Alternating current charging pile self-diagnosis and state light indication system
By implementing status diagnosis of AC charging piles through hardware logic gate circuits, the problem of poor anti-interference capability of the system is solved, the reliability and response speed of the system are improved, and the fault status is displayed in a timely manner.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-04-03
AI Technical Summary
The existing AC charging pile status diagnosis system has poor anti-interference ability and is easily affected by software malfunctions or electromagnetic interference, which can cause the system to crash and fail to perform status diagnosis normally.
The system employs a hardware logic gate circuit consisting of a voltage monitoring module, a voltage reference module, a comparison module, and a priority encoding module. State judgment is achieved through voltage comparison and logic gate circuits, which simplifies the system structure and improves anti-interference capability and response speed.
This improves the system's anti-interference capability and response speed, ensures that the most urgent fault status is displayed first, avoids user misjudgment, and enhances the reliability and security of the indication.
Smart Images
Figure CN121784408A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrical equipment testing and indication technology, and proposes an AC charging pile self-diagnosis and status light indication system. Background Technology
[0002] With the rapid development of new energy vehicles, AC charging piles, as an important infrastructure, have been widely used. The stable operation of AC charging piles is crucial for ensuring the charging needs of new energy vehicles. It involves the coordinated work of multiple electronic systems and power modules, requiring real-time monitoring and accurate diagnosis of key power status. In related technologies, to achieve status diagnosis of AC charging piles, microcontrollers are typically used. The microcontroller collects and analyzes various parameters of the charging pile through programming to determine its operating status. Simultaneously, simple indicator lights are used to indicate the general operating status, but these lights often provide only limited information and cannot intuitively reflect specific fault points. However, existing methods relying on microcontrollers for status diagnosis have several problems. Firstly, microcontroller systems have poor anti-interference capabilities and are easily affected by software malfunctions or electromagnetic interference, leading to system crashes and the inability to perform normal status diagnosis.
[0003] The aforementioned technologies suffer from poor anti-interference capabilities. Summary of the Invention
[0004] In order to improve the anti-interference capability of the device, this application provides an AC charging pile self-diagnosis and status light indication system.
[0005] The self-diagnosis and status light indication system for AC charging piles provided in this application adopts the following technical solution: A self-diagnostic and status light indication system for AC charging piles includes: A voltage monitoring module is used to connect to the main control board of the AC charging pile, and generate a first monitoring voltage based on a first test voltage received from the main control board of the AC charging pile, generate a second monitoring voltage based on a second test voltage, and generate a third monitoring voltage based on a third test voltage. A voltage reference module is used to connect to the main control board of the AC charging pile and generate a first reference voltage, a second reference voltage and a third reference voltage according to the AC power received from the main control board of the AC charging pile. A comparison module is connected to the voltage monitoring module and the voltage reference module. The comparison module is used to receive the first monitoring voltage, the second monitoring voltage, the third monitoring voltage, the first reference voltage, the second reference voltage, and the third reference voltage, and compare the first monitoring voltage with the first reference voltage to generate a first signal, compare the second monitoring voltage with the second reference voltage to generate a second signal, and compare the third monitoring voltage with the third reference voltage to generate a third signal. A priority encoding module, connected to the comparison module, is used to receive the first signal, the second signal, and the third signal, and generate a red light driving signal, a blue light driving signal, a yellow light driving signal, and a green light driving signal based on the first signal, the second signal, and the third signal. Specifically, when the first signal is low, the red light driving signal is high, and the blue light driving signal, the yellow light driving signal, and the green light driving signal are all low; when the first signal is high and the second signal is low, the blue light driving signal is high, and the yellow light driving signal and the green light driving signal are both low; when the first signal and the second signal are both high, and the third signal is low, the yellow light driving signal is high, and the green light driving signal is low; and when the first signal, the second signal, and the third signal are all high, the green light driving signal is high.
[0006] By adopting the above technical solution, the entire system is implemented through voltage comparison and logic gate circuits (implied by the function of the priority encoding module), resulting in a simple structure that eliminates the need for complex microprocessors (MCUs) for intensive software polling and logical judgments. This not only reduces hardware costs but also improves the system's anti-interference capability and response speed. When the first signal is low (representing the highest priority fault), the system forces a red light signal to be output regardless of the status of other signals. This ensures that, under any circumstances, the most urgent and important status (usually a fault) will be displayed first, avoiding user misjudgment due to multiple concurrent statuses and greatly improving the reliability and safety of the indication.
[0007] Optionally, the priority encoding module includes an inverting unit connected to the comparison module. The inverting unit is used to receive the first signal to generate the red light driving signal, receive the second signal to generate the second inverted signal, and receive the third signal to generate the third inverted signal.
[0008] By adopting the above technical solution, the first signal, which is low, is directly converted to a high-level red light drive signal via an inverter, minimizing the transmission path and speeding up the response of the highest-priority fault judgment signal. The inverter unit not only processes the red light signal but also prepares the necessary inverted input signals (the second and third inverted signals) for the logic circuits that generate blue, yellow, and other signals (subsequent NAND gates). This circuit multiplexing design lays the foundation for constructing complete priority logic and reduces the number of components.
[0009] Optionally, the priority encoding module further includes NAND gate units, each comprising a first NAND sub-unit, a second NAND sub-unit, and a third NAND sub-unit. All three sub-units are connected to the comparison module and the inverting unit. The first NAND sub-unit receives the first signal and the second inverted signal to generate a blue light signal. The second NAND sub-unit receives the first signal, the second signal, and the third inverted signal to generate a yellow light signal. The third NAND sub-unit receives the first signal, the second signal, and the third signal to generate a green light signal. The first, second, and third NAND sub-units are configured to output a low-level signal only when all received signals are high-level.
[0010] By employing the above technical solution, and combining different signals (original signal and inverted signal) into a NAND gate, the logic of "outputting the corresponding signal only when the higher priority condition is not met and the current priority condition is met" is precisely realized. Using pure hardware logic gates to implement state judgment results in a faster response speed (nanosecond level) compared to logic relying on microcontroller software execution, and is unaffected by software malfunctions or interruptions, significantly improving system stability and reliability.
[0011] Optionally, the inverting unit is further configured to receive the blue light signal to generate the blue light driving signal, receive the yellow light signal to generate the yellow light driving signal, and receive the green light signal to generate the green light driving signal.
[0012] By employing the above technical solution, the NAND gate outputs a low level when all inputs are high, but this low-level signal is usually insufficient to directly drive an LED. By using an inverter again, this effective low-level signal is converted into a high-level drive signal, which can then drive the subsequent LED driver circuit. By having the inverter unit perform the dual tasks of inverting the input signal and the output signal, the circuit design is further optimized, reducing the types and number of components, which helps to reduce costs and PCB board area.
[0013] Optionally, when the first monitoring voltage is lower than the first reference voltage, the first signal is at a low level; when the first monitoring voltage is higher than the first reference voltage, the first signal is at a high level. When the second monitoring voltage is lower than the second reference voltage, the second signal is at a low level; when the second monitoring voltage is higher than the second reference voltage, the second signal is at a high level. When the third monitoring voltage is lower than the third reference voltage, the third signal is at a low level; when the third monitoring voltage is higher than the third reference voltage, the third signal is at a high level.
[0014] By adopting the above technical solution, it links the abstract "first, second, and third signals" with the specific physical quantity "voltage level," making the technical solution clearer and more complete. When a critical power supply voltage (monitoring voltage) falls below the minimum value (reference voltage) required for normal operation, it is judged as a fault (output low level).
[0015] Optionally, the voltage monitoring module includes a first voltage monitoring unit, a second voltage monitoring unit, and a third voltage monitoring unit. The first voltage monitoring unit, the second voltage monitoring unit, and the third voltage monitoring unit are all connected to the main control board of the AC charging pile. The first voltage monitoring unit is used to receive the first voltage to be measured to generate the first monitoring voltage. The second voltage monitoring unit is used to receive the second voltage to be measured to generate the second monitoring voltage. The third voltage monitoring unit is used to receive the third voltage to be measured to generate the third monitoring voltage.
[0016] By adopting the above technical solution and using independent voltage monitoring units, different and optimized monitoring circuits can be set for three different monitoring points. Similarly, optimal and independent reference voltage values can be set for each of them. This design greatly enhances the system's adaptability and accuracy, allowing it to flexibly cope with the complex and diverse electrical environment inside the charging pile. Each voltage monitoring unit is independent; a failure in one unit will not directly affect the circuit functions of other units (only the logic input is affected), facilitating troubleshooting and modular replacement, and improving system maintainability.
[0017] Optionally, the AC charging pile analog circuit self-diagnosis and status light indication system further includes an AC input and DC conversion module, which is used to connect to the main control board of the AC charging pile and to convert the AC power supply into a DC reference voltage.
[0018] By adopting the above technical solution, the AC input and DC conversion module provides a stable and accurate DC reference voltage for subsequent circuits, ensuring the accuracy of the entire diagnostic system's judgment.
[0019] Optionally, the voltage reference module includes a first voltage reference unit, a second voltage reference unit, and a third voltage reference unit. The first voltage reference unit, the second voltage reference unit, and the third voltage reference unit are all connected to the AC input to DC conversion module. The first voltage reference unit is used to generate the first reference voltage based on the reference voltage, the second voltage reference unit is used to generate the second reference voltage based on the reference voltage, and the third voltage reference unit is used to generate the third reference voltage based on the reference voltage.
[0020] By adopting the above technical solution, each voltage reference unit is designed as a simple voltage divider circuit or uses an adjustable reference voltage chip, thereby setting a tailored and optimal voltage threshold for each comparison, which greatly improves the diagnostic accuracy and reliability of the entire self-diagnostic system.
[0021] Optionally, a light-emitting diode (LED) driving module is provided, comprising a red light driving unit, a blue light driving unit, a yellow light driving unit, and a green light driving unit. All of these units are connected to the priority encoding module. The red light driving unit receives the red light driving signal to generate a red light display signal; the blue light driving unit receives the blue light driving signal to generate a blue light display signal; the yellow light driving unit receives the yellow light driving signal to generate both the red and green light display signals; and the green light driving unit receives the green light driving signal to generate the green light display signal.
[0022] By adopting the above technical solution, the driver module acts as a power amplifier, converting the logic signal into a current or voltage with sufficient driving capability to ensure that the LED can be reliably lit. The yellow light driver unit receives the yellow light driver signal to generate the red light display signal and the green light display signal, meaning that yellow is achieved by simultaneously lighting a red LED and a green LED. This design eliminates the need for a separate yellow LED; it can achieve the display of four colors—red, green, blue, and yellow—using only red, green, and blue LEDs. Furthermore, more mixed colors can be achieved through PWM (Pulse Width Modulation) of the driver signal, thus expanding the types of status indicators without increasing the cost of LED hardware.
[0023] Optionally, a light-emitting diode module is connected to the light-emitting diode driving module. The light-emitting diode module is used to receive the red light display signal to emit red light, receive the blue light display signal to emit blue light, receive the red light display signal and the green light display signal to emit yellow light, and receive the green light display signal to emit green light.
[0024] By adopting the above technical solution and using red, green, and blue primary color LEDs (i.e., RGB LEDs) as the physical basis, a huge space is reserved for future functional expansion. By controlling the drive signals of the red, green, and blue channels with PWM (Pulse Width Modulation), thousands of colors can be mixed.
[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The entire system is implemented using voltage comparison and logic gates (implied by the function of the priority encoding module), resulting in a simple structure that eliminates the need for complex microprocessors (MCUs) for intensive software polling and logical judgments. This not only reduces hardware costs but also improves the system's anti-interference capability and response speed. When the first signal is low (representing the highest priority fault), the system forces a red light signal to be output regardless of the status of other signals. This ensures that, under any circumstances, the most urgent and important status (usually a fault) will be displayed first, avoiding user misjudgment due to multiple concurrent statuses and greatly improving the reliability and safety of the indication. 2. The first signal, initially low, is directly converted to a high-level red light drive signal via an inverter, minimizing the transmission path and speeding up the response of the highest-priority fault judgment signal. The inverter not only processes the red light signal but also prepares the necessary inverted input signals (second and third inverted signals) for the logic circuits generating blue, yellow, and other signals (subsequent NAND gates). This circuit multiplexing design lays the foundation for constructing complete priority logic and reduces the number of components. 3. By combining different signals (original and inverted signals) and inputting them into the NAND gates, the logic of "outputting the corresponding signal only when the high-priority condition is not met and the current priority condition is met" is precisely implemented. Using pure hardware logic gates to implement state judgment results in a faster response speed (nanosecond level) compared to logic relying on microcontroller software execution, and is unaffected by software malfunctions or interruptions, significantly improving system stability and reliability. 4. The driver module acts as a power amplifier, converting the logic signal into a current or voltage with sufficient driving capability to ensure that the LED can be reliably lit. The yellow light driver unit receives the yellow light drive signal to generate the red and green light display signals, meaning that yellow is achieved by simultaneously lighting a red and a green LED. This design eliminates the need for a separate yellow LED, using only red, green, and blue LEDs to display four colors: red, green, blue, and yellow. Furthermore, more mixed colors can be achieved through PWM (Pulse Width Modulation) of the drive signal, thus expanding the types of status indicators without increasing LED hardware costs. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a module of an AC charging pile self-diagnosis and status light indication system according to an embodiment of this application; Figure 2 yes Figure 1 A schematic diagram of the intermediate conversion unit; Figure 3 yes Figure 1 Schematic diagram of the intermediate voltage regulator unit; Figure 4 yes Figure 1 A schematic diagram of the indicator light unit; Figure 5 yes Figure 1 A schematic diagram of the first voltage monitoring unit; Figure 6 yes Figure 1 A schematic diagram of the second voltage monitoring unit; Figure 7 yes Figure 1 A schematic diagram of the third voltage monitoring unit; Figure 8 yes Figure 1 A schematic diagram of the first voltage reference unit; Figure 9 yes Figure 1 A schematic diagram of the second voltage reference unit; Figure 10 yes Figure 1 A schematic diagram of the third voltage reference unit; Figure 11 yes Figure 1 A schematic diagram of the comparison module; Figure 12 yes Figure 1 A schematic diagram of the inverting cell; Figure 13 yes Figure 1 A schematic diagram of a NAND gate unit; Figure 14 yes Figure 1 A schematic diagram of the red light drive unit; Figure 15 yes Figure 1 A schematic diagram of the blue LED driver unit; Figure 16 yes Figure 1 Schematic diagram of the yellow light drive unit; Figure 17 yes Figure 1 A schematic diagram of the green light drive unit; Figure 18 yes Figure 1 A schematic diagram of the LED module.
[0027] Explanation of reference numerals in the attached diagram: 10. AC input to DC conversion module; 11. Conversion unit; 11a. AC to DC conversion device; 12. Voltage regulation unit; 13. Indicator light unit; 20. Voltage monitoring module; 21. First voltage monitoring unit; 22. Second voltage monitoring unit; 23. Third voltage monitoring unit; 30. Voltage reference module; 31. First voltage reference unit; 32. Second voltage reference unit; 33. Third voltage reference unit; 40. Comparison module; 41. Four-channel voltage comparator; 50. Priority encoding module; 51. Inverting unit; 52. NAND gate unit; 52a. First NAND gate sub-unit; 52b. Second NAND gate sub-unit; 52c. Third NAND gate sub-unit; 60. LED driver module; 61. Red light driver unit; 62. Blue light driver unit; 63. Yellow light driver unit; 64. Green light driver unit; 70. LED module. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1-18 This application will be described in further detail.
[0029] This application discloses an AC charging pile self-diagnosis and status light indication system.
[0030] Figure 1 This is a schematic diagram of a module of an AC charging pile self-diagnosis and status light indication system according to an embodiment of this application. (Refer to...) Figure 1 The AC charging pile self-diagnosis and status light indication system includes an AC input and DC conversion module 10, a voltage monitoring module 20, a voltage reference module 30, a comparison module 40, a priority encoding module 50, an LED driving module 60, and an LED module 70. The AC input and DC conversion module 10 connects to the main control board of the AC charging pile to obtain 220V AC power, which is then rectified, filtered, and regulated through two stages to convert it into a stable reference voltage. The voltage reference module 30 connects to the AC input and DC conversion module 10, and receives the reference voltage, generating a first reference voltage, a second reference voltage, and a third reference voltage based on the reference voltage.
[0031] The voltage monitoring module 20 is used to connect to the main control board of the AC charging pile to receive a first voltage to be measured, a second voltage to be measured, and a third voltage to be measured, and converts the first voltage to be measured into a first monitoring voltage, the second voltage to be measured into a second monitoring voltage, and the third voltage to be measured into a third monitoring voltage.
[0032] The comparison module 40 is connected to the voltage reference module 30 and the voltage monitoring module 20. The comparison module 40 receives the first reference voltage, the second reference voltage, the third reference voltage, the first monitoring voltage, the second monitoring voltage, and the third monitoring voltage. The comparison module 40 is also used to compare the first reference voltage with the first monitoring voltage to generate a first signal, compare the second reference voltage with the second monitoring voltage to generate a second signal, and compare the third reference voltage with the third monitoring voltage to generate a third signal. The priority encoding module 50 is connected to the comparison module 40 and the LED driving module 60, and the LED driving module 60 is connected to the LED module 70. The priority encoding module 50 receives the first signal, the second signal, and the third signal, and controls the LED driving module 60 according to the first signal, the second signal, and the third signal to drive the LED module 70 to display different colors of light.
[0033] The state light indication logic is shown in Table 1.
[0034] Table 1 Reference Figure 1 As shown in Table 1, the AC input to DC conversion module 10 includes a conversion unit 11, a voltage regulator unit 12, and an indicator light unit 13. The conversion unit 11 is connected to the main control board of the AC charging pile to obtain 220V AC power, convert the 220V AC voltage to DC power, and filter the DC power. The voltage regulator unit 12 is connected to the conversion unit 11, and receives the DC power, steps it down to the reference voltage, and regulates the reference voltage. The indicator light unit 13 is connected to the voltage regulator unit 12, and receives the reference voltage and displays green according to the reference voltage. When the reference voltage is present, the indicator light unit 13 displays green.
[0035] The voltage reference module 30 includes a first voltage reference unit 31, a second voltage reference unit 32, and a third voltage reference unit 33. The voltage regulator unit 12 is connected to the first voltage reference unit 31, the second voltage reference unit 32, and the third voltage reference unit 33. The first voltage reference unit 31 receives the reference voltage and generates the first reference voltage based on the reference voltage. The second voltage reference unit 32 receives the reference voltage and generates the second reference voltage based on the reference voltage. The third voltage reference unit 33 receives the reference voltage and generates the third reference voltage based on the reference voltage.
[0036] The voltage monitoring module 20 includes a first voltage monitoring unit 21, a second voltage monitoring unit 22, and a third voltage monitoring unit 23. The first voltage monitoring unit 21, the second voltage monitoring unit 22, and the third voltage monitoring unit 23 are all connected to the main control board of the AC charging pile. The first voltage monitoring unit 21 receives the first voltage to be measured and converts it into a first monitoring voltage. The second voltage monitoring unit 22 receives the second voltage to be measured and converts it into a second monitoring voltage. The third voltage monitoring unit 23 receives the third voltage to be measured and converts it into a third monitoring voltage.
[0037] The comparison module 40 is connected to the first voltage monitoring unit 21, the second voltage monitoring unit 22, the third voltage monitoring unit 23, the first voltage reference unit 31, the second voltage reference unit 32, and the third voltage reference unit 33. The comparison module 40 receives the first monitoring voltage, the second monitoring voltage, the third monitoring voltage, the first reference voltage, the second reference voltage, and the third reference voltage; compares the first monitoring voltage with the first reference voltage to generate the first signal; compares the second monitoring voltage with the second reference voltage to generate the second signal; and compares the third monitoring voltage with the third reference voltage to generate the third signal.
[0038] The priority encoding module 50 includes an inverting unit 51 and a NAND gate unit 52. The NAND gate unit 52 includes a first NAND gate sub-unit 52a, a second NAND gate sub-unit 52b, and a third NAND gate unit 52c. The LED driving module 60 includes a red light driving unit 61, a blue light driving unit 62, a yellow light driving unit 63, and a green light driving unit 64.
[0039] The comparison module 40 is connected to the inverting unit 51, which receives the first signal and converts it into a red light driving signal. The red light driving unit 61 is connected to the inverting unit 51 and the light-emitting diode module 70, which receives the red light driving signal and drives the light-emitting diode module 70 to emit red light according to the red light driving signal.
[0040] When the first monitoring voltage is lower than the first reference voltage, the first signal is at a low level, the red light driving signal is at a high level, and the red light driving unit 61 drives the light-emitting diode module 70 to emit red light, corresponding to cases 5, 6, 7, and 8 in Table 1.
[0041] When the first monitoring voltage is not lower than the first reference voltage, the first signal is at a high level, the red light driving signal is at a low level, and the red light driving unit 61 does not drive the light-emitting diode module 70, corresponding to cases 1, 2, 3, and 4 in Table 1.
[0042] The inverting unit 51 is also used to receive the second signal and convert the second signal into a second inverted signal. The first NAND gate sub-unit 52a is connected to the inverting unit 51 and the comparison module 40. The first NAND gate sub-unit 52a is used to receive the first signal and the second inverted signal, and output a blue light signal according to the first signal and the second inverted signal. The blue light signal is low only when both the first signal and the second inverted signal are high; otherwise, the blue light signal is high. The inverting unit 51 is also used to receive the blue light signal and convert the blue light signal into a blue light driving signal. The blue light driving unit 62 is connected to the inverting unit 51. The blue light driving unit 62 is used to receive the blue light driving signal and drive the light-emitting diode module 70 to emit blue light according to the blue light driving signal.
[0043] When the second monitoring voltage is lower than the second reference voltage and the first monitoring voltage is higher than the first reference voltage, the second signal is low, the first signal is high, the second inverted signal is high, the blue light signal is low, the blue light drive signal is high, the blue light drive unit 62 drives the light-emitting diode module 70 to emit blue light according to the high-level blue light drive signal, and the red light drive unit 61 does not drive the light-emitting diode module 70, corresponding to the third and fourth cases in Table 1.
[0044] When the second monitoring voltage is higher than the second reference voltage and the first monitoring voltage is higher than the first reference voltage, both the second signal and the first signal are at a high level, the second inverted signal is at a low level, the blue light signal is at a high level, the blue light driving signal is at a low level, the blue light driving unit 62 does not drive the light-emitting diode module 70, and the red light driving unit 61 also does not drive the light-emitting diode module 70, corresponding to the first and second cases in Table 1.
[0045] Since the blue light signal is low only when both the first signal and the second inverted signal are high, when the first signal is low, the blue light signal is high, the blue light driving signal is low, the blue light driving unit 62 does not drive the light-emitting diode module 70, and the red light driving unit 61 drives the light-emitting diode module 70 to emit red light, corresponding to cases 5, 6, 7, and 8 in Table 1.
[0046] The inverting unit 51 is also used to receive the third signal and convert the third signal into a third inverted signal. The second NAND gate subunit 52b is connected to the inverting unit 51 and the comparison module 40. The second NAND gate subunit 52b is used to receive the third inverted signal, the first signal, and the second signal, and output a yellow light signal according to the third inverted signal, the first signal, and the second signal. The yellow light signal is low only when the first signal, the second signal, and the third inverted signal are all high; otherwise, the yellow light signal is high. The inverting unit 51 is also used to receive the yellow light signal and convert the yellow light signal into a yellow light driving signal. The yellow light driving unit 63 is connected to the inverting unit 51. The yellow light driving unit 63 is used to receive the yellow light driving signal and drive the light-emitting diode module 70 to emit yellow light according to the yellow light driving signal.
[0047] When the third monitoring voltage is lower than the third reference voltage, the second monitoring voltage is higher than the second reference voltage, and the first monitoring voltage is higher than the first reference voltage, the third signal is low, the third inverted signal is high, the second signal is high, the first signal is high, the yellow light signal is low, and the yellow light drive signal is high. The yellow light drive unit 63 drives the LED module 70 to emit yellow light according to the high-level yellow light drive signal. The red light drive unit 61 and the blue light drive unit 62 do not drive the LED module 70, corresponding to the second case in Table 1.
[0048] When the third monitoring voltage is higher than the third reference voltage, the second monitoring voltage is higher than the second reference voltage, and the first monitoring voltage is higher than the first reference voltage, the third signal is high, the third inverted signal is low, the second signal is high, the first signal is high, the yellow light signal is high, the yellow light drive signal is low, and the red light drive unit 61, the blue light drive unit 62, and the yellow light drive unit 63 do not drive the LED module 70, corresponding to the first case in Table 1.
[0049] Since the yellow light signal is low only when the first signal, the second signal, and the third inverted signal are all high, and otherwise the yellow light signal is high, the yellow light signal is high when the first signal is low, the second signal is low, or both the first signal and the second signal are low. The yellow light driving signal is low, the yellow light driving unit 63 does not drive the LED module 70, and the red light driving unit 61 or the blue light driving unit 62 drives the LED module, corresponding to cases 3, 4, 5, 6, 7, and 8 in Table 1.
[0050] The third NAND gate sub-unit 52c is connected to the inverting unit 51. The third NAND gate sub-unit 52c is used to receive the first signal, the second signal, and the third signal, and output a green light signal according to the first signal, the second signal, and the third signal. The green light signal is low only when the first signal, the second signal, and the third signal are all high; otherwise, the green light signal is high. The inverting unit 51 is also used to receive the green light signal and convert it into a green light driving signal. The green light driving unit 64 is connected to the inverting unit 51. The green light driving unit 64 is used to receive the green light driving signal and drive the light-emitting diode module 70 to emit green light according to the green light driving signal.
[0051] When the first monitoring voltage is higher than the first reference voltage, the second monitoring voltage is higher than the second reference voltage, and the third monitoring voltage is higher than the third reference voltage, the first signal, the second signal, and the third signal are all at a high level, the green light signal is at a low level, the green light driving signal is at a high level, and the green light driving unit 64 drives the light-emitting diode module 70 to emit green light according to the high-level green light driving signal, corresponding to the first case in Table 1.
[0052] When the first signal, the second signal, and the third signal are not all high, the green light signal is high, the green light driving signal is low, and the green light driving unit 64 does not drive the light-emitting diode module 70, corresponding to cases 2, 3, 4, 5, 6, 7, and 8 in Table 1.
[0053] Figures 2-18 In the circuit described, the first voltage to be measured is 12V, the second voltage to be measured is 3.3V, the third voltage to be measured is 4V, the reference voltage is VDD_5V, the first reference voltage is 1.52V, the second reference voltage is 1.79V, and the third reference voltage is 2.17V, are used as examples for illustration.
[0054] Figure 2 yes Figure 1 A schematic diagram of the intermediate conversion unit. (Refer to...) Figure 2 The conversion unit 11 includes an AC-DC converter 11a and an electrolytic capacitor CAP. The AC-DC converter 11a is provided with an ACN interface, an ACL interface, a +V0 interface, and a -V0 interface. The ACN interface and the ACL interface are used to connect to the main control board of the AC charging pile. The +V0 interface is connected to the positive terminal of the electrolytic capacitor CAP, and the -V0 interface is connected to the negative terminal of the electrolytic capacitor CAP. The AC-DC converter 11a is used to convert the input AC power into DC power, and the electrolytic capacitor CAP is used to filter the DC power.
[0055] Figure 3 yes Figure 1 Schematic diagram of the medium voltage regulator unit. (Refer to...) Figure 3 The voltage regulator unit 12 can be a three-terminal positive voltage linear regulator. The first terminal of the voltage regulator unit 12 is connected to the positive terminal of the electrolytic capacitor CAP, the second terminal of the voltage regulator unit 12 is grounded, and the third terminal of the voltage regulator unit 12 is used to provide the reference voltage. The voltage regulator unit 12 is used to step down the DC power to the reference voltage and regulate the reference voltage.
[0056] Figure 4 yes Figure 1 A schematic diagram of the indicator light unit. (Refer to...) Figure 4 The indicator unit 13 includes a first light-emitting diode (LED1) and a first resistor R1. The anode of the first LED1 is connected to the third terminal of the three-terminal positive voltage linear regulator, the cathode of the first LED1 is connected to the first terminal of the first resistor R1, and the second terminal of the first resistor R1 is grounded. When the three-terminal positive voltage linear regulator outputs the reference voltage, the first LED1 lights up.
[0057] Figure 5 yes Figure 1 A schematic diagram of the first voltage monitoring unit. (Refer to...) Figure 5 The first voltage monitoring unit 21 includes a fifth resistor R5 and a sixth resistor R6. The first end of the fifth resistor R5 is used to receive the first voltage to be measured. The second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is grounded. The second end of the fifth resistor R5 is used to output the first monitoring voltage.
[0058] Figure 6 yes Figure 1 A schematic diagram of the second voltage monitoring unit. (Refer to...) Figure 6 The second voltage monitoring unit 22 includes a ninth resistor R9 and a tenth resistor R10. The first end of the ninth resistor R9 is used to receive the first voltage to be measured. The second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is grounded. The second end of the ninth resistor R9 is used to output the second monitoring voltage.
[0059] Figure 7 yes Figure 1 A schematic diagram of the third voltage monitoring unit. (Refer to...) Figure 7 The third voltage monitoring unit 23 includes a thirteenth resistor R13 and a fourteenth resistor R14. The first end of the thirteenth resistor R13 is used to receive the first voltage to be measured. The second end of the thirteenth resistor R13 is connected to the first end of the fourteenth resistor R14. The second end of the fourteenth resistor R14 is grounded. The second end of the thirteenth resistor R13 is used to output the third monitoring voltage.
[0060] Figure 8 yes Figure 1 A schematic diagram of the first voltage reference unit. (Refer to...) Figure 8 The first voltage reference unit 31 includes a seventh resistor R7 and an eighth resistor R8. The first terminal of the seventh resistor R7 is connected to the third terminal of the three-terminal positive voltage linear regulator, and the second terminal of the seventh resistor R7 is connected to the first terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is grounded. The first terminal of the seventh resistor R7 is used to receive the reference voltage, and the second terminal of the seventh resistor R7 is used to output the first reference voltage.
[0061] Figure 9 yes Figure 1 A schematic diagram of the second voltage reference unit. (Refer to...) Figure 9The second voltage reference unit 32 includes an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 is connected to the third end of the voltage regulator unit 12, and the second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12. The second end of the twelfth resistor R12 is grounded. The first end of the eleventh resistor R11 is used to receive the reference voltage, and the second end of the eleventh resistor R11 is used to output the second reference voltage.
[0062] Figure 10 yes Figure 1 A schematic diagram of the third voltage reference unit. (Refer to...) Figure 10 The third voltage reference unit 33 includes a fifteenth resistor R15 and a sixteenth resistor R16. The first terminal of the fifteenth resistor R15 is connected to the third terminal of the three-terminal positive voltage linear regulator, and the second terminal of the fifteenth resistor R15 is connected to the first terminal of the sixteenth resistor R16. The second terminal of the sixteenth resistor R16 is grounded. The first terminal of the fifteenth resistor R15 is used to receive the reference voltage, and the second terminal of the fifteenth resistor R15 is used to output the third reference voltage.
[0063] Figure 11 yes Figure 1 A schematic diagram of the comparison module. (Refer to...) Figure 11 The comparison module 40 includes a four-channel voltage comparator 41, a second resistor R2, a third resistor R3, and a fourth resistor R4. The four-channel voltage comparator 41 is provided with interfaces IN1+, IN1-, IN2+, IN2-, IN3+, IN3-, IN4+, IN4-, VCC+, VCC-, OUT1, OUT2, OUT3, and OUT4.
[0064] The IN2+ interface is used to receive the first monitoring voltage (T12+), the IN2- interface is used to receive the first reference voltage (T12 1.52V), the OUT2 interface is connected to the first end of the second resistor R2, the second end of the second resistor R2 is used to receive the reference voltage, and the OUT2 interface is used to output the first signal (T12-OUT2). The four-channel voltage comparator 41 is used to compare the first monitoring voltage with the first reference voltage. When the first monitoring voltage is not lower than the first reference voltage, the four-channel voltage comparator 41 controls the OUT2 interface to be in a high-impedance state, and the first signal is pulled high by the second resistor R2. When the first monitoring voltage is lower than the first reference voltage, the four-channel voltage comparator 41 controls the OUT2 interface to be grounded, and the first signal is pulled low.
[0065] The IN1+ interface is used to receive the second monitoring voltage (T3.3V+), the IN1- interface is used to receive the second reference voltage (T3.3 1.79V), the OUT1 interface is connected to the first end of the third resistor R3, the second end of the third resistor R3 is used to receive the reference voltage, and the OUT1 interface is used to output the second signal (T3.3-OUT1). The four-channel voltage comparator 41 is used to compare the second monitoring voltage with the second reference voltage. When the second monitoring voltage is not lower than the second reference voltage, the four-channel voltage comparator 41 controls the OUT1 interface to be in a high-impedance state, and the second signal is pulled high by the third resistor R3. When the second monitoring voltage is lower than the second reference voltage, the four-channel voltage comparator 41 controls the OUT1 interface to be grounded, and the second signal is pulled low.
[0066] The IN3+ interface is used to receive the third monitoring voltage (T4V+), the IN3- interface is used to receive the third reference voltage (T4_2.17V), the OUT3 interface is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is used to receive the reference voltage, and the OUT3 interface is used to output the third signal (T4-OUT3). The four-channel voltage comparator 41 is used to compare the third monitoring voltage with the third reference voltage. When the third monitoring voltage is not lower than the third reference voltage, the four-channel voltage comparator 41 controls the OUT3 interface to be in a high-impedance state, and the third signal is pulled high by the fourth resistor R4. When the third monitoring voltage is lower than the third reference voltage, the four-channel voltage comparator 41 controls the OUT3 interface to be grounded, and the third signal is pulled low.
[0067] Figure 12 yes Figure 1 A schematic diagram of the inverting cell. (Refer to...) Figure 12 The inverter unit 51 includes a six-channel inverter 51a and a first capacitor C1. The six-channel inverter 51a includes an 1A interface, a 1Y interface, a 2A interface, a 2Y interface, a 3A interface, a 3Y interface, a 4A interface, a 4Y interface, a 5A interface, a 5Y interface, a 6A interface, a 6Y interface, a VCC interface, and a GND interface.
[0068] The 1A interface is used to receive the second signal, and the 1Y interface is used to output the second inverted signal (NOT-T3.3). The 2A interface is used to receive the third signal, and the 2Y interface is used to output the third inverted signal (NOT-T4). The 3A interface is used to receive the blue light signal (BLUE), and the 3Y interface is used to output the blue light drive signal (BLUE RUN). The 4A interface is used to receive the yellow light signal (YELLOW), and the 4Y interface is used to output the yellow light drive signal (YELLOW RUN). The 5A interface is used to receive the green light signal (GREEN), and the 5Y interface is used to output the green light drive signal (GREEN RUN). The 6A interface is used to receive the first signal, and the 6Y interface is used to output the red light drive signal (RED RUN). The GND interface is used for grounding, and the VCC interface is connected to the first terminal of the first capacitor C1. The first terminal of the first capacitor C1 is also used to receive the reference voltage, and the second terminal of the first capacitor C1 is used for grounding.
[0069] Figure 13 yes Figure 1 A schematic diagram of a NAND gate unit. (Refer to...) Figure 13 The NAND gate unit 52 includes a three-input NAND gate device and a second capacitor C2. The three-input NAND gate device has a VCC interface and a GND interface. The VCC interface is connected to the first terminal of the second capacitor C2, which is also used to receive the reference voltage. The second terminal of the second capacitor C2 is grounded, and the GND interface is grounded. The three-input NAND gate device includes a first NAND gate subunit 52a, a second NAND gate subunit 52b, and a third NAND gate subunit 52c.
[0070] The first NAND gate subunit 52a is provided with a 2A interface, a 2B interface, a 2C interface, and a 2Y interface. The 2A interface is used to receive the first signal, the 2B interface is used to receive the second inverted signal, the 2C interface is used to receive the reference voltage, and the 2Y interface is used to output the blue light signal. The blue light signal is low only when both the first signal and the second inverted signal are high; otherwise, the blue light signal is always high.
[0071] The second NAND gate subunit 52b is provided with a 3C interface, a 3B interface, a 3A interface, and a 3Y interface. The 3C interface is used to receive the third inverted signal, the 3B interface is used to receive the second signal, the 3A interface is used to receive the first signal, and the 3Y interface is used to output the yellow light signal. The yellow light signal is low only when the first signal, the second signal, and the third inverted signal are all high; otherwise, the yellow light signal is high.
[0072] The third NAND gate subunit 52c is provided with an 1A interface, an 1B interface, an 1C interface, and a 1Y interface. The 1A interface is used to receive the first signal, the 1B interface is used to receive the second signal, the 1C interface is used to receive the third signal, and the 1Y interface is used to output the green light signal. The green light signal is low only when the first signal, the second signal, and the third signal are all high; otherwise, the green light signal is high.
[0073] The first NAND gate sub-unit 52a, the second NAND gate sub-unit 52b, and the third NAND gate sub-unit 52c are all connected to the first terminal of the second capacitor C2. The first terminal of the second capacitor C2 also receives the reference voltage. The second terminal of the second capacitor C2 is grounded. The first NAND gate sub-unit 52a, the second NAND gate sub-unit 52b, and the third NAND gate sub-unit 52c are all grounded.
[0074] Figure 14 yes Figure 1 A schematic diagram of the red light drive unit. Figure 15 yes Figure 1 A schematic diagram of the blue LED driver unit. Figure 16 yes Figure 1 A schematic diagram of the yellow light drive unit. Figure 17 yes Figure 1 A schematic diagram of the green light drive unit. Figure 18 yes Figure 1 A schematic diagram of the LED module. (Refer to...) Figure 14 , Figure 15 , Figure 16 , Figure 17 and Figure 18The red light driving unit 61 includes a twentieth resistor R20, a first NPN transistor Q1, and an eighteenth resistor R18. The light-emitting diode module 70 includes a second light-emitting diode LED2. The first terminal of the twentieth resistor R20 receives the red light driving signal. The second terminal of the twentieth resistor R20 is connected to the base of the first NPN transistor Q1. The emitter of the first NPN transistor Q1 is grounded. The collector of the first NPN transistor Q1 is connected to the first terminal of the eighteenth resistor R18. The second terminal of the eighteenth resistor R18 emits a red light display signal (LED_R). The cathode of the second light-emitting diode LED2 receives the red light display signal, and the anode of the second light-emitting diode LED2 is connected to the reference voltage. The second light-emitting diode LED2 emits a red light. When the red light driving signal is high, the collector and emitter of the first NPN transistor Q1 are turned on, the red light display signal is low, and the second light-emitting diode LED2 emits red light; when the red light driving signal is low, the collector and emitter of the first NPN transistor Q1 are turned off, the red light display signal is high, and the second light-emitting diode LED2 is turned off.
[0075] The blue light driving unit 62 includes a 24th resistor R24, a 3rd NPN transistor Q3, and a 22nd resistor R22. The LED module 70 also includes a 3rd LED. The first terminal of the 24th resistor R24 receives the blue light driving signal. The second terminal of the 24th resistor R24 is connected to the base of the 3rd NPN transistor Q3. The emitter of the 3rd NPN transistor Q3 is grounded. The collector of the 3rd NPN transistor Q3 is connected to the first terminal of the 22nd resistor R22. The second terminal of the 22nd resistor R22 emits a blue light display signal (LED_B). The cathode of the 3rd LED is used to receive the blue light display signal, and the anode of the 3rd LED is used to receive the reference voltage. The 3rd LED emits blue light. When the blue light driving signal is high, the collector and emitter of the third NPN transistor Q3 are turned on, the blue light display signal is low, and the third light-emitting diode LED3 emits blue light; when the blue light driving signal is low, the collector and emitter of the third NPN transistor Q3 are turned off, the blue light display signal is high, and the third light-emitting diode LED3 is turned off.
[0076] The yellow light driving unit 63 includes a twenty-first resistor R21, a second NPN transistor Q2, a seventeenth resistor R17, and a nineteenth resistor R19. The light-emitting diode module 70 includes a fourth light-emitting diode LED4. The first terminal of the twenty-first resistor R21 receives the yellow light driving signal. The second terminal of the twenty-first resistor R21 is connected to the base of the second NPN transistor Q2. The emitter of the second NPN transistor Q2 is grounded. The collector of the second NPN transistor Q2 is connected to the first terminals of the seventeenth resistor R17 and the nineteenth resistor R19. The second terminal of the seventeenth resistor R17 emits the red light display signal. The cathode of the second light-emitting diode LED2 receives the red light display signal. The second terminal of the nineteenth resistor R19 emits a green light display signal (LED_G). The cathode of the fourth light-emitting diode LED4 receives the green light display signal, and the anode of the fourth light-emitting diode LED4 receives the reference voltage. The fourth light-emitting diode LED4 emits green light. When the yellow light driving signal is high, the second NPN transistor Q2 is turned on, the second light-emitting diode LED2 emits red light and the fourth light-emitting diode LED4 emits green light, and the combination of red light and green light is yellow light.
[0077] The green light driving unit 64 includes a 25th resistor R25, a 23rd resistor R23, and a 4th NPN transistor Q4. The first terminal of the 25th resistor R25 receives the green light driving signal, and the second terminal of the 25th resistor R25 is connected to the base of the 4th NPN transistor Q4. The emitter of the 4th NPN transistor Q4 is grounded, and the collector of the 4th NPN transistor Q4 is connected to the first terminal of the 23rd resistor R23. The second terminal of the 23rd resistor R23 is connected to the cathode of the 4th light-emitting diode LED4. When the green light driving signal is high, the 4th NPN transistor Q4 is turned on, and the 4th light-emitting diode LED4 emits green light.
[0078] The implementation principle of the self-diagnosis and status light indication system for AC charging piles in this application embodiment is as follows: By constructing a pure hardware analog circuit system, the key power supply voltage inside the AC charging pile is monitored in real time and in parallel. The monitoring results are then converted into unique and clear visual status indications through a priority encoding module 50 with built-in priorities. This system does not rely on a microprocessor (MCU) or software program, thus fundamentally avoiding diagnostic failures caused by software malfunctions, system crashes, or electromagnetic interference, significantly improving the system's anti-interference capability, reliability, and response speed.
[0079] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A self-diagnostic and status light indication system for AC charging piles, characterized in that, include: The voltage monitoring module (20) is used to connect to the main control board of the AC charging pile and generate a first monitoring voltage based on the first test voltage received from the main control board of the AC charging pile, generate a second monitoring voltage based on the second test voltage, and generate a third monitoring voltage based on the third test voltage. A voltage reference module (30) is used to connect to the main control board of the AC charging pile and generate a first reference voltage, a second reference voltage and a third reference voltage according to the AC power received from the main control board of the AC charging pile. A comparison module (40) is connected to the voltage monitoring module (20) and the voltage reference module (30). The comparison module (40) is used to receive the first monitoring voltage, the second monitoring voltage, the third monitoring voltage, the first reference voltage, the second reference voltage and the third reference voltage, and compare the first monitoring voltage with the first reference voltage to generate a first signal, compare the second monitoring voltage with the second reference voltage to generate a second signal, and compare the third monitoring voltage with the third reference voltage to generate a third signal. A priority encoding module (50) is connected to the comparison module (40). The priority encoding module (50) is used to receive the first signal, the second signal, and the third signal, and generate a red light driving signal, a blue light driving signal, a yellow light driving signal, and a green light driving signal based on the first signal, the second signal, and the third signal. Specifically, when the first signal is low, the red light driving signal is high, and the blue light driving signal, the yellow light driving signal, and the green light driving signal are all low. When the first signal is high and the second signal is low, the blue light driving signal is high, and the yellow light driving signal and the green light driving signal are both low. When the first signal and the second signal are both high and the third signal is low, the yellow light driving signal is high and the green light driving signal is low. When the first signal, the second signal, and the third signal are all high, the green light driving signal is high.
2. The AC charging pile self-diagnosis and status light indication system according to claim 1, characterized in that, The priority encoding module (50) includes an inverting unit (51), which is connected to the comparison module (40). The inverting unit (51) is used to receive the first signal to generate the red light driving signal, receive the second signal to generate the second inverted signal, and receive the third signal to generate the third inverted signal.
3. The AC charging pile self-diagnosis and status light indication system according to claim 2, characterized in that, The priority encoding module (50) further includes a NAND gate unit (52), which includes a first NAND sub-unit (52a), a second NAND sub-unit (52b), and a third NAND sub-unit (52c). The first NAND sub-unit (52a), the second NAND sub-unit (52b), and the third NAND sub-unit (52c) are all connected to the comparison module (40) and the inverting unit (51). The first NAND sub-unit (52a) is used to receive the first signal and the second inverted signal. The first NAND gate (52a), the second NAND gate (52b), and the third NAND gate (52c) are configured to receive the first signal, the second signal, and the third inverted signal to generate a yellow light signal; the third NAND gate (52c) is configured to receive the first signal, the second signal, and the third signal to generate a green light signal; wherein, the first NAND gate (52a), the second NAND gate (52b), and the third NAND gate (52c) are configured to output a low-level signal only when all received signals are high-level.
4. The AC charging pile self-diagnosis and status light indication system according to claim 3, characterized in that, The inverting unit (51) is also used to receive the blue light signal to generate the blue light driving signal, receive the yellow light signal to generate the yellow light driving signal, and receive the green light signal to generate the green light driving signal.
5. The AC charging pile self-diagnosis and status light indication system according to claim 1, characterized in that, When the first monitoring voltage is lower than the first reference voltage, the first signal is at a low level; when the first monitoring voltage is higher than the first reference voltage, the first signal is at a high level. When the second monitoring voltage is lower than the second reference voltage, the second signal is at a low level; when the second monitoring voltage is higher than the second reference voltage, the second signal is at a high level. When the third monitoring voltage is lower than the third reference voltage, the third signal is at a low level; when the third monitoring voltage is higher than the third reference voltage, the third signal is at a high level.
6. The AC charging pile self-diagnosis and status light indication system according to claim 1, characterized in that, The voltage monitoring module (20) includes a first voltage monitoring unit (21), a second voltage monitoring unit (22), and a third voltage monitoring unit (23). The first voltage monitoring unit (21), the second voltage monitoring unit (22), and the third voltage monitoring unit (23) are all connected to the main control board of the AC charging pile. The first voltage monitoring unit (21) is used to receive the first voltage to be measured in order to generate the first monitoring voltage. The second voltage monitoring unit (22) is used to receive the second voltage to be measured in order to generate the second monitoring voltage. The third voltage monitoring unit (23) is used to receive the third voltage to be measured in order to generate the third monitoring voltage.
7. The AC charging pile self-diagnosis and status light indication system according to claim 1, characterized in that, It also includes an AC input and DC conversion module (10), which is used to connect to the main control board of the AC charging pile and to convert the AC power supply into a DC reference voltage.
8. The AC charging pile self-diagnosis and status light indication system according to claim 7, characterized in that, The voltage reference module (30) includes a first voltage reference unit (31), a second voltage reference unit (32), and a third voltage reference unit (33). The first voltage reference unit (31), the second voltage reference unit (32), and the third voltage reference unit (33) are all connected to the AC input and DC conversion module (10). The first voltage reference unit (31) is used to generate the first reference voltage based on the reference voltage. The second voltage reference unit (32) is used to generate the second reference voltage based on the reference voltage. The third voltage reference unit (33) is used to generate the third reference voltage based on the reference voltage.
9. The AC charging pile self-diagnosis and status light indication system according to claim 1, characterized in that, The LED driving module (60) includes a red light driving unit (61), a blue light driving unit (62), a yellow light driving unit (63), and a green light driving unit (64). The red light driving unit (61), the blue light driving unit (62), the yellow light driving unit (63), and the green light driving unit (64) are all connected to the priority encoding module (50). The red light driving unit (61) is used to receive the red light driving signal to generate a red light display signal. The blue light driving unit (62) is used to receive the blue light driving signal to generate the blue light display signal. The yellow light driving unit (63) is used to receive the yellow light driving signal to generate the red light display signal and the green light display signal. The green light driving unit (64) is used to receive the green light driving signal to generate the green light display signal.
10. The AC charging pile self-diagnosis and status light indication system according to claim 9, characterized in that, The light-emitting diode module (70) is connected to the light-emitting diode driving module (60). The light-emitting diode module (70) is used to receive the red light display signal to emit red light, receive the blue light display signal to emit blue light, receive the red light display signal and the green light display signal to emit yellow light, and receive the green light display signal to emit green light.