Control circuit of color-changing filter and electrically controlled color-changing filter

Abstract

The utility model discloses a control circuit of a color-changing filter and an electrically controlled color-changing filter, wherein the power supply circuit of the control circuit of the color-changing filter is used to provide a working voltage; the communication circuit is used to communicate with a signal generating device; the driving circuit is electrically connected to the power supply circuit, and the driving circuit is used to adjust the working voltage output by the power supply circuit to a target voltage, and output the target voltage to the color-changing filter; the main control chip is electrically connected to the communication circuit and the driving circuit respectively, and the main control chip obtains the signal generated by the signal generating device through the communication circuit, and outputs a corresponding adjustment signal to the driving circuit based on the signal to adjust the output frequency of the target voltage. In this way, the light transmittance of the color-changing filter can be accurately controlled to meet the needs under different light conditions and avoid the vibration and noise problems caused by traditional mechanical methods.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a control circuit of a color-changing filter and an electrically controlled color-changing filter. Background Art

[0002] A variable neutral density (VND) filter is an optical element that can adjust the amount of light entering the lens by changing the transmittance. Traditional VND filters are usually used in photography and videography to achieve different exposure effects by adjusting the intensity of light.

[0003] The VND filter products of the related art usually use a mechanical drive (motor, or gears) to rotate the lens to achieve the change of the neutral density (ND) value.

[0004] However, this method has obvious defects in practical application. The mechanical rotation method is prone to vibration and noise during operation, which affects the stability of shooting and the requirements of a quiet environment. Utility Model Content

[0005] The main purpose of the utility model is to provide a control circuit for a color-changing filter, aiming to solve the problem that vibration and noise are easily generated during the operation of the existing VND filter.

[0006] To achieve the above object, the utility model provides a control circuit for a color-changing filter, the control circuit for the color-changing filter comprising:

[0007] A power supply circuit, wherein the power supply circuit is used to provide an operating voltage;

[0008] A communication circuit, the communication circuit is used to communicate with the signal generating device;

[0009] A main control chip, the main control chip is electrically connected to the communication circuit, and the main control chip is used to obtain the signal generated by the signal generating device through the communication circuit, and output a corresponding adjustment signal based on the signal;

[0010] A driving circuit, wherein the driving circuit is electrically connected to the power supply circuit and the main control chip, and is used to adjust the operating voltage output by the power supply circuit to a target voltage, and adjust the output frequency of the target voltage based on an adjustment signal output from the main control chip, so as to output the target voltage after adjusting the output frequency to the color-changing filter.

[0011] In some embodiments, the driving circuit includes:

[0012] a voltage control circuit, electrically connected to the power supply circuit, and configured to step up or step down the operating voltage to obtain the target voltage;

[0013] a voltage doubling rectifier circuit, electrically connected to the voltage control circuit, the voltage doubling rectifier circuit being used to double the voltage of the drive signal output by the voltage control circuit;

[0014] The push-pull circuit is electrically connected to the main control chip and the voltage doubler rectifier circuit respectively, and the push-pull circuit is used to adjust the output frequency of the target voltage under the control of the main control chip.

[0015] In some embodiments, the main control chip includes a first communication terminal;

[0016] The voltage control circuit comprises:

[0017] A voltage control chip, wherein a power supply end of the voltage control chip is electrically connected to the power supply circuit, an output end of the voltage control chip is electrically connected to an input end of the push-pull circuit, a first control end of the voltage control chip is electrically connected to an input end of the voltage doubler rectifier circuit, and a second communication end of the voltage control chip is communicatively connected to a first communication end of the main control chip;

[0018] Among them, the voltage control chip obtains the adjustment signal transmitted by the second communication end through the first communication end, converts the working voltage of the power supply circuit into a rated voltage based on the adjustment signal, outputs it to the push-pull circuit, and simultaneously outputs a control signal from the first control end to the voltage doubler rectifier circuit.

[0019] In some embodiments, the main control chip includes a second control terminal;

[0020] The push-pull circuit comprises:

[0021] a first switch tube, wherein the source of the first switch tube is electrically connected to the output end of the voltage control chip, the gate of the first switch tube is electrically connected to the output end of the voltage doubler rectifier circuit, and the source of the first switch tube is electrically connected to the positive electrode of the color-changing filter;

[0022] a second switch tube, wherein a drain of the second switch tube is electrically connected to a gate of the first switch tube, a source of the second switch tube is grounded, and a gate of the second switch tube is electrically connected to a second control terminal of the main control chip;

[0023] The main control chip outputs a corresponding regulating signal to the gate of the second switch tube through the second control terminal, so as to control the second switch tube to lower the level of the gate of the first switch tube when the second switch tube is turned on.

[0024] In some embodiments, the push-pull circuit further comprises:

[0025] A third switch tube, wherein the drain of the third switch tube is electrically connected to the source of the first switch tube, the source of the third switch tube is grounded, the gate of the third switch tube is electrically connected to the second control terminal of the main control chip, and the third switch tube is used to release the electrical energy between the first switch tube and the positive electrode of the color-changing filter when it is turned on.

[0026] In some embodiments, the voltage doubler rectifier circuit includes:

[0027] Two first diodes, wherein anodes of the two first diodes are electrically connected to the first control terminal of the voltage control chip, and cathodes of the two first diodes are electrically connected to the gate of the first switch tube;

[0028] Two second diodes, anodes of the two second diodes are electrically connected to the output end of the voltage control chip, and cathodes of the two second diodes are electrically connected to the cathodes of the two first diodes respectively.

[0029] In some embodiments, the voltage doubler rectifier circuit further includes an inductor, and the inductor is electrically connected between the anodes of the two first diodes.

[0030] In some embodiments, the main control chip includes a fourth communication terminal;

[0031] The communication circuit comprises:

[0032] A wireless communication circuit, wherein the signal receiving end of the wireless communication circuit is used to connect to an antenna to wirelessly communicate with the signal generating device, and the third communication end of the wireless communication circuit is connected to the fourth communication end of the main control chip.

[0033] In some embodiments, the communication circuit further includes a wired communication circuit, which is used to be electrically connected to a coding switch, and to generate a signal and transmit it to the main control chip when the coding switch is turned.

[0034] The utility model further proposes an electrically controlled color-changing filter, comprising:

[0035] A bracket, wherein the bracket is formed with a light-transmitting window;

[0036] A color-changing filter, wherein the color-changing glass is installed in the light-transmitting window;

[0037] As well as the control circuit of the aforementioned color-changing filter, the control circuit of the color-changing filter is also installed inside the bracket.

[0038] The beneficial effect of the technical solution of the utility model is that the main control chip communicates with the signal generating device through the communication circuit to obtain the signal generated by the signal generating device, and outputs the corresponding adjustment signal to the driving circuit based on the signal obtained from the signal generating device. After receiving the adjustment signal, the driving circuit adjusts the amplitude of the working voltage input by the power supply circuit to output the target voltage. At the same time, the adjustment signal of the main control chip also controls the frequency of the target voltage output by the driving circuit. The driving circuit outputs the target voltage after adjusting the output frequency to the color-changing filter to achieve control of the transmittance of the color-changing filter. Since the transmittance of the color-changing filter is adjusted by circuit, there will be no vibration and noise problems caused by mechanical control. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a module electrical connection diagram of a control circuit of a color-changing filter in one embodiment of the utility model;

[0040] Figure 2 A circuit diagram of a control circuit of a color-changing filter in one embodiment of the utility model;

[0041] Figure 3 This is a circuit diagram of a main control chip according to an embodiment of the utility model;

[0042] Figure 4 A circuit diagram of a wireless communication circuit in one embodiment of the utility model;

[0043] Figure 5 4 is a circuit diagram of a wireless communication circuit in one embodiment of the present utility model.

[0044] Description of Figure Numbers:

[0045] 100, power supply circuit; 200, communication circuit; 202, wireless communication circuit; BT3, third communication terminal; 204, wired communication circuit; 300, drive circuit; 302, voltage control circuit; U16, voltage control chip; 304, power supply terminal of voltage control chip; 306, output terminal of voltage control chip; SW1, first control terminal; SC2, second communication terminal; 310, voltage doubler rectifier circuit; 312, input terminal of voltage doubler rectifier circuit; D1, two first diodes; D2, two second diodes; L6, inductor; 320, push-pull circuit 320; 322, input terminal of push-pull circuit; Q1, first switch tube; Q2, second switch tube; Q3, third switch tube; 400, main control chip; SC1, first communication terminal; 404, second control terminal; BT4, fourth communication terminal; 500, bracket; 502, light-transmitting window; 504, photochromic glass.

[0046] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0050] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0051] To facilitate understanding of the following embodiments, the relevant technologies involved in the color-changing filter are first described. The color-changing filter mentioned in this embodiment uses electrochromic glass, and its color-changing principle is based on the electrochromic effect. Specifically, when a voltage is applied, the ions and electrons in the electrochromic material move, causing the color of the glass to change. This type of glass can remain transparent in the absence of voltage and turn dark after voltage is applied (or it can remain dark in the absence of voltage and turn transparent after voltage is applied), thereby adjusting the amount of light passing through. Therefore, based on this characteristic of electrochromic glass, it is applied to the filter, and the transmittance can be controlled by adjusting the voltage, thereby achieving precise exposure control. For specific control circuits, please refer to Figure 1 and Figure 2 , Figure 1 This is a module electrical connection diagram of a control circuit of a color-changing filter in one embodiment of the utility model. Figure 2 4 is a circuit diagram of a control circuit of a color-changing filter in one embodiment of the utility model.

[0052] The present invention provides a control circuit for a color-changing filter. The control circuit for the color-changing filter includes:

[0053] A power supply circuit 100, the power supply circuit 100 is used to provide a working voltage;

[0054] A communication circuit 200, the communication circuit 200 is used to communicate with a signal generating device;

[0055] A main control chip 400, the main control chip 400 is electrically connected to the communication circuit 200, and the main control chip 400 is used to obtain the signal generated by the signal generating device through the communication circuit 200, and output a corresponding adjustment signal based on the signal;

[0056] The driving circuit 300 is electrically connected to the power supply circuit 100 and the main control chip 400. The driving circuit 300 is used to adjust the operating voltage output by the power supply circuit 100 to the target voltage, and adjust the output frequency of the target voltage based on the adjustment signal output from the main control chip 400, so as to output the target voltage after adjusting the output frequency to the color-changing filter.

[0057] In this embodiment, the power supply circuit 100 is mainly used to provide a working voltage. The power supply circuit 100 can be a portable power supply, such as a mobile power supply or a mounted battery, to provide a stable DC power supply.

[0058] The communication circuit 200 is mainly used to communicate with the signal generating device (the signal generating device referred to in this embodiment can be a host computer, a hand-cranked wheel remote control, and a coding switch). Among them, the communication circuit 200 can use wireless communication (such as Wi-Fi, Bluetooth) or wired communication (such as RS-232, USB) to achieve reliable transmission of signals. It should be noted that in addition to serving as the main control chip 400 to communicate with the signal generating device, the communication circuit 200 in this embodiment can also be used for system upgrades in some embodiments to update the system firmware by receiving and sending upgrade instructions.

[0059] In this embodiment, the driving circuit 300 is connected to the power supply circuit 100, adjusts the working voltage to the target voltage, and outputs it to the color-changing filter. The driving circuit 300 can use a PWM control circuit, a linear regulator, etc. to achieve precise voltage control.

[0060] The main control chip 400 is connected to the communication circuit 200 and the driving circuit 300 respectively. The main control chip 400 mainly receives signals from the signal generating device through the communication circuit 200. These signals usually contain the transmittance adjustment information required by the user or the system, and output the corresponding adjustment signal to the driving circuit 300 based on the signal to adjust the output frequency of the target voltage. In addition, the main control chip 400 can also be responsible for the management and monitoring of the entire system to ensure that each part works normally, such as detecting system failures, handling errors, and making adjustments as needed.

[0061] In different application scenarios, the main control chip 400 can adopt a variety of replacement schemes and devices such as microcontrollers (MCU), specifically, Arduino, Raspberry Pi, ESP32, etc. These microcontrollers have rich I / O interfaces and powerful processing capabilities, suitable for applications that require high flexibility and easy programming. Of course, it can also be a dedicated integrated circuit (ASIC), which is specially designed for specific applications and has the advantages of high efficiency and high performance, suitable for large-scale production and application scenarios requiring fixed functions.

[0062] By selecting the appropriate main control chip 400, the color filter system can achieve the best performance and user experience in different application scenarios. Different types of main control chips 400 provide a balance of flexibility, performance and stability for system design, ensuring that the system meets various needs.

[0063] In this embodiment, the various parts work together to achieve precise control of the color-changing filter. First, the power supply circuit 100 provides a stable operating voltage for the entire system. The main control chip 400 communicates with the signal generating device through the communication circuit 200 to obtain the required transmittance adjustment information. When the signal generating device generates a control signal, the communication circuit 200 transmits the signal to the main control chip 400, and the main control chip 400 parses the signal; the signal of the signal generating device can be a customized voltage parameter corresponding to the main control chip 400 (for example, these signals can be 0-10 gears), and the main control chip 400 can pre-set multiple groups of adjustment voltage parameters such as 0-10V, and the customized controllable adjustment level is 0 to 2048 levels, that is, the signal 0-10 of the signal generating device corresponds to the voltage parameter 0-10V.

[0064] During the adjustment process, the user can operate the gear of the signal generating device, for example, the 5th gear, then the corresponding voltage parameter is 5V, and the corresponding adjustment level is 1024 levels. After receiving these parameters, the driving circuit 300 parses the required voltage value and adjustment level. And according to the analysis result, the voltage amplitude is adjusted, and the voltage is boosted or bucked to output the required target voltage. For example, if the voltage input to the driving circuit 300 by the power supply circuit 100 is 3.3V, and the MCU sets the output voltage parameter to 5V, then the driving circuit 300 will perform a boost operation to output 5V.

[0065] The relationship between the adjustment levels of 0 to 2048 and the voltage of 0-10V can be understood by dividing the voltage range into multiple equally divided voltage steps. They are related by each level corresponding to a small voltage increment. In layman's terms, the voltage range of 0-10V is divided into 2048 small voltage "steps", and the height of each step is an adjustment level.

[0066] For example: if the adjustment is to level 0, the output voltage is 0 V. If the adjustment is to level 2048, the output voltage is 10 V. If the adjustment is to level 512, the output voltage is about 2.5 V (because 0.00488 V*512≈2.5 V).

[0067] After obtaining the target voltage, the main control chip 400 also generates a corresponding adjustment signal to the drive circuit 300 to control the output frequency of the target voltage. For example, the MCU generates a PWM wave to control the frequency of the target voltage output by the drive circuit 300, wherein the frequency of the PWM signal can be customized, for example, the duty cycle of the PWM signal can be customized, such as the frequency is customized to 1KHz, and the duty cycle is customized to 50%. The drive circuit 300 controls the output frequency of the target voltage according to the PWM adjustment signal generated by the main control chip 400. If the main control chip 400 sets the frequency of the PWM signal to 1kHz and the duty cycle to 50%, the drive circuit 300 will output a voltage signal with a frequency of 1kHz and a duty cycle of 50% to the color-changing filter to achieve the corresponding light transmittance adjustment. That is, the frequency and duty cycle of the PWM signal determine the frequency and amplitude of the output voltage of the drive circuit 300, thereby achieving precise control of the color-changing filter.

[0068] In the technical solution of this embodiment, the main control chip 400 communicates with the signal generating device through the communication circuit 200 to obtain the signal generated by the signal generating device, and outputs the corresponding adjustment signal to the driving circuit 300 based on the signal obtained from the signal generating device. After receiving the adjustment signal, the driving circuit 300 adjusts the amplitude of the working voltage input by the power supply circuit 100 to output the target voltage. At the same time, the adjustment signal of the main control chip 400 also controls the frequency of the target voltage output by the driving circuit 300. The driving circuit 300 outputs the target voltage after adjusting the output frequency to the color-changing filter to achieve control of the transmittance of the color-changing filter. Since the circuit method used to adjust the transmittance of the color-changing filter, there will be no vibration and noise problems caused by mechanical control.

[0069] Continue reading Figure 2 In this embodiment, the driving circuit 300 includes:

[0070] The voltage control circuit 302 is electrically connected to the power supply circuit 100 and is used to step up or step down the working voltage to obtain a target voltage;

[0071] The voltage doubler rectifier circuit 310 is electrically connected to the voltage control circuit 302, and the voltage doubler rectifier circuit 310 is used to double the driving signal output by the voltage control circuit 302;

[0072] The push-pull circuit 320 is electrically connected to the main control chip 400 and the voltage doubler rectifier circuit 310 , respectively. The push-pull circuit 320 is used to adjust the output frequency of the target voltage under the control of the main control chip 400 .

[0073] In this embodiment, the voltage control circuit 302 is electrically connected to the power supply circuit 100 and is mainly used to boost or buck the working voltage to obtain a target voltage, thereby ensuring that the output voltage meets the requirements of the filter.

[0074] The voltage doubler rectifier circuit 310 is electrically connected to the voltage control circuit 302 and is used to double the driving signal output by the voltage control circuit 302. These signals are used to drive the on and off of a certain device of the push-pull circuit 320. The reason why the voltage doubler rectifier driving module is used to double the driving signal output by the voltage control circuit 302 is that the voltage doubler rectifier circuit 310 is used to convert the input pulse width modulation (PWM) signal into a higher DC voltage. Through a specific circuit design, it can double the peak value of the input voltage. This design can provide a higher driving voltage, thereby effectively controlling the conduction operation of the push-pull circuit 320 (the specific reason is that, taking N-channel MOS as an example, for N-channel MOS tube, when the difference between the gate voltage (Vg) and the source voltage (Vs) (i.e., Vgs) is greater than a certain threshold voltage (Vth), the MOS tube will be turned on.

[0075] If the gate voltage and source voltage are both 5V, then Vgs = Vg-Vs = 0V. Since Vgs = 0V is less than the threshold voltage, the MOS tube will not conduct; to make the MOS tube conduct, it is necessary to adjust the difference between the gate voltage and the source voltage. For N-channel MOS tubes, the gate voltage can be increased or the source voltage can be reduced.

[0076] Specifically, the voltage doubler rectifier circuit 310 can double the driving signal into a higher DC voltage. This doubled voltage can be used to drive the gate of the MOS tube to ensure that Vgs is large enough. In layman's terms, the voltage doubler rectifier circuit 310 can be used to increase the 5V signal to a higher voltage (such as 5V or 10V), thereby ensuring that the Vgs of the MOS tube exceeds its threshold voltage and reaches the on state.

[0077] The push-pull circuit 320 in this embodiment is electrically connected to the main control chip 400 and the voltage doubler rectifier circuit 310, respectively. The push-pull circuit 320 mainly adjusts the output frequency of the target voltage in a preset frequency on-off manner under the control of the main control chip 400. Among them, the push-pull circuit 320 can be constructed using MOSFET, and the frequency and amplitude of the output target voltage are adjusted through the PWM signal of the main control chip 400 and the voltage-doubled driving signal, thereby achieving precise control of the transmittance adjustment of the color-changing filter.

[0078] Continue reading Figure 2 In this embodiment, the main control chip 400 includes a first communication terminal SC1;

[0079] The voltage control circuit 302 includes:

[0080] The voltage control chip U16, the power supply terminal 304 of the voltage control chip U16 is electrically connected to the power supply circuit 100, the output terminal 306 of the voltage control chip U16 is electrically connected to the input terminal 322 of the push-pull circuit 320, the first control terminal SW1 of the voltage control chip U16 is electrically connected to the input terminal 312 of the voltage doubler rectifier circuit 310, and the second communication terminal SC of the voltage control chip U16 is communicatively connected to the first communication terminal SC1 of the main control chip 400;

[0081] Among them, the first communication terminal SC1 of the voltage control chip U16 obtains the adjustment signal transmitted by the second communication terminal SC, converts the working voltage of the power supply circuit 100 into the target voltage based on the adjustment signal, and outputs it to the push-pull circuit 320, and at the same time outputs the control signal from the first control terminal SW1 to the voltage doubler rectifier circuit 310.

[0082] In this embodiment, the second communication terminal SC of the voltage control chip U16 is electrically connected to the first communication terminal SC1 of the main control chip 400 to receive the adjustment signal, and the voltage control chip U16 converts the operating voltage of the power supply circuit 100 into the required target voltage according to the received adjustment signal. This conversion process may involve a step-up or step-down operation, depending on the requirements of the input signal.

[0083] The converted target voltage is output by the voltage control chip U16 to the push-pull circuit 320, and at the same time sends a control signal to the voltage doubler rectifier circuit 310. The voltage doubler rectifier circuit 310 multiplies the driving signal according to the received control signal, and at the same time cooperates with the PWM wave sent by the main control chip 400 to control the frequency and amplitude of the output voltage of the push-pull circuit 320, and finally determines the transmittance of the filter.

[0084] See also Figure 2 and Figure 3 , Figure 2 : is a circuit diagram of a control circuit of a color-changing filter in one embodiment of the utility model, Figure 3 This is a circuit diagram of a main control chip according to an embodiment of the utility model.

[0085] In this embodiment, the main control chip 400 includes a second control terminal 404;

[0086] The push-pull circuit 320 includes:

[0087] A first switch tube Q1, wherein the source of the first switch tube Q1 is electrically connected to the output terminal 306 of the voltage control chip U16, the gate of the first switch tube Q1 is electrically connected to the output terminal of the voltage doubler rectifier circuit 310, and the source of the first switch tube Q1 is electrically connected to the positive electrode of the color-changing filter;

[0088] A second switch tube Q2, wherein the drain of the second switch tube Q2 is electrically connected to the gate of the first switch tube Q1, the source of the second switch tube Q2 is grounded, and the gate of the second switch tube Q2 is electrically connected to the second control terminal 404 of the main control chip 400;

[0089] The main control chip 400 outputs a corresponding adjustment signal to the gate of the second switch tube Q2 through the second control terminal 404 to control the second switch tube Q2 to lower the level of the gate of the first switch tube Q1 when it is turned on.

[0090] In this embodiment, the first switch tube Q1 and the second switch tube Q2 may be N-type MOS tubes, specifically, the first switch tube Q1 and the second switch tube Q2 may be IRF540 or IRLZ44N. These MOS tubes have the advantages of high efficiency and low on-resistance and are suitable for high-frequency switching applications.

[0091] In actual application, the voltage control chip U16 outputs the converted target voltage to the drain of the first switch tube Q1. At the same time, the voltage control chip U16 outputs a drive signal to the voltage doubler rectifier circuit 310 through the first control terminal SW1. The drive signal is output to the gate of the first switch tube Q1 after voltage doubling. At this time, the gate of the first switch tube Q1 is at a high level, the drain and the source are turned on, and the target voltage is output to the positive electrode of the color-changing filter.

[0092] At the same time, the main control chip 400 includes a second control terminal 404 that outputs a high-level signal to the gate of the second switch tube Q2, so that the second switch tube is turned on. Since the drain of the second switch tube Q2 is connected to the gate of the first switch tube Q1, and the source of the second switch tube Q2 is grounded, when the second switch tube Q2 is turned on, the level of the gate of the first switch tube Q1 will be pulled down, so that the first switch tube Q1 is turned off. The main control chip 400 controls the conduction and shutdown of the second switch tube Q2 at a preset frequency (such as 1kHz, duty cycle 50%), thereby repeatedly pulling up and lowering the gate level of the first switch tube Q1 to form a push-pull output. In this way, the output frequency and amplitude of the target voltage can be accurately controlled to ensure the precise adjustment of the color filter.

[0093] Continue reading Figure 2 In this embodiment, the push-pull circuit 320 further includes:

[0094] The third switch tube Q3, the drain of the second switch tube Q2 is electrically connected to the source of the first switch tube Q1, the source of the second switch tube Q2 is grounded, the gate of the second switch tube Q2 is electrically connected to the second control terminal 404 of the main control chip 400, and the third switch tube Q3 is used to release the electrical energy between the first switch tube Q1 and the positive electrode of the color-changing filter when it is turned on.

[0095] In this embodiment, this embodiment is written mainly because the third switch tube Q3 can still be an N-channel MOS tube. When the first switch tube Q1 is turned off, the third switch tube Q3 is turned on. The main function of the third switch tube Q3 is to release the voltage between the first switch tube Q1 and the positive electrode of the color-changing filter.

[0096] In this embodiment, the third switch tube Q3 is provided because when the first switch tube Q1 is turned off, voltage may be retained between the gate and the source, causing the color-changing filter to be unable to respond to the adjustment signal quickly, thereby affecting the transmittance adjustment accuracy of the filter.

[0097] Therefore, the third switch tube Q3 is set, which can be turned on when the first switch tube Q1 is turned off, releasing the electric energy between the first switch tube Q1 and the positive electrode of the color-changing filter, ensuring rapid voltage release. That is, the setting of the third switch tube Q3 improves the response speed and adjustment accuracy of the system, avoids the problem of voltage retention, and ensures rapid and accurate adjustment of the color-changing filter.

[0098] Continue reading Figure 2 In this embodiment, the voltage doubler rectifier circuit 310 includes:

[0099] Two first diodes D1, anodes of the two first diodes D1 are electrically connected to the first control terminal SW1 of the voltage control chip U16, and cathodes of the two first diodes D1 are electrically connected to the gate of the first switch tube Q1;

[0100] Two second diodes D2, anodes of the two second diodes D2 are electrically connected to the output terminal 306 of the voltage control chip U16, and cathodes of the two second diodes D2 are electrically connected to cathodes of the two first diodes D1 respectively.

[0101] The voltage doubling rectifier circuit 310 in this embodiment realizes voltage doubling of the driving signal through four diodes to drive the MOS tube. The anodes of the two first diodes D1 are connected to the first control terminal SW1 of the voltage control chip U16, and the cathodes are connected to the gate of the first switch tube Q1. This part of the circuit is mainly used to rectify the control signal from the voltage control chip U16 and transmit it to the gate of the MOS tube.

[0102] Specifically, the anodes of the two second diodes D2 are connected to the output terminal 306 of the voltage control chip U16, and the cathodes are respectively connected to the cathodes of the two first diodes D1. In this way, the voltage doubling effect of the signal can be achieved. For MOS tubes, the gate voltage (Vgs) must be higher than the source voltage (Vs) by a certain value to effectively conduct. Through the voltage doubling circuit, the voltage can be increased to the driving voltage range required by the MOS tube to ensure its effective operation. At the same time, providing a higher gate voltage after voltage doubling can effectively enhance the conduction ability of the MOS tube, reduce the on-resistance, and improve the efficiency and performance of the system.

[0103] In the voltage doubling circuit, the diode allows the current to pass in one direction, and through a specific connection method, the diode and the capacitor can combine the peak value of the input voltage to achieve the voltage doubling effect. The diode can also protect other components in the circuit and prevent the reverse voltage from damaging the circuit.

[0104] By properly configuring and using diodes, the voltage doubler rectifier circuit 310 can effectively increase the voltage of the control signal, drive the normal operation of the MOS tube, and ensure the precise adjustment and stable operation of the color-changing filter.

[0105] Continue reading Figure 2 In this embodiment, the voltage doubler rectifier circuit 310 further includes an inductor L6, and the inductor L6 is electrically connected between the anodes of the two first diodes D1.

[0106] In this embodiment, the inductor L6 is electrically connected between the anodes of the two first diodes D1 and is mainly used for voltage smoothing and filtering.

[0107] The voltage control chip U16 converts the operating voltage of the power supply circuit 100 into a target voltage and outputs it to the drain of the first switch tube Q1. At the same time, the voltage control chip U16 outputs a drive signal to the inductor L6 through the first control terminal SW1. The inductor L6 stores energy when the current changes and releases energy when the current decreases, thereby smoothing the current and voltage, reducing noise and ripple, and ensuring the stability of the output signal. The drive signal then passes through a double voltage rectifier circuit, and after being doubled by four diodes, it is boosted to a higher voltage to drive the gate of the first switch tube Q1.

[0108] In this embodiment, the inductor L6 is used in conjunction with the diode to effectively smooth the voltage output, reduce ripple and noise, and provide a more stable driving voltage. At the same time, the filtering effect of the inductor L6 can reduce voltage spikes, protect sensitive components from damage by overvoltage, and extend the service life of the system.

[0109] The control circuit of the color-changing filter in this embodiment can achieve highly accurate and reliable voltage regulation. After adding the inductor L6, the voltage doubler rectifier circuit 310 further optimizes the signal stability and system protection function while providing high voltage drive, and is suitable for application scenarios that require high-precision transmittance adjustment, such as filter adjustment in the fields of photography, architecture, and automobiles.

[0110] See also Figure 4 , Figure 4 4 is a circuit diagram of a wireless communication circuit in one embodiment of the present utility model.

[0111] In this embodiment, the main control chip 400 includes a second communication terminal SC;

[0112] The communication circuit 200 comprises:

[0113] The wireless communication circuit 202 includes a signal receiving end for connecting to an antenna to perform wireless communication with a signal generating device, and a third communication end BT3 of the wireless communication is connected to a fourth communication end BT4 of the main control chip 400 .

[0114] In this embodiment, the wireless communication module is the core of the entire wireless communication circuit 202, responsible for receiving and sending wireless signals. It includes a signal receiving end for connecting an antenna to achieve wireless communication with an external signal generating device. The signal generating device can be a variety of different devices, such as a hand wheel, a host computer, etc.

[0115] The antenna is connected to the signal receiving end for receiving and sending wireless signals. The selection and installation position of the antenna are crucial to ensure the stability and effectiveness of signal transmission. Of course, in some embodiments, the wireless communication module can integrate the antenna without additional configuration.

[0116] The third communication terminal BT3 of the wireless communication module is communicatively connected to the fourth communication terminal BT4 of the main control chip 400 to ensure that the wirelessly received signal can be correctly transmitted to the main control chip 400 for processing.

[0117] During the operation of the wireless communication circuit 202, when the signal generating device (such as a hand wheel or a host computer) generates a control signal, the signal is sent to the antenna via wireless transmission. After the antenna receives the signal, it is transmitted to the signal receiving end of the wireless communication module. After the wireless communication module receives the signal, it demodulates and processes the signal to ensure the accuracy of the signal. The processed signal is transmitted to the fourth communication terminal BT4 of the main control chip 400 via the third communication terminal BT3 of the wireless communication module.

[0118] After receiving the signal from the wireless communication module, the main control chip 400 processes it according to the preset control logic. By analyzing the signal, the main control chip 400 generates corresponding control instructions, further drives the voltage control circuit 302 and other related components, and realizes the precise adjustment of the color filter.

[0119] In this embodiment, the application of the wireless communication circuit 202 allows the signal generating device (such as the hand-cranked wheel and the host computer) to move freely, thereby increasing the flexibility and convenience of operation.

[0120] Through wireless communication, the color-changing filter can be remotely controlled, which is suitable for a variety of application scenarios, such as drone photography, smart building optical adjustment, etc.

[0121] In this embodiment, the control circuit of the color-changing filter can achieve higher flexibility and convenience through the design of the wireless communication circuit 202. The close cooperation between the wireless communication module and the main control chip 400 ensures the stable transmission and accurate processing of the signal, provides an efficient and reliable solution for the adjustment of the color-changing filter, and is suitable for various application scenarios that require remote and accurate control.

[0122] See also Figure 5 , Figure 5 4 is a circuit diagram of a wireless communication circuit in one embodiment of the present utility model.

[0123] In this embodiment, the communication circuit 200 further includes a wired communication circuit 204 , which is electrically connected to the coding switch and generates a signal when the coding switch is turned and transmits the signal to the main control chip 400 .

[0124] In this embodiment, the wired communication circuit 204 is designed because the wired communication circuit 204 can be used to deal with some special situations (for example, in a device or area with limited power supply, the wireless communication module may increase the power consumption of the device, while wired communication usually has lower power consumption and is more suitable for this situation) and provide a more reliable and stable communication method.

[0125] It should be noted that the coding switch mentioned in this embodiment is a mechanical switch. When the user flips the switch, a corresponding electrical signal is generated. The state of the coding switch is transmitted to the main control chip 400 through the wired communication circuit 204, and the main control chip 400 performs corresponding operations according to the received signal.

[0126] When the user turns the coding switch, the coding switch will generate a series of electrical signals, which represent different instructions or parameter settings.

[0127] The generated electrical signal is transmitted to the main control chip 400 through the wired communication circuit 204. The wired communication circuit 204 ensures the stability and accuracy of the signal during transmission without interference from wireless signals. After receiving the signal from the wired communication circuit 204, the main control chip 400 processes it according to the preset control logic. By analyzing the signal, the main control chip 400 generates corresponding control instructions, further drives the voltage control circuit 302 and other related components, and realizes precise adjustment of the color filter.

[0128] In this embodiment, the wired communication has a low delay and can achieve real-time signal transmission and response, which is suitable for occasions requiring fast feedback and high-precision control. In addition, wired communication can be used in some environments where wireless signals cannot be covered or the signals are weak, ensuring the normal operation and stable control of the system.

[0129] In some embodiments, the two communication modes can be combined to achieve stable signal transmission and flexible selection to meet the needs of different application scenarios. For example, wireless communication can be selected in scenarios requiring long-distance control or high device mobility, while wired communication can be selected in scenarios requiring high stability and low power consumption.

[0130] Specifically, when the power supply is limited, the wireless communication module may increase the power consumption of the device, while wired communication usually has lower power consumption and is more suitable for this situation. Through wired communication, it can be ensured that the device can still reliably transmit signals in low-power mode.

[0131] When there is sufficient power, wireless communication can be used first, providing greater flexibility and convenience and avoiding the complexity of wiring.

[0132] The utility model further proposes an electrically controlled color-changing filter, including a bracket 500, a color-changing filter, and a control circuit of the color-changing filter in the aforementioned embodiment. The specific structure of the control circuit of the color-changing filter refers to the aforementioned embodiment. Since the electrically controlled color-changing filter adopts all the technical solutions of all the aforementioned embodiments, it at least has all the technical effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here. Among them, the bracket 500 is formed with a light-transmitting window 502; the color-changing glass 504 is installed in the light-transmitting window 502; and the control circuit of the color-changing filter is also installed inside the bracket 500.

[0133] The core of the electric color filter lies in the cooperation between the color-changing glass 504 and the control circuit. The control circuit changes the light transmittance of the color-changing glass 504 by accurately adjusting the voltage, thereby realizing the control of the light entering the light-transmitting window 502. The specific working process is as follows:

[0134] The control circuit receives control signals from external devices (such as hand-cranked wheels, host computers, etc.). The control circuit converts the received signals into corresponding voltage outputs to drive the color-changing glass 504 to change the light transmittance. By adjusting the voltage, the light transmittance of the color-changing glass 504 changes, achieving precise control of light.

[0135] The electrically controlled color-changing filter can be widely used in various photographic equipment, providing flexible and precise light control to meet different shooting requirements.

[0136] For example, in film and television shooting, the electronically controlled color filter can quickly adjust the transmittance according to the changes in light in the shooting scene to ensure the best exposure effect.

[0137] Through wireless or wired control, photographers can adjust filters in real time remotely or on-site to improve shooting efficiency and effects.

[0138] When applied to SLR cameras, the electronically controlled color filter can effectively cope with the rapid changes in light, reduce overexposure or underexposure, and improve the quality of photos. The built-in control circuit allows the photographer to accurately adjust the filter through the hand wheel or the host computer to adapt to various shooting environments.

[0139] Of course, in some embodiments, it can be applied to drone photography. For example, when the drone is in flight, the light changes are complex, and the electrochromic filter can automatically adjust the transmittance to ensure the stability of the shooting and the image quality. At the same time, the user can remotely and real-time control the filter status through the wireless control module.

[0140] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A control circuit for a color-changing filter, characterized in that: include: A power supply circuit, wherein the power supply circuit is used to provide an operating voltage; A communication circuit, the communication circuit is used to communicate with the signal generating device; A main control chip, the main control chip is electrically connected to the communication circuit, and the main control chip is used to obtain the signal generated by the signal generating device through the communication circuit, and output a corresponding adjustment signal based on the signal; A driving circuit, wherein the driving circuit is electrically connected to the power supply circuit and the main control chip, and is used to adjust the operating voltage output by the power supply circuit to a target voltage, and adjust the output frequency of the target voltage based on an adjustment signal output from the main control chip, so as to output the target voltage after adjusting the output frequency to the color-changing filter.

2. The control circuit of the color-changing filter according to claim 1, characterized in that: The driving circuit comprises: a voltage control circuit, electrically connected to the power supply circuit, and configured to step up or step down the operating voltage to obtain the target voltage; a voltage doubling rectifier circuit, electrically connected to the voltage control circuit, the voltage doubling rectifier circuit being used to double the voltage of the drive signal output by the voltage control circuit; The push-pull circuit is electrically connected to the main control chip and the voltage doubler rectifier circuit respectively, and the push-pull circuit is used to adjust the output frequency of the target voltage under the control of the main control chip.

3. The control circuit of the color-changing filter according to claim 2, characterized in that: The main control chip includes a first communication terminal; The voltage control circuit comprises: A voltage control chip, wherein a power supply end of the voltage control chip is electrically connected to the power supply circuit, an output end of the voltage control chip is electrically connected to an input end of the push-pull circuit, a first control end of the voltage control chip is electrically connected to an input end of the voltage doubler rectifier circuit, and a second communication end of the voltage control chip is communicatively connected to a first communication end of the main control chip; Among them, the voltage control chip obtains the adjustment signal transmitted by the second communication end through the first communication end, converts the working voltage of the power supply circuit into a rated voltage based on the adjustment signal, outputs it to the push-pull circuit, and simultaneously outputs a control signal from the first control end to the voltage doubler rectifier circuit.

4. The control circuit of the color-changing filter according to claim 3, characterized in that: The main control chip includes a second control terminal; The push-pull circuit comprises: a first switch tube, wherein the source of the first switch tube is electrically connected to the output end of the voltage control chip, the gate of the first switch tube is electrically connected to the output end of the voltage doubler rectifier circuit, and the source of the first switch tube is electrically connected to the positive electrode of the color-changing filter; a second switch tube, wherein a drain of the second switch tube is electrically connected to a gate of the first switch tube, a source of the second switch tube is grounded, and a gate of the second switch tube is electrically connected to a second control terminal of the main control chip; The main control chip outputs a corresponding regulating signal to the gate of the second switch tube through the second control terminal, so as to control the second switch tube to lower the level of the gate of the first switch tube when the second switch tube is turned on.

5. The control circuit of the color-changing filter according to claim 4, characterized in that: The push-pull circuit also includes: A third switch tube, wherein the drain of the third switch tube is electrically connected to the source of the first switch tube, the source of the third switch tube is grounded, the gate of the third switch tube is electrically connected to the second control terminal of the main control chip, and the third switch tube is used to release the electrical energy between the first switch tube and the positive electrode of the color-changing filter when it is turned on.

6. The control circuit of the color-changing filter according to claim 3, characterized in that: The voltage doubler rectifier circuit comprises: Two first diodes, wherein anodes of the two first diodes are electrically connected to the first control terminal of the voltage control chip, and cathodes of the two first diodes are electrically connected to the gate of the first switch tube; Two second diodes, anodes of the two second diodes are electrically connected to the output end of the voltage control chip, and cathodes of the two second diodes are electrically connected to the cathodes of the two first diodes respectively.

7. The control circuit of the color-changing filter according to claim 6, characterized in that: The voltage doubler rectifier circuit further includes an inductor, which is electrically connected between the anodes of the two first diodes.

8. The control circuit of the color-changing filter according to claim 1, characterized in that: The main control chip includes a fourth communication terminal; The communication circuit comprises: A wireless communication circuit, wherein the signal receiving end of the wireless communication circuit is used to connect to an antenna to wirelessly communicate with the signal generating device, and the third communication end of the wireless communication circuit is connected to the fourth communication end of the main control chip.

9. The control circuit of the color-changing filter according to claim 1, characterized in that: The communication circuit also includes a wired communication circuit, which is used to be electrically connected to a coding switch and generate a signal when the coding switch is turned and transmit it to the main control chip.

10. An electrically controlled color-changing filter, characterized in that: include: A bracket, wherein the bracket is formed with a light-transmitting window; Photochromic glass, the photochromic glass is installed in the light-transmitting window; as well as The control circuit of the color-changing filter according to any one of claims 1 to 9, wherein the control circuit of the color-changing filter is also installed inside the bracket.

Images