Dimming glass driving circuit, dimming glass driving device and dimming system

Abstract

The utility model discloses a driving circuit, device and dimming system of dimming glass, and relates to the circuit field, a processor outputs a preset square wave signal to a first voltage output module through a first control output end so as to control the output voltage output by the first voltage output module to a first driving end of a dimming subarea; meanwhile, a preset square wave signal is output to a second voltage output module through a second control output end so as to control the output voltage, output to a second driving end of the dimming subarea, of the second voltage output module; the processor adjusts the phase difference between the preset square wave signal output to the corresponding first voltage output module and the preset square wave signal output to the second voltage output module according to the dimming requirement, and achieves the process of outputting different voltages to the dimming subarea through the different phase differences between the square wave signals. Therefore, the transparency of each dimming subarea can be independently adjusted.

Description

Technical Field

[0001] The utility model relates to the field of circuits, in particular to a driving circuit, a device and a dimming system for dimming glass. Background Technique

[0002] Dimming glass has been widely used in the automotive field. Dimming glass is a new type of optoelectronic glass with a sandwich structure formed by laminating a dimming glass film between two layers of glass and integrally molding it through high-temperature and high-pressure glue. The dimming glass film can be switched between transparent and opaque by adjusting the voltage. Users can adjust the visibility of the window glass by adjusting the voltage output to the dimming glass, protecting the privacy of members. Especially when there are multiple partitions in the dimming glass, multiple output voltages are required to separately adjust the visibility of the dimming glass in each partition. Therefore, how to provide an independently adjustable driving voltage for each partition of the dimming glass has become a technical problem that urgently needs to be solved at present. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a driving circuit, a device and a dimming system for dimming glass. When a certain dimming partition needs to be dimmed, the processor adjusts the phase difference between the preset square wave signal output to the corresponding first voltage output module and the preset square wave signal output to the second voltage output module according to the dimming requirement, and uses the different phase differences between the square wave signals to realize the process of outputting different magnitudes of voltage to the dimming partition, so as to realize the independent adjustment of the transparency of each dimming partition.

[0004] To solve the above technical problem, the utility model provides a driving circuit for dimming glass, including:

[0005] A plurality of first voltage output modules respectively connected to a plurality of dimming partitions of the dimming glass, the input end of the first voltage output module is connected to the power supply, the output end is connected to the first driving end of its corresponding dimming partition, and the control end is connected to the first control output end of the processor, and is used to output a first voltage that is consistent with or has a phase opposite to the preset square wave signal received by itself based on the power supply;

[0006] A second voltage output module, the input end is connected to the power supply, the output end is respectively connected to the second driving ends of a plurality of the dimming partitions, and the control end is connected to the second control output end of the processor, and is used to output a second voltage that is consistent with or has a phase opposite to the preset square wave signal received by itself based on the power supply;

[0007] The processor is used to output different preset square wave signals to the first voltage output module and the second voltage output module.

[0008] Optionally, the first voltage output module includes:

[0009] A plurality of first current limiting modules respectively connected to a plurality of dimming zones of the dimming glass, with the first end of the first current limiting module connected to the power supply;

[0010] A plurality of zone control switches respectively connected to a plurality of dimming zones of the dimming glass, with the first end of the zone control switch respectively connected to the second end of the first current limiting module and the first driving end of its corresponding dimming zone, the second end grounded, and the control end connected to the first control output end of the processor, and being used to conduct when receiving a first level signal and turn off when receiving a second level signal; the first level signal and the second level signal are opposite.

[0011] Optionally, the second voltage output module includes:

[0012] A second current limiting module, with the first end connected to the power supply;

[0013] A common control switch, with the first end respectively connected to the second end of the second current limiting module and the second driving ends of a plurality of the dimming zones, the second end grounded, and the control end connected to the second control output end of the processor, and being used to conduct when receiving a first level signal and turn off when receiving a second level signal.

[0014] Optionally, it further includes:

[0015] A first one-way conduction module, with the positive pole connected to the power supply and the negative pole respectively connected to the first ends of a plurality of the first current limiting modules and the first end of the second current limiting module.

[0016] Optionally, it further includes:

[0017] A second one-way conduction module respectively connected to a plurality of the zone control switches, with the positive pole of the second one-way conduction module connected to the second end of the corresponding zone control switch and the negative pole connected to the first end of the corresponding zone control switch.

[0018] Optionally, it further includes:

[0019] A third one-way conduction module, with the positive pole connected to the second end of the common control switch and the negative pole connected to the first end of the common control switch.

[0020] Optionally, it further includes:

[0021] A plurality of first voltage sampling modules respectively connected to a plurality of the first voltage output modules, with the first input end connected to the first driving end of the corresponding dimming zone, the second input end grounded, and the output end connected to the input end of the processor, and being used to collect the voltage output by the corresponding first voltage output module in real time;

[0022] A second voltage sampling module correspondingly connected to the second voltage output module, with a first input terminal connected to the output terminal of the second voltage output module, a second input terminal grounded, and an output terminal connected to the input terminal of the processor, for real-time sampling of the voltage output by the second voltage output module.

[0023] Optionally, the first voltage sampling module includes:

[0024] A first sampling resistor, with its first end connected to the first driving end of the corresponding dimming zone;

[0025] A second sampling resistor, with its first end connected to the second end of the first sampling resistor and the input terminal of the processor respectively, and its second end grounded.

[0026] To solve the above technical problems, the present invention also provides a driving device for a dimming glass, including a power supply and the driving circuit of the dimming glass as described above, and the power supply is connected to the driving circuit of the dimming glass.

[0027] To solve the above technical problems, the present invention also provides a dimming system, including a dimming glass and the driving device of the dimming glass as described above, and the driving end of the dimming glass is connected to the driving device of the dimming glass.

[0028] The present invention provides a driving circuit for a dimming glass, including a processor, a second voltage output module, and a plurality of first voltage output modules. The processor outputs a preset square wave signal to the first voltage output module through a first control output terminal to control the output voltage of the first voltage output module to the first driving end of the dimming zone, and at the same time outputs a preset square wave signal to the second voltage output module through a second control output terminal to control the output voltage of the second voltage output module to the second driving end of the dimming zone. When a certain dimming zone needs to be dimmed, the processor adjusts the phase difference between the preset square wave signal output to the corresponding first voltage output module and the preset square wave signal output to the second voltage output module according to the dimming requirement, and uses different phase differences between the square wave signals to realize the process of outputting different magnitudes of voltage to the dimming zone, so as to realize the independent adjustment of the transparency of each dimming zone.

[0029] The present invention also provides a driving device and a dimming system for a dimming glass, which have the same beneficial effects as the above driving circuit of the dimming glass. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the prior art and the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of the structure of a driving circuit for a dimming glass provided by the present invention;

[0032] Figure 2 Schematic diagram of the structure of a driving circuit for a dimming glass with one dimming zone provided by the present invention;

[0033] Figure 3 Schematic diagram of the structure of another driving circuit for a dimming glass with one dimming zone provided by the present invention;

[0034] Figure 4 Schematic diagram of the structure of a driving circuit for a dimming glass with three dimming zones provided by the present invention;

[0035] Figure 5 Schematic diagram of the voltage signal waveform of the first driving circuit for a dimming glass provided by the present invention;

[0036] Figure 6 Schematic diagram of the voltage signal waveform of the second driving circuit for a dimming glass provided by the present invention;

[0037] Figure 7 Schematic diagram of the voltage signal waveform of the third driving circuit for a dimming glass provided by the present invention. Detailed implementation manners

[0038] The core of the present invention is to provide a driving circuit, device, and dimming system for a dimming glass. When a certain dimming zone needs to be dimmed, the processor adjusts the phase difference between the preset square wave signal output to the corresponding first voltage output module and the preset square wave signal output to the second voltage output module according to the dimming requirement, and uses different phase differences between the square wave signals to realize the process of outputting different magnitudes of voltage to the dimming zone, thereby realizing the independent adjustment of the transparency of each dimming zone.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a driving circuit for a dimming glass provided by the present utility model; to solve the above technical problems, the present utility model provides a driving circuit for a dimming glass, including:

[0041] A plurality of first voltage output modules 1 respectively connected to a plurality of dimming zones of the dimming glass. The input end of the first voltage output module 1 is connected to the power supply V_HV, the output end is connected to the first driving end of its corresponding dimming zone, and the control end is connected to the first control output end of the processor MCU, and is used to output a first voltage based on the power supply that is consistent with or has a phase opposite to the preset square wave signal waveform received by itself;

[0042] A second voltage output module 2, with the input end connected to the power supply and the output end respectively connected to the second driving ends of a plurality of dimming zones, and the control end connected to the second control output end of the processor MCU, and is used to output a second voltage based on the power supply that is consistent with or has a phase opposite to the preset square wave signal waveform received by itself;

[0043] A processor MCU, which is used to output different preset square wave signals to the first voltage output module 1 and the second voltage output module 2.

[0044] It can be understood that for a dimming glass, especially for a dimming film made of PDLC (Polymer Dispersed Liquid Crystal), dimming is generally achieved by applying voltages simultaneously at both ends of the dimming film to drive the dimming film. When the voltage amplitude changes, the transparency and haze of the dimming film also change accordingly to achieve the purpose of dimming. Therefore, for each dimming partition in the dimming glass or the dimming glass itself, there is a first driving end located at the first end of the dimming film and a second driving end located at the second end of the dimming film. The driving circuit needs to output two output voltages simultaneously to the first driving end and the second driving end respectively to drive the corresponding dimming glass or dimming partition for dimming. To simplify the driving circuit of the dimming glass, the present application respectively provides a first voltage output module 1 and a second voltage output module 2. The number of the first voltage output modules 1 is the same as the number of the dimming partitions in the dimming glass. The output ends of the respective first voltage output modules 1 are respectively connected in one-to-one correspondence with the first driving ends of the respective dimming partitions to provide a first voltage for driving the dimming of the respective dimming partitions. At the same time, the second driving ends of all the dimming partitions are connected to the output end of the second voltage output module 2, and the second voltage output module 2 simultaneously provides a second voltage for driving the dimming of all the dimming partitions. The second voltage serves as the common driving voltage for each dimming partition. The processor MCU only needs to control the respective first voltage output modules 1 to output different voltages to achieve the independent adjustment process of each dimming partition.

[0045] It is not difficult to understand that, in order to further reduce costs and achieve a simple and reliable dimming process, the present application adopts a method of driving PDLC with a square wave to adjust the transparency of the dimming glass. By applying a periodic square wave voltage waveform across the PDLC, the transparency of the PDLC is adjusted. For a certain dimming zone, the processor MCU outputs a first square wave signal to its corresponding first voltage output module 1. The output voltage of the first voltage output module 1 changes with the voltage change of the first square wave signal. The output voltage of the first voltage output module 1 is consistent with the signal waveform of the first square wave signal or has a completely opposite phase, differing only in the voltage magnitude; it outputs a second square wave signal to its corresponding second voltage output module 2. The output voltage of the second voltage output module 2 changes with the voltage change of the second square wave signal. The output voltage of the second voltage output module 2 is consistent with the signal waveform of the second square wave signal or has a completely opposite phase, differing only in the voltage magnitude; the first square wave signal and the second square wave signal are two preset square wave signals, and the effective value of the voltage across the dimming zone changes with the change of the phase difference between the two. The processor MCU can adjust the phase difference between the first square wave signal and the second square wave signal to achieve the dimming process of the dimming zone and the dimming glass. The processor MCU outputting different preset square wave signals to the first voltage output module 1 and the second voltage output module 2 means that the processor MCU will output multiple preset square wave signals to the second voltage output module 2 and each first voltage output module 1 respectively. The phases of these preset square wave signals may be the same or different. For example, when there are N dimming zones, where N is a positive integer, the processor MCU will output N + 1 preset square wave signals. The N + 1 preset square wave signals are respectively output to the second voltage output module 2 and N first voltage output modules 1. The waveforms of these N + 1 preset square wave signals may be consistent or there may be a phase difference, but the frequencies of each preset square wave signal will remain the same, and there may only be a phase difference. The phase difference arrangement for the N + 1 preset square wave signals needs to be set and adjusted according to the dimming requirements of each dimming zone. The present application does not make a special limitation here.

[0046] It should be noted that the specific types and implementation manners of the first voltage output module 1, the second voltage output module 2, and the processor MCU are not particularly limited in this application. The first voltage output module 1 and the second voltage output module 2 only function to convert the preset square wave signal output by the processor MCU to a voltage value capable of driving the dimming glass, and the voltage waveform can still be consistent with the square wave signal received by itself or have a completely opposite phase. The specific types and implementation manners of the power supply and the preset square wave signal are not particularly limited in this application. The preset square wave signal is a square wave signal that varies between a first level signal and a second level signal. The specific value and selection of the power supply need to be selected and adjusted according to the level and magnitude of the driving voltage required by the dimming glass. The number of dimming partitions set in the dimming glass, the specific type of the dimming glass, the implementation manner, etc. are not particularly limited in this application and can be selected and adjusted according to actual application requirements.

[0047] As a specific embodiment, please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a driving circuit for a dimming glass with one dimming partition provided by the present utility model; please refer to Figure 3 , Figure 3 which is another schematic structural diagram of a driving circuit for a dimming glass with one dimming partition provided by the present utility model; in the figure, VCC represents the power supply voltage for the processor MCU, V_HV is the power supply, and the power supply is specifically implemented by a voltage source with an output voltage of V_HV; taking the example where the dimming glass only has one entire dimming partition, as Figure 2As shown, the output pin P1.1 of the processor MCU is connected to the input end of the first voltage output module 1, and the output pin P1.2 is connected to the input end of the second voltage output module 2. The first voltage output module 1 is implemented by the series-connected MOS transistor M1 and resistor R1, and the second voltage output module 2 is implemented by the series-connected MOS transistor M4 and resistor R4. The on-off of the MOS transistor M1 can be controlled through P1.1 of the MCU. When P1.1 is set high, M1 is turned on, and the output OUTPUT-1 is at a low level; when P1.1 is set low, M1 is turned off, and the output OUTPUT-1 is at a high level. Thus, the first voltage output module 1 can output a first voltage that is completely opposite in phase to the square wave signal received by itself. Similarly, OUTPUT-4 can also output a square wave voltage of the same frequency, and the second voltage output module 2 also outputs a second voltage that is completely opposite in phase to the square wave signal received by itself. When the phase difference between the output voltages of OUTPUT-1 and OUTPUT-4 is 0, the voltage difference across PDLC-1 is 0, and at this time, the transparency is the lowest and the haze is the highest. When the phase difference between the output voltages of OUTPUT-1 and OUTPUT-4 is 180°, a square wave voltage is applied across PDLC-1, and at this time, the transparency of this PDLC-1 is the highest and the haze is the lowest.

[0048] It can be understood that, please refer to Figure 4 , Figure 4 is a schematic structural diagram of a driving circuit for a dimming glass with three dimming zones provided by the present invention; when there are multiple dimming zones in the dimming glass, the driving circuit needs to drive the multi-zone PDLC. At this time, one path of driving is used to connect one end of multiple zones as the common end, that is, the second driving end corresponding to the second voltage output module 2, and other driving circuits are respectively connected to the other ends of each zone, that is, the first driving ends corresponding to the first voltage output module 1. As Figure 4As shown, the common terminal of the three dimming zones is OUTPUT-4, which outputs a fixed driving voltage square wave waveform to the second driving terminals of the three zones. OUTPUT-1, OUTPUT-2, and OUTPUT-3 are respectively connected to the other ends of the three zones. OUTPUT-1, OUTPUT-2, OUTPUT-3, and OUTPUT-4 output four square wave voltages with the same frequency. When the phase of the output voltage OUTPUT-1 or OUTPUT-2 or OUTPUT-3 is different from that of the common terminal, the voltages across the corresponding PDLCs are also different. Thus, by changing the phase difference between OUTPUT-1 or OUTPUT-2 or OUTPUT-3 and the common terminal, the voltages across the corresponding PDLCs are adjusted, indirectly adjusting the effective voltages on both sides of PDLC-1, PDLC-2, and PDLC-3, and further adjusting the transparency of each PDLC zone individually. The working processes of the voltage output modules corresponding to OUTPUT-1 and OUTPUT-4 are similar to those described above. Only four driving circuits are needed to control the three zones, which can effectively reduce the required driving circuits compared with the usual driving method. The working processes of the voltage output modules corresponding to OUTPUT-2 and OUTPUT-3 are similar to that of the voltage output module corresponding to OUTPUT-1, and will not be elaborated herein.

[0049] It is not difficult to understand that during the dimming control process of each PDLC zone, the transparency of the PDLC is related to the effective value of the periodic voltage applied across its two sides. Therefore, a relationship table between transparency and effective voltage can be formulated in advance according to practical experience. When the periodic effective voltage across the corresponding dimming zone is stable, the dimming zone is in a stable transparent state. Therefore, the effective voltage can be further maintained at a stable value by setting a control strategy. First, the voltages across both sides of the dimming zone can be detected in real time, and the real-time effective voltage value of each cycle can be calculated , and the deviation from the set value of the effective voltage can be calculated . When square wave voltages with the same frequency are applied across both sides of the PDLC, when the phases of the two square wave voltages are 0, the effective voltage across the two ends is 0, and when the phase difference of the voltages is 180°, the effective voltage is the maximum. Accordingly, the phase difference is used to control the effective voltage across both ends of the PDLC zone.

[0050] As a specific embodiment, the voltages V1 and V common terminal across both ends of PDLC-1 can be collected in real time during operation. They are collected N times in one cycle. Then, the driving voltage V of PDLC-1 = V1 - V common terminal, and then the effective value of the driving voltage is calculated : , where T is the period of the preset square wave signal, is the real-time value of the driving voltage of PDLC-1, and t is the moment; to reduce the calculation amount, can be used during actual control adjustment to replace as the effective value of the driving voltage, and then use this effective value to update the .

[0051] It is not difficult to understand that the present application provides a method of controlling multiple PDLC glasses on an automobile by phase modulation, so as to simplify the driving circuit, reduce costs, and improve the stability of the driving power supply. The driving circuit of the dimming glass provided can effectively simplify the hardware circuit of the driving dimming glass, realize the use of fewer MCU (Microcontroller Unit) resources, reduce costs, and can be used to adjust the permeability of PDLC multi-zone dimming glass, and is applied to dimming glass fields such as automotive dimming glass. By changing the voltage output mode and circuit, the high-frequency carrier required for driving is cancelled, greatly reducing the EMC (Electro Magnetic Compatibility) of the controller. In the case of multi-zone driving of PDLC, by adopting the method of sharing a common driving circuit by multiple PDLCs, the number of driving circuits can be effectively reduced, the circuit complexity can be reduced, and the cost can be reduced. The voltage across the PDLC can be further adjusted and dynamically feedback adjusted to make the voltage across each PDLC stable, so that the transparency of the PDLC is adjustable and in a stable transparency state.

[0052] It should be further noted that the present application utilizes the characteristics of square-wave driving to realize a new driving circuit for dimming glass. Please refer to Figure 5 , Figure 5 which is the schematic diagram of the voltage signal waveform of the first driving circuit of the dimming glass provided by the present utility model; please refer to Figure 6 , Figure 6 which is the schematic diagram of the voltage signal waveform of the second driving circuit of the dimming glass provided by the present utility model; please refer to Figure 7 , Figure 7 which is the schematic diagram of the voltage signal waveform of the third driving circuit of the dimming glass provided by the present utility model. When the phases of the input voltages received at both ends of the dimming glass are different, the change of the voltage waveform across the PDLC is as shown in Figure 5 , Figure 6 and Figure 7 . Figure 5 is the schematic diagram of the waveforms of the first voltage, the second voltage, and the driving voltage across the dimming zone when the phase difference between the first voltage and the second voltage is 0; Figure 6 is the schematic diagram of the waveforms of the first voltage, the second voltage, and the driving voltage across the dimming zone when the phase difference between the first voltage and the second voltage is 90°; Figure 7It is a waveform schematic diagram of the first voltage, the second voltage, and the driving voltage across the dimming zone when the phase difference between the first voltage and the second voltage is 180°.

[0053] The present invention provides a driving circuit for a dimming glass, which includes a processor MCU, a second voltage output module 2, and a plurality of first voltage output modules 1. The processor MCU outputs a preset square wave signal to the first voltage output module 1 through the first control output terminal to control the output voltage of the first voltage output module 1 to the first driving terminal of the dimming zone. At the same time, it outputs a preset square wave signal to the second voltage output module 2 through the second control output terminal to control the output voltage of the second voltage output module 2 to the second driving terminal of the dimming zone. When a certain dimming zone needs to be dimmed, the processor MCU adjusts the phase difference between the preset square wave signal output to the corresponding first voltage output module 1 and the preset square wave signal output to the second voltage output module 2 according to the dimming requirement, and uses different phase differences between the square wave signals to realize the process of outputting different magnitudes of voltage to the dimming zone, so as to independently adjust the transparency of each dimming zone.

[0054] As an optional embodiment, the first voltage output module 1 includes:

[0055] A plurality of first current limiting modules respectively connected to a plurality of dimming zones of the dimming glass, and the first end of the first current limiting module is connected to the power supply;

[0056] A plurality of zone control switches respectively connected to a plurality of dimming zones of the dimming glass. The first end of the zone control switch is respectively connected to the second end of the first current limiting module and the first driving terminal of its corresponding dimming zone, the second end is grounded, and the control end is connected to the first control output terminal of the processor MCU, and is used to conduct when receiving the first level signal and turn off when receiving the second level signal; the first level signal and the second level signal are opposite.

[0057] It is not difficult to understand that the first voltage output module 1 can be implemented by a partition control switch and a first current limiting module connected in series. The partition control switch will be turned on or off under the action of a preset square wave signal output by the processor MCU. When the partition control switch is turned on, the voltage of the first driving end of the corresponding connected dimming partition will be pulled down to ground. When the partition control switch is turned off, the voltage of the first driving end of the corresponding connected dimming partition will be pulled up to the output voltage of the power supply. When the first level signal is a high level signal, a first voltage with a phase exactly opposite to that of the preset square wave signal (phase difference of 180°) can be generated. When the first level signal is a low level signal, a first voltage with a waveform exactly the same as that of the preset square wave signal can be generated. The specific implementation methods of the first level signal and the second level signal are not particularly limited in this application. To ensure the safety of the partition control switch, a suitable first current limiting module needs to be selected on each drive circuit so that when the partition control switch is turned on and the first voltage output is low, the current can be limited within a reasonable range to avoid overcurrent and other situations. And because the capacitance value of the PDLC material itself is very small, the rise time and fall time of the first voltage are approximately equal. The specific types and implementation methods of the first current limiting module and the partition control switch are not particularly limited in this application. The first current limiting module can be implemented by a resistor, and the partition control switch can be implemented by a switching device such as a MOS transistor. As Figure 4 shown, there are a first voltage output module 1 composed of a resistor R1 and a MOS transistor M1, a first voltage output module 1 composed of a resistor R2 and a MOS transistor M2, and a first voltage output module 1 composed of a resistor R3 and a MOS transistor M3.

[0058] Specifically, when driving the dimming glass, one-way voltage output can be driven by a MOS transistor, and the process of converting the preset square wave signal into the first voltage is realized by controlling the on or off of the partition control switch connected to the power supply. The circuit structure is simple and easy to implement, which can effectively reduce the cost of the entire drive circuit and is beneficial to the simple implementation of the entire drive circuit.

[0059] As an optional embodiment, the second voltage output module 2 includes:

[0060] A second current limiting module, the first end of which is connected to the power supply;

[0061] A common control switch, the first end of which is respectively connected to the second end of the second current limiting module and the second driving ends of several dimming partitions, the second end of which is grounded, and the control end of which is connected to the second control output end of the processor MCU, and is used to be turned on when receiving the first level signal and turned off when receiving the second level signal.

[0062] It can be understood that the second voltage output module 2 has a working principle similar to that of the first voltage output module 1, so it can be implemented by the same circuit structure. The second voltage output module 2 can also be implemented by a common control switch and a second current limiting module connected in series. The common control switch will be turned on or off under the action of a preset square wave signal output by the processor MCU. When the common control switch is turned on, the voltage of the second drive ends of all dimming zones will be pulled down to ground. When the common control switch is turned off, the voltage of the second drive ends of all dimming zones will be pulled up to the output voltage of the power supply. At the same time, in order to ensure the safety of the common control switch, a second current limiting module is also provided in the circuit to limit the current within a reasonable range and avoid overcurrent and other situations. The specific types and implementation methods of the second current limiting module and the common control switch are not particularly limited in this application. The second current limiting module can be implemented by a resistor, and the common control switch can be implemented by a switching device such as a MOS transistor. As Figure 4 shown, the second voltage output module 2 is composed of a resistor R4 and a MOS transistor M4.

[0063] Specifically, the method of outputting the voltage of the drive circuit based on a current limiting module and a switching device connected in series is relatively simple. In each drive circuit, only one MOS power device is required to control the output voltage, and no high-frequency switching action is required, reducing the EMC impact. The circuit structure is simple and easy to implement, which can effectively reduce the cost of the entire drive circuit and is conducive to the simple implementation of the entire drive circuit.

[0064] As an optional embodiment, it further includes:

[0065] A first one-way conduction module D1, with the positive electrode connected to the power supply and the negative electrode connected to the first ends of a plurality of first current limiting modules and the first end of the second current limiting module respectively.

[0066] It is not difficult to understand that considering that when the partition control switch or the common control switch is turned off, the power supply will be directly connected to the drive end of the dimming zone through the first current limiting module or the second current limiting module. In order to avoid current backflow and other situations during the generation of the drive voltage by the power supply, a first one-way conduction module D1 can also be added on the output side of the power supply to specify the current flow direction. The specific type and implementation method of the first one-way conduction module D1 are not particularly limited in this application and can be implemented by a diode or other means.

[0067] Specifically, a series-connected first one-way conduction module D1 can be added to the circuit to ensure the current flow direction during the drive process, thereby further protecting the current and ensuring that the first voltage output module 1 and the second voltage output module 2 can effectively output accurate drive voltages to both ends of the dimming zone, improving the safety and reliability of the entire drive circuit.

[0068] As an alternative embodiment, it further includes:

[0069] A second one-way conduction module D2 connected in one-to-one correspondence with a plurality of partition control switches, the positive electrode of the second one-way conduction module D2 is connected to the second end of the corresponding partition control switch, and the negative electrode is connected to the first end of the corresponding partition control switch.

[0070] It can be understood that, in order to avoid possible leakage of the partition control switch, especially when the partition control switch is implemented by a MOS transistor, there is a possibility of leakage between its source and drain. Therefore, a second one-way conduction module D2 connected in parallel can be further provided at both ends of the partition control switch. The specific type and implementation manner of the second one-way conduction module D2 are not particularly limited in this application, and it can be implemented by a diode or other means.

[0071] Specifically, a second one-way conduction module D2 connected in reverse parallel can be added at both ends of the partition control switch to prevent possible leakage in the circuit, thereby avoiding errors in the first voltage output to the first driving end of the dimming switch. At the same time, it can also protect the partition control switch when there is an excessive abnormal voltage in the circuit, improving the safety and reliability of the entire driving circuit.

[0072] As an alternative embodiment, it further includes:

[0073] A third one-way conduction module D3, the positive electrode is connected to the second end of the common control switch, and the negative electrode is connected to the first end of the common control switch.

[0074] It can be understood that, similar to the partition control switch, a third one-way conduction module D3 connected in parallel can be further provided at both ends of the common control switch, thereby avoiding possible leakage of the common control switch. The specific type and implementation manner of the third one-way conduction module D3 are not particularly limited in this application, and it can be implemented by a diode or other means.

[0075] Specifically, a third one-way conduction module D3 connected in reverse parallel can be added at both ends of the common control switch to prevent possible leakage in the circuit, thereby avoiding errors in the first voltage output to the second driving end of the dimming switch. At the same time, it can also protect the common control switch when there is an excessive abnormal voltage in the circuit, improving the safety and reliability of the entire driving circuit.

[0076] As an alternative embodiment, it further includes:

[0077] A plurality of first voltage sampling modules respectively connected to a plurality of first voltage output modules 1, with the first input terminal connected to the first driving terminal of the corresponding dimming zone, the second input terminal grounded, and the output terminal connected to the input terminal of the processor MCU, for collecting in real time the voltage output by the corresponding first voltage output module 1;

[0078] A second voltage sampling module correspondingly connected to the second voltage output module 2, with the first input terminal connected to the output terminal of the second voltage output module 2, the second input terminal grounded, and the output terminal connected to the input terminal of the processor MCU, for collecting in real time the voltage output by the second voltage output module 2.

[0079] It is not difficult to understand that during the process of driving the dimming zone, it is best to ensure the stability of the first voltage output to the first driving terminal of the dimming zone and the second voltage output to the second driving terminal. Therefore, voltage sampling modules can also be added at both ends of the dimming zone to detect in real time the voltage conditions output to the two driving terminals of each dimming zone, so as to perform subsequent operations to maintain voltage stability, and at the same time, it can further ensure that the driving voltage obtained by the dimming zone can meet the dimming requirements. For the convenience of identification and control, voltage sampling modules are respectively connected to the first driving terminal and the second driving terminal of each dimming zone. The specific types and implementation methods of the first voltage sampling module and the second voltage sampling module are not particularly limited in this application, and can be implemented by means of voltage sensors or voltage dividing circuits, etc.

[0080] Specifically, in order to facilitate the real-time detection of the driving voltage received by each dimming zone and perform voltage control, voltage sampling modules correspondingly connected to the second voltage sampling module and each first voltage sampling module can also be added, so as to ensure the accuracy and reliability of the driving voltage output by the driving circuit to each dimming zone.

[0081] As an optional embodiment, the first voltage sampling module includes:

[0082] A first sampling resistor, with the first end connected to the first driving terminal of the corresponding dimming zone;

[0083] A second sampling resistor, with the first end respectively connected to the second end of the first sampling resistor and the input terminal of the processor MCU, and the second end grounded.

[0084] It can be understood that the first voltage sampling module can specifically be implemented by a voltage dividing circuit including a first sampling resistor and a second sampling resistor. The second voltage sampling module can also be implemented by a similar voltage dividing circuit structure, such as Figure 4As shown, a voltage-dividing resistor is introduced at the output end of each output voltage, that is, at the output ends of each first voltage output module 1 and the output end of the second voltage output module 2. The voltage is sampled using different AD pins of the MCU. The voltage at the first driving end of the dimming partition PDLC-1 is fed back to the P2.1 pin of the processor MCU, the voltage at the first driving end of the dimming partition PDLC-2 is fed back to the P2.2 pin of the processor MCU, the voltage at the first driving end of the dimming partition PDLC-3 is fed back to the P2.3 pin of the processor MCU, and the voltage at the second driving ends of the three dimming partitions is fed back to the P2.4 pin of the processor MCU. As Figure 4 shown, a resistor R5 and a resistor R6 are set to collect the voltage V at the first driving end of the dimming partition PDLC-1 AD-1 , a resistor R7 and a resistor R8 are set to collect the voltage V at the first driving end of the dimming partition PDLC-2 AD-2 , a resistor R9 and a resistor R10 are set to collect the voltage V at the first driving end of the dimming partition PDLC-3 AD-3 , a resistor R11 and a resistor R12 are set to collect the voltage V at the second driving end of the dimming partition AD-4 . Taking the voltage across PDLC-1 as an example: , , where is the output voltage at the output end OUTPUT-1 of the first voltage output module of the first path, that is, the voltage output from the MOS transistor M1 and the resistor R1 to the first driving end of PDLC-1; is the output voltage at the output end OUTPUT-4 of the second voltage output module, that is, the voltage output from the MOS transistor M4 and the resistor R4 to the second driving end of PDLC-1.

[0085] After acquisition and calculation, the voltages on both sides of PDLC-1 are respectively V AD-1 , V AD-4 . Then the effective voltage across PDLC-1 is: . Thus, during actual dimming, when the effective voltage corresponding to a certain light transmittance is known, it is only necessary to maintain the stability of the effective voltage on both sides of the PDLC during dimming.

[0086] Specifically, the voltage sampling module can be specifically implemented by a voltage-dividing circuit formed by two resistors in series. While real-time collecting the driving voltage received by the dimming partition, it can reduce the driving voltage to a certain extent for the processor MCU to receive; and the entire circuit structure is simple and easy to implement.

[0087] To solve the above technical problems, the present utility model also provides a driving device for a dimming glass, including a power supply and the driving circuit of the dimming glass as described above, and the power supply is connected to the driving circuit of the dimming glass.

[0088] For the introduction of a driving device of a dimming glass provided by the present utility model, please refer to the embodiments of the driving circuit of the dimming glass described above, and the present utility model will not be elaborated herein.

[0089] To solve the above technical problems, the present utility model further provides a dimming system, which includes a dimming glass and the driving device of the dimming glass as described above, and the driving end of the dimming glass is connected to the driving device of the dimming glass.

[0090] For the introduction of a dimming system provided by the present utility model, please refer to the embodiments of the driving circuit of the dimming glass described above, and the present utility model will not be elaborated herein.

[0091] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0092] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A driving circuit for dimming glass, characterized in that: include: A plurality of first voltage output modules connected to the plurality of dimming zones of the dimming glass in one-to-one correspondence, wherein the input end of the first voltage output module is connected to the power supply, the output end is connected to the first driving end of the dimming zone corresponding to itself, and the control end is connected to the first control output end of the processor, and is used for outputting a first voltage having a waveform consistent with or opposite to the phase of a preset square wave signal received by itself based on the power supply; A second voltage output module, the input end of which is connected to the power supply, the output end of which is respectively connected to the second driving ends of the plurality of dimming partitions, and the control end of which is connected to the second control output end of the processor, and is used to output a second voltage having a waveform consistent with or opposite phase to the preset square wave signal received by itself based on the power supply; The processor is used to output different preset square wave signals to the first voltage output module and the second voltage output module.

2. The driving circuit of the dimming glass according to claim 1, characterized in that: The first voltage output module comprises: A plurality of first current limiting modules connected to the plurality of dimming zones of the dimming glass in a one-to-one correspondence, wherein the first ends of the first current limiting modules are connected to the power supply; A plurality of zone control switches are connected in one-to-one correspondence with the plurality of dimming zones of the dimming glass, wherein the first end of the zone control switch is respectively connected to the second end of the first current limiting module and the first driving end of the dimming zone corresponding to itself, the second end is grounded, and the control end is connected to the first control output end of the processor, and is used for being turned on when a first level signal is received, and being turned off when a second level signal is received; the first level signal and the second level signal are opposite.

3. The driving circuit of the dimming glass according to claim 2, characterized in that: The second voltage output module comprises: A second current limiting module, a first end of which is connected to the power supply; A common control switch, wherein the first end is respectively connected to the second end of the second current limiting module and the second driving ends of the plurality of dimming partitions, the second end is grounded, and the control end is connected to the second control output end of the processor, and is used for being turned on when a first level signal is received and being turned off when a second level signal is received.

4. The driving circuit of the dimming glass according to claim 3, characterized in that: Also includes: The first unidirectional conducting module has a positive electrode connected to the power supply, and a negative electrode connected to the first ends of the first current limiting modules and the first ends of the second current limiting modules respectively.

5. The driving circuit of the dimming glass according to claim 2, characterized in that: Also includes: A second unidirectional conduction module is connected to the plurality of partition control switches in a one-to-one correspondence, wherein the positive electrode of the second unidirectional conduction module is connected to the second end of the corresponding partition control switch, and the negative electrode is connected to the first end of the corresponding partition control switch.

6. The driving circuit of the dimming glass according to claim 3, characterized in that: Also includes: The third unidirectional conducting module has a positive electrode connected to the second end of the common control switch and a negative electrode connected to the first end of the common control switch.

7. The driving circuit of the dimming glass according to any one of claims 1 to 6, characterized in that: Also includes: A plurality of first voltage sampling modules connected to the plurality of first voltage output modules in a one-to-one correspondence, wherein the first input end is connected to the first driving end of the corresponding dimming partition, the second input end is grounded, and the output end is connected to the input end of the processor, and is used for real-time acquisition of the voltage output by the corresponding first voltage output module; A second voltage sampling module correspondingly connected to the second voltage output module has a first input terminal connected to the output terminal of the second voltage output module, a second input terminal connected to ground, and an output terminal connected to the input terminal of the processor, and is used to collect the voltage output by the second voltage output module in real time.

8. The driving circuit of the dimming glass according to claim 7, characterized in that: The first voltage sampling module includes: A first sampling resistor, a first end of which is connected to a first driving end of a corresponding dimming partition; The second sampling resistor has a first end connected to the second end of the first sampling resistor and the input end of the processor respectively, and a second end connected to the ground.

9. A driving device for dimming glass, characterized in that: It comprises a power supply and a driving circuit for the dimming glass according to any one of claims 1 to 8, wherein the power supply is connected to the driving circuit for the dimming glass.

10. A dimming system, characterized in that: It comprises a dimming glass and a driving device for the dimming glass as claimed in claim 9, wherein the driving end of the dimming glass is connected to the driving device for the dimming glass.

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