CN222051305U - A dimming rearview mirror driving circuit - Google Patents
A dimming rearview mirror driving circuit Download PDFInfo
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- CN222051305U CN222051305U CN202420071394.9U CN202420071394U CN222051305U CN 222051305 U CN222051305 U CN 222051305U CN 202420071394 U CN202420071394 U CN 202420071394U CN 222051305 U CN222051305 U CN 222051305U
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 10
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- 238000010586 diagram Methods 0.000 description 7
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- 230000002829 reductive effect Effects 0.000 description 3
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004313 glare Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000001579 optical reflectometry Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
The utility model discloses a dimming rearview mirror driving circuit, which is characterized by comprising the following components: the device comprises a booster circuit, an MCU micro-processing control circuit, a front photosensitive sensor circuit, a rear photosensitive sensor circuit, a time-regulating control circuit and an H-bridge circuit, wherein the booster circuit is electrically connected with a power supply; the boost circuit is connected with the MCU micro-processing control circuit, the front photosensitive sensor circuit is used for sensing the light intensity in front of the dimming rearview mirror, the rear photosensitive sensor circuit is used for sensing the light intensity in back of the dimming rearview mirror, one end of the H bridge circuit is electrically connected with the MCU micro-processing control circuit, the other end of the H bridge circuit is electrically connected with the liquid crystal film on the dimming rearview mirror, and the MCU micro-processing control circuit is used for driving and controlling the H bridge circuit. The dimming rearview mirror driving circuit can generate stable and reliable control voltage, and the control voltage is loaded on the liquid crystal film to achieve the purpose of rapid anti-dazzle of the automobile rearview mirror.
Description
Technical Field
The utility model relates to the technical field of dimming driving circuits, in particular to a dimming rearview mirror driving circuit.
Background
At present, in the field of automobile rearview mirrors, the rearview mirrors of middle-low-end vehicles do not have an anti-dazzle function, namely, when a car which is driven at night and is close to the back is provided with a high beam headlight, when strong light irradiates the left and right reflectors of the front car and the rearview mirrors in the center of a cockpit, as light rays are very strong, people see a piece of white light on the rearview mirrors to be very dazzled, and the front or back car is not easy to see, so that driving behaviors are dangerous (such as brake and lane change) due to the fact that the front or back car is seen clearly, the middle-high-end vehicles are all provided with the rearview mirrors with the anti-dazzle function at present, and the principle of the anti-dazzle function is that when the back is irradiated by the high beam headlight, the reflecting rate of the light rays is greatly reduced (such as the reflecting rate is reduced to 5% -10% of the original normal state), so that people cannot be stimulated to be dazzled, and cannot see the front and back car due to the strong light, and dangerous driving behaviors are not seen. The current anti-dazzle function adopts the technical means that an EC material (Eletrochromism) is mainly added into a rearview mirror glass panel, EC belongs to an electrochromic chemical material, under the action of alternating high-low or positive-negative external electric fields, charge is injected or extracted to generate a special phenomenon of reversible change between a low-transmittance color-forming state or a high-transmittance color-erasing state, the appearance is represented by reversible change of color and transparency, and when voltage is applied to two poles (charge injection), the material is chemically changed to be dark blue, so that light is absorbed in a large amount, and the reflectivity is greatly reduced to achieve the anti-dazzle effect. However, EC has a fatal disadvantage in that the reaction speed is very slow, and when it is powered up, it takes 3 to 6 seconds for chemical reaction to reduce the reflectivity of light, and when it takes 10 to 15 seconds for the power up to be removed, it is recovered to a normal state. It is known that the speed of a car is very fast and can reach 100-120 km per hour at high speed, namely 27-33 m per second, and the car is driven for 81-100 m per second according to the maximum 3 seconds, which causes that the driver does not react at all and can not cause glare, the driver can not see the front and rear situation (in the glare state at this time) before the rear view mirror is blacked, accidents are easy to occur (for example, rear-end collision is caused by no rear-end brake or traffic accident is caused by no front-rear lane change), and in addition, after the rear car is turned off or the lane change is left, the EC material recovery period is 10-15 seconds, and the rear view mirror is blacked, so that the rear car is not seen clearly, and traffic accidents are easy to occur.
Disclosure of utility model
The utility model mainly aims to provide a dimming rearview mirror driving circuit, which aims to solve the problem that the anti-dazzle speed of a rearview mirror with the anti-dazzle function is low at present.
In order to achieve the above object, the present utility model provides a driving circuit for a dimming rearview mirror, comprising:
the booster circuit is electrically connected with the power supply;
the MCU micro-processing control circuit is connected with the booster circuit,
The front photosensitive sensor circuit is used for sensing the light intensity in front of the dimming rearview mirror, converting the sensed light signal into an electric signal and transmitting the electric signal to the MCU micro-processing control circuit;
The rear photosensitive sensor circuit is used for sensing the light intensity behind the dimming rearview mirror, converting the sensed light signal into an electric signal and transmitting the electric signal to the MCU micro-processing control circuit;
The control circuit is connected with the MCU micro-processing control circuit and used for avoiding stroboscopic occurrence of a liquid crystal film on the dimming rearview mirror;
And one end of the H-bridge circuit is electrically connected with the MCU micro-processing control circuit, the other end of the H-bridge circuit is electrically connected with the liquid crystal film on the dimming rearview mirror, and the MCU micro-processing control circuit drives and controls the H-bridge circuit.
Preferably, the MCU micro-processing control circuit includes an MCU controller U6, pins 1 and 20 of the U6 are input ports of the front and rear photosensitive sensor circuits, pin 2 of the U6 is a PWM high voltage feedback voltage controller, the output voltage can be changed by PWM, pin 3 of the U6 is a controller of the boost circuit, and high voltage can be turned off and on, and pins 14 and 15 of the U6 are PWM output pins.
Preferably, the boost circuit is provided with an ICU2, a wire-wound inductor LE8, a diode D9, capacitors C22, C16, C14, and resistors R9, R8, R30.
Preferably, the front photosensor circuit includes a photosensor PS1, resistors R4, R65, and capacitors C7, C12, and the resistor R4 is a current limiting resistor.
Preferably, the rear photosensor circuit includes a photosensor PS2, resistors R37 and R66, and capacitors C2 and C24, and the resistor R37 is a current limiting resistor.
Preferably, the voltage regulating and controlling circuit comprises a voltage regulating integrated circuit U4 with adjustable voltage and a feedback network formed by resistors R43, R42 and R41, wherein pins 1 and 2 of the U4 are voltage input pins, pins 3 and 4 of the U4 are voltage output pins, and pin 6 of the U4 is voltage feedback pin.
Preferably, the H-bridge circuit includes a motor driving circuit U3, and pins 2 and 3 of the motor driving circuit U3 are PWM control pins, and pin 8 is loaded with a high voltage.
Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:
The dimming rearview mirror driving circuit can normally drive an automobile rearview mirror product manufactured by the liquid crystal film, can realize rapid dimming and anti-glare within 0.1-1 second, and can quickly recover to a normal state within 0.1-2 seconds, and meanwhile, the dimming rearview mirror driving circuit has the characteristics of low power consumption, environmental protection and electricity saving, so that the rearview mirror adopting the liquid crystal film can rapidly perform anti-glare and anti-glare on the automobile driving, and the intelligent and safe driving performance of the automobile are improved.
Drawings
FIG. 1 is a schematic diagram of a driving circuit of a light-adjusting rearview mirror according to the present utility model;
FIG. 2 is a circuit diagram of a boost circuit of the present utility model;
FIG. 3 is a circuit diagram of the MCU microprocessor control circuit of the present utility model;
FIG. 4 is a circuit diagram of a front photosensor circuit of the present utility model;
FIG. 5 is a circuit diagram of a post-photosensor circuit of the present utility model;
FIG. 6 is a circuit diagram of a voltage regulation delay control circuit of the present utility model;
Fig. 7 is a circuit diagram of an H-bridge circuit of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
Referring to fig. 1, the present utility model provides a driving circuit for a dimming rearview mirror, comprising:
the booster circuit is electrically connected with the power supply;
the MCU micro-processing control circuit is connected with the booster circuit,
The front photosensitive sensor circuit is used for sensing the light intensity in front of the dimming rearview mirror, converting the sensed light signal into an electric signal and transmitting the electric signal to the MCU micro-processing control circuit;
The rear photosensitive sensor circuit is used for sensing the light intensity behind the dimming rearview mirror, converting the sensed light signal into an electric signal and transmitting the electric signal to the MCU micro-processing control circuit;
The control circuit is connected with the MCU micro-processing control circuit and used for avoiding stroboscopic occurrence of a liquid crystal film on the dimming rearview mirror;
And one end of the H-bridge circuit is electrically connected with the MCU micro-processing control circuit, the other end of the H-bridge circuit is electrically connected with the liquid crystal film on the dimming rearview mirror, and the MCU micro-processing control circuit drives and controls the H-bridge circuit.
In this embodiment, the structure of the dimming rearview mirror of the automobile mainly comprises a front glass panel, a rear plastic cover, a front optical sensor, a rear optical sensor and a driving circuit board. The liquid crystal film is adhered on the front glass panel, and the liquid crystal film used in the embodiment is CCS liquid crystal film invented by Shenzhen photoelectric limited company, and the dimming rearview mirror driving circuit mainly drives and controls the CCS liquid crystal film. The MCU micro-processing control circuit mainly adopts an 8-bit processor with an 8051 kernel, wherein the H bridge circuit is driven and controlled by PWM. In addition, analog-to-digital AD conversion is carried out on the front and back photosensitive sensor circuits, and the switching of the CCS liquid crystal film is controlled in real time through a difference value calculation method. The front and back photosensitive sensor circuits adopt photodiode sensors with extremely high sensitivity, optical parameter values are obtained after analog-to-digital conversion in sequence, and liquid crystal can be controlled through a certain algorithm. The H bridge circuit can generate alternating square waves on the H bridge circuit through the PWM pulse control circuit of the MCU, and finally the alternating square waves are output to the CCS liquid crystal film, so that the purpose of driving control is achieved.
Referring to fig. 2, the MCU micro-processing control circuit includes an MCU controller U6, pins 1 and 20 of the U6 are input ports of the front and rear photosensitive sensor circuits, pin 2 of the U6 is a PWM high voltage feedback voltage controller, the output voltage can be changed by PWM, pin 3 of the U6 is a controller of the boost circuit, which can turn off and turn on the high voltage, and pins 14 and 15 of the U6 are PWM output pins. The working principle of the MCU micro-processing control circuit is as follows: u6 is MCU controller, and 1 foot and 20 feet are the input port of front and back photoelectric sensor. The 2 pin is a PWM high voltage feedback voltage controller, through which the output voltage can be changed. The 3 pin is a boost circuit controller which can turn off and on the high voltage. The 5 feet and the 8 feet are power input feet, and the 10 feet are ground feet. Pins 11 and 12 are serial port software download pins. Pins 14 and 15 are PWM output pins which are input to the H-bridge motor driven control pin to generate an alternating square wave voltage. The 16-19 pins are reserved voltage control pins.
Referring to fig. 3, the boost circuit is provided with an ICU2, a wire-wound inductor LE8, a diode D9, capacitors C22, C16, C14, and resistors R9, R8, R30. The operating principle of the booster circuit is as follows: the +5V power supply is input to pins 5 and 6 of ICU2, LE8 is a wire wound inductor, D9 is a Schottky diode, C22 and C16, C14 are input and output capacitors, feedback voltage is obtained after the voltage is divided by R9, R8 and R30, the feedback voltage is loaded to pin 3 of U2, raised voltage is obtained through inductance energy storage and diode D9 at the switching frequency of 500K-1 MHz, for example, 12Vdc, and different output voltages can be obtained by adjusting the voltage division feedback resistance.
Referring to fig. 4 and 5, the front photosensor circuit includes a photosensor PS1, resistors R4, R65, and capacitors C7, C12, and the resistor R4 is a current limiting resistor. The rear photosensitive sensor circuit comprises a photosensitive sensor PS2, resistors R37 and R66, and capacitors C2 and C24, wherein the resistor R37 is a current limiting resistor. The working principle of the front and rear photosensitive sensor circuits is as follows: the 5V regulated power supply is respectively loaded onto the front and rear photosensitive sensors PS1 and PS2 through the resistors R65 and R66, after light enters the photosensitive sensors, photocurrents are generated inside the photosensitive sensors, so that on the second leg, the photovoltages of the front and rear sensors are respectively obtained, the R4 and R37 are current limiting resistors of the photocurrents, the stronger the light is, the larger the photocurrents are, the higher the obtained voltage is, the photovoltages generated by the second leg of the photosensitive sensors PS1 and PS2 are input into the MCU microprocessor to perform analog-to-digital AD conversion, and accordingly, the front and rear light intensity values are obtained, and the opening and closing of the liquid crystal driving voltage can be controlled by calculating the front and rear light intensity difference values, for example: the CCS liquid crystal driving voltage can be turned off in daytime, and the liquid crystal driving voltage is turned on at night when the rearview mirror emits stronger light, so that the panel has lower light reflectivity, and the anti-dazzle purpose is achieved.
Referring to fig. 6, the voltage regulating and controlling circuit includes a voltage regulating integrated circuit U4 with adjustable voltage and a feedback network formed by resistors R43, R42, and R41, pins 1 and 2 of U4 are voltage input pins, pins 3 and 4 of U4 are voltage output pins, and pin 6 of U4 is voltage feedback pin. The working principle of the control circuit during calendaring is as follows: when the voltage is applied to the liquid crystal, the liquid crystal rotates, and when the voltage is increased, the difference of the rotation angles of liquid crystal molecules occurs, so that the stroboscopic dizziness occurs on the visual angle, and a time-adjusting control circuit is needed to be added. In the figure, U4 is a voltage-adjustable voltage-stabilizing integrated circuit, 1 and 2 pins are voltage input pins, 3 and 4 pins are voltage output pins, 6 th pin is a voltage feedback pin, a feedback network formed by R43, R42 and R41 can output a fixed voltage, and the fixed voltage is loaded on the feedback pin through a PWM (pulse-Width modulation) control pin of an MCU (micro-control unit) so as to delay and control the output of different voltages, for example, the output is gradually increased from low or gradually decreased from high, thereby the liquid crystal film is ideally turned on and off, and stroboscopic and glaring are avoided.
Referring to fig. 7, the H-bridge circuit includes a motor driving circuit U3, wherein pins 2 and 3 of the motor driving circuit U3 are PWM control pins, and pin 8 is loaded with a high voltage. The working principle of the H-bridge circuit is as follows: PWM1 and PWM2 are the opposite control signal input to U3's 2 nd, 3 foot, 8 th loading high voltage, sixth foot and seventh foot obtain the alternating current square wave signal of output, U3 is motor drive circuit, inside is the H bridge circuit that constitutes by 4 mosfets in fact, through the grid of control H bridge respectively, one cycle makes the one way of H bridge switch on, and another cycle makes H bridge other way switch on, and 6 feet and 7 feet in the middle are the load interface in the middle of the H bridge. Finally, an alternating square wave is obtained, and then the CCS liquid crystal film is driven to work normally.
It should be noted that, the technical solutions of the embodiments of the present utility model may be combined with each other, but it must be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the technical solutions are not combined, and are not within the scope of the claimed utility model.
The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420071394.9U CN222051305U (en) | 2024-01-11 | 2024-01-11 | A dimming rearview mirror driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420071394.9U CN222051305U (en) | 2024-01-11 | 2024-01-11 | A dimming rearview mirror driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN222051305U true CN222051305U (en) | 2024-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420071394.9U Active CN222051305U (en) | 2024-01-11 | 2024-01-11 | A dimming rearview mirror driving circuit |
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| Country | Link |
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| CN (1) | CN222051305U (en) |
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- 2024-01-11 CN CN202420071394.9U patent/CN222051305U/en active Active
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