CN208971122U - Overvoltage crowbar and power bus slave circuit - Google Patents
Overvoltage crowbar and power bus slave circuit Download PDFInfo
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- CN208971122U CN208971122U CN201821658863.8U CN201821658863U CN208971122U CN 208971122 U CN208971122 U CN 208971122U CN 201821658863 U CN201821658863 U CN 201821658863U CN 208971122 U CN208971122 U CN 208971122U
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- nmos tube
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Abstract
The utility model provides a kind of overvoltage crowbar and power bus slave circuit.Overvoltage crowbar includes NMOS tube, first diode and npn type triode；NMOS tube is connected on load circuit, and NMOS tube is connect with power cathode, the negative terminal of load circuit and positive pole respectively；First diode is connect with positive pole and power cathode respectively, and first diode is zener diode；The base stage of npn type triode is connected between the anode of first diode and power cathode, and the collector of npn type triode is connect with positive pole, and the emitter of npn type triode is connect with power cathode；The utility model in circuit over-voltage, open by first diode conducting, npn type triode, drags down NMOS tube grid voltage, so that NMOS tube be made to turn off, realizes load circuit protection, and load circuit protects fast response time, component temperature rise is small in circuit.
Description
Technical field
The utility model relates to a kind of power bus more particularly to a kind of overvoltage crowbars and power bus from electromechanics
Road.
Background technique
In recent years, the fast development of electronic technology, power bus technology also proper extensive use, consequently also brings some ask
Topic.Due to the complexity of site operation environment, occurs power bus misconnection often during installation and debugging and enter other power supply systems
The case where system, makes power bus over-voltage, and a large amount of slaves on power bus is caused to burn out.
Existing slave overvoltage protection mode is that slave input circuit series thermal-sensitive resistance loads transient diode in parallel simultaneously
Protected mode.In power bus over-voltage, thermistor heating overheat current limliting, transient diode clamper pressure limiting is realized to load
Circuit protection, still, the circuit of the protected mode exist the rated operational current provided is small, protection response speed is slow, protection when
The problems such as circuit temperature increases.
Utility model content
The utility model embodiment provides a kind of overvoltage crowbar and power bus slave circuit, at least to solve or
Alleviate one or more technical problems in the prior art, or a kind of beneficial selection is at least provided.
The utility model in a first aspect, providing a kind of overvoltage crowbar, comprising:
NMOS tube, the NMOS tube are connected on load circuit, and the source electrode of the NMOS tube is connect with power cathode, described
The drain electrode of NMOS tube is connect with the negative terminal of the load circuit, and the grid of the NMOS pipe is connect with positive pole；
First diode, the cathode of the first diode are connect with the positive pole, and the first diode is just
Pole is connect with the power cathode, and first diode is zener diode；
Npn type triode, the base stage of the npn type triode are connected to the anode and the power supply of the first diode
Between cathode, the collector of the npn type triode is connect with the positive pole, the emitter of the npn type triode with
The power cathode connection；
When circuit over-voltage, first diode reverse breakdown conducting, the npn type triode is opened.
In an embodiment, further includes:
The cathode of second diode, second diode is connect with the positive pole, and second diode is just
Pole is connect with the power cathode, and the second diode is zener diode.
In an embodiment, further includes:
First current limiting unit, first current limiting unit are connected between the first diode and the positive pole；
Second current limiting unit, second current limiting unit one end are connect with the positive pole, second current limiting unit
The other end connects with the grid of the collector of the npn type triode, the cathode of second diode and the NMOS tube respectively
It connects.
In an embodiment, further includes:
First capacitor, described first capacitor one end are connected to the anode and the npn type triode of the first diode
Base stage connecting line between, the other end of the first capacitor is connect with the power cathode.
In an embodiment, further include
Second capacitor, second capacitor one end are connected to the collection of second current limiting unit Yu the npn type triode
Between electrode, the other end of second capacitor is connect with the power cathode.
In an embodiment, further includes:
The anode of third diode, the third diode is connect with the positive pole, and the third diode is born
Pole is connect with first current limiting unit and second current limiting unit respectively.
In an embodiment, first current limiting unit and second current limiting unit include two concatenated limits
Leakage resistance.
In an embodiment, the NMOS tube is 600V pressure resistance NMOS tube.
In an embodiment, the first diode adjusts overvoltage protection threshold parameter, institute for changing pressure stabilizing value
It states the second diode to be used for: when first diode is reversely ended and npn type triode shutdown, making the grid of the NMOS tube
Pole tension reaches conducting voltage.
The second aspect of the utility model provides a kind of power bus slave circuit, including as in above embodiment
Any overvoltage crowbar.
The overvoltage crowbar of the utility model is when voltage is higher than overvoltage protection thresholding, first diode conducting, npn
Type triode is opened, NMOS tube shutdown, realizes load protection, and fast response time, component temperature in circuit are protected in circuit load
It rises small.
Above-mentioned general introduction is merely to illustrate that the purpose of book, it is not intended to be limited in any way.Except foregoing description
Schematical aspect, except embodiment and feature, by reference to attached drawing and the following detailed description, the utility model is into one
Aspect, embodiment and the feature of step, which will be, to be readily apparent that.
Detailed description of the invention
In the accompanying drawings, unless specified otherwise herein, otherwise indicate the same or similar through the identical appended drawing reference of multiple attached drawings
Component or element.What these attached drawings were not necessarily to scale.It should be understood that these attached drawings are depicted only according to originally practical
Novel disclosed some embodiments, and should not be taken as the limitation to the scope of the utility model.
Fig. 1 is the circuit diagram of overvoltage crowbar in the utility model embodiment.
Fig. 2 is the circuit diagram of another overvoltage crowbar in the utility model embodiment.
Fig. 3 is the circuit diagram of another overvoltage crowbar in the utility model embodiment.
Appended drawing reference:
101 NMOS tubes；
102 power cathodes；
The negative terminal of 103 load circuits；
104 positive poles；
105 first diodes；
106 npn type triodes；
107 second diodes；
108 first current limiting units；
109 second current limiting units；
110 first capacitors；
111 second capacitors；
112 third diodes；
113 current-limiting resistances.
Specific embodiment
Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that
Like that, without departing from the spirit or scope of the present utility model, it can be modified by various different modes described real
Apply example.Therefore, attached drawing and description are considered essentially illustrative rather than restrictive.
The utility model first aspect provides a kind of overvoltage crowbar.
Shown in referring to Fig.1, overvoltage crowbar includes NMOS tube 101, first diode 105 and npn type triode
106。
NMOS tube 101 is connected on load circuit, and the source electrode of NMOS tube 101 is connect with power cathode (GND) 102, NMOS
The drain electrode of pipe 101 and the negative terminal (GND1) 103 of load circuit connect, and the grid and positive pole (VCC) 104 of NMOS pipe 101 connect
It connects.
The cathode of first diode 105 is connect with positive pole 104, anode and the power cathode 102 of first diode 105
Connection, first diode 105 are zener diode；First diode 105 reversely ends shutdown when circuit works normally, in electricity
When passing by pressure, reverse breakdown conducting.
The base stage of npn type triode 106 is connected between the anode of first diode 105 and power cathode 102, npn type
The collector of triode 106 is connect with positive pole 104, and the emitter of npn type triode 106 is connect with power cathode 102；
Npn type triode 106 is turned off when circuit works normally, and is connected in circuit over-voltage.
When circuit over-voltage, the conducting of 105 reverse breakdown of first diode, npn type triode ON, the grid of NMOS pipe 101
Pole tension is pulled low to 0V, turns off NMOS tube 101, to make load be protected, and fast response time, electricity are protected in circuit load
Component temperature rise is small in road.
Further, NMOS tube 101 is 600V pressure resistance NMOS tube 101.The NMOS pipe 101 of high voltage value can be realized wider
Protection voltage.
Shown in referring to Fig.1, in one embodiment, overvoltage crowbar further includes the second diode 107.Second diode
107 cathode is connect with positive pole 104, and the anode of the second diode 107 is connect with power cathode 102, the second diode 107
For zener diode；When circuit works normally, first diode 105 is reversely ended, the shutdown of npn type triode, the two or two pole
Pipe 107 makes the grid voltage of NMOS tube 101 reach conducting voltage, to make NMOS tube 101 that powering load be connected.
Further, first diode 105 adjusts overvoltage protection threshold parameter for changing pressure stabilizing value.In this way, it can be achieved that
Overvoltage protection threshold parameter is adjusted flexibly.
Referring to shown in Fig. 2, in one embodiment, overvoltage crowbar further includes the first current limiting unit 108 and the second limit
Flow unit 109.
First current limiting unit 108 is connected between first diode 105 and positive pole 104.
Second current limiting unit, 109 one end is connect with positive pole 104,109 other end of the second current limiting unit respectively with npn type
The collector of triode 106, the second diode 107 cathode connected with the grid of NMOS tube 101.
First current limiting unit 108 and the second current limiting unit 109 for make first diode 105, npn type triode 106 with
And when the second work of diode 107 within the scope of normal current.
Further, the first current limiting unit 108 and the second current limiting unit 109 include two concatenated current-limiting resistances 113.
The resistance value of current-limiting resistance 113 is 150K Ω.The resistance value and quantity of the resistance value of current-limiting resistance 113 can freely be set, specific to need
It can be determined according to circuit.
Referring to shown in Fig. 3, in one embodiment, overvoltage crowbar further includes first capacitor 110 and the second capacitor
111。
110 one end of first capacitor is connected to the base stage connecting line of the anode and npn type triode 106 of first diode 105
Between, the other end of first capacitor 110 is connect with power cathode 102.
Second capacitor, 111 one end is connected between the second current limiting unit 109 and the collector of npn type triode 106, and second
The other end of capacitor 111 is connect with power cathode 102.
First capacitor 110 and the second capacitor 111 are anti-interference capacitor, prevent interference from triggering and leading to npn type triode 106
With the malfunction of NMOS tube 101.
Referring to shown in Fig. 3, in one embodiment, overvoltage crowbar further includes third diode 112.
The anode of third diode 112 is connect with positive pole 104, and the cathode of third diode 112 is limited with first respectively
Flow unit 108 and the connection of the second current limiting unit 109.
Third diode 112 is used to prevent interference triggering and leads to the malfunction of npn type triode 106 and NMOS tube 101
Make.
The second aspect of the utility model provides a kind of power bus slave circuit, including in such as above-described embodiment
Any overvoltage crowbar.
Overvoltage crowbar is when voltage is higher than overvoltage protection thresholding in the present embodiment power bus slave circuit, and the one or two
Pole pipe 105 is connected, and npn type triode is opened, and NMOS tube 101 turns off, and realizes load protection, and response speed is protected in circuit load
Fastly, component temperature rise is small in circuit, effective protection power bus slave circuit using safe.
More than, only specific embodiment of the present utility model, but protection scope of the utility model is not limited thereto,
Anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in its various change
Or replacement, these should be covered within the scope of the utility model.Therefore, protection scope of the utility model Ying Yiquan
Subject to the protection scope that benefit requires.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on the figure
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model
Limitation.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.The meaning of " plurality " is two or two in the description of the present invention,
More than, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected, can also be communication；It can be directly connected, the indirect phase of intermediary can also be passed through
Even, the connection inside two elements or the interaction relationship of two elements be can be.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it
"lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to
Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above "
One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special
Sign includes fisrt feature right above second feature and oblique upper under the second feature " below ", " below " and " below ", or only
Indicate that first feature horizontal height is less than second feature.
Above disclosure provides many different embodiments or example is used to realize the different structure of the utility model.
In order to simplify the disclosure of the utility model, above the component of specific examples and setting are described.Certainly, they are only
Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals
And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments
And/or the relationship between setting.In addition, the example of various specific techniques and material that the utility model provides, but this
Field those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Claims (6)
1. a kind of overvoltage crowbar characterized by comprising
The anode of third diode, the third diode is connect with positive pole；
First current limiting unit, first current limiting unit one end are connect with the cathode of the third diode；
Second current limiting unit, second current limiting unit one end are connect with the cathode of the third diode；
NMOS tube, the NMOS tube are connected on load circuit, and the source electrode of the NMOS tube is connect with power cathode, the NMOS
The drain electrode of pipe is connect with the negative terminal of the load circuit, and the grid of the NMOS tube and the second current limiting unit other end connect
It connects；
First diode, the cathode of the first diode are connect with the first current limiting unit other end, and first diode is
Zener diode；
Npn type triode, the base stage of the npn type triode are connect with the anode of the first diode, three pole of npn type
The collector of pipe is connect with the second current limiting unit other end, the emitter and the power cathode of the npn type triode
Connection；
Second diode, the cathode of second diode are connect with the second current limiting unit other end, the two or two pole
The anode of pipe is connect with the power cathode, and the second diode is zener diode；
Second capacitor, second capacitor one end are connected to the collector of second current limiting unit Yu the npn type triode
Between, the other end of second capacitor is connect with the power cathode；
When circuit over-voltage, first diode reverse breakdown conducting, the npn type triode is opened.
2. overvoltage crowbar as described in claim 1, which is characterized in that further include:
First capacitor, described first capacitor one end are connected to the base of the anode and the npn type triode of the first diode
Between the connecting line of pole, the other end of the first capacitor is connect with the power cathode.
3. overvoltage crowbar as claimed in claim 1 or 2, which is characterized in that first current limiting unit and described second
Current limiting unit includes two concatenated current-limiting resistances.
4. overvoltage crowbar as claimed in claim 1 or 2, which is characterized in that the NMOS tube is 600V pressure resistance NMOS tube.
5. overvoltage crowbar as claimed in claim 1 or 2, which is characterized in that the first diode is for changing pressure stabilizing
Value adjustment overvoltage protection threshold parameter, second diode are used for: when first diode is reversely ended and three pole of npn type
When pipe turns off, the grid voltage of the NMOS tube is made to reach conducting voltage.
6. a kind of power bus slave circuit, which is characterized in that including the over-voltage as described in claim 1-5 any claim
Protect circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821658863.8U CN208971122U (en) | 2018-10-12 | 2018-10-12 | Overvoltage crowbar and power bus slave circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821658863.8U CN208971122U (en) | 2018-10-12 | 2018-10-12 | Overvoltage crowbar and power bus slave circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208971122U true CN208971122U (en) | 2019-06-11 |
Family
ID=66759839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821658863.8U Active CN208971122U (en) | 2018-10-12 | 2018-10-12 | Overvoltage crowbar and power bus slave circuit |
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| CN (1) | CN208971122U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611300A (en) * | 2019-09-30 | 2019-12-24 | 雅迪科技集团有限公司 | High-voltage short circuit turn-off protection circuit for electric vehicle bus communication |
-
2018
- 2018-10-12 CN CN201821658863.8U patent/CN208971122U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611300A (en) * | 2019-09-30 | 2019-12-24 | 雅迪科技集团有限公司 | High-voltage short circuit turn-off protection circuit for electric vehicle bus communication |
| CN110611300B (en) * | 2019-09-30 | 2021-08-03 | 雅迪科技集团有限公司 | High-voltage short circuit turn-off protection circuit for electric vehicle bus communication |
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