A nixie tube driving system based on time division multiplexing switch array

Abstract

The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on time division multiplexing switch array, it is related to LED digital tube driving technical field.The application discloses a kind of digital tube driving systems based on

Description

Technical Field

[0001] This invention discloses a digital tube driving system based on a time-division multiplexed switch array, which relates to the field of LED digital tube driving technology. Background Technology

[0002] Digital tube displays, as a commonly used display device, are widely used in instruments, home appliances, and automotive displays. Their core function is to clearly display numbers and symbols. With the development of display technology, color digital tubes have gradually become a market trend. They achieve diverse color displays through the combination of red, green, and blue LEDs, meeting personalized needs such as distinguishing the status of high-end instruments, creating ambient lighting effects in automotive devices, and providing colorful interaction with smart home appliances.

[0003] Currently, existing color digital tube driving solutions suffer from problems such as insufficient driving channels, complex circuits, inflexible color adjustment, and lack of fault detection functions. Summary of the Invention

[0004] In view of this, this application provides a digital tube driving system based on a time-division multiplexed switch array to solve the problems of insufficient driving channels, complex circuits, inflexible color adjustment, and lack of fault detection function in the prior art.

[0005] A digital tube driving system based on a time-division multiplexed switch array includes: The power module is used to connect to an external power source and output multiple stable operating voltages; The digital tube display module, connected to the power supply module, contains multiple digital tube units, used to receive drive signals and display corresponding numbers or symbols based on the drive signals; The AW21036 driver module, connected to the power module, is used to receive the first control command and output multiple drive signals according to the first control command. The time-division multiplexing switch array is connected to the AW21036 driver module and the digital tube display module. It is used to receive the second control command and, based on the second control command, to conduct multiple drive signals to each digital tube unit in a time-division manner to realize the expansion of the drive channel. The main control module, connected to the AW21036 driver module and time division multiplexing switch array, is used to receive external signals and generate and output the first control command and the second control command based on the external signals.

[0006] Optionally, the first power supply terminal VDD2 of the main control module is coupled to the power supply terminal VDD1 of the power module chip, and the first fault input terminal S3 and the second fault input terminal S4 are respectively coupled to the first fault output terminal S1 and the second fault output terminal S2 of the AW21036 driver module; The main control module's clock terminal SCL1 and data terminal SDA1 are coupled to the AW21036 driver module's clock terminal SCL2 and data terminal SDA2 respectively via the I2C communication protocol. The enable control terminal EN1 is coupled to the AW21036 driver module's enable control terminal EN2, and its ground terminal GND3 is grounded. The AW21036 driver module interface power supply terminal I / O is coupled to the power supply terminal VIO of the power module IO. The 36 driver output terminals LED1 to LED36 of the AW21036 driver module are connected one-to-one to the 36 input terminals CH1 to CH36 of the time-division multiplexing switch array, and its ground terminal GND4 is grounded. The 72 output terminals OUT1 to OUT72 of the time-division multiplexing switch array are connected one-to-one to the 72 cathode terminals of the digital tube display module. Its control terminal CTRL2 is coupled to the control terminal CTRL1 of the main control module, and its ground terminal GND5 is grounded. The 72 anode terminals of the digital tube display module are connected one-to-one to one end of 72 current-limiting resistors R1 to R72, and the other ends of the 72 current-limiting resistors R1 to R72 are connected to the LED power supply terminal VLED of the power module. The first grounding terminal GND1 and the second grounding terminal GND2 of the power module are grounded, and the power input terminal VIN is connected to an external power source to power the entire system.

[0007] Optionally, the digital tube display module includes a first digital tube unit, a second digital tube unit, and a third digital tube unit; The first digital tube unit includes 24 cathode input terminals a1 to g3 and 24 anode input terminals a4 to g6; The 24 cathode input terminals a1 to g3 are connected to the 24 output terminals OUT1 to OUT24 of the time-division multiplexing switch array, and the 24 anode input terminals a4 to g6 are connected to one end of the 24 current-limiting resistors R1 to R24. The second digital tube unit includes 24 cathode input terminals a7 to g9 and 24 anode input terminals a10 to g12; The 24 cathode input terminals a7 to g9 are connected to the 24 output terminals OUT25 to OUT48 of the time-division multiplexing switch array, and the 24 anode input terminals a10 to g12 are connected to one end of the 24 current-limiting resistors R25 to R48. The third digital tube unit includes 24 cathode input terminals a13 to g15 and 24 anode input terminals a16 to g18; The 24 cathode input terminals a13 to g15 are connected to the 24 output terminals OUT49 to OUT72 of the time-division multiplexing switch array, and the 24 anode input terminals a16 to g18 are connected to one end of the 24 current-limiting resistors R49 to R72.

[0008] Optionally, the main control module also includes a serial port transmitter (TX) and a serial port receiver (RX), which are coupled to an external debugging interface to receive debugging commands to adjust the first control command and the second control command.

[0009] Optionally, the main control module may also include: The key input terminal (KEY) is coupled to an external key and is used to control the display color of the digital tube display module. The alarm control terminal BZ is coupled to the alarm circuit and is used to control the alarm circuit to issue an alarm prompt when a fault signal is received.

[0010] Optionally, the power module has built-in filtering and voltage regulation circuits to filter out high-frequency noise and ripple in the power supply and stabilize the output voltage.

[0011] Optionally, the AW21036 driver module also includes a current setting terminal ISET, which is coupled to one end of a resistor REXT, and the other end of the resistor REXT is grounded. It is used to set the global output current of the AW21036 driver module by the resistance value of the resistor REXT.

[0012] Optionally, the clock terminal SCL2 of the AW21036 driver module is also grounded through a filter capacitor C1, and its data terminal SDA2 is also grounded through another filter capacitor C2, in order to suppress I2C communication interference.

[0013] Optionally, the power supply I / O of the AW21036 driver module is also grounded through a filter capacitor C3 to suppress power supply noise.

[0014] Optionally, the AW21036 driver module also includes an address configuration terminal AD, which is grounded.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention include at least the following: This application presents a digital tube driving system based on a time-division multiplexing switch array. By setting up a time-division multiplexing switch array, the 36 driving signals of the AW21036 driving module are time-division multiplexed to the 72 light-emitting elements of the digital tube display module. This achieves efficient driving of multiple LEDs with limited driving channels, simplifies the circuit structure, reduces hardware costs, and avoids the problems of poor synchronization and uneven display caused by multi-chip combined driving. Simultaneously, the use of the AW21036 driving chip in conjunction with the I2C communication control of the main control module enables 256 levels of color mixing and brightness adjustment, allowing for flexible and varied display colors to meet diverse scenario requirements. Its built-in fault detection terminal is linked with the alarm circuit of the main control module, which can promptly issue alarm prompts and execute protection actions when LEDs are open-circuited, short-circuited, or the chip overheats, significantly improving the system's stability and reliability. Furthermore, by setting up a debugging interface, button input terminal, and filtering circuit, the system's debugging convenience, human-computer interaction, and anti-interference capability are further enhanced. This application fundamentally solves the problems of insufficient driving channels, complex circuits, inflexible color adjustment, and lack of fault detection function in existing technologies. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 The system circuit block diagram provided by the present invention; Figure 2 The circuit block diagram of the digital tube display module provided by the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In this application, relational terms such as "first" and "second" are used merely 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 limitation, 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 the element.

[0020] Example 1 As can be seen from the background technology above, current color digital tube driving solutions typically employ a combination of multiple monochrome LED driver chips or a general-purpose RGB driver chip paired with complex peripheral circuits. This multi-chip combination driving method not only increases the layout space and hardware cost of the circuit board but also easily leads to poor driving synchronization, resulting in uneven color display, flickering, and other abnormalities. Furthermore, the number of channels and current control precision of general-purpose RGB driver chips often cannot accurately match the three-color LED driving requirements of an 8.88-inch digital tube, necessitating additional voltage divider and current limiting circuits, resulting in high circuit complexity and difficult debugging. In addition, existing solutions lack flexibility in color adjustment, often only allowing switching between a few fixed colors, making it difficult to achieve fine-grained color mixing and brightness adjustment. They also lack functions such as LED open / short circuit detection and over-temperature protection, making long-term stability and reliability difficult to guarantee.

[0021] Therefore, this embodiment provides a digital tube driving system based on a time-division multiplexed switch array, such as... Figure 1 and Figure 2 As shown, the system includes a power supply module, a digital tube display module, an AW21036 driver module, a time-division multiplexing switch array, and a main control module.

[0022] The power module is used to connect to an external power source and output multiple stable operating voltages. In this embodiment, the power module has a power input terminal VIN, a first ground terminal GND1, an LED power supply terminal VLED, a chip power supply terminal VDD1, an IO power supply terminal VIO, and a second ground terminal GND2. The power input terminal VIN and the first ground terminal GND1 are used to connect to an external power source (such as a 5V DC power supply) to power the entire system; the chip power supply terminal VDD1 outputs a 3.3V operating voltage to provide core power to the main control module and the AW21036 driver module; the IO power supply terminal VIO outputs a 1.8V operating voltage to power the IO interface of the AW21036 driver module; and the LED power supply terminal VLED outputs a 3.3V operating voltage to power the LEDs of the digital tube display module. The power module also internally includes filtering and voltage regulation circuits (such as 0.1μF ceramic capacitors, 10μF electrolytic capacitors, and AMS1117 series linear regulators) to filter out power supply noise and stabilize the output voltage, ensuring stable system operation.

[0023] The digital tube display module is connected to the LED power supply terminal VLED of the power module to receive drive signals and display the corresponding numbers or symbols. For example... Figure 2 As shown, the digital tube display module includes three digital tube units: a first digital tube unit, a second digital tube unit, and a third digital tube unit, which together form an "8.88" display pattern. Each digital tube unit contains 24 cathode ports and 24 anode ports, corresponding to the cathodes and anodes of red, green, and blue LEDs, respectively. Specifically, the first digital tube unit has 24 cathode input terminals a1 to g3 and 24 anode input terminals a4 to g6; the second digital tube unit has 24 cathode input terminals a7 to g9 and 24 anode input terminals a10 to g12; and the third digital tube unit has 24 cathode input terminals a13 to g15 and 24 anode input terminals a16 to g18. Each anode port is connected to the LED power supply terminal VLED of the power module through a current-limiting resistor. In this embodiment, a 100Ω surface-mount resistor is used to limit the LED operating current, protect the LED, and ensure brightness consistency.

[0024] It should be noted that the first digital tube unit has 24 cathode input terminals a1 to g3 and dp1 to dp3, specifically a1, a2, a3, b1, b2, b3, c1, c2, c3, d1, d2, d3, e1, e2, e3, f1, f2, f3, dp1, dp2, dp3, g1, g2, g3; and 24 anode input terminals a4 to g6, specifically a4, a5, a6, b4, b5, b6, c4, c5, c6, d4, d5, d6, e4, e5, e6, f4, f5, f6, dp4, dp5, dp6, g4, g5, g6.

[0025] Furthermore, the second and third digital tube units can be obtained in the same way, only the serial numbers are changed, which will not be described in detail here.

[0026] The AW21036 driver module uses the AW21036 chip, which is connected to the power supply module. It is used to receive the first control command sent by the main control module and output 36 drive signals according to the first control command. The pin configuration of the AW21036 chip is as follows: its power supply terminal VDD3 is connected to the chip power supply terminal VDD1 of the power module to receive a 3.3V operating voltage; its I / O interface power supply terminal I / O is connected to the I / O power supply terminal VIO of the power module to receive a 1.8V I / O interface voltage; its ground terminal GND4 is grounded; its current setting terminal ISET is connected to the second ground terminal GND2 of the power module through a resistor REXT (4.0kΩ in this embodiment) to set the chip's global output current (set to 20mA in this embodiment); its first fault output terminal S1 and second fault output terminal S2 are used to output LED fault signals and over-temperature protection signals, respectively; its clock terminal SCL2 and data terminal SDA2 are used for I2C communication with the main control module to receive the first control command; its enable terminal EN2 is used to receive the enable control signal from the main control module; its 36 drive output terminals LED1 to LED36 are used to output 36 drive signals. In addition, the address configuration terminal AD of the AW21036 chip is grounded in this embodiment to select the default I2C address. To suppress I2C communication interference, the clock terminal SCL2 and the data terminal SDA2 are grounded through filter capacitors C1 (100pF) and C2 (100pF) respectively; to suppress power supply noise, the I / O power supply terminal of the IO interface is grounded through filter capacitor C3 (0.1μF).

[0027] Furthermore, the global output current of the AW21036 driver module is determined by the external resistor REXT connected to the current setting terminal ISET, and their relationship satisfies: in, For global output current, This is a constant related to the chip's internal reference voltage. hour, It is matched with the rated operating current of the tri-color LED.

[0028] The time-division multiplexing switch array is connected to the AW21036 driver module and the digital tube display module. It receives the second control command sent by the main control module and, based on this command, sequentially conducts 36 drive signals to the 72 cathode ports of the digital tube display module, thereby expanding the drive channels. In this embodiment, the time-division multiplexing switch array is composed of multiple cascaded analog switch chips (such as CD4051), and has 36 input terminals CH1~CH36, 72 output terminals OUT1~OUT72, a control terminal CTRL2, and a ground terminal GND5. Its input terminals CH1 to CH36 are connected one-to-one with the drive output terminals LED1 to LED36 of the AW21036 driver module; its output terminals OUT1 to OUT72 are connected one-to-one with the 72 cathode ports of the digital tube display module (i.e., a1 to g3 of the first digital tube unit corresponds to OUT1 to OUT24, a7 to g9 of the second digital tube unit corresponds to OUT25 to OUT48, and a13 to g15 of the third digital tube unit corresponds to OUT49 to OUT72); its control terminal CTRL2 is connected to the second control terminal CTRL1 of the main control module for receiving switching control signals; its ground terminal GND5 is grounded.

[0029] The main control module uses an STM32F103 microcontroller, connected to an AW21036 driver module and a time-division multiplexing switch array, to receive external signals and generate and output the first and second control commands based on these signals. The main control module's pin configuration is as follows: its first power supply terminal VDD2 is connected to the chip power supply terminal VDD1 of the power module to receive a 3.3V operating voltage; its first ground terminal GND3 is grounded; its serial port transmit terminal TX and serial port receive terminal RX are connected to an external debugging interface (such as a USB-to-serial module CH340) to receive debugging commands to adjust the first and second control commands; its key input terminal KEY is connected to external keys (such as three color selection keys) to control the display color of the digital tube display module; its alarm control terminal BZ is connected to the alarm circuit (composed of a transistor S8050 and a buzzer) to control the alarm circuit to issue an alarm prompt when a fault signal is received; its first fault input terminal S3 and second fault input terminal BZ are connected to the alarm circuit. The fault input terminal S4 is connected to the first fault output terminal S1 and the second fault output terminal S2 of the AW21036 driver module to receive fault feedback signals. Its first clock terminal SCL1 and first data terminal SDA1 are connected to the clock terminal SCL2 and data terminal SDA2 of the AW21036 driver module via the I2C bus to send the first control command. Its enable control terminal EN1 is connected to the enable terminal EN2 of the AW21036 driver module to output the enable signal. Its second control terminal CTRL1 is connected to the control terminal CTRL2 of the time-division multiplexing switch array to output the second control command, which controls the switch array to cyclically switch at a frequency of ≥100Hz, and conducts 36 drive signals to 72 cathode ports in a time-division multiplexing manner.

[0030] It should be noted that the first grounding terminal GND3 of the main control module is grounded. In this embodiment, this grounding terminal is specifically connected to the second grounding terminal GND2 of the power supply module to achieve a unified system ground potential. Similarly, the grounding terminal GND4 of the AW21036 driver module is grounded; and the grounding terminal GND5 of the time-division multiplexing switch array is grounded. In this embodiment, both grounding terminals are also connected to the second grounding terminal GND2 of the power supply module.

[0031] Furthermore, the first grounding terminal GND1 of the power module is grounded and used to connect to the external power supply ground; its second grounding terminal GND2 is grounded and serves as the system ground. In this embodiment, the first grounding terminal GND1 is connected to the ground wire of the external power supply, and the second grounding terminal GND2 serves as a common reference point, connected to the GND3 of the main control module, the GND4 of the drive module, and the GND5 of the switch array, forming a unified system ground.

[0032] Furthermore, the main control module sends the first control command to the AW21036 driver module via the I2C bus to set the current value for each channel. and PWM duty cycle Among them, the current value exist to It is adjustable in 256 levels to control the luminous intensity of the LED and achieve color mixing; PWM duty cycle It is adjustable in 256 levels between 0% and 100% to control the average brightness of the LED and achieve brightness adjustment.

[0033] For any three LEDs (red, green, and blue) within a display segment, their luminous intensities satisfy the following: in, , , These are the luminous efficiency constants for red, green, and blue LEDs, respectively. , , These are the set current values ​​for the three channels; , , These represent the PWM duty cycles for the three channels. By adjusting the ratios of these three values, arbitrary color mixing can be achieved. For example, when... and When it is white, it is displayed; when When only one circuit is active, it displays red.

[0034] Working principle After the system is powered on, the power module starts up, providing stable operating voltages to the main control module, AW21036 driver module, and digital tube display module through its chip power supply terminal VDD1, IO power supply terminal VIO, and LED power supply terminal VLED. Each module then enters its initial state.

[0035] After the main control module completes initialization, it first sends a first control command to the AW21036 driver module via the I2C bus to configure its internal registers, including: setting the operating mode of each channel, determining the global output current (20mA in this embodiment) through the external resistor REXT connected to the ISET terminal, and initializing the PWM duty cycle and channel current values. Simultaneously, the main control module sends a second control command to the time-division multiplexing switch array via the second control terminal CTRL1 to set its switching frequency (120Hz in this embodiment) and switching sequence.

[0036] After the system enters normal operating mode, the main control module receives external input signals. These external signals include: Debugging commands are sent through an external debugging interface connected to the serial port transmitter (TX) and receiver (RX). Display color switching commands are input via external buttons connected through the KEY input terminal.

[0037] The main control module analyzes the received external signals to determine the display content and color requirements, and generates the corresponding display code. Taking the display of the white number "8" as an example, the main control module determines the display segments (a, b, c, d, e, f, g) that need to be illuminated, and sets the current ratio (1:1:1) and brightness level of the red, green, and blue colors (e.g., 50% brightness corresponds to a PWM duty cycle of 128 / 256). The main control module sends the above configuration data to the AW21036 driver module via the I2C bus as a first control command, updating the current registers and PWM registers of each channel.

[0038] The AW21036 driver module outputs corresponding drive signals on its 36 drive output terminals LED1 to LED36 according to the received first control command. At the same time, the main control module continuously sends a second control command to the time-division multiplexing switch array through the second control terminal CTRL1, controlling it to switch cyclically at a frequency of 120Hz.

[0039] The timing sequence of the time-division multiplexing switch array during a complete switching cycle is as follows: First time slice (t1, approximately 4.17ms): Input terminals CH1 to CH36 are turned on to output terminals OUT1 to OUT36 respectively, and the drive signal is transmitted to the first group of 36 LEDs (i.e., the R and G color LEDs in a1 to g3 of the first digital tube unit, and the corresponding parts of the second and third digital tube units), so that they are lit up; The second time slice (t2, approximately 4.17ms): Input terminals CH1 to CH36 are turned on to output terminals OUT37 to OUT72 respectively, and the drive signal is transmitted to the second group of 36 LEDs (i.e., the B-color LEDs in each digital tube unit and the remaining ones), causing them to light up.

[0040] Because the switching frequency (120Hz) is higher than the persistence of vision in the human eye (approximately 50-60Hz), the observer perceives all 72 LEDs as being lit simultaneously and stably, and cannot detect the flickering phenomenon caused by the time-sharing switching. By adjusting the current value of each channel within each time slice, arbitrary color mixing can be achieved.

[0041] Furthermore, under the control of the second control command of the main control module, the time-division multiplexing switch array operates at a frequency... A cyclic switching process is performed, time-division multiplexing the 36 drive signals to 72 cathode ports. Let the switching cycle be... Divide the period into two time slices and ,and .

[0042] First Time Film Internally, input terminals CH1 to CH36 are respectively turned on to output terminals OUT1 to OUT36, driving the first group of 36 LEDs (i.e., the LEDs with subscripts 1 and 2 in each digital tube unit); in the second time slice Inside, the input terminals CH1 to CH36 are respectively turned on to the output terminals OUT37 to OUT72, which drive the second group of 36 LEDs (i.e., the LEDs with the subscript 3 in each digital tube unit and some other combinations).

[0043] To ensure that flickering is imperceptible to the human eye, the switching frequency must meet the following requirements: At this time, the persistence of vision effect of the human eye makes the time-division lighting of the two sets of LEDs perceived as simultaneous lighting, thereby realizing the stable driving of 72 LEDs by 36 physical channels.

[0044] The effective conduction time of each LED within a complete switching cycle is: (or Its average brightness is: in This represents the instantaneous brightness of the LED under constant driving conditions. By adjusting the switching frequency and duty cycle, the display effect and power consumption can be further optimized.

[0045] During system operation, the AW21036 driver module monitors the output status of each channel and the chip temperature in real time. When an LED open circuit, short circuit, or chip overheating occurs: If the first fault output terminal S1 outputs a high level (LED fault), the main control module receives the signal through the first fault input terminal S3. If the second fault output terminal S2 outputs a high level (over-temperature fault), the main control module receives the signal through the second fault input terminal S4.

[0046] Upon receiving a fault signal, the main control module immediately triggers the alarm circuit via the alarm control terminal BZ, controlling the transistor to conduct and causing the buzzer to sound an alarm. Simultaneously, the main control module executes protection actions based on the fault type: for LED faults, it cuts off the PWM output of the corresponding channel to prevent the fault from escalating; for over-temperature faults, it sends a command via the I2C bus to the AW21036 driver module to reduce the global output current or pause the drive until the temperature returns to normal.

[0047] When an external debugging interface is connected, the host computer can send debugging commands via serial port. Upon receiving these commands, the main control module adjusts the color parameters, brightness parameters, or switching frequency in the first control command in real time and writes the updated configuration to the AW21036 driver module, enabling online debugging of the display effect. When the user presses an external button, the main control module switches to a preset color mode (such as red, green, blue, yellow, purple, etc.) based on the button input and synchronously updates the current ratio of each channel via the I2C bus.

[0048] Through the above technical solution, this embodiment utilizes a time-division multiplexing switch array to achieve efficient driving of 72 LEDs through 36 driving channels, simplifying the circuit structure and reducing costs; it adopts the AW21036 chip with 256 levels of current and PWM regulation, realizing flexible color mixing and brightness control; it has built-in fault detection and alarm functions, improving system reliability; and the design of the debugging interface and buttons enhances the convenience of human-machine interaction.

[0049] Example 2 This embodiment has the same basic structure as Embodiment 1, the difference being that the selection or connection method of some components can be adjusted according to actual needs to reflect the flexibility of the present invention.

[0050] In the power supply module, the chip power supply terminal VDD1 can output 5V according to the working voltage requirements of the main control module and the driver module (for example, using an AMS1117-5.0 voltage regulator). The IO power supply terminal VIO is still 1.8V. The LED power supply terminal VLED can be selected as 3.3V or 5V according to the LED's rated voltage. In this embodiment, 5V power supply is selected, and the corresponding current limiting resistor is adjusted to 150Ω to maintain a 20mA working current.

[0051] The address configuration pin (AD) of the AW21036 driver module can be grounded, connected to VDD, or left floating depending on the I2C address requirements. In this embodiment, to accommodate multi-chip cascading scenarios, the AD pin is left floating, and the second I2C address is selected. The external resistor (REXT) of the current setting pin (ISET) can be adjusted according to the required global current. For example, a 2.7kΩ resistor can be used to set a 30mA output current to match a higher brightness LED.

[0052] The time-division multiplexing switch array can use other models of analog switch chips, such as CD4067 (16-to-1) cascaded to achieve 36-to-72 functionality, with the number of control signal lines adjusted accordingly. The main control module provides address selection signals through more GPIO pins. The switching frequency can be adjusted between 100Hz and 200Hz according to the display effect requirements.

[0053] The current-limiting resistor of the digital tube display module can be selected with different resistance values ​​according to the actual current-voltage characteristics of the LEDs to ensure uniform brightness of each color LED. The debugging interface can also be remotely debugged using wireless methods such as Bluetooth modules.

[0054] The other parts and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here. Through the above modifications, those skilled in the art can flexibly adjust the system parameters and device selection according to specific application scenarios, all of which fall within the protection scope of this invention.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0056] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0057] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A nixie tube driving system based on a time division multiplexing switch array, characterized by, include: The power module is used to connect to an external power source and output multiple stable operating voltages; The digital tube display module, connected to the power module, includes multiple digital tube units for receiving drive signals and displaying corresponding numbers or symbols based on the drive signals; The AW21036 driver module is connected to the power module and is used to receive a first control command and output multiple drive signals according to the first control command. A time-division multiplexing switch array is connected to the AW21036 driver module and the digital tube display module. It is used to receive a second control command and, based on the second control command, to conduct the multiple driving signals to each digital tube unit in a time-division manner to realize the expansion of the driving channel. The main control module, connected to the AW21036 driver module and the time-division multiplexing switch array, is used to receive external signals and generate and output the first control command and the second control command according to the external signals.

2. The time-multiplexed switch array based character tube driving system according to claim 1, wherein, The first power supply terminal VDD2 of the main control module is coupled to the power supply terminal VDD1 of the power module chip, and the first fault input terminal S3 and the second fault input terminal S4 are respectively coupled to the first fault output terminal S1 and the second fault output terminal S2 of the AW21036 driver module; The main control module's clock terminal SCL1 and data terminal SDA1 are coupled to the AW21036 driver module's clock terminal SCL2 and data terminal SDA2 respectively via the I2C communication protocol. The enable control terminal EN1 is coupled to the AW21036 driver module's enable control terminal EN2, and its ground terminal GND3 is grounded. The AW21036 driver module interface power supply terminal I / O is coupled to the power supply terminal VIO of the power module IO. The 36 driver output terminals LED1 to LED36 of the AW21036 driver module are connected one-to-one to the 36 input terminals CH1 to CH36 of the time-division multiplexing switch array, and its ground terminal GND4 is grounded. The 72 output terminals OUT1 to OUT72 of the time-division multiplexing switch array are connected one-to-one to the 72 cathode terminals of the digital tube display module. Its control terminal CTRL2 is coupled to the control terminal CTRL1 of the main control module, and its ground terminal GND5 is grounded. The 72 anode terminals of the digital tube display module are connected one-to-one to one end of 72 current-limiting resistors R1 to R72, and the other ends of the 72 current-limiting resistors R1 to R72 are connected to the LED power supply terminal VLED of the power module. The first grounding terminal GND1 and the second grounding terminal GND2 of the power module are grounded, and the power input terminal VIN is connected to an external power source to power the entire system.

3. The time-multiplexed switch array based character tube driving system according to claim 2, wherein The digital tube display module includes a first digital tube unit, a second digital tube unit, and a third digital tube unit; The first digital tube unit includes 24 cathode input terminals a1 to g3 and 24 anode input terminals a4 to g6; The 24 cathode input terminals a1 to g3 are connected to the 24 output terminals OUT1 to OUT24 of the time-division multiplexing switch array, and the 24 anode input terminals a4 to g6 are connected to one end of the 24 current-limiting resistors R1 to R24. The second digital tube unit includes 24 cathode input terminals a7 to g9 and 24 anode input terminals a10 to g12; The 24 cathode input terminals a7 to g9 are connected to the 24 output terminals OUT25 to OUT48 of the time-division multiplexing switch array, and the 24 anode input terminals a10 to g12 are connected to one end of the 24 current-limiting resistors R25 to R48. The third digital tube unit includes 24 cathode input terminals a13 to g15 and 24 anode input terminals a16 to g18; The 24 cathode input terminals a13 to g15 are connected to the 24 output terminals OUT49 to OUT72 of the time-division multiplexing switch array, and the 24 anode input terminals a16 to g18 are connected to one end of the 24 current-limiting resistors R49 to R72.

4. The time-multiplexed switch array based character tube driving system according to claim 2, wherein The main control module also includes a serial port transmitter (TX) and a serial port receiver (RX), which are coupled to an external debugging interface to receive debugging commands to adjust the first control command and the second control command.

5. The time-multiplexed switch array based character tube driving system according to claim 4, wherein, The main control module also includes: The key input terminal KEY is coupled to an external key and is used to control the display color of the digital tube display module; The alarm control terminal BZ is coupled to the alarm circuit and is used to control the alarm circuit to issue an alarm prompt when a fault signal is received.

6. The time-multiplexed switch array based character tube driving system according to claim 2, wherein The power module has built-in filtering and voltage regulation circuits to filter out high-frequency noise and ripple in the power supply and stabilize the output voltage.

7. The time-multiplexed switch array based character tube driving system according to claim 2, wherein The AW21036 driver module also includes a current setting terminal ISET, which is coupled to one end of a resistor REXT, and the other end of the resistor REXT is grounded. ISET is used to set the global output current of the AW21036 driver module by the resistance value of the resistor REXT.

8. The digital tube driving system based on a time-division multiplexed switch array according to claim 2, characterized in that, The clock terminal SCL2 of the AW21036 driver module is also grounded through a filter capacitor C1, and its data terminal SDA2 is also grounded through another filter capacitor C2, in order to suppress I2C communication interference.

9. The time-multiplexed switch array based character tube driving system according to claim 2, wherein, The power supply terminal (I / O) of the AW21036 driver module is also grounded through a filter capacitor C3 to suppress power supply noise.

10. The time-multiplexed switch array based character tube driving system according to claim 2, wherein, The AW21036 driver module also includes an address configuration terminal AD, which is grounded.

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