An anti-static interference indicating lamp circuit

Abstract

The application provides an anti-static interference indicating lamp circuit, which comprises a power supply end and a grounding end, a control signal input end, an indicating lamp unit, a switch unit, a filter unit, an anti-static protection unit, a resistance network and a control unit. The application aims at effectively suppressing static interference and level mutation of the control end, adaptively adjusting the brightness of the indicating lamp according to real-time working conditions, realizing the unity of reliable indication and energy-saving lighting, and solving the problem that the traditional circuit cannot simultaneously resist interference and save power.

Description

Technical Field

[0001] This invention relates to the field of power distribution automation technology, and in particular to an indicator light circuit that is resistant to electrostatic interference. Background Technology

[0002] As a core device for power distribution network monitoring and control, the distribution feeder automation terminal is widely used in outdoor prefabricated substations, switching stations, pole-mounted switches, and other environments with strong electromagnetic interference. Its panel LED indicators provide real-time feedback on critical operating conditions such as overcurrent, overvoltage, tripping, and communication, serving as crucial information for maintenance personnel to assess equipment status. Early indicator circuits often used incandescent or neon lamps as light sources, coupled with simple resistor current limiting and mechanical switch control, resulting in limited functionality, high power consumption, and short lifespan. With the maturity of LED technology, indicator lights have gradually shifted to LED light sources, offering significant advantages such as low power consumption, long lifespan, and fast response. In recent years, with the popularization of green energy-saving concepts and the widespread application of battery-powered equipment, energy-saving design of indicator circuits has become a research hotspot. Traditional LED driving methods often employ DC constant current or simple resistor current limiting, which, while low-cost, still result in unnecessary power consumption waste in standby or normal indication states. Therefore, the industry has begun to introduce pulse width modulation (PWM) dimming technology, adjusting the duty cycle to achieve brightness regulation, thereby reducing average power consumption. Meanwhile, in complex electromagnetic environments such as industrial control, communication base stations, and automotive electronics, indicator light circuits frequently face harsh conditions such as electrostatic discharge, power fluctuations, and high-frequency interference. Electrostatic interference is particularly prominent, with instantaneous high voltages reaching thousands of volts, easily causing level jumps at the control signal terminals, leading to indicator lights turning on, off, or flashing erroneously, severely affecting the accuracy of equipment status judgment. Traditional solutions often suppress static electricity by connecting capacitors or TVS diodes in parallel at the control terminal. However, this approach, when pursuing energy saving (such as reducing PWM frequency or drive current), often results in insufficient capacitor charging and discharging, weakening anti-static capabilities. Conversely, if anti-static is overemphasized, the circuit will operate at high brightness continuously, increasing power consumption. Therefore, there is a clear contradiction between existing technologies in anti-static interference and energy-saving lighting: anti-static requires stable drive signals and unobstructed capacitor charging and discharging paths, while energy saving requires reduced duty cycles and conduction times, making it difficult to achieve both simultaneously. In addition, traditional circuits lack the ability to adaptively adjust to environmental interference, power supply voltage fluctuations, and startup processes, failing to achieve true intelligent lighting. Therefore, how to design an indicator light circuit that can effectively suppress electrostatic interference and dynamically adjust the brightness according to actual working conditions has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0003] This invention provides an indicator light circuit that resists electrostatic interference. It aims to effectively suppress electrostatic interference and level changes at the control end, while adaptively adjusting the brightness of the indicator light according to real-time operating conditions, thereby achieving a balance between reliable indication and energy-saving lighting, and solving the problem that traditional circuits cannot simultaneously achieve both anti-interference and energy saving.

[0004] This invention provides an indicator light circuit that resists electrostatic interference, comprising: The power supply terminal and ground terminal are used to provide the operating voltage; The control signal input terminal is used to receive drive signals; The indicator light unit is used to indicate whether the indicator light is on or off according to the drive signal; A switching unit is connected in series between the indicator light unit and the ground terminal, and its control terminal is connected to the control signal input terminal to be turned on or off in response to a drive signal. A filtering unit, connected in parallel across the indicator light unit, is used to filter out AC interference signals; An anti-static protection unit, one end of which is connected to the control signal input terminal and the other end of which is connected to the ground terminal, is used to suppress electrostatic interference and level changes at the control signal terminal and enhance the circuit's anti-interference capability. The resistor network includes a first resistor, a second resistor, and a third resistor. The first resistor is connected in series between the power supply terminal and the indicator light unit to limit the operating current of the indicator light. The second resistor is connected in series between the control signal input terminal and the control terminal of the switching unit to limit the base current of the switching unit. The third resistor is connected between the control terminal of the switching unit and the power supply terminal to provide a bias voltage for the switching unit and to provide a charging and discharging path for the anti-static protection unit. It also includes a control unit, whose output is connected to the control signal input. The control unit collects at least one physical parameter in the circuit in real time and dynamically generates a pulse width modulation signal as the driving signal according to the power saving control algorithm. The duty cycle of the driving signal is adaptively adjusted according to the change of the physical parameter to achieve coordinated control of anti-static interference and power saving lighting.

[0005] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. This invention, by connecting an anti-static capacitor C2 in parallel between the control signal input terminal and ground, and in conjunction with a charging and discharging path composed of a second resistor R2 and a third resistor R3, can quickly absorb static charge, smooth out level changes, and effectively prevent the switching unit from malfunctioning due to static electricity. At the same time, the control unit monitors the voltage change rate across C2 in real time and dynamically adjusts the PWM duty cycle through a power-saving control algorithm. When static interference increases, it automatically increases the brightness to full brightness mode, further enhancing the anti-static effect and ensuring the accurate and reliable status of the indicator light. 2. This invention abandons the traditional fixed brightness or simple PWM dimming method and adopts an adaptive duty cycle adjustment algorithm based on the fusion of multiple physical parameters; the control unit collects parameters such as power supply voltage, LED current, and C2 voltage in real time, dynamically calculates the interference intensity factor, luminous efficacy demand factor, energy storage release efficiency factor, and power supply stability factor, and finally outputs the optimal duty cycle; under conditions of no interference, stable voltage, and low indication demand, the duty cycle can be reduced to the minimum brightness ratio (e.g., 5%), which greatly reduces the average power consumption and extends the life of LEDs and driver circuits, and is especially suitable for battery-powered or long-term standby equipment; 3. The algorithm of this invention can dynamically adjust the threshold and weight according to real-time operating conditions. For example, it can reduce the full brightness threshold when the power supply voltage fluctuates, making it easier for the circuit to enter the high brightness mode to avoid misjudgment. During the power-on startup phase, the brightness gradually increases to avoid discomfort caused by sudden excessive brightness or darkness. At the same time, the anti-static protection unit and the power-saving algorithm work together: C2 stores charge during the off period of the switching unit and releases it at the moment of conduction, which not only suppresses electrostatic interference but also does not increase power consumption, realizing a deep integration of hardware protection and software control. 4. This invention requires only a small number of discrete components (three resistors, two capacitors, one transistor, and one LED) and a conventional control unit (such as one GPIO pin of an MCU). It does not require a dedicated anti-static chip or a complex power management IC, and has extremely high cost-effectiveness and portability. It can be easily integrated into existing devices. 5. Through dynamic anti-interference and adaptive brightness adjustment, the indicator light can stably and clearly reflect the equipment status in various complex electromagnetic environments, avoiding erroneous indications caused by static electricity or interference, while achieving energy saving and environmental protection.

[0006] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0007] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof; in the drawings: Figure 1 This is a schematic diagram of the structure of an indicator light circuit for resisting electrostatic interference provided by the present invention; Figure 2 This is a flowchart illustrating the power-saving control algorithm. Detailed Implementation

[0008] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1:

[0009] This invention provides an indicator light circuit that resists electrostatic interference. Please refer to [link / reference]. Figure 1 ,include: The power supply terminal and ground terminal are used to provide the operating voltage; The control signal input terminal is used to receive drive signals; The indicator light unit is used to indicate whether the indicator light is on or off according to the drive signal; A switching unit is connected in series between the indicator unit and the ground terminal. Its control terminal is connected to the control signal input terminal and is used to turn on or off in response to a drive signal. A filtering unit, connected in parallel across the indicator light unit, is used to filter out AC interference signals; An anti-static protection unit, with one end connected to the control signal input terminal and the other end connected to the ground terminal, is used to suppress electrostatic interference and level changes at the control signal terminal and enhance the circuit's anti-interference capability. The resistor network includes a first resistor, a second resistor, and a third resistor. The first resistor is connected in series between the power supply terminal and the indicator light unit to limit the operating current of the indicator light. The second resistor is connected in series between the control signal input terminal and the control terminal of the switching unit to limit the base current of the switching unit. The third resistor is connected between the control terminal of the switching unit and the power supply terminal to provide a bias voltage for the switching unit and to provide a charging and discharging path for the anti-static protection unit.

[0010] Specifically, in this embodiment, the circuit uses +3.3V as the power supply terminal and GND as the ground terminal to construct a complete power supply loop; the control signal input terminal is connected to the GPIO_LED1 pin of the CPU to receive high and low level drive signals; the indicator light unit is responsible for displaying the status on / off; the switch unit, as the core of on / off control, is connected in series between the indicator light and ground, and is directly driven to turn on and off by the control signal; the filter unit is connected in parallel across the indicator light to filter out AC noise in the circuit and avoid interfering with the normal on / off of the indicator light; the anti-static protection unit is connected between the control signal input terminal and ground to absorb electrostatic charge at the control terminal and smooth out level changes, thereby improving the anti-static capability from the signal source; in the resistor network, the first resistor limits the operating current of the indicator light to prevent burnout, the second resistor limits the current of the switch unit control terminal to protect the control pin, and the third resistor provides pull-up bias for the switch unit, while also working with the second resistor to realize the charging and discharging of the anti-static protection unit, ensuring stable circuit operation.

[0011] In one embodiment, the indicator unit is a light-emitting diode LED1, whose anode is connected to the power supply terminal through a first resistor R1, and whose cathode is connected to one end of the switching unit.

[0012] Specifically, the indicator unit uses a conventional light-emitting diode LED1. The anode is connected to the +3.3V power supply terminal through the first resistor R1, and the cathode is connected to the switching unit, forming a complete current path of power supply → R1 → LED1 → switching unit → ground. The switching unit controls the LED1 to turn on and off.

[0013] In one embodiment, the switching unit is a PNP transistor Q1, whose emitter is connected to the cathode of the indicator unit, whose collector is connected to the ground terminal, and whose base is connected to the control signal input terminal as the control terminal.

[0014] Specifically, the switching unit uses a PNP transistor SS8550LT1 (Q1), with the emitter connected to the cathode of LED1, the collector connected to GND, and the base connected to the GPIO_LED1 control signal input terminal. The PNP transistor is characterized by conducting when the base is low and turning off when the base is high, thereby realizing the on / off control of the LED1 circuit.

[0015] In one embodiment, the filtering unit is a first capacitor C1, which is connected in parallel across the two ends of the indicator light unit.

[0016] Specifically, the filtering unit uses capacitor C1, which is directly connected in parallel across LED1. This can filter out AC interference waves in the power supply and signal, preventing noise from causing LED1 to flicker, light up falsely, or other abnormalities, thus ensuring stable indication status.

[0017] In one embodiment, the anti-static protection unit is a second capacitor C2, one end of which is connected to the control signal input terminal and the other end is connected to the ground terminal.

[0018] Specifically, the anti-static protection unit uses an energy storage capacitor C2, with one end connected to the GPIO_LED1 control terminal and the other end connected to GND. When electrostatic interference occurs, C2 quickly absorbs the electrostatic charge, suppresses sudden changes in the control terminal level, and prevents the electrostatic-triggered switch unit from malfunctioning.

[0019] In one embodiment, a first resistor R1 in the resistor network is connected in series between the power supply terminal and the indicator unit to limit the maximum current flowing through the indicator unit.

[0020] Specifically, the first resistor R1 is a 330Ω current-limiting resistor, connected in series between +3.3V and the anode of LED1, to limit the current flowing through LED1 within a safe range and prevent overcurrent from burning out LED1.

[0021] In one embodiment, the second resistor R2 in the resistor network is connected in series between the control signal input terminal and the control terminal of the switching unit to limit the base drive current of the switching unit and protect the control signal terminal.

[0022] Specifically, the second resistor R2 is a 1.5K resistor, connected in series between GPIO_LED1 and the base of Q1 to limit the current flowing into the base of the transistor and prevent large current from damaging the CPU's IO control pins.

[0023] In one embodiment, the third resistor R3 in the resistor network is connected between the control terminal and the power supply terminal of the switching unit to provide a pull-up bias voltage for the switching unit, ensuring that the switching unit is reliably turned off when the drive signal is high; at the same time, the third resistor R3 provides a charging path for the anti-static protection unit, and the second resistor R2 provides a discharging path for the anti-static protection unit.

[0024] Specifically, the third resistor R3 is a 10K pull-up resistor, connected between the base of Q1 and +3.3V, to provide a stable pull-up bias for the base, ensuring that Q1 is reliably turned off when GPIO_LED1 is high; when GPIO_LED1 is high, R3 limits the current of C2 charging; when GPIO_LED1 is low, R2 discharges C2, realizing a closed loop of capacitor charging and discharging, and working together to complete electrostatic protection.

[0025] In one implementation, when the drive signal is low, the drive switch unit is turned on to illuminate the indicator light, and when the drive signal is high, the drive switch unit is turned off to extinguish the indicator light; the pulse width modulation signal adjusts the duty cycle by changing the time ratio of the high and low levels.

[0026] Specifically, the circuit driving logic in this embodiment is as follows: GPIO_LED1 outputs a low level → Q1 base receives a low level → Q1 conducts → LED1 circuit is powered on and the light turns on; GPIO_LED1 outputs a high level → Q1 base receives a high level → Q1 turns off → LED1 circuit is powered off and the light turns off; if a pulse width modulation signal is input, the duty cycle can be changed by adjusting the ratio of high and low level durations to achieve indicator brightness adjustment. Example 2:

[0027] This invention provides an indicator light circuit that resists electrostatic interference. Please refer to [link / reference]. Figure 2 Based on Embodiment 1, a control unit is also included. The output of the control unit is connected to the control signal input. The control unit acquires at least one physical parameter in the circuit in real time and dynamically generates a pulse width modulation signal as a drive signal according to the power-saving control algorithm. The duty cycle of the drive signal is adaptively adjusted according to the changes in the physical parameter to achieve coordinated control of anti-static interference and power-saving lighting. The power-saving control algorithm used by the control unit is as follows: Real-time measurement of voltage at the power supply terminal The voltage across the antistatic protection unit Current flowing through the indicator light unit The duty cycle of the pulse width modulation signal is calculated using the following steps. : Step 1: Calculate the dynamic interference intensity factor : in, The conduction threshold voltage constant of the switching unit. The reference frequency constant is To estimate the interference frequency constant, It is obtained by the difference between two consecutive sampled values; The function is used to ensure that the output is in the range [0,1), and the sine term causes the interference factor to fluctuate around 0.5 times. In this embodiment, The voltage change rate of C2 reflects the severity of electrostatic discharge / interference. This is the transistor's turn-on threshold. The reference frequency, preferably 1Hz, is used for normalization; the estimated reference frequency constant is... This method is used to simulate or predict the frequency characteristics of periodic electrostatic interference in an environment. It periodically modulates the dynamic interference intensity factor, enabling the anti-static strategy to synchronize with the time-domain characteristics of the expected interference, thereby improving the suppression effect. When the actual interference frequency is close to... hour, It will change periodically with sinusoidal oscillations, thus affecting the duty cycle. Increase the brightness in advance (full illumination) during interference peaks and decrease it appropriately during troughs (power saving) to achieve predictive anti-interference. If the indicator light circuit is used in a power distribution feeder automation terminal, the common interference sources in the field are power frequency AC (50Hz) and its harmonics, then preset... =50Hz or 100Hz. If used near a switching power supply, it can be preset to the switching frequency (e.g., 65kHz) or its division. If used near wireless communication equipment, it can be preset to the envelope frequency of the communication band (e.g., 1kHz). After the circuit design is completed, the interference waveform at the control signal input can be captured with an oscilloscope under typical operating conditions, Fourier analysis can be performed, and the main peak frequency can be taken as... Write to the non-volatile memory of the control unit; if the environment cannot be predicted, a general default value (such as 50Hz) can be set, and an interface can be opened for advanced users to modify it according to actual field tests. The function constrains the result to [0,1) to avoid numerical overflow; the sine term is used to simulate disturbance fluctuations, allowing the factor to change dynamically with the disturbance.

[0028] This formula is used to quantify the static electricity and interference intensity at the control terminal; the stronger the interference, the better. The larger the value, the more accurately electrostatic interference can be detected, providing a basis for subsequent duty cycle adjustment.

[0029] Step 2: Calculate the dynamic light efficiency demand factor : in, This is the rated maximum current constant of the indicator light unit. The reference voltage constant is Startup time constant; dynamic light effect demand factor The brightness gradually increases after startup to avoid being too dim when first powered on. In this embodiment, This is the ratio of the actual LED current to the rated current, reflecting the brightness requirement. This is the ratio of the power supply voltage to the reference voltage, used to compensate for voltage fluctuations. To activate the gradient item, The startup time constant is preferably set to 0.1s. This formula combines LED current, power supply voltage, and power-on time to calculate the reasonable brightness requirement of the indicator light. The brightness gradually increases during the initial power-on phase to avoid excessive dimness and ensure visibility, while also matching the power supply and load status.

[0030] Step 3: Calculate the energy storage release efficiency factor : in, The sampling interval constant is... This is the resistance value of the second resistor. This refers to the capacitance value of the antistatic protection unit. The function is used to map the result to [0,1); In this embodiment, The change in voltage of C2 reflects the magnitude of energy release from the stored energy. The RC time constant, The sampling interval; This is the reference voltage used for normalization; The function constraint result is in [0,1). This formula is used to evaluate the energy release efficiency of C2 energy storage; the more complete the release, the better. The higher the value, the more effectively the C2 energy storage release suppresses static electricity, improving the anti-interference effect, and simultaneously feeding back to the brightness adjustment.

[0031] Step 4: Calculate the power supply voltage stability factor : Among them, power supply voltage stability factor It approaches 1 when the voltage is stable and approaches 0 when the voltage fluctuates drastically. In this embodiment, This represents the rate of change of power supply voltage, reflecting the degree of power supply fluctuation. The reference parameter is used for normalization; the exponential function causes the result to decrease as fluctuations increase. This formula is used to quantify power supply stability; the more stable the voltage, the better. The closer the value is to 1, the more drastic the fluctuation, and the closer the value is to 0. This prevents power fluctuations from causing abnormal indicator light readings and ensures stable indication. Step 5: Calculate the adaptive fusion weights : in, For dynamic interference intensity factor, For dynamic light efficiency demand factor, For energy storage release efficiency factor, This is the power supply voltage stability factor; In this embodiment, the first term in the numerator is a product, used to emphasize the synergy between interference and light efficiency; the latter two terms are additive compensations; and the whole is divided by 3 to ensure... ∈[0,1]; This formula integrates four factors—interference, brightness, energy storage, and power supply—in a weighted manner to obtain a comprehensive adjustment weight that takes into account antistatic properties, brightness, energy saving, and stability. Step 6: Calculate the dynamic threshold : in, The baseline threshold constant is preferably 0.3, and the dynamic threshold is... The threshold decreases as voltage fluctuations increase, making it easier to enter full-brightness mode during interference. In other words, the greater the voltage fluctuation, the lower the dynamic threshold, and the easier it is for the circuit to enter full-brightness mode. During interference / fluctuations, the threshold is lowered to ensure that all indicator lights are fully lit and visible, avoiding false indications.

[0032] Step 7: Determine the final duty cycle : in, This is the minimum brightness ratio constant, used to ensure the indicator light does not turn off and to achieve continuous indication function; In this embodiment, The minimum brightness ratio is preferably set to 0.05 to ensure the indicator light does not turn off; Used to limit the duty cycle to no more than 100%; This formula is used to ensure minimum brightness. It is used to achieve adaptive duty cycle constraints, taking into account indication, anti-static, and power-saving functions.

[0033] The control unit calculates the Output the pulse width modulation signal with the corresponding duty cycle to the control signal input terminal; when When =1, the switching unit is fully conductive, and all indicator lights are on; when When the switch unit operates in a high-frequency switching mode, the average current of the indicator light is proportional to the duty cycle, realizing adaptive energy-saving lighting; at the same time, the charge stored in the anti-static protection unit during the switch unit's off period is released at the moment the switch unit is turned on, suppressing the influence of electrostatic interference on the indication status.

[0034] This embodiment addresses the challenge of balancing anti-static properties and power saving in traditional indicator light circuits. While maintaining low hardware cost and strong anti-static capabilities, it achieves adaptive brightness adjustment through an algorithm. During periods of static electricity, interference, or power fluctuations, it automatically increases the duty cycle to full brightness to prevent false indications; when the state is stable, it reduces the duty cycle to save power and extend device lifespan; the brightness gradually decreases upon power-up, enhancing the user experience; and the charging and discharging of the energy storage capacitor C2 is linked to the algorithm, further strengthening anti-static capabilities.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indicator light circuit resistant to electrostatic interference, characterized in that, include: The power supply terminal and ground terminal are used to provide the operating voltage; The control signal input terminal is used to receive drive signals; The indicator light unit is used to indicate whether the indicator light is on or off according to the drive signal; A switching unit is connected in series between the indicator light unit and the ground terminal, and its control terminal is connected to the control signal input terminal to be turned on or off in response to a drive signal. A filtering unit, connected in parallel across the indicator light unit, is used to filter out AC interference signals; An anti-static protection unit, one end of which is connected to the control signal input terminal and the other end of which is connected to the ground terminal, is used to suppress electrostatic interference and level changes at the control signal terminal and enhance the circuit's anti-interference capability. The resistor network includes a first resistor, a second resistor, and a third resistor. The first resistor is connected in series between the power supply terminal and the indicator light unit to limit the operating current of the indicator light. The second resistor is connected in series between the control signal input terminal and the control terminal of the switching unit to limit the base current of the switching unit. The third resistor is connected between the control terminal of the switching unit and the power supply terminal to provide a bias voltage for the switching unit and to provide a charging and discharging path for the anti-static protection unit. It also includes a control unit, whose output is connected to the control signal input. The control unit collects at least one physical parameter in the circuit in real time and dynamically generates a pulse width modulation signal as the driving signal according to the power saving control algorithm. The duty cycle of the driving signal is adaptively adjusted according to the change of the physical parameter to achieve coordinated control of anti-static interference and power saving lighting.

2. The anti-static interference indicator circuit according to claim 1, characterized in that, The indicator unit is a light-emitting diode LED1, whose anode is connected to the power supply terminal through the first resistor R1, and whose cathode is connected to one end of the switching unit.

3. The anti-static interference indicator circuit according to claim 1, characterized in that, The switching unit is a PNP transistor Q1, whose emitter is connected to the cathode of the indicator unit, whose collector is connected to the ground terminal, and whose base is connected to the control signal input terminal as a control terminal.

4. The anti-static interference indicator circuit according to claim 1, characterized in that, The filtering unit is a first capacitor C1, which is connected in parallel across the two ends of the indicator light unit.

5. The anti-static interference indicator circuit according to claim 1, characterized in that, The anti-static protection unit is a second capacitor C2, one end of which is connected to the control signal input terminal and the other end is connected to the ground terminal.

6. The anti-static interference indicator circuit according to claim 1, characterized in that, The first resistor R1 in the resistor network is connected in series between the power supply terminal and the indicator light unit to limit the maximum current flowing through the indicator light unit.

7. The anti-static interference indicator circuit according to claim 1, characterized in that, The second resistor R2 in the resistor network is connected in series between the control signal input terminal and the control terminal of the switching unit, and is used to limit the base drive current of the switching unit and protect the control signal terminal.

8. The anti-static interference indicator circuit according to claim 1, characterized in that, The third resistor R3 in the resistor network is connected between the control terminal and the power supply terminal of the switching unit, and is used to provide a pull-up bias voltage for the switching unit to ensure that the switching unit is reliably turned off when the drive signal is high; at the same time, the third resistor R3 provides a charging path for the anti-static protection unit, and the second resistor R2 provides a discharging path for the anti-static protection unit.

9. The anti-static interference indicator circuit according to claim 1, characterized in that, When the driving signal is low, it drives the switching unit to turn on and turn on the indicator light; when it is high, it drives the switching unit to turn off and turn off the indicator light. The pulse width modulation signal adjusts the duty cycle by changing the time ratio of the high and low levels.

10. The anti-static interference indicator circuit according to claim 1, characterized in that, The power-saving control algorithm used by the control unit is as follows: Real-time measurement of the voltage at the power supply terminal The voltage across the antistatic protection unit The current flowing through the indicator unit The duty cycle of the pulse width modulation signal is calculated using the following steps. : Step 1: Calculate the dynamic interference intensity factor : in, The on-threshold voltage constant of the switching unit is... The reference frequency constant is To estimate the interference frequency constant, It is obtained by the difference between two consecutive sampled values; The function is used to ensure that the output is in the range [0,1), and the sine term causes the interference factor to fluctuate around 0.5 times. Step 2: Calculate the dynamic light efficiency demand factor : in, The rated maximum current constant of the indicator light unit is... The reference voltage constant is The start-up time constant; the dynamic light effect demand factor The brightness gradually increases after startup to avoid being too dim when first powered on. Step 3: Calculate the energy storage release efficiency factor : in, The sampling interval constant is... This is the resistance value of the second resistor. The capacitance value of the antistatic protection unit is... The function is used to map the result to [0,1); Step 4: Calculate the power supply voltage stability factor : Wherein, the power supply voltage stability factor It approaches 1 when the voltage is stable and approaches 0 when the voltage fluctuates drastically. Step 5: Calculate the adaptive fusion weights : in, For dynamic interference intensity factor, For dynamic light efficiency demand factor, For energy storage release efficiency factor, This is the power supply voltage stability factor; Step 6: Calculate the dynamic threshold : in, The dynamic threshold is a baseline threshold constant. The voltage decreases as voltage fluctuations increase, making it easier to enter full-brightness mode during interference. Step 7: Determine the final duty cycle : in, This is the minimum brightness ratio constant, used to ensure the indicator light does not turn off and to achieve continuous indication function; The control unit is based on the calculated Output the pulse width modulation signal with the corresponding duty cycle to the control signal input terminal; when When =1, the switching unit is fully turned on, and all indicator lights are on; when When the switch unit operates in a high-frequency switching mode, the average current of the indicator light is proportional to the duty cycle, realizing adaptive energy-saving lighting; at the same time, the charge stored in the anti-static protection unit during the switch unit's off period is released at the moment the switch unit is turned on, suppressing the influence of electrostatic interference on the indication status.

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