Control circuit of photochromic glass

Abstract

The utility model discloses a control circuit of photochromic glass, which relates to the field of photochromic glass control and comprises a control module, a first switch driving circuit, a second switch driving circuit, a driving module, a first switch tube, a second switch tube and a third switch tube. The first switch tube provides voltage for the first end of the second switch tube and the first end of the third switch tube through conduction, and the conduction or the disconnection of the second switch tube, the conduction or the disconnection of the third switch tube and the negative electrode grounding or the positive electrode grounding of the photochromic glass driven by the driving module are mutually matched, so that the positive conduction or the negative conduction of the photochromic glass is realized; the color change of the photochromic glass is quickly adjusted, and the driving safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of photochromic glass control, and in particular to a control circuit for photochromic glass. Background Technology

[0002] At night, glare from other vehicles' headlights can distract drivers and create potential driving risks. With the development of the automotive industry, the need to address this problem has become increasingly urgent. Electrochromic glass for rearview mirrors has emerged as an important innovative invention. By applying a small current and voltage, the glass changes color, effectively reducing the impact of glare from following headlights on the driver at night and improving driving safety.

[0003] The commonly used photochromic technology for car rearview mirrors works by outputting voltage to electrochromic glass through specific pins of a gating chip, such as... Figure 1 As shown, this circuit achieves a color-changing effect. However, due to the unidirectional nature of its output, it can only be restored to its natural state by cutting off the current or discharging it. This control method results in a slow color-changing speed and an inability to quickly respond to changes in light, which greatly limits its functionality in actual driving scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a control circuit for photochromic glass. The first switch provides voltage to the first terminals of the second and third switches by turning on. The interaction between the second switch turning on or off, the third switch turning on or off, and the drive module driving the photochromic glass to ground its negative or positive terminal, enables the photochromic glass to conduct in either the forward or reverse direction, thereby achieving rapid adjustment of the photochromic glass's color and improving driving safety.

[0005] To solve the above-mentioned technical problems, this utility model provides a control circuit for photochromic glass, including a control module, a first switch driving circuit, a second switch driving circuit, a driving module, a first switch transistor, a second switch transistor, and a third switch transistor;

[0006] The second end of the first switching transistor is connected to the first end of the second switching transistor and the first end of the third switching transistor;

[0007] The second terminal of the second switching transistor is connected to the positive electrode of the photochromic glass and the driving module, and the control terminal of the second switching transistor is connected to the output terminal of the first switching driving circuit.

[0008] The second terminal of the third switch is connected to the negative terminal of the photochromic glass and the driving module, and the control terminal of the third switch is connected to the output terminal of the second switch driving circuit.

[0009] The first terminal of the first switching transistor is connected to the power output terminal of the control module. The control terminal of the first switching transistor, the input terminal of the first switching drive circuit, the input terminal of the second switching drive circuit, and the drive module are all connected to the control output terminal of the control module. The drive module is used to drive the photochromic glass to ground at the negative or positive terminal based on the control of the control module.

[0010] Optionally, the first switch driving circuit includes a fourth switch transistor, a fifth switch transistor, a first resistor, a second resistor, and a third resistor;

[0011] The first end of the first resistor is connected to the control output end of the control module as the input end of the first switch driving circuit, and the second end of the first resistor is connected to the control end of the fourth switch.

[0012] The first terminal of the fourth switch is grounded, and the second terminal of the fourth switch is connected to the first terminal of the second resistor;

[0013] The second end of the second resistor is connected to the control terminal of the fifth switching transistor;

[0014] The first terminal of the fifth switch is connected to the power supply voltage, and the second terminal of the fifth switch is connected to the first terminal of the third resistor;

[0015] The second end of the third resistor is connected to the control terminal of the second switching transistor.

[0016] Optionally, the second switch driving circuit includes a sixth switch transistor, a seventh switch transistor, a fourth resistor, a fifth resistor, and a sixth resistor;

[0017] The first end of the fourth resistor is connected to the control output end of the control module as the input end of the second switch driving circuit, and the second end of the fourth resistor is connected to the control end of the sixth switch.

[0018] The first terminal of the sixth switch is grounded, and the second terminal of the sixth switch is connected to the first terminal of the fifth resistor;

[0019] The second end of the fifth resistor is connected to the control terminal of the seventh switch transistor;

[0020] The first terminal of the seventh switch is connected to the power supply voltage, and the second terminal of the seventh switch is connected to the first terminal of the sixth resistor;

[0021] The second end of the sixth resistor is connected to the control terminal of the third switch.

[0022] Optionally, the control module includes an MCU and a gating chip;

[0023] The MCU is connected to the gate control chip, the input terminal of the first switch driving circuit, the input terminal of the second switch driving circuit, and the driving module respectively.

[0024] The gate control chip is connected to the first terminal of the first switching transistor and the control terminal of the first switching transistor, respectively.

[0025] Optionally, it also includes a first filtering module, wherein a first terminal of the first filtering module is connected to the common terminal of the control terminal of the first switching transistor and the control output terminal of the control module, and a second terminal of the first filtering module is grounded.

[0026] Optionally, the first filtering module is a capacitor.

[0027] Optionally, a second filtering module and a third filtering module may also be included;

[0028] The first terminal of the second filter module is connected to the second terminal of the second switching transistor, the positive electrode of the photochromic glass, and the common terminal of the driving module, and the second terminal of the second filter module is grounded.

[0029] The first terminal of the third filter module is connected to the second terminal of the third switch, the negative terminal of the photochromic glass, and the common terminal of the drive module, and the second terminal of the third filter module is grounded.

[0030] Optionally, both the second and third filtering modules are capacitors.

[0031] Optionally, the drive module includes an eighth switch and a ninth switch;

[0032] The control terminal of the eighth switch is connected to the control output terminal of the control module, the first terminal of the eighth switch is connected to the common terminal of the second terminal of the second switch and the positive terminal of the photochromic glass, and the second terminal of the eighth switch is grounded.

[0033] The control terminal of the ninth switch is connected to the control output terminal of the control module. The first terminal of the ninth switch is connected to the common terminal of the second terminal of the third switch and the negative terminal of the photochromic glass. The second terminal of the ninth switch is grounded.

[0034] Optionally, it may also include a seventh resistor, an eighth resistor, and a ninth resistor, and the drive module may also include a diagnostic module;

[0035] The first end of the seventh resistor is connected to the control output terminal of the control module, and the second end of the seventh resistor is connected to the common terminal of the first end of the ninth resistor and the diagnostic module.

[0036] The first end of the eighth resistor is connected to the control output terminal of the control module, and the second end of the eighth resistor is connected to the common terminal of the first end of the ninth resistor and the diagnostic module.

[0037] The second terminal of the ninth resistor is connected to the power supply voltage;

[0038] The diagnostic module is connected to the control terminal of the eighth switch and the control terminal of the ninth switch, respectively.

[0039] This application provides a control circuit for photochromic glass, including a control module, a first switch driving circuit, a second switch driving circuit, a driving module, a first switch transistor, a second switch transistor, and a third switch transistor. The first switch transistor provides voltage to the first terminals of the second and third switch transistors by being turned on. The interaction between the second switch transistor being turned on or off, the third switch transistor being turned on or off, and the driving module driving the photochromic glass to ground its negative or positive terminal, realizes the forward or reverse conduction of the photochromic glass, so as to quickly adjust the color of the photochromic glass and improve driving safety. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the control circuit of a conventional photochromic glass disclosed in this utility model;

[0042] Figure 2 This is a schematic diagram of the control circuit for a photochromic glass disclosed in this utility model;

[0043] Figure 3 This is a schematic diagram of the structure of a first switch driving circuit and a second switch driving circuit disclosed in this utility model;

[0044] Figure 4 This is a schematic diagram of the control circuit for a specific type of photochromic glass disclosed in this utility model;

[0045] Figure 5 This is a schematic diagram of the bidirectional current flow direction of a photochromic glass disclosed in this utility model;

[0046] Figure 6 This is a schematic diagram of the structure of a drive module disclosed in this utility model;

[0047] The attached diagram is labeled as follows: 1 is the control module, 2 is the first switch drive circuit, 3 is the second switch drive circuit, 4 is the drive module, 5 is the photochromic glass, 6 is the gate control chip, and 7 is the diagnostic module. Detailed Implementation

[0048] The core of this utility model is to provide a control circuit for photochromic glass. The first switch provides voltage to the first terminals of the second and third switches by turning on. The interaction between the second switch turning on or off, the third switch turning on or off, and the drive module driving the photochromic glass to ground the negative or positive terminal, realizes the forward or reverse conduction of the photochromic glass, enabling rapid adjustment of the color of the photochromic glass and improving driving safety.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0050] For details, please see Figure 2 As shown, Figure 2 This is a schematic diagram of the control circuit for a photochromic glass disclosed in this utility model.

[0051] The control circuit for the photochromic glass includes a control module 1, a first switch drive circuit 2, a second switch drive circuit 3, a drive module 4, a first switch transistor Q1, a second switch transistor Q2, and a third switch transistor Q3. The second terminal of the first switch transistor Q1 is connected to the first terminals of the second switch transistor Q2 and the third switch transistor Q3. The second terminal of the second switch transistor Q2 is connected to the positive terminal of the photochromic glass 5 and the drive module 4, and the control terminal of the second switch transistor Q2 is connected to the output terminal of the first switch drive circuit 2. The second terminal of the third switch transistor Q3 is connected to the negative terminal of the photochromic glass 5 and the drive module 4, and the control terminal of the third switch transistor Q3 is connected to the output terminal of the second switch drive circuit 3. The first terminal of the first switch transistor Q1 is connected to the power output terminal of the control module 1. The control terminal of the first switch transistor Q1, the input terminal of the first switch drive circuit 2, the input terminal of the second switch drive circuit 3, and the drive module 4 are all connected to the control output terminal of the control module 1.

[0052] It should be noted that the control output terminals of control module 1 include a first control output terminal, a second control output terminal, a third control output terminal, a fourth control output terminal, and a fifth control output terminal, and the drive module 4 includes a first control terminal, a second control terminal, a first input terminal, and a second input terminal. Specifically, the first control output terminal of control module 1 is connected to the control terminal of the first switching transistor Q1; the second control output terminal of control module 1 is connected to the input terminal of the first switch drive circuit 2; the third control output terminal of control module 1 is connected to the input terminal of the second switch drive circuit 3; the fourth control output terminal of control module 1 is connected to the first control terminal IN1 of drive module 4; the fifth control output terminal of control module 1 is connected to the second control terminal IN2 of drive module 4; the first input terminal DRAIN1 of drive module 4 is connected to the second terminal of the second switching transistor Q2 and the positive terminal of the photochromic glass 5; and the second input terminal DRAIN2 of drive module 4 is connected to the second terminal of the third switching transistor Q3 and the negative terminal of the photochromic glass 5.

[0053] In this embodiment, the photochromic glass 5 is an electrochromic glass 5. When the rearview mirror electrochromic glass 5 sensor detects that a color change is required, the power output terminal of the control module 1 outputs a specific voltage V1, the first control output terminal of the control module 1 outputs a first control signal, the first control signal controls the first switch Q1 to turn on, and the second terminal of the first switch Q1 outputs V1 to the first terminal of the first switch Q1 and the first terminal of the second switch Q2. Simultaneously, the second control output terminal of control module 1 outputs a second control signal, and the third control output terminal of control module 1 outputs a third control signal. If the second control signal is high, the second control signal controls the first switch drive circuit 2 to output a high level, the second switch transistor Q2 is turned on, and the voltage at the positive terminal of the photochromic glass 5 is V1. If the second control signal is low, the first switch drive circuit 2 has no output, and the second switch transistor Q2 is turned off. If the third control signal is high, the third control signal controls the second switch drive circuit 3 to output a high level, the third switch transistor Q3 is turned on, and the voltage at the negative terminal of the photochromic glass 5 is V1. If the third control signal is low, the second switch drive circuit 3 has no output, and the third switch transistor Q3 is turned off. Furthermore, the fourth control output terminal of control module 1 outputs the fourth control signal, and the fifth control output terminal of control module 1 outputs the fifth control signal. If the second control signal is high and the third control signal is low, and the voltage of the positive terminal of the photochromic glass 5 is V1, then the fourth control signal is low and the fifth control signal is high. In this case, the negative terminal of the photochromic glass 5 is grounded through the second input terminal DRAIN2 of the drive module 4, and the photochromic glass 5 is forward-biased, causing the color of the photochromic glass 5 to darken. If the second control signal is low and the third control signal is high, and the voltage of the negative terminal of the photochromic glass 5 is V1, then the fourth control signal is high and the fifth control signal is low. In this case, the positive terminal of the photochromic glass 5 is grounded through the first input terminal DRAIN1 of the drive module 4, and the photochromic glass 5 is reverse-biased, causing the color of the photochromic glass 5 to lighten. In this system, the first switch Q1, the second switch Q2, and the third switch Q3 can all be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors). By controlling the high-level duration of the second, third, fourth, and fifth control signals, the conduction time of the second switch and the negative electrode grounding time of the photochromic glass 5 are controlled, thereby controlling the conduction time of the forward current of the photochromic glass 5 to make the photochromic glass 5 darken to a specific state. Alternatively, the conduction time of the third switch and the positive electrode grounding time of the photochromic glass 5 are controlled, thereby controlling the conduction time of the reverse current of the photochromic glass 5 to make the photochromic glass 5 lighten to a specific state.

[0054] In addition, the input terminal of the control module 1 is connected to the second terminal of the first switch Q1, the first terminal of the second switch Q2, and the first terminal of the third switch Q3, and is used to determine whether the second switch Q2 and the third switch Q3 have received voltage.

[0055] As can be seen, in this embodiment, the first switch Q1 provides voltage to the first terminal of the second switch Q2 and the first terminal of the third switch Q3 by being turned on. The interaction between the second switch Q2 being turned on or off, the third switch Q3 being turned on or off, and the drive module 4 driving the photochromic glass 5 to be grounded at the negative or positive terminal, realizes the forward or reverse conduction of the photochromic glass 5, so as to quickly adjust the color of the photochromic glass 5 and improve driving safety.

[0056] Based on the above embodiments:

[0057] For details, please see Figure 3 and Figure 4 As shown, Figure 3 This is a schematic diagram of the structure of a first switch driving circuit and a second switch driving circuit disclosed in this utility model. Figure 4 This is a schematic diagram of the control circuit for a specific type of photochromic glass disclosed in this utility model.

[0058] As an optional embodiment, the first switch driving circuit 2 includes a fourth switch transistor Q4, a fifth switch transistor Q5, a first resistor R1, a second resistor R2, and a third resistor R3; the first end of the first resistor R1 serves as the input end of the first switch driving circuit 2 and is connected to the control output end of the control module 1, and the second end of the first resistor R1 is connected to the control end of the fourth switch transistor Q4; the first end of the fourth switch transistor Q4 is grounded, and the second end of the fourth switch transistor Q4 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is connected to the control end of the fifth switch transistor Q5; the first end of the fifth switch transistor Q5 is connected to the power supply voltage, and the second end of the fifth switch transistor Q5 is connected to the first end of the third resistor R3; the second end of the third resistor R3 is connected to the control end of the second switch transistor Q2.

[0059] In this embodiment, the first end of the first resistor R1 is connected to the second control output end of the control module 1 as the input end of the first switch driving circuit 2. When the sensor of the electrochromic glass 5 in the rearview mirror detects that a color change is needed, the second control output terminal of the control module 1 outputs a second control signal. If the second control signal is high, the voltage at the control terminal of the fourth switch Q4 is higher than the voltage at the first terminal, so the fourth switch Q4 is turned on, and the second terminal of the fourth switch Q4 outputs a low level. The control terminal of the fifth switch Q5 is connected to the second terminal of the fourth switch Q4 through the second resistor R2. The control terminal of the fifth switch Q5 is low, and the voltage at the control terminal of the fifth switch Q5 is lower than the voltage at the first terminal, so the fifth switch Q5 is turned on. The second terminal of the fifth switch Q5 outputs a power supply voltage to the control terminal of the second switch Q2, so the second switch Q2 is turned on, and the voltage at the positive terminal of the electrochromic glass 5 is V1. If the second control signal is low, the voltage at the control terminal of the fourth switch Q4 is lower than the voltage at the first terminal, so both the fourth switch Q4 and the fifth switch Q5 are turned off, the fifth switch Q5 has no output, and the second switch Q2 is turned off. Both the fourth switch Q4 and the fifth switch Q5 can be transistors.

[0060] As can be seen, in this embodiment, the second switch Q2 is turned on or off by the cooperation of the fourth switch Q4 and the fifth switch Q5, so as to control the voltage of the positive electrode of the photochromic glass 5.

[0061] As an optional embodiment, the second switch driving circuit 3 includes a sixth switch Q6, a seventh switch Q7, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the first end of the fourth resistor R4 serves as the input end of the second switch driving circuit 3 and is connected to the control output end of the control module 1, and the second end of the fourth resistor R4 is connected to the control end of the sixth switch Q6; the first end of the sixth switch Q6 is grounded, and the second end of the sixth switch Q6 is connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is connected to the control end of the seventh switch Q7; the first end of the seventh switch Q7 is connected to the power supply voltage, and the second end of the seventh switch Q7 is connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected to the control end of the third switch Q3.

[0062] For an introduction to the second switch driving circuit 3 provided in this embodiment, please refer to the embodiment of the first switch driving circuit 2 described above. This utility model will not be described again here.

[0063] As an optional embodiment, the control module 1 includes an MCU (Microcontroller Unit) and a gate chip 6; the MCU is connected to the gate chip 6, the input terminal of the first switch driving circuit 2, the input terminal of the second switch driving circuit 3, and the driving module 4 respectively; the gate chip 6 is connected to the first terminal of the first switch Q1 and the control terminal of the first switch Q1 respectively.

[0064] It should be noted that the gate control chip 6 includes a control terminal, a power output terminal, and a control output terminal, while the MCU includes a first control output terminal, a second control output terminal, a third control output terminal, a fourth control output terminal, and a fifth control output terminal.

[0065] In this embodiment, the first control output terminal of the MCU is connected to the control terminal of the gate chip 6, the second control output terminal of the MCU is connected to the input terminal of the first switch driving circuit 2 as the second control output terminal of the control module 1, the third control output terminal of the MCU is connected to the input terminal of the second switch driving circuit 3 as the third control output terminal of the control module 1, the fourth control output terminal of the MCU is connected to the first control terminal IN1 of the drive module 4 as the fourth control output terminal of the control module 1, the fifth control output terminal of the MCU is connected to the second control terminal IN2 of the drive module 4 as the fifth control output terminal of the control module 1, the power output terminal of the gate chip 6 is connected to the first terminal of the first switch Q1 as the power output terminal of the control module 1, and the control output terminal of the gate chip 6 is connected to the control terminal of the first switch Q1 as the first control output terminal of the control module 1.

[0066] Specifically, when the rearview mirror electrochromic glass 5 sensor detects that a color change is needed, the MCU controls the power output terminal of the gate control chip 6 to output a specific voltage V1, the control output terminal of the gate control chip 6 to output a first control signal, and at the same time, the second control output terminal of the MCU outputs a second control signal, the third control output terminal of the MCU outputs a third control signal S, the fourth control output terminal of the MCU outputs a fourth control signal, and the fifth control output terminal of the MCU outputs a fifth control signal.

[0067] In addition, the gate chip 6 also includes an input terminal, which is connected to the second terminal of the first switch Q1, the first terminal of the second switch Q2 and the first terminal of the third switch Q3, and is used to determine whether the second switch Q2 and the third switch Q3 have received voltage.

[0068] As can be seen, this embodiment uses an MCU and a gate chip 6 to form a control module 1. The gate chip 6 uses existing technology to reduce hardware modification costs and reduce potential failure risks caused by the introduction of new devices, thus ensuring the stability and reliability of the control circuit of the photochromic glass.

[0069] As an optional embodiment, it also includes a first filtering module, the first end of which is connected to the common terminal of the control terminal of the first switching transistor Q1 and the control output terminal of the control module 1, and the second end of the first filtering module is grounded.

[0070] In this embodiment, considering that the external environment or internal components may introduce high-frequency noise and transient interference, such as high-frequency switching and electromagnetic interference, which can cause the gate control chip 6 to be falsely triggered or malfunction, a first filtering module is provided between the control output terminal of the gate control chip 6 and the control terminal of the first switching transistor Q1. Specifically, the first filtering module can be a capacitor. Further, a tenth resistor R10 is also included. The first end of the tenth resistor R10 is connected to the common terminal of the first terminal of the first filtering module, the control terminal of the first switching transistor Q1, and the first control output terminal of the control module 1. The second end of the tenth resistor R10 is connected to the control terminal of the first switching transistor Q1 for current limiting. If the control module 1 also includes an input terminal, a fourth filtering module is also included. The first end of the fourth filtering module is connected to the input terminal of the control module 1, the second end of the first switching transistor Q1, the first end of the second switching transistor Q2, and the first end of the third switching transistor Q3. The second end of the fourth filtering module is grounded. The fourth filtering module can be a fourth capacitor C2.

[0071] As can be seen, in this embodiment, a first filtering module is set between the control output terminal of the gate control chip 6 and the control terminal of the first switching transistor Q1, which enhances the anti-interference capability and reliability of the gate control chip 6.

[0072] As an optional embodiment, it further includes a second filtering module and the third filtering module; the first end of the second filtering module is connected to the second end of the second switching transistor Q2, the positive terminal of the photochromic glass 5 and the common terminal of the driving module 4, and the second end of the second filtering module is grounded; the first end of the third filtering module is connected to the second end of the third switching transistor Q3, the negative terminal of the photochromic glass 5 and the common terminal of the driving module 4, and the second end of the third filtering module is grounded.

[0073] Considering that high-frequency noise and transient interference from the external environment or switching components can affect the stability of the positive or negative voltage of the photochromic glass 5, this embodiment incorporates a second filter module and a third filter module at the positive and negative terminals of the photochromic glass 5, respectively. The second filter module smooths the voltage fluctuations output by the second switch Q2, and the third filter module smooths the voltage fluctuations output by the third switch Q3, thereby precisely controlling the degree of color change in the photochromic glass 5. Specifically, both the second and third filter modules can be capacitors.

[0074] As can be seen, in this embodiment, a second filter module and a third filter module are respectively set at the positive and negative electrodes of the photochromic glass 5, which improves the accuracy of the color change of the photochromic glass 5.

[0075] As an optional embodiment, the drive module 4 includes an eighth switch Q8 and a ninth switch Q9; the control terminal of the eighth switch Q8 is connected to the control output terminal of the control module 1, the first terminal of the eighth switch Q8 is connected to the common terminal of the second terminal of the second switch Q2 and the positive terminal of the photochromic glass 5, and the second terminal of the eighth switch Q8 is grounded; the control terminal of the ninth switch Q9 is connected to the control output terminal of the control module 1, the first terminal of the ninth switch Q9 is connected to the common terminal of the second terminal of the third switch Q3 and the negative terminal of the photochromic glass 5, and the second terminal of the ninth switch Q9 is grounded.

[0076] In this embodiment, the control terminal of the eighth switch Q8 is connected to the fourth control output terminal of the control module 1 as the first control terminal IN1 of the drive module 4, and the control terminal of the ninth switch Q9 is connected to the fifth control output terminal of the control module 1 as the second control terminal IN2 of the drive module 4. Both the eighth switch Q8 and the ninth switch Q9 can be MOSFETs. The second terminal of the eighth switch Q8 is the SOURCE1 terminal of the drive module, and the second terminal of the ninth switch Q9 is the SOURCE2 terminal of the drive module.

[0077] When the rearview mirror electrochromic glass 5 sensor detects that a color change is needed, the fourth control output terminal of the control module 1 outputs a fourth control signal. If the fourth control signal is high, the voltage at the control terminal of the eighth switch Q8 is greater than the voltage at the second terminal of the eighth switch Q8, the eighth switch Q8 is turned on, and the positive terminal of the electrochromic glass 5 is grounded through the eighth switch Q8. If the fifth control signal is high, the voltage at the control terminal of the ninth switch Q9 is greater than the voltage at the second terminal of the ninth switch Q9, the ninth switch Q9 is turned on, and the negative terminal of the electrochromic glass 5 is grounded through the ninth switch Q9.

[0078] For details, please see Figure 5 As shown, Figure 5 This is a schematic diagram of the bidirectional current flow in a photochromic glass disclosed in this utility model. When the second switch Q2 is turned on and the ninth switch Q9 is turned on, the photochromic glass 5 is forward-biased, meaning the current flows along the green line, thus causing the color of the photochromic glass 5 to darken; when the third switch Q3 is turned on and the eighth switch Q8 is turned on, the photochromic glass 5 is reverse-biased, meaning the current flows along the red line, thus causing the color of the photochromic glass 5 to lighten.

[0079] As can be seen, in this embodiment, the positive or negative ground of the photochromic glass 5 is achieved through the mutual cooperation of the eighth switch Q8 and the ninth switch Q9 being turned on or off.

[0080] As an optional embodiment, please refer to Figure 6 As shown, Figure 6This is a schematic diagram of a drive module disclosed in this utility model. It also includes a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The drive module 4 also includes a diagnostic module 7. The first end of the seventh resistor R7 is connected to the control output terminal of the control module 1, and the second end of the seventh resistor R7 is connected to the common terminal of the first end of the ninth resistor R9 and the diagnostic module 7. The first end of the eighth resistor R8 is connected to the control output terminal of the control module 1, and the second end of the eighth resistor R8 is connected to the common terminal of the first end of the ninth resistor R9 and the diagnostic module 7. The second end of the ninth resistor R9 is connected to the power supply voltage. The diagnostic module 7 is connected to the control terminals of the eighth switch Q8 and the ninth switch Q9 respectively.

[0081] It should be noted that the control output terminals of control module 1 also include a sixth control output terminal and a seventh control output terminal, and the diagnostic module 7 includes a first control terminal, a second control terminal, a first output terminal, a second output terminal, a first control output terminal, and a second control output terminal. Specifically, the first end of the seventh resistor R7 is connected to the sixth control output terminal of control module 1, and the second end of the seventh resistor R7 is connected to the common terminal of the first end of the ninth resistor R9 and the first output terminal of the diagnostic module 7; the first end of the eighth resistor R8 is connected to the seventh control output terminal of control module 1, and the second end of the eighth resistor R8 is connected to the common terminal of the first end of the ninth resistor R9 and the second output terminal of the diagnostic module 7; the first control terminal of the diagnostic module 7 serves as the first control terminal IN1 of the drive module 4 and is connected to the fourth control output terminal of control module 1, and the second control terminal of the diagnostic module 7 serves as the second control terminal IN2 of the drive module 4 and is connected to the fifth control output terminal of control module 1.

[0082] To improve the stability and safety of the control circuit of the photochromic glass, this embodiment also includes a diagnostic module 7. The functions of the diagnostic module 7 include: automatically shutting down the output when an abnormal current is detected to achieve overcurrent protection; achieving overvoltage protection through a clamping mechanism; and actively disconnecting the output when the control module 1 overheats to perform thermal shutdown protection. The first and second output terminals are used to provide real-time fault information feedback to quickly diagnose abnormalities in the control circuit of the photochromic glass. Furthermore, it also includes an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 is connected to the fourth control output terminal of the control module 1, and the second end of the eleventh resistor R11 is connected to the first control terminal IN1 of the drive module 4. The first end of the twelfth resistor R12 is connected to the fifth control output terminal of the control module 1, and the second end of the twelfth resistor R12 is connected to the second control terminal IN2 of the drive module 4. Both the eleventh resistor R11 and the twelfth resistor R12 are used for current limiting.

[0083] As can be seen, this embodiment, through the cooperation of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the diagnostic module 7, not only achieves grounding of the positive or negative terminal of the photochromic glass 5, but also provides relevant protection for the control circuit of the photochromic glass, thereby improving the stability and safety of the control circuit of the photochromic glass.

[0084] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0085] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0086] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit for photochromic glass, characterized in that, It includes a control module, a first switch drive circuit, a second switch drive circuit, a drive module, a first switch transistor, a second switch transistor, and a third switch transistor; The second end of the first switching transistor is connected to the first end of the second switching transistor and the first end of the third switching transistor; The second terminal of the second switching transistor is connected to the positive electrode of the photochromic glass and the driving module, and the control terminal of the second switching transistor is connected to the output terminal of the first switching driving circuit. The second terminal of the third switch is connected to the negative terminal of the photochromic glass and the driving module, and the control terminal of the third switch is connected to the output terminal of the second switch driving circuit. The first terminal of the first switching transistor is connected to the power output terminal of the control module. The control terminal of the first switching transistor, the input terminal of the first switching drive circuit, the input terminal of the second switching drive circuit, and the drive module are all connected to the control output terminal of the control module. The drive module is used to drive the photochromic glass to ground at the negative or positive terminal based on the control of the control module.

2. The control circuit for photochromic glass as described in claim 1, characterized in that, The first switch driving circuit includes a fourth switch transistor, a fifth switch transistor, a first resistor, a second resistor, and a third resistor; The first end of the first resistor is connected to the control output end of the control module as the input end of the first switch driving circuit, and the second end of the first resistor is connected to the control end of the fourth switch. The first terminal of the fourth switch is grounded, and the second terminal of the fourth switch is connected to the first terminal of the second resistor; The second end of the second resistor is connected to the control terminal of the fifth switching transistor; The first terminal of the fifth switch is connected to the power supply voltage, and the second terminal of the fifth switch is connected to the first terminal of the third resistor; The second end of the third resistor is connected to the control terminal of the second switching transistor.

3. The control circuit for photochromic glass as described in claim 1, characterized in that, The second switch driving circuit includes a sixth switch transistor, a seventh switch transistor, a fourth resistor, a fifth resistor, and a sixth resistor; The first end of the fourth resistor is connected to the control output end of the control module as the input end of the second switch driving circuit, and the second end of the fourth resistor is connected to the control end of the sixth switch. The first terminal of the sixth switch is grounded, and the second terminal of the sixth switch is connected to the first terminal of the fifth resistor; The second end of the fifth resistor is connected to the control terminal of the seventh switch transistor; The first terminal of the seventh switch is connected to the power supply voltage, and the second terminal of the seventh switch is connected to the first terminal of the sixth resistor; The second end of the sixth resistor is connected to the control terminal of the third switch.

4. The control circuit for photochromic glass as described in claim 1, characterized in that, The control module includes an MCU and a gating chip; The MCU is connected to the gate control chip, the input terminal of the first switch driving circuit, the input terminal of the second switch driving circuit, and the driving module respectively. The gate control chip is connected to the first terminal of the first switching transistor and the control terminal of the first switching transistor, respectively.

5. The control circuit for photochromic glass as described in claim 1, characterized in that, It also includes a first filtering module, the first end of which is connected to the common terminal of the control terminal of the first switching transistor and the control output terminal of the control module, and the second end of the first filtering module is grounded.

6. The control circuit for photochromic glass as described in claim 5, characterized in that, The first filtering module is a capacitor.

7. The control circuit for photochromic glass as described in claim 1, characterized in that, It also includes a second filtering module and a third filtering module; The first terminal of the second filter module is connected to the second terminal of the second switching transistor, the positive electrode of the photochromic glass, and the common terminal of the driving module, and the second terminal of the second filter module is grounded. The first terminal of the third filter module is connected to the second terminal of the third switch, the negative terminal of the photochromic glass, and the common terminal of the drive module, and the second terminal of the third filter module is grounded.

8. The control circuit for photochromic glass as described in claim 7, characterized in that, Both the second and third filtering modules are capacitors.

9. The control circuit for photochromic glass as described in any one of claims 1 to 8, characterized in that, The drive module includes an eighth switch and a ninth switch; The control terminal of the eighth switch is connected to the control output terminal of the control module, the first terminal of the eighth switch is connected to the common terminal of the second terminal of the second switch and the positive terminal of the photochromic glass, and the second terminal of the eighth switch is grounded. The control terminal of the ninth switch is connected to the control output terminal of the control module. The first terminal of the ninth switch is connected to the common terminal of the second terminal of the third switch and the negative terminal of the photochromic glass. The second terminal of the ninth switch is grounded.

10. The control circuit for photochromic glass as described in claim 9, characterized in that, It also includes a seventh resistor, an eighth resistor, and a ninth resistor, and the drive module also includes a diagnostic module; The first end of the seventh resistor is connected to the control output terminal of the control module, and the second end of the seventh resistor is connected to the common terminal of the first end of the ninth resistor and the diagnostic module. The first end of the eighth resistor is connected to the control output terminal of the control module, and the second end of the eighth resistor is connected to the common terminal of the first end of the ninth resistor and the diagnostic module. The second terminal of the ninth resistor is connected to the power supply voltage; The diagnostic module is connected to the control terminal of the eighth switch and the control terminal of the ninth switch, respectively.

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