Description of the drawings
Fig. 1 is a kind of circuit diagram of surge protection circuit of the prior art.
Fig. 2 is the circuit diagram of another kind of surge protection circuit of the prior art.
Fig. 3 is a kind of schematic block diagram of surge protection circuit of the embodiment of the present invention.
Fig. 4 is a kind of circuit diagram of surge protection circuit of the embodiment of the present invention.
Fig. 5 is the working signal waveform diagram of embodiment of the present invention surge protection circuit.
Specific embodiment
As described in the background section, the surge protection when surge voltage occurs in input port, with input port coupling
Circuit needs rapidly to detect surge voltage, and quickly carries out earial drainage to the input port, to realize having input port
Effect protection.However, in prior art, patent document US20140233139A1 and US20150303678A1 propose respectively one kind
Surge protection circuit, the two validity to input port protection needs improvement badly.
Present inventor is analyzed above two scheme of the prior art.
With reference to Fig. 1, Fig. 1 shows the surge protection circuit 100 in patent document US20140233139A1.Detecting
Voltage on input port PAD exceedes the equivalent breakdown reverse voltage of mu balanced circuit Z1 (including the voltage-stabiliser tube of multiple series connection),
Namely when on input port PAD there is surge voltage, occur the electric current that mu balanced circuit Z1 causes on resistance R1.In general,
This electric current is microampere to milliampere level.When the voltage at resistance R1 two ends is coupled between the grid source of transistor 202A and more than transistor
During the threshold voltage vt h of 202A, transistor 202A turns on and produces channel current, and the generation of the channel current causes the crystalline substance
Body pipe 202A can carry out earial drainage to the input port PAD to ground port GND (or substrate port SUBSTRATE), to reduce
The surge voltage.Because mu balanced circuit Z1 is after anti-phase puncturing, the voltage stabilization at its two ends (namely is equal in its clamp voltage
Its equivalent breakdown reverse voltage), therefore, now the voltage Vgs between the source electrode and grid of transistor 202A is equal to resistance R1
The pressure reduction at two ends, namely equal to the voltage on the input port PAD and the difference of the clamp voltage of the mu balanced circuit Z1, certainly will
So that when the mu balanced circuit Z1 has just been inverted and has punctured, the transistor 202A is not fully opened, namely its channel current
Value it is less, it is slower to the earial drainage speed of the input port PAD.Although as the increasing of the voltage on the input port PAD
Plus, the transistor 202A starts fully unlatching, however, it is possible to mean that surge voltage now is very high, by serious shadow
Ring the validity to input port PAD protections.Although surge protection circuit 100 can by resistance by R1 arrange compared with
Greatly, it is not optimal case for circuit area and power consumption.
With reference to Fig. 2, Fig. 2 shows the surge protection circuit 204 in patent document US20150303678A1.The surge
Protection circuit 204 at least includes mu balanced circuit 206 and detection bleeder circuit 208.Voltage on input port 203 is detected
VsourceMore than the equivalent breakdown reverse voltage of the mu balanced circuit 206 (including the voltage-stabiliser tube 302 of multiple series connection), Ye Ji
When there is surge voltage on input port 203, there is electric current on resistance R1.In general, the electric current on resistance R1 be microampere extremely
Milliampere level.PMOS current mirrors 304 carry out mirror image to above-mentioned electric current, then by the function of current obtained after mirror image in resistance R2, by
The voltage signal that resistance R2 is produced is input into source follower 306, the current signal being input into by the source follower 306 Jing again
Voltage signal is converted into by resistance R3 to be input into the grid of transistor 308.When the voltage at resistance R3 two ends is coupled to the crystal
Between the grid source of pipe 308 and more than the transistor 308 threshold voltage vt h when, the transistor 308 turns on and produces raceway groove
Electric current, the generation of the channel current allows the transistor 308 to the input port 203 to the (ground terminal of ground port 210
Voltage on mouth 210 is Vground) earial drainage is carried out, to reduce the surge voltage.Voltage-stabiliser tube 301 is suitable to the transistor 308
Source electrode and grid between voltage carry out clamper, to protect transistor 308.When there is surge voltage on input port 203,
Response of the detection bleeder circuit 208 to surge voltage is not rapid enough, and specifically, its response speed depends on PMOS current mirrors
The opening speed sum of 304 speed, the speed of source follower 306 and transistor 308, may cause the input port
Voltage V on 203sourceLarger, detection bleeder circuit 208 just starts to carry out earial drainage to the input port 203, seriously
Have impact on the validity to the protection of input port 203.Further, although the setting of the source follower 306 can be reduced
Impact of the parasitic capacitance on the grid of transistor 308 to circuit, but the source follower 306 is optional, such as at it
Source follower 306 can also be omitted in his embodiment.For example, present inventor to surge protection circuit 204 by carrying out
The simulation result that emulation is obtained shows that the scheme omitted after source follower 306 is also acceptable.
For techniques discussed above problem, the embodiment of the present invention proposes a kind of surge protection circuit, when detecting surge
During voltage, the quick earial drainage to input port can be realized, more efficiently provide protection to input port.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent from, below in conjunction with the accompanying drawings to this
The specific embodiment of invention is described in detail.
As shown in figure 3, Fig. 3 shows the surge protection circuit 300 of the embodiment of the present invention, the surge protection circuit 300
Its input port 301 protected can be coupled to.
In being embodied as, the input port 301 can be power port, or FPDP, the present embodiment
Do not carry out specifically limited.
In the present embodiment, the surge protection circuit 300 can include detection circuit 302, voltage amplifier circuit 303 and wave
Gush bleeder circuit 304.
Wherein, the detection circuit 302 is adapted to detect for the input voltage INPUT of the reception of the input port 301, when described
When input voltage INPUT exceedes clamp voltage, namely mean to be likely to occur surge voltage on the input port 301, this
When, the output end of the detection circuit 302 produces the first conducting voltage Vbreak1.Alternatively, first conducting voltage
The size of Vbreak1 can be equal to the difference of the input voltage INPUT and the clamp voltage.
It should be noted that the clamp voltage can be the electrical quantity via the circuit inside the detection circuit 302
Arrange, depending on the pressure situation of the input port 301.
The voltage amplifier circuit 303 receives first conducting voltage Vbreak1, is suitable to first conducting voltage
Vbreak1 is amplified to obtain the second conducting voltage Vbreak2, and defeated via the output end of the voltage amplifier circuit 303
Go out.
The surge bleeder circuit 304 receives second conducting voltage Vbreak2, when second conducting voltage
When Vbreak2 is more than preset value, 304 pairs of input ports 301 of the surge bleeder circuit carry out earial drainage, wherein, described the
Two conducting voltages Vbreak2 are bigger, and the speed of 304 pairs of earial drainages of the input port 301 of the surge bleeder circuit is faster.
In the present embodiment, due to second conducting voltage Vbreak2 it is bigger, described in the surge bleeder circuit 304 pairs
The speed of the earial drainage of input port 301 is faster.Therefore, it can by detecting the input voltage in the detection circuit 302
When INPUT exceedes clamp voltage, namely when meaning to be likely to occur surge voltage on the input port 301, using described
Voltage amplifier circuit 303 is reasonably amplified the first conducting voltage Vbreak1 that the detection circuit 302 is exported, with
To for controlling second conducting voltage Vbreak2 of surge bleeder circuit 304.Because the second conducting voltage is through voltage
Amplify what is obtained, therefore the surge bleeder circuit is accelerated to the speed of the input port earial drainage.In the present embodiment, one
Arrive after testing and be likely to occur surge voltage, you can set the speed of 304 pairs of earial drainages of the input port 301 of surge bleeder circuit
Put quickly, quick earial drainage means the rapid decrease of surge voltage.Compared to the surge protection circuit 100 shown in Fig. 1, this reality
Example is applied to the discharge capacity of input port faster, can realize more effectively protecting input port.
Fig. 4 is a kind of circuit diagram of surge protection circuit of the embodiment of the present invention.Below synthesis Fig. 3 and Fig. 4 is to the surge
The specific embodiment of protection circuit 300 is described in detail.
Used as a nonrestrictive example, in being embodied as, surge bleeder circuit 304 can include breadth length ratio (W/
L) larger transistor M2.
Furthermore, the output end of the transistor M2 couples the input port 301, the control of the transistor M2
Second conducting voltage Vbreak2 is received between end and input, the transistor is more than institute in second conducting voltage
Turn on when stating preset value, and earial drainage is carried out to the input port 301 to its input via its output end, it is described defeated to reduce
Surge voltage on inbound port 301.
It should be noted that the transistor M2 can be metal-oxide-semiconductor, can be further the NMOS tube in diagram, but
It is to be not limited to this, for example, the transistor M2 can also be triode.Preferably, the transistor M2 is larger-size
Power tube.
So that the transistor M2 is as NMOS tube as an example.When second conducting voltage Vbreak2 acts on the transistor
Between the grid and source electrode of M2, and second conducting voltage to exceed the transistor M2 threshold voltage vt h (namely described default
Value) when turning it on, channel current will be produced in the transistor M2, the channel current allows the transistor to institute
Stating input port 301 carries out earial drainage.
Transistor M2 works in saturation region, its produce channel current and the voltage Vgs between its grid and source electrode it is big
It is little to be directly proportional；More accurately, voltage Vgs of the channel current between the grid and source electrode of the transistor M2 increases
When, increased in the way of square law, for example, 2 times of voltage Vgs growths between the grid and source electrode of the transistor M2 are described
Channel current increases by 4 times.And the channel current in the transistor M2 is bigger, its earial drainage speed to the input port 301
It is faster.Also imply that, in the moment for detecting surge voltage, larger second conducting voltage Vbreak2 acts on institute
State between the grid and source electrode of transistor M2, the channel current in the transistor M2 can be caused to increase suddenly, can be in transistor
In the reasonable limit that M2 can bear, released the surge energy on the input port 301 with most fast speed.
Furthermore, it is typically that the larger of the size setting of the transistor M2, namely its breadth length ratio is larger so that institute
State the maximum current value that transistor M2 can bear larger, can be improved to input port by reasonably increasing its breadth length ratio
301 earial drainage speed, improves the rejection ability to surge.
In being embodied as, the input (namely its source electrode) of the transistor M2 can be grounded GND so that the input
Port 301 directly can form current path via the transistor M2 with ground GND.But this is not limited to, the present embodiment is not limited
Fixed drain passageways of the transistor M2 to the input port 301.
Preferably, the surge bleeder circuit 304 can also include：Second voltage-stabiliser tube Z2, its negative pole couples the crystal
The control end of pipe M2, its positive pole couples the input of the transistor M2.When the transistor M2 is metal-oxide-semiconductor, described second
Voltage-stabiliser tube Z2 is used for its grid of clamper and source voltage, prevents transistor M2 from grid oxygen occurring and punctures.
The second voltage-stabiliser tube Z2 can be Zener diode (Zener Diode), or transient state suppresses
(Transient Voltage Suppressor, TVS) diode, but not limited to this.
With continued reference to Fig. 4, in being embodied as, the voltage amplifier circuit 303 can include commonsource amplifier (in figure
Do not indicate) and first resistor R1.Wherein, the first input end of the commonsource amplifier receives first conducting voltage
Vbreak1, the second input of the commonsource amplifier couples the input port 301, and its output end output first is turned on
Electric current (is not indicated) in figure；First resistor R1 receives first conducting electric current, is suitable to according to first conducting electric current
Second conducting voltage Vbreak2 is produced between the first end of first resistor R1 and the second end.
Furthermore, the commonsource amplifier can include but is not limited to PMOS M1, the grid of PMOS M1
Pole couples the first input end of the commonsource amplifier, and the source electrode of PMOS M1 and substrate couple the common source and amplify
Second input of device, the output end of the drain electrode coupling commonsource amplifier of the PMOS.
First conducting voltage Vbreak1 can be converted into first conducting electric current by the commonsource amplifier,
And in rational scope, the two size is directly proportional.By the breadth length ratio to PMOS M1 and first resistor R1
The setting of resistance, the moment that can occur surge voltage on the input port 301, as long as first conducting voltage
Vbreak1 reaches the threshold voltage of PMOS M1 and is allowed to open, then the commonsource amplifier generates larger described first and leads
Galvanization, via the effect of first resistor R1, obtaining larger second conducting voltage Vbreak2 (can reach 5V
Even more high) fully opening the transistor M2.Second conducting voltage Vbreak2.
It should be noted that the voltage amplifier circuit 303 is only by taking above-mentioned commonsource amplifier and first resistor R1 as an example,
But it is not limited thereto.The voltage amplifier circuit 303 can be conventional voltage amplifier circuit.Specifically, the voltage is put
One kind of voltage controlled current circuit, stream control current circuit, voltage-controlled potential circuit and stream control potential circuit can be included in big circuit 303
Or it is various.
With continued reference to Fig. 4, in being embodied as, the detection circuit 302 can include：Mu balanced circuit Z1 and second resistance
R2；Wherein, the output end of the mu balanced circuit Z1 is coupled to the input port 301 via second resistance R2, described steady
The output end of volt circuit Z1 detects the input voltage INPUT, when the input voltage INPUT exceedes the clamp voltage,
The output end of the mu balanced circuit Z1 exports the second conducting electric current (not indicating in figure, generally 10uA to 10mA)；Described second
Resistance R2 is suitable to that first conducting voltage is produced between its first end and the second end according to second conducting electric current
Vbreak1。
Wherein, the mu balanced circuit Z1 can include but is not limited to the voltage-stabiliser tube of one or more series connection.The clamper
Voltage is equal to the voltage stabilizing value sum of the voltage-stabiliser tube of one or more series connection in the mu balanced circuit Z1.Specifically, the voltage stabilizing
Each voltage-stabiliser tube positive pole and negative pole in circuit Z1 is end to end, and the negative pole of first voltage-stabiliser tube couples the second resistance
R2；Alternatively, the positive pole of last voltage-stabiliser tube can couple the reference edge of the input port 301, such as described reference edge
Can be ground GND.
When the input voltage INPUT is more than the clamp voltage, the electricity of the output end output of the mu balanced circuit Z1
Pressure is equal to the clamp voltage, and remains unchanged.
In being embodied as, wrap in the voltage stabilizing value of the voltage-stabiliser tube in the mu balanced circuit Z1, and the mu balanced circuit Z1
The quantity of the voltage-stabiliser tube for including also determines the input on the input port 301 while determine the clamp voltage simultaneously
When voltage INPUT is higher than how degree, the surge bleeder circuit 304 starts to carry out the input port 301 earial drainage, reduces
Its surge voltage.The size of the clamp voltage depends on the maximum voltage endurance capability of the input port 301.
In the present embodiment, when the input voltage INPUT exceedes the clamp voltage, namely in input port 301
On when being likely to occur surge voltage, the response speed of the surge protection circuit 300 depend on the opening speed of PMOS M1 and
The opening speed sum of transistor M2.Compared to (the reference of surge protection circuit 204 in patent document US20150303678A1
Fig. 2), the present embodiment surge protection circuit 300 is to surge voltage when responding, after component it is less, to surge
The response speed of voltage faster, can suppress in the very first time to surge voltage, more efficiently protect the input
Mouth 301.
It is described when the input port 301 does not couple the surge protection circuit 300 in the present embodiment with reference to Fig. 5
It is coupled on input port 301 after surge voltage, the waveform of the input voltage INPUT is too high surge electricity shown in dotted line
Pressure may damage the circuit devcie for having coupled relation with the input port 301.
And it is coupled with the input port 301 of the present embodiment surge protection circuit 300 after surge voltage is coupled into, it is described defeated
The waveform for entering voltage INPUT is shown in solid, when the input voltage INPUT exceedes clamp voltage (being expressed as Vclamp),
The surge protection circuit 300 starts surge energy of releasing, and the input voltage INPUT begins to decline.Therefore, the input electricity
Pressure INPUT only can rise by a small margin, and its maximum is equal to the clamp voltage Vclamp.
Additionally, the emulation and actual measurement of Jing present inventors, the present embodiment surge protection circuit 300 can meet IEC
Ω equivalent series resistance testing standards (being equal to GB GB/T 17626.5) of 61000-4-5 2.
The embodiment of the present invention is also disclosed a kind of electronic equipment, and the electronic equipment can include the He of the input port 301
The surge protection circuit 300.
In being embodied as, it is total that the electronic equipment can include but is not limited to mobile phone, panel computer, other general serials
Line (Universal Serial Bus, USB) interface equipment etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, without departing from this
In the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
The scope of restriction is defined.
Claims (10)
1. a kind of surge protection circuit, is coupled to input port, it is characterised in that include：
Detection circuit, is adapted to detect for the input voltage that the input port is received, when the input voltage exceedes clamp voltage,
The output end of the detection circuit produces the first conducting voltage；
Voltage amplifier circuit, receives first conducting voltage, is suitable to be amplified first conducting voltage obtain the
Two conducting voltages, and via the output end output of the voltage amplifier circuit；
Surge bleeder circuit, receives second conducting voltage, when second conducting voltage is more than preset value, the surge
Bleeder circuit carries out earial drainage to the input port, wherein, second conducting voltage is bigger, and the surge bleeder circuit is to institute
The speed for stating input port earial drainage is faster.
2. surge protection circuit according to claim 1, it is characterised in that the voltage amplifier circuit includes：
Commonsource amplifier, its first input end receives first conducting voltage, and its second input couples the input
Mouthful, its output end exports the first conducting electric current；
First resistor, receives first conducting electric current, is suitable to according to first conducting electric current at its first end and the second end
Between produce second conducting voltage.
3. surge protection circuit according to claim 2, it is characterised in that the commonsource amplifier includes：
PMOS, the grid of the PMOS couples the first input end of the commonsource amplifier, the source electrode of the PMOS
With the second input that substrate couples the commonsource amplifier, the drain electrode coupling commonsource amplifier of the PMOS
Output end.
4. surge protection circuit according to claim 1, it is characterised in that the detection circuit includes：Mu balanced circuit and
Second resistance；
Wherein, the output end of the mu balanced circuit is coupled to the input port, the mu balanced circuit via the second resistance
Output end detect the input voltage, when the input voltage exceedes the clamp voltage, the output of the mu balanced circuit
The second conducting electric current of end output；
The second resistance is suitable to described first is produced between its first end and the second end according to second conducting electric current to be led
Be powered pressure.
5. surge protection circuit according to claim 4, it is characterised in that when the input voltage is more than clamper electricity
During pressure, the voltage of the output end output of the mu balanced circuit is equal to the clamp voltage, and remains unchanged.
6. the surge protection circuit according to claim 4 or 5, it is characterised in that the mu balanced circuit include one or
First voltage-stabiliser tube of multiple series connection.
7. surge protection circuit according to claim 1, it is characterised in that the surge bleeder circuit includes：
Transistor, its output end couples the input port, and second conducting voltage is received between its control end and input,
The transistor is turned on when second conducting voltage is more than its threshold voltage, and via its output end to its input to institute
Stating input port carries out earial drainage.
8. surge protection circuit according to claim 7, it is characterised in that the transistor is NMOS tube, the crystal
The input end grounding of pipe.
9. surge protection circuit according to claim 7, it is characterised in that the surge bleeder circuit also includes：
Second voltage-stabiliser tube, its negative pole couples the control end of the transistor, and its positive pole couples the input of the transistor.
10. a kind of electronic equipment, it is characterised in that including the surge described in the input port and any one of claim 1 to 9
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611213586.5A CN106655137A (en) | 2016-12-23 | 2016-12-23 | Surge protection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611213586.5A CN106655137A (en) | 2016-12-23 | 2016-12-23 | Surge protection circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN106655137A true CN106655137A (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611213586.5A Pending CN106655137A (en) | 2016-12-23 | 2016-12-23 | Surge protection circuit and electronic equipment |
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| CN108054743A (en) * | 2017-12-22 | 2018-05-18 | 上海艾为电子技术股份有限公司 | A kind of load switch integrated circuit and electronic equipment |
| CN108321781A (en) * | 2018-04-17 | 2018-07-24 | 江苏卓胜微电子股份有限公司 | A kind of esd protection circuit and the integration module based on GaAs PHEMT techniques |
| CN109193606A (en) * | 2018-11-20 | 2019-01-11 | 上海艾为电子技术股份有限公司 | Surge protection circuit, system and equipment |
| CN109217278A (en) * | 2018-11-20 | 2019-01-15 | 上海艾为电子技术股份有限公司 | Surge protection circuit, system and equipment |
| CN109301807A (en) * | 2018-11-20 | 2019-02-01 | 上海艾为电子技术股份有限公司 | A kind of surge protection circuit, system and equipment |
| CN109361203A (en) * | 2018-12-26 | 2019-02-19 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109449911A (en) * | 2018-12-26 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109638798A (en) * | 2018-12-20 | 2019-04-16 | 上海艾为电子技术股份有限公司 | The protection circuit and switched charge circuit of switched charge chip |
| CN109995008A (en) * | 2018-07-23 | 2019-07-09 | 晶焱科技股份有限公司 | Active safeguard structure and its digital quantizer of surging of surging |
| CN111525529A (en) * | 2020-04-13 | 2020-08-11 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Strong electromagnetic pulse protection circuit and protection method |
| CN112240946A (en) * | 2020-10-30 | 2021-01-19 | 西安理工大学 | ESD and surge cooperative protection circuit with low trigger voltage |
| CN113541119A (en) * | 2021-09-14 | 2021-10-22 | 浙江地芯引力科技有限公司 | Surge protection circuit, chip and electronic equipment |
| CN115811034A (en) * | 2022-11-29 | 2023-03-17 | 深圳市微源半导体股份有限公司 | Novel two-stage surge protection circuit |
| CN116995906A (en) * | 2023-07-11 | 2023-11-03 | 江苏展芯半导体技术有限公司 | Peak voltage suppression circuit |
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| CN107482578A (en) * | 2017-09-26 | 2017-12-15 | 湖州积微电子科技有限公司 | Low-power consumption overvoltage is automatic to disconnect protection device and frequency converter |
| CN108054743A (en) * | 2017-12-22 | 2018-05-18 | 上海艾为电子技术股份有限公司 | A kind of load switch integrated circuit and electronic equipment |
| US10811874B2 (en) | 2017-12-22 | 2020-10-20 | Shanghai Awinic Technology Co., LTD | Load switch integrated circuit and electronic device |
| CN108321781A (en) * | 2018-04-17 | 2018-07-24 | 江苏卓胜微电子股份有限公司 | A kind of esd protection circuit and the integration module based on GaAs PHEMT techniques |
| CN109995008A (en) * | 2018-07-23 | 2019-07-09 | 晶焱科技股份有限公司 | Active safeguard structure and its digital quantizer of surging of surging |
| CN109995008B (en) * | 2018-07-23 | 2021-01-29 | 晶焱科技股份有限公司 | Active surge protection structure and surge digital converter thereof |
| CN109193606B (en) * | 2018-11-20 | 2024-03-01 | 上海艾为电子技术股份有限公司 | Surge protection circuit, circuit system and electronic equipment |
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| CN109217278A (en) * | 2018-11-20 | 2019-01-15 | 上海艾为电子技术股份有限公司 | Surge protection circuit, system and equipment |
| CN109301807B (en) * | 2018-11-20 | 2023-11-14 | 上海艾为电子技术股份有限公司 | Surge protection circuit, circuit system and electronic equipment |
| CN109193606A (en) * | 2018-11-20 | 2019-01-11 | 上海艾为电子技术股份有限公司 | Surge protection circuit, system and equipment |
| CN109217278B (en) * | 2018-11-20 | 2023-09-22 | 上海艾为电子技术股份有限公司 | Surge protection circuit, circuit system and electronic equipment |
| CN109638798A (en) * | 2018-12-20 | 2019-04-16 | 上海艾为电子技术股份有限公司 | The protection circuit and switched charge circuit of switched charge chip |
| CN109638798B (en) * | 2018-12-20 | 2024-02-09 | 上海艾为电子技术股份有限公司 | Protection circuit of switch charging chip and switch charging circuit |
| CN109449911A (en) * | 2018-12-26 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109361203A (en) * | 2018-12-26 | 2019-02-19 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109449911B (en) * | 2018-12-26 | 2023-11-28 | 上海艾为电子技术股份有限公司 | Protection circuit |
| CN109361203B (en) * | 2018-12-26 | 2023-11-21 | 上海艾为电子技术股份有限公司 | Protection circuit |
| CN111525529A (en) * | 2020-04-13 | 2020-08-11 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Strong electromagnetic pulse protection circuit and protection method |
| CN112240946A (en) * | 2020-10-30 | 2021-01-19 | 西安理工大学 | ESD and surge cooperative protection circuit with low trigger voltage |
| CN113541119A (en) * | 2021-09-14 | 2021-10-22 | 浙江地芯引力科技有限公司 | Surge protection circuit, chip and electronic equipment |
| CN115811034A (en) * | 2022-11-29 | 2023-03-17 | 深圳市微源半导体股份有限公司 | Novel two-stage surge protection circuit |
| CN116995906A (en) * | 2023-07-11 | 2023-11-03 | 江苏展芯半导体技术有限公司 | Peak voltage suppression circuit |
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Application publication date: 20170510 |
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