CN214381520U - Control circuit of car light and vehicle - Google Patents
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Abstract
The application discloses control circuit and vehicle of car light. The control circuit comprises a processor, a digital-to-analog converter, a voltage input module and a voltage output module, wherein the digital-to-analog converter is electrically connected with the processor, the voltage input module and the voltage output module respectively; the processor is used for transmitting a control command to the digital-to-analog converter to determine an adjusting coefficient, the voltage input module is used for providing reference voltage to the digital-to-analog converter, the digital-to-analog converter is used for determining adjusting voltage according to the adjusting coefficient and the reference voltage, and the voltage output module is used for outputting the adjusting voltage to control the inclination angle of the vehicle lamp to adjust. In the control circuit of the application, the fine adjustment of the car lamp inclination angle can be realized by determining and outputting the adjusting voltage according to the control command and the reference voltage of the processor, so that the car lamp inclination angle is finely controlled.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a control circuit of a car lamp and a car.
Background
In the related art, the control of the tilt angle of the headlights of the vehicle may be implemented by adjusting the output voltage of the tilt controller by toggling the shift switch of the tilt controller. However, since the shift of the shift switch is limited, the tilt angle of the headlamp cannot be finely controlled.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the application provides a control circuit of a vehicle lamp and a vehicle.
The control circuit of the embodiment of the application is characterized by comprising a processor, a digital-to-analog converter, a voltage input module and a voltage output module, wherein the digital-to-analog converter is electrically connected with the processor, the voltage input module and the voltage output module respectively; wherein,
the processor is used for transmitting a control command to the digital-to-analog converter to determine an adjusting coefficient;
the voltage input module is used for providing a reference voltage for the digital-to-analog converter;
the digital-to-analog converter is used for determining an adjusting voltage according to the adjusting coefficient and the reference voltage;
the voltage output module is used for outputting the adjusting voltage to control the inclination angle of the car lamp to adjust.
In some embodiments, the voltage input module includes a first voltage-dividing resistor and a first operational amplifier, the first operational amplifier includes a first positive input terminal, a first negative input terminal and a first output terminal, the first voltage-dividing resistor is respectively connected to a power supply voltage terminal and the first positive input terminal, the first output terminal is connected to the first negative input terminal and the digital-to-analog converter, and the first output terminal is configured to transmit the reference voltage to the digital-to-analog converter.
In some embodiments, the first voltage dividing resistor comprises:
the first end of the first voltage-dividing sub-resistor is connected with a power supply voltage end, and the second end of the first voltage-dividing sub-resistor is connected with the positive input end;
and the first end of the second voltage-dividing sub-resistor is connected with the second end of the first voltage-dividing sub-resistor, and the second end of the second voltage-dividing sub-resistor is connected with a grounding end.
In some embodiments, the voltage input module further comprises:
and the first end of the filter capacitor is connected with the grounding end, and the second end of the filter capacitor is connected with the first positive input end and used for filtering interference waves of the first positive input end.
In some embodiments, the voltage input module further comprises:
and the voltage stabilizing resistor is respectively connected with the first negative electrode input end and the first output end.
In some embodiments, the voltage output module comprises a second operational amplifier and a second voltage dividing resistor; the second operational amplifier comprises a second positive input end, a second negative input end and a second output end, the second positive input end is connected with the digital-to-analog converter, the second divider resistor is respectively connected with the second negative input end, the second output end and the ground end, and the second output end is used for outputting the regulated voltage.
In some embodiments, the second voltage-dividing resistor further comprises:
a first end of the third voltage-dividing sub-resistor is connected with the grounding end, and a second end of the third voltage-dividing sub-resistor is connected with the second negative input end;
and the first end of the fourth voltage dividing sub-resistor is connected with the second end of the third voltage dividing sub-resistor, and the second end of the fourth voltage dividing sub-resistor is connected with the second output end.
In some embodiments, the ratio of the first voltage divider sub-resistance to the second voltage divider sub-resistance and the ratio of the fourth voltage divider sub-resistance to the third voltage divider sub-resistance are equal.
In some embodiments, the processor is coupled to the digital-to-analog converter through a serial peripheral interface.
The vehicle of the embodiment of the application comprises a lamp and the control circuit of any one of the above embodiments, wherein the control circuit is used for adjusting the inclination angle of the lamp.
In the control circuit of car light and the vehicle of this application embodiment, through the setting to treater, digital-to-analog converter, voltage input module and voltage output module, digital-to-analog converter can confirm the regulation voltage that is used for controlling the car light inclination according to the reference voltage of receiving the voltage input module input and the adjustment coefficient that the control command that the treater input corresponds, realizes carrying out the control of refining to the inclination of car light. Therefore, when the reference voltage is constant, the adjusting voltage can be changed through a control command, so that the car lamp inclination angle can be finely controlled.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block schematic diagram of a control circuit for a vehicle lamp according to some embodiments of the present application;
FIG. 2 is a schematic diagram of a control circuit for a vehicle lamp according to some embodiments of the present application;
FIG. 3 is a block schematic diagram of a control device according to certain embodiments of the present application;
reference numerals for the main elements:
a power supply voltage Vbat, a reference voltage Vref, and a regulation voltage Vout;
a processor 11;
a digital-to-analog converter 12;
the voltage input module 13, a first voltage-dividing resistor 132, a first voltage-dividing sub-resistor R1, a second voltage-dividing sub-resistor R2, a first operational amplifier 134, a filter capacitor C, and a voltage-stabilizing resistor R5;
the voltage output module 14, the second voltage divider resistor 142, the third voltage divider resistor R3, the fourth voltage divider resistor R4, and the second operational amplifier 144;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
With the development of vehicle electronics, vehicles become more and more intelligent. To ensure the driving safety of drivers and reduce the risk of traffic accidents, more and more vehicles are provided with an inclination controller for adjusting the inclination of the lamp. The inclination controller can adjust the inclination of the headlights of the vehicle so that the vehicle can adapt to different environments, for example, when ascending, the inclination of the headlights can be lowered through the inclination adjusting device so that the headlights can illuminate the road surface.
In the correlation technique, the output voltage that the inclination controller was adjusted to the headlight inclination control accessible of vehicle stirs the gear switch of inclination controller realizes, however, on the one hand, because the gear of gear switch is limited, can't accomplish the control that becomes more meticulous to the headlight inclination, on the other hand, because the gear switch need be used for manual stirring, need the driver frequently to stir the gear when road conditions are complicated and adjust the headlight inclination, increased the risk of traffic accident.
In view of the above, referring to fig. 1, the present embodiment provides a control circuit 10 for a vehicle lamp, for controlling an inclination angle of the vehicle lamp. The control circuit 10 includes a processor 11, a digital-to-analog converter 12, a voltage input module 13, and a voltage output module 14. The digital-to-analog converter 12 is electrically connected to the processor 11, the voltage input module 13 and the voltage output module 14, respectively.
Wherein the processor 11 is configured to transmit a control command to the digital-to-analog converter 12 to determine the adjustment coefficient. The voltage input module 13 is used to provide a reference voltage Vref to the digital-to-analog converter 12. The digital-to-analog converter 12 is used to determine the regulation voltage Vout from the regulation coefficient and the reference voltage Vref. The voltage output module 14 is used for outputting a regulation voltage Vout to control the inclination angle of the vehicle lamp for regulation.
In the control circuit 10 of the present application, through setting the processor 11, the digital-to-analog converter 12, the voltage input module 13, and the voltage output module 14, the digital-to-analog converter 12 can determine the adjustment voltage Vout for controlling the inclination angle of the vehicle lamp according to the reference voltage Vref received from the voltage input module 13 and the adjustment coefficient corresponding to the control command input from the processor 11, so as to realize the fine control of the inclination angle of the vehicle lamp. Thus, when the reference voltage Vref is constant, the output regulation voltage Vout can be changed through a control command, so that the vehicle lamp inclination angle can be finely controlled.
It should be noted that, the processor 11 may obtain the current state of the vehicle in real time, process the current state of the vehicle, calculate the target inclination angle of the vehicle lamp in the current state, and generate the corresponding control command according to the target inclination angle of the vehicle lamp. The state of the vehicle can be obtained from sensors of the vehicle, that is, the processor 11 can calculate the target inclination angle of the vehicle light at the current situation according to the data obtained by the processor 11 in the vehicle. The control command includes a plurality of bits, each of which may be represented by a plurality of binary bits. For example, each control command may consist of a binary number of 4 bits, 6 bits, 8 bits, 10 bits, or 16 bits or even more. In the present application, the control command may be represented by a binary number of eight bits, and it is understood that the value of eight bits may represent 256 kinds of control commands, for example, control command 1 is 00000001, control command 2 is 00000010, control command 3 is 00000011 … …, control command 255 is 11111110, and control command 256 is 11111111.
It will be appreciated that the digital-to-analog converter 12 is a converter that converts a discrete signal in the form of a binary digital quantity into an analog quantity referenced to a standard quantity (or reference quantity). The digital-to-analog converter 12 may employ an eight-bit digital-to-analog conversion chip.
After the digital-to-analog converter 12 receives the control command, the control command may be automatically converted into a corresponding adjustment coefficient, and the magnitude of the adjustment voltage Vout output by the voltage output module 14 may be determined according to the adjustment coefficient and the reference voltage Vref. It should be noted that the regulation voltage Vout is in positive correlation with the regulation coefficient, that is, each regulation coefficient corresponds to one regulation voltage Vout under the condition that the reference voltage Vref is not changed, and the larger the regulation coefficient is, the larger the regulation voltage Vout is. It can be understood that, since the adjustment system is generated by control commands, each adjustment coefficient corresponds to one control command, the adjustment of the output adjustment voltage Vout can be realized by inputting the control commands, thereby realizing the control of the inclination angle of the vehicle lamp. For example, in the present application, the control command includes 256, and the output regulated voltage Vout corresponds to 256, that is, 256 gear positions for adjusting the inclination angle of the vehicle lamp.
Further, the processor 11 may be connected to the digital-to-analog converter 12 through a Serial Peripheral Interface (SPI), so as to transmit the control command to the digital-to-analog converter 12 through the SPI. SPI is a serial interface protocol that communicates over 4 signal lines, including master/slave modes. The SPI is characterized in that the communication between the master device and the slave device is determined by the presence or absence of a clock signal of the master device, and data transmission is started once the clock signal of the master device is detected. The SPI has the characteristics of a small number of occupied interface lines, high communication efficiency, and the like, and thus, the design of the control circuit 10 is simplified.
The voltage input module 13 may also be electrically connected to the supply voltage terminal to receive the supply voltage Vbat of the supply voltage terminal and generate the reference voltage Vref. The reference voltage Vref is less than or equal to the power supply voltage Vbat input from the power supply voltage terminal, for example, the power supply voltage Vbat of the power supply voltage terminal is 12V, and the reference voltage Vref is 50 mV. Of course, in some other embodiments, if the power voltage Vbat of the power voltage end is equal to the reference voltage Vref, the power voltage end may be directly connected to the digital-to-analog converter 12, that is, the power voltage Vbat of the power voltage end is input to the digital-to-analog converter 12 as the reference voltage Vref.
Referring to fig. 2, in some embodiments, the voltage input module 13 includes a first voltage-dividing resistor 132 and a first operational amplifier 134, the first voltage-dividing resistor 132 is electrically connected to the power voltage terminal and the first operational amplifier 134, the first operational amplifier 134 is further electrically connected to the digital-to-analog converter 12, and the first operational amplifier 134 and the first voltage-dividing resistor 132 are used for scaling the power voltage Vbat of the power voltage terminal to the reference voltage Vref. The reduction factor is not limited, and may be, for example, 10 times, 20 times or more.
Specifically, the first operational amplifier 134 includes a first positive input terminal, a first negative input terminal and a first output terminal, the first voltage dividing resistor 132 is respectively connected to the power supply voltage terminal and the first positive input terminal, the first output terminal is connected to the first negative input terminal and the digital-to-analog converter 12, and the first output terminal is used for transmitting the reference voltage Vref to the digital-to-analog converter 12.
Further, the first voltage-dividing resistor 132 includes a first voltage-dividing sub-resistor R1 and a second voltage-dividing sub-resistor R2. The first end of the first voltage-dividing sub-resistor R1 is connected to the power supply voltage end, and the second end of the first voltage-dividing sub-resistor R1 is connected to the positive input end. The first terminal of the second voltage-dividing sub-resistor R2 is connected to the second terminal of the first voltage-dividing sub-resistor R1, and the second terminal of the second voltage-dividing sub-resistor R2 is connected to the ground terminal.
In the vehicle, the magnitude of the power supply voltage Vbat at of the power supply voltage terminal is usually 12V, 18V, or the like. The reference voltage Vref that can be received by the digital-to-analog converter 12 is typically small, for example, 30mV or 50 mV. Therefore, under the voltage division effect of the first voltage-dividing sub-resistor R1 and the second voltage-dividing sub-resistor R2, the voltage value of the first positive input terminal of the first digital-to-analog converter 12 is actually the voltage of the second voltage-dividing sub-resistor R2, so that the voltage at the first positive input terminal is smaller than the power supply voltage Vbat, and the smaller the resistance value of the second voltage-dividing sub-resistor R2, the smaller the voltage at the first positive input terminal. Further, the reference voltage Vref generated from the voltage at the first positive input terminal by the first operational amplifier 134 is small.
In some embodiments, the voltage input module 13 further comprises a filter capacitor C. The first end of the filter capacitor C is connected with the grounding end, and the second end of the filter capacitor C is connected with the first positive input end and used for filtering interference waves of the first positive input end.
It can be understood that, since there is an interference wave easily in the power supply voltage Vbat inputted from the power supply voltage terminal, the regulated voltage Vout outputted from the voltage output module 14 is easily fluctuated, thereby causing a disturbance to the tilt angle control of the vehicle lamp. Therefore, through the setting of the filter capacitor C, the interference wave input from the power input terminal to the first positive input terminal can be filtered, so that the voltage output module 14 can stably output the regulated voltage Vout, and the stable control of the inclination angle of the vehicle lamp by the control circuit 10 is ensured.
In some embodiments, the voltage input module 13 further includes a voltage regulator resistor R5, and the voltage regulator resistor R5 is connected to the first negative input terminal and the first output terminal, respectively. The voltage stabilizing resistor R5 is used for ensuring the first output end to output stable reference voltage Vref, and it can be understood that when the voltage stabilizing resistor R5 is connected with the first negative electrode input end and the first output end respectively, the first negative electrode input end and the first output end form a negative feedback closed loop, the reference voltage Vref of the first output end can be ensured to follow the input end, so that the reference voltage Vref is stable, and the driving capability of the first operational amplifier 134 is improved.
The voltage output module 14 is configured to generate a corresponding adjustment voltage V according to the adjustment coefficient and the reference voltage Vref, and output the adjustment voltage V to adjust the inclination angle of the vehicle lamp.
Specifically, the voltage output module 14 includes a second operational amplifier 144 and a second voltage-dividing resistor 142. The second operational amplifier 144 includes a second positive input terminal, a second negative input terminal, and a second output terminal, the second positive input terminal is connected to the digital-to-analog converter 12, the second voltage-dividing resistor 142 is connected to the second negative input terminal, the second output terminal, and the ground terminal, respectively, and the second operational amplifier 144 generates the regulated voltage Vout according to the voltage input by the second positive input terminal, and outputs the regulated voltage Vout from the second output terminal.
The voltage output module 14 is actually equivalent to a voltage amplifying circuit, and can amplify the input voltage proportionally. In the present embodiment, the voltage output block 14 is amplified by a factor equal to the reduction factor of the intermediate voltage input block 13, so that the reference voltage Vref can be generated by the voltage output block 14 into the regulated voltage Vout equal to the power supply voltage Vbat after the power supply voltage Vbat is generated into the reference voltage Vref by the voltage input block 13.
Further, the second voltage divider resistor 142 further includes a third voltage divider resistor R3 and a fourth voltage divider resistor R4. The first terminal of the third voltage-dividing sub-resistor R3 is connected to the ground terminal, and the second terminal of the third voltage-dividing sub-resistor R3 is connected to the second negative input terminal. A first terminal of the fourth voltage divider sub-resistor R4 is connected to the second terminal of the third voltage divider sub-resistor R3, and a second terminal of the fourth voltage divider sub-resistor R4 is connected to the second output terminal.
Note that the ratio of the first voltage-dividing sub-resistor R1 to the second voltage-dividing sub-resistor R2 is equal to the ratio of the fourth voltage-dividing sub-resistor R4 to the third voltage-dividing sub-resistor R3. For example, the resistance value of the first voltage-dividing sub-resistor R1 may be equal to the resistance value of the fourth voltage-dividing sub-resistor R4. The resistance value of the second voltage-dividing sub-resistor R2 is equal to the resistance value of the third voltage-dividing sub-resistor R3. In this way, the voltage output module 14 can generate the reference voltage Vref to the regulated voltage Vout equal to the power supply voltage Vbat.
Referring to fig. 3, a vehicle 100 according to an embodiment of the present application includes a lamp 20 and a control circuit 10 according to any one of the above embodiments, and the control circuit 10 is configured to adjust an inclination of the lamp 20.
Specifically, the vehicle 100 may further include a driving motor (not shown in the figure), the driving motor is electrically connected to the control circuit 10 and the lamp 20, and the control circuit 10 is configured to output a regulating voltage to the driving motor to drive the driving motor to regulate the inclination angle of the lamp 20.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A control circuit of a car lamp is characterized by comprising a processor, a digital-to-analog converter, a voltage input module and a voltage output module, wherein the digital-to-analog converter is electrically connected with the processor, the voltage input module and the voltage output module respectively; wherein,
the processor is used for transmitting a control command to the digital-to-analog converter to determine an adjusting coefficient;
the voltage input module is used for providing a reference voltage for the digital-to-analog converter;
the digital-to-analog converter is used for determining an adjusting voltage according to the adjusting coefficient and the reference voltage;
the voltage output module is used for outputting the adjusting voltage to control the inclination angle of the car lamp to adjust.
2. The control circuit of claim 1, wherein the voltage input module comprises a first voltage-dividing resistor and a first operational amplifier, the first operational amplifier comprises a first positive input terminal, a first negative input terminal and a first output terminal, the first voltage-dividing resistor is respectively connected to a power supply voltage terminal and the first positive input terminal, the first output terminal is connected to the first negative input terminal and the digital-to-analog converter, and the first output terminal is used for transmitting the reference voltage to the digital-to-analog converter.
3. The control circuit of claim 2, wherein the first voltage dividing resistor comprises:
the first end of the first voltage-dividing sub-resistor is connected with a power supply voltage end, and the second end of the first voltage-dividing sub-resistor is connected with the positive input end;
and the first end of the second voltage-dividing sub-resistor is connected with the second end of the first voltage-dividing sub-resistor, and the second end of the second voltage-dividing sub-resistor is connected with a grounding end.
4. The control circuit of claim 2, wherein the voltage input module further comprises:
and the first end of the filter capacitor is connected with a grounding end, and the second end of the filter capacitor is connected with the first positive input end and used for filtering interference waves of the first positive input end.
5. The control circuit of claim 2, wherein the voltage input module further comprises:
and the voltage stabilizing resistor is respectively connected with the first negative electrode input end and the first output end.
6. The control circuit of claim 3, wherein the voltage output module includes a second operational amplifier and a second voltage dividing resistor; the second operational amplifier comprises a second positive input end, a second negative input end and a second output end, the second positive input end is connected with the digital-to-analog converter, the second divider resistor is respectively connected with the second negative input end, the second output end and the grounding end, and the second output end is used for outputting the regulated voltage.
7. The control circuit of claim 6, wherein the second voltage dividing resistor further comprises:
a first end of the third voltage-dividing sub-resistor is connected with the ground terminal, and a second end of the third voltage-dividing sub-resistor is connected with the second negative input terminal;
and the first end of the fourth voltage divider sub-resistor is connected with the second end of the third voltage divider sub-resistor, and the second end of the fourth voltage divider sub-resistor is connected with the second output end.
8. The control circuit of claim 7, wherein a ratio of the first voltage divider sub-resistance to the second voltage divider sub-resistance and a ratio of the fourth voltage divider sub-resistance to the third voltage divider sub-resistance are equal.
9. The control circuit of claim 1, wherein the processor is coupled to the digital-to-analog converter through a serial peripheral interface.
10. A vehicle comprising a lamp and a control circuit as claimed in any one of claims 1 to 9 for adjusting the tilt of the lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120373557.5U CN214381520U (en) | 2021-02-08 | 2021-02-08 | Control circuit of car light and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120373557.5U CN214381520U (en) | 2021-02-08 | 2021-02-08 | Control circuit of car light and vehicle |
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| CN214381520U true CN214381520U (en) | 2021-10-08 |
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