CN107979064A - A kind of interface protective circuit - Google Patents
A kind of interface protective circuit Download PDFInfo
- Publication number
- CN107979064A CN107979064A CN201810036516.XA CN201810036516A CN107979064A CN 107979064 A CN107979064 A CN 107979064A CN 201810036516 A CN201810036516 A CN 201810036516A CN 107979064 A CN107979064 A CN 107979064A
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- China
- Prior art keywords
- current
- zener diode
- limiting resistance
- voltage
- fuse
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
- H02H5/048—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch additionally responsive to excess current due to heating of the switch
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of interface protective circuit, including：Fuse F1 connects with power input VIN；The zener diode TVS is connected with fuse F1；One end of the current-limiting resistance R1 is connected with fuse F1, and the other end is connected with current-limiting resistance R2；One end of current-limiting resistance R2 is connected with the base stage of triode Q1；One end of current-limiting resistance R3 is connected with the emitter of triode Q1, other end ground connection；One end of zener diode DZ1 is connected with current-limiting resistance R1；The base stage of triode Q1 is connected with current-limiting resistance R2, and collector is connected with the source electrode of PMOS tube M1, and emitter is connected with the grid of PMOS tube M1；The drain electrode of the PMOS tube M1 is connected with the power output end VOUT.The present invention does regulator circuit to determine protection electrical voltage point by resistance and zener diode; the characteristic for adding cut-out and the recovery of fuse carrys out quick response, and accomplishes to recover, while the effect also by the use of PMOS tube as conducting switch; reach reliably protecting subsequent conditioning circuit, ensure the purpose of circuit performance.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of interface protective circuit.
Background technology
The stability of electronic circuit has a great impact for the working performance of device, and input power is subject to extraneous small dry
Device working status or service life in circuit can all be affected by disturbing, and the pulse amplitude sometimes changed is very high and easily burns out device,
So the interface protective circuit can also prevent to burn out device since signal interference produces larger caloric value, when input is more than some
During the pressure voltage of device, it is possible to cause device failure.
Interface protective circuit, exactly in order to protect circuit-line to play the role of protective separation due to extraneous interference.Connect
Mouth protection circuit is composed typically by the reverse-conducting characteristic of backward dioded and the switching characteristic of triode, but such as
Its power characteristic of the triode of fruit selection does not meet the characteristic requirements of circuit, and protection circuit does not have corresponding protection not only and makees
With, while can also influence the normal work of circuit.Zener diode does clamper, it is necessary to series limiting resistor.If current-limiting resistance
It is too small, it is possible to which that beyond the power of zener diode, resistance is too big, the electric current of subsequent conditioning circuit is supplied, and be possible to deficiency.
Therefore, the technical problem that those skilled in the art need urgently to solve is exactly：How to innovate
It is proposed a kind of measure, there is provided a kind of interface protective circuit, prevents input voltage excessive the problem of causing to burn out subsequent conditioning circuit.
The content of the invention
To solve the above problems, the invention discloses a kind of interface protective circuit, with solve it is existing in the prior art because
For input terminal voltage it is excessive caused by burn out subsequent conditioning circuit the problem of.
The interface protective circuit includes：
Power input VIN, fuse F1, zener diode TVS, zener diode DZ1, current-limiting resistance R1, current-limiting resistance R2,
Current-limiting resistance R3, triode Q1, PMOS tube M1, power output end VOUT；
The power input VIN is used to provide power supply to circuit；
The fuse F1 connects with power input VIN, when the power input VIN input current values exceed the fusing
During the setting electric current of device F1, electric current is excessive to cause caloric value excessive, and fuse disconnects, and the fuse F1 is disconnected；
One end of the zener diode TVS is connected with fuse F1, and other end ground connection, the zener diode TVS is used to produce
Raw regulated output voltage, when input voltage is more than the turn-on voltage of the zener diode TVS, the zener diode
TVS is turned on, and exports the voltage stabilizing value of setting, described when input voltage is less than the turn-on voltage of the zener diode TVS
Zener diode TVS ends, output voltage 0；
One end of the current-limiting resistance R1 is connected with fuse F1, and the other end is connected with current-limiting resistance R2；
One end of the current-limiting resistance R2 is connected with current-limiting resistance R1, and the other end is connected with the base stage of triode Q1；
One end of the current-limiting resistance R3 is connected with the emitter of triode Q1, other end ground connection；
One end of the zener diode DZ1 is connected with current-limiting resistance R1, other end ground connection, when input voltage is more than the voltage stabilizing
During the turn-on voltage of diode DZ1, the zener diode DZ1 conductings, and the voltage stabilizing value of setting is exported, when input voltage is small
When the turn-on voltage of the zener diode DZ1, the zener diode DZ1 cut-offs, output voltage 0;
The base stage of the triode Q1 is connected with the current-limiting resistance R2, and collector is connected with the source electrode of PMOS tube M1, emitter
It is connected with the grid of PMOS tube M1；
The drain electrode of the PMOS tube M1 is connected with the power output end VOUT.
In another embodiment based on above-mentioned interface protective circuit, the zener diode TVS, zener diode DZ1
Voltage stabilizing value be 5.1V.
In another embodiment based on above-mentioned interface protective circuit, the working range of the power input VIN is 3V
To 4.2V.
In another embodiment based on above-mentioned interface protective circuit, the current-limiting resistance R1, current-limiting resistance R2, current limliting electricity
The resistance value for hindering R3 is respectively 100K ohm, 2K ohm, 200K ohm.
Compared with prior art, the present invention includes advantages below：
The interface protective circuit of the present invention does regulator circuit to determine protection electrical voltage point by using resistance and zener diode, adds
The characteristic for having entered cut-out and the recovery of fuse carrys out quick response, and accomplishes to recover, while is also used as conducting with PMOS tube
The effect of switch, reach can reliable and stable protection subsequent conditioning circuit and circuit performance when not reducing normal work purpose.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the attached drawing used in technology description to do one simply to introduce, it should be apparent that, drawings in the following description are of the invention
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the electrical block diagram of one embodiment of the interface protective circuit of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment only
It is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
A kind of interface protective circuit provided by the invention and detection method are carried out with reference to the accompanying drawings and examples more detailed
Carefully illustrate.
Fig. 1 is the electrical block diagram of one embodiment of the interface protective circuit of the present invention, as shown in Figure 1, this connects
Mouth protection circuit includes：
Power input VIN, fuse F1, zener diode TVS, zener diode DZ1, current-limiting resistance R1, current-limiting resistance R2,
Current-limiting resistance R3, triode Q1, PMOS tube M1, power output end VOUT；
The power input VIN is used to provide power supply to circuit；
The fuse F1 connects with power input VIN, when the power input VIN input current values exceed the fusing
During the setting electric current of device F1, electric current is excessive to cause caloric value excessive, and fuse disconnects, and the fuse F1 is disconnected；
One end of the zener diode TVS is connected with fuse F1, and other end ground connection, the zener diode TVS is used to produce
Raw regulated output voltage, when input voltage is more than the turn-on voltage of the zener diode TVS, the zener diode
TVS is turned on, and exports the voltage stabilizing value of setting, described when input voltage is less than the turn-on voltage of the zener diode TVS
Zener diode TVS ends, output voltage 0；
One end of the current-limiting resistance R1 is connected with fuse F1, and the other end is connected with current-limiting resistance R2；
One end of the current-limiting resistance R2 is connected with current-limiting resistance R1, and the other end is connected with the base stage of triode Q1；
One end of the current-limiting resistance R3 is connected with the emitter of triode Q1, other end ground connection；
One end of the zener diode DZ1 is connected with current-limiting resistance R1, other end ground connection, when input voltage is more than the voltage stabilizing
During the turn-on voltage of diode DZ1, the zener diode DZ1 conductings, and the voltage stabilizing value of setting is exported, when input voltage is small
When the turn-on voltage of the zener diode DZ1, the zener diode DZ1 cut-offs, output voltage 0;
The base stage of the triode Q1 is connected with the current-limiting resistance R2, and collector is connected with the source electrode of PMOS tube M1, emitter
It is connected with the grid of PMOS tube M1；
The drain electrode of the PMOS tube M1 is connected with the power output end VOUT.
The zener diode TVS, the voltage stabilizing value of zener diode DZ1 are 5.1V.
The working range of the power input VIN is 3V to 4.2V.
The current-limiting resistance R1, current-limiting resistance R2, the resistance value of current-limiting resistance R3 are respectively 100K ohm, 2K ohm,
200K ohm.
Since the input voltage of power input VIN is between 3V to 4.2V, and zener diode TVS, zener diode
The voltage stabilizing value of DZ1 is 5.1V, and the zener diode DZ1 is not turned on, triode Q1 cut-offs, while the grid of PMOS tube and drain electrode
Between have a voltage difference, so PMOS tube will turn on, the output voltage of power output end VOUT is equal to power input VIN's
Voltage subtracts the conduction voltage drop of PMOS.At this time because zener diode TVS, zener diode DZ1 are not turned on, will not increase extra
Power consumption, do not reduce the load capacity of power supply yet；
When conducting voltage of the power input VIN inputs more than zener diode TVS, zener diode DZ1, and it is less than fuse
During the breakdown voltage of F1, zener diode TVS, zener diode DZ1 conducting, by the base stage voltage stabilizing of triode Q1 in 5.1V, three
Pole pipe Q1 will be turned on, and the conducting of triode Q1 is by the drain electrode of PMOS tube and source short, PMOS tube shut-off, so power output end
VOUT output voltages are 0, have blocked output；
When power input VIN input due to voltage spikes it is excessive, cause electric current to rise, caloric value is excessive, and fuse F1 will melt
It is disconnected, so as to play buffer action, the electronic loop that device is burnt out caused by power is excessive is cut off, is treated under circuit stability
Come, will recover to connect again after fuse cooling, circuit recovers to work normally again；
Voltage stabilizing value to zener diode DZ1 is suitably adjusted, and protection voltage that can be to this circuit is adjusted；
Selection to the watt level of PMOS, is adapted to the adjusting to load capacity.
1st, under normal conditions, between 3V to 4.2V, zener diode DZ1 is not turned on VIN input voltages, and triode Q1 is cut
Only, while between the grid of PMOS tube and drain electrode there is a larger pressure difference, so PMOS tube will turn on, power output end VOUT
Voltage of the voltage equal to VIN subtract the conduction voltage drop of PMOS, power output end VOUT is no better than power input VIN, this
Shi Yinwei zener diodes are not turned on, and will not increase extra power consumption, also do not reduce the load capacity of power supply；
2nd, when the due to voltage spikes of a 10V（Or continuous voltage）Introduce power input VIN, zener diode DZ1 conductings, by three
The base stage voltage stabilizing of pole pipe Q1 will be turned in 5.1V, triode Q1, the drain electrode of the conducting of the triode Q1 PMOS tube by short circuit and source
Pole, PMOS tube shut-off, so power output end VOUT outputs are 0, has blocked output.
3rd, when the due to voltage spikes bigger of power input VIN inputs, if interface circuit for normal working voltage is 24V
Circuit on, the peak voltage of power input VIN reach 35V even bigger when, and operating current is in hundreds of milliamperes of ranks, this
When fuse will rise a buffer action, cut off the electronic loop that device is burnt out caused by power is excessive, treat under circuit stability
Come, will recover to connect again after fuse cooling, circuit recovers to work normally again；
4th, zener diode TVS is quick response device, therefore this circuit protection speed is very fast, the protection also strengthened it is effective
Property；
5th, the voltage stabilizing value to zener diode DZ1 is suitably adjusted, and protection voltage that can be to this circuit is adjusted, right
The principle and embodiment of PMOS tube are set forth, and the explanation of above example is only intended to help to understand method of the invention
And its core concept；Meanwhile for those of ordinary skill in the art, according to the thought of the present invention, in embodiment and
There will be changes in application range, in conclusion this specification content should not be construed as limiting the invention.
The present invention realizes the step of pressure stabilization function：
1st, a power supply signal for being more than zener diode DZ1 is accessed, zener diode DZ1 reverse breakdowns, then carry for triode
For a stable base voltage；
2nd, triode Q1 base stages and emitter voltage drop are more than the VGS of triode ON, triode ON, the gate pole of PMOS tube and leakage
Extreme pressure is reduced to the conduction voltage drop of triode, and PMOS tube will end, and cut off the output of power output end VOUT.
3rd, when input peak voltage it is very big, quickly when, zener diode TVS fast conductings, clamper lives input voltage, fusing
Device F1 fuses, and treats that spike disappears after a certain period of time, and fuse F1 temperature is fallen after rise to be turned on again, continues to turn on power circuit.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To modify to the technical solution described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic,
Within the spirit and principles of the invention, any modification, equivalent replacement, improvement and so on, should be included in the present invention's
Within protection domain.
Claims (4)
- A kind of 1. interface protective circuit, it is characterised in that including：Power input VIN, fuse F1, zener diode TVS, zener diode DZ1, current-limiting resistance R1, current-limiting resistance R2, Current-limiting resistance R3, triode Q1, PMOS tube M1, power output end VOUT；The power input VIN is used to provide power supply to circuit；The fuse F1 connects with power input VIN, when the power input VIN input current values exceed the fusing During the setting electric current of device F1, the fuse F1 is disconnected；One end of the zener diode TVS is connected with fuse F1, and other end ground connection, the zener diode TVS is used to produce Raw regulated output voltage, when input voltage is more than the turn-on voltage of the zener diode TVS, the zener diode TVS is turned on, and exports the voltage stabilizing value of setting, described when input voltage is less than the turn-on voltage of the zener diode TVS Zener diode TVS ends, output voltage 0；One end of the current-limiting resistance R1 is connected with fuse F1, and the other end is connected with current-limiting resistance R2；One end of the current-limiting resistance R2 is connected with current-limiting resistance R1, and the other end is connected with the base stage of triode Q1；One end of the current-limiting resistance R3 is connected with the emitter of triode Q1, other end ground connection；One end of the zener diode DZ1 is connected with current-limiting resistance R1, other end ground connection, when input voltage is more than the voltage stabilizing During the turn-on voltage of diode DZ1, the zener diode DZ1 conductings, and the voltage stabilizing value of setting is exported, when input voltage is small When the turn-on voltage of the zener diode DZ1, the zener diode DZ1 cut-offs, output voltage 0;The base stage of the triode Q1 is connected with the current-limiting resistance R2, and collector is connected with the source electrode of PMOS tube M1, emitter It is connected with the grid of PMOS tube M1；The drain electrode of the PMOS tube M1 is connected with the power output end VOUT.
- 2. interface protective circuit according to claim 1, it is characterised in that the zener diode TVS, zener diode The voltage stabilizing value of DZ1 is 5.1V.
- 3. interface protective circuit according to claim 1, it is characterised in that the working range of the power input VIN For 3V to 4.2V.
- 4. interface protective circuit according to claim 1, it is characterised in that the current-limiting resistance R1, current-limiting resistance R2, limit The resistance value of leakage resistance R3 is respectively 100K ohm, 2K ohm, 200K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036516.XA CN107979064A (en) | 2018-01-15 | 2018-01-15 | A kind of interface protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036516.XA CN107979064A (en) | 2018-01-15 | 2018-01-15 | A kind of interface protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107979064A true CN107979064A (en) | 2018-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810036516.XA Pending CN107979064A (en) | 2018-01-15 | 2018-01-15 | A kind of interface protective circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020119531A1 (en) * | 2018-12-14 | 2020-06-18 | 中兴通讯股份有限公司 | Surge protection circuit and terminal and surge voltage bleeding method for power interface |
| CN111313364A (en) * | 2019-11-29 | 2020-06-19 | 南通同洲电子有限责任公司 | Overvoltage protection device and overvoltage protection method |
| EP3683922B1 (en) * | 2019-01-17 | 2023-06-21 | Japan Tobacco, Inc. | Power supply unit for aerosol inhaler |
| EP4084250A4 (en) * | 2020-01-21 | 2024-01-24 | Huawei Technologies Co., Ltd. | Charging port protection apparatus and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014146268A1 (en) * | 2013-03-20 | 2014-09-25 | Xiang Zhiyong | Overvoltage protection circuit and method |
| CN104426119A (en) * | 2013-08-26 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Power output protection circuit |
| CN107230965A (en) * | 2017-08-07 | 2017-10-03 | 东莞博力威电池有限公司 | Port multi-level protection circuit |
-
2018
- 2018-01-15 CN CN201810036516.XA patent/CN107979064A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014146268A1 (en) * | 2013-03-20 | 2014-09-25 | Xiang Zhiyong | Overvoltage protection circuit and method |
| CN104426119A (en) * | 2013-08-26 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Power output protection circuit |
| CN107230965A (en) * | 2017-08-07 | 2017-10-03 | 东莞博力威电池有限公司 | Port multi-level protection circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020119531A1 (en) * | 2018-12-14 | 2020-06-18 | 中兴通讯股份有限公司 | Surge protection circuit and terminal and surge voltage bleeding method for power interface |
| EP3683922B1 (en) * | 2019-01-17 | 2023-06-21 | Japan Tobacco, Inc. | Power supply unit for aerosol inhaler |
| CN111313364A (en) * | 2019-11-29 | 2020-06-19 | 南通同洲电子有限责任公司 | Overvoltage protection device and overvoltage protection method |
| EP4084250A4 (en) * | 2020-01-21 | 2024-01-24 | Huawei Technologies Co., Ltd. | Charging port protection apparatus and terminal |
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Address after: 523000 Tongsha New Industrial Park, Dongcheng Street, Dongguan City, Guangdong Province Applicant after: Guangdong Boliwei Technology Co., Ltd. Address before: 523000 new industrial zone, Dongcheng District, Guangdong, Dongguan Applicant before: DongGuan Greenway Battery Co., Ltd. |