A light column type display instrument control system

Abstract

The utility model provides a kind of light column type display instrument control system, applied to display instrument technical field, including signal input analog front-end circuit, main control module, display circuit and signal input switching circuit, main control module is connected with signal input analog front-end circuit, signal input switching circuit, display circuit respectively, main control module includes digital-analog conversion circuit, MCU controller;Signal is respectively connected signal input analog front-end circuit and main control module by signal input switching circuit, after main control module receives the output signal from signal input switching circuit and the output signal of signal input analog front-end circuit, processing output is used to control the drive signal of display circuit, and light column display is carried out by display circuit.The light column type display instrument control system, with multi-channel signal compatibility, signal conditioning perfect, control mode flexible, display intuitive and reliable and easy to expand and other advantages, can effectively overcome the defects of single function, unstable display and insufficient expansion in prior art.

Description

Technical Field

[0001] This utility model belongs to the field of display instrument technology, specifically relating to a control system for a bar graph display instrument. Background Technology

[0002] In applications such as industrial automation, energy management, environmental monitoring, and laboratory testing, there is often a need for intuitive display and real-time monitoring of analog quantities such as voltage, current, temperature, and pressure. Traditional pointer-type instruments, whose readings rely on mechanical structures and manual interpretation, suffer from slow response speed, limited indicating accuracy, and poor durability, making it difficult to meet the demands of modern rapid detection and digital control.

[0003] With the development of semiconductor display technology, bar graph displays have become increasingly widely used due to their advantages such as intuitive display, fast dynamic response, and long service life. Bar graph displays typically use an array of light-emitting diodes (LEDs), illuminating a corresponding number of light-emitting units to represent the magnitude of the measured signal, clearly and intuitively reflecting the signal strength or numerical trend. This display method is particularly advantageous in situations with high noise, low light, or where long-distance observation is required.

[0004] Most existing bar graph display instruments are implemented using dedicated driver chips or analog comparator circuits, resulting in relatively fixed circuit structures and insufficient functional expandability. For example, some bar graph instruments only support a single input path, making it difficult to accommodate the acquisition of multiple signals; some products have relatively simple signal conditioning, failing to adequately process the input signals, leading to unstable display in low-level or high-noise environments.

[0005] However, existing light column display products still have certain shortcomings in terms of modular design, system integration and display driving flexibility, which limit their application in higher precision and more complex environments. Utility Model Content

[0006] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a control system for a bar graph display instrument.

[0007] A control system for a bar graph display instrument includes a signal input analog front-end circuit, a main control module, a display circuit, and a signal input switching circuit. The main control module is connected to the signal input analog front-end circuit, the signal input switching circuit, and the display circuit. The main control module includes a digital-to-analog converter circuit and an MCU controller connected in communication. Signals are connected to the signal input analog front-end circuit and the main control module through the signal input switching circuit. The main control module receives the output signals from the signal input switching circuit and the signal input analog front-end circuit, processes them, and outputs a drive signal for controlling the display circuit. The display circuit then performs bar graph display.

[0008] Preferably, the signal input switching circuit includes at least one signal input channel. Each signal input channel includes a signal input terminal, a current-limiting resistor, a switch, a TVS diode, and a filter network. The signal input terminal is connected to the current-limiting resistor, and the other end of the current-limiting resistor is connected to the input terminal of the switch. The output terminal of the switch is connected to the signal input analog front-end circuit and the main control module, respectively. A TVS diode is connected in parallel between the current-limiting resistor and the switch. The switch is equipped with a filter network and a voltage divider network.

[0009] Preferably, the filter network includes a first resistor and a first capacitor, which are connected in parallel between pin 1 and pin 4 of the switch; the voltage divider network includes a second resistor, a third resistor, and a second capacitor, which are connected in parallel between pin 3 and pin 6 of the switch, and the third resistor and the second capacitor are connected in parallel between pin 3 of the switch and ground.

[0010] Preferably, the signal input analog front-end circuit includes an operational amplifier. The non-inverting input terminal of the operational amplifier is connected to the input signal from the signal input switching circuit, the inverting input terminal of the operational amplifier is grounded through a resistor, the output terminal of the operational amplifier is connected to a fourth resistor, the other end of the fourth resistor is connected in parallel with a filter capacitor, and the common terminal of the fourth resistor and the filter capacitor is connected to the main control module as the output terminal of the signal input analog front-end circuit.

[0011] Preferably, the power supply terminal of the operational amplifier is connected to at least one decoupling capacitor.

[0012] Preferably, it also includes a power supply module, which is connected to the signal input analog front-end circuit, the main control module, and the display circuit respectively. The power supply module includes an input protection circuit, a first-stage step-down circuit, and a second-stage voltage regulator circuit. The power supply is connected to the first-stage step-down circuit through the input protection circuit and undergoes a first voltage conversion process to form a first power supply voltage. The first power supply voltage is connected to the second-stage voltage regulator circuit and undergoes a second voltage conversion process to form a second power supply voltage. The first power supply voltage and the second power supply voltage supply power the corresponding circuit modules respectively.

[0013] The beneficial effects of this invention are as follows: the circuit structure of the bar graph display instrument control system organically combines signal acquisition, processing, and display control, maintaining stable and reliable performance in complex application environments. By introducing a signal input switching circuit, different input signal sources can be flexibly selected to meet the measurement needs under various working conditions; the addition of amplification and filtering stages in the analog front-end effectively improves the resolution of weak signals and anti-interference performance, ensuring the accuracy and stability of the bar graph display.

[0014] This invention employs a microcontroller as the core control unit, unifying the management of analog-to-digital conversion, signal processing, and display driving. This allows the light bar display to move beyond simple comparator circuits and instead achieve composite functions through a main control module. This approach not only enhances the configurability and scalability of the display but also provides the hardware foundation for future functional upgrades.

[0015] Furthermore, the present invention ensures the stability of circuit operation through multi-stage voltage regulation and protection measures in power supply design, avoiding the impact of voltage fluctuations and surge interference on display accuracy.

[0016] In summary, this bar-type display instrument control system has advantages such as multi-channel signal compatibility, excellent signal conditioning, flexible control methods, intuitive and reliable display, and easy expansion. It can effectively overcome the shortcomings of existing technologies, such as single function, unstable display, and insufficient expandability, and has significant practical value and promotion prospects. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is the circuit block diagram of this utility model; Figure 2 This is a circuit diagram of the signal input switching circuit of this utility model; Figure 3 This is the circuit diagram of the main control module of this utility model; Figure 4 This is a circuit diagram of the display circuit of this utility model; Figure 5 This is a circuit diagram of the power supply circuit of this utility model. Detailed Implementation

[0018] Example 1 like Figure 1 As shown, a control system for a bar graph display instrument includes a power supply module, a signal input analog front-end circuit, a main control module, a display circuit, and a signal input switching circuit. The main control module is connected to the signal input analog front-end circuit, the signal input switching circuit, and the display circuit. The main control module includes a digital-to-analog converter circuit and an MCU controller connected for communication. The power supply module is used to provide the required power supply voltage for each functional module.

[0019] The signal is connected to the signal input analog front-end circuit and the main control module respectively through the signal input switching circuit. The main control module receives the output signal from the signal input switching circuit and the output signal from the signal input analog front-end circuit, processes them, and outputs the drive signal for controlling the display circuit. The display circuit then displays the light bar.

[0020] The main control module receives output signals from the signal input switching circuit, which can be used for channel activation judgment, overvoltage / disconnection detection, redundancy comparison, etc.; the main control module also receives output signals from the signal input analog front-end circuit, which can be used for precise sampling, light bar display ratio conversion, trend analysis, etc.

[0021] The signal input switching circuit includes a signal input terminal, a current-limiting resistor, a switch, a TVS diode, a filter network, and a voltage divider network. Specifically, for example... Figure 2 As shown, the signal input switching circuit in this embodiment includes two channels, namely a channel one signal switching circuit and a channel two signal switching circuit with the same circuit structure. The channel one signal switching circuit will be used as an example for the following description, and the structure of the channel two signal switching circuit will not be described again.

[0022] Please refer to the following carefully. Figure 2 In the channel one signal switching circuit, the signal input terminal IN1+ is connected to the current limiting resistor R2. The other end of the current limiting resistor R2 is connected to pin five of the switcher. Pin two of the switcher is connected to the signal input analog front-end circuit and the main control module, respectively.

[0023] A TVS diode D2 is connected in parallel between the switch and the current-limiting resistor R2. The current-limiting resistor R2 provides current-limiting protection for the input signal, while the TVS diode D2 provides overvoltage protection for the input signal to prevent external surges or electrostatic discharge from damaging the subsequent circuitry.

[0024] Pin 1 of the switch is connected to pin 4, and pin 3 is connected to pin 6. A resistor R52 and a capacitor C14 are connected in parallel between pin 1 and pin 4 of the switch. A resistor R57 is connected between pin 3 and pin 6 of the switch. A resistor R58 and a capacitor C17 are connected in parallel between resistor R57 and pin 3 of the switch.

[0025] Among them, resistor R52 and capacitor C14 form a filter circuit to improve the anti-interference capability of the switcher, resistors R57 and R58 form a voltage divider network for adjusting the level of the input signal, and capacitor C17 is used to suppress high-frequency interference and improve sampling accuracy.

[0026] like Figure 2As shown, taking the signal input analog front-end circuit connected to the channel 1 signal switching circuit as an example, the signal input analog front-end circuit includes an operational amplifier U6, a resistor R53, a capacitor C15, a capacitor C3, and a capacitor C4. The non-inverting input terminal of the operational amplifier U6 is connected to the switcher of the signal input switching circuit to receive the input signal. The inverting input terminal of the operational amplifier U6 is grounded through a resistor R54. The output terminal of the operational amplifier U6 is connected to a resistor R53. The other end of the resistor R53 is connected in parallel with a capacitor C15. The common terminal of the resistor R53 and the capacitor C15 serves as the output terminal of the signal input analog front-end circuit, outputting the signal AOUT2. The output terminal of the signal input analog front-end circuit is connected to the main control module.

[0027] In addition, the power supply terminals of operational amplifier U6 are connected in parallel with capacitors C3 and C4 for power supply decoupling, filtering out power supply noise, and suppressing power supply voltage fluctuations.

[0028] like Figure 3 , Figure 4 As shown, the main control module includes an MCU controller and a digital-to-analog converter circuit. The MCU controller is connected to the digital-to-analog converter circuit and the display circuit. The MCU controller receives the output signal from the signal input switching circuit and the output signal from the signal input analog front-end circuit. The MCU controller transmits the received signal to the digital-to-analog converter circuit for processing and receives the processed feedback signal. After forming a control signal, it is transmitted to the display circuit for output display.

[0029] The power supply module connects to each functional module, providing them with suitable power supply voltages to ensure their normal operation. The power supply module includes an input protection circuit, a first-stage buck circuit, and a second-stage regulator circuit. The power supply voltage, after passing through the input protection circuit, is stepped down to 5V by the first-stage buck circuit, and then further regulated by the second-stage regulator circuit to form a 3.3V power supply voltage, which is used to provide the appropriate power supply voltage according to the needs of each circuit module.

[0030] The specific circuit of the power module in this embodiment is as follows: Figure 5 As shown, the first-stage step-down circuit includes a switching power supply U9 and its peripheral circuits, which is used to convert the 24V power supply voltage into a 5V power supply voltage; the second-stage voltage regulator circuit includes a voltage regulator U8 and its peripheral circuits, which is used to convert the 5V power supply voltage into a 3.3V power supply voltage.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A light column display instrument control system, characterized by, It includes a signal input analog front-end circuit, a main control module, a display circuit, and a signal input switching circuit. The main control module is connected to the signal input analog front-end circuit, the signal input switching circuit, and the display circuit, respectively. The main control module includes a digital-to-analog converter circuit and an MCU controller that are connected in communication. The signal is connected to the signal input analog front-end circuit and the main control module respectively through the signal input switching circuit. The main control module receives the output signal from the signal input switching circuit and the output signal from the signal input analog front-end circuit, processes them, and outputs the drive signal for controlling the display circuit. The display circuit then displays the light bar.

2. The lightbar display instrument control system of claim 1, wherein, The signal input switching circuit includes at least one signal input channel. Each signal input channel includes a signal input terminal, a current-limiting resistor, a switch, a TVS diode, and a filter network. The signal input terminal is connected to the current-limiting resistor, and the other end of the current-limiting resistor is connected to the input terminal of the switch. The output terminal of the switch is connected to the signal input analog front-end circuit and the main control module, respectively. A TVS diode is connected in parallel between the current-limiting resistor and the switch. The switch is equipped with a filter network and a voltage divider network.

3. The lightbar display instrument control system of claim 2, wherein, The filter network includes a first resistor and a first capacitor, which are connected in parallel between pin 1 and pin 4 of the switch. The voltage divider network includes a second resistor, a third resistor, and a second capacitor. The second resistor is connected between pin 3 and pin 6 of the switch, and the third resistor and the second capacitor are connected in parallel between pin 3 of the switch and ground.

4. The light pillar display instrument control system of claim 1, wherein, The signal input analog front-end circuit includes an operational amplifier. The non-inverting input terminal of the operational amplifier is connected to the input signal from the signal input switching circuit. The inverting input terminal of the operational amplifier is grounded through a resistor. The output terminal of the operational amplifier is connected to a fourth resistor. The other end of the fourth resistor is connected in parallel with a filter capacitor. The common terminal of the fourth resistor and the filter capacitor serves as the output terminal of the signal input analog front-end circuit and is connected to the main control module.

5. The lightbar display instrument control system of claim 4, wherein, The operational amplifier has at least one decoupling capacitor connected to its power supply terminal.

6. The light pillar display instrument control system of claim 1, wherein, It also includes a power module, which is connected to the signal input analog front-end circuit, the main control module, and the display circuit respectively. The power supply module includes an input protection circuit, a first-stage step-down circuit, and a second-stage voltage regulator circuit. The power supply is connected to the first-stage step-down circuit through the input protection circuit and undergoes a first voltage conversion process to form a first power supply voltage. The first power supply voltage is connected to the second-stage voltage regulator circuit and undergoes a second voltage conversion process to form a second power supply voltage. The first power supply voltage and the second power supply voltage supply power the corresponding circuit modules.

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