CN108574263A - A kind of over-pressed and surge protection circuit - Google Patents
A kind of over-pressed and surge protection circuit Download PDFInfo
- Publication number
- CN108574263A CN108574263A CN201710140664.1A CN201710140664A CN108574263A CN 108574263 A CN108574263 A CN 108574263A CN 201710140664 A CN201710140664 A CN 201710140664A CN 108574263 A CN108574263 A CN 108574263A
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- overvoltage
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- 230000003111 delayed effect Effects 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims abstract description 22
- 239000004065 semiconductor Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000007600 charging Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- 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
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to circuit protection field, discloses a kind of overvoltage and surge protection circuit, the circuit include：Overvoltage protective module, delayed module and switch module；Mutual circuitry phase connection, the overvoltage protective module and the switch module match between three modules, play the role of overvoltage protection; i.e. overvoltage protective module is when detecting that circuit input voltage is more than preset value; the switch module will be controlled to close, cut off electric current, protect back-end circuit；Delayed module and switch module match, and play the role of delay startup, i.e. delayed module will influence the conducting degree of switch module, and switch module is just gradually turned on after circuit powers on a period of time；Overvoltage and surge protection circuit can effectively prevent overvoltage used by the embodiment of the present invention, surge phenomenon damages electronic product, and applicability is wide, and fairly simple in structure design, can reduce circuit and cost is made.
Description
Technical field
The present invention relates to circuit protection fields, especially, are related to a kind of over-pressed and surge protection circuit.
Background technology
Currently, in deisgn product in order to promote the reliability of product, it is necessary to consider the protection to product circuit；Instantly,
Anti- overvoltage, anti-surge circuit, now most common anti-overvoltage, Anti-surging solution party are designed in many products or product accessories
Case is：In power input series connection negative tempperature coefficient thermistor (NTC thermistor), the resistance value of the resistance can be with temperature
It increases and is in non-linear decline, when not having electric current to flow through on thermistor, the temperature of resistance is relatively low, and impedance is larger, can be very
Good inhibition surge current prevents circuit overvoltage and spark phenomenon；But thermistor also can only be in certain temperature range
Interior work, if thermistor works long hours under the hot environment being resistant to more than it, can also damage or fail and
Generation can not inhibit the risk of surge current.Therefore, with regard to a kind of more structurally sound overvoltage of design in need and surge protection circuit
Come the stability and reliability enhanced product performance.
Invention content
The present invention provides a kind of over-pressed and surge protection circuit, it is therefore intended that solves existing overvoltage and surge protection design knot
Structure is complicated, of high cost and the technical issues of be unable to effective protection circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
The present invention provides a kind of overvoltage and surge protection circuits, including be connected to direct-flow input end and DC output end it
Between overvoltage protective module, delayed module and switch module；
Wherein, the first input of the overvoltage protective module, one end of the delayed module and the switch module
End connection direct-flow input end, the overvoltage protective module connect the switch module with the other end of the delayed module
The output end of second input terminal, the switch module connects DC output end.
Further, the overvoltage protective module includes sequentially connected over-pressed detection unit, over-pressed trigger element and mistake
Press control unit；
The overvoltage trigger element sends overvoltage when the over-pressed detection unit detects that input voltage is higher than preset value
Signal is controlled to the over-pressed control unit, the overvoltage control unit controls the switch after receiving the overvoltage control signal
Module is closed, and electric current is cut off.
Further, the over-pressed detection unit includes diode and the 6th resistance；
The cathode of the diode connects the direct-flow input end, the anode of the diode and the one of the 6th resistance
End connects, the other end ground connection of the 6th resistance.
Further, the over-pressed trigger element includes the 5th resistance, the second capacitance and the second triode；
One end of 5th resistance connects the anode of the diode, the other end of the 5th resistance respectively with it is described
The base stage connection of one end of the second capacitance, second triode, the other end of second capacitance, second triode
Emitter is grounded.
Further, the over-pressed control unit includes the first triode, second resistance and 3rd resistor；
One end of the second resistance, the 3rd resistor one end connect the base stage of first triode；
The emitter of the other end of the second resistance and first triode connects direct-flow input end together；
The collector of first triode connects the second input terminal of the switch module；
The other end of the 3rd resistor connects the collector of second triode.
Further, the delayed module includes first resistor, the first capacitance and the 4th resistance；
One end of 4th resistance is grounded, and the first resistor connects direct current input with one end of first capacitance
End；
4th resistance, the first resistor, first capacitance the other end be all connected with the switch module second
Input terminal.
Further, the switch module using metal-oxide-semiconductor be used as contactor, the metal-oxide-semiconductor source electrode conduct described in open
The first input end for closing module is connected with the direct-flow input end；Output of the drain electrode of the metal-oxide-semiconductor as the switch module
End is connected with the DC output end；The grid of the metal-oxide-semiconductor as the switch module the second input terminal respectively with it is described
Overvoltage protective module, delayed modular circuit connection.
As a kind of alternative of the embodiment of the present invention, the metal-oxide-semiconductor is PMOS tube.
Compared with prior art, beneficial effects of the present invention are：
Overvoltage provided by the present invention and surge protection circuit include three modules：Overvoltage protective module, delayed mould
Block, switch module；Overvoltage protective module is detected circuit voltage, when voltage of the load on circuit exceeds preset value,
Overvoltage protective module will control switch module and close, and cut off electric current, protect circuit；After circuit voltage value revert to normal value,
Overvoltage crowbar is not triggered, and switch module normally, circuit is returned to normal operating conditions；When being powered on to circuit,
Delayed module and switch module match, and play the role of delay startup, i.e. delayed module will influence leading for switch module
Logical degree, switch module is just gradually turned on after circuit powers on a period of time；Designing in this way is advantageous in that：Can effectively it prevent
Only overvoltage and surge phenomenon damage circuit；It is fairly simple in structure design simultaneously, circuit can be reduced, cost is made, and grasped
It is easy, applicability is wide.
Description of the drawings
Fig. 1 is overvoltage provided in an embodiment of the present invention and surge protection circuit circuit diagram；
Fig. 2 is the circuit diagram of overvoltage provided in an embodiment of the present invention and surge protection circuit；
Reference sign：10- overvoltage protective modules, 11- overvoltages detection unit, 12- overvoltages trigger element, 13- overvoltages
Control unit, 20- delayeds module, 30- switch modules, D1- diodes, R1- first resistors, R2- second resistances, R3-
Three resistance, the 4th resistance of R4-, the 5th resistance of R5-, the 6th resistance of R6-, the first capacitances of C1-, the second capacitances of C2-, Q1-MOS pipe,
The first triodes of Q2-, the second triodes of Q3-.
Specific implementation mode
To facilitate the understanding of the present invention, the present invention is described comprehensively below with reference to relevant drawings.It is provided in attached drawing
Presently preferred embodiments of the present invention.But the present invention can there are many different forms to realize, however it is not limited to described herein
Embodiment.On the contrary, it is to keep the understanding to the disclosure more thorough complete to be supplied to the purpose of these embodiments
Face.
Unless otherwise defined, the technology people of technical and scientific term used herein and the technical field for belonging to the present invention
The normally understood meaning of member is identical.Used category is implemented then for description is specific in the description of the invention herein
The purpose of example, it is not intended that in the limitation present invention.
Refering to fig. 1, it is overvoltage provided in an embodiment of the present invention and surge protection circuit structural schematic diagram, implements in the present invention
In mode：
An embodiment of the present invention provides a kind of overvoltage and surge protection circuits comprising：Overvoltage protective module 10 powers on and prolongs
When module 20 and switch module 30；Wherein, one end and institute of the overvoltage protective module 10 and the delayed module 20
The first input end for stating switch module 30 connects the direct-flow input end, the overvoltage protective module 10 and the delayed mould
The other end of block 20 connects the second input terminal of the switch module 30, and the output end of the switch module 30 connects the direct current
Output end；Overvoltage protective module 10 is detected circuit voltage, when voltage of the load on circuit exceeds preset value, overvoltage
Protection module 10 is closed switch module 30 is controlled, and is cut off electric current, is protected circuit；After circuit voltage value revert to normal value,
Overvoltage crowbar 10 is not triggered, and 30 normally of switch module, circuit is returned to normal operating conditions；It is powered on to circuit
When, delayed module 20 and switch module 30 match, and play the role of delay startup, i.e. delayed module will influence switching molding
The conducting degree of block, switch module is just gradually turned on after circuit powers on a period of time, so circuit can be prevented unexpected
When powering on or inputting high current suddenly, surge phenomenon occurs in circuit, circuit is caused to be struck sparks；
Further, the overvoltage protective module 10 includes：Sequentially connected overvoltage detection unit 11, over-pressed trigger element
12 and over-pressed control unit 13；When the overvoltage detection unit 11 detects that input voltage is higher than preset value, the overvoltage triggering
Unit is transmitted across voltage-controlled signal processed to the over-pressed control unit 13, and the overvoltage control unit 13 receives the overvoltage control letter
After number, the closing of the switch module 30 is controlled, electric current is cut off, circuit is protected not to be damaged；When the over-pressed detection unit 11 detects
When reverting to normal value to circuit voltage, the overvoltage trigger element 12 is not triggered, while the over-pressed control unit 13 is not
Action, the switch module 30 are connected, circuit normal work.
Referring to Fig.2, for overvoltage provided in an embodiment of the present invention and the circuit diagram of surge protection circuit, in embodiment party of the present invention
In formula：
The overvoltage detection unit 11 includes：Diode D1 and the 6th resistance R6；
The overvoltage trigger element 12 includes：5th resistance R5, the second capacitance C2 and the second triode Q3；
The overvoltage control unit 13 includes：First triode Q2, second resistance R2 and 3rd resistor R3；
The delayed module 20 includes：First resistor R1, the first capacitance C1 and the 4th resistance R4；
Specifically, the connection relation between overvoltage provided in an embodiment of the present invention and each component of surge protection circuit is such as
Under：
The cathode of the diode D1 connects direct-flow input end, the second end of the diode D1 and the 6th resistance R6
One end connect, the other end of the 6th resistance R6 ground connection；
The one end the 5th resistance R5 connects the anode of the diode D1, the other end of the 5th resistance R5 respectively with
The base stage of one end of the second capacitance C2 and the second triode Q3 connect, the other end of the second capacitance C2, it is described
The emitter of second triode Q3 is grounded, and the collector of the second triode Q3 and one end of the 3rd resistor R3 connect；
The other end of the 3rd resistor R3, the second resistance R2 one end connect the base of the first triode Q2
The emitter one of pole, the other end of the second resistance R2 and the first triode Q2, which lead to, connects the direct-flow input end, institute
The collector for stating the first triode Q2 connects the second input terminal of the switch module 30；
One end of the 4th resistance R4 is grounded, and the first resistor R1 connects described straight with described one end first capacitance C1
Flow input terminal；
The 4th resistance R4, the first resistor R1, the first capacitance C1 the other end be all connected with the switching molding
Second input terminal of block 30.
Referring to Fig.2, as a preferred embodiment of the present invention, the switch module 30 is opened using metal-oxide-semiconductor Q1 as circuit
It closes, the source electrode of the metal-oxide-semiconductor Q1 is connected as the first input end of the switch module 30 with the direct-flow input end；It is described
The drain electrode of metal-oxide-semiconductor Q1 is connected as the output end of the switch module 30 with the DC output end；The grid of the metal-oxide-semiconductor Q1
The second input terminal as the switch module 30 respectively with the overvoltage protective module 10,20 circuit of delayed module
Connection is further, and the metal-oxide-semiconductor Q1 uses PMOS tube；
The course of work of overvoltage provided in an embodiment of the present invention and surge protection circuit is as follows：
1, when Anti-surging circuit the course of work：After DC current input circuit, the first capacitance C1 is equivalent to short
The grid on road, the metal-oxide-semiconductor Q1 is identical with source voltage, and the metal-oxide-semiconductor Q1 is not turned on；The first capacitance C1 is the same as the described 4th
Resistance R4 forms a RC charging network, and the pressure difference (RC chargings constant) between the grid and source electrode of the metal-oxide-semiconductor Q1 slowly increases
Greatly, while the conducting degree of the metal-oxide-semiconductor Q1 also slowly increases；After the first capacitance C1 charging completes, the metal-oxide-semiconductor Q1
Also enter fully on state；This process is gradually turned on later because the metal-oxide-semiconductor Q1 is powered in circuit, so that
Entire circuit is also to gradually form access, and which forms the processes of a circuit delay startup, the advantage of doing so is that, work as circuit
When powering on suddenly or input high current suddenly, generation surge phenomenon in circuit is can effectively prevent, prevents circuit from striking sparks；
2, the course of work of circuit when anti-over-pressed：When the voltage of DC supply input circuit is normal, input voltage vin is same
The difference of the diode D1 burning voltages is less than the emitter junction conducting voltage of the second triode Q3, second triode
Q3 is in cut-off state；The 6th resistance R6 acts the working condition for stablizing the diode D1, the 5th resistance R5 at this time
And tell the second capacitance C2 cooperations, it filters out some interference levels and stablizes the working condition of the second triode Q3, Yi Miansuo
State the second triode Q3 malfunctions；The current collection extremely high voltage of the second triode Q3, while the first triode Q2
In cut-off state；When DC supply input voltage is more than preset value, the input voltage vin is stablized with the diode D1
The difference of voltage is not less than the emitter junction conducting voltage of the second triode Q3, and the second triode Q3 enters conducting shape
State, the voltage between the collector and emitter of the second triode Q3 are approximately equal to 0, the first triode Q2 base voltages
It is pulled low, the first triode Q2 enters conducting state, the voltage between the first triode Q2 collector and emitters
It is approximately equal to 0, i.e., the voltage between the grid and source electrode of the described metal-oxide-semiconductor Q1 is identical, the metal-oxide-semiconductor Q1 cut-offs, the metal-oxide-semiconductor Q1's
Drain no voltage output, the advantage of doing so is that：It, can cutting by metal-oxide-semiconductor when the voltage being input in circuit is excessive
Stop to protect back-end circuit, prevents input voltage is excessive from being damaged to circuit.
Overvoltage provided in an embodiment of the present invention and surge protection circuit can prevent circuit from powering on or inputting suddenly suddenly
When high current, surge phenomenon occurs in circuit, back-end circuit can also be protected when the voltage in input circuit is excessive
Shield, prevents the damage of electrical appliance and circuit.
The present invention is not limited to the above-described embodiments and embodiment, other any Spirit Essences without departing from the present invention and original
Lower the done changes, modifications, substitutions, combinations, simplifications of reason, should be equivalent substitute mode, are all considered as being included in the present invention
Protection domain within.
Claims (8)
1. a kind of overvoltage and surge protection circuit, which is characterized in that including being connected between direct-flow input end and DC output end
Overvoltage protective module (10), delayed module (20) and switch module (30)；
Wherein, one end and the switch module of the overvoltage protective module (10) and the delayed module (20)
(30) first input end connects the direct-flow input end, the overvoltage protective module (10) and the delayed module (20)
The other end connect the second input terminal of the switch module (30), the output end of the switch module (30) connects the direct current
Output end.
2. overvoltage as described in claim 1 and surge protection circuit, which is characterized in that the overvoltage protective module (10) includes
Sequentially connected overvoltage detection unit (11), over-pressed trigger element (12) and over-pressed control unit (13)；
When the overvoltage detection unit (11) detects that input voltage is higher than preset value, the overvoltage trigger element (12) is to described
Over-pressed control unit (13) is transmitted across voltage-controlled signal processed, and the overvoltage control unit (13) controls after receiving the overvoltage control signal
Make the switch module (30) closing.
3. overvoltage as claimed in claim 2 and surge protection circuit, which is characterized in that the overvoltage detection unit (11) includes
Diode (D1) and the 6th resistance (R6)；
The cathode of the diode (D1) connects the direct-flow input end, anode and the 6th resistance of the diode (D1)
(R6) one end connects, the other end ground connection of the 6th resistance (R6).
4. overvoltage as claimed in claim 3 and surge protection circuit, which is characterized in that the overvoltage trigger element (12) includes
5th resistance (R5), the second capacitance (C2) and the second triode (Q3)；
One end of 5th resistance (R5) connects the anode of the diode (D1), the other end point of the 5th resistance (R5)
Do not connect with the base stage of one end of second capacitance (C2), second triode (Q3), second capacitance (C2) it is another
One end, second triode (Q3) emitter ground connection.
5. overvoltage as claimed in claim 4 and surge protection circuit, which is characterized in that the overvoltage control unit (13) includes
First triode (Q2), second resistance (R2) and 3rd resistor (R3)；
One end of the second resistance (R2), one end of the 3rd resistor (R3) connect the base of first triode (Q2)
Pole；
The other end of the second resistance (R2) and the emitter of first triode (Q2) connect the direct current input together
End；
The collector of first triode (Q2) connects the second input terminal of the switch module (30)；
The other end of the 3rd resistor (R3) connects the collector of second triode (Q3).
6. overvoltage as described in claim 1 and surge protection circuit, which is characterized in that the delayed module (20) includes
First resistor (R1), the first capacitance (C1) and the 4th resistance (R4)；
One end of 4th resistance (R4) is grounded, and the first resistor (R1) connects institute with one end of first capacitance (C1)
State direct-flow input end；
4th resistance (R4), the first resistor (R1), first capacitance (C1) the other end be all connected with the switch
Second input terminal of module (30).
7. overvoltage as described in claim 1 and surge protection system, which is characterized in that the switch module (30) uses MOS
It manages (Q1) and is used as contactor, the source electrode of the metal-oxide-semiconductor (Q1) is as the first input end of the switch module (30) and described
Direct-flow input end connects；Output end and the direct current output of the drain electrode of the metal-oxide-semiconductor (Q1) as the switch module (30)
End connection；The grid of the metal-oxide-semiconductor (Q1) as the switch module (30) the second input terminal respectively with the overvoltage protection
Module (10), the connection of the delayed module (20) circuit.
8. overvoltage as claimed in claim 7 and surge protection circuit, which is characterized in that the metal-oxide-semiconductor (Q1) is PMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710140664.1A CN108574263A (en) | 2017-03-10 | 2017-03-10 | A kind of over-pressed and surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710140664.1A CN108574263A (en) | 2017-03-10 | 2017-03-10 | A kind of over-pressed and surge protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108574263A true CN108574263A (en) | 2018-09-25 |
Family
ID=63577146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710140664.1A Pending CN108574263A (en) | 2017-03-10 | 2017-03-10 | A kind of over-pressed and surge protection circuit |
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| Country | Link |
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| CN (1) | CN108574263A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327030A (en) * | 2018-12-14 | 2020-06-23 | 中兴通讯股份有限公司 | Surge protection circuit and terminal of power interface and surge voltage discharge method |
| CN112310937A (en) * | 2020-10-16 | 2021-02-02 | 浪潮电子信息产业股份有限公司 | Slow start protection circuit and circuit protection integrated chip |
| CN112467971A (en) * | 2020-11-25 | 2021-03-09 | 郑州嘉晨电器有限公司 | Slow starting circuit |
| CN112993957A (en) * | 2021-03-19 | 2021-06-18 | 中国电子科技集团公司第二十九研究所 | Circuit and method for inhibiting power-on surge current of high-capacity capacitor |
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
| CN116131238A (en) * | 2023-04-14 | 2023-05-16 | 深圳市迅特通信技术股份有限公司 | Circuit for inhibiting hot plug surge current and pluggable module |
| WO2023103841A1 (en) * | 2021-12-06 | 2023-06-15 | 中兴通讯股份有限公司 | Soft start circuit and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111327030A (en) * | 2018-12-14 | 2020-06-23 | 中兴通讯股份有限公司 | Surge protection circuit and terminal of power interface and surge voltage discharge method |
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| CN112993957A (en) * | 2021-03-19 | 2021-06-18 | 中国电子科技集团公司第二十九研究所 | Circuit and method for inhibiting power-on surge current of high-capacity capacitor |
| CN112993957B (en) * | 2021-03-19 | 2023-05-09 | 中国电子科技集团公司第二十九研究所 | Circuit and method for inhibiting power-on surge current of high-capacity capacitor |
| CN113824088A (en) * | 2021-09-29 | 2021-12-21 | 深圳市智微智能科技股份有限公司 | Input power supply protection circuit and device of direct current type POE switch |
| WO2023103841A1 (en) * | 2021-12-06 | 2023-06-15 | 中兴通讯股份有限公司 | Soft start circuit and electronic device |
| CN116131238A (en) * | 2023-04-14 | 2023-05-16 | 深圳市迅特通信技术股份有限公司 | Circuit for inhibiting hot plug surge current and pluggable module |
| CN116131238B (en) * | 2023-04-14 | 2023-08-08 | 深圳市迅特通信技术股份有限公司 | Circuit for inhibiting hot plug surge current and pluggable module |
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Application publication date: 20180925 |