CN209626947U - A kind of overvoltage crowbar of car networking system - Google Patents
A kind of overvoltage crowbar of car networking system Download PDFInfo
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- CN209626947U CN209626947U CN201920458933.3U CN201920458933U CN209626947U CN 209626947 U CN209626947 U CN 209626947U CN 201920458933 U CN201920458933 U CN 201920458933U CN 209626947 U CN209626947 U CN 209626947U
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- 230000006855 networking Effects 0.000 title claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000541 pulsatile effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a kind of overvoltage crowbar of car networking system, which includes: overvoltage protective module, load；Wherein the overvoltage protective module includes over-voltage onunit, switch unit; the input terminal of the over-voltage onunit is connected with voltage input end; the output end of the over-voltage onunit is connected with the input terminal of switch unit, and the output end of the switch unit is connected with load；The over-voltage onunit is configured to the conducting when receiving the voltage greater than or equal to preset threshold, and the switch unit is configured to the short circuit when the over-voltage onunit is connected and turns off, and the load stops working.Based on technical solution provided by the utility model, switch unit can turn off in short circuit when over-voltage onunit is connected, and the safety of the load under overpressure conditions has been effectively ensured.
Description
Technical field
The utility model relates to vehicle electric fields, more particularly to a kind of overvoltage crowbar of car networking system.
Background technique
Electronic apparatus system on vehicle is extremely complex, there is the presence of generator and some inductive loads, leads to vehicle-mounted power supply
In system, voltage is highly unstable, and in the case where vehicle has throw load, power supply system often generates significantly larger than vehicle on vehicle
The voltage for carrying storage battery rated value occurs, so that vehicle electronics electric system faces severe overpressure conditions, onboard system is often
It is damaged because of over-voltage, and needs often maintenance replacement, seriously threaten vehicle electronics the electric system even reliability of vehicle.
Utility model content
In view of the above problems, the utility model is proposed to overcome the above problem in order to provide one kind or at least partly solve
The certainly overvoltage crowbar of the car networking system of the above problem.
According to the one aspect of the utility model, a kind of overvoltage crowbar of car networking system is provided, comprising: over-voltage
Protective module, load；Wherein
The overvoltage protective module includes over-voltage onunit, switch unit, the input terminal of the over-voltage onunit with
Voltage input end is connected, and the output end of the over-voltage onunit is connected with the input terminal of switch unit, the switch unit
Output end is connected with load；
The over-voltage onunit is configured to the conducting when receiving the voltage greater than or equal to preset threshold, the switch
Unit is configured to the short circuit when the over-voltage onunit is connected and turns off, and the load stops working.
Optionally, the over-voltage onunit includes: first resistor R1, second resistance R2, voltage-stabiliser tube D1, first switch tube
Q1；Wherein,
The first switch tube Q1 is PNP type triode, and the first resistor R1 is equal with the resistance value of second resistance R2, institute
The one end for stating first resistor R1 is connected with the emitter of the voltage input end, first switch tube Q1 respectively, first resistor R1's
The other end is connected with the base stage of the second resistance R2, first switch tube Q1 respectively,
One end of the second resistance R2 is connected with the base stage of the first resistor R1, first switch tube Q1 respectively, described
The other end of second resistance R2 is connected with the anode of the voltage-stabiliser tube D1, the cathode ground connection of the voltage-stabiliser tube D1；
The emitter of the first switch tube Q1 is also connected with the switch unit with collector；
When the high voltage conduction unit receives the voltage greater than or equal to preset threshold, the voltage-stabiliser tube D1 conducting,
The first switch tube Q1 conducting.
Optionally, the switch unit includes: 3rd resistor, the 4th resistance, second switch；Wherein,
The second switch is p-type metal-oxide-semiconductor, and the 3rd resistor R3 is equal with the resistance value of the 4th resistance R4, described the
One end of three resistance R3 is connected with the source electrode of the emitter of the first switch tube Q1, the second switch Q2 respectively, described
The other end of 3rd resistor R3 respectively with the collector of the first switch tube Q1, the base stage of second switch Q2, the 4th resistance
One end of R4 is connected, the other end ground connection of the 4th resistance R4；
The drain electrode of the second switch Q2 is connected with the load；
When the voltage of voltage input end input reaches preset threshold, over-voltage onunit conducting, described the
One switching tube Q1 conducting, the 3rd resistor R3 short circuit, the second switch Q2 shutdown, the load stop working；And
When the voltage of voltage input end input is lower than preset threshold, over-voltage onunit shutdown, described the
One switching tube Q1 shutdown, the 3rd resistor R3 are worked normally, and the second switch Q2 conducting, the load is started to work.
Optionally, the circuit further include: anti-reverse module, filter module；Wherein,
The input terminal of the anti-reverse module is connected with voltage input end, the output end of the anti-reverse module and the filter
The connection of wave module, the output end of the filter module are connected with the input terminal of the overvoltage protective module；
The anti-reverse module includes diode D2, and the filter module includes inductance L1, first capacitor C1, the second capacitor
The anode of C2, the diode D2 are connected with voltage input end, one end phase of the cathode of the diode D2 and the inductance L1
Even, the other end of the inductance L1 is connected with first capacitor C1, the second capacitor C2 in parallel.
In the utility model embodiment, the input terminal of over-voltage onunit is connected with voltage input end, output end with open
The input terminal for closing unit is connected, when voltage input end input is greater than or equal to the voltage of preset threshold, over-voltage onunit meeting
Conducting, and switch unit can turn off in short circuit when over-voltage onunit is connected, and prevent load from damaging due to over-voltage, and work as voltage
When returning to normal range (NR), over-voltage onunit can be turned off, and switch unit can be connected, and load is started to work, and be integrally improved vehicle-mounted
The safety and reliability of system.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift specific embodiment of the present utility model.
According to the accompanying drawings to the detailed description of the utility model specific embodiment, those skilled in the art will be more
Add the above-mentioned and other purposes, advantages and features of clear the utility model.
Detailed description of the invention
Some specific realities of the utility model are described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter
Apply example.Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that
The drawings are not necessarily drawn to scale.In attached drawing:
Fig. 1 shows the overvoltage crowbar figure according to the car networking system of the utility model embodiment.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
It should be noted that technical characteristic under the premise of not conflicting in the utility model embodiment and alternative embodiment
It can be combined with each other.
In order to solve the above-mentioned technical problem, the utility model embodiment proposes a kind of overvoltage protection electricity of car networking system
Road, Fig. 1 shows the overvoltage crowbar figure according to the car networking system of the utility model embodiment, as shown in Figure 1, the over-voltage
Protection circuit includes: overvoltage protective module 1, load；Wherein, overvoltage protective module 1 includes over-voltage onunit 1a, switch unit
The input terminal of 1b, over-voltage onunit 1a are connected with voltage input end, the output end and switch unit 1b of over-voltage onunit 1a
Input terminal be connected, the output end of switch unit 1b is connected with loading；Over-voltage onunit 1a be configured to be higher than when receiving or
Equal to preset threshold voltage when be connected, switch unit 1b be configured to when over-voltage onunit 1a be connected when short circuit turn off, load
It stops working.
In the utility model embodiment, the input terminal of over-voltage onunit 1a is connected with voltage input end, over-voltage conducting
The output end of unit 1a is connected with the input terminal of switch unit 1b, when voltage input end input is greater than or equal to the electricity of preset threshold
When pressure, over-voltage onunit 1a can be connected, and switch unit 1b can be turned off in short circuit when over-voltage onunit 1a is connected, and prevent from bearing
Load is damaged due to over-voltage, and when voltage returns to normal range (NR), over-voltage onunit 1a can be turned off, and switch unit 1b can be led
Logical, load is started to work, and is integrally improved the safety and reliability of onboard system.
In a preferred embodiment, above-mentioned over-voltage onunit 1a includes: first resistor R1, second resistance R2, pressure stabilizing
Pipe D1, first switch tube Q1；Wherein, first switch tube Q1 is PNP type triode, the resistance value of first resistor R1 and second resistance R2
Equal, one end of first resistor R1 is connected with the emitter of voltage input end, first switch tube Q respectively, and first resistor R1's is another
One end is connected with the base stage of second resistance R2, first switch tube Q1 respectively, one end of second resistance R2 respectively with first resistor R1,
The base stage of first switch tube Q1 is connected, and the other end of second resistance R2 is connected with the anode of voltage-stabiliser tube D1, the cathode of voltage-stabiliser tube D1
Ground connection；The emitter of first switch tube Q1 is also connected with switch unit with collector；It is higher than when high voltage conduction unit 1a is received
Or equal to preset threshold voltage when, voltage-stabiliser tube D1 conducting, first switch tube Q1 conducting.
In the preferred embodiment in the utility model, the pressure stabilizing value range of voltage-stabiliser tube D1 is+24V, when voltage input end inputs
Voltage BATT_+12V when being greater than 24V, first resistor R1, second resistance R2 and zener diode D1 initially form access, first
Pressure difference is initially formed on resistance R1 resistance and second resistance R2 resistance, due to the resistance value phase of first resistor R1 and second resistance R2
Deng being in the present embodiment 10K, therefore, the pressure difference on first resistor R1 and second resistance R2 is equal, the electricity of first resistor R1
Pressing VR1=(VBatt_+12V-VD1)/2, VD1 is the voltage on voltage-stabiliser tube D1, VR2=VR1, according to calculation formula it is found that working as
When the voltage VBatt_+12V voltage of voltage input end input reaches 25.4V, the voltage on VR1 is 0.7V, resistance R1 two
The voltage difference at end, is just the pressure difference Veb between the emitter e of first switch tube Q1 and base stage b, first switch tube Q1 Veb >=
It is connected when 0.7V.
In a preferred embodiment, above-mentioned switch unit 1b includes: 3rd resistor R3, the 4th resistance R4, second switch
Q2；Wherein, second switch Q2 is p-type metal-oxide-semiconductor, and 3rd resistor R3 is equal with the resistance value of the 4th resistance R4,3rd resistor R3's
One end is connected with the source electrode of the emitter of first switch tube Q1, second switch Q2 respectively, the other end difference of 3rd resistor R3
It is connected with one end of the collector of first switch tube Q1, the base stage of second switch Q2, the 4th resistance R4, the 4th resistance R4's is another
One end ground connection；The drain electrode of second switch Q2 is connected with load；When the voltage of voltage input end input reaches preset threshold, mistake
Onunit 1a conducting is pressed, first switch tube Q1 conducting, 3rd resistor R3 is short-circuit, and second switch Q2 shutdown, load stops work
Make；And when the voltage of voltage input end input is lower than preset threshold, over-voltage onunit 1a shutdown, first switch tube Q1 is closed
Disconnected, 3rd resistor R3 is worked normally, and second switch Q2 conducting, load is started to work.
After first switch tube Q1 conducting, as shown in Figure 1, can be by 3rd resistor R3 short circuit, the voltage at the both ends 3rd resistor R3
For 0V, the voltage at the both ends 3rd resistor R3 is the voltage between the grid G of second switch and source S, Vgs=VR3=0V, second
Switching tube Q2 is not turned on, and load end does not have voltage, and entire supply access is cut off, and plays the role of protecting backend load, into
And play the role of keeping whole system immune to over-voltage and self-shield.
It should be noted that the difference based on specific application environment, the numerical value of above-mentioned component may change, this reality
It is not specifically limited with the novel numerical value to component each in circuit.
In a preferred embodiment, the overvoltage crowbar of the car networking system of the utility model embodiment further include: anti-
It is reversely connected module 2, filter module 3；Wherein, the input terminal of anti-reverse module 2 is connected with voltage input end, anti-reverse module 2 it is defeated
Outlet is connect with filter module 3, and the output end of filter module 3 is connected with the input terminal of overvoltage protective module 1；Anti-reverse module 1
Including diode D2, filter module 2 includes inductance L1, first capacitor C1, the second capacitor C2, and the anode of diode D2 is defeated with voltage
Enter end to be connected, the cathode of diode D2 is connected with one end of inductance L1, the other end of inductance L1 and first capacitor C1 in parallel, the
Two capacitor C2 are connected.
The unilateral conduction that above-mentioned diode D2 has can prevent circuit to be reversely connected, in addition, the utility model is anti-to realizing
The component of reversal connection function is not specifically limited, and in practical application, metal-oxide-semiconductor also can replace above-mentioned diode applications to circuit
In.
And it since the voltage of voltage input end input is not pure direct current, differs greatly with direct current, contains in waveform
Therefore biggish ripple component, referred to as ripple need to obtain more satisfactory DC voltage using above-mentioned filter module 2
To filter out the pulsatile portion in voltage to obtain DC voltage.
The overvoltage crowbar of car networking system in the utility model, by level-one anti-reverse module, secondary filter module
It is constituted with three-level overvoltage protective module, can integrally guarantee that car networking equipment works normally, the mistake that will not occur because of feeder ear
The adverse circumstances of pressure, and equipment of itself is damaged, play the role of self-shield, greatly improves the safe and reliable of onboard system
Property.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: within the spirit and principles of the present invention, still can to technical solution documented by foregoing embodiments into
Row modification, or equivalent substitution of some or all of the technical features；And these are modified or replaceed, and do not make phase
Technical solution is answered to be detached from the protection scope of the utility model.
Claims (4)
1. a kind of overvoltage crowbar of car networking system characterized by comprising overvoltage protective module, load；Wherein
The overvoltage protective module includes over-voltage onunit, switch unit, the input terminal and voltage of the over-voltage onunit
Input terminal is connected, and the output end of the over-voltage onunit is connected with the input terminal of switch unit, the output of the switch unit
End is connected with load；
The over-voltage onunit is configured to the conducting when receiving the voltage greater than or equal to preset threshold, the switch unit
It is configured to the short circuit when the over-voltage onunit is connected to turn off, the load stops working.
2. circuit according to claim 1, which is characterized in that the over-voltage onunit includes: first resistor R1, second
Resistance R2, voltage-stabiliser tube D1, first switch tube Q1；Wherein,
The first switch tube Q1 is PNP type triode, and the first resistor R1 is equal with the resistance value of second resistance R2, described the
One end of one resistance R1 is connected with the emitter of the voltage input end, first switch tube Q1 respectively, and first resistor R1's is another
End is connected with the base stage of the second resistance R2, first switch tube Q1 respectively,
One end of the second resistance R2 is connected with the base stage of the first resistor R1, first switch tube Q1 respectively, and described second
The other end of resistance R2 is connected with the anode of the voltage-stabiliser tube D1, the cathode ground connection of the voltage-stabiliser tube D1；
The emitter of the first switch tube Q1 is also connected with the switch unit with collector；
When the over-voltage onunit receives the voltage greater than or equal to preset threshold, the voltage-stabiliser tube D1 conducting is described
First switch tube Q1 conducting.
3. circuit according to claim 2, which is characterized in that the switch unit include: 3rd resistor, the 4th resistance,
Second switch；Wherein,
The second switch is p-type metal-oxide-semiconductor, and the 3rd resistor R3 is equal with the resistance value of the 4th resistance R4, the third electricity
One end of resistance R3 is connected with the source electrode of the emitter of the first switch tube Q1, the second switch Q2 respectively, the third
The other end of resistance R3 respectively with the collector of the first switch tube Q1, the base stage of second switch Q2, the 4th resistance R4
One end is connected, the other end ground connection of the 4th resistance R4；
The drain electrode of the second switch Q2 is connected with the load；
When the voltage of voltage input end input reaches preset threshold, the over-voltage onunit conducting, described first is opened
Pipe Q1 conducting, the 3rd resistor R3 short circuit are closed, the second switch Q2 is turned off, and the load stops working；And
When the voltage of voltage input end input is lower than preset threshold, the over-voltage onunit shutdown, described first is opened
Pipe Q1 shutdown is closed, the 3rd resistor R3 is worked normally, and the second switch Q2 conducting, the load is started to work.
4. circuit according to claim 1 or 2, which is characterized in that the circuit further include: anti-reverse module, filtering mould
Block；Wherein,
The input terminal of the anti-reverse module is connected with voltage input end, the output end of the anti-reverse module and the filtering mould
Block connection, the output end of the filter module are connected with the input terminal of the overvoltage protective module；
The anti-reverse module includes diode D2, and the filter module includes inductance L1, first capacitor C1, the second capacitor C2,
The anode of the diode D2 is connected with voltage input end, and the cathode of the diode D2 is connected with one end of the inductance L1,
The other end of the inductance L1 is connected with first capacitor C1, the second capacitor C2 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920458933.3U CN209626947U (en) | 2019-04-04 | 2019-04-04 | A kind of overvoltage crowbar of car networking system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920458933.3U CN209626947U (en) | 2019-04-04 | 2019-04-04 | A kind of overvoltage crowbar of car networking system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217178A (en) * | 2020-11-30 | 2021-01-12 | 深圳佑驾创新科技有限公司 | Reverse input protection circuit, integrated circuit chip and stabilized voltage power supply |
| CN114336515A (en) * | 2021-11-30 | 2022-04-12 | 河南嘉晨智能控制股份有限公司 | Overvoltage protection strategy for disconnection of vehicle emergency stop switch |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
-
2019
- 2019-04-04 CN CN201920458933.3U patent/CN209626947U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112217178A (en) * | 2020-11-30 | 2021-01-12 | 深圳佑驾创新科技有限公司 | Reverse input protection circuit, integrated circuit chip and stabilized voltage power supply |
| CN114336515A (en) * | 2021-11-30 | 2022-04-12 | 河南嘉晨智能控制股份有限公司 | Overvoltage protection strategy for disconnection of vehicle emergency stop switch |
| CN114336515B (en) * | 2021-11-30 | 2023-09-01 | 河南嘉晨智能控制股份有限公司 | Overvoltage protection strategy for vehicle emergency stop switch off |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
| CN115140008B (en) * | 2022-09-06 | 2022-12-23 | 万向钱潮股份公司 | Vehicle braking system control device |
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Effective date of registration: 20220324 Address after: 430051 No. b1336, chuanggu startup area, taizihu cultural Digital Creative Industry Park, No. 18, Shenlong Avenue, Wuhan Economic and Technological Development Zone, Wuhan, Hubei Province Patentee after: Yikatong (Hubei) Technology Co.,Ltd. Address before: No.c101, chuanggu start up area, taizihu cultural Digital Industrial Park, No.18 Shenlong Avenue, Wuhan Economic Development Zone, Hubei Province Patentee before: HUBEI ECARX TECHNOLOGY Co.,Ltd. |