CN206962439U - A kind of surge protection circuit of power supply output line - Google Patents
A kind of surge protection circuit of power supply output line Download PDFInfo
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- CN206962439U CN206962439U CN201720696963.9U CN201720696963U CN206962439U CN 206962439 U CN206962439 U CN 206962439U CN 201720696963 U CN201720696963 U CN 201720696963U CN 206962439 U CN206962439 U CN 206962439U
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Abstract
The utility model discloses a kind of surge protection circuit of power supply output line; including electric capacity and diode; electric capacity and the diode head and the tail are serially connected to form closed-loop path, resistance are connected between the capacitance cathode and the diode, the resistance is also connected with casing；The positive pole of the positive terminal connection input power of the electric capacity, the negative pole of the negative pole end connection input power of the electric capacity, the positive pole of the negative pole end connection out-put supply of the diode, the negative pole of the positive terminal connection out-put supply of the diode.Based on foregoing circuit, the structure of whole circuit is simple, and electronic component is few, effectively reduces the cost of manufacture.
Description
Technical field
It the utility model is related to field of circuit technology, more particularly to a kind of surge protection circuit of power supply output line.
Background technology
It is well known that in order to ensure the voltage of the safety of power supply and output stabilization, it is necessary to access surge in power circuit
Protection circuit, when high current, high-voltage pulse signal (such as thunderbolt) input, the potential difference of each port of equipment is reduced, can be prevented
Burn out the component in high-frequency circuit, protection equipment safety, the normal operation of safeguards system.But existing surge protection circuit
Structure is complex, and the electronic component used is more, and manufacturing cost is high.
Therefore it provides a kind of surge protection circuit of power supply output line, simple in construction, electronic component is few, and manufacturing cost is low,
Just turn into those skilled in the art's urgent problem to be solved.
Utility model content
The purpose of this utility model is to provide a kind of surge protection circuit of power supply output line, simple in construction, electronic component
Few, manufacturing cost is low.
To achieve these goals, the utility model provides a kind of surge protection circuit of power supply output line, including electric capacity
And diode, the electric capacity and diode head and the tail are serially connected to form closed-loop path, the capacitance cathode and the diode it
Between be connected with resistance, the resistance is also connected with casing；The positive pole of the positive terminal connection input power of the electric capacity, the electric capacity
Negative pole end connection input power negative pole, the diode negative pole end connection out-put supply positive pole, the diode
Positive terminal connects the negative pole of out-put supply.
Preferably, the electric capacity is electrochemical capacitor.
Preferably, the resistance is resistance variable resistor.
Preferably, the resistance is piezo-resistance.
Preferably, the diode is TVS diode.
Surge protection circuit provided by the utility model, including electric capacity and diode, electric capacity and the diode head and the tail
Be serially connected to form closed-loop path, be connected with resistance between the capacitance cathode and the diode, the resistance also with casing
Connection；The positive pole of the positive terminal connection input power of the electric capacity, the negative pole of the negative pole end connection input power of the electric capacity, institute
State the positive pole of the negative pole end connection out-put supply of diode, the negative pole of the positive terminal connection out-put supply of the diode.It is above-mentioned
In circuit, electric capacity and diode head and the tail are serially connected to form closed-loop path, and now the negative pole of the positive pole of electric capacity and diode connects,
The negative pole of electric capacity and the positive pole of diode are connected, and resistance is connected with the circuit between capacitance cathode and diode cathode, should
The casing in the other end connection outside of resistance, power supply include input and output end, and the wherein positive pole of input connects electric capacity
Positive pole, the negative pole of the negative pole connection electric capacity of input, the negative pole of the cathode connecting diode of output end, the negative pole connection of output end
The positive pole of diode.Wherein, electric capacity is act as：Pulse current when being switched on or switched off is absorbed, enhancing is resisted caused by circuit
Tip interference, because with power sources in parallel, can so subsidize the power supply of power supply temporarily, make electric power outputting current more steady；The work of diode
With for：Diode is in parallel with protected circuit in the circuit board, after instantaneous voltage exceedes circuit normal working voltage, diode
Just collapse, there is provided give transient current one super-low resistance path.The result is that transient current is drawn away by diode, keep away
Protected device is opened, and makes to be always maintained at blanking voltage by protective loop before voltage recovers normal value.Work as transient pulse
After end, diode automatically replies high-impedance state, and whole loop enters normal voltage；Resistance is act as：In suppression circuit
The abnormal overvoltage often occurred, protect the circuit from the infringement of overvoltage.Based on foregoing circuit, the structure letter of whole circuit
Single, electronic component is few, effectively reduces the cost of manufacture.
Brief description of the drawings
Fig. 1 is the schematic diagram of surge protection circuit provided by the utility model.
Description of reference numerals：
1 is input power；
2 be electric capacity；
3 be resistance；
4 be diode；
5 be out-put supply；
6 be casing.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
Fig. 1 is refer to, Fig. 1 is the schematic diagram of surge protection circuit provided by the utility model.
In a kind of embodiment, surge protection circuit provided by the utility model, including electric capacity 2 and diode
4, electric capacity 2 and diode 4 head and the tail are serially connected to form closed-loop path, connect between the positive pole of electric capacity 2 and the diode 4
Resistance 3 is connected to, the resistance 3 is also connected with casing 5；The positive pole of the positive terminal connection input power 1 of the electric capacity 2, the electricity
Hold the negative pole of 2 negative pole end connection input power 1, the positive pole of the negative pole end connection out-put supply of the diode 4, two pole
The negative pole of the positive terminal connection out-put supply of pipe 4.In foregoing circuit, electric capacity 2 and the head and the tail of diode 4 are serially connected to be formed and closed back
Road, now the positive pole of electric capacity 2 be connected with the negative pole of diode 4, the negative pole of electric capacity 2 is connected with the positive pole of diode 4, in electric capacity 2
Resistance 3 is connected with circuit between positive pole and the negative pole of diode 4, the casing 5 in the other end connection outside of the resistance 3, power supply
Include the positive pole of input and output end, wherein the positive pole connection electric capacity 2 of input, the negative pole connection electric capacity 2 of input is born
Pole, the negative pole of the cathode connecting diode 4 of output end, the positive pole of the negative pole connection diode 4 of output end.Wherein, the work of electric capacity 2
With for：Absorb pulse current when being switched on or switched off, tip interference caused by enhancing resistance circuit, because with power sources in parallel, so
The power supply of power supply can be subsidized temporarily, make electric power outputting current more steady；Diode 4 is act as：Diode 4 in the circuit board with quilt
Protection circuit is in parallel, and after instantaneous voltage exceedes circuit normal working voltage, diode 4 just collapses, there is provided to instantaneous electricity
Flow a path of super-low resistance 3.The result is that transient current is drawn away by diode 4, protected device is avoided, and in electricity
Pressure is recovered to make to be always maintained at blanking voltage by protective loop before normal value.After transient pulse terminates, diode 4 returns automatically
Multiple high-impedance state, whole loop enters normal voltage；Resistance 3 is act as：The abnormal overvoltage often occurred in suppression circuit,
Protect the circuit from the infringement of overvoltage.Based on foregoing circuit, the structure of whole circuit is simple, and electronic component is few, effectively reduces
The cost of manufacture.
It is to be appreciated that when high current, high-voltage pulse occur when in power positive end, resistance 3 turns on, high current stream
To casing 5, power source internal pressure difference is reduced；When high current, high-voltage pulse occur at power cathode end, the forward conduction of diode 4,
Current direction power positive end, casing 5 is flowed to again by piezo-resistance, reduces power source internal pressure difference.So no matter when big electricity
The either end of power supply output occurs for stream, high-voltage pulse, and electric current can flow to casing 5, makes power supply its internal differential pressure control one
Determine in scope, the safe spacing reserved without departing from internal components when designing, ensure the stable work of power safety.
It is further understood that, the electric capacity 2 is electrochemical capacitor.Above-mentioned electric capacity 2 is electrochemical capacitor, and the electrochemical capacitor is solid
State aluminum design, solid-state aluminum electrochemical capacitor use range is wide, high temperature resistant, stability are good, service life length, is not susceptible to simultaneously
Explosion is so as to the safety of effective protection circuit.
Specifically understand, the resistance 3 is resistance variable resistor.The resistance of the resistance 3 can change, when being added in
When voltage above it is less than its threshold values " UN ", flow through that its electric current is minimum, equivalent to one valve shut, when voltage surpasses
When crossing UN, its resistance diminishes, so allow for flowing through its electric current increase sharply and the influence change to other circuits less so as to
Reduce influence of the overvoltage to follow-up sensitive circuit., can be excessively electric with the exception often occurred in suppression circuit using this function
Pressure, protects the circuit from the infringement of overvoltage.
Further, the resistance 3 is piezo-resistance.When the voltage being added in piezo-resistance is less than its threshold value, stream
Cross that its electric current is minimum, its infinitely great resistance 3 of equivalent to one resistance.That is, when the voltage being added in above it is less than
During its threshold value, its switch equivalent to an off-state.When the voltage being added in piezo-resistance exceedes its threshold value, flow through
Its electric current increases sharply, and it is equivalent to the infinitesimal resistance 3 of resistance.That is, when the voltage being added in above it is higher than its threshold value
When, its switch equivalent to a closure state.The exception that can effectively avoid often occurring in suppression circuit by the structure
Overvoltage, so as to protect the circuit from the infringement of overvoltage.
Specifically, the diode 4 is TVS diode.TVS (Transient Voltage Suppressor) two poles
Pipe, also known as Transient Suppression Diode, are a kind of new and effective circuit brakes generally used, and it has the response being exceedingly fast
Time (subnanosecond level) and at a relatively high surge absoption ability.When its both ends are subjected to the high energy impact events of moment, TVS can be with
Impedance value between both ends is changed into Low ESR by high speed from high impedance, to absorb an instantaneous large-current, its both ends
Voltage clamp one it is predetermined numerically, so as to protect circuit element below not impacted by high voltage transient spike.
The various embodiments described above are only preferred embodiments of the present utility model, in the art, every to be based on this reality
With the changes and improvements in new technique scheme, should not exclude outside the scope of protection of the utility model.
Claims (5)
1. a kind of surge protection circuit of power supply output line, it is characterised in that including electric capacity (2) and diode (4), the electric capacity
(2) and diode (4) is serially connected to form closed-loop path from beginning to end, is connected between electric capacity (2) positive pole and the diode (4)
There is resistance (3), the resistance (3) is also connected with casing (5)；The positive terminal connection input power (1) of the electric capacity (2) is just
Pole, the negative pole of the negative pole end connection input power (1) of the electric capacity (2), the negative pole end connection out-put supply of the diode (4)
Positive pole, the diode (4) positive terminal connection out-put supply negative pole.
2. surge protection circuit according to claim 1, it is characterised in that the electric capacity (2) is electrochemical capacitor.
3. surge protection circuit according to claim 1, it is characterised in that the resistance (3) is resistance variable resistor.
4. surge protection circuit according to claim 3, it is characterised in that the resistance (3) is piezo-resistance.
5. surge protection circuit according to claim 4, it is characterised in that the diode (4) is TVS diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720696963.9U CN206962439U (en) | 2017-06-15 | 2017-06-15 | A kind of surge protection circuit of power supply output line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720696963.9U CN206962439U (en) | 2017-06-15 | 2017-06-15 | A kind of surge protection circuit of power supply output line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206962439U true CN206962439U (en) | 2018-02-02 |
Family
ID=61379245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720696963.9U Active CN206962439U (en) | 2017-06-15 | 2017-06-15 | A kind of surge protection circuit of power supply output line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206962439U (en) |
-
2017
- 2017-06-15 CN CN201720696963.9U patent/CN206962439U/en active Active
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