CN209104802U - A kind of protection circuit - Google Patents
A kind of protection circuit Download PDFInfo
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- CN209104802U CN209104802U CN201822247799.0U CN201822247799U CN209104802U CN 209104802 U CN209104802 U CN 209104802U CN 201822247799 U CN201822247799 U CN 201822247799U CN 209104802 U CN209104802 U CN 209104802U
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Abstract
A kind of protection circuit provided by the utility model, first control circuit receive power input voltage, when power input voltage is less than first threshold voltage, carry out aerial drainage from first control circuit output end to surge bleeder circuit output the first control voltage；Second control circuit receives power output end voltage, when power output end voltage is less than second threshold voltage, carries out aerial drainage from second control circuit output end to surge bleeder circuit output the second control voltage；Third control circuit receives power input voltage and power output end voltage, when power input voltage or power output end voltage are greater than third threshold voltage, carries out aerial drainage from third control circuit output end to surge bleeder circuit output third control voltage.Based on above-mentioned circuit provided by the embodiment of the utility model, it can achieve the purpose that the input terminal of circuit and the surge protection of output end and from reversal connection negative pressure harm.
Description
Technical field
The utility model relates to field of circuit technology, more specifically to a kind of protection circuit.
Background technique
With the improvement of living standards, we will use various electric appliances in daily life, for example, TV, washing machine,
Mobile phone, plate etc., these electric appliances bring great convenience to us in daily life, but using these electric appliances when
It waits, can be potentially encountered surge voltage and is reversely connected the appearance of situation.
Surge is also surging, is just above the transient overvoltage of normal working voltage.Surge is occurred only millions of
A kind of violent pulse in/mono- second time, the case where causing surge have it is very much, as power grid meets with lightning stroke, industrial elevator disturbance
Power grid, short circuit, static discharge, charging cable hot plug, charging plug inferior etc. can all cause the generation of surge.The harm of surge
Be it is quite serious, if surge voltage is more than the ability to bear of device, directly device can be burnt, if multiple small surges due to
Build-up effect will lead to the decline of device performance and the shortening in service life.In addition to surge voltage, another kind damage device situation is
Reversal connection.Current direction when reversal connection will lead to current direction and electrical equipment normal work is on the contrary, damage electrical equipment.
In the prior art, same protection circuit can only realize surge protection or can only be anti-reverse, not can be implemented simultaneously anti-
Surge protection and anti-reverse.
Utility model content
In view of this, the utility model embodiment provides a kind of protection circuit, to realize input terminal and the output of circuit
The surge protection at end and the purpose endangered from reversal connection negative pressure.
To achieve the above object, the utility model embodiment provides the following technical solutions:
The utility model discloses a kind of protection circuits, comprising: first grid driving circuit, second grid driving circuit,
First control circuit, second control circuit, third control circuit and surge bleeder circuit；
The first end of the first grid driving circuit is connected with power input, second end and the surge bleeder circuit
It is connected；
The first end of the second grid driving circuit is connected with power output end, second end and surge aerial drainage electricity
Road is connected；
The first control circuit, for receiving power input voltage, when the power input voltage is less than first
When threshold voltage, from the first control circuit output end to surge bleeder circuit output the first control voltage, institute is controlled
It states surge bleeder circuit and carries out aerial drainage according to the first control voltage, export the first discharge current；
The second control circuit, for receiving power output end voltage, when the power output end voltage is less than second
When threshold voltage, from the second control circuit output end to surge bleeder circuit output the second control voltage, institute is controlled
It states surge bleeder circuit and carries out aerial drainage according to the second control voltage, export the second discharge current；
The third control circuit works as institute for receiving the power input voltage and the power output end voltage
When stating power input voltage or the power output end voltage greater than third threshold voltage, exported by the third control circuit
It holds to surge bleeder circuit output third control voltage, controls the surge bleeder circuit according to the third and control voltage
Aerial drainage is carried out, third discharge current is exported.
Preferably, the surge bleeder circuit, comprising: diode D1, diode D2, diode D3, transistor M1, crystal
Pipe M2 and transistor M3；
The first end of the transistor M1 is connected with the power input, second end respectively with the transistor M2
Two ends are connected with the second end of the transistor M3, control terminal respectively with the output end of the first control circuit and described first
The second end of gate driving circuit is connected；
The anode of the diode D1 is connected with the first end of the transistor M1, and the second of cathode and the transistor M1
End is connected；
The first end of the transistor M2 is connected with the power output end, control terminal respectively with the second control circuit
Output end be connected with the second end of the second grid driving circuit；
The anode of the diode D2 is connected with the first end of the transistor M2, and the second of cathode and the transistor M2
End is connected；
The first end of the transistor M3 is grounded, and control terminal is connected with the output end of the third control circuit；
The anode of the diode D3 is connected with the first end of the transistor M3, and the second of cathode and the transistor M3
End is connected.
Preferably, the first control circuit, comprising: diode Z3, zener diode Z4, resistance R2, diode D4 with
And transistor M4；
The plus earth of the diode Z3, cathode are connected with the cathode of the zener diode Z4；
Output end of the anode of the zener diode Z4 as the first control circuit drives with the first grid
The second end of circuit is connected, and is connected by the resistance R2 with the second end of the transistor M4；
The first end of the transistor M4 is connected with the power input, and the second of control terminal and the transistor M1
End is connected；
The anode of the diode D4 is connected with the first end of the transistor M4, and the second of cathode and the transistor M4
End is connected.
Preferably, the second control circuit, comprising: diode Z5, zener diode Z6, resistance R3, diode D5 with
And transistor M5；
The plus earth of the diode Z5, cathode are connected with the cathode of the zener diode Z6；
Output end of the anode of the zener diode Z6 as the second control circuit drives with the second grid
The second end of circuit is connected, and is connected by the resistance R3 with the second end of the transistor M5；
The first end of the transistor M5 is connected with the power input, and the second of control terminal and the transistor M2
End is connected；
The anode of the diode D5 is connected with the first end of the transistor M5, and the second of cathode and the transistor M5
End is connected.
Preferably, the third control circuit, comprising: diode Z1, zener diode Z2, resistance R1；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, the yin of anode and the diode D1
Extremely it is connected；
Output end of the anode of the zener diode Z2 as the third control circuit, is connect by the resistance R1
Ground.A kind of protection circuit provided by the embodiment of the utility model, first control circuit receives power input voltage, when power supply is defeated
It is electric from first control circuit output end to the first control of surge bleeder circuit output when entering to hold voltage to be less than first threshold voltage
Pressure, control surge bleeder circuit control voltage according to first and carry out aerial drainage；Second control circuit receives power output end voltage, when
When power output end voltage is less than second threshold voltage, controlled from second control circuit output end to surge bleeder circuit output second
Voltage processed, control surge bleeder circuit control voltage according to second and carry out aerial drainage；Third control circuit receives power input electricity
Pressure and power output end voltage, when power input voltage or power output end voltage are greater than third threshold voltage, by third
Control circuit output end controls voltage to surge bleeder circuit output third, and control surge bleeder circuit controls voltage according to third
Carry out aerial drainage.Based on above-mentioned circuit provided by the embodiment of the utility model, the input terminal of circuit and the wave of output end can be reached
Gush the purpose protected and endangered from reversal connection negative pressure.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of effect picture for protecting circuit provided by the embodiment of the utility model；
Fig. 3 is a kind of circuit diagram for protecting circuit provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
Based on the above background, the utility model embodiment provides following suitable for surge protection and reverse-connection preventing circuit, thus
The prior art is solved the problems, such as in a circuit while realizing surge protection and anti-reverse.
As shown in Figure 1, for a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model, comprising:
First grid driving circuit 101, second grid driving circuit 102, first control circuit 103, second control circuit
104, third control circuit 105 and surge bleeder circuit 106.
The first end of the first grid driving circuit 101 is connected with power input, second end and the surge aerial drainage
Circuit 106 is connected.
It should be noted that first grid driving circuit 101 plays on-off action for controlling in surge bleeder circuit 106
Component, for making it when input voltage belongs to normal range of operation, i.e., input voltage is positive voltage, and is less than third and controls
Voltage exports the first driving voltage, controls the channel conducting that component is corresponded in the surge bleeder circuit 106.The prior art
It is middle there are a variety of circuits that this function may be implemented, can be used as the first grid driving circuit 101 herein, no matter with assorted
Circuit is as the first grid driving circuit 101, as long as the function of can be realized the first grid driving circuit 101 is equal
It can be considered within the protection scope of the utility model.
The first end of the second grid driving circuit 102 is connected with power output end, second end and the surge aerial drainage
Circuit 106 is connected.
It should be noted that second grid driving circuit 102 plays switch work for controlling in the surge bleeder circuit 106
Component, for making it when input voltage belongs to normal range of operation, i.e., output voltage is positive voltage, and is less than third
Voltage is controlled, the second driving voltage is exported, controls the channel conducting for corresponding to component in the surge bleeder circuit 106.It is existing
There are a variety of circuits that this function may be implemented in technology, no matter the second grid driving circuit 102 herein can be used as
Using what circuit as the second grid driving circuit 102, as long as can be realized the function of the second grid driving circuit 102
It can be considered within the protection scope of the utility model.
It should be noted that power output end can take over the charging chip etc. inside machine or plate.
The first control circuit 103, for receiving power input voltage, when the power input voltage is less than
It is electric from 103 output end of first control circuit to the first control of the surge bleeder circuit 106 output when one threshold voltage
Pressure controls the surge bleeder circuit 106 according to the first control voltage and carries out aerial drainage, exports the first discharge current.
The second control circuit 104, for receiving power output end voltage, when the power output end voltage is less than
It is electric from 104 output end of second control circuit to the second control of the surge bleeder circuit 106 output when two threshold voltages
Pressure controls the surge bleeder circuit 106 according to the second control voltage and carries out aerial drainage, exports the second discharge current.
The third control circuit 105, for receiving the power input voltage and the power output end voltage, when
When the power input voltage or the power output end voltage are greater than third threshold voltage, by the third control circuit
105 output ends control voltage to the surge bleeder circuit 106 output third, control the surge bleeder circuit 106 according to institute
It states third control voltage and carries out aerial drainage, export third discharge current.
The surge bleeder circuit 106, for being carried out to the power input voltage according to the first control voltage
Aerial drainage, and export the first discharge current；According to the second control voltage, aerial drainage is carried out to the power input voltage, it is defeated
Second discharge current out；And voltage is controlled according to the third, to the power input voltage and the power output end
Voltage carries out aerial drainage, exports third discharge current.
In a kind of protection circuit provided by the embodiment of the utility model, first control circuit receives power input voltage,
When the power input voltage is less than first threshold voltage, from the first control circuit output end to the surge aerial drainage
Circuit output first controls voltage, and control surge bleeder circuit controls voltage according to first and carries out aerial drainage；Second control circuit connects
Power output end voltage is received, it is defeated by the second control circuit when the power output end voltage is less than second threshold voltage
Outlet controls voltage according to second and carries out aerial drainage to surge bleeder circuit output the second control voltage, control surge bleeder circuit；
Third control circuit receives the power input voltage and the power output end voltage, when the power input voltage or
It is defeated from the third control circuit output end to surge bleeder circuit when the power output end voltage is greater than third threshold voltage
Third controls voltage out, and control surge bleeder circuit carries out aerial drainage according to third control voltage.It is real based on above-mentioned the utility model
The circuit for applying example offer can reach the input terminal of circuit and the surge protection of output end and the mesh from reversal connection negative pressure harm
's.
A kind of effect picture for protecting circuit provided by the embodiment of the utility model, as shown in Fig. 2, surge voltage and plus protection
Voltage signal after device, dotted line are surge voltage, and surge voltage temporarily, to be increased in a short period of time very high
Voltage, if not protecting device, the port devices for encountering surge voltage can be burned.Increasing has surge protection function
IC, when surge voltage temporarily, to be released by surge protection IC, while port voltage clamper to be protected being made in Vclamp
The voltage in the safe range that port can be born is obtained, to protect the safety of charging interface and electronic equipment.
It should be noted that increasing device of surge protector in charging port in order to avoid surge voltage damages electronic equipment.
Can have to a ground TVS Transient Suppression Diode in parallel, or in charging port using one in electronic equipment charging port
There is the electronic device IC (Integrated Circuit, IC) of surge protection function.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 3, being provided by the embodiment of the utility model
A kind of embodiment of surge bleeder circuit 304 in a kind of protection circuit, the surge bleeder circuit 304 include: diode D1,
Diode D2, diode D3, transistor M1, transistor M2 and transistor M3.
The first end of the transistor M1 is connected with the power input, second end respectively with the transistor M2
Two ends are connected with the second end of the transistor M3, control terminal respectively with the output end of the first control circuit and described first
The second end of gate driving circuit is connected.
It should be noted that the transistor M1 can be metal-oxide-semiconductor, wherein first end is source electrode, and second end is drain electrode,
Control terminal is grid.Further, the transistor M1 is NMOS tube.
The anode of the diode D1 is connected with the first end of the transistor M1, and the second of cathode and the transistor M1
End is connected.
It should be noted that the diode D1 can be the parasitic body diode of the transistor M1, it is also possible to general
Logical diode.
The first end of the transistor M2 is connected with the power output end, control terminal respectively with the second control circuit
Output end be connected with the second end of the second grid driving circuit.
It should be noted that the transistor M2 can be metal-oxide-semiconductor, wherein first end is source electrode, and second end is drain electrode,
Control terminal is grid.Further, the transistor M2 is NMOS tube.
The anode of the diode D2 is connected with the first end of the transistor M2, and the second of cathode and the transistor M2
End is connected.
It should be noted that the diode D2 can be the parasitic body diode of the transistor M2, it is also possible to general
Logical diode.
The first end of the transistor M3 is grounded, and control terminal is connected with the output end of the third control circuit.
It should be noted that the transistor M3 can be metal-oxide-semiconductor, wherein first end is source electrode, and second end is drain electrode,
Control terminal is grid.Further, the transistor M3 is NMOS tube.
The anode of the diode D3 is connected with the first end of the transistor M3, and the second of cathode and the transistor M3
End is connected.
It should be noted that the diode D3 can be the parasitic body diode of the transistor M3, it is also possible to general
Logical diode.
A kind of protection circuit provided by the embodiment of the utility model, first control circuit receive power input voltage, when
It is electric from the first control circuit output end to the surge aerial drainage when power input voltage is less than first threshold voltage
Road output the first control voltage, control surge bleeder circuit control voltage according to first and carry out aerial drainage；Second control circuit receives
Power output end voltage is exported when the power output end voltage is less than second threshold voltage by the second control circuit
It holds to surge bleeder circuit output the second control voltage, control surge bleeder circuit controls voltage according to second and carries out aerial drainage；The
Three control circuits receive power input voltage and power output end voltage, when the power input voltage or the power supply are defeated
When outlet voltage is greater than third threshold voltage, controlled from the third control circuit output end to surge bleeder circuit output third
Voltage, control surge bleeder circuit carry out aerial drainage according to third control voltage.Based on above-mentioned provided by the embodiment of the utility model
Circuit can achieve the purpose that the input terminal of circuit and the surge protection of output end and from reversal connection negative pressure harm.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 3, being provided by the embodiment of the utility model
A kind of embodiment of first control circuit 301 in a kind of protection circuit, the first control circuit 301 include: diode Z3,
Zener diode Z4, resistance R2, diode D4 and transistor M4.
The plus earth of the diode Z3, cathode are connected with the cathode of the zener diode Z4.
It should be noted that the diode Z3 can be common diode, or zener diode, preferably
, it is general-purpose diode in the present embodiment.
Output end of the anode of the zener diode Z4 as the first control circuit drives with the first grid
The second end of circuit is connected, and is connected by the resistance R2 with the second end of the transistor M4.
The first end of the transistor M4 is connected with the power input, and the second of control terminal and the transistor M1
End is connected.
It should be noted that the transistor M4 can be metal-oxide-semiconductor, wherein first end is source electrode, and second end is drain electrode,
Control terminal is grid.Further, the transistor M4 is NMOS tube.
The anode of the diode D4 is connected with the first end of the transistor M4, and the second of cathode and the transistor M4
End is connected.
It should be noted that the diode D4 can be the parasitic body diode of the transistor M4, or general
Logical diode.
A kind of protection circuit provided by the embodiment of the utility model, first control circuit receive power input voltage, when
It is electric from the first control circuit output end to the surge aerial drainage when power input voltage is less than first threshold voltage
Road output the first control voltage, control surge bleeder circuit control voltage according to first and carry out aerial drainage.It is practical new based on above-mentioned
The circuit that type embodiment provides can achieve the purpose that the surge protection of the input terminal of circuit and from reversal connection negative pressure harm.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 3, being provided by the embodiment of the utility model
A kind of embodiment of second control circuit 302 in a kind of protection circuit, the second control circuit 302 include: diode Z5,
Zener diode Z6, resistance R3, diode D5 and transistor M5.
The plus earth of the diode Z5, cathode are connected with the cathode of the zener diode Z6.
Output end of the anode of the zener diode Z6 as the second control circuit drives with the second grid
The second end of circuit is connected, and is connected by the resistance R3 with the second end of the transistor M5.
The first end of the transistor M5 is connected with the power input, and the second of control terminal and the transistor M2
End is connected.
It should be noted that the transistor M5 can be metal-oxide-semiconductor, wherein first end is source electrode, and second end is drain electrode,
Control terminal is grid.Further, the transistor M5 is NMOS tube.
The anode of the diode D5 is connected with the first end of the transistor M5, and the second of cathode and the transistor M5
End is connected.
It should be noted that the diode D5 can be the parasitic body diode of the transistor M5, or general
Logical diode.
A kind of protection circuit provided by the embodiment of the utility model, second control circuit receive power output end voltage, when
It is defeated from the second control circuit output end to surge bleeder circuit when the power output end voltage is less than second threshold voltage
Second control voltage out, control surge bleeder circuit control voltage according to second and carry out aerial drainage.It is real based on above-mentioned the utility model
The circuit for applying example offer can achieve the purpose that the surge protection of the output end of circuit and from reversal connection negative pressure harm.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 3, being provided by the embodiment of the utility model
A kind of embodiment of third control circuit 303 in a kind of protection circuit, the third control circuit 303 include: diode Z1,
Zener diode Z2, resistance R1；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, the yin of anode and the diode D1
Extremely it is connected；
It should be noted that the diode Z1 can be common diode, or zener diode, preferably
, it is general-purpose diode in the present embodiment.
Output end of the anode of the zener diode Z2 as the third control circuit, is connect by the resistance R1
Ground.
A kind of protection circuit provided by the embodiment of the utility model, third control circuit receive power input voltage and electricity
Source output terminal voltage, when the power input voltage or the power output end voltage are greater than third threshold voltage, by institute
Third control circuit output end is stated to surge bleeder circuit output third control voltage, control surge bleeder circuit is according to third control
Voltage processed carries out aerial drainage.Based on above-mentioned circuit provided by the embodiment of the utility model, input terminal and the output of circuit can be reached
The surge protection at end and the purpose endangered from reversal connection negative pressure.
A kind of protection circuit in conjunction with disclosed in above-described embodiment, in conjunction with Fig. 3, a kind of guarantor disclosed in the utility model embodiment
The specific application example of protection circuit is as follows:
Transistor M1, transistor M2, transistor M3, transistor M4 and transistor M5 are all made of the NMOS that cut-in voltage is 1V
Pipe, transistor M1, transistor M2, transistor M3 threshold voltage be respectively Vth_M1, Vth_M2 and Vth_M3.
Zener diode Z2, zener diode Z4 and zener diode Z6 are all made of the pressure stabilizing that breakdown reverse voltage is 10V
Diode, it is 0.7V that diode Z1, zener diode Z3 and diode Z5, which are all made of forward conduction voltage, and breakdown reverse voltage is big
In the general-purpose diode of 30V, breakdown reverse voltage is respectively VBR_Z1 to VBR_Z6.
Normal condition:
For input voltage VIN in normal range (NR), first grid driving circuit and second grid driving circuit are by transistor M1
It being connected with transistor M2, charging current can flow there through VOUT from the channel of transistor M1 and transistor M2, and transistor M3 is turned off,
Circuit work is not influenced.
When circuit does not work, transistor M1, transistor M2 and transistor M3 are turned off, due to diode D1 and diode
D2 is contrary, is two-way isolation between VIN and VOUT, will not leak electricity from one end to the other side.
VIN reverse connecting protection:
When electric voltage reverse-connection, i.e. when the DC voltage that VIN is negative, transistor M1, transistor M2 and transistor M3 are turned off,
Since the diode D1 of transistor M1 is to be directed toward VOUT from VIN, when VIN is negative voltage, diode D1 is reverse-biased, and MID and VOUT are
It not will become negative voltage, the electronic device at the end VOUT protected not can be appreciated that negative pressure.The minimum negative pressure that the circuit can be born be-
(0.7+VBR_Z4+Vth_M1)。
The protection of VIN positive surge:
When positive surge voltage comes temporarily, first grid driving circuit closes transistor M1, but the diode of transistor M1
Surge voltage is transmitted to MID by D1.Diode Z1, zener diode Z2 and resistance R1 constitute the driving electricity of transistor M3 together
Road.As VIN > 0.7+VBR_Z2+Vth_M3, transistor M3 is opened, and the voltage clamping of MID point is lived, positive surge voltage is passed through
The channel of diode D1 and transistor M3 are released to ground, as VIN < 0.7+VBR_Z2+Vth_M3, transistor M3 shutdown.
VIN voltage is timing, and voltage can be transmitted to the grid of transistor M1 by diode D4 and resistance R2, due to two poles
Pipe Z3 is reverse-biased, as long as the breakdown reverse voltage of diode Z3 is enough, diode Z3 and the path zener diode Z4 will not
Electric leakage.First grid driving circuit can normally open or close transistor M1, not by diode Z3, zener diode Z4,
The interference of resistance R2 and transistor M4.
The negative surge protection of VIN:
Diode Z3, zener diode Z4, resistance R2 and transistor M4 together form transistor M1 release negative surge when
Driving circuit.When VIN is negative, D1 is reverse-biased, and since diode D3 is directed toward MID from GND, MID point at most becomes -0.7V,
It will not reduce, be lived by diode D3 clamper again.As long as VIN ratio MID low Vth_M4, M4 meet VGS_M4=MID-VIN >
Vth_M4, i.e. transistor M4 are turned on.If VIN continues to reduce, to VIN <-(0.7+VBR_Z4+Vth_M1) when, transistor M1's
Channel conducting, VIN clamper is lived, the negative surge voltage of VIN is released through the channel of diode D3 and transistor M1.
When VIN voltage is negative, diode Z1 is reverse-biased, as long as the breakdown reverse voltage of diode Z1 is sufficiently high, diode
Z1 and the path zener diode Z2 will not leak electricity.
VOUT reverse connecting protection and positive and negative surge protection:
Since the driving circuit of transistor M2 is as the driving circuit of transistor M1, the protection philosophy at the end VOUT is same
The protection philosophy at the end VIN is identical.
In conclusion the DC voltage range that the utility model circuit VIN can bear is-(0.7+ VBR_Z4+Vth_
M1) < VIN < 0.7+VBR_Z2+Vth_M3, by be arranged VBR_Z2 and VBR_Z4 value can control circuit VIN can bear
DC voltage range and start to carry out the starting point of positive and negative surge protection.The DC voltage range that VOUT can bear is-(0.7
+ VBR_Z6+ Vth_M2) < VIN < 0.7+VBR_Z2+Vth_M3, the value by the way that VBR_Z2 and VBR_Z6 is arranged can control circuit
The DC voltage range and start to carry out the starting point of positive and negative surge protection that VOUT can be born.
It should be noted that the utility model can be applied to charging interface, can be used for other need it is anti-reverse and
The port of surge protection.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of the utility model.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (5)
1. a kind of protection circuit characterized by comprising first grid driving circuit, second grid driving circuit, the first control
Circuit, second control circuit, third control circuit and surge bleeder circuit；
The first end of the first grid driving circuit is connected with power input, second end and the surge bleeder circuit phase
Even；
The first end of the second grid driving circuit is connected with power output end, second end and the surge bleeder circuit phase
Even；
The first control circuit, for receiving power input voltage, when the power input voltage is less than first threshold
When voltage, from the first control circuit output end to surge bleeder circuit output the first control voltage, the wave is controlled
It gushes bleeder circuit and carries out aerial drainage according to the first control voltage, export the first discharge current；
The second control circuit, for receiving power output end voltage, when the power output end voltage is less than second threshold
When voltage, from the second control circuit output end to surge bleeder circuit output the second control voltage, the wave is controlled
It gushes bleeder circuit and carries out aerial drainage according to the second control voltage, export the second discharge current；
The third control circuit, for receiving the power input voltage and the power output end voltage, when the electricity
When source input terminal voltage or the power output end voltage are greater than third threshold voltage, from the third control circuit output end to
The surge bleeder circuit output third controls voltage, controls the surge bleeder circuit and carries out according to third control voltage
Aerial drainage exports third discharge current.
2. circuit according to claim 1, which is characterized in that the surge bleeder circuit, comprising: diode D1, two poles
Pipe D2, diode D3, transistor M1, transistor M2 and transistor M3；
The first end of the transistor M1 is connected with the power input, the second end second end with the transistor M2 respectively
Be connected with the second end of the transistor M3, control terminal respectively with the output end of the first control circuit and the first grid
The second end of driving circuit is connected；
The anode of the diode D1 is connected with the first end of the transistor M1, the second end phase of cathode and the transistor M1
Even；
The first end of the transistor M2 is connected with the power output end, and control terminal is defeated with the second control circuit respectively
Outlet is connected with the second end of the second grid driving circuit；
The anode of the diode D2 is connected with the first end of the transistor M2, the second end phase of cathode and the transistor M2
Even；
The first end of the transistor M3 is grounded, and control terminal is connected with the output end of the third control circuit；
The anode of the diode D3 is connected with the first end of the transistor M3, the second end phase of cathode and the transistor M3
Even.
3. circuit according to claim 2, which is characterized in that the first control circuit, comprising: diode Z3, pressure stabilizing
Diode Z4, resistance R2, diode D4 and transistor M4；
The plus earth of the diode Z3, cathode are connected with the cathode of the zener diode Z4；
Output end of the anode of the zener diode Z4 as the first control circuit, with the first grid driving circuit
Second end be connected, and be connected by the resistance R2 with the second end of the transistor M4；
The first end of the transistor M4 is connected with the power input, the second end phase of control terminal and the transistor M1
Even；
The anode of the diode D4 is connected with the first end of the transistor M4, the second end phase of cathode and the transistor M4
Even.
4. circuit according to claim 2, which is characterized in that the second control circuit, comprising: diode Z5, pressure stabilizing
Diode Z6, resistance R3, diode D5 and transistor M5；
The plus earth of the diode Z5, cathode are connected with the cathode of the zener diode Z6；
Output end of the anode of the zener diode Z6 as the second control circuit, with the second grid driving circuit
Second end be connected, and be connected by the resistance R3 with the second end of the transistor M5；
The first end of the transistor M5 is connected with the power input, the second end phase of control terminal and the transistor M2
Even；
The anode of the diode D5 is connected with the first end of the transistor M5, the second end phase of cathode and the transistor M5
Even.
5. circuit according to claim 2, which is characterized in that the third control circuit, comprising: diode Z1, pressure stabilizing
Diode Z2, resistance R1；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, the cathode phase of anode and the diode D1
Even；
Output end of the anode of the zener diode Z2 as the third control circuit is grounded by the resistance R1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247799.0U CN209104802U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247799.0U CN209104802U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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| CN209104802U true CN209104802U (en) | 2019-07-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449910A (en) * | 2018-12-26 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
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2018
- 2018-12-26 CN CN201822247799.0U patent/CN209104802U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449910A (en) * | 2018-12-26 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109449910B (en) * | 2018-12-26 | 2023-11-21 | 上海艾为电子技术股份有限公司 | Protection circuit |
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