Metal strip static feeding controller and control system

Abstract

This invention provides a static feeding controller and control system for metal strips. The controller includes a switching power supply module, a microcontroller module, a drive module, and a bidirectional thyristor output module. The switching power supply module converts the line voltage between two phases of an external three-phase power supply to generate various DC voltages, providing power to the microcontroller module, etc. The microcontroller module stores a feeding delay time and generates a motor control signal based on the delay time, then sends the motor control signal to the drive module. The drive module isolates and amplifies the motor control signal to generate a bidirectional thyristor drive signal. The bidirectional thyristor output module controls the three-phase asynchronous motor to rotate forward, reverse, or stop based on the bidirectional thyristor drive signal. This invention significantly improves the lifespan of the metal strip feeding controller and reduces its power consumption.

Description

Technical Field

[0001] This invention relates to the field of electromechanical control technology, and in particular to a static feeding controller and control system for metal strips. Background Technology

[0002] When metal strip is stamped, the intermittent nature of the stamping process necessitates an intermittent feeding mechanism to the stamping equipment. Currently, the feeding controller uses a power frequency transformer to convert the 380V high voltage to 12V or 24V low voltage, obtaining DC voltage through a rectifier and filter circuit; the feeding interval is set via a time-delay relay; and the start and stop of the three-phase asynchronous motor for feeding is controlled by an AC contactor to achieve intermittent feeding. However, the contactor's lifespan is limited by the number of times its mechanical contacts open and close, and the power consumption of both the contactor and relay is significant. Furthermore, the power frequency transformer is bulky, resulting in a short lifespan, high power consumption, and large size for the feeding controller. Summary of the Invention

[0003] This invention provides a static feeding controller and control system for metal strips. It utilizes bidirectional thyristors to achieve intermittent feeding by the feeding motor. The controller has no mechanical moving parts inside, thus solving the problems of short lifespan, high power consumption, and large size of current feeding controllers. It provides a green, environmentally friendly, and cost-effective control solution.

[0004] In a first aspect, embodiments of the present invention provide a static feeding controller for metal strips, including a switching power supply module, a microcontroller module, a drive module, and a bidirectional thyristor output module;

[0005] The microcontroller module is connected to the switching power supply module and the drive module respectively; the switching power supply module is also used to connect to two phases of an external three-phase power supply; the drive module is also connected to the bidirectional thyristor output module; the bidirectional thyristor output module is also used to connect to an external three-phase power supply and a three-phase asynchronous motor respectively.

[0006] The switching power supply module is used to transform the line voltage between two phases of an external three-phase power supply to generate various DC voltages to power the microcontroller module.

[0007] The microcontroller module stores the feeding delay time, which is used to generate a motor control signal based on the feeding delay time in automatic mode, and then send the motor control signal to the drive module.

[0008] The drive module is used to isolate and amplify the motor control signal to generate the opto-thyristor drive signal;

[0009] The bidirectional thyristor output module is used to control the forward, reverse, or stop operation of a three-phase asynchronous motor based on the photoelectric thyristor drive signal.

[0010] In one possible implementation, the metal strip static feed controller further includes: an output interlock module and a drive interlock module;

[0011] The output interlock module is connected to the switching power supply module, the microcontroller module, and the drive module respectively, and the drive interlock module is connected to the drive module and the bidirectional thyristor output module respectively.

[0012] The switching power supply module is used to supply power to the output interlock module;

[0013] The output interlock module is used to perform the first layer of hardware interlock processing on the motor control signal output by the microcontroller module to prevent the logic output of the bidirectional thyristor output module from being mis-connected.

[0014] The drive interlock module is used to perform a second layer of hardware interlock processing on the opto-thyristor drive signal output by the drive module to prevent the bidirectional thyristor output module from being mis-energized by system interference.

[0015] The microcontroller module is also used to perform software interlocking on the generated motor control signals.

[0016] In one possible implementation, the output interlock module uses a tri-state buffer circuit to achieve the first level of hardware interlock processing.

[0017] The microcontroller module is specifically used for:

[0018] When the motor control signal is a forward rotation enable request signal, the reverse rotation enable is invalid, and after the protection delay time, a forward rotation enable request signal is output.

[0019] When the motor control signal is a reverse enable request signal, the forward enable is invalid, and after the protection delay time, a reverse enable request signal is output.

[0020] When the motor control signal is a stop request signal, both the forward and reverse enable signals are invalid, and a stop request signal is output.

[0021] In one possible implementation, the switching power supply module uses a single-input multiple-output flyback converter, taking the line voltage between two phases of an external three-phase power supply as the input voltage to generate multiple DC voltages.

[0022] In one possible implementation, the metal strip static feed controller also includes a strip grounding detection module;

[0023] The material grounding detection module is connected to the switching power supply module and the microcontroller module respectively;

[0024] The switching power supply module is used to power the material grounding detection module;

[0025] The strip grounding detection module is used to detect whether the metal strip is grounded based on the principle of opto-isolation and to generate grounding detection results;

[0026] The microcontroller module is also used to collect the grounding detection results of the material grounding detection module and generate motor control signals based on the grounding detection results and the feeding delay time.

[0027] In one possible implementation, the metal strip static feed controller also includes an input protection module and an output protection module;

[0028] The input protection module is used to connect to an external three-phase power supply. The input protection module is also connected to a bidirectional thyristor output module, and two phases of the input protection module are also connected to a switching power supply module. The output protection module is connected to the bidirectional thyristor output module.

[0029] The input protection module is used to provide overvoltage and overcurrent protection for the input of an external three-phase power supply.

[0030] The output protection module is used to provide overvoltage protection for the bidirectional thyristor output module and to suppress the rate of voltage rise.

[0031] In one possible implementation, the metal strip static feeder controller also includes a key processing module and a run indication module;

[0032] Both the button processing module and the operation indicator module are connected to the microcontroller module;

[0033] The button processing module is connected to the housing buttons of the metal strip static feeder controller. It is used to set the manual or automatic state, set the forward rotation control, reverse rotation control or stop control in the manual state, and set the feeding delay time, and feed the setting information back to the microcontroller module. Among them, the forward rotation jog button and the reverse rotation jog button in the housing button are used to control the forward and reverse rotation of the three-phase asynchronous motor in the manual state, and to set the feeding delay time in the automatic state.

[0034] The operation indicator module is connected to the operation indicator light on the housing of the metal strip static feed controller. It is used to obtain the power status, controller operation status, and feeding delay time setting status from the microcontroller module and display them in the corresponding areas.

[0035] In one possible implementation, the microcontroller module includes a main control chip, decoupling circuitry, and FLASH memory integrated within the main control chip.

[0036] The main control chip is connected to both the switching power supply module and the drive module; the decoupling circuit is connected to the power supply terminal of the main control chip.

[0037] The decoupling circuit is used to decouple the power supply of the main control chip;

[0038] The FLASH memory is used to store the feeding delay time.

[0039] In one possible implementation, the drive module uses a photoelectric thyristor driver chip to control the on / off operation of the bidirectional thyristor output module.

[0040] The bidirectional thyristor output module uses bidirectional thyristors to control the forward, reverse, or stop operation of a three-phase asynchronous motor under the control of the opto-thyristor drive signal.

[0041] Secondly, embodiments of the present invention provide a static feeding control system for metal strips, including the static feeding controller for metal strips as described in the first aspect or any possible implementation thereof.

[0042] This invention provides a static feeding controller and control system for metal strips. The static feeding controller for metal strips includes a switching power supply module, a microcontroller module, a drive module, and a bidirectional thyristor output module. The bidirectional thyristor output module enables forward, reverse, or stop control of a three-phase asynchronous motor. Since the switching of the bidirectional thyristor is not limited by the number of switching cycles, its lifespan is long, which can improve the lifespan of the static feeding controller for metal strips. In addition, the switching power supply module provides high efficiency, small device size, and avoids the use of contactors and relays, which can reduce the power consumption of the metal strip feeding controller, reduce metal material consumption, and avoid mechanical switching noise. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a static metal strip feeding controller provided in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of a static metal strip feeding controller provided in another embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the structure of an output interlock module provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the drive interlock module and output protection module provided in an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of a software interlock process provided in an embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of a switching power supply module provided in an embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the structure of a material grounding detection module provided in an embodiment of the present invention. Detailed Implementation

[0051] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0053] See Figure 1 The diagram shows the structure of a static feed controller for metal strips. The static feed controller for metal strips includes a switching power supply module 11, a microcontroller module 12, a drive module 13, and a bidirectional thyristor output module 14.

[0054] The microcontroller module 12 is connected to the switching power supply module 11 and the drive module 13 respectively; the switching power supply module 11 is also used to connect to two phases of an external three-phase power supply; the drive module 13 is also connected to the bidirectional thyristor output module 14; the bidirectional thyristor output module 14 is also used to connect to an external three-phase power supply and a three-phase asynchronous motor respectively.

[0055] The switching power supply module 11 is used to transform the line voltage between two phases of an external three-phase power supply to generate various DC voltages to power the microcontroller module 12.

[0056] The microcontroller module 12 stores a feeding delay time, which is used to generate a motor control signal based on the feeding delay time in automatic mode, and send the motor control signal to the drive module 13.

[0057] The drive module 13 is used to isolate and amplify the motor control signal to generate the photoelectric thyristor drive signal;

[0058] The bidirectional thyristor output module 14 is used to control the three-phase asynchronous motor to rotate forward, reverse, or stop according to the photoelectric thyristor drive signal.

[0059] In one possible implementation, the switching power supply module 11 can perform a flyback conversion on the line voltage (380V) between phases B and C of the external three-phase power supply to obtain three DC voltages: 24V, 5V, and 3.3V. The DC voltage output by the switching power supply module 11 can power the microcontroller module 12, as well as subsequent components such as the material grounding detection module 17 and the output interlock module 15, providing the power required by each module.

[0060] The feeding delay time stored in the microcontroller module 12 can be used to represent the feeding interval time, that is, the timing starts from the moment the material is grounded, and feeding is performed again every feeding delay time. In automatic mode, the microcontroller module 12 can generate a motor control signal based on the feeding delay time, and generate a motor control signal every feeding delay time to control the three-phase asynchronous motor to work for feeding.

[0061] The metal strip static feeding controller provided in this embodiment includes a switching power supply module 11, a microcontroller module 12, a drive module 13, and a bidirectional thyristor output module 14. The bidirectional thyristor output module 14 realizes the forward, reverse, or stop control of the three-phase asynchronous motor. Since the switching of the bidirectional thyristor is not limited by the number of switching cycles, its lifespan is long, which can improve the lifespan of the metal strip static feeding controller. In addition, the power supply module 11 provides high efficiency, small device size, and avoids the use of power frequency transformers, which can reduce the power consumption and metal material consumption of the metal strip feeding controller.

[0062] In some embodiments, the drive module 13 uses a photoelectric thyristor drive chip to control the on / off drive of the bidirectional thyristor output module 14.

[0063] The bidirectional thyristor output module 14 uses a bidirectional thyristor. Under the control of the photoelectric thyristor drive signal, the bidirectional thyristor enables the three-phase asynchronous motor to rotate forward, reverse, or stop.

[0064] In this embodiment, the driving module 13 can use a photoelectric thyristor driver chip such as MOC3081 to isolate and amplify the signal output by the microcontroller module 12, thereby driving the bidirectional thyristor. A 0.1uF capacitor is connected to the main control terminal of the MOC3081 to prevent the thyristor from being falsely triggered due to interference.

[0065] The bidirectional thyristor output module 14 can use bidirectional thyristors such as BTA10-800 to realize the forward rotation, reverse rotation or stop of the asynchronous motor under the control of the photoelectric thyristor drive signal.

[0066] A bidirectional thyristor is an ideal AC switching device made of five layers of NPNPN semiconductor material and has a single control electrode.

[0067] In some embodiments, see Figure 2 The metal strip static feeding controller also includes: output interlock module 15 and drive interlock module 16;

[0068] The output interlock module 15 is connected to the switching power supply module 11, the microcontroller module 12 and the drive module 13 respectively, and the drive interlock module 16 is connected to the drive module 13 and the bidirectional thyristor output module 14 respectively.

[0069] Switching power supply module 11 is used to supply power to output interlock module 15;

[0070] The output interlock module 15 is used to perform the first hardware interlock processing on the motor control signal output by the microcontroller module 12 to prevent the logic output of the bidirectional thyristor output module 14 from being mis-connected.

[0071] The drive interlock module 16 is used to perform a second hardware interlock process on the photoelectric thyristor drive signal output by the drive module 13 to prevent the bidirectional thyristor output module 14 from being mis-connected due to system interference.

[0072] The microcontroller module 12 is also used to perform software interlocking processing on the generated motor control signals.

[0073] In some embodiments, the output interlock module 15 may employ a tri-state buffer circuit to implement the first level of hardware interlock processing;

[0074] Microcontroller module 12 is specifically used for:

[0075] When the motor control signal is a forward rotation enable request signal, the reverse rotation enable is invalid, and after the protection delay time, a forward rotation enable request signal is output.

[0076] When the motor control signal is a reverse enable request signal, the forward enable is invalid, and after the protection delay time, a reverse enable request signal is output.

[0077] When the motor control signal is a stop request signal, both the forward and reverse enable signals are invalid, and a stop request signal is output.

[0078] This embodiment adopts a triple interlock design, namely a first hardware interlock, a second hardware interlock, and a software interlock.

[0079] The output interlock module 15 employs a tri-state buffer circuit, specifically a tri-state buffer chip 74HCT125, connected to the main control chip in the microcontroller module 12. This provides the first layer of hardware interlocking for the motor control signals output by the microcontroller module 12, preventing misleading turn-on of the bidirectional thyristor logic output. The first layer of hardware interlocking primarily interlocks the forward and reverse control signals, preventing simultaneous output of both signals.

[0080] The circuit structure of the three-state buffer circuit is as follows: Figure 3 As shown. See also Figure 3 The tri-state buffer circuit includes a first input terminal B-1-EN, a second input terminal B-2-EN, a first resistor R1, a first capacitor C1, a second resistor R2, a second capacitor C2, a first tri-state buffer chip U1D, a second tri-state buffer chip U1B, a forward control signal output terminal (forward rotation), and a reverse control signal output terminal (reverse rotation). For the connection relationships of each component, please refer to [reference needed]. Figure 3 The details will not be elaborated further. The first input terminal B-1-EN and the second input terminal B-2-EN are both connected to the microcontroller module 12. The forward rotation control signal output terminal can be connected to the forward rotation signal input terminal of the drive signal, and the reverse rotation control signal output terminal can be connected to the reverse rotation signal input terminal of the drive module 13.

[0081] When the motor control signal output by the microcontroller module 12 is a forward rotation enable request signal, the signal input at the first input terminal B-1-EN is valid, the signal input at the second input terminal B-2-EN is invalid, and the first tri-state buffer chip U1D outputs a forward rotation control signal, while the second tri-state buffer chip U1B is disabled and no reverse rotation control signal is output. When the motor control signal output by the microcontroller module 12 is a reverse rotation enable request signal, the signal input at the second input terminal B-2-EN is valid, the signal input at the first input terminal B-1-EN is invalid, and the second tri-state buffer chip U1B outputs a reverse rotation control signal, while the first tri-state buffer chip U1D is disabled and no forward rotation control signal is output.

[0082] The drive interlock module 16 can perform a second layer of hardware interlocking on the photoelectric thyristor drive signal output by the drive module 13 to prevent the bidirectional thyristor output module 14 from being mistakenly turned on due to disturbance signals, which could burn out the bidirectional thyristor. Specifically, the drive interlock module 16 can interlock the forward / reverse control signal through the input terminal of the photoelectric thyristor drive chip MOC3081.

[0083] The circuit structure diagram of the drive interlock module 16 is as follows: Figure 4 The interlock module for the drive is shown. See also... Figure 4The drive interlock module 16 includes a third input terminal (forward rotation), a fourth input terminal (reverse rotation), a third resistor R5, a third capacitor C5, a fourth resistor R6, a fourth capacitor C6, a first opto-thyristor driver U5, and a second opto-thyristor driver U6. The connection relationships of each component are detailed below. Figure 4 The details will not be elaborated further. The third and fourth input terminals can be connected to the drive module 13, and the first photoelectric thyristor driver U5 and the second photoelectric thyristor driver U6 can be connected to the bidirectional thyristor output module 14.

[0084] When the photoelectric thyristor drive signal is a forward drive signal, the signal input to the third input terminal is valid, the signal input to the fourth input terminal is invalid, and the first photoelectric thyristor driver U5 outputs a forward drive signal, while the second photoelectric thyristor driver U6 does not output a reverse drive signal. When the photoelectric thyristor drive signal is a reverse drive signal, the signal input to the third input terminal is invalid, the signal input to the fourth input terminal is valid, and the first photoelectric thyristor driver U5 does not output a forward drive signal, while the second photoelectric thyristor driver U6 outputs a reverse drive signal.

[0085] The first opto-thyristor driver U5 and the second opto-thyristor driver U6 can both be MOC3081.

[0086] in, Figure 3 and Figure 4 In the above, GND indicates that the DC power supply is connected to ground.

[0087] The microcontroller module 12 can implement software interlocking. The software interlocking utilizes the main control chip to implement the software mutual exclusion design of the motor control signals, thereby realizing the interlocking of the motor forward / reverse and start / stop control signals.

[0088] The flowchart for the implementation of software interlocks can be found here. Figure 5 The details will not be elaborated further. Among them, the forward rotation enable request is the forward rotation enable request signal, the stop request is the stop request signal, the reverse rotation enable request is the reverse rotation enable request signal, and the dead time is the protection delay time. The protection delay time can be set according to actual needs and is not specifically limited here.

[0089] In this embodiment, the motor control signal can also be understood as a bidirectional thyristor control signal, since the three-phase asynchronous motor is controlled by controlling the bidirectional thyristor. This embodiment employs a three-layer interlock design for the bidirectional thyristor control signal: two layers of hardware interlock and one layer of software interlock. The hardware interlock includes control signal input interlock and output interlock. The control signal input interlock uses a 74HCT125 to interlock the thyristor forward / reverse control signals output by the main control chip; the control signal output interlock uses the input terminal of the opto-thyristor driver chip MOC3081 to interlock the thyristor forward / reverse control signals; the software interlock uses the main control chip to implement a software mutual exclusion design for the thyristor control signals, achieving interlocking of the thyristor forward / reverse and start / stop control signals.

[0090] In some embodiments, the switching power supply module 11 employs a single-input multiple-output flyback converter, using the line voltage between two phases of an external three-phase power supply as the input voltage to generate various DC voltages.

[0091] The switching power supply module 11 can use a power control chip, such as UC3844, to realize a single-input multi-output single-ended flyback converter power supply. It uses the AC 380VAC between phases B and C as the input voltage to generate the +5V, +3.3V and +24V DC power supplies required by the feed controller. The input circuit and output circuit of the switching power supply module 11 are isolated by using isolation transformers.

[0092] This embodiment uses a high-frequency switching power supply, which is highly efficient and has a small device size.

[0093] The structure of the switching power supply module 11 is as follows: Figure 6 As shown. See also Figure 6 The switching power supply module 11 may include a single-ended flyback circuit 111, a first filter circuit 112, a second filter circuit 113, and a step-down circuit 114.

[0094] The input terminal of the single-ended flyback circuit 111 is connected to phases B and C of an external three-phase power supply or to phases B and C of the input protection module 18. The first output terminal of the single-ended flyback circuit 111 is connected to the input terminal of the first filter circuit 112, and the second output terminal of the single-ended flyback circuit 111 is connected to the input terminal of the second filter circuit 113. The output terminal of the second filter circuit 113 is connected to the input terminal of the buck circuit 114. The first filter circuit 112 outputs a first DC voltage, the second filter circuit 113 outputs a second DC voltage, and the buck circuit 114 outputs a third DC voltage. The first DC voltage can be 24V, the second DC voltage can be 5V, and the third DC voltage can be 3.3V.

[0095] In some embodiments, see Figure 2 The metal strip static feeding controller also includes a strip grounding detection module 17;

[0096] The material grounding detection module 17 is connected to the switching power supply module 11 and the microcontroller module 12 respectively;

[0097] Switching power supply module 11 is used to power the material grounding detection module 17;

[0098] The strip grounding detection module 17 is used to detect whether the metal strip is grounded based on the principle of opto-isolation and generate grounding detection results;

[0099] The microcontroller module 12 is also used to collect the grounding detection results of the material grounding detection module 17, and generate motor control signals based on the grounding detection results and the feeding delay time.

[0100] The material grounding detection module 17 can be connected to an external grounding detection line to detect whether the metal strip is grounded and when it leaves the ground, thereby controlling the start and stop of the feeding asynchronous motor.

[0101] The strip grounding detection module 17 adopts an opto-isolation design and uses an optocoupler chip, such as NEC2051, to detect whether the metal strip is grounded by checking whether the primary side is conductive. The opto-isolation technology has good reliability and high safety, and can filter out strip jitter noise.

[0102] The structure of the material grounding detection module 17 is as follows: Figure 7 As shown. See also Figure 7 The material grounding detection module 17 may include a first optocoupler U10, a fifth resistor R10, a sixth resistor R11, and a fifth capacitor C10. The connection relationships of each component are detailed below. Figure 7 This will not be elaborated upon further. Among them, Figure 7 CON1 is the interface used to connect the metal strip grounding detection metal device. The fifth resistor R10 is used for primary-side current limiting of the optocoupler. The sixth resistor R11 and the fifth capacitor C10 form an RC filter to filter out strip jitter. The 24V and VCC-3.3V voltages can be powered by the switching power supply module 11. GND represents the DC power ground, which is connected to the metal casing of the feeding equipment as a common loop for the grounding signal at the detection point.

[0103] In some embodiments, see Figure 2 The metal strip static feeding controller also includes an input protection module 18 and an output protection module 19;

[0104] The input protection module 18 is used to connect to an external three-phase power supply. The input protection module 18 is also connected to the bidirectional thyristor output module 14. Two phases of the input protection module 18 are also connected to the switching power supply module 11. The output protection module 19 is connected to the bidirectional thyristor output module 14.

[0105] Input protection module 18 is used to provide overvoltage and overcurrent protection for the output of external three-phase power supply;

[0106] The output protection module 19 is used to provide overvoltage protection for the bidirectional thyristor output module 14 and to suppress switching overvoltage and voltage rise rate.

[0107] The input protection module 18 may include input overvoltage protection and transient suppression circuits as well as input overcurrent protection circuits. The input protection module 18 can be connected to the three-phase AC 380VAC power frequency input provided by an external three-phase power supply to protect the AC input of the feed controller.

[0108] In some possible implementations, the input protection module 18 may include a fuse and a varistor to provide overvoltage and overcurrent protection for the AC input.

[0109] The circuit diagram of output protection module 19 is as follows: Figure 4 The output protection module is shown. See also... Figure 4 The output protection module 19 is connected to the bidirectional thyristors (T5 and T15) in the bidirectional thyristor output module 14 and is used to protect the bidirectional thyristors to prevent excessively high output voltage and excessively large voltage change rate (dV / dt).

[0110] The output protection module 19 may include a trigger protection RC circuit, an RC series circuit, and an overvoltage protection circuit. The trigger protection RC circuit includes a seventh resistor R6, an eighth resistor R7, a sixth capacitor C6, a ninth resistor R16, a tenth resistor R17, and a seventh capacitor C16 to achieve trigger current limiting and suppress trigger noise. The RC series circuit includes an eleventh resistor R8, an eighth capacitor C7, a twelfth resistor R18, and a ninth capacitor C17 to suppress the thyristor output voltage rise rate and prevent excessively high voltage change rate dV / dt from causing thyristor mis-conduction. The resistance values ​​of the eleventh resistor R8 and the twelfth resistor R18 can be 24-100Ω, and the capacitance values ​​of the eighth capacitor C7 and the ninth capacitor C17 can be 10-100nF. The overvoltage protection circuit includes a first varistor R9 and a second varistor R19 to achieve overvoltage protection for the thyristor output and prevent excessively high voltage from causing thyristor breakdown. The breakdown voltage of the first varistor R9 and the second varistor R19 can be 680V. The connection relationships of the components in output protection module 19 can be found in [reference]. Figure 4 I will not elaborate further. Figure 4 In the middle, F5 and F15 can be fuses.

[0111] In some embodiments, see Figure 2 The metal strip static feeding controller also includes a key processing module 20 and a running indicator module 21;

[0112] Both the button processing module 20 and the operation indicator module 21 are connected to the microcontroller module 12;

[0113] The button processing module 20 is connected to the housing buttons of the metal strip static feeder controller. It is used to set the manual or automatic state, i.e., manual / automatic state switching, to set the forward rotation control, reverse rotation control or stop control in the manual state, and to set the feeding delay time, and to feed the setting information back to the microcontroller module 12. Among them, the forward rotation jog button and the reverse rotation jog button in the housing buttons are used to control the forward and reverse rotation of the three-phase asynchronous motor in the manual state, and to set the feeding delay time in the automatic state.

[0114] The operation indicator module 21 is connected to the operation indicator light on the housing of the metal strip static feed controller. It is used to obtain the power status, controller operation status and feeding delay time setting status from the microcontroller module 12 and display them in the corresponding area.

[0115] The housing buttons of the metal strip static feeder controller may include a manual / automatic switching self-locking button, a forward jog button, and a reverse jog button. When the manual / automatic switching self-locking button is not pressed, the controller is in manual mode. Pressing the forward jog button drives the three-phase motor to rotate forward; releasing the button stops the motor. In manual mode, pressing the reverse jog button drives the three-phase asynchronous motor to rotate in reverse; releasing it stops the motor. When the manual / automatic switching self-locking button is pressed, the feeder controller is in automatic mode, automatically implementing intermittent feeding of the metal strip according to its status. In automatic mode, the software control program sets the forward and reverse jog buttons as feeding delay time setting buttons; that is, the forward and reverse jog buttons can be reused through software programming. At this time, pressing and holding the forward jog button will increase the feeding delay time by 1 second, and pressing and holding the reverse jog button will decrease the feeding delay time by 1 second. This feeding delay time will be stored in the FLASH memory to ensure that the signal set after power failure can be saved for a long time.

[0116] The button processing module 20 can send the setting information of each button to the microcontroller module 12. The microcontroller module 12 can generate corresponding motor control signals or feeding delay signals according to the setting information to control the three-phase asynchronous motor.

[0117] The power status indicator shows whether the feeding controller is connected to power. When connected, the power indicator light is on. The controller's operating status includes automatic and manual modes. In automatic mode, both the power indicator and the automatic status indicator light are on. In manual mode, the power indicator light is on, and the automatic status indicator light is off. In automatic mode, pressing and holding the forward jog button will delay the feeding delay by 1 second until the automatic status indicator light goes off. Releasing the forward jog button will turn the automatic status indicator light on again. Pressing and holding the forward jog button again will increase the feeding delay time again. Similarly, pressing and holding the reverse jog button in automatic mode will decrease the feeding delay by 1 second until the automatic status indicator light goes off. Releasing the reverse jog button will turn the automatic status indicator light on again. Pressing and holding the reverse jog button again will decrease the feeding delay time again. In automatic mode, pressing and holding the forward and reverse jog buttons does not affect the controller's automatic operation.

[0118] In some embodiments, the microcontroller module 12 includes a main control chip, a decoupling circuit, and a FLASH memory integrated within the main control chip.

[0119] The main control chip is connected to the switching power supply module 11 and the drive module 13 respectively; the decoupling circuit is connected to the power supply terminal of the main control chip.

[0120] The decoupling circuit is used to decouple the power supply of the main control chip;

[0121] The FLASH memory is used to store the feeding delay time.

[0122] The decoupling circuit is connected to the power supply of the main control chip to decouple the power supply of the main control chip, thereby reducing the noise coupled from the power supply to the main control chip and reducing the impact of the main control chip's operation on other components.

[0123] The microcontroller module 12 may also include a clock circuit and a running indicator circuit.

[0124] The clock circuit can be connected to the main control chip to provide the operating clock for the main control chip.

[0125] The operation indicator circuit is connected to the main control chip and the operation indicator module 21 respectively.

[0126] The microcontroller module 12 may also include I / O circuits, reset circuits, and SWD circuits.

[0127] The FLASH memory can be located inside the main control chip to store the feeding delay time, preventing data loss in the event of power failure. Specifically, the spare flash space within the main control chip can be used to store the feeding delay time. This allows for online modification of the feeding delay time and ensures data retention even after power loss, while also avoiding the need for E-type errors. 2 PROM circuits are used to simplify the circuitry and reduce hardware costs.

[0128] The main control chip can be an ARM chip such as STM32F103, which can realize the acquisition of material grounding status, the timing of material feeding delay time, and the control and protection of bidirectional thyristors.

[0129] This application utilizes switching power supply technology and flyback power supply control technology to provide +24V, +5V, and +3.3V DC power when the line voltage is 380V. It employs a triple interlocking method to prevent the bidirectional thyristor from mis-conducting and burning out the system, and uses the bidirectional thyristor for commutation of the three-phase AC output to achieve forward and reverse motor rotation. A microprocessor and internal Flash memory are used to indicate the system's operating status and set the feeding interval. Opto-isolation technology is used for feeding status detection. The ARM chip STM32F103 is used as the main control chip, and a tri-state buffer is employed. The 74HCT125 is an output interlock chip, and the BTA10-800 bidirectional thyristor is a power output chip to control the asynchronous motor for static automatic feeding of metal strips. The device is fully enclosed in a plastic housing, ensuring safety and reliability. Combined with strip grounding detection, manual / automatic state switching buttons, forward / reverse jog buttons, automatic feeding interval setting, system operation protection, and triple thyristor output protection, it achieves low-cost, high-efficiency, high-safety, high-reliability, and long-life intermittent feeding control of metal strips.

[0130] The embodiments of this application adopt digital control technology, which allows for flexible control changes and easy integration with intelligent control, facilitating equipment upgrades and replacements. The small size and enclosed structure improve the safety and reliability of the equipment, and can solve the problems of large size, high cost, and difficulty in upgrading and replacing existing feeding controllers.

[0131] Corresponding to the above-mentioned static feeding controller for metal strips, this embodiment of the invention also provides a static feeding control system for metal strips, including any of the above-mentioned static feeding controllers for metal strips, and having the beneficial effects of any of the above-mentioned static feeding controllers for metal strips.

[0132] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application.

[0133] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0134] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0135] In the embodiments provided by this invention, it should be understood that the disclosed static metal strip feeding controller and device can be implemented in other ways. For example, the embodiments of the static metal strip feeding controller described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0136] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0137] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0138] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A metal strip static feed controller characterized by, The switching power module, the microcontroller module, the driving module and the bidirectional thyristor output module are included. The microcontroller module is connected with the switching power module and the driving module respectively; the switching power module is also used for connecting with two phases of the external three-phase power supply; the driving module is also connected with the bidirectional thyristor output module; the bidirectional thyristor output module is also used for connecting with the external three-phase power supply and the three-phase asynchronous motor respectively. The switching power module adopts a single-input multi-output flyback converter, which is used for converting the line voltage between two phases of the external three-phase power supply to generate various DC voltages for powering the microcontroller module; the switching power module includes a single-ended flyback circuit, a first filter circuit, a second filter circuit and a step-down circuit; the input end of the single-ended flyback circuit is connected with the B and C phases of the external three-phase power supply or the input protection module; the first output end of the single-ended flyback circuit is connected with the input end of the first filter circuit; the second output end of the single-ended flyback circuit is connected with the input end of the second filter circuit; the output end of the second filter circuit is connected with the input end of the step-down circuit; the first filter circuit outputs a first DC voltage; the second filter circuit outputs a second DC voltage; and the step-down circuit outputs a third DC voltage. The microcontroller module stores a feeding delay time, which is used for generating a motor control signal according to the feeding delay time in the automatic state and sending the motor control signal to the driving module; The driving module is used for isolating and amplifying the motor control signal to generate a silicon controlled photocell driving signal; The bidirectional thyristor output module is used for controlling the three-phase asynchronous motor to rotate forward, reverse or stop according to the silicon controlled photocell driving signal; The driving module adopts a silicon controlled photocell driving chip to control the on-off driving of the bidirectional thyristor output module; The bidirectional thyristor output module adopts a bidirectional thyristor to realize the forward rotation, reverse rotation or stop of the three-phase asynchronous motor under the control of the silicon controlled photocell driving signal; the bidirectional thyristor realizes the commutation of three-phase alternating current output to realize the forward and reverse rotation of the motor; the driving module adopts a silicon controlled photocell driving chip MOC3081, and the bidirectional thyristor output module adopts a BTA10-800 bidirectional thyristor. Further comprising: an output interlocking module and a drive interlocking module; the output interlocking module is connected with the switching power supply module, the microcontroller module and the drive module respectively, and the drive interlocking module is connected with the drive module and the bidirectional thyristor output module respectively; the switching power supply module is used for powering the output interlocking module; the output interlocking module is used for performing first heavy hardware interlocking processing on the motor control signal output by the microcontroller module, so as to prevent the bidirectional thyristor output module from being logically output misdirected on; the drive interlocking module is used for performing second heavy hardware interlocking processing on the triode for alternating current drive signal output by the drive module, so as to prevent the bidirectional thyristor output module from being system interference misdirected on; the microcontroller module is further used for performing software interlocking processing on the generated motor control signal; the hardware interlocking includes control signal input interlocking and output interlocking, and the software interlocking adopts a main control chip to realize software interlocking design of the thyristor control signal; The output interlocking module adopts a three-state buffer circuit to realize the first heavy hardware interlocking processing; the drive interlocking module includes a third input end, a fourth input end, a third resistor, a third capacitor, a fourth resistor, a fourth capacitor, a first triode for alternating current driver and a second triode for alternating current driver; the third input end and the fourth input end are connected with the drive module, and the first triode for alternating current driver and the second triode for alternating current driver are connected with the bidirectional thyristor output module; Further comprising a strip grounding detection module; the strip grounding detection module is connected with the microcontroller module; the strip grounding detection module is used for detecting whether the metal strip is grounded by using photoelectric isolation technology, and generating a grounding detection result; the microcontroller module is further used for collecting the grounding detection result of the strip grounding detection module, and generating a motor control signal according to the grounding detection result and the feeding delay time; Further comprising an output protection module; the output protection module is connected with the bidirectional thyristor output module; the output protection module is used for overvoltage protection and voltage rise rate suppression of the bidirectional thyristor output module.

2. The metal strip static feed controller of claim 1, wherein, The microcontroller module is specifically used for: When the motor control signal is a forward rotation enable request signal, controlling the reverse rotation enable to be invalid, and outputting the forward rotation enable request signal after a protection delay time; When the motor control signal is a reverse rotation enable request signal, controlling the forward rotation enable to be invalid, and outputting the reverse rotation enable request signal after the protection delay time; When the motor control signal is a stop request signal, controlling the forward rotation enable and the reverse rotation enable to be invalid, and outputting the stop request signal.

3. The metal strip static feed controller of any of claims 1-2, wherein, The strip grounding detection module is connected with the switching power supply module; The switching power supply module is used for powering the strip grounding detection module.

4. The metal strip static feed controller of any one of claims 1 to 2, wherein, Further comprising an input protection module; The input protection module is used for being connected with the external three-phase power supply, and is further connected with the bidirectional thyristor output module; two phases of the input protection module are further connected with the switching power supply module; The input protection module is used for overvoltage protection and overcurrent protection of the input of the external three-phase power supply.

5. The metal strip static feed controller of any of claims 1-2, wherein, Further comprising a key processing module and a running indication module; The key processing module and the running indication module are connected with the microcontroller module; The key processing module is connected with the shell key of the metal strip static feeding controller, used for setting the manual state or the automatic state, setting the forward rotation control, the reverse rotation control or the stop control in the manual state, setting the feeding delay time, and feeding back the setting information to the microcontroller module; wherein the forward rotation jog key and the reverse rotation jog key in the shell key are used for controlling the forward rotation and the reverse rotation of the three-phase asynchronous motor in the manual state, and setting the feeding delay time in the automatic state; The running indication module is connected with the shell running indication lamp of the metal strip static feeding controller, used for obtaining the power supply state, the controller running state and the setting state of the feeding delay time from the microcontroller module, and displaying in the corresponding area.

6. The metal strip static feed controller of any one of claims 1 to 2, wherein, The microcontroller module comprises a main control chip, a decoupling circuit and a FLASH memory integrated in the main control chip; The main control chip is connected with the switching power supply module and the driving module respectively; the decoupling circuit is connected with the power supply end of the main control chip; The decoupling circuit is used for decoupling processing of the power supply end of the main control chip; The FLASH memory is used for storing the feeding delay time.

7. A metal strip static feed control system characterized by, The metal strip static feeding controller comprises the metal strip static feeding controller according to any one of claims 1 to 6.

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