CN207902325U - A kind of low soft starting circuit suitable for onboard system - Google Patents
A kind of low soft starting circuit suitable for onboard system Download PDFInfo
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- CN207902325U CN207902325U CN201721124815.6U CN201721124815U CN207902325U CN 207902325 U CN207902325 U CN 207902325U CN 201721124815 U CN201721124815 U CN 201721124815U CN 207902325 U CN207902325 U CN 207902325U
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Abstract
The utility model provides a kind of low soft starting circuit suitable for onboard system, belongs to electric vehicle controller field.The utility model includes power supply, switch, fuse and load, further includes soft-start module, wherein the switch, fuse, soft-start module and load are sequentially connected in series in power output end, and the soft-start module is inductance.The beneficial effects of the utility model are：At low cost, small, circuit structure is simple, it is easy to accomplish, starting current has been solved perfectly and has burnt out fuse problem greatly, has ensured safety and the reliability of the low-voltage circuit of vehicle.
Description
Technical field
It opens the utility model is related to electric vehicle controller field more particularly to a kind of low electricity suitable for onboard system are soft
Dynamic circuit.
Background technology
Existing low tension routing power, switch, fuse and load composition, when capacitive load very little, close a switch,
Also very little, fuse are unaffected for starting current；However when capacitive load is bigger, the moment to close a switch, starting current
It is very big, it can blowout.
Utility model content
To solve the problems, such as that onboard system is because the big blowout of starting current, the utility model provide one in the prior art
Low soft starting circuit of the kind suitable for onboard system.
The utility model includes power supply, switch, fuse and load, further includes soft-start module, wherein the switch,
Fuse, soft-start module and load are sequentially connected in series in power output end.
The utility model is further improved, and the soft-start module is inductance.
The utility model is further improved, and further includes immunity module and anti-reverse protection module, the anti-interference mould
The input terminal of block is connected with the output end of soft-start module, and the immunity module output end is by anti-reverse protection module and bears
Carry concatenation.
The utility model is further improved, and the immunity module is common mode inductance L2.
The utility model is further improved, and the anti-reverse protection module includes metal-oxide-semiconductor Q1, diode D, two pole of voltage stabilizing
Pipe D2, resistance R1, resistance R2 and polar capacitor C, wherein the source electrode and drain electrode of the metal-oxide-semiconductor Q1 respectively with the both ends diode D simultaneously
After connecing, one termination common mode inductance the first output ends of L2, the other end respectively with zener diode D2 anodes, capacitance C1, resistance R2, bear
Carry one end, polar capacitor C cathode are connected, the grid of the metal-oxide-semiconductor Q1 respectively with zener diode D2 cathode, capacitance C1, resistance
The R2 other ends are connected with the one end resistance R1, the common mode inductance L2 second output terminals respectively with the resistance R1 other ends, polar capacitor C
Anode is connected with the load other end.
The utility model is further improved, and further includes oscillation cancellation module, the oscillation cancellation module and soft start mould
Block is in parallel.
The utility model is further improved, and the oscillation cancellation module is diode, wherein the diode cathode connects
Fuse.
Compared with prior art, the utility model has the beneficial effects that：At low cost, small, circuit structure is simple, is easy to
It realizes, starting current has been solved perfectly and has burnt out fuse problem greatly, has ensured safety and the reliability of the low-voltage circuit of vehicle.
Description of the drawings
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is one embodiment circuit diagram of the utility model.
Specific implementation mode
The utility model is described in further details with reference to the accompanying drawings and examples.
As shown in Figure 1, the utility model includes power supply, switch, fuse and load, further include soft-start module, wherein
The switch, fuse, soft-start module and load are sequentially connected in series in power output end.Further include oscillation cancellation module, resists dry
Module and anti-reverse protection module are disturbed, the oscillation cancellation module is in parallel with soft-start module, the input of the immunity module
End is connected with the output end of soft-start module, and the immunity module output end is concatenated by anti-reverse protection module with load.
As shown in Fig. 2, as an embodiment of the present invention, the soft-start module is inductance L1, the oscillation is eliminated
Module is diode D1, wherein the diode D1 cathode connect fuse, and the immunity module is common mode inductance L2.
Anti-reverse protection module described in this example includes metal-oxide-semiconductor Q1, diode D, zener diode D2, resistance R1, resistance R2
With polar capacitor C, wherein the source electrode and drain electrode of the metal-oxide-semiconductor Q1 is respectively with the both ends diode D and after connecing, a termination common mode electricity
Feel the first output ends of L2, the other end respectively with zener diode D2 anodes, capacitance C1, resistance R2, load one end, polar capacitor C
Cathode is connected, the grid of the metal-oxide-semiconductor Q1 respectively with zener diode D2 cathode, capacitance C1, the resistance R2 other ends and resistance R1
One end is connected, the common mode inductance L2 second output terminals respectively with the resistance R1 other ends, polar capacitor C anode and the load other end
It is connected.
The soft start principle of this example is：
Close a switch S1, because inductance L1 has the characteristic that electric current cannot be mutated, switch S1 can be inhibited to close opening for moment
Streaming current, slowly charging terminates polar capacitor C until charging；
Capacitance is since charging, inductance L1 and polar capacitor C energy storage, after, the voltage at the both ends polar capacitor C can be higher than
Supply voltage causes LC self-oscillations；The effect that this example increases diode D1 is to vise the voltage at the both ends polar capacitor C, makes it
Close to supply voltage, the electric current on inductance L1 is discharged by diode D1 afterflows.
This example increases the electromagnetic interference that L2 inductance can effectively inhibit external, while it is dry to avoid itself from sending out noise to outside
It disturbs.Reverse connection prevention protection circuit used in this example, by N-channel MOS pipe Q1, voltage-stabiliser tube D2, resistance R1, R2 and capacitance C1 compositions are main
Syllabus is to prevent reverse power connection from damaging circuit.
The operation principle of the anti-reverse protection module of this example is：
Close a switch S1, and the parasitic diode D conductings of metal-oxide-semiconductor Q1, the Vds of metal-oxide-semiconductor Q1 is 0.6V or so, and DC+ passes through R1
It is divided with R2 and provides driving voltage to metal-oxide-semiconductor Q1, driving voltage is more than the threshold values of Ugs, between the source electrode and drain electrode of metal-oxide-semiconductor Q1 just
It can be connected, the effect of voltage-stabiliser tube D2 is to prevent the excessively high breakdown metal-oxide-semiconductor of grid voltage, due to internal resistance very little, so parasitic diode D
By the poles DS of metal-oxide-semiconductor Q1（Source electrode and drain electrode）Short circuit, pressure drop are almost 0, and very little is lost；When power supply is reversed, metal-oxide-semiconductor Q1 will not
Conducting, and load cannot be formed into a loop, to ensure circuit safety.
The utility model really solves in onboard system and burns out fuse because starting current is big, whole to ensure that
The safety of vehicle control powers on；And the self-oscillation that LC is brought can be effectively eliminated using anti-parallel diodes.
In addition, the utility model uses the soft starting circuit that inductance characteristic is done, without load loss；It is applicable not only to vehicle-mounted
The control section power supply of system, is equally applicable in other low-voltage power supply systems.
All include capacitance, this example because the load in onboard system is most of as another embodiment of the utility model
Before the load including capacitance directly with inductance L1 and connect oscillation cancellation module, save intermediate immunity module and anti-reverse
Protection module also can effectively realize the soft start of low electric power supply, avoid burning out fuse because starting current is big, to ensure
The safety of whole-control system powers on.
Compared with prior art, the utility model has the beneficial effects that：At low cost, small, circuit structure is simple, is easy to
It realizes, starting current has been solved perfectly and has burnt out fuse problem greatly, has ensured safety and the reliability of the low-voltage circuit of vehicle.
The specific implementation mode of the above is the better embodiment of the utility model, and it is new not to limit this practicality with this
The specific implementation range of type, the scope of the utility model includes being not limited to present embodiment, all according to the utility model
Made by equivalence changes it is within the protection scope of the present utility model.
Claims (6)
1. a kind of low soft starting circuit suitable for onboard system, including power supply, switch, fuse and load, feature exist
In：Further include soft-start module, wherein the switch, fuse, soft-start module and load are sequentially connected in series to be exported in power supply
End, further includes immunity module and anti-reverse protection module, the output of the input terminal and soft-start module of the immunity module
End is connected, and the immunity module output end is concatenated by anti-reverse protection module with load.
2. low soft starting circuit according to claim 1, it is characterised in that：The soft-start module is inductance.
3. low soft starting circuit according to claim 1, it is characterised in that：The immunity module is common mode inductance
L2。
4. low soft starting circuit according to claim 3, it is characterised in that：The anti-reverse protection module includes MOS
Pipe Q1, diode D, zener diode D2, resistance R1, resistance R2 and polar capacitor C, wherein the source electrode of the metal-oxide-semiconductor Q1 and leakage
Pole is respectively with the both ends diode D and after connecing, termination common mode inductance first output ends of L2, the other end respectively with zener diode D2
Anode, capacitance C1, resistance R2, load one end, polar capacitor C cathode are connected, the grid of the metal-oxide-semiconductor Q1 respectively with two pole of voltage stabilizing
Pipe D2 cathode, capacitance C1, the resistance R2 other ends are connected with the one end resistance R1, the common mode inductance L2 second output terminals respectively with electricity
The resistance R1 other ends, polar capacitor C anodes are connected with the load other end.
5. according to the low soft starting circuit of claim 1-4 any one of them, it is characterised in that：Further include that mould is eliminated in oscillation
Block, the oscillation cancellation module are in parallel with soft-start module.
6. low soft starting circuit according to claim 5, it is characterised in that：The oscillation cancellation module is diode,
Wherein, the diode cathode connects fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124815.6U CN207902325U (en) | 2017-09-04 | 2017-09-04 | A kind of low soft starting circuit suitable for onboard system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124815.6U CN207902325U (en) | 2017-09-04 | 2017-09-04 | A kind of low soft starting circuit suitable for onboard system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207902325U true CN207902325U (en) | 2018-09-25 |
Family
ID=63570087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721124815.6U Active CN207902325U (en) | 2017-09-04 | 2017-09-04 | A kind of low soft starting circuit suitable for onboard system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207902325U (en) |
-
2017
- 2017-09-04 CN CN201721124815.6U patent/CN207902325U/en active Active
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