CN109217278A - Surge protection circuit, system and equipment - Google Patents
Surge protection circuit, system and equipment Download PDFInfo
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- CN109217278A CN109217278A CN201811382198.9A CN201811382198A CN109217278A CN 109217278 A CN109217278 A CN 109217278A CN 201811382198 A CN201811382198 A CN 201811382198A CN 109217278 A CN109217278 A CN 109217278A
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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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Abstract
This application provides a kind of surge protection circuit, system and equipment, including first detection unit, surge drain unit, second detection unit；First detection unit is connected with surge drain unit and second detection unit respectively；First detection unit exports the first conducting voltage when input voltage is more than clamp voltage, increases the first conducting voltage when controlling voltage and being more than control voltage threshold for receiving input voltage and control voltage；Surge drain unit carries out aerial drainage for receiving input voltage and the first conducting voltage, to input voltage, exports discharge current；Second detection unit obtains the detection electric current for having ratio relation with discharge current, and according to detection electric current output control voltage corresponding with detection electric current for receiving input voltage and the first conducting voltage.When controlling voltage higher than control voltage threshold, so that clamp voltage reduces, maximum input voltage is reduced, and the first conducting voltage of output increases, and reduces the maximum power that surge protection circuit is born.
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of surge protection circuits, system and equipment.
Background technique
Surge voltage is above the transient overvoltage of normal voltage, refers generally to the short time occurred in power grid as " wave "
High voltage caused by high current.The producing cause of surge voltage mainly has lightning stroke, the large-scale load on power grid to be switched on or switched off
Deng.Surge voltage is likely to result in the damage of computer and various hardware devices, the damage of power-supply device, electronic equipment operation not
Stable and aging accelerates.
In order to guarantee various hardware devices, electronic equipments safety reliability service, prolongs its service life, need various hard
Part equipment, electronic equipment port add surge protective device, release in time to surge voltage, various hardware avoided to set
Standby, electronic equipment by surge voltage destruction, to guarantee the safe and reliable operation of various hardware devices, electronic equipment.
In the prior art, usually pass through a surge pipe as surge electricity applied to the surge protection circuit in integrated chip
The leakage path of pressure, so that when the surge voltage on circuit input end mouth exceeds preset value, surge pipe conducting, to surge voltage
It releases, to realize the protection to circuit.The surge pipe is usually N-type metal-oxide semiconductor (MOS) (Negative
Channel-Metal-Oxide-Semiconductor, NMOS), but in the surge protection circuit of the prior art, NMOS tube is held
The maximum power received is larger, so that NMOS tube is easy to blow.
Summary of the invention
Based on above-mentioned the deficiencies in the prior art, the invention proposes a kind of surge protection circuits, reduce surge electricity to realize
The maximum power born in road.
To achieve the above object, it is proposed that scheme it is as follows:
First aspect present invention discloses a kind of surge protection circuit, comprising:
First detection unit, surge drain unit, second detection unit；The first detection unit respectively with the surge
Drain unit is connected with the second detection unit；
The first detection unit, for receiving input voltage and control voltage, when the input voltage is more than clamper electricity
When pressure, the first detection unit exports the first conducting voltage, when the control voltage is more than to control voltage threshold, described the
One detection unit increases first conducting voltage；
The surge drain unit, for receiving the first conducting of the input voltage and first detection unit output
Voltage, the surge drain unit carries out aerial drainage to the input voltage according to the input voltage and the first conducting voltage, defeated
Discharge current out；
The second detection unit, for receiving the first conducting of the input voltage and first detection unit output
Voltage, the second detection unit obtain having ratio with the discharge current according to the input voltage and the first conducting voltage
The detection electric current of relationship, and the control voltage corresponding with the detection electric current is exported according to the detection electric current.
Optionally, in above-mentioned surge protection circuit, the second detection unit, comprising:
One end of first resistor and first switch tube, the first resistor receives the input voltage, the first resistor
The other end be connected with the second end of the first switch tube；
The first end of the first switch tube is grounded, and the control terminal of the first switch tube receives first electric conduction
Pressure；Wherein, after the first switch tube is connected under the action of first conducting voltage, the first resistor and described first
The connection branch of switching tube obtains the detection electric current, and exports the control voltage.
Optionally, in above-mentioned surge protection circuit, the first detection unit, comprising:
Voltage regulator circuit, second resistance and second switch；
The input terminal of the voltage regulator circuit receives the input voltage, and the output end of the voltage regulator circuit passes through described second
Resistance eutral grounding, the voltage regulator circuit includes at least two concatenated first zener diodes, for generating the clamp voltage, institute
The first zener diode stated in voltage regulator circuit is reversely connected in the voltage regulator circuit；
The one end of the second resistance remotely is for exporting first conducting voltage；
At least one two pole of the first pressure stabilizing in the first end and second end of the second switch voltage regulator circuit in parallel
The control terminal of pipe, the second switch receives the control voltage.
Optionally, in above-mentioned surge protection circuit, the first detection unit, further includes: the second zener diode, institute
The anode for stating the second zener diode connects the control terminal of the second switch, the cathode connection of second zener diode
The first end of the second switch.
Optionally, in above-mentioned surge protection circuit, the surge drain unit, comprising:
The second end of third switching tube, the third switching tube receives the input voltage, the third switch controlled
End is for receiving first conducting voltage, the first end ground connection of the third switching tube.
Optionally, in above-mentioned surge protection circuit, the switching tube, comprising: transistor.
Second aspect of the present invention discloses a kind of circuit system, comprising:
Operating circuit, the input port of the operating circuit are used for for receiving input voltage, the operating circuit defeated
Enter when voltage is in normal voltage value and works；
Surge protection circuit as described in above-mentioned any one, the surge protection circuit receive the input voltage, use
In making the input voltage of the operating circuit be maintained at normal voltage value.
Third aspect present invention discloses a kind of electronic equipment, comprising:
Surge protection circuit as described in above-mentioned any one.
It can be seen from the above technical scheme that in surge protection circuit provided by the invention, when input voltage is more than pincers
When the voltage of position, first detection unit generates the first conducting voltage, so that having received the surge drain unit pair of the first conducting voltage
Input voltage carries out aerial drainage, exports discharge current.And second detection unit is when receiving the first conducting voltage, can export and aerial drainage
Electric current is at the detection electric current of ratio relation, and second detection unit is according to the corresponding control voltage of detection electric current output.First inspection
After survey unit receives control voltage, when controlling voltage higher than control voltage threshold, the first conducting voltage exported can be made
Increase, the discharge capacity of surge drain unit is enabled to enhance, clamp voltage reduces, and the maximum value of input voltage reduces, and further drops
The maximum power that low surge protection circuit is born, and the maximum input voltage duration shortens, and makes surge protection circuit more
Safety.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the circuit diagram of existing surge protection circuit；
Fig. 2 is the simulation result diagram of existing surge protection circuit；
Fig. 3 is a kind of structure chart of surge protection circuit disclosed in the embodiment of the present application；
Fig. 4 is a kind of circuit diagram of surge protection circuit disclosed in the embodiment of the present application；
Fig. 5 is a kind of simulation result diagram of surge protection circuit disclosed in the embodiment of the present application；
Fig. 6 is a kind of structure chart of circuit system disclosed in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Currently, the existing surge protection circuit applied to integrated circuit, as shown in Figure 1, including voltage regulator circuit 101, the
One resistance R1 and first switch tube M1.The input terminal of voltage regulator circuit receives input voltage VIN, and the output end of voltage regulator circuit 101 is logical
Cross first resistor R1 ground connection.The second end of first switch tube M1 receives input voltage VIN, the second termination of first switch tube M1
Ground, the output end of the control terminal connection voltage regulator circuit 101 of first switch tube M1.Wherein, voltage regulator circuit 101 includes multiple first steady
Diode Z1 is pressed, multiple first zener diode Z1 reversal connections are in circuit.First switch tube M1 can be NMOS tube, first switch
The first end of pipe M1 is source electrode, and control terminal is grid, and second end is drain.
When input voltage VIN is more than clamp voltage, that is, when there is surge voltage, voltage regulator circuit 101 is connected, output first
Conducting voltage V1.The control terminal of first switch tube M1 has received the first conducting voltage V1, when the first conducting voltage V1 is more than first
When the cut-in voltage of switching tube M1, first switch tube M1 conducting carries out aerial drainage to input voltage VIN.
Referring to Fig.2, the embodiment of the present application provides the simulation result of Fig. 1.When surge voltage is 100V, discharge current
The maximum value of IIN is 29.851A, and corresponding input voltage VIN is 38.296V.Therefore, according to rating formula: P=UI,
Obtaining the maximum transient power that switching tube is born in surge protection circuit is Pmax=29.851 × 38.296=1143.17W.Though
Surge voltage can be reduced to clamp voltage by right existing surge protection circuit, but the power that switching tube is born is very big, be held
Easy burn-out switching tube, therefore existing surge protection circuit and dangerous.
In view of the above-mentioned problems, the embodiment of the present application proposes a kind of surge protection circuit, surge protection electricity is reduced to realize
The maximum power born in road.
Refering to Fig. 3, the embodiment of the present application discloses a kind of surge protection circuit, comprising:
First detection unit 301, surge drain unit 302, second detection unit 303.First detection unit 301 respectively with
The surge drain unit 302 is connected with second detection unit 303.
First detection unit 301, for receiving input voltage and control voltage, when input voltage is more than clamp voltage,
First detection unit 301 exports the first conducting voltage.When controlling voltage is more than to control voltage threshold, first detection unit 301
Clamp voltage is reduced, the first conducting voltage is increased.Clamp voltage can artificially be set according to actual needs.
Optionally, referring to fig. 4, in another embodiment of the application, a kind of embodiment of first detection unit 401,
Include:
Voltage regulator circuit 404, second resistance R2 and second switch M2.
The input terminal of voltage regulator circuit 404 receives input voltage VIN, and the output end of voltage regulator circuit 404 passes through second resistance R2
Ground connection, voltage regulator circuit 404 includes at least two concatenated first zener diode Z1, for generating clamp voltage.Voltage regulator circuit
The first zener diode Z1 in 404 is reversely connected in voltage regulator circuit 404.
It should be noted that both ends generate breakdown reverse voltage, n the first pressure stabilizings two after the first zener diode Z1 conducting
Pole pipe Z1 is connected in voltage regulator circuit 404, and n times of breakdown reverse voltage is generated after conducting.N the first zener diode Z1 are generated
Clamp voltage, clamp voltage can be adjusted by the number for the first zener diode Z1 that connects.
The one end of second resistance R2 remotely is for exporting the first conducting voltage V1.
At least one first zener diode in the first end and second end shunt regulating circuit 404 of second switch M2
Z1.The number of first zener diode Z1 of second switch M2 parallel connection need to be less than two pole of the first pressure stabilizing in voltage regulator circuit 404
The sum of pipe Z1.The control terminal of second switch M2 receives control voltage V2.
Wherein, second switch M2 can be PMOS tube, and the first end of second switch M2 is source electrode, second switch M2
Control terminal be grid, the second end of second switch M2 is drain electrode.
It should be noted that the number of the first zener diode Z1 of second switch M2 parallel connection can according to actual needs and
It is fixed, and second switch M2 can any number of first zener diode Z1 in shunt regulating circuit 404, second switch M2 is simultaneously
Position where first zener diode Z1 of connection in voltage regulator circuit 404 has no effect on the realization of the embodiment of the present application.
When input voltage VIN is greater than clamp voltage, i.e. judgement has surge voltage appearance, at this time multiple first pressure stabilizing, two poles
Pipe Z1 conducting, second resistance R2 have electric current to flow through, therefore the one end of second resistance R2 remotely exports the first conducting voltage V1.If
Both end voltage is breakdown reverse voltage V when first zener diode Z1 is connectedBR, and two pole of the first pressure stabilizing in voltage regulator circuit 404
Pipe Z1 has N number of, then first conducting voltage V1=VIN-N × VBR.When the control of the second switch M2 in first detection unit 401
When termination receives control voltage V2, when control voltage V2 is more than control voltage threshold, second switch M2 closure, second switch
First zener diode Z1 M2 in parallel is shorted.If the first zener diode Z1 of second switch M2 parallel connection has n,
The value of first conducting voltage V1 is V1=VIN- (N-n) × VBR, therefore it is (N-n) × V that clamp voltage, which lowers,BR, the first electric conduction
V1 is pressed to increase.
Optionally, first detection unit 401 can also include: the second zener diode Z2.Second zener diode Z2's
The control terminal of anode connection second switch M2, the first end of the cathode connection second switch M2 of the second zener diode M2.
For protecting second switch M2, the voltage between second switch M2 first end and second end is more than second zener diode Z2
When the breakdown reverse voltage of the second zener diode Z2, the voltage at both ends is clamped in the reverse breakdown of the second zener diode M2
Voltage, therefore second switch M2 will not be damaged.
Surge drain unit 302, for receiving the first conducting voltage of input voltage and the output of first detection unit 301.
Surge drain unit 302 carries out aerial drainage to input voltage according to input voltage and the first conducting voltage, exports discharge current.
Optionally, referring to fig. 4, in another embodiment of the application, a kind of embodiment of surge drain unit 402,
It include: third switching tube M3.The second end of third switching tube M3 receives input voltage VIN, and third switching tube M3 control terminal is used for
Receive the first conducting voltage V1, the first end ground connection of third switching tube M3.Wherein, third switching tube M3 is NMOS tube, and third is opened
The first end for closing pipe M3 is source electrode, and second end is drain, and control terminal is grid.
It should be noted that the condition of third switching tube M3 closure are as follows: the gate-source voltage of third switching tube M3, i.e., first
When conducting voltage V1 reaches the cut-in voltage of third switching tube M3, third switching tube M3 closure.Branch where third switching tube M3
Obtain discharge current IIN.And by the size of current of third switching tube M3, the i.e. size of discharge current IIN, with third switching tube
Gate source voltage, i.e. the size of the first conducting voltage is related.The bigger V1 of first conducting voltage, flows through the aerial drainage of third switching tube M3
Electric current IIN is bigger.
Second detection unit 303, for receiving the first conducting voltage of input voltage and the output of first detection unit 301.
Second detection unit 303 obtains the detection electric current for having ratio relation with discharge current according to input voltage and the first conducting voltage,
And according to detection electric current output control voltage corresponding with detection electric current.
Optionally, refering to Fig. 4, in another embodiment of the application, second detection unit 403 may include: the first electricity
Hinder R1 and first switch tube M1.One end of first resistor R1 receives input voltage VIN, and the other end of first resistor R1 is opened with first
The second end for closing pipe M1 is connected.The first end of first switch tube M1 is grounded, and the control terminal of first switch tube M1 receives the first conducting
Voltage V1.Wherein, after first switch tube M1 is connected under the action of the first conducting voltage V1, first resistor R1 and first switch tube
The connection branch of M1 obtains detection electric current Isns, and detection electric current Isns flows through first resistor R1, and first resistor R1 is far from input electricity
Press one end output control voltage V2 of VIN.Wherein, first switch tube M1 can be NMOS tube, and first end is source electrode, and second end is
Drain, control terminal are grid.
It should be noted that detection electric current Isns and discharge current IIN has ratio relation.And it detects electric current Isns and lets out
The ratio of galvanic electricity stream IIN are as follows: the first switch tube M1 in second detection unit 403 is opened with the third in surge drain unit 402
Close the ratio of the breadth length ratio of pipe M3.
Optionally, referring to fig. 4, discharge current IIN can taking human as one discharge current preset value of setting, work as discharge current
It has been more than control voltage threshold according to the detection electric current Isns control voltage V2 generated when IIN is more than discharge current preset value.Its
In, detection electric current Isns and discharge current IIN have ratio relation.The second switch M2 in first detection unit 401 is led at this time
Logical, the first zener diode Z1 of second switch M2 parallel connection is shorted, and the first conducting voltage V1 increases.Wherein, described to let out
The ratio of galvanic electricity stream IIN and detection electric current Isns are first switch tube M1 and surge drain unit in second detection unit 403
The ratio of the breadth length ratio of third switching tube M3 in 402.
When control voltage V2 reaches control voltage threshold, the grid source of the second switch M2 in first detection unit 401
Voltage difference has reached cut-in voltage Vth-M2.When the ratio of the breadth length ratio and the breadth length ratio of third switching tube M3 of first switch tube M1 is
When 1:k, the ratio of detection electric current Isns and discharge current IIN are also 1:K.Therefore, discharge current preset value can be derived are as follows:It can thus be seen that discharge current preset value is related with the resistance value of ratio K and first resistor R1, can pass through
Setting ratio K and the resistance value of first resistor R1 set discharge current preset value, when to reach discharge current pre- by discharge current IIN
If when value, control voltage V2 has also reached control voltage threshold, i.e. the grid source electrode of second switch M2 reaches cut-in voltage Vth-M2,
Second switch M2 conducting, the first conducting voltage V1 increase, and discharge current IIN increases.
Optionally, in another embodiment of the application, the switching tube in surge protection circuit can be transistor, can also
To be other other kinds of switching tubes with transistor function.
In surge protection circuit provided by the invention, when input voltage is more than clamp voltage, first detection unit 301 is produced
Raw first conducting voltage, so that the surge drain unit 302 for having received the first conducting voltage carries out aerial drainage, output to input voltage
Discharge current.And second detection unit 303 is when receiving the first conducting voltage, can export and discharge current at ratio relation inspection
Electric current is surveyed, second detection unit 303 exports corresponding control voltage according to detection electric current.First detection unit 301 receives
After controlling voltage, when controlling voltage higher than control voltage threshold, the first conducting voltage of output can be made to increase, surge is enabled to let out
The discharge capacity enhancing of unit 302 is flowed, clamp voltage reduces, and the maximum value of input voltage reduces, and further reduced surge guarantor
The maximum power that protection circuit is born, and the maximum input voltage duration shortens, and keeps surge protection circuit safer.
Refering to Fig. 5, when surge voltage is 100V, maximum discharge current IIN is 34.974A, and input voltage VIN is at this time
28.254V.According to rating formula P=UI, maximum transient power Pmax=34.974 × 28.254=988.16W.Comparison diagram
Maximum transient power 1143.17W in 2, it can be seen that the maximum transient power decline that surge protection circuit is born.And in Fig. 2
First conducting voltage is 3.4375V, and the first conducting voltage in Fig. 5 is 3.88V, it can be seen that the embodiment of the present application compares existing skill
Surge protection circuit in art, the first conducting voltage increased, the discharge capacity enhancing of surge bleeder circuit.Moreover, comparison
The input voltage maximum value in input voltage maximum value 38.296V and Fig. 5 in Fig. 2 is 37.0532V, it is known that the maximum in Fig. 5
Input voltage reduces about 1.2V compared with the maximum input voltage in Fig. 2, and maximum input voltage duration is also significantly short in Fig. 5
The maximum input voltage duration in Fig. 2, the reduction and the shortening of maximum input voltage duration of maximum input voltage,
The time that the voltage for bearing entire circuit was lower and bore high pressure shortens, and circuit operation is allowed to become more safe and reliable.
Refering to Fig. 6, the embodiment of the present application discloses a kind of circuit system, comprising: operating circuit 601 and surge protection circuit
602。
The input port of operating circuit 601 is used at input voltage for receiving input voltage VIN, operating circuit 601
It works when normal voltage value.The work that operating circuit 601 carries out can be as power supply for electrical equipment, be also possible to run
The action of program etc., the operating circuit 601 does not influence the realization of the embodiment of the present application.
Surge protection circuit 602 receives input voltage VIN, for being maintained at the input voltage VIN of operating circuit 601 just
Normal voltage value.Wherein, the specific implementation process Yu realization principle of surge protection circuit 602 and the surge shown in above-described embodiment are protected
Protection circuit is consistent, reference can be made to, which is not described herein again.
The embodiment of the present application discloses a kind of electronic equipment, including surge protection circuit.Wherein, the surge protection circuit
Specific implementation process it is consistent with the surge protection circuit shown in realization principle and above-described embodiment, reference can be made to, it is no longer superfluous here
It states.
In specific implementation, it is total to can include but is not limited to mobile phone, tablet computer, other general serials for the electronic equipment
Line (Universal Serial Bus, USB) interface equipment etc..
Professional technician can be realized or using the present invention.Profession of the various modifications to these embodiments to this field
It will be apparent for technical staff, the general principles defined herein can not depart from spirit or model of the invention
In the case where enclosing, realize in other embodiments.Therefore, the present invention will not be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with the principles and novel features disclosed herein.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (8)
1. a kind of surge protection circuit characterized by comprising
First detection unit, surge drain unit, second detection unit；The first detection unit respectively with the surge aerial drainage
Unit is connected with the second detection unit；
The first detection unit, for receiving input voltage and control voltage, when the input voltage is more than clamp voltage,
The first detection unit exports the first conducting voltage, when the control voltage is more than control voltage threshold, first inspection
It surveys unit and increases first conducting voltage；
The surge drain unit, for receiving the first electric conduction of the input voltage and first detection unit output
Pressure, the surge drain unit carry out aerial drainage, output to the input voltage according to the input voltage and the first conducting voltage
Discharge current；
The second detection unit, for receiving the first electric conduction of the input voltage and first detection unit output
Pressure, the second detection unit obtain having ratio pass with the discharge current according to the input voltage and the first conducting voltage
The detection electric current of system, and the control voltage corresponding with the detection electric current is exported according to the detection electric current.
2. circuit according to claim 1, which is characterized in that the second detection unit, comprising:
First resistor and first switch tube, one end of the first resistor receive the input voltage, the first resistor it is another
One end is connected with the second end of the first switch tube；
The first end of the first switch tube is grounded, and the control terminal of the first switch tube receives first conducting voltage；Its
In, after the first switch tube is connected under the action of first conducting voltage, the first resistor and the first switch
The connection branch of pipe obtains the detection electric current, and exports the control voltage.
3. circuit according to claim 1, which is characterized in that the first detection unit, comprising:
Voltage regulator circuit, second resistance and second switch；
The input terminal of the voltage regulator circuit receives the input voltage, and the output end of the voltage regulator circuit passes through the second resistance
Ground connection, the voltage regulator circuit include at least two concatenated first zener diodes, described steady for generating the clamp voltage
The first zener diode in volt circuit is reversely connected in the voltage regulator circuit；
The one end of the second resistance remotely is for exporting first conducting voltage；
At least one first zener diode in the first end and second end of the second switch voltage regulator circuit in parallel, institute
The control terminal for stating second switch receives the control voltage.
4. circuit according to claim 3, which is characterized in that the first detection unit, further includes: two pole of the second pressure stabilizing
Pipe, the anode of second zener diode connect the control terminal of the second switch, and second zener diode is born
Pole connects the first end of the second switch.
5. circuit according to claim 1, which is characterized in that the surge drain unit, comprising:
Third switching tube, the second end of the third switching tube receive the input voltage, and third switch controlled end is used
In receiving first conducting voltage, the first end of the third switching tube is grounded.
6. circuit as claimed in any of claims 2 to 5, which is characterized in that the switching tube, comprising: transistor.
7. a kind of circuit system characterized by comprising
Operating circuit, the input port of the operating circuit are used for for receiving input voltage, the operating circuit in input electricity
It works when pressure is in normal voltage value；
Surge protection circuit as described in any one of claim 1 to 6, the surge protection circuit receive the input electricity
Pressure, for making the input voltage of the operating circuit be maintained at normal voltage value.
8. a kind of electronic equipment characterized by comprising
Surge protection circuit as described in any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811382198.9A CN109217278B (en) | 2018-11-20 | 2018-11-20 | Surge protection circuit, circuit system and electronic equipment |
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| CN201811382198.9A CN109217278B (en) | 2018-11-20 | 2018-11-20 | Surge protection circuit, circuit system and electronic equipment |
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| CN109217278A true CN109217278A (en) | 2019-01-15 |
| CN109217278B CN109217278B (en) | 2023-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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