Lens drive circuit and vehicle

Abstract

This application provides a lens driving circuit and a vehicle, belonging to the field of vehicle control technology. The lens driving circuit includes: a driving module, a processing module, an electrochromic mirror, and a light detection module; the enable terminal of the driving module is connected to the first output terminal of the processing module, the control terminal of the driving module is connected to the second output terminal of the processing module, and the output terminal of the driving module is connected to the driving terminal of the electrochromic mirror; the driving module outputs a driving voltage to the electrochromic mirror under the control of the processing module, the driving voltage being generated based on a voltage regulator element in the driving module; the acquisition terminal of the processing module is connected to the communication terminal of the light detection module; the processing module acquires the detection signal output by the light detection module, and outputs an enable signal and a control signal for adjusting the voltage level of the driving voltage to the driving module based on the detection signal. This application can improve the stability of the anti-glare function while reducing the design complexity and cost of the rearview mirror.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and more specifically, to a lens driving circuit and a vehicle. Background Technology

[0002] With the rapid development of automotive technology, in order to provide users with a better driving experience, more and more vehicles are equipped with anti-glare functions for their rearview mirrors.

[0003] In related technologies, common anti-glare rearview mirrors generally use an electrochromic mirror (ECM) as the rearview mirror and integrate a driving circuit composed of transistors into the rearview mirror to drive the ECM.

[0004] However, this approach suffers from limitations in transistor characteristics and circuit design when providing the driving voltage. Voltage fluctuations can lead to inaccurate light transmission adjustment of the ECM mirror, thus affecting the anti-glare function. Furthermore, integrating the driving circuit into the rearview mirror increases its design complexity and cost. Summary of the Invention

[0005] The purpose of this application is to provide a lens driving circuit and vehicle that can improve the stability of the anti-glare function while reducing the design complexity and cost of the rearview mirror.

[0006] The technical solution provided in this application is implemented as follows:

[0007] A first aspect of this application provides a lens driving circuit, which is applied to a vehicle. The circuit includes: a driving module, a processing module, an electrochromic lens, and a light detection module.

[0008] The enable terminal of the drive module is connected to the first output terminal of the processing module, the control terminal of the drive module is connected to the second output terminal of the processing module, and the output terminal of the drive module is connected to the drive terminal of the electrochromic mirror. The drive module is used to output a drive voltage to the electrochromic mirror under the control of the processing module, and the drive voltage is generated based on the voltage stabilizing element in the drive module.

[0009] The processing module's acquisition end is connected to the communication end of the light detection module; the processing module is used to acquire the detection signal output by the light detection module, and to output an enable signal to the driving module based on the detection signal, and to adjust the voltage level of the driving voltage using a control signal; the detection signal is generated by the light detection module based on the detected light intensity; the light detection module is used to generate the detection signal based on the detected light intensity.

[0010] The electrochromic mirror is used to adjust the operating parameters of the electrochromic mirror under the action of the driving voltage, and the operating parameters include at least color.

[0011] The drive module and the processing module are located in the vehicle's controller, and the electrochromic mirror and the light detection module are located in the vehicle's rearview mirror.

[0012] Optionally, the driving module includes: a filtering unit and a regulated output unit;

[0013] The first end of the filtering unit is connected to the second output end of the processing module, and the first end of the filtering unit is connected to the control end of the voltage regulator output unit; the filtering unit is used to convert the control signal into a DC voltage signal and output it to the voltage regulator output unit;

[0014] The power supply terminal of the voltage regulator output unit is used to input a first operating voltage. The enable terminal of the voltage regulator output unit is connected to the first output terminal of the processing module. The output terminal of the voltage regulator output unit is connected to the driving terminal of the electrochromic mirror. The voltage regulator output unit is used to output a driving voltage to the electrochromic mirror under the action of the enable signal and the DC voltage signal.

[0015] Optionally, the lens driving circuit further includes a voltage detection module;

[0016] The first end of the voltage detection module is connected to the output end of the drive module, and the second end of the voltage detection module is connected to the first input end of the processing module.

[0017] The voltage detection module is used to collect the driving voltage of the driving module to generate a first acquisition signal, and output the first acquisition signal to the processing module.

[0018] The processing module is also used to adjust the voltage level of the driving voltage when it is determined that the lens driving circuit is over-voltage based on the first acquired signal.

[0019] Optionally, the lens driving circuit further includes a current detection module;

[0020] The first end of the current detection module is connected to the output end of the driving module, the second end of the current detection module is connected to the driving end of the electrochromic mirror, and the third end of the current detection module is connected to the second input end of the processing module.

[0021] The current detection module is used to collect the driving current input to the electrochromic mirror to generate a second acquisition signal, and output the second acquisition signal to the processing module.

[0022] The processing module is also used to adjust the output of the driving module when it is determined that the lens driving circuit is overcurrent based on the second acquisition signal.

[0023] Optionally, the current detection module includes: a sampling resistor and an operational amplifier;

[0024] The first end of the sampling resistor is connected to the output end of the driving module and the positive input end of the operational amplifier, respectively; the second end of the sampling resistor is connected to the driving end of the electrochromic mirror and the negative input end of the operational amplifier, respectively.

[0025] The output terminal of the operational amplifier is connected to the second input terminal of the processing module.

[0026] Optionally, the lens driving circuit further includes a discharge module;

[0027] The first end of the discharge module is connected to the output end of the drive module, the second end of the discharge module is connected to the third output end of the processing module, and the third end of the discharge module is connected to the first output end of the processing module.

[0028] The discharge module is used to be turned on under the control of the processing module so that the electrochromic mirror can be restored to its initial state.

[0029] The processing module is also used to control the discharge module to turn on when the drive module stops outputting the drive voltage.

[0030] Optionally, the discharge module includes: a first switching transistor, a second switching transistor, a first diode, a second diode, a first resistor, and a second resistor;

[0031] The first terminal of the first switching transistor is connected to the output terminal of the driving module through the first resistor, the second terminal of the first switching transistor is grounded, the third terminal of the first switching transistor is connected to the second operating voltage through the second resistor, and the third terminal of the first switching transistor is also connected to the first terminal of the second switching transistor.

[0032] The second terminal of the second switching transistor is grounded, and the third terminal of the second switching transistor is connected to the cathode of the first diode and the cathode of the second diode, respectively.

[0033] The positive terminal of the first diode is connected to the third output terminal of the processing module, and the positive terminal of the second diode is connected to the first output terminal of the processing module.

[0034] Optionally, the lens driving circuit also includes a data acquisition module;

[0035] The first acquisition end of the acquisition module is connected to the acquisition end of the processing module, and the second acquisition end of the acquisition module is connected to the communication end of the light detection module.

[0036] The acquisition module is used to convert the voltage level of the detection signal output by the light detection module.

[0037] Optionally, the acquisition module includes a third switch, a fourth switch, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;

[0038] The first terminal of the third switch is connected to the first terminal of the third resistor and the first acquisition terminal of the processing module, the second terminal of the third switch is connected to the second terminal of the third resistor, the third terminal of the third switch is connected to the first communication terminal of the light detection module and the first terminal of the fourth resistor, and the second terminal of the third switch is also used to input a third working voltage, and the second terminal of the fourth resistor is used to input a fourth working voltage.

[0039] The first terminal of the fourth switch is connected to the first terminal of the fifth resistor and the second acquisition terminal of the processing module, the second terminal of the fourth switch is connected to the second terminal of the fifth resistor, the third terminal of the fourth switch is connected to the second communication terminal of the light detection module and the first terminal of the sixth resistor, and the second terminal of the fourth switch is also used to input the third working voltage, and the second terminal of the sixth resistor is used to input the fourth working voltage.

[0040] A second aspect of this application provides a vehicle that includes at least any of the lens driving circuits described in the first aspect.

[0041] The beneficial effects of the embodiments of this application include:

[0042] This application provides a lens driving circuit, which includes a driving module, a processing module, an electrochromic mirror, and a light detection module. Specifically, the enable terminal of the driving module is connected to the first output terminal of the processing module, the control terminal of the driving module is connected to the second output terminal of the processing module, and the output terminal of the driving module is connected to the driving terminal of the electrochromic mirror. The acquisition terminal of the processing module is connected to the communication terminal of the light detection module. Furthermore, the driving module and the processing module are housed in a controller, while the electrochromic mirror and the light detection module are integrated into a rearview mirror.

[0043] In implementing the anti-glare function based on circuitry, the driving voltage output by the driving module is generated by the voltage regulator within the module. Therefore, the stability of this driving voltage can be maximized, thereby improving the accuracy of the electrochromic mirror's adjustment of its color, light transmittance, and other operating parameters. This enhances the stability of the anti-glare function.

[0044] Furthermore, the electrochromic mirror and light detection module are housed within the rearview mirror, while the drive and processing modules are integrated into the controller. This reduces the number of components integrated into the rearview mirror, thereby lowering its design complexity and cost.

[0045] In this way, the stability of the anti-glare function can be improved while reducing the design complexity and cost of the rearview mirror. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of the first lens driving circuit provided in the embodiments of this application;

[0048] Figure 2 This is a schematic diagram of the structure of the second lens driving circuit provided in the embodiments of this application;

[0049] Figure 3 This is a schematic diagram of the structure of the third lens driving circuit provided in the embodiments of this application;

[0050] Figure 4 A schematic diagram of a first voltage timing sequence provided in an embodiment of this application;

[0051] Figure 5 A schematic diagram of a second voltage timing provided in an embodiment of this application;

[0052] Figure 6 This is a schematic diagram of the structure of the fourth lens driving circuit provided in the embodiments of this application;

[0053] Figure 7 This is a schematic diagram of the structure of the fifth lens driving circuit provided in the embodiments of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In related technologies, common anti-glare rearview mirrors typically use an ECM as the rearview mirror and integrate a drive circuit composed of transistors into the rearview mirror to drive the ECM.

[0060] However, this approach suffers from limitations in transistor characteristics and circuit design when providing the driving voltage. Voltage fluctuations can lead to inaccurate light transmission adjustment of the ECM mirror, thus affecting the anti-glare function. Furthermore, integrating the driving circuit into the rearview mirror increases its design complexity and cost.

[0061] To address this, this application provides a lens driving circuit, which includes a driving module, a processing module, an electrochromic mirror, and a light detection module. Specifically, the enable terminal of the driving module is connected to the first output terminal of the processing module, the control terminal of the driving module is connected to the second output terminal of the processing module, and the output terminal of the driving module is connected to the driving terminal of the electrochromic mirror. The driving module outputs a driving voltage to the electrochromic mirror under the control of the processing module, and this driving voltage is generated based on a voltage regulator element in the driving module. The acquisition terminal of the processing module is connected to the communication terminal of the light detection module. This design improves the stability of the anti-glare function while reducing the design complexity and cost of the rearview mirror.

[0062] This application uses a lens driving circuit applied in a vehicle as an example for illustration. However, it does not imply that this application's embodiments can only be applied to driving electrochromic lenses in vehicles.

[0063] The lens driving circuit provided in the embodiments of this application will be explained in detail below.

[0064] Figure 1 This application provides a schematic diagram of a lens driving circuit, which can be applied to a vehicle, and the vehicle can be any vehicle that may have a rearview mirror and a controller. See also... Figure 1 This application provides a lens driving circuit, which includes a driving module 101, a processing module 102, an electrochromic mirror 201, and a light detection module 202.

[0065] The enable terminal of the drive module 101 is connected to the first output terminal of the processing module 102, the control terminal of the drive module 101 is connected to the second output terminal of the processing module 102, and the output terminal of the drive module 101 is connected to the drive terminal of the electrochromic mirror 201. The acquisition terminal of the processing module 102 is connected to the communication terminal of the light detection module 202.

[0066] The driving module 101 is used to output a driving voltage to the electrochromic mirror 201 under the control of the processing module 102.

[0067] Optionally, the drive module 101 may include at least a voltage regulator, which may be a component capable of outputting a stable voltage, such as a low-dropout regulator (LDO) or any other possible component. This application embodiment does not limit this.

[0068] That is, the driving voltage is generated based on the voltage regulator in the driving module 101, so as to maximize the stability of the driving voltage output to the electrochromic mirror 201.

[0069] Optionally, the driving voltage is used to power on the electrochromic mirror 201, and different voltage levels of the driving voltage can also enable the electrochromic mirror 201 to operate with different operating parameters to adjust the anti-glare performance of the electrochromic mirror 201.

[0070] In other words, the electrochromic mirror 201 is used to adjust the operating parameters of the electrochromic mirror 201 under the action of the driving voltage.

[0071] Optionally, the operating parameters include at least color, and may also include the light transmittance of the electrochromic mirror 201.

[0072] Generally, the higher the driving voltage, the darker the color and the lower the light transmittance of the electrochromic mirror 201; conversely, the higher the driving voltage, the lighter the color and the higher the light transmittance of the electrochromic mirror 201.

[0073] Optionally, the processing module 102 can be any component with functions such as acquisition, identification, processing, calculation, and control. For example, it can be any possible component such as a microcontroller unit (MCU) or a digital signal processing chip (DSP). This application embodiment does not limit this.

[0074] The processing module 102 is used to acquire the detection signal output by the light detection module 202, and to output an enable signal and a control signal for adjusting the voltage level of the drive voltage to the drive module 101 based on the detection signal.

[0075] Optionally, the light detection module 202 may include any possible light sensor, such as an ambient light sensor (ALS) and / or a glare sensor (GLS).

[0076] Optionally, the detection signal is generated by the light detection module 202 based on the detected light intensity. That is, the detection signal can be used to indicate the light intensity detected by the light detection module 202.

[0077] As can be seen, the light detection module 202 is used to generate the detection signal based on the detected light intensity.

[0078] For example, generally speaking, if the light intensity detected by the light detection module 202 indicated by the detection signal is greater, then the voltage level of the driving voltage output by the driving module 101 needs to be adjusted to be greater (but not exceeding the rated voltage of the electrochromic mirror 201, so as to prevent damage to the electrochromic mirror 201 due to excessive driving voltage). If the light intensity detected by the light detection module 202 indicated by the detection signal is less, then the voltage level of the driving voltage output by the driving module 101 needs to be adjusted to be less, until the driving voltage is 0V (that is, the driving voltage is stopped).

[0079] Optionally, the enable signal can be used to power on the drive module 101 and operate normally; it can generally be a high-level signal.

[0080] This control signal can be used to cause the drive module 101 to adjust the voltage level of the drive voltage. Generally, this control signal can be a pulse width modulation (PWM) signal. If the control signal is a PWM signal, then the voltage level of the drive voltage can be adjusted by adjusting the duty cycle of the PWM signal.

[0081] The drive module 101 and the processing module 102 are located in the controller J of the vehicle, and the electrochromic mirror 201 and the light detection module 202 are located in the rearview mirror K of the vehicle.

[0082] Optionally, the rearview mirror K can refer to a tool installed in the aforementioned vehicle to facilitate direct acquisition of external views such as those behind, to the sides, and below the vehicle from inside the vehicle. The rearview mirror K may also include corresponding indicator lights, fasteners, and connectors, etc., but this application embodiment does not limit this.

[0083] Optionally, the controller J may be a body control module (BCM) installed in the vehicle, or any other controller installed outside the rearview mirror K in the vehicle. This application embodiment does not limit this.

[0084] It is worth noting that, in order to better explain the lens driving circuit P provided in the embodiments of this application, the working principle of circuit P is briefly introduced below:

[0085] When the power is off or there is no light, the light detection module 202 does not output the detection signal, so the processing module 102 does not output the enable signal and the control signal, and the driving module 101 does not output the driving voltage. Therefore, the electrochromic mirror 201 does not work.

[0086] When circuit P is powered on and there is light, the light detection module 202 generates and outputs the detection signal based on the detected light intensity. After the processing module 102 receives the detection signal, it analyzes and processes the detection signal, and then outputs the enable signal and the control signal to the drive module 101 based on the detection signal. Under the action of the enable signal and the control signal, the drive module 101 outputs the drive voltage to the electrochromic mirror 201.

[0087] Furthermore, if the light intensity detected by the light detection module 202 changes, the light detection module 202 adjusts the detection signal according to the real-time light intensity and outputs the adjusted detection signal to the processing module 102. The processing module 102 analyzes and processes the adjusted detection signal, and then adjusts the duty cycle of the control signal output to the drive module 101 based on the adjusted detection signal, thereby adjusting the voltage level of the drive voltage output by the drive module 101 to the electrochromic mirror 201. In this way, a real-time, dynamic anti-glare function can be achieved.

[0088] It is worth noting that, since the driving voltage output by the driving module 101 in the circuit P provided in this embodiment is generated based on the voltage stabilizing element in the driving module 101, the stability of the driving voltage can be improved as much as possible, thereby improving the accuracy of the electrochromic mirror 201 in adjusting its own color, light transmittance and other operating parameters. In this way, the stability of the anti-glare function can be improved.

[0089] Furthermore, the electrochromic mirror 201 and the light detection module 202 are housed in the rearview mirror K, while the drive module 101 and the processing module 102 are housed in the controller J. This reduces the number of components integrated into the rearview mirror K, thereby reducing the design complexity and cost of the rearview mirror K.

[0090] In this embodiment, a driving module 101, a processing module 102, an electrochromic mirror 201, and a light detection module 202 are configured in the lens driving circuit P. Specifically, the enable terminal of the driving module 101 is connected to the first output terminal of the processing module 102, the control terminal of the driving module 101 is connected to the second output terminal of the processing module 102, and the output terminal of the driving module 101 is connected to the driving terminal of the electrochromic mirror 201. The acquisition terminal of the processing module 102 is connected to the communication terminal of the light detection module 202. Furthermore, the driving module 101 and the processing module 102 are configured in the controller J, and the electrochromic mirror 201 and the light detection module 202 are configured in the rearview mirror K.

[0091] In the implementation of the anti-glare function based on circuit P, the driving voltage output by the driving module 101 is generated by the voltage regulator in the driving module 101. Therefore, the stability of the driving voltage can be improved as much as possible, thereby improving the accuracy of the electrochromic mirror 201 in adjusting its own color, light transmittance and other operating parameters. In this way, the stability of the anti-glare function can be improved.

[0092] Furthermore, the electrochromic mirror 201 and the light detection module 202 are housed in the rearview mirror K, while the drive module 101 and the processing module 102 are housed in the controller J. This reduces the number of components integrated into the rearview mirror K, thereby reducing the design complexity and cost of the rearview mirror K.

[0093] In this way, the stability of the anti-glare function can be improved while reducing the design complexity and cost of the rearview mirror.

[0094] In one possible implementation, see [link to relevant documentation]. Figure 2 The drive module 101 includes a voltage regulator output unit 1011 and a filter unit 1012.

[0095] The first end of the filter unit 1012 is connected to the second output end of the processing module 102, and the first end of the filter unit 1012 is connected to the control end of the voltage regulated output unit 1011.

[0096] The power supply terminal of the voltage regulator output unit 1011 is used to input the first working voltage. The enable terminal of the voltage regulator output unit 1011 is connected to the first output terminal of the processing module 102. The output terminal of the voltage regulator output unit 1011 is connected to the driving terminal of the electrochromic mirror 201.

[0097] Optionally, the first operating voltage can be any voltage level, for example, it can be... Figure 2 The SYS_5V voltage shown can be selected according to actual needs, and this application embodiment does not limit it.

[0098] Optionally, the filter unit 1012 may include any possible filter element, such as an RC network. Specifically, the filter unit 1012 may have only one-stage filter circuit or a two-stage filter circuit. This application embodiment does not limit this.

[0099] Optionally, if the control signal is a PWM signal, the filter unit 1012 can also be used to convert the control signal into a DC voltage signal and output it to the regulated output unit 1011. In addition, the filter unit 1012 also has the function of filtering out noise and stabilizing the circuit.

[0100] Optionally, the regulated output unit 1011 can be an LDO. The regulated output unit 1011 is used to output a drive voltage to the electrochromic mirror 201 under the action of the enable signal and the DC voltage signal.

[0101] In one possible way, see [link / reference] Figure 2 The drive module 101 may also include resistor Ra, resistor Rb, capacitor C0 and capacitor Ca.

[0102] The resistor Ra serves as a feedback loop for the voltage regulator output unit 1011. The output terminal of the voltage regulator output unit 1011 is connected to its control terminal via the resistor Ra, forming a negative feedback loop. Specifically, when the voltage output by the voltage regulator output unit 1011 is higher than a set value, the negative feedback loop reduces the internal voltage of the voltage regulator output unit 1011, thereby reducing the output driving voltage. Conversely, when the voltage output by the voltage regulator output unit 1011 is lower than the set value, the negative feedback loop increases the internal voltage of the voltage regulator output unit 1011, thereby increasing the output driving voltage. This ensures a stable output from the voltage regulator output unit 1011.

[0103] In addition, resistor Rb can be used as a current-limiting and / or voltage-dividing resistor, and capacitors C0 and Ca can be used as filter capacitors for the first operating voltage and the driving voltage, respectively, to improve the safety and stability of the circuit.

[0104] For example, the capacitance of capacitor C0 can be 2.2uF, the capacitance of capacitor Ca can be 4.7uF, the resistance of resistor Ra can be 15kΩ, and the resistance of resistor Rb can be 10kΩ. This application does not limit these values.

[0105] For example, the filter unit 1012 may include at least one resistor and at least one capacitor.

[0106] For example, see continue. Figure 2 The filter unit 1012 may include resistors Rc and Rd, and capacitors Cb and Cc, with specific connections as follows: Figure 2 As shown, the embodiments of this application will not be described in detail here.

[0107] The resistor Rc and capacitor Cb can form a first-stage filter circuit to convert the PWM signal into the DC voltage signal; the resistor Rd and capacitor Cc can form a second-stage filter circuit to further filter the DC voltage signal output from the first-stage filter circuit to remove noise in the DC voltage signal output to the drive module 101, making the DC voltage signal more stable.

[0108] For example, the capacitance values ​​of capacitors Cb and Cc can be 10nF, and the resistance values ​​of resistors Rc and Rd can be 10kΩ. This application does not limit these values.

[0109] It is worth noting that this approach maximizes the stability of the driving voltage output by the driving module 101 under the control of the DC voltage signal, thereby improving the accuracy with which the electrochromic mirror 201 adjusts its own operating parameters such as color and light transmittance. Furthermore, this enhances the stability of the anti-glare function.

[0110] To better illustrate the specific way in which the processing module 102 and the driving module 101 work together to adjust the operating parameters of the electrochromic mirror 201, a possible implementation method is provided below:

[0111] For example, see Figure 3 Assume that the voltage regulator output unit 1011 is an LDO, its power supply terminal is VIN, its enable terminal is EN, its output terminal is OUT, and its control terminal is FB. The enable signal is denoted as DO_EN, the control signal (PWM signal) as PO_PWM, the voltage at the FB terminal is VFB, and the voltage at the OUT terminal is VOUT. Furthermore, a high-level state for each signal is represented by 1, and a low-level state for each signal is represented by 0.

[0112] For example, when the light detection module 202 detects a large light intensity, assuming DO_EN = 1, PO_PWM = 1, and the VFB voltage is the default level of LDO 0.5V, the drive voltage VOUT = VFB * (1 + Ra / Rb) = 1.25V.

[0113] For example, when the light detection module 202 detects a decrease in light intensity, assuming DO_EN = 1 and PO_PWM is a 20kHz signal with a 5% duty cycle, the VFB voltage can be determined to be 0.25V (e.g., Figure 4 As shown in the figure, the driving voltage VOUT = VFB*(1+Ra / Rb) = 0.625V.

[0114] For example, when the light detection module 202 detects a further decrease in light intensity, assuming DO_EN = 1, PO_PWM is 20kHz with a duty cycle of 2%, and VFB voltage is 0.1V (e.g.... Figure 5 As shown), the EC drive output voltage VOUT = VFB*(1+R1 / R2) = 0.25V.

[0115] In this way, the processing module 102 can control the EC circuit to output voltages of different levels according to the different light intensities detected by the light detection module 202.

[0116] It is understood that the above is merely an example and does not mean that the processing module 102 in this embodiment can only control the driving module 101 to drive the electrochromic mirror 201 in this way.

[0117] In one possible implementation, see [link to previous section] Figure 3 The lens driving circuit P also includes a voltage detection module 103.

[0118] The first end of the voltage detection module 103 is connected to the output end of the drive module 101, and the second end of the voltage detection module 103 is connected to the first input end of the processing module 102.

[0119] The voltage detection module 103 is used to collect the driving voltage of the driving module 101 to generate a first acquisition signal, and output the first acquisition signal to the processing module 102.

[0120] For example, see [link to previous article] Figure 3 The voltage detection module 103 may include a resistor Re and a capacitor Cd. The resistor Re can be used as a current limiting and voltage dividing resistor, and the capacitor Cd can be used as a filter capacitor.

[0121] The resistance value of resistor Re can be 1kΩ, and the capacitance value of capacitor Cd can be 33nF. See [link to connection details] for specific connection information. Figure 3 The embodiments of this application will not be described in detail here.

[0122] Optionally, the first acquisition signal may be a voltage signal output from the second terminal of resistor Re.

[0123] Optionally, the processing module 102 is further configured to adjust the voltage level of the driving voltage when the lens driving circuit is over-voltage based on the first acquisition signal.

[0124] Specifically, the processing module 102 can compare the first acquired signal with a preset first threshold. If the voltage level of the first acquired signal is greater than the first threshold, the voltage level of the driving voltage can be reduced. If the voltage level of the first acquired signal is less than or equal to the first threshold, the driving voltage is adjusted only according to the aforementioned control signal.

[0125] In addition, if the voltage level of the first acquired signal is greater than the first threshold, the processing module 102 can continue to compare the first acquired signal with the second threshold. If the voltage level of the first acquired signal is greater than the second threshold, the driving module 101 is directly controlled to stop outputting the driving voltage, so as to prevent the electrochromic mirror 201 and / or other components in the circuit P from being damaged due to the excessive driving voltage.

[0126] This improves the safety of circuit P.

[0127] In one possible implementation, see [link to previous section] Figure 3 The lens driving circuit P also includes a current detection module 104.

[0128] The first end of the current detection module 104 is connected to the output end of the drive module 101, the second end of the current detection module 104 is connected to the drive end of the electrochromic mirror 201, and the third end of the current detection module 104 is connected to the second input end of the processing module 102.

[0129] The current detection module 104 is used to collect the driving current of the input electrochromic mirror 201 to generate a second acquisition signal, and output the second acquisition signal to the processing module 102.

[0130] The processing module 102 is also used to adjust the output of the driving module 101 when it is determined that the lens driving circuit is overcurrent based on the second acquisition signal.

[0131] Optionally, the driving current may refer to the current flowing from the output terminal of the driving module 101 to the driving terminal of the electrochromic mirror 201, that is, the current flowing through the current detection module 104.

[0132] The second acquisition signal can be a DC voltage signal generated based on the driving current, but this application embodiment does not limit this.

[0133] Specifically, the processing module 102 can compare the second acquired signal with a preset third threshold. If the voltage level of the second acquired signal is greater than the third threshold, the voltage level of the driving voltage can be reduced. If the voltage level of the second acquired signal is less than or equal to the third threshold, the driving voltage is adjusted only according to the control signal.

[0134] In addition, if the voltage level of the second acquisition signal is greater than the third threshold, the processing module 102 can continue to compare the second acquisition signal with the fourth threshold. If the voltage level of the second acquisition signal is greater than the fourth threshold, the driving module 101 is directly controlled to stop outputting the driving voltage, so as to prevent the electrochromic mirror 201 and / or other components in the circuit P from being damaged due to the excessive driving voltage.

[0135] This improves the safety of circuit P.

[0136] In one possible implementation, see [link to relevant documentation]. Figure 3 The current detection module 104 includes: a sampling resistor Rs and an operational amplifier A.

[0137] The first end of the sampling resistor Rs is connected to the output terminal of the driving module 101 and the non-inverting input terminal of the operational amplifier A, respectively. The second end of the sampling resistor Rs is connected to the driving terminal of the electrochromic mirror 201 and the non-inverting input terminal of the operational amplifier A, respectively.

[0138] The output of operational amplifier A is connected to the second input of processing module 102.

[0139] Optionally, the sampling resistor Rs can be any possible high-precision sampling resistor. A resistor with a resistance of 0.1Ω and a rated power of 1 / 8W can be selected as the sampling resistor Rs. This application embodiment does not limit this.

[0140] For example, the current detection module 104 may also include resistors Rf, Rg, and Rh, and capacitor Ce. The resistance values ​​of resistors Rf and Rg can be 10Ω, the resistance value of resistor Rh can be 1kΩ, and the capacitance value of capacitor Ce can be 33nF.

[0141] Among them, resistors Rf and Rg can be used as current-limiting resistors to protect the input terminals of operational amplifier A from damage. Resistors Rf and Rg can also be used to eliminate common-mode interference of operational amplifier A.

[0142] Resistor Rh and capacitor Ce can be used as a primary filter circuit to filter out noise in the second acquisition signal output by operational amplifier A, thereby improving the stability and reliability of current detection.

[0143] This allows for accurate acquisition of the second signal, thereby improving the safety of circuit P.

[0144] In one possible implementation, see [link to relevant documentation]. Figure 6 The lens driving circuit also includes a discharge module 105.

[0145] The first end of the discharge module 105 is connected to the output end of the drive module 101, the second end of the discharge module 105 is connected to the third output end of the processing module 102, and the third end of the discharge module 105 is connected to the first output end of the processing module 102.

[0146] The discharge module 105 is used to be turned on under the control of the processing module 102 so that the electrochromic mirror 201 returns to its initial state.

[0147] Optionally, the discharge module 105 may include any possible controllable switch, and when the processing module 102 controls the discharge module 105 and / or the controllable switch to be turned on, each capacitor in the circuit P can be discharged through the discharge module 105 and / or the controllable switch.

[0148] The initial state can refer to the state where no voltage is applied to the driving terminal of the electrochromic mirror 201 after all capacitors in circuit P have discharged, that is, the electrochromic mirror 201 is in a dormant or power-off state.

[0149] It is understood that the completion of discharge of each capacitor can mean that each capacitor has completely released the charge stored inside, or it can mean that each capacitor has released the charge stored inside to the minimum threshold. This application does not limit this.

[0150] Optionally, the processing module 102 is also used to control the discharge module 105 to turn on when the drive module 101 stops outputting the drive voltage.

[0151] In other words, the processing module 102 will only control the discharge module 105 to turn on when the processing module 102 stops outputting the above-mentioned enable signal to the drive module 101.

[0152] In one possible implementation, see [link to previous section] Figure 6 The discharge module 105 includes: a first switch Q1, a second switch Q2, a first diode D1, a second diode D2, a first resistor R1, and a second resistor R2.

[0153] The first terminal of the first switching transistor Q1 is connected to the output terminal of the drive module 101 through the first resistor R1. The second terminal of the first switching transistor Q1 is grounded. The third terminal of the first switching transistor Q1 is connected to the second operating voltage through the second resistor R2. The third terminal of the first switching transistor Q1 is also connected to the first terminal of the second switching transistor Q2.

[0154] The second terminal of the second switch Q2 is grounded, and the third terminal of the second switch Q2 is connected to the negative terminal of the first diode D1 and the negative terminal of the second diode D2, respectively.

[0155] The positive terminal of the first diode D1 is connected to the third output terminal of the processing module 102, and the positive terminal of the second diode D2 is connected to the first output terminal of the processing module 102.

[0156] Optionally, the first switch Q1 and the second switch Q2 can be N-channel switches, such as NMOS transistors.

[0157] Optionally, the first resistor R1 can be a 24Ω resistor, specifically used as a current-limiting resistor. The second resistor R2 can be a 10KΩ resistor, specifically used as a pull-up resistor.

[0158] Optionally, the second operating voltage can be any level of voltage, and it can be the same as or different from the first operating voltage. For example, the second operating voltage can be... Figure 6 The SYS_5V shown is shown.

[0159] It is understandable that the positive terminal of the first diode D1 is used to input the corresponding switching signal, which is either a high-level signal or a low-level signal, that is... Figure 6 The DO_DIS signal is shown in the diagram. The positive terminal of the second diode D2 is used to input the aforementioned enable signal, that is... Figure 6 The DO_EN signal is shown in the image.

[0160] Specifically, when the processing module 102 outputs the enable signal to the drive module 101 to control the drive module 101 to power on, the enable signal is also input to the second switch Q2 through the second diode D2. At this time, the second switch Q2 is turned on, and the voltage of the third terminal of the first switch Q1 is grounded through the second switch Q2, and the voltage is pulled low, so the first switch Q1 is turned off. Under these circumstances, the discharge module 105 is turned off, and the electrochromic mirror 201 and the capacitors in the circuit P cannot discharge, so the electrochromic mirror 201 continues to work normally.

[0161] When the processing module 102 stops outputting the enable signal to the drive module 101 and the drive module 101 powers down to sleep, it stops inputting the enable signal to the second switch Q2 through the second diode D2. At this time, the processing module 102 inputs a low-level switch signal through the first diode D1. The second switch Q2 is turned off, and the voltage at the third terminal of the first switch Q1 is pulled high by the second operating voltage, turning on the first switch Q1. In this situation, the discharge module 105 is turned on, and the electrochromic mirror 201 and the capacitors in the circuit P can be discharged through the discharge module 105 (specifically through the first switch Q1 and resistor R1), and the electrochromic mirror 201 returns to its initial state.

[0162] When the processing module 102 stops outputting the enable signal to the drive module 101 and the drive module 101 powers down and enters sleep mode, it stops inputting the enable signal to the second switch Q2 through the second diode D2. At this time, the processing module 102 inputs a high-level switching signal through the first diode D1. The second switch Q2 then conducts, and the voltage at the third terminal of the first switch Q1 is grounded through the second switch Q2, pulling the voltage down and turning off the first switch Q1. In this situation, the discharge module 105 is turned off, and the electrochromic mirror 201 and the capacitors in circuit P cannot discharge.

[0163] In addition, the processing module 102 can also control the conduction level of the switching transistor by controlling the level of the DO_DIS signal, thereby controlling the discharge time and discharge speed.

[0164] In this way, the processing module 102 can control the discharge module 105 to conduct when the drive module 101 is powered down and in sleep mode, thereby restoring the electrochromic mirror 201 to its initial state. Simultaneously, it can prevent the discharge module 105 from conducting when the drive module 101 is powered on due to the processing module 102 mistakenly outputting a DO_DIS signal, thus improving the practicality and reliability of circuit P.

[0165] In one possible implementation, see [link to relevant documentation]. Figure 7 The lens driving circuit P also includes a data acquisition module 106.

[0166] The first acquisition end of the acquisition module 106 is connected to the acquisition end of the processing module 102, and the second acquisition end of the acquisition module 106 is connected to the communication end of the light detection module 202.

[0167] The acquisition module 106 is used to convert the voltage level of the detection signal output by the light detection module 202.

[0168] Specifically, see [link to relevant documentation] Figure 7 The acquisition module 106 includes a third switch Q3, a fourth switch Q4, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.

[0169] The first terminal of the third switch Q3 is connected to the first terminal of the third resistor R3 and the first acquisition terminal of the processing module 102, respectively. The second terminal of the third switch Q3 is connected to the second terminal of the third resistor R3. The third terminal of the third switch Q3 is connected to the first communication terminal of the light detection module 202 and the first terminal of the fourth resistor R4, respectively. The second terminal of the third switch Q3 is also used to input the third working voltage, and the second terminal of the fourth resistor R4 is used to input the fourth working voltage.

[0170] The first terminal of the fourth switch Q4 is connected to the first terminal of the fifth resistor R5 and the second acquisition terminal of the processing module 102, respectively. The second terminal of the fourth switch Q4 is connected to the second terminal of the fifth resistor R5. The third terminal of the fourth switch Q4 is connected to the second communication terminal of the light detection module 202 and the first terminal of the sixth resistor R6, respectively. The second terminal of the fourth switch Q4 is also used to input the third working voltage, and the second terminal of the sixth resistor R6 is used to input the fourth working voltage.

[0171] Optionally, both the third switch Q3 and the fourth switch Q4 can be N-channel switches, such as NMOS transistors.

[0172] Optionally, the third working voltage and the fourth working voltage can be any possible voltage level. Generally, the voltage level of the third working voltage is lower than the pressure level of the fourth working voltage.

[0173] For example, see continue. Figure 7 The third operating voltage can be as follows: Figure 7 As shown in SYS_5V, this fourth operating voltage can be as follows: Figure 7 The VBAT_12V shown is shown.

[0174] Specifically, the detection signal output by the light detection module 202 can be collected based on 12V I2C communication to improve the signal driving ability and anti-interference ability. When the acquisition signals I2C_SCL and I2C_SDA output by the processing module 102 are at low levels, VGS of the third switching transistor Q3 and the fourth switching transistor Q4 is greater than VGS(th), and the third switching transistor Q3 and the fourth switching transistor Q4 are turned on. At this time, the ports CON_SCL and CON_SDA of the processing module 102 used to connect the light detection module 202 output a low level of 0V.

[0175] However, when the acquisition signals I2C_SCL and I2C_SDA are at high levels, VGS of the third switching transistor Q3 and the fourth switching transistor Q4 is less than VGS(th), the third switching transistor Q3 and the fourth switching transistor Q4 are not turned on, and the ports CON_SCL and CON_SDA output a high level of 12V. In this case, the I2C signal transmitted between the light detection module 202 and the processing module 102 can be converted from 5V to 12V.

[0176] In this way, communication can be performed between the light detection module 202 and the processing module 102 based on the 12V I2C signal to improve the signal driving ability and anti-interference ability.

[0177] In a possible way, continue to refer to Figure 7 , the circuit P may further include a third diode D3. The first end of the third diode D3 is connected to the driving end of the electrochromic mirror 201, and the second end of the third diode D3 is grounded.

[0178] Optionally, the third diode D3 may be a Transient Voltage Suppressor (TVS) to achieve the function of electrostatic protection.

[0179] In a possible way, the above voltage detection module 103, current detection module 104, discharge module 105, and acquisition module 106 can all be arranged in the controller J, and components such as the third diode D3 and the capacitor C0 can also be arranged in the controller J.

[0180] To better illustrate the functions and roles of the above voltage detection module 103, current detection module 104, and discharge module 105 in the lens driving circuit P, a possible implementation method is provided below:

[0181] For example, when the driving voltage VOUT output by the driving module 101 is greater than 1.25V, the first acquisition signal VAI_EC_V output by the voltage detection module 103 to the first input terminal of the processing module 102 is greater than 1.25V. At this time, the processing module 102 can switch the enable signal DO_EN and the control signal PO_PWM to low level and switch the switch signal DO_DIS to high level. In this way, the driving of the electrochromic mirror 201 can be stopped, and the discharge module 105 can be turned on to discharge the electrochromic mirror 201.

[0182] For example, when the driving current IOUT of the electrochromic mirror 201 is greater than 300mA, the second acquisition signal VAI_EC_CUR = G * IOUT * Rs = 1.5V (where G is the amplification factor of operational amplifier A, assuming G = 50V / V and Rs = 0.1Ω). Therefore, when the second input terminal of the processing module 102 acquires VAI_EC_CUR > 1.5V, it can switch the enable signal DO_EN and the control signal PO_PWM to low level and the switch signal DO_DIS to high level. In this way, the driving of the electrochromic mirror 201 can be stopped, and the discharge module 105 can be turned on to discharge the electrochromic mirror 201.

[0183] In this way, the driving of the electrochromic mirror 201 can be stopped in the event of overvoltage or overcurrent in circuit P, thus protecting the components in circuit P from damage.

[0184] For example, when the electrochromic mirror 201 needs to be powered down and go into sleep mode, the processing module 102 stops outputting the enable signal DO_EN, or switches the enable signal DO_EN to a low level.

[0185] When the switch signal DO_DIS output by the processing module 102 is low, the second switch Q2 is not turned on, the third terminal of the first switch Q1 is pulled high by the second working voltage, the first switch Q1 is turned on, and the electrochromic mirror 201 discharges through the resistor R1 and the first switch Q1.

[0186] When the switch signal DO_DIS is high, the second switch Q2 is turned on, the third terminal of the first switch Q1 is grounded through the second switch Q2 and pulled low, the first switch Q1 is not turned on, and the electrochromic mirror 201 stops discharging.

[0187] The following describes vehicles including those using the lens drive circuit provided in this application. The specific implementation process and technical effects are described above and will not be repeated here.

[0188] This application also provides a vehicle that includes at least the lens driving circuit P provided in any of the above embodiments.

[0189] Optionally, the vehicle may also include any possible devices such as a battery, display unit, chassis, drive shaft, engine, and electric motor. This application does not limit this aspect.

[0190] The vehicle described above includes any of the lens driving circuits P provided in the foregoing embodiments. The vehicle and the lens driving circuit P belong to the same inventive concept, and their implementation principles and technical effects are similar, so they will not be described again here.

[0191] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0192] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens driving circuit, characterized by, The lens driving circuit is applied to a vehicle, and the circuit includes: a driving module, a processing module, an electrochromic lens, and a light detection module; The enable terminal of the drive module is connected to the first output terminal of the processing module, the control terminal of the drive module is connected to the second output terminal of the processing module, and the output terminal of the drive module is connected to the drive terminal of the electrochromic mirror. The drive module is used to output a drive voltage to the electrochromic mirror under the control of the processing module, and the drive voltage is generated based on the voltage stabilizing element in the drive module. The processing module's acquisition end is connected to the communication end of the light detection module; the processing module is used to acquire the detection signal output by the light detection module, and to output an enable signal to the driving module based on the detection signal, and to adjust the voltage level of the driving voltage using a control signal; the detection signal is generated by the light detection module based on the detected light intensity; the light detection module is used to generate the detection signal based on the detected light intensity. The electrochromic mirror is used to adjust the operating parameters of the electrochromic mirror under the action of the driving voltage, and the operating parameters include at least color. The drive module and the processing module are located in the vehicle's controller, and the electrochromic mirror and the light detection module are located in the vehicle's rearview mirror.

2. The lens driving circuit according to claim 1, wherein The driving module includes: a filtering unit and a voltage regulated output unit; The first end of the filtering unit is connected to the second output end of the processing module, and the first end of the filtering unit is connected to the control end of the voltage regulator output unit; the filtering unit is used to convert the control signal into a DC voltage signal and output it to the voltage regulator output unit; The power supply terminal of the voltage regulator output unit is used to input a first operating voltage. The enable terminal of the voltage regulator output unit is connected to the first output terminal of the processing module. The output terminal of the voltage regulator output unit is connected to the driving terminal of the electrochromic mirror. The voltage regulator output unit is used to output a driving voltage to the electrochromic mirror under the action of the enable signal and the DC voltage signal.

3. The lens driving circuit according to claim 1, wherein The lens driving circuit also includes a voltage detection module; The first end of the voltage detection module is connected to the output end of the drive module, and the second end of the voltage detection module is connected to the first input end of the processing module. The voltage detection module is used to collect the driving voltage of the driving module to generate a first acquisition signal, and output the first acquisition signal to the processing module. The processing module is also used to adjust the voltage level of the driving voltage when it is determined that the lens driving circuit is over-voltage based on the first acquired signal.

4. The lens driving circuit as described in claim 1, characterized in that, The lens driving circuit also includes a current detection module; The first end of the current detection module is connected to the output end of the driving module, the second end of the current detection module is connected to the driving end of the electrochromic mirror, and the third end of the current detection module is connected to the second input end of the processing module. The current detection module is used to collect the driving current input to the electrochromic mirror to generate a second acquisition signal, and output the second acquisition signal to the processing module. The processing module is also used to adjust the output of the driving module when it is determined that the lens driving circuit is overcurrent based on the second acquisition signal.

5. The lens driving circuit as described in claim 4, characterized in that, The current detection module includes: a sampling resistor and an operational amplifier; The first end of the sampling resistor is connected to the output end of the driving module and the positive input end of the operational amplifier, respectively; the second end of the sampling resistor is connected to the driving end of the electrochromic mirror and the negative input end of the operational amplifier, respectively. The output terminal of the operational amplifier is connected to the second input terminal of the processing module.

6. The lens driving circuit as described in claim 1, characterized in that, The lens driving circuit also includes a discharge module; The first end of the discharge module is connected to the output end of the drive module, the second end of the discharge module is connected to the third output end of the processing module, and the third end of the discharge module is connected to the first output end of the processing module. The discharge module is used to be turned on under the control of the processing module so that the electrochromic mirror can be restored to its initial state. The processing module is also used to control the discharge module to turn on when the drive module stops outputting the drive voltage.

7. The lens driving circuit as described in claim 6, characterized in that, The discharge module includes: a first switching transistor, a second switching transistor, a first diode, a second diode, a first resistor, and a second resistor; The first terminal of the first switching transistor is connected to the output terminal of the driving module through the first resistor, the second terminal of the first switching transistor is grounded, the third terminal of the first switching transistor is connected to the second operating voltage through the second resistor, and the third terminal of the first switching transistor is also connected to the first terminal of the second switching transistor. The second terminal of the second switching transistor is grounded, and the third terminal of the second switching transistor is connected to the cathode of the first diode and the cathode of the second diode, respectively. The positive terminal of the first diode is connected to the third output terminal of the processing module, and the positive terminal of the second diode is connected to the first output terminal of the processing module.

8. The lens driving circuit as described in claim 1, characterized in that, The lens driving circuit also includes a data acquisition module; The first acquisition end of the acquisition module is connected to the acquisition end of the processing module, and the second acquisition end of the acquisition module is connected to the communication end of the light detection module. The acquisition module is used to convert the voltage level of the detection signal output by the light detection module.

9. The lens driving circuit as described in claim 8, characterized in that, The acquisition module includes a third switch, a fourth switch, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; The first terminal of the third switch is connected to the first terminal of the third resistor and the first acquisition terminal of the processing module, the second terminal of the third switch is connected to the second terminal of the third resistor, the third terminal of the third switch is connected to the first communication terminal of the light detection module and the first terminal of the fourth resistor, and the second terminal of the third switch is also used to input a third working voltage, and the second terminal of the fourth resistor is used to input a fourth working voltage. The first terminal of the fourth switch is connected to the first terminal of the fifth resistor and the second acquisition terminal of the processing module, the second terminal of the fourth switch is connected to the second terminal of the fifth resistor, the third terminal of the fourth switch is connected to the second communication terminal of the light detection module and the first terminal of the sixth resistor, and the second terminal of the fourth switch is also used to input the third working voltage, and the second terminal of the sixth resistor is used to input the fourth working voltage.

10. A vehicle, characterized in that, The vehicle includes at least the lens driving circuit as described in any one of claims 1 to 9.

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