A dimming glass multi-drive driving circuit and vehicle

Abstract

This invention discloses a multi-drive circuit for dimming glass and a vehicle. Through a processing module working in conjunction with a single inverter bridge module and a single filter module, a common sinusoidal AC voltage is output and input to several solid-state relays. Simultaneously, the processing module independently outputs control signals to adjust the on / off duty cycle of each solid-state relay, enabling each dimming glass to obtain a corresponding modulated sinusoidal drive voltage, thereby achieving independent light transmittance adjustment for multiple dimming glass paths. Furthermore, this invention only requires a single inverter bridge module and a single filter module to complete multi-path driving, simplifying circuit configuration and control logic, effectively reducing hardware costs and control complexity, and better adapting to the practical application scenarios of multi-window, multi-area dimming in automobiles.

Description

Technical Field

[0001] This invention relates to the field of dimming glass technology, and specifically to a multi-drive circuit for dimming glass. Background Technology

[0002] Currently, PDLC polymer-dispersed liquid crystal dimming glass is widely used in the automotive industry as window glass. By changing the electrical state of the PDLC dimming glass, the transparency of the glass is adjusted, thereby adjusting the light transmission effect of the window and improving driving comfort and privacy.

[0003] like Figure 1 As shown, existing multi-channel drive circuits for dimming glass generally use multiple sets of MOSFETs or functionally equivalent chips to form an inverter bridge, converting the SPWM signal output by the MCU into a load-adaptive AC SPWM signal. Then, an LC filter circuit shapes the SPWM signal into a sinusoidal AC signal to drive the dimming glass. Specifically, combined with... Figure 2 The MCU outputs two sets of SPWM signals with the same amplitude and frequency, a phase difference of π, and a dead time. After being amplified by the half-bridge driver chip, the signal meets the driving voltage and current requirements of the half-bridge MOSFETs to drive the two sets of half-bridge circuits and generate an SPWM waveform power supply that meets the driving conditions of the dimming glass. The SPWM waveform is then integrated and filtered by the LC filter circuit, and finally outputs a sinusoidal AC power that can be directly applied to the dimming glass.

[0004] However, existing multi-drive circuit inverter bridge structures are complex and require dedicated half-bridge or full-bridge driver chips, resulting in high hardware costs. At the same time, the inverter bridge arms need to be set with dead time to avoid shoot-through, making control complex. Furthermore, each dimming glass requires a half-bridge driver chip and an LC filter circuit to generate two SPWM waveforms. When applied to multi-area, multi-window automotive scenarios, the number of half-bridge driver chips and LC filter circuits needs to be multiplied, leading to high hardware costs and circuit complexity, making it difficult to meet the actual usage requirements of independent dimming of multiple windows in automobiles.

[0005] Therefore, providing a multi-channel drive circuit that is simple in circuit structure and control logic, low in cost, and capable of independently adjusting multiple dimming glasses has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a dimming glass multi-drive circuit and vehicle with simple circuit structure and control logic and low hardware cost.

[0007] To achieve the above objectives, the present invention provides a multi-drive circuit for dimming glass, which works in conjunction with several dimming glasses, including a processing module, an inverter bridge module, a filtering module, and several solid-state relays. The output of the processing module is connected to the input of the inverter bridge module, the output of the inverter bridge module is connected to the input of the filter module, the output of the filter module is connected to the input of each solid-state relay, and the output of each solid-state relay is connected to the corresponding dimming glass. The processing module can output two sets of SPWM signals with the same frequency and amplitude but a 180° phase difference to the inverter bridge module; the inverter bridge module can generate an SPWM voltage waveform based on the SPWM signal and output it to the filtering module; the filtering module can convert the SPWM voltage waveform into a common sinusoidal AC voltage and output it to each solid-state relay; the processing module can also output independently controlled PWM signals to each solid-state relay to control the on / off duty cycle of each solid-state relay, so that each dimming glass inputs the corresponding modulated sinusoidal drive voltage, and independently adjusts multiple dimming glass channels.

[0008] Furthermore, the processing module is configured with two sets of SPWM signal output ports and PWM control signal output ports corresponding to the number of solid-state relays.

[0009] Furthermore, the inverter bridge module includes a driver chip unit and a half-bridge unit. The input terminal of the driver chip unit is connected to the SPWM signal output terminal of the processing module, and the output terminal is connected to the input terminal of the half-bridge unit, which can amplify the SPWM signal to a voltage and current level that can drive the half-bridge unit.

[0010] Furthermore, the half-bridge unit includes a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET. The first MOSFET and the second MOSFET form a first half-bridge arm, and the third MOSFET and the fourth MOSFET form a second half-bridge arm. The first half-bridge arm and the second half-bridge arm together output an SPWM voltage waveform with a phase difference of 180°.

[0011] Furthermore, the filtering module includes a filtering inductor and a filtering capacitor. One end of the filtering inductor is connected to the output terminal of the inverter bridge module, and the other end is connected to one end of the filtering capacitor. The other end of the filtering capacitor is grounded, which can filter out the high-frequency carrier of the SPWM voltage waveform and convert it into a common sinusoidal AC voltage.

[0012] Furthermore, the control terminals of each solid-state relay are respectively connected to the PWM control signal output terminal of the processing module, and the input terminals of each solid-state relay are collectively connected to the output terminal of the filtering module.

[0013] Furthermore, the processing module independently controls the on / off ratio of the corresponding solid-state relays by changing the duty cycle of the PWM signal output to each solid-state relay, thereby modulating the duty cycle of the driving voltage applied to the corresponding dimming glass.

[0014] Furthermore, it also includes a boost module, the input of which is connected to a power supply, and the output of which provides high voltage to the inverter bridge module and the filter module respectively.

[0015] To achieve the above objectives, the present invention provides a vehicle comprising a plurality of dimming glass and a multi-drive circuit for the dimming glass.

[0016] The multi-drive circuit and vehicle for dimming glass provided by this invention, through the cooperation of a processing module, a single inverter bridge module, and a single filter module, outputs a common sinusoidal AC voltage and inputs it to several solid-state relays. At the same time, the processing module independently outputs control signals to adjust the on / off duty cycle of each solid-state relay, so that each dimming glass obtains the corresponding modulated sinusoidal drive voltage, thereby realizing independent light transmittance adjustment of multiple dimming glass. In addition, this invention can complete multi-channel drive with only a single inverter bridge module and a single filter module, which simplifies the circuit structure and control logic, effectively reduces hardware costs and control complexity, and can better adapt to the actual application scenarios of multi-window and multi-area dimming in automobiles. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 Diagram of existing dimming glass multi-channel drive circuit; Figure 2 This is a schematic diagram of an existing multi-channel drive circuit for dimming glass. Figure 3 A framework diagram of the dimming glass multi-channel drive circuit provided by the present invention; Figure 4 This invention provides a multi-channel drive circuit diagram for dimming glass. Figure 5 The schematic diagram of the dimming glass multi-channel drive circuit provided by the present invention.

[0019] Figure label: 1. Processing module; 11. First SPWM signal output terminal; 12. Second SPWM signal output terminal; 13. PWM control signal output terminal; 2. Inverter bridge module; 21. Driver chip unit; 211. First driver chip; 212. Second driver chip; 22. Half-bridge unit; 3. Filtering module; 4. Solid-state relay; 41. First solid-state relay; 5. Dimming glass; 51. First dimming glass; 6. Boost module. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0021] See Figures 3 to 5 The diagram shows an example of a dimming glass multi-channel drive circuit provided by the present invention.

[0022] As shown in the figure, the dimming glass multi-drive circuit in this example mainly includes a processing module 1, an inverter bridge module 2, a filter module 3, and several solid-state relays 4, which work in conjunction with several dimming glass units 5.

[0023] The output of the processing module 1 is connected to the input of the inverter bridge module 2. The output of the inverter bridge module 2 is connected to the input of the filter module 3. The output of the filter module 3 is connected to the input of each solid-state relay 4. The output of each solid-state relay 4 is connected to the corresponding dimming glass 5. Processing module 1 can output two sets of SPWM signals with the same frequency and amplitude but a phase difference of 180° to inverter bridge module 2; inverter bridge module 2 can generate SPWM voltage waveforms based on the SPWM signals and output them to filter module 3; filter module 3 can convert the SPWM voltage waveforms into a common sinusoidal AC voltage and output them to each solid-state relay 4; processing module 1 can also output independently controlled PWM signals to each solid-state relay 4 to control the on / off duty cycle of each solid-state relay 4, so that each dimming glass 5 inputs the corresponding modulated sinusoidal drive voltage, realizing independent adjustment of multiple dimming glass. At the same time, multiple drives can be completed using only a single set of inverter bridge module 2 and a single set of filter module 3, which simplifies the circuit structure and control logic, effectively reduces hardware costs and control complexity, and can better adapt to the actual application scenarios of multi-window and multi-area dimming in automobiles.

[0024] Combination Figure 4 The processing module 1 is preferably composed of an MCU and is equipped with two sets of SPWM signal output ports and multiple PWM control signal output ports corresponding to the number of solid-state relays 4. The two sets of SPWM signal output ports can output two sets of SPWM signals with the same frequency and amplitude but a phase difference of 180°. Each PWM control signal output port outputs a PWM signal to the corresponding solid-state relay 4 and independently adjusts the duty cycle of each PWM signal.

[0025] In conjunction with this, the inverter bridge module 2 includes a driver chip unit 21 and a half-bridge unit 22. The input terminal of the driver chip unit 21 is connected to the SPWM signal output port of the processing module 1, and the output terminal is connected to the input terminal of the half-bridge unit 22, which can amplify the SPWM signal to the voltage and current level of the driver half-bridge unit 22.

[0026] Combination Figure 4 Specifically, the driver chip unit 21 includes a first driver chip 211 and a second driver chip 212, and the half-bridge unit 22 includes a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3 and a fourth MOSFET Q4.

[0027] The input terminal of the first driver chip 211 is connected to the first SPWM signal output terminal 11 of the processing module 1, and the output terminal is connected to the gates of the first MOSFET Q1 and the second MOSFET Q2 respectively; the input terminal of the second driver chip 212 is connected to the second SPWM signal output terminal 12 of the processing module 1, and the output terminal is connected to the gates of the third MOSFET Q3 and the fourth MOSFET Q4 respectively.

[0028] Furthermore, the drain of the first MOSFET Q1 is connected to the high-voltage power supply HV, and the source of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2 to form the first half-bridge output terminal; the source of the second MOSFET Q2 is grounded.

[0029] The drain of the third MOSFET Q3 is connected to the high-voltage power supply HV, and the source of the third MOSFET Q3 is connected to the drain of the fourth MOSFET Q4 to form the output terminal of the second half-bridge; the source of the fourth MOSFET Q4 is grounded.

[0030] Combination Figure 4 In conjunction with this, the circuit also includes a boost module 6. The input terminal of the boost module 6 is connected to a power supply (such as a vehicle battery), and the output terminal provides high voltage to the inverter bridge module 2 and the filter module 3 respectively. Specifically, the output terminal of the boost module 6 is connected to the drain of the first MOSFET Q1 and the third MOSFET Q3 respectively, so that the drain of the first MOSFET Q1 and the third MOSFET Q3 can be connected to the high voltage power supply HV.

[0031] Based on the above circuit structure, the first MOSFET Q1 and the second MOSFET Q2 form the first half-bridge arm, and the third MOSFET Q3 and the fourth MOSFET Q4 form the second half-bridge arm. The processing unit 1 outputs SPWM1 / 2 to the first driver chip 211 through the first SPWM signal output terminal 11. The first driver chip 211 amplifies the SPWM1 / 2 to a voltage and current level that can drive the first half-bridge arm, and forms SPWM voltage waveforms that can drive the first half-bridge arm at the gates (points A and B) of the first MOSFET Q1 and the second MOSFET Q2, respectively.

[0032] Correspondingly, the second SPWM signal output terminal 12 outputs SPWM3 / 4 to the second driver chip 212. The second driver chip 212 amplifies SPWM3 / 4 to a voltage and current level that can drive the second half-bridge arm, and forms SPWM voltage waveforms that can drive the second half-bridge arm at the gates (points C and D) of the third MOSFET Q3 and the fourth MOSFET Q4, respectively.

[0033] The specific configuration of the driver chip is a conventional technique in this field and will not be elaborated here.

[0034] In this example, the SPWM voltage waveforms of the gate of the first MOSFET Q1 (point A) and the gate of the third MOSFET Q3 (point C) are the same, and the SPWM voltage waveforms of the gate of the second MOSFET Q2 (point B) and the gate of the fourth MOSFET Q4 (point D) are the same.

[0035] Furthermore, the SPWM voltage waveform drives each MOSFET to operate in the variable resistance region and the cutoff region. The high voltage HV output by the boost module 6 is input to the input terminals of the first half-bridge arm and the second half-bridge arm through the drain connection point (point E) of the first MOSFET Q1 and the third MOSFET Q3. This causes the output terminals of the first half-bridge arm (i.e., the connection point between the source of the first MOSFET Q1 and the drain of the second MOSFET Q2, denoted as point F) and the output terminals of the second half-bridge arm (i.e., the connection point between the source of the third MOSFET Q3 and the drain of the fourth MOSFET Q4, denoted as point G) to generate SPWM voltage waveforms with an amplitude of Up and a phase difference of 180°, respectively. This enables the first half-bridge arm and the second half-bridge arm to jointly output two SPWM voltage waveforms with a phase difference of 180°.

[0036] In conjunction with this, the filter module 3 can convert the SPWM voltage waveform output by the inverter bridge module 2 into a common sinusoidal AC voltage and output it to each solid-state relay 4.

[0037] Combination Figure 4 The filtering module 3 includes a first filtering inductor L1, a second filtering inductor L2, and a filtering capacitor C1. One end of the first filtering inductor L1 is connected to the output terminal F of the first half-bridge arm, and the other end of the first filtering inductor L1 is connected to the first filtering node (point H). One end of the second filtering inductor L2 is connected to the output terminal G of the second half-bridge arm, and the other end of the second filtering inductor L2 is connected to the second filtering node (point I). The filtering capacitor C1 is connected between the first filtering node (point H) and the second filtering node (point I).

[0038] Based on the above circuit structure, the SPWM voltage waveform output from the first half-bridge arm output terminal (point F) is filtered by the first filter inductor L1, and the SPWM voltage waveform output from the second half-bridge arm output terminal (point G) is filtered by the second filter inductor L2. Combined with the absorption effect of the filter capacitor C1 on the high-frequency carrier component, the two SPWM voltage waveforms output from the first half-bridge arm output terminal and the second half-bridge arm output terminal are converted into sinusoidal AC voltages with amplitude and frequency that meet the driving requirements and phase difference of 180° between the first filter node (point H) and the second filter node (point I), providing a stable sinusoidal AC driving signal for the subsequent driving of the dimming glass 5.

[0039] The second filter inductor L2 is symmetrically arranged with the first filter inductor L1, and together with the filter capacitor C1, they form a differential LC filter structure. This structure ensures the symmetry of the output waveforms of the first half-bridge arm and the second half-bridge arm, thereby improving the filtering effect and ensuring the stability and balance of the output sinusoidal AC voltage.

[0040] Furthermore, the sinusoidal AC voltage signal output by the filter module 3 can be used as the input to each solid-state relay 4 corresponding to the common sinusoidal AC voltage.

[0041] Compared with the existing technology that requires a separate inverter bridge and filter circuit for each dimming glass, this circuit uses a single inverter bridge module 2 and a single filter module 3 to output a common sinusoidal AC voltage, and coordinates with multiple solid-state relays for independent modulation. It eliminates the need to add an inverter bridge and filter unit for each load, which simplifies the hardware structure and reduces the circuit construction cost and control complexity.

[0042] In conjunction with this, the control terminal of each solid-state relay 4 is independently connected to the PWM control signal output terminal 13 of the processing module 1, the input terminal of each solid-state relay 4 is connected to the output terminal of the filter module 3, and the input terminal of each solid-state relay 4 is connected to the corresponding dimming glass 5.

[0043] Therefore, each solid-state relay 4 can be input with a common sinusoidal AC voltage. The processing module 1 outputs PWM signals to the corresponding solid-state relay 4 through the output terminals 13 of each PWM control signal, and independently adjusts the duty cycle of each PWM signal. By changing the duty cycle of the PWM signal output to each solid-state relay 4, the on and off ratio of the corresponding solid-state relay 4 can be independently controlled to modulate the duty cycle of the sinusoidal drive voltage applied to the corresponding dimming glass 5.

[0044] Combination Figure 4 For example, the control terminal of the first solid-state relay 41 is connected to the output terminal of the first PWM control signal corresponding to the processing module 1, the input terminal is connected to the output terminal of the filter module 3, and the output terminal is connected to the first dimming glass 51. The processing module 1 inputs a PWM control signal to the first solid-state relay 41 through the first PWM control signal output terminal and adjusts the duty cycle of the PWM control signal to adjust the on and off ratio of the first solid-state relay 41, thereby adjusting the duty cycle of the sinusoidal drive voltage input from the first solid-state relay 41 to the first dimming glass 51, and realizing independent adjustment of the light transmittance of the first dimming glass 51.

[0045] Similarly, the processing module 1 outputs PWM control signals with different duty cycles to each solid-state relay 41 through the corresponding PWM control signal output terminal, so that each solid-state relay 41 is turned on and off at different ratios, thereby adjusting the duty cycle of the sinusoidal drive voltage of each dimming glass 5 and realizing independent adjustment of the light transmittance of each dimming glass 51.

[0046] This constitutes the multi-drive circuit for dimming glass provided by the present invention. Through the cooperation of processing module 1, single-group inverter bridge module 2, and single-group filter module 3, a common sinusoidal AC voltage is output and input to several solid-state relays 4. At the same time, processing module 1 independently outputs control signals to adjust the on / off duty cycle of each solid-state relay 4, so that each dimming glass 5 obtains the corresponding modulated sinusoidal drive voltage, thereby realizing independent light transmittance adjustment of multiple dimming glass 5s. In addition, this circuit can complete multi-channel drive with only a single-group inverter bridge module 2 and a single-group filter module 4, which simplifies the circuit structure and control logic, effectively reduces hardware costs and control complexity, and can better adapt to the actual application scenarios of multi-window and multi-area dimming in automobiles.

[0047] The present invention also provides a vehicle comprising a plurality of dimming glass and a dimming glass multi-drive circuit composed of the above-described scheme, so as to realize independent control of the light transmittance of the plurality of dimming glass in the vehicle, thereby improving driving comfort and privacy.

[0048] Here, the specific configuration of the vehicle and the dimming glass is a conventional technique in this field and will not be elaborated upon here.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-drive circuit for dimming glass, used in conjunction with several dimming glasses, characterized in that, It includes a processing module, an inverter bridge module, a filter module, and several solid-state relays. The output of the processing module is connected to the input of the inverter bridge module, the output of the inverter bridge module is connected to the input of the filter module, the output of the filter module is connected to the input of each solid-state relay, and the output of each solid-state relay is connected to the corresponding dimming glass. The processing module can output two sets of SPWM signals with the same frequency and amplitude but a 180° phase difference to the inverter bridge module; the inverter bridge module can generate an SPWM voltage waveform based on the SPWM signal and output it to the filtering module; the filtering module can convert the SPWM voltage waveform into a common sinusoidal AC voltage and output it to each solid-state relay; the processing module can also output independently controlled PWM signals to each solid-state relay to control the on / off duty cycle of each solid-state relay, so that each dimming glass inputs the corresponding modulated sinusoidal drive voltage, and independently adjusts multiple dimming glass channels.

2. The dimming glass multi-drive circuit according to claim 1, characterized in that, The processing module is configured with two sets of SPWM signal output ports and PWM control signal output ports corresponding to the number of solid-state relays.

3. The dimming glass multi-drive circuit according to claim 2, characterized in that, The inverter bridge module includes a driver chip unit and a half-bridge unit. The input terminal of the driver chip unit is connected to the SPWM signal output terminal of the processing module, and the output terminal is connected to the input terminal of the half-bridge unit. It can amplify the SPWM signal to a voltage and current level that can drive the half-bridge unit.

4. The dimming glass multi-drive circuit according to claim 3, characterized in that, The half-bridge unit includes a first MOSFET, a second MOSFET, a third MOSFET, and a fourth MOSFET. The first MOSFET and the second MOSFET form a first half-bridge arm, and the third MOSFET and the fourth MOSFET form a second half-bridge arm. The first half-bridge arm and the second half-bridge arm together output an SPWM voltage waveform with a phase difference of 180°.

5. The dimming glass multi-drive circuit according to claim 1, characterized in that, The filtering module includes a filtering inductor and a filtering capacitor. One end of the filtering inductor is connected to the output terminal of the inverter bridge module, and the other end is connected to one end of the filtering capacitor. The other end of the filtering capacitor is grounded, which can filter out the high-frequency carrier of the SPWM voltage waveform and convert it into a common sinusoidal AC voltage.

6. The dimming glass multi-drive circuit according to claim 2, characterized in that, The control terminals of each solid-state relay are connected to the corresponding PWM control signal output terminal of the processing module, and the input terminals of each solid-state relay are connected to the output terminal of the filtering module.

7. The dimming glass multi-drive circuit according to claim 6, characterized in that, The processing module independently controls the on / off ratio of the corresponding solid-state relays by changing the duty cycle of the PWM signal output to each solid-state relay, thereby modulating the duty cycle of the driving voltage applied to the corresponding dimming glass.

8. The dimming glass multi-drive circuit according to claim 1, characterized in that, It also includes a boost module, whose input terminal is connected to a power supply, and whose output terminal provides high voltage to the inverter bridge module and the filter module respectively.

9. A vehicle comprising a plurality of dimming glass, characterized in that, It also includes the dimming glass multi-drive circuit according to any one of claims 1-8.

Images