CN209104801U - A kind of protection circuit - Google Patents
A kind of protection circuit Download PDFInfo
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- CN209104801U CN209104801U CN201822203233.8U CN201822203233U CN209104801U CN 209104801 U CN209104801 U CN 209104801U CN 201822203233 U CN201822203233 U CN 201822203233U CN 209104801 U CN209104801 U CN 209104801U
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Abstract
A kind of protection circuit provided by the embodiment of the utility model, comprising: control circuit and surge bleeder circuit；Control circuit is used to provide control voltage to surge bleeder circuit.Control circuit receives input voltage, when the absolute value of input voltage is more than the absolute value of threshold voltage, control circuit provides control voltage to surge bleeder circuit, surge bleeder circuit receives input voltage and control voltage, based on the control voltage that control circuit provides, aerial drainage is carried out to input voltage, exports discharge current, based on above-mentioned circuit, make the electronic component of power supply rear class from surge voltage and reversal connection negative pressure harm.
Description
Technical field
The utility model relates to field of circuit technology 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.But in the prior art, protection circuit can only prevent from being reversely connected or can only realizing
Surge protection has no idea to realize anti-reverse and surge protection at the same time, realizes this respectively according to two different circuits
Two functions, 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.
Therefore, how to realize that anti-reverse and surge protection becomes a kind of very important ask simultaneously in a circuit
Topic.
Utility model content
In view of this, the utility model embodiment provides a kind of protection circuit, solving can not be same in the same circuit
The problem of Shi Shixian is anti-reverse 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: control circuit and surge bleeder circuit；
The control circuit includes:
Diode D3, diode D4, diode Z1, zener diode Z2, resistance R1, resistance R2, resistance R3, resistance R4 and
Transistor M3；
The cathode of the zener diode Z3 is connected with the anode of the anode of power supply and charge power supply respectively, and anode is logical
The resistance R2 is crossed to be connected with the negative terminal of charge power supply；
The anode of the diode D4 is connected by the resistance R4 with the cathode of the zener diode Z3, cathode and institute
The first end for stating transistor M3 is connected；
The anode of the diode Z1 is connected with the negative terminal of the power supply, the yin of cathode and the zener diode Z2
Extremely it is connected；
The anode of the zener diode Z2 is connected with the first end of the transistor M3；
The control terminal of the transistor M3 is connected by the resistance R3 with the cathode of the zener diode Z3, second end
It is connected by the resistance R1 with the negative terminal of the charge power supply；
The anode of the diode D3 is connected with the second end of the transistor M3, and the first of cathode and the transistor M3
End is connected.
The surge bleeder circuit includes:
Transistor M1, diode D1, transistor M2 and diode D2；
The first end of the transistor M1 is connected with the negative terminal of the charge power supply, and second end is negative with the power supply
End is connected, and control terminal is connected with the first end of the transistor M3；
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 negative terminal of the charge power supply, and second end and the power supply are just
End is connected, and control terminal is connected with the common end of the resistance R2 and the zener diode Z3；
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.
Based on a kind of above-mentioned protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when defeated
Enter voltage absolute value be more than threshold voltage absolute value when, control circuit to surge bleeder circuit provide control voltage, surge
Bleeder circuit receives input voltage and control voltage, based on the control voltage that control circuit provides, carries out aerial drainage to input voltage,
Discharge current is exported, based on above-mentioned circuit, makes the electronic component of power supply rear class from the harm of surge voltage and 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 existing circuit diagram for protecting circuit；
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 structural schematic diagram for protecting circuit provided by the embodiment of the utility model；
Fig. 4 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, as shown in Figure 1, including voltage regulator circuit 101, resistance R1
And switching tube M1.The input terminal of voltage regulator circuit receives input voltage VIN, and the output end of voltage regulator circuit 101 is connect by resistance R1
Ground.The second end of switching tube M1 receives input voltage VIN, the first end ground connection of switching tube M1, the control terminal connection of switching tube M1
The output end of voltage regulator circuit 101.Wherein, voltage regulator circuit 101 includes multiple zener diode Z1, multiple zener diode Z1 reversal connections
In circuit.Switching tube M1 can be NMOS tube, and the first end of switching tube M1 is source electrode, and control terminal is grid, and second end is leakage
Pole.
When input voltage VIN is more than clamp voltage, that is, when there is surge voltage, voltage regulator circuit 101 is connected, output conducting
Voltage V1.The control terminal of switching tube M1 has received conducting voltage V1, when conducting voltage V1 is more than the cut-in voltage of switching tube M1,
Switching tube M1 conducting carries out aerial drainage to input voltage VIN.
Surge protection circuit disclosed in Fig. 1 protects the circuit from this mesh of the harm of surge voltage although can be realized
, but circuit and dangerous itself, when input voltage is negative dc voltage, the parasitic diode of switching tube M1 can be connected and
All the time by high current, power is very big, easily damage switching tube M1, therefore existing surge protection circuit and dangerous itself,
And it can not be anti-reverse.
In view of the above-mentioned problems, the utility model embodiment provides a kind of protection circuit, the protection circuit is set to confession
Between power supply and need circuit to be protected；The effect of circuit is protected, as shown in Fig. 2, capableing of the electronics member of protection power source rear class
Part provides the electricity of a normal working range from the harm of surge voltage and reversal connection negative pressure for the electronic component of power supply rear class
Pressure.Such as protection circuit is set between charger and charging interface, charger is power supply, and charging interface and battery are to fill
Power supply charges to charging interface by protection circuit disclosed in the utility model embodiment, guarantees charging by protection circuit
The operating voltage of mouth is normal operating voltage, to play the purpose of protection 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 figure 3, for a kind of structural schematic diagram for protecting circuit provided by the embodiment of the utility model, comprising:
Control circuit 301 and surge bleeder circuit 302.
The control circuit 301, for receiving input voltage, when the absolute value of the input voltage is greater than preset threshold value
When the absolute value of voltage, the output control voltage of Xiang Suoshu surge bleeder circuit 302.
Wherein, the threshold voltage includes first threshold voltage, second threshold voltage and third threshold voltage；Described first
The voltage value of threshold voltage is negative value, for judging whether input voltage is negative surge voltage；The electricity of the second threshold voltage
Pressure value is positive value, for judging whether input voltage is greater than the minimum value of normal working voltage；The voltage value of third threshold voltage
For positive value, third threshold voltage is greater than second threshold voltage, for judging whether input voltage is positive surge voltage.
In addition, control voltage is used to control the component for playing on-off action in surge bleeder circuit 302.Control voltage
Voltage is controlled including the first control voltage, the second control voltage and third.
When input voltage is less than first threshold voltage, output the first control voltage；When input voltage is greater than second threshold
When voltage, output the second control voltage；When input voltage is greater than third threshold voltage, the second control voltage of output and third control
Voltage processed.
It should be noted that input voltage refers to that the potential of power supply anode subtracts obtained by the potential of power supply negative terminal
The potential difference arrived, when the voltage of power supply anode is greater than the voltage of power supply negative terminal, the input voltage is positive voltage, when
When the voltage of power supply anode is less than the voltage of power supply negative terminal, the input voltage is negative voltage.The threshold voltage
It, can be by selecting the component of appropriate size to determine corresponding threshold voltage for determining whether input voltage is surge voltage.
The surge bleeder circuit 302, for carrying out aerial drainage to the input voltage, and defeated according to the control voltage
Discharge current out.
Wherein, when surge bleeder circuit 302 receives the first control voltage, input voltage is negative surge voltage, to negative
Surge voltage carries out aerial drainage.
When surge bleeder circuit 302 only receives the second control voltage, input voltage is normal working voltage, protection electricity
Road is normally late-class circuit power supply.
When surge bleeder circuit 302 receives third control voltage, input voltage is positive surge voltage, to positive surge electricity
Pressure carries out aerial drainage.
A kind of protection circuit provided by the embodiment of the utility model, control circuit 301 receive input voltage, work as input voltage
Absolute value be more than threshold voltage absolute value when, control circuit 301 to surge bleeder circuit 302 provide control voltage, surge
Bleeder circuit 302 receive input voltage and control voltage, based on control circuit 301 provide control voltage, to input voltage into
Row aerial drainage exports discharge current, is based on above-mentioned circuit provided by the embodiment of the utility model, can reach protection power source rear class
Purpose of the electronic component from surge voltage and reversal connection negative pressure harm.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 4, being provided by the embodiment of the utility model
A kind of embodiment of control circuit 401, the control circuit 401 include: in a kind of protection circuit
Diode D3, diode D4, diode Z1, zener diode Z2, zener diode Z3, resistance R1, resistance R2, electricity
Hinder R3, resistance R4 and transistor M3；
The cathode of the zener diode Z3 is connected with the anode of the anode of power supply and charge power supply respectively, and anode is logical
The resistance R2 is crossed to be connected with the negative terminal of charge power supply；
It should be noted that the quantity of the zener diode Z3 can be one, or it is multiple, it can be by setting
Set the zener diode Z3 setting third threshold voltage.The anode of the zener diode Z3 is the second of control circuit 401
Output end, for exporting third control voltage.
The anode of the diode D4 is connected by the resistance R4 with the cathode of the zener diode Z3, cathode and institute
The first end for stating transistor M3 is connected；
It should be noted that the first end of the transistor M3 is the first output end of control circuit 401, for exporting the
One control voltage or the second control voltage.
The anode of the diode Z1 is connected with the negative terminal of the power supply, the yin of cathode and the zener diode Z2
Extremely it is connected；
It should be noted that diode Z1 can be common diode, or zener diode, it is preferred that this
It is general-purpose diode in embodiment.
The anode of the zener diode Z2 is connected with the first end of the transistor M3；
It should be noted that the quantity of zener diode Z2 can be one, or it is multiple, it can be steady by being arranged
Press diode Z2 that first threshold voltage is set.
The control terminal of the transistor M3 is connected by the resistance R3 with the cathode of the zener diode Z3, second end
It is connected by the resistance R1 with the negative terminal of the charge power supply；
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 can be PMOS tube.
The anode of the diode D3 is connected with the second end of the transistor M3, and the first of cathode and the transistor M3
End is connected.
It should be noted that the diode D3 can be the parasitic body diode of transistor M3, or common
Diode.
A kind of protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when input voltage
When absolute value is more than the absolute value of threshold voltage, control circuit provides control voltage, surge bleeder circuit to surge bleeder circuit
Input voltage and control voltage are received, based on the control voltage that control circuit provides, aerial drainage is carried out to input voltage, exports aerial drainage
Electric current 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 wave
It gushes voltage and is reversely connected the purpose of negative pressure harm.
Further, control circuit is when input voltage is less than first threshold voltage, via the first output end of control circuit,
To surge bleeder circuit output the first control voltage；Control circuit is greater than first threshold voltage in input voltage and is less than second threshold
When voltage, control voltage is not exported；Control circuit determines that input voltage is greater than second threshold voltage and is less than third threshold voltage, warp
Voltage is controlled from the first output end of control circuit to surge bleeder circuit output second；Control circuit is greater than the in input voltage
When three input voltages, via the first output end of control circuit to surge bleeder circuit output the second control voltage, and via control
The second output terminal of circuit processed controls voltage to surge bleeder circuit output third.
A kind of protection circuit provided by the embodiment of the utility model, as shown in figure 4, being provided by the embodiment of the utility model
A kind of embodiment of surge bleeder circuit 402 in a kind of protection circuit, the surge bleeder circuit 402 include: transistor M1,
Diode D1, transistor M2 and diode D2；
The first end of the transistor M1 is connected with the negative terminal of the charge power supply, and second end is negative with the power supply
End is connected, and control terminal is connected with the first end of the transistor M3；
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 can be NMOS tube.Further, the first control voltage and the second control
Voltage processed is the voltage greater than transistor M1 cut-in voltage.
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 first end of the transistor M2 is connected with the negative terminal of the charge power supply, and second end and the power supply are just
End is connected, and control terminal is connected with the common end of the resistance R2 and the zener diode Z3；
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 can be NMOS tube.Further, third control voltage is greater than crystalline substance
The voltage of body pipe M1 cut-in 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 transistor M2, or common
Diode.
A kind of protection circuit provided by the embodiment of the utility model, control circuit receives input voltage, when input voltage
When absolute value is more than the absolute value of threshold voltage, control circuit provides control voltage, surge bleeder circuit to surge bleeder circuit
Input voltage and control voltage are received, based on the control voltage that control circuit provides, aerial drainage is carried out to input voltage, exports aerial drainage
Electric current 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 wave
It gushes voltage and is reversely connected the purpose of negative pressure harm.
Further, control circuit is when input voltage is less than first threshold voltage, via the first output end of control circuit,
To surge bleeder circuit output the first control voltage；Control circuit is greater than first threshold voltage in input voltage and is less than second threshold
When voltage, control voltage is not exported；Control circuit determines that input voltage is greater than second threshold voltage and is less than third threshold voltage, warp
Voltage is controlled from the first output end of control circuit to surge bleeder circuit output second；Control circuit is greater than the in input voltage
When three input voltages, via the first output end of control circuit to surge bleeder circuit output the second control voltage, and via control
The second output terminal of circuit processed controls voltage to surge bleeder circuit output third.
Further, when input voltage is less than first threshold voltage, that is, when there is negative surge voltage, surge aerial drainage
Circuit receives the voltage of the first control, opens transistor M1.Power supply cathode passes through the channel and diode D2 of transistor M1
It is connected with power supply anode, aerial drainage is carried out to negative surge voltage, exports pressure release electric current.When input voltage is greater than first threshold electricity
Pressure, when being less than second threshold voltage, that is, circuit is when being reversely connected, and surge bleeder circuit is not received by control voltage, crystal
Pipe M1 and transistor M2 is in channel and does not turn on, and state, power supply cathode is equivalent to off state at this time.Work as input voltage
Greater than second threshold voltage, when being less than third threshold voltage, that is, when being in normal working voltage, surge bleeder circuit is received
To the second control voltage, transistor M1 is opened, circuit can normally charge for charge power supply at this time.When input voltage is greater than third
When threshold voltage, that is, when there is positive surge voltage, surge bleeder circuit receives the second control voltage and simultaneously
Three control voltages, open transistor M1 based on the second control voltage, open transistor M2 based on third control voltage, at this point, for
Electric power positive end is shorted by the channel of M2 and the channel of transistor M1 and power supply, carries out aerial drainage to positive surge voltage, defeated
Pressure release electric current out.The voltage between charge power supply anode and negative terminal is set to be in normal range (NR) via above-mentioned each process, to reach
To the purpose of protection charge power supply.
A kind of protection circuit in conjunction with disclosed in above-described embodiment, in conjunction with Fig. 4, a kind of guarantor disclosed in the utility model embodiment
The specific application example of protection circuit is as follows:
At mobile phone charging interface, charge power supply interface is connected by charging circuit with battery of mobile phone the protection circuit integration
It connects, power supply interface connects phone charger, provides input voltage by phone charger.
Wherein, transistor M1 and transistor M2 is all made of the NMOS tube that cut-in voltage is 1V, and transistor M3 is electric using opening
Pressure is the PMOS tube of 1V.
Zener diode Z2 and zener diode Z3 is all made of the zener diode that breakdown reverse voltage is 10V, diode
It is 0.7V, reverse breakdown electricity that Z1, diode D1, diode D2, diode D3 and diode D4, which are all made of forward conduction voltage,
Pressure is greater than the general-purpose diode of 30V.
Resistance R1, resistance R2, resistance R3 and R4 are all made of the resistance that resistance value is 100 Ω.
First threshold voltage is -12.4V in circuit at this time, and second threshold voltage 1.7V, third threshold voltage is 11V.
Prevent negative surge principle:
When input voltage is less than -12.4V, diode Z1 forward conduction, zener diode Z2 is reversed breakdown, transistor
Voltage between the source electrode and grid of M3 is greater than 1V, and the anode of the conducting of transistor M3 channel, zener diode Z2 passes through transistor
Channel, resistance R1 and the diode D2 of M3 is connect with power supply anode, and the voltage at the both ends resistance R1 is greater than transistor at this time
The cut-in voltage of M1, the conducting of transistor M1 channel, channel and diode D2 aerial drainage, output of the negative surge voltage through transistor M1 are let out
Galvanic electricity stream.
Anti-reverse principle:
When input voltage is greater than -12.4V, is less than 1.7V, if input voltage is greater than -10.7V, zener diode Z2 is not
It is reversed breakdown, the both ends resistance R1 do not have voltage；If input voltage is less than -10.7V, the voltage at the both ends resistance R1 is less than crystal
The cut-in voltage of pipe M1；Transistor M1 is closed, diode D1 reversal connection, and due to the presence of diode D2, so battery negative terminal
Minimum-the 0.7V of voltage.
Work normally principle:
When input voltage is greater than 1.7V, is less than 11V, the second threshold is provided to transistor M1 via resistance R4 and diode D4
Threshold voltage, transistor M1 channel are opened, and transistor M2 channel does not turn on, and can normally be charged for battery.
Anti- positive surge principle:
When input voltage is greater than 11V, transistor M1 channel is connected at this time, and zener diode Z3 is reversed breakdown, supplies
Power supply is connected to by zener diode Z3 and resistance R2 with power supply negative terminal, and the voltage at the both ends resistance R2 is greater than crystal at this time
The cut-in voltage of pipe M2, the conducting of transistor M2 channel, charger anode is by the channel of transistor M2 and the ditch of transistor M1
Road and power supply negative terminal are shorted, and positive surge voltage of releasing exports pressure release electric current.
It can guarantee voltage that late-class circuit is seen between -0.7V to 11V via the above process.To protect rear class electric
Road not will receive surge voltage and the harm for being reversely connected 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 control circuit and surge bleeder circuit；
The control circuit includes:
Diode D3, diode D4, diode Z1, zener diode Z2, zener diode Z3, resistance R1, resistance R2, resistance
R3, resistance R4 and transistor M3；
The cathode of the zener diode Z3 is connected with the anode of the anode of power supply and charge power supply respectively, and anode passes through institute
Resistance R2 is stated to be connected with the negative terminal of charge power supply；
The anode of the diode D4 is connected by the resistance R4 with the cathode of the zener diode Z3, cathode and the crystalline substance
The first end of body pipe M3 is connected；
The anode of the diode Z1 is connected with the negative terminal of the power supply, the cathode phase of cathode and the zener diode Z2
Even；
The anode of the zener diode Z2 is connected with the first end of the transistor M3；
The control terminal of the transistor M3 is connected by the resistance R3 with the cathode of the zener diode Z3, and second end passes through
The resistance R1 is connected with the negative terminal of the charge power supply；
The anode of the diode D3 is connected with the second end of the transistor M3, the first end phase of cathode and the transistor M3
Even；
The surge bleeder circuit includes:
Transistor M1, diode D1, transistor M2 and diode D2；
The first end of the transistor M1 is connected with the negative terminal of the charge power supply, the negative terminal phase of second end and the power supply
Even, control terminal is connected with the first end of the transistor M3；
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 negative terminal of the charge power supply, the anode phase of second end and the power supply
Even, control terminal is connected with the common end of the resistance R2 and the zener diode Z3；
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822203233.8U CN209104801U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822203233.8U CN209104801U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209104801U true CN209104801U (en) | 2019-07-12 |
Family
ID=67163567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822203233.8U Active CN209104801U (en) | 2018-12-26 | 2018-12-26 | A kind of protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361203A (en) * | 2018-12-26 | 2019-02-19 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN110571776A (en) * | 2019-07-10 | 2019-12-13 | 上海艾为电子技术股份有限公司 | surge protection circuit |
-
2018
- 2018-12-26 CN CN201822203233.8U patent/CN209104801U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361203A (en) * | 2018-12-26 | 2019-02-19 | 上海艾为电子技术股份有限公司 | A kind of protection circuit |
| CN109361203B (en) * | 2018-12-26 | 2023-11-21 | 上海艾为电子技术股份有限公司 | Protection circuit |
| CN110571776A (en) * | 2019-07-10 | 2019-12-13 | 上海艾为电子技术股份有限公司 | surge protection circuit |
| CN110571776B (en) * | 2019-07-10 | 2021-09-14 | 上海艾为电子技术股份有限公司 | Surge protection circuit |
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