CN209683561U - A kind of control device that driving automobile rearview mirror pedestal folds - Google Patents
A kind of control device that driving automobile rearview mirror pedestal folds Download PDFInfo
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- CN209683561U CN209683561U CN201920039437.4U CN201920039437U CN209683561U CN 209683561 U CN209683561 U CN 209683561U CN 201920039437 U CN201920039437 U CN 201920039437U CN 209683561 U CN209683561 U CN 209683561U
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Abstract
The utility model provides a kind of control device that driving automobile rearview mirror pedestal folds, and can satisfy the function that eliminating automobile external back mirrow pedestal is upheld and is folded inward outward by the polarity of voltage conversion circuit of design；It is connect respectively with logical-arithmetic unit by the first current foldback circuit, the second current foldback circuit simultaneously, which realizes or calculation function, and the resetting end of logical-arithmetic unit and self-hold circuit connects, and can play the role of overcurrent protection to control circuit；The self-hold circuit of the utility model is distinguished the first power transistor and the second power transistor by driving circuit and is connected, and realizes the conducting of motor circuit, being capable of intelligently drive motor；The utility model provides a kind of control circuit of simple, the lower-cost driving automobile rearview mirror pedestal folding of structure by above structure.
Description
Technical field
The utility model belongs to control circuit technical field, in particular to a kind of control that driving automobile rearview mirror pedestal folds
Device processed.
Background technique
The past two during the decade, there is the researcher in more and more fields to start to carry out vehicle rear-view mirror appearance and function
Research, blank product are developed successively.The quality and function of vehicle rear-view mirror, are related to the side of vehicle traveling direction
The condition informations such as other people, thing, object that cut-off are arranged at face, back and bottom, which requires dependence vehicle rear-view mirror and convey at any time
To driver, thus it is closely bound up with the traffic safety of driver.The good vehicle rear-view mirror of performance, which would generally provide, to be driven
The broader and farther away visible sensation distance of the person of sailing reduces the possibility probability that traffic accident occurs for driver.With Global Auto electronics
Development, the performance and appearance of vehicle rear-view mirror also therefore constantly improve and update.Traditional electric car rear-view mirror system can
Driver's function that can adjust deflection mirror surface angle according to personal height and hobby is provided, is widely installed in
In, on low price vehicle；In recent years, the design of Geng You Foreign Automobile manufactory not only provides driver and adjusts Vehicular rearview
The control system of mirror two-axis deflection angle function, and two-axis deflection angle note is also added into vehicle rear-view mirror control system
The function of recalling and restore, but since the unit price of product can not have always been high any more, so also only limitation is provided at up to now
On more advanced or monovalent higher vehicle.Therefore how to design the control that simple and effective, lower-cost rearview mirror pedestal folds
Circuit processed becomes the hot spot of recent research.
Utility model content
A kind of the technical problem to be solved by the utility model is to provide structures simple, lower-cost driving automobile
The control circuit that rearview mirror pedestal folds.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows:
The utility model provides a kind of control device that driving automobile rearview mirror pedestal folds, including power supply, voltage pole
Property conversion circuit, the first current foldback circuit, the second current foldback circuit, logical-arithmetic unit, self-hold circuit, driving circuit,
The motor that first power transistor, the second power transistor and driving rearview mirror pedestal fold；
The positive pole is connect with the first input end of polarity of voltage conversion circuit, the power cathode and polarity of voltage
Second input terminal of conversion circuit connects；
First output end of the polarity of voltage conversion circuit is connect with one end of the first current foldback circuit, and described first
The other end of current foldback circuit is connect with one end of the first power transistor, the other end of first power transistor and horse
One end connection reached；
The second output terminal of the polarity of voltage conversion circuit is connect with one end of the second current foldback circuit, and described second
The other end of current foldback circuit is connect with one end of the second power transistor, the other end of first power transistor and horse
The other end connection reached；
First current foldback circuit and the second current foldback circuit pass through logical-arithmetic unit and self-hold circuit respectively
Connection；
The self-hold circuit is connect with the polarity of voltage conversion circuit and the driving circuit respectively, the driving electricity
Road is connect with the first power transistor and the second power transistor respectively.
Effective effect of the utility model are as follows:
The utility model provides a kind of control device that driving automobile rearview mirror pedestal folds, and passes through the voltage pole of design
Property conversion circuit can satisfy the function that eliminating automobile external back mirrow pedestal is upheld and is folded inward outward；Pass through the first overcurrent simultaneously
Protection circuit, the second current foldback circuit are connect with logical-arithmetic unit respectively, which realizes or calculation function, and patrols
The resetting end for collecting arithmetic unit and self-hold circuit connects, and can play the role of overcurrent protection to control circuit；The utility model
Self-hold circuit the first power transistor and the second power transistor distinguished by driving circuit connect, realize motor circuit
Conducting, being capable of intelligently drive motor；The utility model provides that a kind of structure is simple, lower-cost drive by above structure
The control circuit that electrical automobile rearview mirror pedestal folds.
Detailed description of the invention
Fig. 1 is the structural representation for the control device that a kind of driving automobile rearview mirror pedestal of the utility model embodiment folds
Figure；
Fig. 2 is the structural schematic diagram that the polarity of voltage conversion circuit of the utility model embodiment connects to power supply；
Fig. 3 is that first current foldback circuit of the utility model embodiment and the second current foldback circuit are transported with logic respectively
Calculate the structural schematic diagram of device connection；
Fig. 4 is first power transistor of the utility model embodiment and the second power transistor is connect with motor respectively
Structural schematic diagram；
Fig. 5 is the structural schematic diagram that the self-hold circuit of the utility model embodiment is connect with optically coupled circuit；
Fig. 6 is the structural schematic diagram of first driving circuit of the utility model embodiment；
Fig. 7 is the structural schematic diagram of second driving circuit of the utility model embodiment；
Label declaration:
1, power supply；2, polarity of voltage conversion circuit；3, the first current foldback circuit；4, the second current foldback circuit；5, it patrols
Collect arithmetic unit；6, self-hold circuit；7, driving circuit；8, the first power transistor；9, the second power transistor；10, motor；
11, optically coupled circuit.
Specific embodiment
For technology contents, the objects and the effects that the utility model is described in detail, below in conjunction with embodiment and match
Attached drawing is closed to be explained.
The key ideas of the utility model are as follows: power supply successively with polarity of voltage conversion circuit, two current foldback circuits, function
Rate transistor is connected with motor, and two current foldback circuits pass through or logical-arithmetic unit is connect with self-hold circuit, self-sustaining
Circuit is connect with the control terminal of polarity of voltage conversion circuit, while self-hold circuit is connected by driving circuit and power transistor
It connects.
Fig. 1 to Fig. 7 is please referred to, the utility model provides a kind of control device that driving automobile rearview mirror pedestal folds,
Including power supply, polarity of voltage conversion circuit, the first current foldback circuit, the second current foldback circuit, logical-arithmetic unit, self-sustaining
The motor that circuit, driving circuit, the first power transistor, the second power transistor and driving rearview mirror pedestal fold；
The positive pole is connect with the first input end of polarity of voltage conversion circuit, the power cathode and polarity of voltage
Second input terminal of conversion circuit connects；
First output end of the polarity of voltage conversion circuit is connect with one end of the first current foldback circuit, and described first
The other end of current foldback circuit is connect with one end of the first power transistor, the other end of first power transistor and horse
One end connection reached；
The second output terminal of the polarity of voltage conversion circuit is connect with one end of the second current foldback circuit, and described second
The other end of current foldback circuit is connect with one end of the second power transistor, the other end of first power transistor and horse
The other end connection reached；
First current foldback circuit and the second current foldback circuit pass through logical-arithmetic unit and self-hold circuit respectively
Connection；
The self-hold circuit is connect with the polarity of voltage conversion circuit and the driving circuit respectively, the driving electricity
Road is connect with the first power transistor and the second power transistor respectively.
As can be seen from the above description, the utility model provides a kind of control device that driving automobile rearview mirror pedestal folds,
It can satisfy the function that eliminating automobile external back mirrow pedestal is upheld and is folded inward outward by the polarity of voltage conversion circuit of design
(motor rotates forward rearview mirror pedestal and upholds/be folded inward outward, and motor reversion rearview mirror pedestal is folded inward/how upholds outward
Realize that the rearview mirror pedestal structure design principle upholding and be folded inward outward is the prior art, the utility model not to its into
Row improves)；It is connect respectively with logical-arithmetic unit by the first current foldback circuit, the second current foldback circuit simultaneously, the logic
Arithmetic unit is realized or calculation function, and the resetting end of logical-arithmetic unit and self-hold circuit connects, and can play to control circuit
The effect of overcurrent protection；The self-hold circuit of the utility model distinguishes the first power transistor and the second power by driving circuit
Transistor connection, realizes the conducting of motor circuit, being capable of intelligently drive motor；The utility model is provided by above structure
A kind of control circuit of simple, the lower-cost driving automobile rearview mirror pedestal folding of structure.
Further, the polarity of voltage conversion circuit includes first input end, the second input terminal, the first output end,
Two output ends, the first ground terminal, the first control terminal, first diode D1, the second diode D2, third diode D3 and the 4th
Diode D4；
The anode of the power supply is connect with first input end, and the cathode of the power supply is connect with the second input terminal；Described
One input terminal is connect with the anode of the cathode of D1 and D3 respectively；The anode of the D3 is connect with the first output end；
The anode of the D1 is connect with the anode of the first ground terminal and D2 respectively, and the cathode of the D2 and the second input terminal connect
It connects；
The cathode of the D3 is connect with the cathode of the first control terminal and D4 respectively, and the anode of the D4 is inputted with second respectively
End is connected with second output terminal；First control terminal and the first ground terminal are connect with self-hold circuit respectively.
It outward upholds and is folded inward as can be seen from the above description, must have to meet eliminating automobile external back mirrow pedestal
Function.Automobile body both informed that current action which be to be was to fold so that the direct current power source voltage polarity of controller circuitry is added
Or it upholds.On the one hand this circuit function square need to be reserved to the DC voltage supply d.c. motor of vehicle ontology input as work electricity
Source；On the other hand it can also obtain not by voltage that vehicle ontology is added again through full-wave rectifying circuit with vehicle ontology applied voltage polarity
The DC voltage of variation, using the working power as controller circuitry.
The working power of d.c. motor and controller circuitry is all to supply direct current+12V from the battery system of automobile body.
The rotation direction order that vehicle ontology passes to automobile rearview mirror pedestal controller circuitry is also to rely on to change to be actually added into direct current horse
Up to controller circuitry DC voltage polarity do not complete, however, it is contemplated that DC motor controller circuit should simplify as far as possible, no
Pipe vehicle ontology add to d.c. motor source voltage polarity why, the voltage value of the working power of DC motor controller circuit must
It must be unique, and polarity should be also fixed.Though vehicle ontology provide polarity it is variable+12V DC voltage, pass through again
After the processing of polarity of voltage conversion circuit, voltage value and polarity between its output end DC voltage+VP and GND should be fixed
's.
Further, first current foldback circuit include the first over-current detection resistance Rcs1, the first triode Q1 and
7th diode D5；
First output end is connect with one end of the emitter of Q1 and Rcs1 respectively, the other end of the Rcs1 respectively with
The base stage of Q1 is connected with one end of the first power transistor, and the collector of the Q1 and the anode of D5 connect, the cathode of the D5
It is connect with logical-arithmetic unit；
Second current foldback circuit includes the second over-current detection resistance Rcs2, the second triode Q2 and the 8th diode
D6；
The second output terminal is connect with one end of the emitter of Q2 and Rcs1 respectively, the other end of the Rcs2 respectively with
The base stage of Q1 is connected with one end of the first power transistor, and the collector of the Q2 and the anode of D6 connect, the cathode of the D6
It is connect with logical-arithmetic unit；
The Q1 and Q2 is PNP type triode.
As can be seen from the above description, one of major function of DC motor controller circuit of exterior mirror base interior is just
It is that the outer backsight of control vehicle hits pedestal and upholds or be folded inward outward extreme position, because of institute inside rearview mirror foundation means
Design " blocking " mechanism does not allow d.c. motor to continue to rotate, at this point, d.c. motor can not be continued to rotate because of mechanism " blocking "
Generate overcurrent as a result, the current foldback circuit in controller circuitry must generate protection act in time, otherwise, d.c. motor gesture
It must be burnt because of overheat.In order to reduce manufacturing cost, the utility model design has low-resistance fixed resistance using one
(specific resistance value can be adjusted according to actual needs) connects with d.c. motor serves as the task of dynamic DC motor electrical current detecting,
Current sense resistor can increase with electric current because connecting with d.c. motor and reduce partial power input voltage, be added to
The potential difference at d.c. motor both ends reduces and makes the reduction of its revolving speed, due to having lost the electrical power of part external world input, so drop
The whole work efficiency of low controller circuitry is its disadvantage.Once over-current detector resistance, which detects d.c. motor, there is mistake
Situation is flowed, an over-current signal " OC " will be generated immediately, the utility model had both utilized this over-current signal resetting self-sustaining electricity
The interlock function on road, while d.c. motor stopping also being enabled to remain in operation, have the function that overcurrent protection.When exterior mirror pedestal
When having the movement demand upheld or be folded inward outward, car body changes correspondingly to inform the service voltage polarity of rearview mirror pedestal
Controller circuitry, the polarity of voltage that protection circuit can also be supplied with car body changes, and d.c. motor is made to connect different low resistances
Using the current detecting unit as it.
Current foldback circuit design: the method for Motion capture d.c. motor electric current is divided into direct-coupled type and isolated, and two
Kind method respectively has advantage and disadvantage.The utility model considers the cost of manufacture of controller circuitry, so selection is used with low-resistance value
Fixed resistance as d.c. motor current detecting unit, therefore current detecting unit and d.c. motor series connection, flow through two members
The electric current of part should be identical.
Because the operating voltage polarity of d.c. motor can change, two tools have been used altogether on controller circuitry
There is the fixed resistance for resistance value to connect with d.c. motor and captures its dynamic current.Same time only one of which current detecting
Unit can board working condition.Current foldback circuit is when occurring overcurrent condition, at the both ends over-current detection resistance (Rsc1 or Rsc2)
Big forward drop when will generate more normal, this value are commonly designed the voltage that can be greater than the VEB of transistor Q1 or Q2, thus
It begins to turn on transistor Q1 or Q2 and enters saturation region operation, the collector output point voltage of Q1 or Q2 are about power supply electricity
Pressure+VP or so.Assuming that the voltage of the VEB of transistor Q1 or Q2 are current sense resistor and flow through the product of d.c. motor electric current,
That is,Wherein, RSCIndicate the resistance value of over-current detection resistance；ILD.c. motor (motor) is flowed through in expression
Electric current.
As shown from the above formula, the resistance value because being known as current sense resistor of the VEB voltage of transistor Q1 or Q2 is influenced
With flow through d.c. motor current value.Under identical d.c. motor electric current, it can change if changing the resistance value of current sense resistor
Become the time point of current foldback circuit movement；Similar, the base stage current-limiting resistance value of power crystal also can be changed, change direct current horse
The maximum operating currenbt reached is done so however, can not increase the d.c. motor maximum operating currenbt allowed always in addition to that must make
With the cost of manufacture that increase circuit outside the power crystal with larger rated operational current, certainly will be caused.Another situation is
The power crystal with lower capacity operation electric current is selected, and selects the current sense resistor with larger resistance value, by above-mentioned
Formula, it appears that the effect of the available VEB voltage for equally generating identical transistor Q1 or Q2, triggering d.c. motor transition are protected
The purpose of protection circuit movement, does not have ignored, although selecting relatively low d.c. motor operating current and compared with small rated power crystalline substance
Therefore body, manufacturing cost expection can be reduced, but in practical situations, select whether the d.c. motor for comparing low capacity can generate
Enough torsion driving rearview mirror foundation means turn to desired extreme position, and hinder with high current detection resistance
In the case of value, the starting current of d.c. motor may will promote current foldback circuit to act, and d.c. motor just starts not at all
.
Further, the control device that a kind of driving automobile rearview mirror pedestal folds, further includes optically coupled circuit,
The optically coupled circuit includes phototriode Q7；
The connection of the collector of first control terminal and Q7, the emitter of the Q7 and the resetting end of self-hold circuit connect
It connects；The Q7 is NPN type phototriode；
The logical-arithmetic unit includes the 6th resistance R6 and light emitting diode D11；
The cathode of the cathode of the D5 and the D6 are connect with the anode of D11 respectively, the cathode ground connection of the D11.
As can be seen from the above description, when the electric current that the first current foldback circuit or the second current foldback circuit generate is excessive,
It can make lumination of light emitting diode, so that phototriode be made to be connected, reset signal is sent to self-hold circuit, weight by resetting end
The interlock function of self-hold circuit is set, while motor stopping also being enabled to remain in operation, has the function that overcurrent protection.
Further, the control device that a kind of driving automobile rearview mirror pedestal folds, further includes the 7th diode
D7；
The anode of first output end of the polarity of voltage conversion circuit and the D7 are connect, the cathode of the D7 with it is described
The other end of first power transistor connects.
Further, the control device that a kind of driving automobile rearview mirror pedestal folds, further includes the 8th diode
D8；
The second output terminal of the polarity of voltage conversion circuit is connect with the cathode of the D8, the D8 anode with it is described
The other end of second power transistor connects.
As can be seen from the above description, D7 and D8 can be punctured when voltage is excessive by above structure, Q3 and Q4 is short-circuit,
To play the role of being effectively protected.
Further, the control device that a kind of driving automobile rearview mirror pedestal folds further includes the inspection of third overcurrent
Measuring resistance, the 4th over-current detection resistance, the tenth triode and the 11st triode；
The other end of the Rcs1 is connect with one end of third over-current detection resistance, the third over-current detection resistance it is another
The connection of the emitter of one end and Q3, the base stage of the Q3 are connect with the emitter of the tenth triode, the base of the tenth triode
Pole is connect with the first driving end, and the collector of the tenth triode is connected with the collector of Q3, the collector of Q3 and motor
One end connection；
The other end of the Rcs2 is connect with one end of the 4th over-current detection resistance, the 4th over-current detection resistance it is another
The connection of the emitter of one end and Q4, the base stage of the Q4 are connect with the emitter of the 11st triode, the 11st triode
Base stage with second driving end connect, the collector of the 11st triode is connected with the collector of Q4, the collector of Q4 and
The other end of motor connects；Tenth triode and the 11st triode are PNP type triode.
Further, first power transistor is third transistor Q3, the four or three pole of the second power transistor
Pipe Q4；
The Q3 and Q4 is PNP type triode, and the emitter of the Q3 and the other end of Rcs1 connect, the base of the Q3
First driving end connection of pole and driving circuit, the collector of the Q3 and one end of motor connect；
The emitter of the Q4 and the other end of Rcs2 connect, and the base stage of the Q4 and the second driving end of driving circuit connect
It connects, the collector of the Q4 and the other end of motor connect.
As can be seen from the above description, the resistance value at current sense resistor both ends cannot be excessive, because resistance value is excessive in d.c. motor
Pressure drop when movement increases, and the loss of current sense resistor increases, in addition, current sense resistor is excessive, starts in d.c. motor
When line-start electric current will cause current foldback circuit movement.Opposite, if selection is used with the electricity for comparing low resistance
Hinder the current sense resistor as d.c. motor, the electricity of the practical over current protection movement generated to d.c. motor of current foldback circuit
Flow valuve needs are bigger, certainly will need using the power crystal for possessing bigger rated capacity, simplest mode is exactly to use
It is Darlington transistor that two transistors, which collectively constitute Darlington circuit or single, and function will be made by inevitably doing so
The acquisition cost of rate crystal improves.Power crystal is maximum to allow conducting electric current other than operating under safe capacity, it
Output current value is controllable by base current value, in other words, control can be reached by the base resistance values of adjustment power crystal and is held
Permitted to flow through the purpose of d.c. motor current value.
Further, the self-hold circuit include third input terminal, third output end, resetting end, zener diode D9,
9th diode D10, the 5th triode Q5, the 6th triode Q6, first capacitor C3, first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4, the 5th resistance R5, twelfth resistor R12, thirteenth resistor R13 and the second ground terminal；
The third input terminal is connect with the first control terminal, and the anode of the third input terminal and D9 connect, the D9's
Cathode is connect with one end of one end of R12, one end of C3, the anode of D10 and R4 respectively；The transmitting of the cathode and Q5 of the D10
Pole connection, the base stage of the Q5 are connect with the other end of R4, one end of R5 and resetting end respectively, the resetting end and photosensitive three
The emitter of pole pipe connects；The collector of the Q5 is connect with one end of third output end, R2 respectively；
The other end of the R12 is connect with one end of one end of R13, the other end of C3 and R1 respectively；The R1's is another
End is connect with the base stage of the other end of R2, one end of R3 and Q6 respectively；The collector of the Q6 and the other end of R5 connect, described
The emitter of Q6 is connect with the other end of R13, the other end of R3 and the second ground terminal respectively；Second ground terminal connects with first
It is grounded after ground terminal connection；The third output end is connect with driving circuit；
The Q5 is PNP type triode, and the Q6 is NPN type triode.
As can be seen from the above description, the status of the body of backsight mirror control for general automobile at present, automobile body only supply
To+12V and GND, and the polarity by changing supply body of backsight mirror DC power supply is as change rearview mirror d.c. motor steering
Control basis.D.c. motor current foldback circuit has self-retaining function.When moment is added in additional power source, by transistor Q6
Base stage excite a high potential pulse voltage, make transistor Q5 be connected and Vct node export a high voltage potential, electricity
Crystal Q8 or Q9 conducting, node Vc1 or Vc2 export low logic voltage current potential, and main power crystal is promoted to be connected, motor rotation.From
In holding circuit (S-R flip-flop), circuit operation enabling signal by capacitor C3 and resistance R6 form differential circuit add outside+
VP moment generates the positive pulse with narrow width, via current-limiting resistance R1 triggering transistor Q6 conducting.When transistor Q6 is led
Logical, collector current can generate voltage drop at the both ends resistance R4, and the voltage at the both ends R4 just provides transistor Q5 and penetrates-base stage
Q5 is connected greater than VBE (Q5) bias, Vct node exports a high reference voltage, this high reference voltage is because by resistance R2
It is divided with R3, if being established from the voltage drop that the positive pulsation of Q6 input originally can continue until the both ends R3, transistor Q5 and Q6 can
It will be continuously maintained on state, even if the positive pulse wave of triggering of the transistor Q6 of starting is over or disappears, finally, circuit
All the outputting reference voltage of node voltage Vct will be made to be always held at "high" reference potential due to Q5 and Q6 is persistently held on.
Resetting (RESET) Functional Design of self-hold circuit:
Motor current detection resistance is Rsc1 and Rsc2, and current measuring element would generally be arranged and detected object string
Connection, if connecting the electric current for extracting and flowing through d.c. motor with d.c. motor using low resistance, when load current is bigger, in electric current inspection
The pressure drop at measuring resistance both ends can also become larger, and according to Kirchhoff's second law, certainly will will cause and actually be added in d.c. motor both ends
Voltage reduce, reduce the revolving speed of d.c. motor.So worked normally to not influence main circuit d.c. motor as far as possible, so
The current sense resistor resistance value for flowing through d.c. motor is all very little.
The utility model penetrates-base voltage using the voltage drop at current sense resistor both ends as triode Q1 and Q2,
The voltage drop at current sense resistor both ends controls whether triode Q1 and Q2 are connected.When the operating current of d.c. motor is excessive,
So that the voltage drop that detection resistance is the both ends Rsc1 and Rsc2 penetrates-base voltage greater than Q1 and Q2, and make triode Q1 and Q2
Conducting.When triode Q1 and Q2 are connected, the node voltage of its collector terminal be its emitter voltage subtract saturation region penetrate-base stage
Between voltage drop, idealization can be considered zero, so at this time the voltage of Q1 and Q2 collector endpoint be almost+VP.
Because must be when vehicle body supplies opposed polarity supply voltage to DC motor controlling circuit, the over-current signal of generation
Output can only be unique, for " overcurrent " signal OC1 and OC2 due to Q1 or Q2 conducting in the output of its collector, takes two two
Pole pipe D5 and D6 and resistance R6 collectively constitutes easy "or" logical relation operation.Two over-current signal meetings by inclusive-OR operation
Connect PC817 photo-coupler primary side, though vehicle body outside add to protection circuit polarity of voltage why, once d.c. motor work
There is overcurrent, photo-coupler movement and the phototriode work of secondary side and enter saturation, so emitter-base bandgap grading end-point voltage is several
It is equal to+VP, because voltage is directly coupled to the disposition input terminal of self-hold circuit or the base stage of triode Q5 thus, if this is electric
Pressure is greater than the emitter voltage of Q5, and triode Q5 will enter cut-off region, and in other words, self-hold circuit is reset as being failure to actuate just
Beginning state.A diode D10 is connected in series in the emitter-base bandgap grading of the triode of self-hold circuit, since+VP voltage passes through one
After the VEB pressure drop of the Zener diode, diode D10 and Q5 of 2.2V, it more can determine that the emitter-base bandgap grading of photo-coupler secondary side can be
Output after when d.c. motor overcurrent is greater than the voltage higher than Q5 emitter-base bandgap grading, and more determining self-hold circuit can be reset as " initial shape
State ".
Further, the driving circuit includes the first driving circuit and the second driving circuit；
First driving circuit includes the 4th input terminal, the 7th resistance R7, the 8th resistance R8, the 14th resistance R14, the
The driving of eight triode Q8 and first end；
The third output end is connect with the 4th input terminal, one end connection of the 4th input terminal and R14；It is described
The connection of one end of first control terminal and R7, the other end of the R7 are connect with the collector of one end of R8 and Q8 respectively, the R8
The other end with first driving end connect；The base stage of the Q8 and the other end of R14 connect, the emitter ground connection of the Q8；
First driving circuit include the 5th input terminal, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11,
The driving of 9th triode Q9 and second end；
The third output end is connect with the 5th input terminal, one end connection of the 5th input terminal and R9；It is described
The connection of one end of first control terminal and R10, the other end of the R10 are connect with the collector of one end of R11 and Q9 respectively, institute
The other end for stating R11 is connect with the second driving end；The base stage of the Q9 and the other end of R19 connect, and the emitter of the Q9 connects
Ground；
The Q8 and Q9 is NPN type triode.
As can be seen from the above description, being born when triode Q3 and Q4 control vehicle body power supply different voltages polarity to rearview mirror respectively
" transistor " for blaming d.c. motor power supply in ON/OFF rearview mirror, is all PNP type triode, to it is connected, it is necessary to
Penetrate at it-base stage between produce greater than 0.7V voltage drop.
Self-hold circuit exports Vct signal, by triode Q8 and Q9 reverse phase, is responsible for driving triode Q3 and Q4, when certainly
It is high voltage that holding circuit, which exports Vct, and meeting driving triode Q8 and the Q9 work of this signal is in saturation region.When Vct be high voltage, three
The collector voltage-to-ground of pole pipe Q8 and Q9 are almost ground potential, and triode Q3 and Q4 can penetrate because of it-and base voltage is greater than 0.7V
And begin to turn on, it is noted that must be in base stage and current-limiting resistance of connecting between collector between Q8 and Q9 of Q3 and Q4.
Because triode is a kind of current controling element, the output electric current of element depends mainly on the electricity of cell input
Stream, here, the input terminal electric current of controller circuitry triode, exactly flows through the base stage and triode Q8 and Q9 of triode Q3 and Q4
Between concatenated current-limiting resistance electric current between collector, therefore can pass through a little resistance value sizes of change, and quota constant current crosses three
The collector current of pole pipe Q3 and Q4 or the size of current of d.c. motor.Certain is needed to normally working controlled d.c. motor
The operating current of one value class size, theoretically, controller circuitry should design transistor base according to this current values
The resistance value of current-limiting resistance between driving circuit transistor collector.
The verifying of overcurrent circuit function:
Assuming that the current detecting unit Rsc of the current foldback circuit of DC motor controller is served as using 1 Ω resistance, originally
D.c. motor change with 5.1 Ω resistance substitution, facilitate control load current size, load control triode be then with positive-negative-positive three
Pole pipe is served as, and the base stage of triode concatenates a 2K Ω resistance.When controller circuitry it is additional+12V DC power supply, in non-loaded feelings
Under condition, self-hold circuit can normally start.
If 5.1 Ω load resistances are added controller circuitry and temporarily serve as load role, load current detection resistance Rsc
Current foldback circuit will be acted due to being more than the reference current of setting because flowing through, because Rsc resistance value is 1 Ω, so Rsc resistance two
The voltage drop at end is to flow through its size of current.When+the 12V one for adding to controller outside is added, managing circuit certainly can be normal
Starting, but 5.1 Ω moment of load resistance is added, and circuit because is that load occurs overcurrent and is reset self-hold circuit moment.Cause
A 2K Ω resistance is concatenated for the base stage of triode, can effectively limit the base current of power crystal in 5.65mA or so, again
The DC current gain (hfe) of the triode of selection is assumed to be 150, then the maximum collector current for flowing through triode is about
847.5mA, by upper, current detecting unit Rsc is served as using 1 Ω resistance, and observation oscilloscope measurement obtains flowing through the current wave of Rsc
Shape maximum value is about 890mA, this electric current can cause voltage drop at the both ends Rsc, it will be apparent that this voltage drop alreadyd exceed
The VEB value of triode Q1 and Q2 in stream protection circuit, triode Q1 conducting, overcurrent protection motion mechanism are activated.If not examining
The base current for considering triode is limited, and loads 5.1 Ω resistance, the electric current of max-flow overload should be in 2.35A or so, still
The load current waveform as measured by oscillograph, which is shown, actually loads load current caused by 5.1 Ω resistance not as pre-
Phase reaches 2A or more, indicates that the emitter-base bandgap grading for demonstrating triode or collector current are controllable by base current value.Triode
The base resistance of concatenation is 2K Ω resistance, then the maximum collector current of triode should be 847.5mA, if using triode
(rated operational current 1A) can meet the demand for control on control para-electric road, also in normal DC motor operations current range
It is interior, but over-current detection circuit starts, indicate that current sense resistor is also too big using 1 Ω resistance, it is necessary to reduce.
Please refer to Fig. 1 to Fig. 7, the embodiments of the present invention one are as follows:
The utility model provides a kind of control device that driving automobile rearview mirror pedestal folds, including power supply 1, voltage pole
Property conversion circuit 2, the first current foldback circuit 3, the second current foldback circuit 4, logical-arithmetic unit 5, self-hold circuit, driving
The motor 10 that circuit 7, the first power transistor 8, the second power transistor 9 and driving rearview mirror pedestal fold；
1 anode of power supply is connect with the first input end of polarity of voltage conversion circuit 2,1 cathode of power supply and voltage
Second input terminal of polarity switching 2 connects；
First output end of the polarity of voltage conversion circuit 2 is connect with one end of the first current foldback circuit 3, and described
The other end of one current foldback circuit 3 is connect with one end of the first power transistor 8, first power transistor 8 it is another
End is connect with one end of motor 10；
The second output terminal of the polarity of voltage conversion circuit 2 is connect with one end of the second current foldback circuit 4, and described
The other end of two current foldback circuits 4 is connect with one end of the second power transistor 9, first power transistor 8 it is another
End is connect with the other end of motor 10；
First current foldback circuit 3 and the second current foldback circuit 4 pass through logical-arithmetic unit 5 and self-sustaining electricity respectively
Road connection；
The self-hold circuit is connect with the polarity of voltage conversion circuit 2 and the driving circuit 7 respectively, the driving
Circuit 7 is connect with the first power transistor 8 and the second power transistor 9 respectively.
The embodiments of the present invention two are as follows:
The embodiments of the present invention two and the difference of embodiment one are, further include optically coupled circuit 11, the seven or two pole
Pipe D7 and the 8th diode D8；
The polarity of voltage conversion circuit 2 include first input end, the second input terminal, the first output end, second output terminal,
First ground terminal, the first control terminal, first diode D1, the second diode D2, third diode D3 and the 4th diode D4；
The anode of the power supply 1 is connect with first input end, and the cathode of the power supply 1 is connect with the second input terminal；It is described
First input end is connect with the anode of the cathode of D1 and D3 respectively；The anode of the D3 is connect with the first output end；
The anode of the D1 is connect with the anode of the first ground terminal and D2 respectively, and the cathode of the D2 and the second input terminal connect
It connects；
The cathode of the D3 is connect with the cathode of the first control terminal and D4 respectively, and the anode of the D4 is inputted with second respectively
End is connected with second output terminal；First control terminal and the first ground terminal are connect with self-hold circuit respectively；
First current foldback circuit 3 includes the first over-current detection resistance Rcs1, the first triode Q1 and the seven or two pole
Pipe D5；
First output end is connect with one end of the emitter of Q1 and Rcs1 respectively, the other end of the Rcs1 respectively with
The base stage of Q1 is connected with one end of the first power transistor 8, and the collector of the Q1 and the anode of D5 connect, and the D5's is negative
Pole is connect with logical-arithmetic unit 5；
Second current foldback circuit 4 includes the second over-current detection resistance Rcs2, the second triode Q2 and the eight or two pole
Pipe D6；
The second output terminal is connect with one end of the emitter of Q2 and Rcs1 respectively, the other end of the Rcs2 respectively with
The base stage of Q1 is connected with one end of the first power transistor 8, and the collector of the Q2 and the anode of D6 connect, and the D6's is negative
Pole is connect with logical-arithmetic unit 5；The Q1 and Q2 is PNP type triode；
The optically coupled circuit 11 includes phototriode Q7；The connection of the collector of first control terminal and Q7, it is described
The emitter of Q7 and the resetting end of self-hold circuit connect；The Q7 is NPN type phototriode；
The logical-arithmetic unit 5 includes the 6th resistance R6 and light emitting diode D11；
The cathode of the cathode of the D5 and the D6 are connect with the anode of D11 respectively, the cathode ground connection of the D11；
First output end of the polarity of voltage conversion circuit 2 is connect with the anode of the D7, the cathode of the D7 and institute
State the other end connection of the first power transistor 8；The second output terminal of the polarity of voltage conversion circuit 2 and the cathode of the D8
The anode of connection, the D8 is connect with the other end of second power transistor 9.
First power transistor 8 is third transistor Q3, the 4th triode Q4 of the second power transistor 9；Institute
It states Q3 and Q4 is PNP type triode, the emitter of the Q3 and the other end of Rcs1 connect, the base stage and driving electricity of the Q3
The first driving end connection on road 7, the collector of the Q3 are connect with one end of motor 10；The emitter of the Q4 and Rcs2's is another
One end connection, the base stage of the Q4 drive end to connect with the second of driving circuit 7, and the collector of the Q4 is another with motor 10
End connection；
The self-hold circuit includes third input terminal, third output end, resetting end, zener diode D9, the 9th 2 pole
Pipe D10, the 5th triode Q5, the 6th triode Q6, first capacitor C3, first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4, the 5th resistance R5, twelfth resistor R12, thirteenth resistor R13 and the second ground terminal；
The third input terminal is connect with the first control terminal, and the anode of the third input terminal and D9 connect, the D9's
Cathode is connect with one end of one end of R12, one end of C3, the anode of D10 and R4 respectively；The transmitting of the cathode and Q5 of the D10
Pole connection, the base stage of the Q5 are connect with the other end of R4, one end of R5 and resetting end respectively, the resetting end and photosensitive three
The emitter of pole pipe connects；The collector of the Q5 is connect with one end of third output end, R2 respectively；
The other end of the R12 is connect with one end of one end of R13, the other end of C3 and R1 respectively；The R1's is another
End is connect with the base stage of the other end of R2, one end of R3 and Q6 respectively；The collector of the Q6 and the other end of R5 connect, described
The emitter of Q6 is connect with the other end of R13, the other end of R3 and the second ground terminal respectively；Second ground terminal connects with first
It is grounded after ground terminal connection；The third output end is connect with driving circuit 7；
The Q5 is PNP type triode, and the Q6 is NPN type triode；
The driving circuit 7 includes the first driving circuit and the second driving circuit；
First driving circuit includes the 4th input terminal, the 7th resistance R7, the 8th resistance R8, the 14th resistance R14, the
The driving of eight triode Q8 and first end；
The third output end is connect with the 4th input terminal, one end connection of the 4th input terminal and R14；It is described
The connection of one end of first control terminal and R7, the other end of the R7 are connect with the collector of one end of R8 and Q8 respectively, the R8
The other end with first driving end connect；The base stage of the Q8 and the other end of R14 connect, the emitter ground connection of the Q8；
First driving circuit include the 5th input terminal, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11,
The driving of 9th triode Q9 and second end；
The third output end is connect with the 5th input terminal, one end connection of the 5th input terminal and R9；It is described
The connection of one end of first control terminal and R10, the other end of the R10 are connect with the collector of one end of R11 and Q9 respectively, institute
The other end for stating R11 is connect with the second driving end；The base stage of the Q9 and the other end of R19 connect, and the emitter of the Q9 connects
Ground；The Q8 and Q9 is NPN type triode.
In conclusion the utility model provides a kind of control device that driving automobile rearview mirror pedestal folds, by setting
The polarity of voltage conversion circuit of meter can satisfy the function that eliminating automobile external back mirrow pedestal is upheld and is folded inward outward；Lead to simultaneously
Cross the first current foldback circuit, the second current foldback circuit is connect with logical-arithmetic unit respectively, logical-arithmetic unit realization or fortune
Function is calculated, and the resetting end of logical-arithmetic unit and self-hold circuit connects, and can play the role of overcurrent protection to control circuit；
The self-hold circuit of the utility model distinguishes the first power transistor by driving circuit and the second power transistor connects, and realizes
The conducting of motor circuit, being capable of intelligently drive motor；The utility model by above structure provide a kind of structure it is simple, at
The control circuit that this lower driving automobile rearview mirror pedestal folds.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalents made based on the specification and figures of the utility model are applied directly or indirectly in other relevant technologies
Field is also included in the patent protection scope of the utility model.
Claims (4)
1. a kind of control device that driving automobile rearview mirror pedestal folds, which is characterized in that including power supply, polarity of voltage conversion electricity
Road, the first current foldback circuit, the second current foldback circuit, logical-arithmetic unit, self-hold circuit, driving circuit, the first power
Motor, the optically coupled circuit, the 7th diode D7 and the 8th that transistor, the second power transistor, driving rearview mirror pedestal fold
Diode D8；
The anode of the power supply is connect with the first input end of polarity of voltage conversion circuit, the cathode and polarity of voltage of the power supply
Second input terminal of conversion circuit connects；
First output end of the polarity of voltage conversion circuit is connect with one end of the first current foldback circuit, first overcurrent
The other end of protection circuit is connect with one end of the first power transistor, the other end of first power transistor and motor
One end connection；
The second output terminal of the polarity of voltage conversion circuit is connect with one end of the second current foldback circuit, second overcurrent
The other end of protection circuit is connect with one end of the second power transistor, the other end of first power transistor and motor
Other end connection；
First current foldback circuit and the second current foldback circuit pass through logical-arithmetic unit respectively and connect with self-hold circuit；
The self-hold circuit is connect with the polarity of voltage conversion circuit and the driving circuit respectively, the driving circuit point
It is not connect with the first power transistor and the second power transistor；
The polarity of voltage conversion circuit include the first ground terminal, the first control terminal, first diode D1, the second diode D2,
Third diode D3 and the 4th diode D4；
The first input end is connect with the anode of the cathode of D1 and D3 respectively；The anode of the D3 is connect with the first output end；
The anode of the D1 is connect with the anode of the first ground terminal and D2 respectively, and the cathode of the D2 is connect with the second input terminal；
The cathode of the D3 is connect with the cathode of the first control terminal and D4 respectively, the D4 anode respectively with the second input terminal and
Second output terminal connection；First control terminal and the first ground terminal are connect with self-hold circuit respectively；
First current foldback circuit includes the first over-current detection resistance Rcs1, the first triode Q1 and the 7th diode D5；
First output end is connect with one end of the emitter of Q1 and Rcs1 respectively, and the other end of the Rcs1 is respectively with Q1's
Base stage is connected with one end of the first power transistor, and the anode of the collector of the Q1 and D5 connect, the cathode of the D5 with patrol
Collect arithmetic unit connection；
Second current foldback circuit includes the second over-current detection resistance Rcs2, the second triode Q2 and the 8th diode D6；
The second output terminal is connect with one end of the emitter of Q2 and Rcs1 respectively, and the other end of the Rcs2 is respectively with Q1's
Base stage is connected with one end of the first power transistor, and the anode of the collector of the Q2 and D6 connect, the cathode of the D6 with patrol
Collect arithmetic unit connection；The Q1 and Q2 is PNP type triode；
The optically coupled circuit includes phototriode Q7；The connection of the collector of first control terminal and Q7, the hair of the Q7
The connection of the resetting end of emitter-base bandgap grading and self-hold circuit；The Q7 is NPN type phototriode；
The logical-arithmetic unit includes the 6th resistance R6 and light emitting diode D11；
The cathode of the cathode of the D5 and the D6 are connect with the anode of D11 respectively, the cathode ground connection of the D11；
First output end of the polarity of voltage conversion circuit is connect with the anode of the D7, the cathode of the D7 and described first
The other end of power transistor connects；
The second output terminal of the polarity of voltage conversion circuit is connect with the cathode of the D8, the anode and described second of the D8
The other end of power transistor connects.
2. a kind of control device that driving automobile rearview mirror pedestal folds according to claim 1, which is characterized in that described
First power transistor is third transistor Q3, the 4th triode Q4 of the second power transistor；
The Q3 and Q4 is PNP type triode, and the other end of the emitter of the Q3 and Rcs1 connect, the base stage of the Q3 with
First driving end connection of driving circuit, the collector of the Q3 and one end of motor connect；
The emitter of the Q4 and the other end of Rcs2 connect, the base stage of the Q4 and the second driving end connection of driving circuit,
The collector of the Q4 and the other end of motor connect.
3. according to claim 1 it is a kind of driving automobile rearview mirror pedestal fold control device, which is characterized in that it is described from
Holding circuit includes third input terminal, third output end, resetting end, zener diode D9, the 9th diode D10, the five or three pole
Pipe Q5, the 6th triode Q6, first capacitor C3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th
Resistance R5, twelfth resistor R12, thirteenth resistor R13 and the second ground terminal；
The third input terminal is connect with the first control terminal, and the anode of the third input terminal and D9 connect, the cathode of the D9
It is connect respectively with one end of one end of R12, one end of C3, the anode of D10 and R4；The cathode of the D10 and the emitter of Q5 connect
It connects, the base stage of the Q5 connect with the other end of R4, one end of R5 and resetting end respectively, end and the phototriode of resetting
Emitter connection；The collector of the Q5 is connect with one end of third output end, R2 respectively；
The other end of the R12 is connect with one end of one end of R13, the other end of C3 and R1 respectively；The other end of the R1 point
It is not connect with the base stage of the other end of R2, one end of R3 and Q6；The collector of the Q6 and the other end of R5 connect, the Q6's
Emitter is connect with the other end of R13, the other end of R3 and the second ground terminal respectively；Second ground terminal and the first ground terminal
It is grounded after connection；The third output end is connect with driving circuit；
The Q5 is PNP type triode, and the Q6 is NPN type triode.
4. a kind of control device that driving automobile rearview mirror pedestal folds according to claim 3, which is characterized in that the drive
Dynamic circuit includes the first driving circuit and the second driving circuit；
First driving circuit includes the 4th input terminal, the 7th resistance R7, the 8th resistance R8, the 14th resistance R14, the eight or three
The driving of pole pipe Q8 and first end；
The third output end is connect with the 4th input terminal, one end connection of the 4th input terminal and R14；Described first
The connection of one end of control terminal and R7, the other end of the R7 are connect with the collector of one end of R8 and Q8 respectively, and the R8's is another
One end is connect with the first driving end；The base stage of the Q8 and the other end of R14 connect, the emitter ground connection of the Q8；
First driving circuit includes the 5th input terminal, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the 9th
The driving of triode Q9 and second end；
The third output end is connect with the 5th input terminal, one end connection of the 5th input terminal and R9；Described first
The connection of one end of control terminal and R10, the other end of the R10 are connect with the collector of one end of R11 and Q9 respectively, the R11
The other end with second driving end connect；The base stage of the Q9 and the other end of R19 connect, the emitter ground connection of the Q9；
The Q8 and Q9 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920039437.4U CN209683561U (en) | 2019-01-10 | 2019-01-10 | A kind of control device that driving automobile rearview mirror pedestal folds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920039437.4U CN209683561U (en) | 2019-01-10 | 2019-01-10 | A kind of control device that driving automobile rearview mirror pedestal folds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209683561U true CN209683561U (en) | 2019-11-26 |
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ID=68598469
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920039437.4U Expired - Fee Related CN209683561U (en) | 2019-01-10 | 2019-01-10 | A kind of control device that driving automobile rearview mirror pedestal folds |
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| Country | Link |
|---|---|
| CN (1) | CN209683561U (en) |
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2019
- 2019-01-10 CN CN201920039437.4U patent/CN209683561U/en not_active Expired - Fee Related
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Granted publication date: 20191126 Termination date: 20210110 |