CN209104803U - A kind of protection circuit - Google Patents
A kind of protection circuit Download PDFInfo
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- CN209104803U CN209104803U CN201822274839.0U CN201822274839U CN209104803U CN 209104803 U CN209104803 U CN 209104803U CN 201822274839 U CN201822274839 U CN 201822274839U CN 209104803 U CN209104803 U CN 209104803U
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Abstract
A kind of protection circuit provided by the utility model; control circuit receives input voltage; when input voltage is less than negative threshold voltage; control circuit controls voltage from its first output end to surge bleeder circuit output first; it controls surge bleeder circuit and aerial drainage is carried out to input voltage, export the first discharge current；When input voltage is greater than positive threshold voltage, from its second output terminal to surge bleeder circuit output the second control voltage, control surge bleeder circuit carries out aerial drainage to the input voltage, exports the second discharge current control circuit；Based on above-mentioned circuit provided by the embodiment of the utility model, the electronic component of protection power source rear class can be achieved the purpose that from surge voltage and reversal connection negative pressure harm.
Description
Technical field
The utility model relates to electroporation field more particularly to a kind of protection circuits.
Background technique
It since " electricity " is found, has just been widely used in all trades and professions, " electricity " greatly changes the work of people
And life style.Nowadays, that does not exaggerate says, the every aspect of present people's life all be unable to do without " electricity ", greatly to computer electricity
Depending on light bulb small to mobile requires electricity consumption.
But TV and this interior operating voltage containing certain components in the high integrated circuit board of integrated level of mobile phone
There is a fixed range, once overtension or brownout may all damage this component, such as the most common reversal connection
And surge voltage, although the appearance of surge voltage is often that in a flash, due to overtension, thus can easily damage
Bad electrical appliance, and be reversely connected and then will lead to current direction with current direction when electrical appliance normal work on the contrary, also can easily damage
Bad electrical appliance.
The appearance of surge voltage and reversal connection has no idea to avoid completely, we can only take effective mode to protect some use
Electric appliance is from surge voltage or the harm of reversal connection.Surge voltage be divided into it is positive and negative, still, in the prior art, protection circuit often
It can only realize positive surge protection or negative surge protection, can not comprehensively realize surge protection according to two different circuits
Realize the two functions respectively, it is excessively complicated to will result in circuit, will cause that electrical appliance is excessive, and will also result in resource
Waste.
Therefore, how to realize that reverse connecting protection and surge protection become a kind of very important problem in a circuit.
Utility model content
In view of this, the utility model embodiment provides a kind of protection circuit, to realize reverse connecting protection and surge protection.
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,
Transistor M2, diode D2, 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 transistor M2 is connected with power output end, control terminal and the second grid driving circuit phase
Even, second end is connected with the surge bleeder 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 second grid driving circuit is connected with the power output end, second end with the transistor
The control terminal of M2 is connected；
The surge bleeder circuit includes:
Transistor M1, transistor M3, diode D1 and diode D3；
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 first output end of the control circuit and described first
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 M3 is grounded, and control terminal is connected with the second output terminal of the 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.
The control circuit includes:
Resistance R1, resistance R2, transistor M4, diode D4, diode Z1, diode Z3, zener diode Z2 and pressure stabilizing
Diode Z4；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, anode and the power input phase
Even；
The anode of the zener diode Z2 is grounded as the control circuit second output terminal by the resistance R1；
The first end of the transistor M4 is connected with the power input, and second end passes through the resistance R2 and the control
First output end of circuit processed is connected, and control terminal is connected with the cathode of the diode D3；
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；
The cathode of the diode Z3 is connected with the cathode of the zener diode Z4, and the anode of the diode Z3 connects
Ground；
The anode of the zener diode Z4 is connected with the first output end of the control circuit.
Based on a kind of above-mentioned protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when defeated
When entering voltage less than negative threshold voltage, control circuit controls voltage from its first output end to surge bleeder circuit output first,
It controls surge bleeder circuit and aerial drainage is carried out to input voltage, export the first discharge current；When input voltage is greater than positive threshold voltage
When, control circuit controls surge bleeder circuit to institute from its second output terminal to surge bleeder circuit output the second control voltage
It states input voltage and carries out aerial drainage, export the second discharge current；When input voltage is positive voltage, and is less than positive threshold voltage,
First grid driving circuit provides the first driving voltage to control circuit, and second grid driving circuit provides the second driving voltage,
Surge bleeder circuit is the late-class circuit power supply that is connected with power output end according to the first driving voltage and the second driving voltage.It is based on
Above-mentioned circuit provided by the embodiment of the utility model can reach the electronic component of protection power source rear class from surge voltage and anti-
Connect the purpose of negative pressure harm.
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 effect picture for protecting circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram 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.
Currently, the existing protection circuit applied to integrated circuit can only often realize reverse connecting protection or surge protection,
Reverse connecting protection and surge protection cannot be realized in the same circuit, realize the two respectively according to two different circuits
Function, it is excessively complicated to will result in circuit, will cause that electrical appliance is excessive, and will also result in the waste of resource.
In view of the above-mentioned problems, the utility model is that embodiment provides a kind of protection circuit, the protection circuit is set to
Between power supply and need circuit to be protected；The effect for protecting circuit, as shown in Figure 1, capableing of the electronics of protection power source rear class
Element provides a normal working range from the harm of surge voltage and reversal connection negative pressure for the electronic component of power supply rear class
Voltage.Such as protection circuit is set between charger and charging interface, charger is power supply, is connected with power input
It connects；Charging interface and battery are charge power supply, are connect with power output end, by protecting electricity disclosed in the utility model embodiment
The charging of road direction charging interface is guaranteed that the operating voltage of charging interface is normal operating voltage by protection circuit, to play guarantor
Protect the purpose of charging interface and the subsequent battery of charging interface.
The specific implementation of the utility model is described below for protection electrical block diagram.
As shown in Fig. 2, for a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model, comprising:
First grid driving circuit 301, second grid driving circuit 302, transistor M2, diode D2, control circuit 303
With surge bleeder circuit 304.
The first end of the first grid driving circuit 301 is connected with power input, second end and the surge aerial drainage
Circuit 304 is connected.
It should be noted that the first grid driving circuit 301 rises out in the surge bleeder circuit 304 for controlling
The component of pass effect, for making it when input voltage belongs to normal range of operation, i.e., input voltage is positive voltage, and is less than
Positive threshold voltage exports the first driving voltage, controls the channel conducting that component is corresponded in surge bleeder circuit.In the prior art
A variety of circuits that this function may be implemented, can be used as first grid driving circuit herein, no matter using what circuit as
One gate driving circuit, as long as the function of can be realized the first grid driving circuit can be considered the protection of the utility model
Within the scope of.
The first end of the transistor M2 is connected with the power output end, control terminal and the second grid driving circuit
It is connected.
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
End processed is grid, and further, the transistor M2 can be NMOS tube.Second driving voltage is opened greater than the transistor M2's
Open voltage.
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, or general
Logical diode.
The first end of the second grid driving circuit 302 is connected with the power output end, second end and the crystal
The control terminal of pipe M2 is connected.
It should be noted that the second grid driving circuit 302 is used to control the transistor M2, for making it defeated
When entering voltage and belonging to normal range of operation, i.e., input voltage is positive voltage, and is less than positive threshold voltage, output the second driving electricity
Pressure, the channel conducting of transistor M2.A variety of circuits that this function may be implemented exist in the prior art, can be used as herein
As long as no matter two gate driving circuits can be realized the second grid drive using what circuit as second grid driving circuit
The function of dynamic circuit can be considered within the protection scope of the utility model.
The control circuit 303, for receiving input voltage, and when the input voltage is less than preset negative threshold voltage
When, from its first output end to surge bleeder circuit output the first control voltage, control the surge bleeder circuit foundation
The first control voltage carries out aerial drainage, exports the first discharge current；When the input voltage is greater than preset positive threshold voltage
When, from its second output terminal to surge bleeder circuit output the second control voltage, control the surge bleeder circuit foundation
The second control voltage carries out aerial drainage, exports the second discharge current.
Wherein, the voltage value of the negative threshold voltage is negative value, for judging whether input voltage is negative surge voltage；Institute
The voltage value for stating positive threshold voltage is positive value, for judging whether input voltage is positive surge voltage.
In addition, the first control voltage and the second control voltage are used to control the on-off action that plays in surge bleeder circuit
Component.
When input voltage is less than negative threshold voltage, output the first control voltage；When input voltage is greater than positive threshold voltage
When, output the second control voltage.
It should be noted that input voltage refers to that the potential of power input subtracts the obtained potential of potential on ground
Difference, when the voltage of power input is greater than the voltage on ground, the input voltage is positive voltage, when the voltage of power input is small
When the voltage on ground, the input voltage is negative voltage.Threshold voltage, can for determining whether input voltage is surge voltage
By selecting the component of appropriate size to determine corresponding threshold voltage.
The surge bleeder circuit 304, for carrying out aerial drainage to the input voltage according to the first control voltage,
And export the first discharge current；And according to the second control voltage, aerial drainage is carried out to the input voltage, output second is let out
Galvanic electricity stream.
Further, it is also used to power according to the second end that first driving voltage is transistor M2, as transistor M2
When according to the conducting of the second driving voltage, surge bleeder circuit 304 and M2 pairs of the transistor circuit power supply being connected with power output end,
Output services electric current.
Wherein, when surge bleeder circuit 304 receives the first control voltage, input voltage is negative surge voltage, to negative
Surge voltage carries out aerial drainage.
When surge bleeder circuit 304 receives the second control voltage, input voltage is positive surge voltage, to positive surge electricity
Pressure carries out aerial drainage.
When surge bleeder circuit 304 receives the first driving voltage and the second driving voltage, input voltage is normal work
Make voltage, exports running current.
A kind of protection circuit provided by the embodiment of the utility model, control circuit 303 receive input voltage, work as input voltage
When less than negative threshold voltage, control circuit 303 controls voltage from its first output end to the output of surge bleeder circuit 304 first,
It controls surge bleeder circuit 304 and aerial drainage is carried out to input voltage, export the first discharge current；When input voltage is greater than positive threshold value electricity
When pressure, control circuit 303 controls surge aerial drainage from its second output terminal to the output of surge bleeder circuit 304 second control voltage
Circuit 304 carries out aerial drainage to the input voltage, exports the second discharge current；When input voltage be positive voltage, and be less than just
When threshold voltage, first grid driving circuit provides the first driving voltage to surge aerial drainage, and second grid driving circuit is to crystal
Pipe M2 provides the second driving voltage, and surge bleeder circuit is according to the first driving voltage and transistor M2 according to the second driving voltage
For the late-class circuit power supply that is connected with power output end.Based on above-mentioned circuit provided by the embodiment of the utility model, guarantor can be reached
Protect purpose of the electronic component from surge voltage and reversal connection negative pressure harm of power supply rear class.
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: transistor M1,
Transistor M3, diode D1 and diode D3.
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 first output end of the control circuit and described first
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
End processed is grid, and further, the transistor M1 can be NMOS tube.First driving voltage and the first control voltage are greater than crystalline substance
The cut-in voltage of body pipe M1.
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 transistor M1, or common
Diode.
The second end of the transistor M3 is grounded, and control terminal is connected with the second output terminal of the 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
End processed is grid, and further, the transistor M3 can be NMOS tube.Second control voltage opening greater than the transistor M3
Open voltage.
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, or general
Logical diode.
A kind of protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when input voltage is small
When negative threshold voltage, control circuit controls surge from its first output end to surge bleeder circuit output the first control voltage
Bleeder circuit carries out aerial drainage to input voltage, exports the first discharge current；When input voltage is greater than positive threshold voltage, control electricity
Its second output terminal is routed to surge bleeder circuit output the second control voltage, controls surge bleeder circuit to the input voltage
Aerial drainage is carried out, the second discharge current is exported；When input voltage is positive voltage, and is less than positive threshold voltage, first grid is driven
Dynamic circuit provides the first driving voltage to surge bleeder circuit, and second grid driving circuit provides the second driving electricity to transistor M2
Pressure, surge bleeder circuit are to be connected with power output end according to the second driving voltage according to the first driving voltage and transistor M2
Late-class circuit power supply.Based on above-mentioned circuit provided by the embodiment of the utility model, the electronics member of protection power source rear class can be reached
Purpose of the part from surge voltage and reversal connection negative pressure harm.
Further, when input voltage is less than preset negative threshold voltage, the control terminal of transistor M1 receives the first control
Voltage processed, the channel conducting of transistor M1, the input of negative surge voltage will be belonged to by the channel and diode D3 of transistor M1
Voltage is released to ground, the subsequent circuit of protection power source output end and component from the harm of negative surge voltage.When input electricity
When pressure is greater than preset positive threshold voltage, the control terminal of transistor M3 receives the second control voltage, and the channel of transistor M3 is connected,
The input voltage for belonging to positive surge voltage is released to ground by the channel and diode D1 of transistor M3.When input voltage is
Positive voltage and be less than positive threshold voltage when, transistor M1 receive the first driving voltage, transistor M1 channel conducting, transistor
M2 receive the second driving voltage, transistor M2 channel conducting, input voltage via transistor M1 channel and M2 channel to
Power output end power supply, output services electric current.When input voltage is negative voltage, and is greater than negative threshold voltage, that is, circuit
When reversal connection, surge bleeder circuit does not receive control voltage and driving voltage, and the channel of transistor M2 does not turn on, to protect electricity
Circuit or component after source output terminal not will receive the harm of reversal connection negative pressure.
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 control circuit 303 in a kind of protection circuit, the control circuit 303 includes: resistance R1, resistance R2, crystalline substance
Body pipe M4, diode D4, diode Z1, diode Z3, zener diode Z2 and zener diode Z4；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, anode and the power input phase
Even；
It should be noted that the diode Z1 is for receiving input voltage, the anode of the diode Z1 can also lead to
It crosses the diode D1 to be connected with power input, that is to say, that the anode of the two pole pipe Z1 can be with two pole
The cathode of pipe D1 is connected, and receives input voltage by the diode D1.
The anode of the zener diode Z2 is connect as 303 second output terminal of control circuit by the resistance R1
Ground；
It should be noted that the quantity of the zener diode Z2 can be one, or it is multiple, it can be by setting
It sets the zener diode Z2 and positive threshold voltage is set.The anode of the diode Z3 is the second defeated of the control circuit 303
Outlet, for exporting the second control voltage.
The first end of the transistor M4 is connected with the power input, and second end passes through the resistance R2 and the control
First output end of circuit processed is connected, and control terminal is connected with the cathode of the diode D3；
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.
The cathode of the diode Z3 is connected with the cathode of the zener diode Z4, and the anode of the diode Z3 connects
Ground；
The anode of the zener diode Z4 is connected with the first output end of the control circuit.
It should be noted that the quantity of the zener diode Z4 can be one, or it is multiple, it can be by setting
Set the zener diode Z4 setting negative threshold voltage.The anode of the zener diode Z4 is the of the control circuit 303
One output end, for exporting the first control voltage.
A kind of protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when input voltage is small
When negative threshold voltage, control circuit controls surge from its first output end to surge bleeder circuit output the first control voltage
Bleeder circuit carries out aerial drainage to input voltage, exports the first discharge current；When input voltage is greater than positive threshold voltage, control electricity
Its second output terminal is routed to surge bleeder circuit output the second control voltage, controls surge bleeder circuit to the input voltage
Aerial drainage is carried out, the second discharge current is exported；When input voltage is positive voltage, and is less than positive threshold voltage, first grid is driven
Dynamic circuit provides the first driving voltage to surge bleeder circuit, and second grid driving circuit provides the second driving electricity to transistor M2
Pressure, surge bleeder circuit are to be connected with power output end according to the second driving voltage according to the first driving voltage and transistor M2
Late-class circuit power supply.Based on above-mentioned circuit provided by the embodiment of the utility model, the electronics member of protection power source rear class can be reached
Purpose of the part from surge voltage and reversal connection negative pressure harm.
Further, when input voltage is less than preset negative threshold voltage, the control terminal of transistor M1 receives the first control
Voltage processed, the channel conducting of transistor M1, the input of negative surge voltage will be belonged to by the channel and diode D3 of transistor M1
Voltage is released to ground, the subsequent circuit of protection power source output end and component from the harm of negative surge voltage.When input electricity
When pressure is greater than preset positive threshold voltage, the control terminal of transistor M3 receives the second control voltage, and the channel of transistor M3 is connected,
The input voltage for belonging to positive surge voltage is released to ground by the channel and diode D1 of transistor M3.When input voltage is
Positive voltage and be less than positive threshold voltage when, transistor M1 receive the first driving voltage, transistor M1 channel conducting, transistor
M2 receive the second driving voltage, transistor M2 channel conducting, input voltage via transistor M1 channel and M2 channel to
Power output end power supply, output services electric current.When input voltage is negative voltage, and is greater than negative threshold voltage, that is, circuit
When reversal connection, surge bleeder circuit does not receive control voltage and the second driving voltage, and the channel of transistor M2 does not turn on, to protect
Circuit or component after shield power output end not will receive the harm of reversal connection negative pressure.
Further, electric from the first output end of control circuit to surge aerial drainage when input voltage is less than negative threshold voltage
Road output the first control voltage, surge bleeder circuit control voltage according to first and carry out to the input voltage for belonging to negative surge voltage
Aerial drainage exports the first discharge current.When input voltage is greater than positive threshold voltage, let out from control circuit second output terminal to surge
Current circuit output the second control voltage, surge bleeder circuit control voltage to the input voltage for belonging to positive surge voltage according to second
Aerial drainage is carried out, the second discharge current is exported.
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:
Protection circuit integration power supply interface at mobile phone charging interface is connected by charging circuit with battery of mobile phone
It connects, power supply is phone charger.
Wherein, transistor M1, transistor M2, transistor M3 and transistor M4 are all made of the NMOS that cut-in voltage is 1V
Pipe；
Zener diode Z2 and zener diode Z4 is all made of the zener diode that breakdown reverse voltage is 10V, diode
It is 0.7V that Z1, diode Z3, diode D1, diode D2, diode D3 and diode D4, which are all made of forward conduction voltage, instead
It is greater than the general-purpose diode of 30V to breakdown voltage.
Resistance R1 and resistance R2 is all made of the resistance that resistance value is 100 Ω.
Therefore, negative threshold voltage is -11.7V in circuit, and positive threshold voltage is 11.7V.
Prevent negative surge principle:
When input voltage is less than -11.7V, the source voltage of transistor M4 is -11.7V, and grid voltage is -0.7V, grid
Source voltage is that 10V is greater than cut-in voltage, transistor M4 channel conducting, at this point, by diode Z3, zener diode Z4, resistance R2
Forming circuit is connected with the circuit of transistor M4 to power input, diode Z3 forward conduction, zener diode Z4 is reversed
The anode of breakdown, zener diode Z4 is connected by the channel power input of resistance R2 and transistor M4, at this time resistance R2
The voltage at both ends is greater than the cut-in voltage of transistor M1, the conducting of transistor M1 channel, and negative surge voltage passes through the ditch of transistor M1
Road and diode D3 aerial drainage export discharge current.
Anti-reverse principle:
When input voltage is greater than -11.7V, is less than 0V, if input voltage is greater than -1V, transistor M1 gate source voltage is not
Reach threshold voltage, cannot be connected；If input voltage is less than -1V, transistor M4 conducting, resistance R2 and transistor M4 for crystal
Together, the voltage at transistor M1 grid source both ends is less than cut-in voltage to the grid source shorted on both ends of pipe M2, and transistor M1, which is in, to close
State.At this point, MID will not see negative voltage, therefore protection disclosed by the utility model electricity since diode D1 is reverse-biased
The late-class circuit or device on road will not see negative pressure.
Work normally principle:
When input voltage is greater than 0V, is less than 11.7V, first is provided to transistor M1 via first grid driving circuit and is driven
Dynamic voltage, control transistor M1 channel conducting；The second driving voltage, control are provided to transistor M2 via second grid driving circuit
Transistor M2 channel conducting processed；Power supply connects by the channel of transistor M1 and the channel of transistor M2 to power output end
Circuit and the battery power supply connect, normally charges for battery.
Anti- positive surge principle:
When input voltage is greater than 11.7V, diode Z1 forward conduction, zener diode Z2 is reversed breakdown, power supply
It is grounded and is formed into a loop by diode Z1, diode Z3 and resistance R1, the voltage at the both ends resistance R1 is greater than transistor M3's at this time
Cut-in voltage, the conducting of transistor M3 channel, power input are grounded by the channel of diode D1 and transistor M3, release just
Surge voltage exports discharge current.
It can guarantee that late-class circuit will not see negative voltage via the above process.To protect late-class circuit not will receive wave
It gushes voltage and is reversely connected the harm of negative pressure.
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 (1)
1. a kind of protection circuit characterized by comprising first grid driving circuit, second grid driving circuit, transistor
M2, diode D2, 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 transistor M2 is connected with power output end, and control terminal is connected with the second grid driving circuit, the
Two ends are connected with the surge bleeder 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 second grid driving circuit is connected with the power output end, the control of second end and the transistor M2
End processed is connected；
The surge bleeder circuit includes:
Transistor M1, transistor M3, diode D1 and diode D3；
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 first output end of the control circuit and the first grid
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 M3 is grounded, and control terminal is connected with the second output terminal of the 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；
The control circuit includes:
Resistance R1, resistance R2, transistor M4, diode D4, diode Z1, two pole diode Z3, zener diode Z2 and pressure stabilizing
Pipe Z4；
The cathode of the diode Z1 is connected with the cathode of the zener diode Z2, and anode is connected with the power input；
The anode of the zener diode Z2 is grounded as the control circuit second output terminal by the resistance R1；
The first end of the transistor M4 is connected with the power input, and second end passes through the resistance R2 and control electricity
First output end on road is connected, and control terminal is connected with the cathode of the diode D3；
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；
The cathode of the diode Z3 is connected with the cathode of the zener diode Z4, the plus earth of the diode Z3；
The anode of the zener diode Z4 is connected with the first output end of the control circuit.
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| CN201822274839.0U CN209104803U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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| CN201822274839.0U CN209104803U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449911A (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
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449911A (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 |
| CN109449911B (en) * | 2018-12-26 | 2023-11-28 | 上海艾为电子技术股份有限公司 | Protection circuit |
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