Rearview mirror adjusting circuit and automobile rearview mirror

Abstract

The utility model relates to the technical field of automobiles, in particular to a rearview mirror adjusting circuit and an automobile rearview mirror. The circuit comprises a driving switch module, a linkage protection module and a motor driving module, a direction switch in the driving switch module is correspondingly closed according to the key pressing action of a user and provides a driving signal to the motor driving module when the direction switch is closed, and the linkage protection module can drive the motor driving module when the driving signal is not unique. And the driving signal generated by the direction switch which is not completely closed is blocked, so that the motor driving module drives the motor according to the proper driving signal to adjust the rearview mirror. According to the circuit, key linkage protection is completed through a simple circuit structure, the cost is low, good use experience is provided for a user, debugging is convenient, the requirement for key related structure precision is lowered on the basis, product production is convenient, and the application range is wide.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a rearview mirror adjustment circuit and an automobile rearview mirror. Background Art

[0002] The rearview mirror is a tool for the driver to directly obtain external information such as the rear, side and bottom of the car while sitting in the driver's seat. In order to facilitate the driver's operation, prevent traffic accidents and ensure personal safety, all countries have stipulated that rearview mirrors must be installed on cars, and all rearview mirrors must be able to adjust the direction. If the user presses the button randomly when using it, or the sensitivity of the button structure is not appropriate, the button linkage phenomenon will affect the user's operating experience. Utility Model Content

[0003] The implementation method of the present application mainly solves the technical problem that the existing rearview mirror adjustment method cannot solve the button linkage problem.

[0004] In order to solve the above technical problems, a technical solution adopted by the embodiment of the present application is: providing a rearview mirror adjustment circuit, including a driving switch module, a linkage protection module and a motor driving module, wherein the linkage protection module is respectively connected to the driving switch module and the motor driving module, and the motor driving module is also connected to a motor;

[0005] The driving switch module includes four groups of directional switches, each group of the directional switches includes a first switch and a second switch, the directional switches are used to respond to a key action of a user, turn on according to the key action, and provide a driving signal to the motor driving module when turned on, wherein the key action is a key action of the user to adjust the direction of the rearview mirror, and each direction key action corresponds to a driving signal;

[0006] The linkage protection module is used to block the driving signal generated by the direction switch that is not fully turned on when the driving signal is not unique, wherein the direction switch that is not fully turned on means that only one of the direction switches is turned on;

[0007] The motor driving module is used to drive the motor according to the driving signal to adjust the rearview mirror.

[0008] In some embodiments, the linkage protection module includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a resistor R2, a resistor R3 and a diode D3;

[0009] The first end of the switch tube Q2 is grounded through the first switch in the first group of directional switches, the second end of the switch tube Q2 is connected to the cathode of the diode D3, and the control end of the switch tube Q2 is connected to the power supply through the resistor R2;

[0010] The first end of the switch tube Q1 is grounded through the second switch in the fourth group of directional switches, the second end of the switch tube Q1 is connected to the cathode of the diode D3, and the control end of the switch tube Q1 is connected to the power supply through the resistor R2;

[0011] The first end of the switch tube Q3 is connected to the power supply through the resistor R2, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the anode of the diode D3 through the resistor R3;

[0012] The anode of the diode D3 is connected to the power supply through the second switch in the second group of directional switches and the second switch in the third group of directional switches, and the cathode of the diode D3 is connected to the motor driving module.

[0013] In some embodiments, the switch tube Q1 and the switch tube Q2 are both NMOS tubes.

[0014] In some embodiments, the switch tube Q3 is an NPN transistor.

[0015] In some embodiments, the drive switch module further includes a rearview mirror selection switch, the rearview mirror selection switch is a double-pole double-throw switch, and the rearview mirror selection switch responds to the user's rearview mirror selection action;

[0016] The four static contacts of the rearview mirror selection switch are respectively connected to the four driving pins of the motor drive module, the first moving contact of the rearview mirror selection switch is connected to the power supply through the second switch in the first group of directional switches, the first moving contact of the rearview mirror selection switch is also grounded through the first switch in the second group of directional switches, the second moving contact of the rearview mirror selection switch is connected to the power supply through the first switch in the fourth group of directional switches, and the second moving contact of the rearview mirror selection switch is also grounded through the first switch in the third group of directional switches.

[0017] In some embodiments, the first group of directional switches includes a first switch UP1 and a second switch UP2, the second group of directional switches includes a first switch DN1 and a second switch DN2, the third group of directional switches includes a first switch RH1 and a second switch RH2, and the fourth group of directional switches includes a first switch LH1 and a second switch LH2;

[0018] The first end of the first switch UP1, the first end of the first switch DN1, the first end of the first switch RH1, and the first end of the second switch LH2 are all grounded, the second end of the first switch UP1 is connected to the first end of the switch tube Q2, the second end of the first switch DN1 is connected to the first moving contact, the second end of the first switch RH1 is connected to the second moving contact, and the second end of the second switch LH2 is connected to the first end of the switch tube Q1;

[0019] A first end of the second switch UP2, a first end of the second switch DN2, a first end of the second switch RH2, and a first end of the first switch LH1 are all connected to a power supply, a second end of the second switch UP2 is connected to the first moving contact, a second end of the second switch DN2 and a second end of the second switch RH2 are both connected to the anode of the diode D3, and a second end of the first switch LH1 is connected to the second moving contact.

[0020] In some embodiments, the motor drive module includes a drive socket, which includes a drive pin MRH, a drive pin MLH, a drive pin MRV, a drive pin MLV and a main control pin MTR, the drive pin MRV is connected to the first static contact of the rearview mirror selection switch, the drive pin MLV is connected to the second static contact of the rearview mirror selection switch, the drive pin MRH is connected to the third static contact of the rearview mirror selection switch, the drive pin MLH is connected to the fourth static contact of the rearview mirror selection switch, and the main control pin MTR is connected to the cathode of the diode D3.

[0021] In some embodiments, the driving socket further includes a power supply pin B, and the power supply pin B is used to provide power.

[0022] In some embodiments, the motor driving module is also connected to a first motor and a second motor, the driving pin MRH and the driving pin MRV are both connected to the first end of the first motor, the driving pin MLH and the driving pin MLV are both connected to the first end of the second motor, and the second end of the first motor and the second end of the second motor are both connected to the main control pin MTR.

[0023] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present application is: to provide a car rearview mirror, including the rearview mirror adjustment circuit as described above.

[0024] Different from the related art, the embodiment of the present application provides a rearview mirror adjustment circuit and a car rearview mirror. The circuit includes a drive switch module, a linkage protection module and a motor drive module, wherein the direction switch in the drive switch module is closed according to the user's key action, and provides a drive signal to the motor drive module when closed, and the linkage protection module can block the drive signal generated by the incompletely closed direction switch when the drive signal is not unique, so that the motor drive module drives the motor according to the appropriate drive signal to adjust the rearview mirror. The circuit not only completes the key linkage protection with a simple circuit structure, the cost is low, and provides a good user experience for the user, but also is easy to debug. On this basis, the precision requirements of the key-related structure are reduced, which is convenient for product production and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1a It is a schematic diagram of a car rearview mirror;

[0026] Figure 1b yes Figure 1a Schematic diagram of the corresponding internal circuit board;

[0027] Figure 2 It is a PCB board schematic diagram of a rearview mirror control in the prior art;

[0028] Figure 3 is a schematic diagram of a rearview mirror adjustment circuit provided in an embodiment of the present application; DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "first", "second", etc. used in this specification are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0031] See also Figure 1a and Figure 1b As shown in the figure, the current car rearview mirror buttons are generally closely spaced. When users press the buttons casually, they are very likely to accidentally touch adjacent buttons. Figure 2 Zhongwei Figure 1b The corresponding PCB board schematic diagram, combined with Figure 2 From the above, under normal working conditions, if the user presses the left button, switches LH1 and LH2 are turned on. Similarly, switches RH1 and RH2 are turned on to the right, switches UP1 and UP2 are turned on to the upside, and switches DN1 and DN2 are turned on to the downside. If the user presses an adjacent button by mistake, a short circuit will occur, causing a fault, which may burn out the fuse or even damage the circuit.

[0032] For example, suppose the user accidentally presses the up button when wanting to adjust to the right, causing switches UP1, RH1, and RH2 to be turned on at the same time. The power supply terminal B+ will be connected to switch UP1 through switch RH2 and grounded, causing a short circuit between B+ and GND, which may cause the fuse to burn out or even burn out the circuit.

[0033] For another example, suppose the user accidentally presses the right button when trying to adjust downward, causing switches DN2, DN1, and LH2 to be turned on at the same time. The power supply terminal B+ will be connected to switch LH2 through switch DN2 and grounded, causing a short circuit between B+ and GND, which may also cause the fuse to burn out or even burn out the circuit.

[0034] Based on this, the embodiment of the present application provides a rearview mirror adjustment circuit to solve the above technical problems. The rearview mirror adjustment circuit includes a drive switch module, a linkage protection module and a motor drive module, the linkage protection module is respectively connected to the drive switch module and the motor drive module, and the motor drive module is also connected to a motor.

[0035] Among them, the driving switch module includes four groups of directional switches, each group of directional switches includes a first switch and a second switch, the directional switches are used to respond to the user's key action, turn on according to the key action, and provide a driving signal to the motor driving module when turned on, wherein the key action is a key action for the user to adjust the direction of the rearview mirror, and each direction key action corresponds to a driving signal.

[0036] It is understandable that the direction switch described in the embodiment of the present application can refer to Figure 2 In the switch form shown, the direction switch corresponding to each direction includes a first switch and a second switch. When the user presses a key in a certain direction, both switches in that direction are turned on.

[0037] The linkage protection module is used to block the driving signal generated by the incompletely turned-on directional switch when the driving signal is not unique, wherein the incompletely turned-on directional switch means that only one of the directional switches is turned on. It should be noted that the incompletely turned-on mentioned above refers to the phenomenon of key linkage caused by the user pressing a key in a certain direction due to the large contact surface of the fingertips, the deviation of the key position, or other misoperation reasons. For example, in the above example, the user wants to adjust to the right but accidentally causes the switches UP1, RH1 and RH2 to be turned on at the same time.

[0038] The motor drive module is used to drive the motor according to the drive signal to adjust the rearview mirror. Since the linkage protection module blocks the drive signal generated by the direction switch that is not fully turned on, the motor drive module can only receive the drive signal generated by the direction switch to be adjusted, and can also complete the adjustment of the corresponding direction in combination with the motor.

[0039] For details, please refer to Figure 3 The linkage protection module includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a resistor R2, a resistor R3 and a diode D3. Figure 3 As shown, the first end of the switch tube Q2 is grounded through the first switch in the first group of directional switches, the second end of the switch tube Q2 is connected to the cathode of the diode D3, and the control end of the switch tube Q2 is connected to the power supply through the resistor R2. The first end of the switch tube Q1 is grounded through the second switch in the fourth group of directional switches, the second end of the switch tube Q1 is connected to the cathode of the diode D3, and the control end of the switch tube Q1 is connected to the power supply through the resistor R2. The first end of the switch tube Q3 is connected to the power supply through the resistor R2, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the anode of the diode D3 through the resistor R3. The anode of the diode D3 is connected to the power supply through the second switch in the second group of directional switches and the second switch in the third group of directional switches, respectively, and the cathode of the diode D3 is connected to the machine drive module.

[0040] The drive switch module also includes a rearview mirror selection switch, which is a double-pole double-throw switch. The rearview mirror selection switch responds to the user's rearview mirror selection action. Figure 1a , the mirror selection switch corresponds to Figure 1a The toggle switch (or sliding switch) for selecting the left rearview mirror or the right rearview mirror is a double-pole double-throw switch, that is, if the first moving contact is connected to the first static contact, then the second moving contact must be connected to the third static contact; if the first moving contact is connected to the second static contact, then the second moving contact moves to connect to the fourth static contact.

[0041] like Figure 3 As shown, the four static contacts of the rearview mirror selection switch are respectively connected to the four driving pins of the motor drive module, the first moving contact of the rearview mirror selection switch is connected to the power supply through the second switch in the first group of directional switches, and the first moving contact of the rearview mirror selection switch is also grounded through the first switch in the second group of directional switches, the second moving contact of the rearview mirror selection switch is connected to the power supply through the first switch in the fourth group of directional switches, and the second moving contact of the rearview mirror selection switch is also grounded through the first switch in the third group of directional switches.

[0042] The four sets of directional switches in the drive switch module each contain two switches, such as Figure 3As shown, the first group of directional switches includes a first switch UP1 and a second switch UP2, the second group of directional switches includes a first switch DN1 and a second switch DN2, the third group of directional switches includes a first switch RH1 and a second switch RH2, and the fourth group of directional switches includes a first switch LH1 and a second switch LH2. It can be understood that the description of the first switch and the second switch is only for the convenience of explanation and does not indicate their importance or specific order.

[0043] The first end of the first switch UP1, the first end of the first switch DN1, the first end of the first switch RH1 and the first end of the second switch LH2 are all grounded, the second end of the first switch UP1 is connected to the first end of the switch tube Q2, the second end of the first switch DN1 is connected to the first moving contact, the second end of the first switch RH1 is connected to the second moving contact, and the second end of the second switch LH2 is connected to the first end of the switch tube Q1.

[0044] A first end of the second switch UP2, a first end of the second switch DN2, a first end of the second switch RH2, and a first end of the first switch LH1 are all connected to a power supply, a second end of the second switch UP2 is connected to the first moving contact, a second end of the second switch DN2 and a second end of the second switch RH2 are both connected to the anode of the diode D3, and a second end of the first switch LH1 is connected to the second moving contact.

[0045] The motor drive module includes a drive socket, which includes a drive pin MRH, a drive pin MLH, a drive pin MRV, a drive pin MLV and a main control pin MTR, the drive pin MRV is connected to the first static contact of the rearview mirror selection switch, the drive pin MLV is connected to the second static contact of the rearview mirror selection switch, the drive pin MRH is connected to the third static contact of the rearview mirror selection switch, the drive pin MLH is connected to the fourth static contact of the rearview mirror selection switch, and the main control pin MTR is connected to the cathode of the diode D3.

[0046] The motor driving module is also connected to a first motor and a second motor, the driving pin MRH and the driving pin MRV are both connected to the first end of the first motor, the driving pin MLH and the driving pin MLV are both connected to the first end of the second motor, and the second end of the first motor and the second end of the second motor are both connected to the main control pin MTR.

[0047] It should be noted that the abbreviations in the above-mentioned drive pins MRH, MLH, MRV and MLV are only for the convenience of explanation and marking their functions, and do not limit the names of the pins. Among them, MR represents the motor corresponding to the left rearview mirror, ML represents the motor corresponding to the right rearview mirror, V (vertical) represents vertical adjustment, and H (horizontal) represents horizontal adjustment. It can be understood that in the embodiment of the present application, the first motor is a motor for adjusting the left rearview mirror, and the second motor is a motor for adjusting the right rearview mirror.

[0048] In an embodiment of the present application, the power supply of the circuit can be provided by the power supply pin B of the drive socket. Normally, the power supply of the rearview mirror is adjusted to be around the voltage range of 9-12V, for example, a voltage of +12V can be provided.

[0049] Combination Figure 3 The principle of the circuit provided in the embodiment of the present application is described. Under normal circumstances, when the circuit is powered on, a high potential is provided to the control terminals of the switch tubes Q1 and Q2 through the pull-up resistor R2, and the switch tubes Q1 and Q2 both remain in the on state.

[0050] If the user accidentally presses switch UP1 when wanting to adjust to the right, then switch UP1, switch RH1 and switch RH2 are turned on at the same time. When switch RH2 is turned on, the rear stage is at a high potential. After passing through diode D3, the potential of resistor R3 is pulled high, and switch tube Q3 is turned on, thereby lowering the control ends of switch tubes Q1 and Q2. Switch tubes Q1 and Q2 are disconnected, cutting off the high potential of switch UP1, thereby avoiding short circuit.

[0051] If the user accidentally presses switch LH2 when trying to adjust downward, switch LH2, switch DN1 and switch DN2 are turned on at the same time. When switch DN2 is turned on, the rear stage is at a high potential. After passing through diode D3, the potential of resistor R3 is pulled up, and switch tube Q3 is turned on, which also pulls down the control ends of switch tubes Q1 and Q2. Switch tubes Q1 and Q2 are disconnected, cutting off the high potential of switch LH2, thereby avoiding short circuit.

[0052] In addition, if there is no operation (not conducting) at switch RH2 and switch DN2, the subsequent stage is at a low potential, and the resistor R3 is also at a low potential, so the switch tube Q3 is not conducting, the control ends of the switch tubes Q1 and Q2 are both at a high potential, and the switch tubes Q1 and Q2 are both conducting, which does not affect the operation of other switches (conducting or disconnecting).

[0053] The rearview mirror adjustment circuit provided by the embodiment of the present application includes a driving switch module, a linkage protection module and a motor driving module, wherein the direction switch in the driving switch module is closed in response to the user's key action and provides a driving signal to the motor driving module when closed, and the linkage protection module can block the driving signal generated by the incompletely closed direction switch when the driving signal is not unique, so that the motor driving module drives the motor according to the appropriate driving signal to adjust the rearview mirror. The circuit not only completes the key linkage protection with a simple circuit structure, has a low cost, and provides a good user experience for the user, but also is easy to debug, and on this basis reduces the precision requirements of the key-related structure, facilitates the production of the product, and has a wide range of applications.

[0054] The embodiment of the present application provides a vehicle rearview mirror, which includes the rearview mirror adjustment circuit provided in the above embodiment, and specifically has the technical features and technical effects of the rearview mirror adjustment circuit in the above embodiment. For technical details not described in this embodiment, please refer to the above rearview mirror adjustment circuit embodiment.

[0055] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A rearview mirror adjustment circuit, characterized in that: It includes a driving switch module, a linkage protection module and a motor driving module, wherein the linkage protection module is connected to the driving switch module and the motor driving module respectively, and the motor driving module is also connected to a motor; The driving switch module includes four groups of directional switches, each group of the directional switches includes a first switch and a second switch, the directional switches are used to respond to a key action of a user, turn on according to the key action, and provide a driving signal to the motor driving module when turned on, wherein the key action is a key action of the user to adjust the direction of the rearview mirror, and each direction key action corresponds to a driving signal; The linkage protection module is used to block the driving signal generated by the direction switch that is not fully turned on when the driving signal is not unique, wherein the direction switch that is not fully turned on means that only one of the direction switches is turned on; The motor driving module is used to drive the motor according to the driving signal to adjust the rearview mirror.

2. The rearview mirror adjustment circuit according to claim 1, characterized in that: The linkage protection module includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a resistor R2, a resistor R3 and a diode D3; The first end of the switch tube Q2 is grounded through the first switch in the first group of directional switches, the second end of the switch tube Q2 is connected to the cathode of the diode D3, and the control end of the switch tube Q2 is connected to the power supply through the resistor R2; The first end of the switch tube Q1 is grounded through the second switch in the fourth group of directional switches, the second end of the switch tube Q1 is connected to the cathode of the diode D3, and the control end of the switch tube Q1 is connected to the power supply through the resistor R2; The first end of the switch tube Q3 is connected to the power supply through the resistor R2, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the anode of the diode D3 through the resistor R3; The anode of the diode D3 is connected to the power supply through the second switch in the second group of directional switches and the second switch in the third group of directional switches, and the cathode of the diode D3 is connected to the motor driving module.

3. The rearview mirror adjustment circuit according to claim 2, characterized in that: The switch tube Q1 and the switch tube Q2 are both NMOS tubes.

4. The rearview mirror adjustment circuit according to claim 2, characterized in that: The switch tube Q3 is an NPN transistor.

5. The rearview mirror adjustment circuit according to claim 2, characterized in that: The drive switch module further includes a rearview mirror selection switch, the rearview mirror selection switch is a double-pole double-throw switch, and the rearview mirror selection switch responds to the user's rearview mirror selection action; The four static contacts of the rearview mirror selection switch are respectively connected to the four driving pins of the motor drive module, the first moving contact of the rearview mirror selection switch is connected to the power supply through the second switch in the first group of directional switches, the first moving contact of the rearview mirror selection switch is also grounded through the first switch in the second group of directional switches, the second moving contact of the rearview mirror selection switch is connected to the power supply through the first switch in the fourth group of directional switches, and the second moving contact of the rearview mirror selection switch is also grounded through the first switch in the third group of directional switches.

6. The rearview mirror adjustment circuit according to claim 5, characterized in that: The first group of directional switches includes a first switch UP1 and a second switch UP2, the second group of directional switches includes a first switch DN1 and a second switch DN2, the third group of directional switches includes a first switch RH1 and a second switch RH2, and the fourth group of directional switches includes a first switch LH1 and a second switch LH2; The first end of the first switch UP1, the first end of the first switch DN1, the first end of the first switch RH1, and the first end of the second switch LH2 are all grounded, the second end of the first switch UP1 is connected to the first end of the switch tube Q2, the second end of the first switch DN1 is connected to the first moving contact, the second end of the first switch RH1 is connected to the second moving contact, and the second end of the second switch LH2 is connected to the first end of the switch tube Q1; A first end of the second switch UP2, a first end of the second switch DN2, a first end of the second switch RH2, and a first end of the first switch LH1 are all connected to a power supply, a second end of the second switch UP2 is connected to the first moving contact, a second end of the second switch DN2 and a second end of the second switch RH2 are both connected to the anode of the diode D3, and a second end of the first switch LH1 is connected to the second moving contact.

7. The rearview mirror adjustment circuit according to claim 5, characterized in that: The motor drive module includes a drive socket, which includes a drive pin MRH, a drive pin MLH, a drive pin MRV, a drive pin MLV and a main control pin MTR, the drive pin MRV is connected to the first static contact of the rearview mirror selection switch, the drive pin MLV is connected to the second static contact of the rearview mirror selection switch, the drive pin MRH is connected to the third static contact of the rearview mirror selection switch, the drive pin MLH is connected to the fourth static contact of the rearview mirror selection switch, and the main control pin MTR is connected to the cathode of the diode D3.

8. The rearview mirror adjustment circuit according to claim 7, characterized in that: The driving socket further comprises a power supply pin B, and the power supply pin B is used for providing power.

9. The rearview mirror adjustment circuit according to claim 7, characterized in that: The motor driving module is also connected to a first motor and a second motor, the driving pin MRH and the driving pin MRV are both connected to the first end of the first motor, the driving pin MLH and the driving pin MLV are both connected to the first end of the second motor, and the second end of the first motor and the second end of the second motor are both connected to the main control pin MTR.

10. A rearview mirror for an automobile, characterized in that: It comprises a rearview mirror adjustment circuit as described in any one of claims 1 to 9.

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