CN212908989U - Protection circuit for preventing rearview mirror switch from adjusting failure - Google Patents
Protection circuit for preventing rearview mirror switch from adjusting failure Download PDFInfo
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- CN212908989U CN212908989U CN202021268107.1U CN202021268107U CN212908989U CN 212908989 U CN212908989 U CN 212908989U CN 202021268107 U CN202021268107 U CN 202021268107U CN 212908989 U CN212908989 U CN 212908989U
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- rearview mirror
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- mirror switch
- adjusting motor
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Abstract
The utility model discloses a protection circuit for preventing the adjustment failure of a rearview mirror switch, which comprises a rearview mirror switch array, a rearview mirror adjusting motor and a PTC element; the first end of the rearview mirror switch array is connected with the positive electrode of the power supply; the second end of the rearview mirror switch array is connected with the first end of the PTC element; the second end of the PTC element is connected with the negative pole of the power supply; the output end of the rearview mirror switch array is connected with the signal receiving end of the rearview mirror adjusting motor. The utility model provides a prevent protection circuit of rear-view mirror switch regulation inefficacy, the short circuit return circuit can not gone into to the PTC component, avoids its risk of being burnt out.
Description
Technical Field
The utility model relates to an automotive circuit field especially relates to a prevent protection circuit of rear-view mirror on-off regulation inefficacy.
Background
In order to facilitate a driver to know the side and rear conditions of an automobile in time in the driving process of the automobile, the existing automobile is provided with a rearview mirror. In order to meet the requirements of different drivers, the automobile rearview mirror can be adjusted in left, right, up and down directions and the like. In the existing rearview mirror switch structure design, two key contacts are occasionally conducted simultaneously to cause internal short circuit in the adjusting operation process, and a circuit fuse is burnt; in addition, because of the influence of the width of the circuit fuse of the PCB, sometimes the contact is burnt to break the fuse without burning, and the permanent failure of the switch can be caused by the burning of the circuit fuse or the burning of the contact. In order to solve such a problem, a conventional solution is to add a PTC (recoverable fuse) to the circuit. When the circuit is short-circuited, the switch can be protected from being burnt.
However, in the typical application example of the conventional PTC, the PTC is connected to the positive pole of the power supply, and when the switching load is abnormally short-circuited, the PTC may be connected in a short-circuit loop, so that there is a risk of burning, as shown in fig. 1.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevent protection circuit that rear-view mirror switch regulation became invalid, the PTC component can not cluster into short circuit return circuit, avoids its risk of being burnt out.
In order to achieve the above object, the present invention provides a protection circuit for preventing adjustment failure of a rearview mirror switch, which comprises a rearview mirror switch array, a rearview mirror adjusting motor and a PTC element; the first end of the rearview mirror switch array is connected with the positive electrode of the power supply; the second end of the rearview mirror switch array is connected with the first end of the PTC element; the second end of the PTC element is connected with the negative pole of the power supply; the output end of the rearview mirror switch array is connected with the signal receiving end of the rearview mirror adjusting motor.
As a further improvement of the utility model, the rearview mirror adjusting motor comprises a left adjusting motor and a right adjusting motor; the left adjusting motor comprises a left up-down adjusting motor and a left-right adjusting motor; the right side adjusting motor comprises a right side up-down adjusting motor and a right side left-right adjusting motor; the rearview mirror switch array comprises a left/right change-over switch LR SW which is correspondingly connected with the signal receiving ends of the left adjusting motor and the right adjusting motor.
As a further improvement of the present invention, the rearview mirror switch array includes an UP switch SW1, a first end of SW1 is connected to the positive power supply, and a second end of SW1 is connected to a first end of a left/right switch LR SW.
As a further improvement of the present invention, the mirror switch array includes a DOWN switch SW4, a first end of SW4 is connected to a first end of the left/right switch LR SW, and a second end of SW4 is connected to a first end of the PTC element.
As a further improvement of the present invention, the rear view mirror switch array includes a LEFT switch SW3, a first end of SW3 is connected to the positive power supply, and a second end of SW3 is connected to a second end of the LEFT/right switch LR SW.
As a further improvement of the present invention, the rear view mirror switch array includes a RIGHT switch SW6, a first end of SW6 is connected to a second end of the left/RIGHT switch LR SW, and a second end of SW6 is connected to a first end of the PTC element.
As a further improvement of the present invention, said rearview mirror switch array includes a RIGHT/DOWN switch SW5 and a LEFT/UP switch SW 2; the first end of the SW5 is connected with the positive electrode of the power supply, the second end of the SW5 is connected with the first end of the SW2, and the second end of the SW2 is connected with the first end of the PTC element.
Advantageous effects
Compared with the prior art, the utility model discloses a prevent that protection circuit of rear-view mirror on-off regulation inefficacy's advantage does: the PTC element is connected to the negative pole of the power supply. When an internal abnormal short circuit occurs, the PTC element can reduce the peak value of the short circuit current, increase the line resistance to block the large current and protect the internal circuit of the switch. When the short circuit is recovered to normal, the circuit can recover the function in a short time, so that the protection switch cannot be burnt and the normal use of the switch is not influenced. In addition, when abnormal short circuit occurs between the load of the rearview mirror switch and other ground wires, the PTC element cannot be connected into the short circuit loop in series, the risk of burning the PTC element when the load is abnormally short-circuited can be avoided, the stability and the durability of the protection circuit are greatly improved, and a more ideal protection effect is achieved.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a short-circuit current in a conventional switch protection circuit for a rearview mirror;
fig. 2 is a schematic diagram of a protection circuit for preventing adjustment failure of a rearview mirror switch of the present invention;
fig. 3 is a schematic diagram of a short-circuit current when the short circuit occurs in the protection circuit of the present invention.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings.
Examples
The utility model discloses a particular embodiment is as shown in fig. 2 and fig. 3, a protection circuit for preventing rear-view mirror switch from adjusting inefficacy, including rear-view mirror switch array, rear-view mirror accommodate motor, still include the PTC component. The first end of the rearview mirror switch array is connected with the positive pole of the power supply. The second end of the rearview switch array is connected with the first end of the PTC element. The second end of the PTC element is connected with the negative pole of the power supply. The output end of the rearview mirror switch array is connected with the signal receiving end of the rearview mirror adjusting motor. The protection circuit is arranged on the vehicle body, and loads such as a rearview mirror adjusting motor are grounded.
The rearview mirror adjusting motor comprises a left adjusting motor and a right adjusting motor. The left side regulating motor comprises a left side up-and-down regulating motor and a left side left-and-right regulating motor. The right side adjusting motor comprises a right side up-and-down adjusting motor and a right side left-and-right adjusting motor. Wherein, the signal receiving end of the left up-down adjusting motor is L/MA; the signal receiving end of the left and right adjusting motor is L/MB; the signal receiving end of the motor is adjusted to be R/MA vertically on the right side; the signal receiving end of the right left adjusting motor is R/MB. The rearview mirror switch array comprises a left/right change-over switch LR SW which is correspondingly connected with the signal receiving ends of the left adjusting motor and the right adjusting motor.
The rearview mirror switch array includes an UP switch SW 1. A first terminal of the UP switch SW1 is connected to the positive power supply, and a second terminal of the SW1 is connected to a first terminal of the left/right switch LR SW.
The mirror switch array includes a DOWN switch SW 4. A first terminal of the DOWN switch SW4 is connected to a first terminal of the left/right switch LR SW, and a second terminal of the SW4 is connected to a first terminal of the PTC element.
The rearview mirror switch array includes LEFT switch SW 3. A first terminal of LEFT switch SW3 is connected to the positive power supply, and a second terminal of SW3 is connected to a second terminal of LEFT/right switch LR SW.
The rearview mirror switch array includes a RIGHT switch SW 6. A first terminal of the RIGHT switch SW6 is connected to a second terminal of the left/RIGHT switch LR SW, and a second terminal of the SW6 is connected to a first terminal of the PTC element.
The mirror switch array includes a RIGHT/DOWN switch SW5 and a LEFT/UP switch SW 2. The first terminal of SW5 is connected to the positive terminal of the power supply, the second terminal of SW5 is connected to the first terminal of SW2, and the second terminal of SW2 is connected to the first terminal of the PTC element.
As shown in fig. 3, when the load (i.e. the mirror adjusting motor) is abnormally short-circuited, the PTC element is not connected in series to the short-circuit loop, so that the internal circuit of the switch is protected by reducing the peak value of the short-circuit current and increasing the line resistance to block a large current, and the risk of burning the PTC element when the load is abnormally short-circuited is avoided. The stability and the durability of the protection circuit are greatly improved, and a more ideal protection effect is achieved.
The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to the above-disclosed embodiments, and various modifications, equivalent combinations, which are made according to the essence of the present invention, should be covered.
Claims (7)
1. A protection circuit for preventing the regulation failure of a rearview mirror switch comprises a rearview mirror switch array and a rearview mirror regulation motor, and is characterized by also comprising a PTC element; the first end of the rearview mirror switch array is connected with the positive electrode of the power supply; the second end of the rearview mirror switch array is connected with the first end of the PTC element; the second end of the PTC element is connected with the negative pole of the power supply; the output end of the rearview mirror switch array is connected with the signal receiving end of the rearview mirror adjusting motor.
2. A protection circuit against failure of the adjustment of the mirror switch according to claim 1, characterized in that said mirror adjustment motor comprises a left adjustment motor and a right adjustment motor; the left adjusting motor comprises a left up-down adjusting motor and a left-right adjusting motor; the right side adjusting motor comprises a right side up-down adjusting motor and a right side left-right adjusting motor; the rearview mirror switch array comprises a left/right change-over switch LR SW which is correspondingly connected with the signal receiving ends of the left adjusting motor and the right adjusting motor.
3. The protection circuit of claim 2, wherein the rearview mirror switch array comprises an UP switch SW1, a first terminal of SW1 connected to the positive power supply, and a second terminal of SW1 connected to a first terminal of a left/right switch LR SW.
4. A protection circuit against regulation failure of a rear view mirror switch according to claim 3, characterized in that said rear view mirror switch array comprises a DOWN switch SW4, a first terminal of SW4 being connected to a first terminal of said left/right switch LR SW, and a second terminal of SW4 being connected to a first terminal of said PTC element.
5. A protection circuit against regulation failure of a rear view mirror switch according to claim 3, characterized in that said rear view mirror switch array comprises LEFT switch SW3, a first terminal of SW3 being connected to the positive supply and a second terminal of SW3 being connected to a second terminal of said LEFT/right changeover switch LR SW.
6. A protection circuit against regulation failure of a rear view mirror switch according to claim 5, characterized in that said rear view mirror switch array comprises a RIGHT switch SW6, a first terminal of SW6 being connected to a second terminal of said left/RIGHT switch LR SW, a second terminal of SW6 being connected to a first terminal of said PTC element.
7. A protection circuit against regulation failure of a rear view mirror switch according to claim 6, characterized in that said rear view mirror switch array comprises a RIGHT/DOWN switch SW5 and a LEFT/UP switch SW 2; the first end of the SW5 is connected with the positive electrode of the power supply, the second end of the SW5 is connected with the first end of the SW2, and the second end of the SW2 is connected with the first end of the PTC element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021268107.1U CN212908989U (en) | 2020-07-01 | 2020-07-01 | Protection circuit for preventing rearview mirror switch from adjusting failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021268107.1U CN212908989U (en) | 2020-07-01 | 2020-07-01 | Protection circuit for preventing rearview mirror switch from adjusting failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212908989U true CN212908989U (en) | 2021-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021268107.1U Active CN212908989U (en) | 2020-07-01 | 2020-07-01 | Protection circuit for preventing rearview mirror switch from adjusting failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212908989U (en) |
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2020
- 2020-07-01 CN CN202021268107.1U patent/CN212908989U/en active Active
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