CN212685416U - Power supply circuit of electronic anti-dazzle rearview mirror - Google Patents
Power supply circuit of electronic anti-dazzle rearview mirror Download PDFInfo
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- CN212685416U CN212685416U CN202021532531.2U CN202021532531U CN212685416U CN 212685416 U CN212685416 U CN 212685416U CN 202021532531 U CN202021532531 U CN 202021532531U CN 212685416 U CN212685416 U CN 212685416U
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Abstract
The utility model relates to a power supply circuit of anti-dazzle rear-view mirror of electron, including main control unit, the digital analog converter who is used for exporting multistage change voltage signal in the master controller is set up, the voltage that is connected with digital analog converter is followed and is expanded the class circuit and follow the anti-dazzle rear-view mirror that expands class circuit's output and be connected with the voltage, main control unit detects light according to the optical sensor in the anti-dazzle rear-view mirror and changes, obtain corresponding digital signal through the software algorithm, then export multistage change voltage through digital analog converter, the multistage change voltage of output follows through the voltage and expands class circuit and carry out the current amplification, the anti-dazzle rear-view mirror action of final drive, this power supply circuit has increased the reflectivity progression of anti-dazzle rear-view mirror, make its change than obvious, give the.
Description
Technical Field
The utility model belongs to the technical field of anti-dazzle rear-view mirror technique and specifically relates to a power supply circuit of anti-dazzle rear-view mirror of electron is related to.
Background
Although the rearview mirror is an auxiliary tool in the accessories of the motor vehicle, the frequency of use is very high. Especially, the device is needed to be used when overtaking, backing and turning. Its function is to observe the situation behind the car. However, if strong light is irradiated on the non-glare rearview mirror under certain conditions, visual vertigo of a driver can be caused, driving of the driver is seriously affected, and traffic accidents can be caused. Through research, dizziness can cause that the response of a driver is 1.4 seconds slower than normal conditions at ordinary times, thereby causing traffic safety accidents. In order to prevent the rear vehicle or the external environment from generating reflected light due to the incidence of strong light so as to cause glare phenomenon of a driver to influence driving safety, more and more vehicles are provided with rearview mirrors with anti-glare functions.
The anti-dazzle rearview mirror of electron detects the light change in its place ahead and rear through optical sensor and adjusts the reflectivity of mirror, reduces the light intensity of reflecting in driver's eyes, gives driver more comfortable safe experience.
However, the existing electronic anti-dazzle rearview mirror generally has the defects that the level number of reflectivity is few, the change ratio is not obvious, and the driver can not experience more comfortably.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a reflectivity progression is many is provided, the power supply circuit of the anti-dazzle rear-view mirror of electron that can improve driver's experience.
The utility model provides a technical scheme is, a power supply circuit of anti-dazzle rear-view mirror of electron, including main control unit, set up the digit analog converter that is used for exporting multistage change voltage signal in the main control unit, follow the voltage of being connected with the digit analog converter and expand a class circuit and follow the anti-dazzle rear-view mirror of being connected with the output that expands a class circuit with voltage.
The utility model has the advantages that: by adopting the power supply circuit of the electronic anti-dazzle rearview mirror, the main controller detects light changes according to the optical sensor in the anti-dazzle rearview mirror, corresponding digital signals are obtained through a software algorithm, then multi-level change voltage is output through the digital-to-analog converter, the output multi-level change voltage is subjected to current amplification through the voltage following current expansion circuit, and finally the anti-dazzle rearview mirror is driven to act.
Preferably, the power supply circuit of the electronic anti-glare rearview mirror further comprises a voltage detection circuit, one end of the voltage detection circuit is connected with the output end of the voltage following current expansion circuit, the other end of the voltage detection circuit is connected with the main controller, the voltage detection circuit is used for monitoring the output voltage of the voltage following current expansion circuit, and whether the anti-glare rearview mirror breaks down or not is judged according to the obtained output voltage.
Preferably, the voltage-follower current-expanding circuit includes an operational amplifier U1B and a transistor Q1 connected to the operational amplifier U1B, and the circuit having this configuration can amplify the current of the output multi-level variable voltage, and has both strong load-carrying capability and good response speed.
Preferably, the voltage detection circuit comprises a diode D1 and an operational amplifier U1A connected with the diode D1, with the structural circuit, the diode D1 plays a role of overvoltage protection, the operational amplifier U1A is used for constantly sampling the voltage output by the output end of the voltage following current amplification circuit, monitoring the output voltage, judging the working state of the anti-dazzle rearview mirror according to the voltage, and performing corresponding control.
Preferably, the model of the operational amplifier U1B is MCP6002T-E/SNVAC, and the operational amplifier can ensure that the voltage following current amplifying circuit has strong loading capacity and good response speed.
Preferably, the type of the triode Q17 is njvd 3055T4G, and by adopting the triode of the type, the voltage following current amplifying circuit can be ensured to have strong loading capacity and good response speed.
Drawings
Fig. 1 is a circuit block diagram of a power circuit of an electronic anti-glare rearview mirror of the present invention;
fig. 2 is a schematic circuit diagram of the medium voltage following current amplifying circuit of the present invention;
fig. 3 is a schematic circuit diagram of the medium voltage detection circuit of the present invention;
as shown in the figure: 1. a main controller; 2. a digital-to-analog converter; 3. a voltage following current expansion circuit; 4. an anti-glare rearview mirror; 5. a voltage detection circuit.
Detailed Description
The invention is further described below with reference to the accompanying drawings in combination with the embodiments so that those skilled in the art can implement the invention with reference to the description, and the scope of the invention is not limited to the embodiments.
The utility model relates to a power supply circuit of anti-dazzle rear-view mirror of electron, as shown in figure 1, including main control unit 1, set up be used for exporting multistage change voltage signal's digital analog converter 2 in main control unit 1, follow with the voltage that digital analog converter 2 is connected and expand a class circuit 3 and follow with the voltage and expand anti-dazzle rear-view mirror 4 that class circuit 3's output is connected. The power supply circuit of the electronic anti-dazzle rearview mirror in fig. 1 is characterized in that a main controller 1 detects light changes according to an optical sensor in the anti-dazzle rearview mirror, corresponding digital signals are obtained through a software algorithm, then multistage change voltage is output through a pin of a digital-to-analog converter 2, the stage change range value of the digital-to-analog converter 2 is 2^10 ^ 1024, the output multistage change voltage is subjected to current amplification through a voltage following current expansion circuit 3, and finally, an anti-dazzle rearview mirror 4 is driven to act.
As shown in fig. 1, the power supply circuit of the electronic anti-glare rearview mirror further comprises a voltage detection circuit 5, one end of the voltage detection circuit is connected with the output end of the voltage following current expansion circuit 3, and the other end of the voltage detection circuit is connected with the main controller 1.
As shown in fig. 2, the voltage-follower current-expanding circuit 3 includes an operational amplifier U1B and a transistor Q17 connected to the operational amplifier U1B, and the circuit having this configuration can amplify the current of the output multi-level variable voltage, and has both strong on-load capability and good response speed.
As shown in fig. 3, the voltage detection circuit 5 includes a diode D1 and an operational amplifier U1A connected to the diode D1, and with this structure, the diode D1 plays a role of overvoltage protection, and the operational amplifier U1A is used to constantly pick up the voltage output by the output terminal of the current amplification circuit, monitor the output voltage, determine the working state of the anti-glare rearview mirror according to the voltage, and perform corresponding control. In fig. 3, the diode D1 and the current limiting resistor R5 function to prevent damage to the operational amplifier U1A. While the voltage detection circuit 5 monitors for a high voltage input, the main controller 1 can record an abnormal input.
As shown in FIG. 2, the model of the operational amplifier U1B is MCP6002T-E/SNVAC, and the operational amplifier can ensure that the voltage-following current-amplifying circuit has strong load-carrying capacity and good response speed.
As shown in fig. 3, the type of the triode Q17 is njvd 3055T4G, and the adoption of the triode of this type can ensure that the voltage following current amplifying circuit has strong load carrying capability and good response speed.
The utility model provides a power supply circuit of anti-dazzle rear-view mirror of electron, main control unit 1 change according to the light that light sensor detected, behind the software algorithm, target voltage V is exported to the output pin of rethread digital-to-analog converter 2EC_DAC. Theoretically VEC_DACThe voltage output range is 0-Vref (Vref: DAC reference voltage of MCU), and the resolution is: 2^10 ^ 1024, the minimum resolution voltage of voltage is: vref/(2^10) ═ Vref/1024, and 3.3V or 5V is generally selected as Vref. Vref is selected to be 3.3V.
Voltage VEC_DACThe voltage Vec _ p is supplied to the glare-proof mirror 4 via a voltage divider and a voltage follower in the circuit of fig. 2, the voltage divider in fig. 2 being composed of a resistor R11 and a resistor R12, and the voltage follower being composed of an operational amplifier U1B.
The working voltage of the general anti-dazzle rearview mirror 4 is 0-1.45V, and the normal voltage is 1.2V. Maximum load current: 0.2-0.35A. Therefore, the method comprises the following steps: vec _ p Voltage Range: vecdac G1G 2
＝(0～Vref)*0.4*1
＝(0～3.3)*0.4*1＝0～1.32V
G1 is a voltage divider formed by resistors, and G1 is R12/(R11+ R12) is 2/(2+3) is 0.4;
g2, voltage follower gain, G2 equals 1.
Range of current: the maximum current of the glare-proof mirror 4 is generally 0.35A, and the current of the transistor Q17 is selected according to the maximum current of the glare-proof mirror 4. The transistor is selected to be 1A or more in consideration of application of EC via short circuit or the like.
The voltage detection circuit 5 monitors the output voltage of the voltage following current expansion circuit 3 in real time, the working state of the anti-dazzle rearview mirror is judged according to the obtained output voltage, when the EC mirror is in short circuit, the sampling output low voltage of the voltage sampling circuit is 0V, and software can judge that the anti-dazzle rearview mirror is in short circuit; when the EC mirror is cascaded into a high voltage, D2 blocks the voltage from continuing to interfere with the voltage through the parasitic diode of Q1.
Claims (6)
1. A power supply circuit of an electronic anti-dazzle rearview mirror is characterized in that: the device comprises a main controller (1), a digital-to-analog converter (2) arranged in the main controller (1) and used for outputting multi-level variable voltage signals, a voltage following current expanding circuit (3) connected with the digital-to-analog converter (2), and an anti-dazzle rearview mirror (4) connected with the output end of the voltage following current expanding circuit (3).
2. The power supply circuit of an electronic anti-glare rearview mirror according to claim 1, characterized in that: the power supply circuit of the electronic anti-dazzle rearview mirror further comprises a voltage detection circuit (5) with one end connected with the output end of the voltage following current expansion circuit (3) and the other end connected with the main controller (1).
3. The power supply circuit of an electronic anti-glare rearview mirror according to claim 1, characterized in that: the voltage following current expansion circuit (3) comprises an operational amplifier U1B and a triode Q17 connected with the operational amplifier U1B.
4. The power supply circuit of an electronic anti-glare rearview mirror according to claim 2, characterized in that: the voltage detection circuit (5) includes a diode D1 and an operational amplifier U1A connected to a diode D1.
5. A power supply circuit of an electronic anti-glare rearview mirror according to claim 3, characterized in that: the model of the operational amplifier U1B is MCP 6002T-E/SNVAC.
6. A power supply circuit of an electronic anti-glare rearview mirror according to claim 3, characterized in that: the model of the triode Q17 is NJVMJD3055T 4G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021532531.2U CN212685416U (en) | 2020-07-29 | 2020-07-29 | Power supply circuit of electronic anti-dazzle rearview mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021532531.2U CN212685416U (en) | 2020-07-29 | 2020-07-29 | Power supply circuit of electronic anti-dazzle rearview mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212685416U true CN212685416U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021532531.2U Active CN212685416U (en) | 2020-07-29 | 2020-07-29 | Power supply circuit of electronic anti-dazzle rearview mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212685416U (en) |
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2020
- 2020-07-29 CN CN202021532531.2U patent/CN212685416U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315033 1st floor, building 12, No. 525, Changxing Road, Jiangbei District, Ningbo City, Zhejiang Province Patentee after: Ningbo Huaxiang Video Electronics Co.,Ltd. Address before: 315033 1st floor, building 12, No. 525, Changxing Road, Jiangbei District, Ningbo City, Zhejiang Province Patentee before: Ningbo Feng Mei Video Electronics Co.,Ltd. |