CN207967934U - A kind of surge protection circuit and device - Google Patents
A kind of surge protection circuit and device Download PDFInfo
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- CN207967934U CN207967934U CN201820415838.0U CN201820415838U CN207967934U CN 207967934 U CN207967934 U CN 207967934U CN 201820415838 U CN201820415838 U CN 201820415838U CN 207967934 U CN207967934 U CN 207967934U
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Abstract
The utility model belongs to technical field of electronic equipment, provide a kind of surge protection circuit, the surge protection circuit includes the first protection location, decoupling unit and the second protection location, surge current is absorbed by the first protection location and the second protection location two-stage protection circuit to protect secondary circuit, parasitic couplings in circuit are eliminated using decoupling unit, so that the voltage that power output end output is stable, it ensure that the safety of secondary circuit, circuit structure is simple in the utility model, it is of low cost, realize Anti-surging effect, and it is readily applied in compact apparatus.
Description
Technical field
The utility model belongs to technical field of electronic equipment more particularly to a kind of surge protection circuit and device.
Background technology
Surge Protector is also known as lightning protection device, is that a kind of provided for electronic equipment, instrument and meter, communication line etc. is prevented safely
The electronic device of shield, the frequency for being suitable for alternating current are 50 hertz or 60 hertz, and rated voltage is the power supply system of 220V to 380V
In system.Surge Protector is for protecting the surge of instantaneous overvoltage caused by indirect thunder and lightning, direct thunder and lightning or other reasons
Shield, specifically, when generating peak current or voltage suddenly because of extraneous interference in electric loop either communication line, wave
Shunting can be connected in surge protector within the extremely short time, to avoid damage of the surge to other equipment in circuit.
However, current Surge Protector volume is big, and it is complicated, of high cost, some miniaturized electronics can not be applicable in
Equipment.
Utility model content
The purpose of this utility model is to provide a kind of surge protection circuit and devices, it is intended to solve traditional surge protection
Volume present in device is big, problem complicated, of high cost.
The utility model embodiment provides a kind of surge protection circuit, the surge protection circuit be connected to power supply with time
Between grade circuit, including：
The first end of first protection location, first protection location is connect with the first end of the power supply, and described first
The second end of protection location is connect with the second end of the power supply, and first protection location is used to carry out first to input voltage
Secondary aerial drainage；
First protection location includes：First diode, first resistor, the first light emitting diode, the first fuse,
Two resistance；
The anode of first diode is connect altogether with the first end of the second resistance as first protection location
The cathode of first end, first diode is connect with the first end of the first resistor, the second end of the first resistor with
The anode of first light emitting diode connects, and the cathode of first light emitting diode is total with the second end of the second resistance
Be connected to the first end of first fuse, the second end of first fuse as first protection location second
End；
Decoupling unit, the first input end of the decoupling unit is connect with the first end of first protection location, described
Second input terminal of decoupling unit is connect with the second end of first protection location, and the decoupling unit is for eliminating the wave
Gush the parasitic couplings generated in protection circuit；
Second protection location, the first end of second protection location are connect with the first output end of the decoupling unit,
The second end of second protection location is connect with the second output terminal of the decoupling unit, second protection location for pair
The residual voltage of the first protection location output carries out second of aerial drainage；
Second protection location includes：Second diode, 3rd resistor, the second light emitting diode, the first voltage-stabiliser tube,
Two fuses；
The anode of second diode and the first end of first voltage-stabiliser tube are connect altogether as second protection location
First end connect with the first input end of the secondary circuit, the of the cathode of second diode and the 3rd resistor
One end connects, and the second end of the 3rd resistor is connect with the anode of second light emitting diode, second light-emitting diodes
The second end of the cathode of pipe and first voltage-stabiliser tube is connected to the first end of second fuse altogether, and the of second insurance
Two ends are connect as the second end of second protection location with the second input terminal of the secondary circuit.
As one embodiment of the utility model, the decoupling unit includes：First inductance and the second inductance；
First input end of the first end of first inductance as the decoupling unit, the second end of first inductance
As the first output end of the decoupling unit, the second input terminal of the first end of second inductance as decoupling unit, institute
State second output terminal of the second end of the second inductance as the decoupling unit.
As one embodiment of the utility model, the decoupling unit includes：4th resistance and the 5th resistance；
First input end of the first end of 4th resistance as the decoupling unit, the second end of the 4th resistance
As the first output end of the decoupling unit, the second input terminal of the first end of the 5th resistance as decoupling unit, institute
State second output terminal of the second end of the 5th resistance as the decoupling unit.
As one embodiment of the utility model, the decoupling unit includes：First capacitance, the second capacitance, third capacitance with
And the 4th capacitance；
The first end of first capacitance and the first end of second capacitance connect first as the decoupling unit altogether
Input terminal is connect with the first output end of the decoupling unit, the second end of first capacitance and the second of second capacitance
End is connected to ground altogether, and the first end of the first end of the third capacitance and the 4th capacitance connects the as the decoupling unit altogether
Two input terminals are connect with the second output terminal of the decoupling unit, and the of the second end of the third capacitance and the 4th capacitance
Two ends are connected to ground altogether.
As one embodiment of the utility model, the second resistance is varistor.
As one embodiment of the utility model, first fuse and second fuse are thermally fused resistor silk.
As one embodiment of the utility model, the decoupling unit is decoupler.
As one embodiment of the utility model, the decoupler is KBT-L series decouplers.
As one embodiment of the utility model, the surge protection circuit further includes indicating unit；
The first end of the indicating unit is connect with the first end of second protection location, and the second of the indicating unit
End is connect with the second end of second protection location.
The another object of the utility model is, provide it is a kind of including foregoing circuit be connected to power supply and secondary circuit it
Between surge protective device.
Surge protection circuit in the utility model is connected between power supply and secondary circuit, which includes
First protection location, decoupling unit and the second protection location are protected by the first protection location and the second protection location two-stage
Circuit absorbs surge current and is protected to secondary circuit, eliminates the parasitic couplings in circuit using decoupling unit so that power supply
The stable voltage of output end output, ensure that the safety of secondary circuit, and circuit structure is simple, at low cost in the utility model
It is honest and clean, Anti-surging effect is realized, and be readily applied in miniaturized electronic devices.
Description of the drawings
Fig. 1 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 1 provides；
Fig. 2 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 2 provides；
Fig. 3 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 3 provides；
Fig. 4 is a kind of structure chart for surge protection circuit that the utility model embodiment 4 provides.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Fig. 1 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 1 provides, for the ease of saying
Bright, only the parts related to this embodiment are shown, and details are as follows：
The utility model embodiment provide a kind of surge protection circuit 20 include：For being carried out for the first time to input voltage
First protection location 201 of aerial drainage, the first end of the first protection location 201 are connect with the first end of power supply 10, and the first protection is single
The second end of member 201 is connect with the second end of power supply 10；In the present embodiment, the first protection location 201 includes：First diode
D1, first resistor R1, the first Light-emitting diode LED 1, the first fuse F1, second resistance R2；Wherein, the first diode D1
The first end of anode and second resistance R2 connect the first end as the first protection location 201 altogether, the first end of second resistance R2 with
The first end of first protection location 201 connects, and the cathode of the first diode D1 is connect with the first end of first resistor R1, the first electricity
The second end of resistance R1 is connect with the anode of the first Light-emitting diode LED 1, the cathode and second resistance of the first Light-emitting diode LED 1
The second end of R2 is connected to the first end of the first fuse F1 altogether, and the second end of the first fuse F1 is as the first protection location 201
Second end.
Surge protection circuit 20 in the present embodiment further includes decoupling unit 202, the first input end of decoupling unit 202 with
The first end of first protection location 201 connects, the second end of the second input terminal of decoupling unit 202 and the first protection location 201
Connection；Specifically, decoupling unit 202 is for eliminating the parasitic couplings generated in surge protection circuit 20.
Surge protection circuit 20 in the present embodiment further include residual voltage for being exported to the first protection location 201 into
Second protection location 203 of second of aerial drainage of row, in the present embodiment, first end and the decoupling unit of the second protection location 203
202 the first output end connection, the second end of the second protection location 203 are connect with the second output terminal of decoupling unit 202；Specifically
, the second protection location 203 includes：Second diode D2,3rd resistor R3, the second Light-emitting diode LED 2, the first voltage-stabiliser tube
T1, the second fuse F2；Wherein, the first end of the anode of the second diode D2 and the first voltage-stabiliser tube T1 are connect altogether as the second protection
The first end of unit 203 is connect with the first input end of secondary circuit 30, and the cathode of the second diode D2 is with 3rd resistor R3's
First end connects, and the second end of 3rd resistor R3 is connect with the anode of the second Light-emitting diode LED 2, the second light emitting diode
The second end of the cathode of LED2 and the first voltage-stabiliser tube T1 are connected to the first end of the second fuse F2, the second end of the second insurance F2 altogether
It is connect with the second input terminal of secondary circuit 30 as the second end of the second protection location 203.
As one embodiment of the utility model, decoupling unit 202 includes：First inductance L1 and the second inductance L2；Specifically,
First input end of the first end of first inductance L1 as decoupling unit 202, the second end of the first inductance L1 is as decoupling unit
202 the first output end, the second input terminal of the first end of the second inductance L2 as decoupling unit 202, the of the second inductance L2
Second output terminal of two ends as decoupling unit 202.In the present embodiment, decoupling unit 202 is for preventing the first protection location
201 and the second electric current in protection location 203 during dropping rheology due to the current russ pair formed in power supply circuit
Supply network stability has an impact, at this point, decoupling unit 202 can effectively eliminate the parasitic coupling between circuit supply network
It closes.
Fig. 2 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 2 provides, in the present embodiment
In, decoupling unit 202 includes：4th resistance R4 and the 5th resistance R5；Specifically, the first end of the 4th resistance R4 is as decoupling list
The first input end of member 202, the first output end of the second end of the 4th resistance R4 as decoupling unit 202, the 5th resistance R5's
The second end of second input terminal of the first end as decoupling unit 202, the 5th resistance R5 is exported as the second of decoupling unit 202
End.
Fig. 3 is a kind of circuit structure diagram for surge protection circuit that the utility model embodiment 3 provides, in the present embodiment
In, decoupling unit 202 includes：First capacitance C1, the second capacitance C2, third capacitance C3 and the 4th capacitance C4；Specifically, first
The first end of capacitance C1 and the first end of the second capacitance C2 connect the first input end and decoupling unit as decoupling unit 202 altogether
The second end of 202 the first output end connection, the second end of the first capacitance C1 and the second capacitance C2 are connected to ground, third capacitance C3 altogether
The first end of first end and the 4th capacitance C4 connect the of the second input terminal as decoupling unit 202 and decoupling unit 202 altogether
Two output ends connect, and the second end of third capacitance C3 is connected to ground altogether with the second end of the 4th capacitance C4.
As one embodiment of the utility model, second resistance R2 is varistor.In the present embodiment, when the first protection is single
When the voltage between two input terminals in member 201 is excessive, carried out when bearing overvoltage by the first protection location of varistor pair 201
Voltage clamping absorbs extra current protecting circuit, at this point, being become larger by the electric current of second resistance R2.
As one embodiment of the utility model, the first fuse F1 and the second fuse F2 are thermally fused resistor silk.Specifically
, voltages of the second resistance R2 between two input terminals of the first protection location 201 generates heat when excessive, when second resistance R2 is pressure
Extra electric current can be absorbed when quick resistance when voltage is excessive, varistor, which largely generates heat, at this time conducts to thermal fuse F1
In, when heat reaches the threshold value of the first fuse F1, the first blown fuse, the first Light-emitting diode LED 1 is extinguished, and first
Shielding failure of the protection location 201 to circuit.In the second protection location 203, the first voltage-stabiliser tube T1 and the second fuse F2 strings
Connection, the first voltage-stabiliser tube T1 are Transient Suppression Diode, when the voltage between 203 liang of input terminals of the second protection location is more than first surely
When the breakdown threshold voltage of pressure pipe, the working impedance of the first voltage-stabiliser tube T1 is down to extremely low conduction value, to allow high current logical
Cross, at this time the voltage clamp between 203 liang of input terminals of the second protection location within a preset range, due to passing through the first voltage-stabiliser tube T1
Electric current it is excessive, the second fuse F2 endothermic temperatures drastically increase the when of reaching fusing threshold value and fuse at this time, second luminous two
Pole pipe LED2 extinguishes, shielding failure of second protection location 203 to circuit.
As one embodiment of the utility model, decoupling unit 202 is decoupler.In the present embodiment, decoupler is to instantaneous
The splendid inductance characteristic of high energy lightning current carrys out the interim reliable operation for ensureing surge protector in thunder and lightning, due to the in circuit
One protection location 201 and the second protection location 203 are surge protection unit, the first protection location 201 and the second protection location
It can influence each other between 203, be posted by connecting decoupler elimination between the first protection location 201 and the second protection location 203
The influence of raw capacitance.On the other hand, decoupler is installed in series in low-voltage power supply system, can be used for increasing conducting wire induction reactance, more
The deficiency for mending conductor length, coordinates the matching problem between the protection location of different size.Specifically, in the present embodiment, root
Corresponding decoupler is selected according to the load current of circuit.
As one embodiment of the utility model, decoupler is KBT-L series decouplers.Specifically, KBT-L series decouplers
It using modular organization, is connected in series between front and back stages protection location, is selected according to the load current in circuit specific
Decoupler model.
Fig. 4 is a kind of structure chart for surge protection circuit that the utility model embodiment 4 provides, in the present embodiment, wave
It further includes indicating unit 204 to gush protection circuit 20, and the first end of indicating unit 204 and the first end of the second protection location 203 connect
It connects, the second end of indicating unit 204 is connect with the second end of the second protection location 203.Specifically, indicating unit 204 includes the
Three Light-emitting diode LED 3 and the 5th resistance R5, the first end of the anode of third Light-emitting diode LED 3 as indicating unit 204,
The cathode of third Light-emitting diode LED 3 is connect with the first end of the 5th resistance R5, and the second end of the 5th resistance R5 is single as instruction
The second end of member 204.When surge protection circuit 20 works normally, 3 normal luminous of third Light-emitting diode LED, when surge is protected
When protection circuit 20 fails in overvoltage, third Light-emitting diode LED 3 is extinguished.
The utility model also proposed a kind of surge protective device, be connected between power supply and secondary circuit, which protects
Protection unit includes such as the surge protection circuit in any of the above-described embodiment.
As one embodiment of the utility model, air switch generation may be used in the first fuse F1 and the second fuse F2
It replaces.Specifically, when flowing through the controller electric current of second resistance R2 or the first voltage-stabiliser tube T1, air switch disconnects.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle
Within the scope of shield.
Claims (10)
1. a kind of surge protection circuit, is connected between power supply and secondary circuit, which is characterized in that including：
The first end of first protection location, first protection location is connect with the first end of the power supply, first protection
The second end of unit is connect with the second end of the power supply, and first protection location is used to input voltage let out for the first time
Stream；
First protection location includes：First diode, first resistor, the first light emitting diode, the first fuse, the second electricity
Resistance；
The anode of first diode connects first as first protection location with the first end of the second resistance altogether
End, the cathode of first diode connect with the first end of the first resistor, the second end of the first resistor with it is described
The anode of first light emitting diode connects, and the cathode of first light emitting diode is connected to altogether with the second end of the second resistance
The first end of first fuse, the second end of the second end of first fuse as first protection location；
Decoupling unit, the first input end of the decoupling unit are connect with the first end of first protection location, the decoupling
Second input terminal of unit is connect with the second end of first protection location, and the decoupling unit is protected for eliminating the surge
The parasitic couplings generated in protection circuit；
Second protection location, the first end of second protection location is connect with the first output end of the decoupling unit, described
The second end of second protection location is connect with the second output terminal of the decoupling unit, and second protection location is used for described
The residual voltage of first protection location output carries out second of aerial drainage；
Second protection location includes：Second diode, 3rd resistor, the second light emitting diode, the first voltage-stabiliser tube, second protect
Dangerous silk；
The first end of the anode of second diode and first voltage-stabiliser tube connects the as second protection location altogether
One end is connect with the first input end of the secondary circuit, the first end of the cathode and the 3rd resistor of second diode
Connection, the second end of the 3rd resistor are connect with the anode of second light emitting diode, second light emitting diode
The second end of cathode and first voltage-stabiliser tube is connected to the first end of second fuse, the second end of second insurance altogether
It is connect with the second input terminal of the secondary circuit as the second end of second protection location.
2. surge protection circuit as described in claim 1, which is characterized in that the decoupling unit includes：First inductance and
Two inductance；
First input end of the first end of first inductance as the decoupling unit, the second end conduct of first inductance
First output end of the decoupling unit, the second input terminal of the first end of second inductance as decoupling unit, described
Second output terminal of the second end of two inductance as the decoupling unit.
3. surge protection circuit as described in claim 1, which is characterized in that the decoupling unit includes：4th resistance and
Five resistance；
First input end of the first end of 4th resistance as the decoupling unit, the second end conduct of the 4th resistance
First output end of the decoupling unit, the second input terminal of the first end of the 5th resistance as decoupling unit, described
Second output terminal of the second end of five resistance as the decoupling unit.
4. surge protection circuit as described in claim 1, which is characterized in that the decoupling unit includes：First capacitance, second
Capacitance, third capacitance and the 4th capacitance；
The first end of first capacitance and the first end of second capacitance connect the first input as the decoupling unit altogether
End is connect with the first output end of the decoupling unit, and the second end of first capacitance and the second end of second capacitance are total
With being connected to, the first end of the third capacitance and the first end of the 4th capacitance connect defeated as the second of the decoupling unit altogether
Enter end to connect with the second output terminal of the decoupling unit, the second end of the second end of the third capacitance and the 4th capacitance
It is connected to ground altogether.
5. surge protection circuit as described in claim 1, which is characterized in that the second resistance is varistor.
6. surge protection circuit as described in claim 1, which is characterized in that first fuse and second fuse
It is thermally fused resistor silk.
7. surge protection circuit as described in claim 1, which is characterized in that the decoupling unit is decoupler.
8. surge protection circuit as claimed in claim 7, which is characterized in that the decoupler is KBT-L series decouplers.
9. surge protection circuit as described in claim 1, which is characterized in that the surge protection circuit further includes that instruction is single
Member；
The first end of the indicating unit is connect with the first end of second protection location, the second end of the indicating unit with
The second end of second protection location connects.
10. a kind of surge protective device, is connected between power supply and secondary circuit, which is characterized in that the surge protective device
Including surge protection circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820415838.0U CN207967934U (en) | 2018-03-23 | 2018-03-23 | A kind of surge protection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820415838.0U CN207967934U (en) | 2018-03-23 | 2018-03-23 | A kind of surge protection circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207967934U true CN207967934U (en) | 2018-10-12 |
Family
ID=63725262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820415838.0U Active CN207967934U (en) | 2018-03-23 | 2018-03-23 | A kind of surge protection circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207967934U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039041A (en) * | 2020-07-16 | 2020-12-04 | 安克创新科技股份有限公司 | Surge protection circuit, lightning protection device and electronic equipment |
-
2018
- 2018-03-23 CN CN201820415838.0U patent/CN207967934U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039041A (en) * | 2020-07-16 | 2020-12-04 | 安克创新科技股份有限公司 | Surge protection circuit, lightning protection device and electronic equipment |
| WO2022012638A1 (en) * | 2020-07-16 | 2022-01-20 | 安克创新科技股份有限公司 | Surge protection circuit, lightning protector and electronic device |
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