CN208539545U - A kind of vehicle load overcurrent protective device - Google Patents
A kind of vehicle load overcurrent protective device Download PDFInfo
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- CN208539545U CN208539545U CN201821041870.3U CN201821041870U CN208539545U CN 208539545 U CN208539545 U CN 208539545U CN 201821041870 U CN201821041870 U CN 201821041870U CN 208539545 U CN208539545 U CN 208539545U
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- resistance
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- partial pressure
- operational amplifier
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Abstract
The utility model discloses a kind of vehicle load overcurrent protective devices, comprising: detection resistance, signal amplification unit, voltage comparison unit, processing unit, and load control unit, the voltage difference that signal amplification unit will test the branch pressure voltage TV1 that resistance both ends are divided and voltage TV2 amplifies to obtain voltage Vck, voltage comparison unit detects that voltage Vck sends alarm signal to processing unit greater than after preset value, processing unit sends the first control signal for controlling the load control unit and closing to load control unit after receiving alarm signal, processing unit detects the AD value of voltage Vck partial pressure beyond the second signal processed for sending the control load control unit closing after preset value to load control unit, vehicle load overcurrent protective device provided by the utility model can effectively be prevented The short circuit and over-current phenomenon avoidance damage caused by vehicle load only occurred in circuit.
Description
Technical field
The utility model relates to vehicle electric fields, are in more detail related to a kind of vehicle load overcurrent protective device.
Background technique
It is well known that on automobile the different demands that automobile uses can be met equipped with a variety of load equipments.For example, windscreen wiper
Device, lamplight component etc. are all necessary load equipments on automobile.But existing vehicle load always will appear the feelings of failure
Condition, majority are that there is no corresponding protection mechanisms because of existing vehicle load control circuit.After automobile long-time use, vehicle
Many electric wires in body will appear aging, it is possible to which the phenomenon that there are crackle or broken skins be easy to cause short circuit；On the other hand,
High power load will appear biggish starting current when starting, and over-current phenomenon avoidance occurs, it is also possible to make to the normal work of circuit
At damage
In conclusion this field needs the new vehicle load overcurrent protective device of one kind to solve the above problems.
Utility model content
The purpose of this utility model is to provide a kind of vehicle load overcurrent protective device, can effectively prevent going out in circuit
Existing short circuit and over-current phenomenon avoidance are damaged caused by vehicle load, are provided safeguard for the normal work of vehicle load, and automobile is extended
The service life of load.
To achieve the goals above, the utility model provides a kind of vehicle load overcurrent protective device comprising:
Detection resistance, front end partial pressure unit, rear end partial pressure unit, first follow unit, second to follow unit, signal amplification
Unit, voltage comparison unit, partial pressure unit, processing unit and load control unit, wherein one end of the detection resistance with
The front end partial pressure unit electrical connection, the other end of the detection resistance are electrically connected with the rear end partial pressure unit, and described first
The non-inverting input terminal of unit is followed to be electrically connected with the front end partial pressure unit, described second follows the non-inverting input terminal of unit and institute
The electrical connection of rear end partial pressure unit is stated, described first follows the inverting input terminal of the output end of unit and signal amplification unit electricity
Connection, described second follows the output end of unit and the non-inverting input terminal of the signal amplification unit to be electrically connected, and the signal is put
The output end of big unit is electrically connected with the input terminal of the voltage comparison unit, the input terminal of the partial pressure unit and the voltage
The input terminal of comparing unit is electrically connected, the output end of the output end of the voltage comparison unit and the partial pressure unit respectively with institute
Processing unit electrical connection is stated, the processing unit is electrically connected with the load control unit；
The front end partial pressure unit and the rear end partial pressure unit carry out dividing to the voltage at the detection resistance both ends
Voltage TV1 and voltage TV2 are not obtained, and the voltage difference of voltage TV1 and voltage TV2 are amplified to obtain by the signal amplification unit
Voltage Vck, the voltage comparison unit are preset with reference voltage Vref, and the voltage comparison unit is by voltage Vck and with reference to electricity
Pressure Vref compares, if voltage Vck voltage is higher than reference voltage Vref, illustrates occur overcurrent or short circuit in circuit, at this time
The voltage comparison unit sends alarm signal to the processing unit, and it is backward that the processing unit receives the alarm signal
The load control unit sends first control signal, and the first control signal controls the load control unit and closes；
For output voltage division signal to the processing unit, the processing is single after the partial pressure unit is divided voltage Vck
Member includes an AD conversion module, and the AD conversion module acquires the voltage division signal in real time and is AD converted, when the partial pressure
When the AD value of signal is higher than preset value, the processing module sends second control signal to the load control unit, and described the
Two control signals control the load control unit and close.
A preferred embodiment according to the present utility model, the load control unit are wiper control circuit, the rain
Scraping control circuit includes fast shelves control module, slow/interval shelves control module and spray control module.
Another preferred embodiment according to the present utility model, the load control unit are lighting control circuit.
The above-mentioned and other purpose of the utility model, feature, advantage will in the following detailed description, attached drawing and
The attached claims further clarify.
Detailed description of the invention
Fig. 1 is the circuit diagram of preferred embodiment according to the present utility model.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to utility model, it should be noted that
Under the premise of not colliding, new reality can be formed between various embodiments described below or between each technical characteristic in any combination
Apply example.
It is described below for disclosing the utility model so that those skilled in the art can be realized the utility model.It retouches below
Preferred embodiment in stating is only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It is retouched following
The basic principle of the utility model defined in stating can be applied to other embodiments, deformation scheme, improvement project, etc. Tongfangs
The other technologies scheme of case and the spirit and scope without departing from the utility model.
It will be understood by those skilled in the art that in the exposure of the utility model, term " longitudinal direction ", " transverse direction ", "upper",
The orientation or position of the instructions such as "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
Above-mentioned term should not be understood as limiting the present invention.
It is understood that term " one " is interpreted as " at least one " or " one or more ", i.e., in one embodiment,
The quantity of one element can be one, and in a further embodiment, the quantity of the element can be it is multiple, term " one " is no
It can be interpreted as the limitation to quantity.
Referring to Fig. 1 of attached drawing, the vehicle load overcurrent protective device of preferred embodiment according to the present utility model will connect
It is elucidated in the description got off, the vehicle load overcurrent protective device can effectively prevent the short circuit occurred in circuit and overcurrent
Phenomenon is damaged caused by electrical equipment, is provided safeguard for the normal work of electrical equipment, is extended the service life of electrical equipment.
The vehicle load overcurrent protective device includes detection resistance RJ, front end partial pressure unit, rear end partial pressure unit, first
Unit, second is followed to follow unit, signal amplification unit, voltage comparison unit, partial pressure unit, processing unit and load control
Unit processed.One end of the detection resistance RJ is electrically connected with the front end partial pressure unit, the other end of the detection resistance RJ with
The rear end partial pressure unit electrical connection, described first follows the non-inverting input terminal of unit to be electrically connected with the front end partial pressure unit,
Described second follows the non-inverting input terminal of unit to be electrically connected with the rear end partial pressure unit.
Described first follows the output end of unit and the inverting input terminal of the signal amplification unit to be electrically connected, and described second
The output end of unit and the non-inverting input terminal of the signal amplification unit is followed to be electrically connected.The output end of the signal amplification unit
It is electrically connected with the input terminal of the voltage comparison unit, the input of the input terminal of the partial pressure unit and the voltage comparison unit
End electrical connection.The output end of the voltage comparison unit and the output end of the partial pressure unit are electrically connected with the processing unit respectively
It connects.The processing unit is electrically connected with the load control unit, for controlling the switch state of the load control unit.
The processing unit is single-chip microcontroller.
Specifically, the front end partial pressure unit includes resistance R1, resistance R3 and capacitor C1；The rear end partial pressure
Unit includes resistance R2, resistance R4 and capacitor C2.One end of resistance R1 connects one end of the detection resistance RJ, resistance R2
One end connect the other end of the detection resistance RJ.The other end of resistance R1 is series at one end of resistance R3, and capacitor C1 is in parallel
It is grounded in the other end of resistance R3, resistance R3；The other end of resistance R2 is series at one end of resistance R4, and capacitor C2 is parallel to resistance
The other end of R4, resistance R4 are grounded.
Described first follows unit for operational amplifier U1, and described second follows unit for operational amplifier U2.Operation is put
The non-inverting input terminal of big device U1 is connected to the other end of resistance R1, and the non-inverting input terminal of operational amplifier U2 is connected to resistance R2's
The other end.
The signal amplification unit includes resistance R5, resistance R6, resistance R7, resistance R8 and operational amplifier U3.Resistance
The output end of one end connection operational amplifier U1 of R5, the other end connect the inverting input terminal of operational amplifier U3.Resistance R6's
One end connects the output end of operational amplifier U2, and the other end connects the non-inverting input terminal of operational amplifier U3.One end of resistance R8
The inverting input terminal of operational amplifier U3 is connected, the other end connects the output end of operational amplifier U3.One end of resistance R7 connects
The non-inverting input terminal of operational amplifier U3, other end ground connection.
The voltage comparison unit includes resistance R10, resistance R11, capacitor C3 and operational amplifier U4.Resistance R10 and
Resistance R11 series connection, the other end of resistance R10 connect power supply VCC, the other end ground connection of resistance R11, and capacitor C3 is parallel to resistance
R11.The inverting input terminal of operational amplifier U4 is connected to capacitor C3, and the non-inverting input terminal of operational amplifier U4 connects operation amplifier
The output end of device U3, the output end of operational amplifier U4 are connected to the processing unit.
The partial pressure unit includes resistance R13, resistance R14.The output of one end connection operational amplifier U3 of resistance R13
End, the other end connect the processing unit.One end of resistance R14 connects resistance R13, other end ground connection.
The working principle of vehicle load overcurrent protective device provided by the utility model is as follows:
The voltage at the both ends the detection resistance RJ can change with the curent change for flowing through the detection resistance RJ,
Therefore the current conditions in current circuit can be detected by the detection resistance RJ.
The front end partial pressure unit and the rear end partial pressure unit divide the voltage at the both ends the detection resistance RJ
Respectively obtain voltage TV1 and voltage TV2.Voltage TV1 and voltage TV2 passes through operational amplifier U1's and operational amplifier U2 respectively
Following effect is input to the signal amplification unit.The signal amplification unit carries out the voltage difference of voltage TV1 and voltage TV2
Amplification obtains voltage Vck.
Biggish overload current is often generated in the start-up course of electrical equipment.Resistance R10 and R11, which are divided, to be compared
Compared with reference voltage Vref, the size of current when reference voltage Vref can be worked normally according to the load control unit is set
It is fixed.The voltage comparison unit compares voltage Vck with reference voltage Vref, if voltage Vck voltage is higher than reference voltage
Vref then illustrates that overcurrent or short circuit occurs on startup in circuit.The voltage comparison unit sends to the processing unit and reports
Alert signal.The processing unit receives and sends first control signal, institute to the load control unit after the alarm signal
It states first control signal and controls the load control unit closing.
It will be appreciated by persons skilled in the art that the voltage comparison unit can be by exporting the processing unit
The information for occurring over-current phenomenon avoidance in circuit is transmitted to the processing unit by the mode of high level signal or low level signal.It is preferred that
Ground, when voltage Vck voltage is higher than reference voltage Vref, the voltage comparison unit is exported to described in the processing module at this time
Alarm signal is high level.In other possible embodiments, when voltage Vck voltage is higher than reference voltage Vref, the electricity
It is low level that pressure comparing unit, which is exported to the alarm signal of the processing unit,.
The partial pressure unit exports voltage division signal to the processing unit after being divided voltage Vck.The processing is single
Member includes an AD conversion module, and the AD conversion module, which acquires the voltage division signal in real time and carries out AD to the voltage division signal, to be turned
It changes.When the AD value of the voltage division signal is higher than preset value, illustrate that overcurrent or short circuit occurs in normal operation in circuit, this
Shi Suoshu processing unit sends second control signal to the load control unit, and the second control signal controls the load
Control unit is closed.
In the preferred embodiment, the load control unit is implemented as wiper control circuit.The windscreen wiper control electricity
Road includes fast shelves control module, slow/interval shelves control module and spray control module.The first control signal and described
Second control signal can control the fast shelves control module, slow/interval shelves control module and spray for closing wiper controller
Control module avoids the short circuit occurred in circuit and over-current phenomenon avoidance from damaging wiper control circuit.
In other preferred embodiments, the load control unit also may be implemented as lighting control circuit.Institute
Closing lighting control circuit can be controlled by stating first control signal and the second control signal.
It will be readily appreciated by those skilled in the art that the lighting control circuit can control dipped headlight, high beam, mist
Lamp, turn signal, brake lamp and back-up lamp etc..
It should be understood by those skilled in the art that foregoing description and the embodiments of the present invention shown in the drawings are only used as
It illustrates and is not intended to limit the utility model.The purpose of this utility model completely and effectively realizes.The function of the utility model
Energy and structural principle show and illustrate in embodiment, under without departing from the principle, the embodiments of the present invention
Can there are any deformation or modification.
Claims (4)
1. a kind of vehicle load overcurrent protective device characterized by comprising
Detection resistance, front end partial pressure unit, rear end partial pressure unit, first follow unit, second to follow unit, signal amplification single
Member, voltage comparison unit, partial pressure unit, processing unit and load control unit, wherein one end of the detection resistance and institute
State the electrical connection of front end partial pressure unit, the other end of the detection resistance is electrically connected with the rear end partial pressure unit, described first with
Be electrically connected with the non-inverting input terminal of unit with the front end partial pressure unit, described second follow the non-inverting input terminal of unit with it is described
The electrical connection of rear end partial pressure unit, described first follows the output end of unit and the inverting input terminal of the signal amplification unit to be electrically connected
It connects, described second follows the output end of unit and the non-inverting input terminal of the signal amplification unit to be electrically connected, the signal amplification
The output end of unit is electrically connected with the input terminal of the voltage comparison unit, the input terminal of the partial pressure unit and the voltage ratio
Input terminal compared with unit is electrically connected, the output end of the output end of the voltage comparison unit and the partial pressure unit respectively with it is described
Processing unit electrical connection, the processing unit are electrically connected with the load control unit；
The front end partial pressure unit and the rear end partial pressure unit divide the voltage at the detection resistance both ends to be obtained respectively
To voltage TV1 and voltage TV2, the signal amplification unit amplifies the voltage difference of voltage TV1 and voltage TV2 to obtain voltage
Vck, the voltage comparison unit detects that voltage Vck sends alarm signal to the processing unit greater than after preset value, described
Processing unit receives and sends first control signal, the first control letter to the load control unit after the alarm signal
Number control load control unit is closed；
Output voltage division signal to the processing unit, the processing unit is examined after the partial pressure unit is divided voltage Vck
Measure the voltage division signal AD value be higher than preset value after to the load control unit send second control signal, described second
It controls signal and controls the load control unit closing.
2. vehicle load overcurrent protective device as described in claim 1, which is characterized in that the load control unit is windscreen wiper
Control circuit, the wiper control circuit include fast shelves control module, slow/interval shelves control module and spray control module.
3. vehicle load overcurrent protective device as described in claim 1, which is characterized in that the load control unit is light
Control circuit.
4. the vehicle load overcurrent protective device as described in any one of claim 1-3, which is characterized in that the front end partial pressure
Unit includes resistance R1, resistance R3 and capacitor C1, and the rear end partial pressure unit includes resistance R2, resistance R4 and capacitor
C2；One end of resistance R1 connects one end of the detection resistance RJ, and one end of resistance R2 connects the another of the detection resistance RJ
End；The other end of resistance R1 is series at one end of resistance R3, and capacitor C1 is parallel to resistance R3, the other end ground connection of resistance R3；Electricity
The other end of resistance R2 is series at one end of resistance R4, and capacitor C2 is parallel to resistance R4, the other end ground connection of resistance R4；
Described first follows unit for operational amplifier U1, and described second follows unit for operational amplifier U2；Operational amplifier
The non-inverting input terminal of U1 is connected to the other end of resistance R1, and the non-inverting input terminal of operational amplifier U2 is connected to the another of resistance R2
End；
The signal amplification unit includes resistance R5, resistance R6, resistance R7, resistance R8 and operational amplifier U3；Resistance R5's
One end connects the output end of operational amplifier U1, and the other end connects the inverting input terminal of operational amplifier U3；One end of resistance R6
The output end of operational amplifier U2 is connected, the other end connects the non-inverting input terminal of operational amplifier U3；One end of resistance R8 connects
The inverting input terminal of operational amplifier U3, the other end connect the output end of operational amplifier U3；One end of resistance R7 connects operation
The non-inverting input terminal of amplifier U3, other end ground connection；
The voltage comparison unit includes resistance R10, resistance R11, capacitor C3 and operational amplifier U4；Resistance R10 and resistance
R11 series connection, the other end of resistance R10 connect power supply VCC, the other end ground connection of resistance R11, and capacitor C3 is parallel to resistance R11；Fortune
The inverting input terminal for calculating amplifier U4 is connected to capacitor C3, the non-inverting input terminal connection operational amplifier U3's of operational amplifier U4
Output end, the output end of operational amplifier U4 are connected to the processing unit；
The partial pressure unit includes resistance R13, resistance R14, and one end of resistance R13 connects the output end of operational amplifier U3, separately
One end connects the processing unit；One end of resistance R14 connects resistance R13, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821041870.3U CN208539545U (en) | 2018-07-03 | 2018-07-03 | A kind of vehicle load overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821041870.3U CN208539545U (en) | 2018-07-03 | 2018-07-03 | A kind of vehicle load overcurrent protective device |
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| Publication Number | Publication Date |
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| CN208539545U true CN208539545U (en) | 2019-02-22 |
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| CN201821041870.3U Active CN208539545U (en) | 2018-07-03 | 2018-07-03 | A kind of vehicle load overcurrent protective device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467687A (en) * | 2020-11-13 | 2021-03-09 | 杭州春来科技有限公司 | Load equipment protection circuit and electronic equipment |
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2018
- 2018-07-03 CN CN201821041870.3U patent/CN208539545U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467687A (en) * | 2020-11-13 | 2021-03-09 | 杭州春来科技有限公司 | Load equipment protection circuit and electronic equipment |
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