Environment-friendly pulse dust cleaning control system with self-diagnosis function and control method thereof

Abstract

The application discloses an environment-friendly pulse ash removal control system with a self-diagnosis function and a control method thereof. The system comprises a main control module, a main output circuit and an overcurrent detection circuit. The driving input end of the main output circuit is connected with the main control module. The first output end of the main output circuit is connected with the live wire of an alternating current power supply. The second output end of the main output circuit is connected with a load. The main control module is connected with the load through an output stage thyristor. The load is connected with the output stage thyristor in a one-to-one correspondence. The main output circuit is connected with the overcurrent detection circuit through each load and the corresponding output stage thyristor. The signal output end of the overcurrent detection circuit is connected with the main control module. The overcurrent detection circuit is used for collecting the working current of the load in real time and converting the working current into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold value, and an overcurrent detection signal is output to the main control module. The system realizes fault detection on the output point, executes a protection action in time, has high inspection efficiency and discovers faults in time.

Description

Technical Field

[0001] This invention relates to the field of dust removal equipment control technology, and in particular to an environmentally friendly pulse cleaning control system and its control method with self-diagnostic function. Background Technology

[0002] In industrial dust removal systems, programmable logic controllers (PLCs) or dedicated controllers are typically deployed to drive hundreds of electromagnetic pulse valves to perform pulse-jet cleaning, enabling online cleaning of filter bags. To simplify the drive circuit structure and reduce hardware costs, the on / off control of AC electromagnetic pulse valves commonly uses triacs as the switching element. In a 50Hz AC power supply circuit, the triac receives the gate trigger signal through a zero-crossing trigger optocoupler to connect the power supply to the load.

[0003] However, in AC power supply circuits, the turn-off characteristics of a bidirectional thyristor are limited by its physical mechanism: once triggered, the bidirectional thyristor will remain on even after the gate trigger signal is removed, until the current flowing through the main circuit decays to below the holding current of the bidirectional thyristor due to the AC zero-crossing, at which point the bidirectional thyristor will automatically turn off. In a 50Hz AC system, the on-time of the bidirectional thyristor after zero-crossing triggering is approximately 10ms. Therefore, the turn-off characteristics of the bidirectional thyristor result in it being in an uncontrollable, continuous on-state for about 10ms after zero-crossing triggering. Conventional fuse protection mechanisms, with a melting response time of approximately 10ms, are insufficient to effectively cut off the circuit before the bidirectional thyristor undergoes thermal breakdown due to overcurrent, leading to irreversible thermal breakdown and short-circuit failure. This results in the bidirectional thyristor being in a permanently low-resistance on-state, unable to turn off the load.

[0004] However, most existing dust removal control systems employ passive protection architectures such as fuse blowing or relay isolation, which can only achieve passive physical disconnection and cannot protect the bidirectional thyristor in a timely manner. Moreover, they lack detection and protection of output points, and fault diagnosis relies on manual point-by-point inspection, resulting in high operation and maintenance costs, low inspection efficiency, and delayed fault detection. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an environmentally friendly pulse cleaning control system and its control method with self-diagnostic function, so as to solve the problems that the overcurrent protection scheme of the existing dust removal control system cannot protect the bidirectional thyristor in time, lacks detection and protection of the output point, and relies on manual point-by-point inspection for fault diagnosis, resulting in high operation and maintenance costs, low inspection efficiency and delayed fault detection.

[0006] In a first aspect, the present invention provides an environmentally friendly pulse cleaning control system with self-diagnostic function, including a main control module, a main output circuit, and an overcurrent detection circuit. The drive input terminal of the main output circuit is connected to the main control module, the first output terminal of the main output circuit is connected to the live wire of the AC power supply, and the second output terminal of the main output circuit is connected to the load. The main control module is connected to the load through an output stage thyristor, and the load corresponds one-to-one with the output stage thyristor and is connected to the main control module. The main output circuit is connected to the overcurrent detection circuit through each load and the corresponding output stage thyristor. The signal output terminal of the overcurrent detection circuit is connected to the main control module. The overcurrent detection circuit is used to collect the operating current of the load in real time and convert it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold to output an overcurrent detection signal to the main control module.

[0007] Secondly, the present invention provides a control method for an environmentally friendly pulse cleaning control system with self-diagnostic function, applied to the aforementioned environmentally friendly pulse cleaning control system with self-diagnostic function. The control method includes the following steps: the main control module sequentially initiates output detection of each load according to a preset inspection cycle, so as to output a load control signal to the output stage thyristor of one of the loads to be detected; the main control module provides a drive signal to the main output circuit to drive the main output circuit to work; the main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid; when the overcurrent detection signal is valid... When an effective overcurrent detection signal is received, it is determined that the load has an overcurrent or short-circuit fault. The main control module stops outputting drive signals to the main output circuit and stops outputting load control signals to the corresponding output stage thyristor, thereby disconnecting the corresponding load from the main output circuit and shutting down the corresponding output stage thyristor. The load is recorded as a fault output point, a fault alarm is generated and output, the current load output detection ends, and the next load is selected as the load to be detected. When the overcurrent detection signal is invalid, it is determined that the load is working normally, the current load output detection ends, and the next load is selected as the load to be detected.

[0008] Thirdly, the present invention provides a control method for an environmentally friendly pulse cleaning control system with self-diagnostic function, applied to the aforementioned environmentally friendly pulse cleaning control system with self-diagnostic function. The control method includes the following steps: stopping the output drive signal to the main output circuit through the main control module; sequentially starting the output detection of each load according to a preset inspection cycle through the main control module, so as to output a load control signal to the output stage thyristor of one of the loads to be detected; acquiring the status monitoring signal output by the open circuit detection unit through the main control module, and determining whether the status monitoring signal is high level; when the status monitoring signal is low level, determining that there is an open circuit fault or poor contact fault in the connection between the load and the main output circuit, and / or that there is an open circuit fault or poor contact fault in the connection between the load and the main control module, recording that the load has a disconnected output point, generating and outputting a disconnection alarm, ending the output detection of the current load, and obtaining the next load as the load to be detected; when the status monitoring signal is high level, providing a drive signal to the main output circuit through the main control module to drive the main output circuit to work; acquiring the current status monitoring signal output by the open circuit detection unit through the main control module, and determining the current The system checks whether the frequency of the status monitoring signal matches the power frequency of the AC power supply. If the frequency of the current status monitoring signal does not match the power frequency of the AC power supply, a drive fault is identified, the load is recorded as having a disconnection output point, a disconnection alarm is generated and output, the output detection of the current load ends, and the next load is selected as the load to be detected. If the frequency of the current status monitoring signal matches the power frequency of the AC power supply, the main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid. If the overcurrent detection signal is valid, the system determines whether the overcurrent detection signal is valid. If an overcurrent or short-circuit fault occurs in the load, the main control module stops outputting drive signals to the main output circuit and stops outputting load control signals to the corresponding output stage thyristor. This disconnects the corresponding load from the main output circuit and shuts down the corresponding output stage thyristor. The load is recorded as a fault output point, a fault alarm is generated and output, the current load output detection ends, and the next load is selected as the load to be detected. If the overcurrent detection signal is invalid, the load is determined to be operating normally, the current load output detection ends, and the next load is selected as the load to be detected.

[0009] The beneficial technical effects of this invention are as follows: The environmentally friendly pulse cleaning control system with self-diagnostic function of this invention is configured with a main output circuit that connects the drive input terminal to the main control module and the first and second output terminals to the live wire of the AC power supply and the load, respectively, to supply power to the load. The main output circuit is connected to an overcurrent detection circuit through each load and the corresponding output stage thyristor. The overcurrent detection circuit collects the working current of each load in real time and converts it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold, and an overcurrent detection signal is output to the main control module to realize overcurrent detection of the working current of each load, thereby detecting faults at the output points of the control system. The main control module can then execute protection actions in a timely manner based on the detection results and generate a fault alarm, effectively protecting the devices connected to the faulty output point, shutting down the drive in time, realizing rapid protection of the output stage thyristor, preventing device damage, and allowing operators to handle faulty output points in a timely manner to avoid damage to the entire machine. Fault diagnosis can be carried out point by point without relying on manual inspection, realizing automatic inspection and self-diagnosis, with low operation and maintenance costs, and improving inspection efficiency and preventing delayed fault detection. Furthermore, the main control module is connected to the load via an output stage thyristor, allowing for individual control of the corresponding load's output. This facilitates troubleshooting of faulty output points and prevents them from affecting the normal operation of the dust removal equipment, resulting in high reliability. The control method of the environmental pulse cleaning control system with self-diagnostic function of this invention also possesses the above-mentioned functions. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the framework of an environmentally friendly pulse cleaning control system with self-diagnostic function in one embodiment of the present invention; Figure 2 This is a circuit diagram of an environmentally friendly pulse cleaning control system with self-diagnostic function according to an embodiment of the present invention; Figure 3 A flowchart illustrating the control method of the environmentally friendly pulse cleaning control system with self-diagnostic function provided in an embodiment of the present invention; Figure 4 A schematic diagram illustrating the specific flow of the control method for the environmentally friendly pulse cleaning control system with self-diagnostic function provided in this embodiment of the invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1 , Figure 1 This is a schematic diagram of the framework of an environmentally friendly pulse cleaning control system with self-diagnostic function according to an embodiment of the present invention. The environmentally friendly pulse cleaning control system with self-diagnostic function includes a main control module 11, a main output circuit 12, and an overcurrent detection circuit 13. The drive input terminal of the main output circuit 11 is connected to the main control module 11. The first output terminal of the main output circuit 12 is connected to the live wire of the AC power supply 20. The second output terminal of the main output circuit 12 is connected to the load 14. The main control module 11 is connected to the load 14 through the output stage thyristor 15. The load 14 and the output stage thyristor 15 are one-to-one correspondence and connected. The main output circuit 12 is connected to the overcurrent detection circuit 13 through each load 14 and the corresponding output stage thyristor 15. The signal output terminal of the overcurrent detection circuit 13 is connected to the main control module 11. The overcurrent detection circuit 13 is used to collect the working current of the load 14 in real time and convert it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold to output an overcurrent detection signal to the main control module 11.

[0014] The load 14 can be an electromagnetic pulse valve, and there are multiple loads 14. The second output terminal of the main output circuit 12 is connected to multiple loads 14 respectively. Each load 14 is connected in parallel to each other, so that the main output circuit 12 can realize the drive control of multiple loads 14, thereby reducing the bill of materials cost. The main control module 11 can be a CPU (Central Processing Unit). After receiving a valid overcurrent detection signal, the main control module 11 can immediately stop outputting drive signals to the main output circuit 12 and stop outputting load control signals to the corresponding output stage thyristor 15. It records the corresponding load 14 as a fault output point, so as to shut down the drive in time, realize the rapid protection of the output stage thyristor 15, and automatically clear the fault output point in time, generate a fault alarm, so that the operator can deal with the fault output point in time, and control the remaining output points to work normally after the fault output point is cleared. The environmentally friendly pulse cleaning control system with self-diagnostic function is configured to supply power to the loads 14 via a main output circuit 12, whose drive input terminal is connected to the main control module 11 and whose first and second output terminals are respectively connected to the live wire of the AC power supply 20 and the load. The main output circuit 12, through each load 14 and the corresponding output stage thyristor 15, is connected to an overcurrent detection circuit 13. This circuit collects the operating current of each load 14 in real time and converts it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold, and an overcurrent detection signal is output to the main control module 11. The system enables overcurrent detection of the operating current of each load 14, thereby detecting faults at the output points of the control system. The main control module 11 can then promptly execute protective actions and generate fault alarms based on the detection results, effectively protecting devices connected to faulty output points, promptly shutting down drives, and achieving rapid protection of the output-stage thyristor 15 to prevent device damage. Operators can also promptly address faulty output points, avoiding damage to the entire machine. Fault diagnosis can be performed point-by-point without manual intervention, achieving automatic inspection and self-diagnosis, resulting in low maintenance costs and improved inspection efficiency, preventing delayed fault detection. Furthermore, the main control module 11 is connected to the load 14 via the output-stage thyristor 15, allowing the corresponding load 14's output to be controlled individually through the output-stage thyristor 15. This facilitates troubleshooting of faulty output points, preventing them from affecting the normal operation of the dust removal equipment, and ensuring high reliability.

[0015] Combination Figure 2 , Figure 2 The circuit diagram of an environmentally friendly pulse cleaning control system with self-diagnostic capabilities is shown. Since the loads are connected in parallel and their circuit connections within the control system are similar, then... Figure 2 Only two loads are shown here; in real-world applications, the number of loads can be hundreds. For example... Figure 2As shown, the two loads can be denoted as LOAD1 and LOAD2, respectively, and the corresponding output stage thyristors are denoted as Q3 and Q4, respectively. In some embodiments, the overcurrent detection circuit 13 includes a first transistor Q1, a seventh transistor Q7, a third Zener diode D3, a ninth resistor R9, and a sampling circuit 131. The base of the first transistor Q1 is connected to the sampling circuit 131 and the second connection terminal of the output stage thyristors Q3 and Q4 via the ninth resistor R9. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to the collector of the seventh transistor Q7 and then connected to a pull-up resistor R10 via the third Zener diode D3. The first end of the pull-up resistor R10 is connected to the supply voltage VCC, and the second end of the pull-up resistor R10 is connected to the anode of the third Zener diode D3. The cathode of diode D3 is connected to the collector of the first transistor Q1 and the collector of the seventh transistor Q7. The connection node of the third Zener diode D3 and the pull-up resistor R10 is connected to the overcurrent detection terminal OL of the main control module to output an overcurrent detection signal. The emitter of the seventh transistor Q7 is connected to the base of the first transistor Q1 and the ninth resistor R9. The base of the seventh transistor Q7 is connected to the eighteenth grounding resistor R18. The sampling circuit 131 is connected to the second connection terminal of the output stage thyristors Q3 and Q4. The first connection terminal of the output stage thyristor Q3 is connected to the corresponding load LOAD1, and the first connection terminal of the output stage thyristor Q4 is connected to the corresponding load LOAD2.

[0016] The ninth resistor R9 is used for current limiting. A sampling circuit 131, connected to the second terminals of the output stage thyristors Q3 and Q4 corresponding to each load LOAD1 and LOAD2, is used to collect the operating current of each load LOAD1 and LOAD2 and convert it into a corresponding current sampling signal. The first transistor Q1 and the seventh transistor Q7, connected to the collector and pull-up resistor R10, respectively compare the current sampling signals of the positive and negative half-cycles of the AC power supply 20 with a preset overcurrent threshold for overcurrent detection. When the preset overcurrent threshold is exceeded, a valid overcurrent detection signal is output to the main control module; otherwise, an invalid overcurrent detection signal is output to the main control module. The preset overcurrent threshold can be the transistor's on-time threshold. Furthermore, using transistors for detection and comparison results in a nanosecond-level response time, providing a fast response speed and timely feedback to the main control module. This allows the main control module to quickly identify fault output points. Combined with the zero-crossing shutdown logic, the main control module can promptly execute corresponding protection actions to prevent device damage. Under normal operating conditions, if the load's operating current is within the rated range (less than 0.1A), during the positive half-cycle of the AC power supply, transistor Q7 is cut off. The current sampling signal corresponding to the load is lower than the conduction threshold of transistor Q1, so transistor Q1 is cut off. The overcurrent detection terminal OL of the main control module receives a high level, which is an invalid overcurrent detection signal. During the negative half-cycle of the AC power supply, transistor Q1 is cut off. The current sampling signal corresponding to the load is lower than the conduction threshold of transistor Q7, so transistor Q7 is cut off. The overcurrent detection terminal OL of the main control module receives a high level, which is an invalid overcurrent detection signal. The main control module determines that the corresponding load is operating normally based on the invalid overcurrent detection signal. Under overcurrent or short-circuit conditions, if the load's operating current exceeds the rated range, the operating current will not be less than 0.1A. During the positive half-cycle of the AC power supply, transistor Q7 is cut off, and the current sampling signal corresponding to the load is not lower than the conduction threshold of transistor Q1. Transistor Q1 is turned on, and the pull-up resistor R10 divides the voltage. The overcurrent detection terminal OL of the main control module receives a low level, which is a valid overcurrent detection signal. During the negative half-cycle of the AC power supply, transistor Q1 is cut off, and the current sampling signal corresponding to the load is not lower than the conduction threshold of transistor Q7. Transistor Q7 is turned on, and the pull-up resistor R10 divides the voltage. The overcurrent detection terminal OL of the main control module receives a low level, which is a valid overcurrent detection signal. When the main control module receives a valid overcurrent detection signal, it knows that the corresponding load is a fault output point. The main control module immediately stops outputting drive signals and load control signals to achieve rapid protection.

[0017] Preferably, both the first transistor Q1 and the seventh transistor Q7 are NPN transistors.

[0018] Specifically, the sampling circuit 131 includes a current sampling resistor R8 and a rectification and limiting unit. The rectification and limiting unit is connected in parallel with the current sampling resistor R8, so that the two ends of the rectification and limiting unit are respectively connected to the two ends of the current sampling resistor R8, for bidirectional limiting and rectification of the current sampling resistor R8. The rectification and limiting unit includes a first diode D1 and a second diode D2 connected in reverse parallel. The first end of the current sampling resistor R8 is connected to the second connection terminal of the output stage thyristors Q3 and Q4 and the ninth resistor R9. The second end of the current sampling resistor R8 is grounded. The cathode of the first diode D1 is connected to the anode of the second diode D2 as the first end of the rectification and limiting unit, which is connected to the first end of the current sampling resistor R8, the second connection terminal of the output stage thyristors Q3 and Q4, and the ninth resistor R9. The anode of the first diode D1 and the cathode of the second diode D2 are connected as the second end of the rectification and limiting unit, which is connected to the second end of the current sampling resistor R8 and ground. A first grounding capacitor C1 is electrically connected at the connection node between the ninth resistor R9 and the base of the first transistor D1. The neutral wire of the AC power supply can be grounded. By adjusting the resistance value of the current sampling resistor R8, different current thresholds can be detected and compared, making the current detection circuit 13 highly versatile. By setting a rectifier limiting unit with bidirectional limiting in the sampling circuit 131, the current sampling signal is limited to a safe voltage range, which is beneficial to protecting the subsequent circuits of the sampling circuit 131 in the overcurrent detection circuit 13.

[0019] Specifically, the control terminal of the output stage thyristor Q3 is connected to the corresponding coil drive terminal V1 of the main control module through the corresponding connection resistor R7, and the control terminal of the output stage thyristor Q4 is connected to the corresponding coil drive terminal V2 of the main control module through the corresponding connection resistor R11. The main control module outputs corresponding load control signals to the control terminals of the corresponding output stage thyristors Q3 and Q4 through the coil drive terminals V1 and V2, respectively, to control and trigger the output stage thyristors Q3 and Q4 to conduct, thereby controlling the output of the corresponding loads LOAD1 and LOAD2, so that loads LOAD1 and LOAD2 work.

[0020] Continue to refer to Figure 1Preferably, in some embodiments, the environmentally friendly pulse cleaning control system with self-diagnostic function further includes an open-circuit detection circuit 16. The input terminal of the open-circuit detection circuit 16 is electrically connected to the connection node between the main output circuit 12 and the load 14, and the output terminal of the open-circuit detection circuit 16 is connected to the main control module 11. It is used to detect the connection loop status between the main output circuit 12 and the load 14 and output a status monitoring signal to the main control module 11. The status monitoring signal is a pulse signal. The connection loop between the main output circuit 12 and the load 14 is a complete loop formed between the main control module 11, the main output circuit 12, and the load 14. Therefore, the connection loop status between the main output circuit 12 and the load 14 includes the connection status between the main control module 11 and the main output circuit 12, the connection status between the main output circuit 12 and the load 14, and the connection status between the load 14 and the main control module 11 through the output stage thyristor 15. By setting up an open-circuit detection circuit 16 to detect the connection loop status between the main output circuit 12 and the load 14, fault output points of loads that do not operate normally according to the drive signals and load control signals of the main control module 11 are recorded and alarmed, preventing some loads from not working for a long time and thus preventing damage to the whole machine. The main control module 11 can control the start and stop of the drive signal output and continuously control the output load control signal to achieve comprehensive detection of the connection loop status between the main output circuit 12 and the load 14 under different operating conditions. This allows the main control module 11 to judge based on the corresponding status monitoring signals, thereby detecting whether the connection loop is normal. Performing open-circuit detection before overcurrent detection ensures the integrity of the connection loop, avoids false judgments of overcurrent detection due to incomplete connection loops, reduces the false judgment rate, improves detection reliability, and expands the self-diagnostic function. Moreover, by detecting the connection loop status between the main output circuit 12 and the corresponding load 14 through the open-circuit detection circuit 16, output points that cannot be turned off are checked, preventing damage caused by prolonged power-on due to the inability to turn off the output point connection.

[0021] Continue to refer to Figure 2Preferably, the open-circuit detection circuit 16 includes a fifth transistor Q5, a fourth Zener diode D4, and a voltage divider circuit. The cathode of the fourth Zener diode D4 is connected to the second output terminal of the main output circuit 12 and the first terminals of the loads LOAD1 and LOAD2. The anode of the fourth Zener diode D4 is connected to the base of the fifth transistor Q5 and the power supply voltage VCC through the voltage divider circuit. The emitter of the fifth transistor Q5 is connected to the power supply voltage VCC. The collector of the fifth transistor Q5 is connected to the nineteenth grounding resistor R19. The connection node between the collector of the fifth transistor Q5 and the nineteenth grounding resistor R19 is connected to the open-circuit detection terminal OC of the main control module. The voltage divider circuit includes a fourteenth resistor R14, a thirteenth resistor R13, and a twelfth resistor R12. The twelfth resistor R12 and the thirteenth resistor R13 are connected in parallel, and then connected in series with the fourteenth resistor R14. The first terminal of the voltage divider circuit is connected to the anode of the fourth Zener diode D4, and the second terminal is connected to the emitter of the fifth transistor Q5 and the power supply voltage. The first terminal of the twelfth resistor R12, connected to the first terminal of the thirteenth resistor R13, serves as the first terminal of the voltage divider circuit. The second terminal of the twelfth resistor R12, connected to the second terminal of the thirteenth resistor R13, is connected in series with the first terminal of the fourteenth resistor R14. The base of the fifth transistor Q5 is connected to the first terminal of the fourteenth resistor R14, the second terminal of the thirteenth resistor R13, and the second terminal of the twelfth resistor R12. The second terminal of the fourteenth resistor R14 serves as the second terminal of the voltage divider circuit.

[0022] Specifically, the fifth transistor Q5 is a PNP type transistor.

[0023] Preferably, in some embodiments, the main output circuit 12 includes a zero-crossing drive unit U2 and a driver-stage thyristor Q2. The main control module is connected to the control terminal of the driver-stage thyristor Q2 and the live wire of the AC power supply through the zero-crossing drive unit U2. The zero-crossing drive unit U2 is used to detect a zero-crossing signal when the drive signal of the main control module is valid, and output a trigger signal to the driver-stage thyristor Q2 in the AC voltage zero-crossing range of the AC power supply. The first connection terminal of the driver-stage thyristor Q2 is connected to the live wire of the AC power supply, and the second connection terminal of the driver-stage thyristor Q2 is connected to the load. The second connection terminal of the driver-stage thyristor Q2 serves as the second output terminal of the main output circuit. The zero-crossing drive unit U2 is a zero-crossing trigger optocoupler, and the positive electrode of the light source of the zero-crossing trigger optocoupler serves as the... The drive input terminal of the main output circuit is connected to the drive control terminal DRIVE of the main control module to receive the drive signal output by the main control module. The negative terminal of the light source of the zero-crossing trigger optocoupler is grounded. The first terminal of the light receiver of the zero-crossing trigger optocoupler serves as the first output terminal of the main output circuit. The first terminal of the light receiver of the zero-crossing trigger optocoupler is connected to the live wire of the AC power supply through the fifth resistor R5. A fuse F2 is connected in series between the fifth resistor R5 and the live wire of the AC power supply. The second terminal of the light receiver of the zero-crossing trigger optocoupler is connected to the control terminal of the drive-stage thyristor Q2. The drive-stage thyristor Q2 and the output-stage thyristors Q3 and Q4 are all bidirectional thyristors. The drive-stage thyristor Q2 is a three-quadrant thyristor to improve the withstand capability of reverse high voltage (dv / dt) and ensure the reliability of circuit disconnection. The output-stage thyristors Q3 and Q4 are general-purpose bidirectional thyristors to ensure full-wave drive without the need for a negative power supply, making the circuit simple and reliable. The driver-stage thyristor Q2 forms a dual-stage bidirectional thyristor system with the output-stage thyristors Q3 and Q4 corresponding to loads LOAD1 and LOAD2, respectively, to achieve isolation and multi-level electrical safety protection. For load LOAD1, when the driver-stage thyristor Q2 and the output-stage thyristor Q3 are simultaneously disconnected, load LOAD1 achieves physical-level electrical isolation and is completely de-energized, allowing operators to safely perform live maintenance without shutting off the main power supply. Furthermore, the dual-stage bidirectional thyristor system forms a two-stage drive architecture, increasing the overall transient blocking voltage capability to the sum of the withstand voltage values ​​of the two-stage bidirectional thyristors, enhancing the system's ability to withstand inductive reverse high voltage from the electromagnetic coil and improving its breakdown resistance under high-voltage environments. The dual-stage bidirectional thyristor system improves the reliability of troubleshooting faulty output points. Combined with the open-circuit detection circuit 16, it accurately checks output points that cannot be turned off, preventing damage to output points due to prolonged energization.By setting a zero-crossing drive unit U2 in the main output circuit 12, multiple outputs can be driven by a single zero-crossing drive. The zero-crossing signal does not enter the main control module. Only a single zero-crossing detection zero-crossing drive unit U2 is needed to realize the zero-crossing trigger control of multiple loads, thereby reducing the bill of materials cost.

[0024] Preferably, in some embodiments, the cathode of the fourth Zener diode D4 is connected to the second output terminal of the zero-crossing drive unit U2 and the control terminal of the drive stage thyristor Q2 through the sixth resistor R6.

[0025] For the load, such as LOAD1, the drive input terminal of the main output circuit 12 is connected to the drive control terminal DRIVE of the main control module. When the drive control terminal DRIVE of the main control module stops outputting the drive signal, the drive stage thyristor Q2 of the main output circuit 12 is naturally turned off. The main control module outputs a load control signal to one of the output stage thyristors Q3, causing the output stage thyristor Q3 to conduct. The base of the fifth transistor Q5 in the open-circuit detection circuit 16 is connected to the twelfth resistor R12 and the thirteenth resistor R13 in parallel through the voltage divider circuit, the fourth Zener diode D4, and the... When the corresponding load LOAD1, output stage thyristor Q3, and the first diode D1 and second diode D2 of the rectification and limiting unit of the overcurrent detection circuit 13 are grounded, and the fifth transistor Q5 is turned on, a circuit is formed when the connection status of the main output circuit 12 with the corresponding load LOAD1 and the connection status of the load LOAD1 with the main control module through the corresponding output stage thyristor Q3 are both normal. When the status monitoring signal output to the main control module is high, it is determined that there is an open circuit fault or poor contact fault in the corresponding connection status. When the DRIVE terminal of the main control module outputs a drive signal, the drive stage thyristor Q2 of the main output circuit 12 is turned on. The voltage at the connection point between the fourth Zener diode D4, the load LOAD1, and the second connection terminal of the drive stage thyristor Q2 exhibits a recurring alternating signal. When the connection between the main control module and the main output circuit 12 is normal, the main output circuit 12 operates normally. The frequency of this signal is the same as the AC power frequency. Therefore, by comparing the frequency of the current status monitoring signal with the AC power frequency, it can be determined whether the connection between the main control module and the main output circuit is normal. Eliminating the faulty output point ensures that the remaining output points can operate normally.

[0026] Reference Figure 3 , Figure 3 A flowchart illustrating the control method of the environmentally friendly pulse cleaning control system with self-diagnostic function of the present invention is shown. Applied to the above-mentioned environmentally friendly pulse cleaning control system with self-diagnostic function, the control method includes the following steps: S110: The main control module sequentially initiates output detection of each load according to a preset inspection cycle, so as to output a load control signal to the output stage thyristor of one of the loads to be detected; wherein, the preset inspection cycle refers to the time interval of the load output detection; S120: The main control module provides a drive signal to the main output circuit to drive the main output circuit to work; S130: The main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid; S141: When the overcurrent detection signal is a valid overcurrent detection signal, it is determined that the load has an overcurrent or short circuit fault. The main control module stops outputting the drive signal to the main output circuit and stops outputting the load control signal to the corresponding output stage thyristor to disconnect the corresponding load from the main output circuit and disconnect the corresponding output stage thyristor. The load is recorded as a fault output point, a fault alarm is generated and output, the current load output detection ends, and the next load is obtained as the load to be detected. S142: When the overcurrent detection signal is invalid, it is determined that the load is working normally, the output detection of the current load ends, and the next load is obtained as the load to be detected.

[0027] By eliminating faulty output points, the remaining output points can be ensured to function normally. The control method of this invention involves the main control module sequentially initiating output detection for each load according to a preset inspection cycle, outputting a load control signal to the output stage thyristor of one of the loads to be detected; the main control module provides a drive signal to the main output circuit to drive the main output circuit to operate and supply power to the load; the main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid; when the overcurrent detection signal is valid, it is determined that the load has an overcurrent or short-circuit fault, and the main control module stops outputting the drive signal to the main output circuit and stops outputting the load control signal to the corresponding output stage thyristor, thereby shutting off the corresponding load from the main output circuit. The system connects and disconnects the corresponding output stage thyristor, records the load as a fault output point, generates and outputs a fault alarm, ends the current load output detection, and obtains the next load as the load to be detected. This enables overcurrent detection of the operating current of each load, thereby detecting faults at the output points of the control system. The main control module can then promptly execute protection actions and generate fault alarms based on the detection results, effectively protecting devices connected to the fault output point and preventing device damage. Operators can also promptly handle fault output points to avoid damage to the entire machine. Fault troubleshooting can be performed point-by-point without relying on manual inspection, achieving automatic inspection and self-diagnosis. This reduces maintenance costs and improves inspection efficiency, preventing delayed fault detection.

[0028] Combination Figure 4 In one embodiment, before step S110, that is, before the main control module sequentially starts the output detection of each load according to the preset inspection cycle to output a load control signal to the output stage thyristor of one of the loads to be detected, step S101 may be included: the main control module stops outputting the drive signal to the main output circuit.

[0029] In this embodiment, before step S120, that is, before the main control module provides a drive signal to the main output circuit to drive the main output circuit to work, step S1101 may be included: the main control module collects the status monitoring signal output by the open circuit detection unit and determines whether the status monitoring signal is high level.

[0030] Specifically, by stopping the output drive signal to the main output circuit, the corresponding load's output stage thyristor is turned on to detect the connection status between the main output circuit and the load, and the connection status between the load and the main control module through the output stage thyristor. If both are connected normally and a path is formed, the status monitoring signal output to the main control module is high. When the status monitoring signal output to the main control module is low, it is determined that there is an open circuit fault or poor contact fault in the corresponding connection status.

[0031] Preferably, in this embodiment, after step S1101, that is, after the main control module collects the status monitoring signal output by the open-circuit detection unit and determines whether the status monitoring signal is high, the control method further includes: S1102: When the status monitoring signal is low, it is determined that there is an open circuit fault or poor contact fault in the connection between the load and the main output circuit, and / or that there is an open circuit fault or poor contact fault in the connection between the load and the main control module. The load is recorded as having a disconnected output point, a disconnection alarm is generated and output, the current load output detection ends, and the next load is obtained as the load to be detected.

[0032] When the status monitoring signal is high, it is determined that the connection status between the main output circuit and the load, and the connection status between the load and the main control module through the output stage thyristor, are both normal, and step S120 is executed, that is: When the status monitoring signal is high, the main control module provides a drive signal to the main output circuit to drive the main output circuit to work.

[0033] Preferably, in this embodiment, before step S130, that is, before the overcurrent detection signal output by the overcurrent detection circuit is collected in real time by the main control module and the validity of the overcurrent detection signal is determined, step S1201 may be included: the current status monitoring signal output by the open circuit detection unit is collected by the main control module and the frequency of the current status monitoring signal is determined to be consistent with the power frequency of the AC power supply.

[0034] When the main control module outputs a drive signal to the main output circuit, the voltage at the connection node between the load and the main output circuit exhibits a recurring alternating signal. When the connection between the main control module and the main output circuit is normal, the main output circuit operates normally. The frequency of this signal is the same as the power frequency of the AC power supply. By comparing the frequency of the status monitoring signal with the power frequency of the AC power supply, it can be determined whether the connection between the main control module and the main output circuit is normal.

[0035] Preferably, in this embodiment, after step S1201, that is, after the main control module collects the current status monitoring signal output by the open circuit detection unit and determines whether the frequency of the current status monitoring signal is consistent with the power frequency of the AC power supply, the control method further includes: S1202: When the frequency of the current status monitoring signal is inconsistent with the power frequency of the AC power supply, it is determined that there is a drive fault (i.e., there is an open circuit fault or poor contact fault in the connection between the main control module and the main output circuit), the load is recorded as having a disconnected output point, a disconnection alarm is generated and output, the output detection of the current load ends, and the next load is obtained as the load to be detected.

[0036] When the frequency of the current status monitoring signal is consistent with the power frequency of the AC power supply, it is determined that there is no open circuit fault or poor contact fault in the connection between the main control module and the main output circuit, the main output circuit is working normally, and step S130 is executed, that is: When the frequency of the current status monitoring signal is consistent with the power frequency of the AC power supply, the main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid.

[0037] By performing open-circuit testing before overcurrent detection, the integrity of the connection loop can be ensured, avoiding false positives due to incomplete connection loops, reducing the false positive rate, improving detection reliability, and expanding self-diagnostic functions. Furthermore, by using the open-circuit detection circuit to detect the connection status between the main output circuit and the corresponding load, the system can check for output points that cannot be turned off, preventing damage caused by prolonged power-on due to un-shutdown connections.

[0038] In summary, the environmentally friendly pulse cleaning control system with self-diagnostic function of the present invention has a main output circuit that connects the drive input terminal to the main control module and the first and second output terminals to the live wire of the AC power supply and the load, respectively, to supply power to the load. The main output circuit is connected to an overcurrent detection circuit through each load and the corresponding output stage thyristor. The overcurrent detection circuit collects the operating current of each load in real time and converts it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold, and an overcurrent detection signal is output to the main control module to realize overcurrent detection of the operating current of each load, thereby detecting faults at the output points of the control system. The main control module can then execute protection actions in a timely manner based on the detection results and generate a fault alarm, effectively protecting the devices connected to the faulty output point, shutting down the drive in time, realizing rapid protection of the output stage thyristor, preventing device damage, and allowing operators to handle faulty output points in a timely manner to avoid damage to the entire machine. Fault diagnosis can be carried out point by point without relying on manual inspection, realizing automatic inspection and self-diagnosis, with low operation and maintenance costs, and improving inspection efficiency and preventing delayed fault detection. Furthermore, the main control module is connected to the load via an output stage thyristor, allowing for individual control of the corresponding load's output. This facilitates troubleshooting of faulty output points and prevents them from affecting the normal operation of the dust removal equipment, resulting in high reliability. The control method of the environmental pulse cleaning control system with self-diagnostic function of this invention also possesses the above-mentioned functions.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An environmentally friendly pulse cleaning control system with self-diagnostic function, characterized in that, The system includes a main control module, a main output circuit, and an overcurrent detection circuit. The drive input terminal of the main output circuit is connected to the main control module. The first output terminal of the main output circuit is connected to the live wire of the AC power supply, and the second output terminal of the main output circuit is connected to the load. The main control module is connected to the load through an output stage thyristor. Each load corresponds to and is connected to an output stage thyristor. The main output circuit is connected to the overcurrent detection circuit through each load and the corresponding output stage thyristor. The signal output terminal of the overcurrent detection circuit is connected to the main control module. The overcurrent detection circuit is used to collect the operating current of the load in real time and convert it into a current sampling signal. The current sampling signal is compared with a preset overcurrent threshold to output an overcurrent detection signal to the main control module.

2. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 1, characterized in that, The overcurrent detection circuit includes a first transistor, a seventh transistor, a third Zener diode, a ninth resistor, and a sampling circuit. The base of the first transistor is connected to the sampling circuit and the second connection terminal of the output stage thyristor via the ninth resistor. The emitter of the first transistor is grounded. The collector of the first transistor is connected to the collector of the seventh transistor and then connected to a pull-up resistor via the third Zener diode. The connection node of the third Zener diode and the pull-up resistor is connected to the overcurrent detection terminal of the main control module. The emitter of the seventh transistor is connected to the base of the first transistor and the ninth resistor. The base of the seventh transistor is connected to an eighteenth grounding resistor. The sampling circuit is connected to the second connection terminal of the output stage thyristor. The first connection terminal of the output stage thyristor is connected to the corresponding load.

3. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 2, characterized in that, The sampling circuit includes a current sampling resistor and a rectification and limiting unit. The rectification and limiting unit is connected in parallel with the current sampling resistor so that the two ends of the rectification and limiting unit are respectively connected to the two ends of the current sampling resistor, which is used to perform bidirectional limiting and rectification on the current sampling resistor. The rectification and limiting unit includes a first diode and a second diode connected in reverse parallel. The first end of the current sampling resistor is connected to the second connection terminal of the output stage thyristor and the ninth resistor, and the second end of the current sampling resistor is grounded.

4. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 2, characterized in that, Both the first transistor and the seventh transistor are NPN transistors.

5. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 1, characterized in that, The control terminal of each output stage thyristor is connected to the corresponding coil drive terminal of the main control module through a corresponding connection resistor.

6. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 5, characterized in that, The environmentally friendly pulse cleaning control system with self-diagnostic function also includes an open circuit detection circuit. The input terminal of the open circuit detection circuit is electrically connected to the connection node between the main output circuit and the load. The output terminal of the open circuit detection circuit is connected to the main control module and is used to detect the connection loop status between the main output circuit and the load, and output a status monitoring signal to the main control module.

7. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 6, characterized in that, The open-circuit detection circuit includes a fifth transistor, a fourth Zener diode, and a voltage divider circuit. The cathode of the fourth Zener diode is connected to the second output terminal of the main output circuit and the first terminal of each load. The anode of the fourth Zener diode is connected to the base of the fifth transistor and the power supply voltage through the voltage divider circuit. The emitter of the fifth transistor is connected to the power supply voltage. The collector of the fifth transistor is connected to the nineteenth grounding resistor. The connection node between the collector of the fifth transistor and the nineteenth grounding resistor is connected to the open-circuit detection terminal of the main control module.

8. The environmentally friendly pulse cleaning control system with self-diagnostic function according to claim 1, characterized in that, The main output circuit includes a zero-crossing drive unit and a drive-stage thyristor. The main control module is connected to the control terminal of the drive-stage thyristor and the live wire of the AC power supply through the zero-crossing drive unit. The zero-crossing drive unit is used to detect the zero-crossing signal when the drive signal of the main control module is valid, and outputs a trigger signal to the drive-stage thyristor in the AC voltage zero-crossing range of the AC power supply. The first connection terminal of the drive-stage thyristor is connected to the live wire of the AC power supply, and the second connection terminal of the drive-stage thyristor is connected to the load. Both the drive-stage thyristor and the output-stage thyristor are bidirectional thyristors, and the drive-stage thyristor is a three-quadrant thyristor.

9. A control method for an environmentally friendly pulse cleaning control system with self-diagnostic function, characterized in that, The control method, applied to the environmentally friendly pulse cleaning control system with self-diagnostic function according to any one of claims 1 to 8, comprises the following steps: The main control module sequentially initiates output detection of each load according to a preset inspection cycle, so as to output a load control signal to the output stage thyristor of one of the loads to be detected. The main control module provides a drive signal to the main output circuit to drive the main output circuit to work. The main control module collects the overcurrent detection signal output by the overcurrent detection circuit in real time and determines whether the overcurrent detection signal is valid. When the overcurrent detection signal is valid, it is determined that the load has an overcurrent or short circuit fault. The main control module stops outputting drive signals to the main output circuit and stops outputting load control signals to the corresponding output stage thyristor to disconnect the corresponding load from the main output circuit and disconnect the corresponding output stage thyristor. The load is recorded as a fault output point, a fault alarm is generated and output, the current load output detection ends, and the next load is selected as the load to be detected. When the overcurrent detection signal is invalid, it is determined that the load is working normally, the output detection of the current load ends, and the next load is selected as the load to be detected.

10. A control method for an environmentally friendly pulse cleaning control system with self-diagnostic function, characterized in that, The control method, applied to the environmentally friendly pulse cleaning control system with self-diagnostic function as described in any one of claims 6 to 7, comprises the following steps: The main control module stops outputting drive signals to the main output circuit. The main control module sequentially initiates output detection of each load according to a preset inspection cycle, so as to output a load control signal to the output stage thyristor of one of the loads to be detected. The main control module collects the status monitoring signal output by the open circuit detection unit and determines whether the status monitoring signal is high. When the status monitoring signal is low, it is determined that there is an open circuit fault or poor contact fault in the connection between the load and the main output circuit, and / or that there is an open circuit fault or poor contact fault in the connection between the load and the main control module. The load is recorded as having a disconnected output point, a disconnection alarm is generated and output, the output detection of the current load ends, and the next load is obtained as the load to be detected. When the status monitoring signal is high, the main control module provides a drive signal to the main output circuit to drive the main output circuit to work. The main control module collects the current status monitoring signal output by the open circuit detection unit and determines whether the frequency of the current status monitoring signal is consistent with the power frequency of the AC power supply. When the frequency of the current status monitoring signal is inconsistent with the power frequency of the AC power supply, it is determined that there is a drive fault, the load is recorded as having a disconnection output point, a disconnection alarm is generated and output, the output detection of the current load ends, and the next load is obtained as the load to be detected. When the frequency of the current status monitoring signal is consistent with the power frequency of the AC power supply, the overcurrent detection signal output by the overcurrent detection circuit is collected in real time by the main control module to determine whether the overcurrent detection signal is valid. When the overcurrent detection signal is valid, it is determined that the load has an overcurrent or short circuit fault. The main control module stops outputting drive signals to the main output circuit and stops outputting load control signals to the corresponding output stage thyristor to disconnect the corresponding load from the main output circuit and disconnect the corresponding output stage thyristor. The load is recorded as a fault output point, a fault alarm is generated and output, the current load output detection ends, and the next load is selected as the load to be detected. When the overcurrent detection signal is invalid, it is determined that the load is working normally, the output detection of the current load ends, and the next load is selected as the load to be detected.

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