CN109193606A - Surge protection circuit, system and equipment - Google Patents
Surge protection circuit, system and equipment Download PDFInfo
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- CN109193606A CN109193606A CN201811382183.2A CN201811382183A CN109193606A CN 109193606 A CN109193606 A CN 109193606A CN 201811382183 A CN201811382183 A CN 201811382183A CN 109193606 A CN109193606 A CN 109193606A
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- 238000010586 diagram Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
This application provides a kind of surge protection circuit, system and equipment, including first detection unit, second detection unit, surge drain unit；First detection unit is connected with second detection unit and surge drain unit respectively；First detection unit, when input voltage is more than clamp voltage, exports the first conducting voltage and the first conducting electric current for receiving input voltage and control voltage, when controlling voltage greater than control voltage threshold, increases the first conducting voltage and the first conducting electric current；Second detection unit is for receiving input voltage and the first conducting electric current, second detection unit is according to input voltage and the first conducting electric current, the detection electric current for having ratio with the first conducting electric current is obtained, and according to detection electric current output control voltage corresponding with detection electric current；Surge drain unit is used to receive the first conducting voltage of input voltage and first detection unit output, and surge drain unit carries out aerial drainage to input voltage according to input voltage and the first conducting voltage, exports discharge current.
Description
Technical field
The present invention relates to technical field of integrated circuits, and in particular to a kind of surge protection circuit, 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 circuit and systems, are reduced with realizing
The maximum power born in surge circuit.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
First aspect present invention discloses a kind of surge protection circuit, comprising:
First detection unit, second detection unit, surge drain unit；Wherein, the first detection unit respectively with institute
Second detection unit is stated to be connected with the surge drain 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 and the first conducting electric current；When the control voltage is greater than control electricity
When pressing threshold value, the first detection unit increases first conducting voltage and the first conducting electric current；
The second detection unit, for receiving the first electric conduction of the input voltage and the first detection unit
Stream, the second detection unit obtain having ratio with first conducting electric current according to the input voltage and the first conducting electric current
The detection electric current of value, and the control voltage corresponding with the detection electric current is exported according to the detection electric current；
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.
Optionally, in above-mentioned surge protection circuit, the first detection unit, comprising:
Voltage regulator circuit, third switching tube and second resistance；
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, and the one of the second resistance ground connection
End is for exporting first conducting electric current；
At least one two pole of the first pressure stabilizing in the first end and second end of the third switching tube voltage regulator circuit in parallel
The control terminal of pipe, the third switching tube receives the control voltage.
Optionally, in above-mentioned surge protection circuit, the first detection unit further include: 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 4th switching tube, the 4th switching tube receives the input voltage, the control of the 4th switching tube
End processed is for receiving first conducting voltage, the first end ground connection of the 4th 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 and the first conducting electric current, so that having received the first conducting voltage
Surge drain unit carries out aerial drainage to input voltage, exports discharge current；And second detection unit receives the first conducting electric current
When, the detection electric current with the first conducting electric current at ratio relation can be exported, second detection unit is according to detection electric current output phase pair
The control voltage answered；After first detection unit receives control voltage, when controlling voltage higher than control voltage threshold, it can make
First conducting voltage of output increases, and the discharge capacity of surge protection unit is enabled to enhance, and clamp voltage reduces, and input voltage is maximum
Value reduces, and further reduced the maximum power of surge protection circuit receiving, and the maximum input voltage duration shortens, and makes wave
It is safer to gush protection circuit.
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, the output end of voltage regulator circuit 101
It is grounded by first resistor R1.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 electrode.
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, second detection unit 302, surge drain unit 303.Wherein, the first detection unit
301 are connected with the second detection unit 302 and the surge drain unit 303 respectively.
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 and the first conducting electric current.When controlling voltage greater than control voltage threshold, the
One detection unit 301 reduces clamp voltage, increases the first conducting voltage and the first conducting electric current.Clamp voltage can be according to practical need
It asks for help to be set.
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, third switching tube M3 and second resistance R2.
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
It is grounded GND, voltage regulator circuit 404 includes at least two concatenated first zener diode Z1, for generating clamp voltage.Pressure stabilizing electricity
The first zener diode Z1 in road 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 used for for exporting the first conducting voltage V1, one end of second resistance R2 ground connection
Export the first conducting electric current Ib.
At least one first zener diode in the first end and second end shunt regulating circuit 404 of third switching tube M3
Z1.The number of first zener diode Z1 of third switching tube M3 parallel connection must be less than two pole of the first pressure stabilizing in voltage regulator circuit 404
The sum of pipe Z1.The control terminal of third switching tube M3 receives control voltage V2.
Wherein, third switching tube M3 can be PMOS tube, and the first end of third switching tube M3 is source electrode, third switching tube M3
Control terminal be grid, the second end of third switching tube M3 is drain electrode.
It should be noted that the number of the first zener diode Z1 of third switching tube M3 parallel connection can according to actual needs and
It is fixed, and third switching tube M3 can any number of first zener diode Z1 in shunt regulating circuit 404, third switching tube M3 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, the
One end that two resistance R2 are grounded GND exports the first conducting electric current Ib.If both end voltage is anti-when the first zener diode Z1 is connected
To breakdown voltage VBR, and the first zener diode Z1 in voltage regulator circuit 404 have it is N number of, then the first conducting voltage V1=VIN-N ×
VBR.When the control terminal of the third switching tube M3 in first detection unit 401 receives control voltage V2, control voltage V2 is more than
When controlling voltage threshold, third switching tube M3 conducting, the first zener diode Z1 third switching tube M3 in parallel is shorted.If
First zener diode Z1 of third switching tube M3 parallel connection has n, then the value of the first conducting voltage V1 be V1=VIN- (N-n) ×
VBR, therefore it is (N-n) × V that clamp voltage, which lowers,BR, the first conducting voltage V1 increases, correspondingly, being generated by first resistor R1
The first conducting electric current Ib also 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 third switching tube M3, the first end of the cathode connection third switching tube M3 of the second zener diode Z2.
For protecting third switching tube M3, the voltage between third switching tube M3 first end and control terminal 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 Z2
Voltage, therefore third switching tube M3 will not be damaged.
Second detection unit 302, for receiving the first conducting electric current of input voltage and the output of first detection unit 301,
Second detection unit 302 obtains having ratio with first conducting electric current according to the input voltage and the first conducting electric current
Electric current is detected, and exports the control voltage corresponding with the detection electric current according to the detection electric current；
Optionally, refering to Fig. 4, in another embodiment of the application, second detection unit 402 may include: first to open
Close pipe M1 and second switch M2 and first resistor R1.The control terminal of first switch tube M1 is opened with its second end and second respectively
The control terminal for closing pipe M2 is connected, and the first end of first switch tube M1 is grounded GND, and the second end of first switch tube M1 is for receiving the
One conducting electric current Ib；The second end of second switch M2 is connected with first resistor R1, and first end is grounded GND；First resistor R1's
The other end receives input voltage VIN；Wherein, first switch tube M1 and second switch M2 are under the action of the first conducting electric current Ib
After conducting, the connection branch of second switch M2 obtains detection electric current Isns, and detection electric current Isns flows through first resistor R1, and first
One end output control voltage V2 of the resistance R1 far from input voltage VIN.Wherein, first switch tube M1 and second switch M2 can be with
For NMOS tube, their first end is source electrode, and second end is drain electrode, and control terminal is grid.
It should be noted that detection electric current Isns and the first conducting electric current Ib has ratio relation.And detect electric current Isns
With the ratio of the first conducting electric current Ib are as follows: the width of first switch tube M1 and second switch M2 in second detection unit 402 are long
The ratio of ratio.
Optionally, referring to fig. 4, the first conducting electric current Ib can taking human as one the first conducting electric current preset value Ib of settingth,
When the first conducting electric current Ib is more than the first conducting electric current preset value IbthWhen, the control voltage generated according to detection electric current is more than
Control voltage threshold.Wherein, detection electric current Isns and the first conducting electric current Isns has ratio relation.Second detection unit at this time
First switch tube M1 and second switch M2 in 402 are connected, third switching tube M3 is in parallel in first detection unit 401 first
Zener diode Z1 is shorted, and the first conducting voltage V1 increases.Wherein, the first conducting electric current Ib and detection electric current Isns
Ratio be second detection unit 402 in first switch tube M1 breadth length ratio and second switch M2 breadth length ratio ratio.
When control voltage V2 reaches control voltage threshold, the grid source of the third switching tube M3 in first detection unit 401
Voltage difference has reached cut-in voltage Vth-M3.When the ratio of the breadth length ratio and the breadth length ratio of second switch M2 of first switch tube M1 is
When k:1, the ratio of detection electric current Isns and the first conducting electric current Ib is 1:K.Therefore, the first conducting electric current preset value can be derived
IbthWith the cut-in voltage V of first resistor R1, third switching tubeth-M3And the equilibrium relationships of ratio K are as follows:
It can thus be seen that the first conducting electric current preset value IbthIt is related with first resistor R1 and ratio k, can by adjusting ratio k with
And the resistance value of first resistor R1 sets the first conducting electric current setting value Ibth, as the first conducting electric current setting value IbthReach institute
When the value of setting, control voltage has also reached control voltage threshold, i.e. the gate source voltage of third switching tube M3 reaches cut-in voltage
Vth-M3。
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 and the first conducting electric current, so that having received 303 pairs of input electricity of surge drain unit of the first conducting voltage
Pressure carries out aerial drainage, exports discharge current；And second detection unit 302 can be exported and be led with first when receiving the first conducting electric current
Galvanization is at the detection electric current of ratio relation, and second detection unit 302 is according to the corresponding control voltage of detection electric current output；The
After one detection unit 301 receives control voltage, when controlling voltage higher than control voltage threshold, the first of output can be made to lead
The pressure that is powered increases, and the discharge capacity of surge drain unit 302 is enabled to enhance, and clamp voltage reduces, and input voltage maximum value reduces, into
One step reduces the maximum power of surge protection circuit receiving, and the maximum input voltage duration shortens, and keeps surge protection electric
Road is safer.
Refering to Fig. 5, when surge voltage is 100V, maximum discharge current IIN is 32.669A, and input voltage VIN is at this time
32.883V.According to rating formula P=UI, maximum transient power Pmax=32.883 × 32.669=1074.25W.Comparison
Maximum transient power 1143.17W in Fig. 2, it can be seen that the maximum transient power decline that surge protection circuit is born.Comparison diagram 2
In the first conducting voltage be the first conducting voltage in 3.4375V and Fig. 5 be 3.7019V, it can be seen that the embodiment of the present application phase
Surge protection circuit more in the prior art, the first conducting voltage increased, the discharge capacity enhancing of surge drain unit.And
And the maximum input voltage 36.245V in the maximum input voltage 38.296V and Fig. 5 in comparison diagram 2, it is known that the maximum in Fig. 5
Input voltage reduces about 2V compared with the maximum input voltage in Fig. 2, and maximum input voltage duration is also significantly shorter than in Fig. 5
Maximum input voltage duration in Fig. 2, the reduction and the shortening of maximum input voltage duration of maximum input voltage make
The time that the voltage that entire circuit is born 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, the electronic equipment can include but is not limited to mobile phone, tablet computer, other universal serial bus
(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, second detection unit, surge drain unit；Wherein, the first detection unit is respectively with described
Two detection units are connected with the surge drain 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 and the first conducting electric current；When the control voltage is greater than control voltage threshold
When, the first detection unit increases first conducting voltage and the first conducting electric current；
The second detection unit, for receiving the first conducting electric current of the input voltage and the first detection unit, institute
Second detection unit is stated according to the input voltage and the first conducting electric current, obtains the inspection for having ratio with first conducting electric current
Electric current is surveyed, and exports the control voltage corresponding with the detection electric current according to the detection electric current；
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.
2. surge protection circuit according to claim 1, which is characterized in that the second detection unit includes: first to open
Close pipe and second switch and first resistor；
The control terminal of the first switch tube is connected with the control terminal of its second end and the second switch respectively, and described first
The first end of switching tube is grounded, and the second end of the first switch tube is for receiving first conducting electric current；Described second opens
The second end for closing pipe is connected with the first resistor, first end ground connection；The other end of the first resistor receives the input electricity
Pressure；Wherein, after the first switch tube and second switch are connected under the action of the first conducting electric current, the second switch
Connection branch obtain the detection electric current, and export the control voltage.
3. surge protection circuit according to claim 1, which is characterized in that the first detection unit includes: pressure stabilizing electricity
Road, third switching tube and second resistance；
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；
It is used for exporting first conducting voltage, one end of the second resistance ground connection one end of the second resistance remotely
In output first conducting electric current；
At least one first zener diode in the first end and second end of the third switching tube voltage regulator circuit in parallel, institute
The control terminal for stating third switching tube receives the control voltage.
4. surge protection circuit according to claim 3, which is characterized in that the first detection unit further include: second
Zener diode, the anode of second zener diode connect the control terminal of the third switching tube, second pressure stabilizing two
The cathode of pole pipe connects the first end of the third switching tube.
5. surge protection circuit according to claim 1, which is characterized in that the surge drain unit includes:
The second end of 4th switching tube, the 4th switching tube receives the input voltage, the control terminal of the 4th switching tube
For receiving first conducting voltage, the first end ground connection of the 4th switching tube.
6. surge protection circuit as claimed in any of claims 2 to 5, which is characterized in that the switching tube, packet
It includes: 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 described in claim 1 to 6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811382183.2A CN109193606B (en) | 2018-11-20 | 2018-11-20 | Surge protection circuit, circuit system and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811382183.2A CN109193606B (en) | 2018-11-20 | 2018-11-20 | Surge protection circuit, circuit system and electronic equipment |
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| CN109193606A true CN109193606A (en) | 2019-01-11 |
| CN109193606B CN109193606B (en) | 2024-03-01 |
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