New welding machine

Abstract

The invention relates to a novel welding machine, which is used for driving a wire feeding motor of a welding machine. It discloses that the 2nd foot of a chip U30 of a motor control circuit 1 is connected to the middle tap of a variable resistor VR1 to obtain a given signal, and then the 9th and 10th feet of the chip U30 output circuit driving signals to drive the motor to work through a MOS tube Q14 in a motor driving circuit 2, and the drain of the MOS tube Q14 is coupled from the 4th foot to the 1st foot of the chip U30 through a photoelectric coupler U15. After processing by the chip U30, the voltage value of the output circuit driving signal of the 9th and 10th feet of the control chip U30 is the same as the voltage value of the given signal; the source of the MOS tube Q14 in the motor driving circuit 2 inputs a current feedback signal to the 2nd foot of the chip U30 of the motor control circuit 1, so as to protect the motor from working normally. The invention has the advantages of simple and neat circuit wiring, stable operation of the wire feeding motor, strong circuit anti-interference ability, and easy maintenance.

Description

Technical Field

[0001] The invention relates to a novel welding machine, in particular to a welding machine circuit with simplified wiring and a stable wire feeding motor. Background Art

[0002] The display board and the control board are directly connected through multiple signals or optically isolated. There are too many connecting wires. If one of the wires has poor contact, the whole machine will not work. At the same time, because there is only one single-chip microcomputer to handle it, there are too many connections between the single-chip microcomputer and the display board, which is easy to cause external interference. In addition, the wire feeding motor was controlled by thyristor before, resulting in unsatisfactory control of the wire feeding speed, which sometimes speeds up and slows down, affecting the wire feeding stability of the machine. Summary of the invention

[0003] The purpose of the present invention is to provide a new welding machine circuit, which adopts PWM control mode to control the wire feeding motor, improves the stability of wire feeding, and allows the main and auxiliary machine single chip microcomputer circuits to communicate through the main and auxiliary 485 circuit communication mode, greatly increases the anti-interference performance and reduces the number of data connections.

[0004] The technical solution of the present invention is based on a motor control circuit 1, a motor drive circuit 2, a slave 485 circuit 3, a host 485 circuit 4, a host single-chip circuit 5, and a slave single-chip circuit 6. The feature is that the 2nd foot of the motor control circuit 1 chip U30 is connected to the middle tap of the variable resistor VR1, and a given signal is provided to the chip U30. After the chip U30 processes the given signal, the 9th foot and the 10th foot of the chip U30 output the circuit drive signal to the gate of the MOS tube Q14 in the motor drive circuit 2, so that the MOS tube Q14 is turned on to make the motor work, and the MOS tube Q14 is turned on to make the motor work. The drain of 4 is connected to the 2nd foot of the photoelectric coupler U15 of the motor control circuit 1, and the voltage feedback signal is input from the 4th foot to the 1st foot of the chip U30 through the coupling of the photoelectric coupler U15. After the chip U30 compares the voltage feedback signal with the given signal, the voltage value of the circuit driving signal output from the 9th foot and the 10th foot of the control chip U30 is the same as the voltage value of the given signal input to the 2nd foot of the chip U30; the source of the MOS tube Q14 of the motor drive circuit (2) is connected to the 2nd foot of the motor control circuit 1 chip U30, and the current feedback signal is input to the chip U30 to protect the normal operation of the motor.

[0005] The transceiver signal output end of the host single-chip microcomputer circuit 5 described above transmits the transceiver signal to the transceiver signal input end of the host 485 circuit 4, and then the communication output end of the host single-chip microcomputer circuit 5 transmits the signal through the host 485 circuit 4 and the slave 485 circuit 3 to the communication input end of the slave single-chip microcomputer circuit 6 in sequence; the transceiver signal output end of the slave single-chip microcomputer circuit 6 transmits the transceiver signal to the transceiver signal input end of the slave 485 circuit 3, and then the communication output end of the slave single-chip microcomputer circuit 6 transmits the signal through the slave 485 circuit 3 and the host 485 circuit 4 in sequence to the communication input end of the host single-chip microcomputer circuit 5; the motor start and stop signal output end of the host single-chip microcomputer circuit 5 is connected to pin 1 of the photoelectric coupler U20 of the motor control circuit 1, and after coupling through the photoelectric coupler U20, the motor start and stop signal is input to pin 4 of the motor control circuit 1 chip U30.

[0006] The host single-chip computer circuit 5 of the present invention sends and receives control signals at the transceiver signal output end to the 2nd and 3rd pins of the host 485 circuit 4 chip U44, switches the chip U44 to the sending state, and then the host single-chip computer circuit 5 outputs a communication signal to the 3rd pin of the chip U43, controls the output communication signal of the 6th pin of U43 to the 4th pin of U44 by controlling the 3rd pin of U43, and then obtains the corresponding change signal of the 6th and 7th pins of U44 after processing by U44 and outputs it to the 6th and 7th pins of U3 of the slave 485 circuit 3, and then the 1st pin of U3 outputs the communication signal to the base machine of Q1, and after amplification, it is given to the 2nd pin of U1, and then the communication signal is transmitted to the communication input end of the slave single-chip computer circuit 6 at the 6th pin of U1; the slave single After receiving the communication signal, the microcontroller circuit 6 transmits the sending and receiving control signals from the transceiver signal output terminal to the pins and 3 of the slave 485 circuit 3 chip U3, so that U3 switches to the sending state, and then the slave microcontroller circuit 6 outputs the communication signal to the 3rd pin of U2, and controls the output communication signal of the 6th pin of U2 to the 4th pin of U3 by controlling the 3rd pin of U2, and then obtains the corresponding change signal of the 6th and 7th pins of U3 after processing by U3, and outputs it to the 6th and 7th pins of U44 of the host 485 circuit 3, and then the 1st pin of U44 outputs the communication signal to the base of the transistor Q100, and after amplification, it is given to the 2nd pin of U141, and then the communication signal is transmitted to the communication input terminal of the host microcontroller circuit 5 at the 6th pin of U141.

[0007] The working principle of the present invention is to first adjust the voltage given to the motor control circuit, that is, the voltage at pin 2 of U30, through the motor voltage setting part by adjusting VR1. This voltage is the motor voltage setting. After receiving the given signal, the motor control circuit will output the motor drive signal through pins 9 and 10 of U30 to the motor drive circuit, and give pins 9 and 10 of U30 to the gate of Q14 to drive Q14 to turn on, so that the motor can be turned on. At the same time, the voltages at both ends of the motor, that is, the two signals +28.28 and DJ-, are given to the motor voltage feedback circuit, and are returned to the negative pole DJ of the motor through +28.28 through R106 to the optocoupler light-emitting end of U15. -, through the voltage difference at both ends, the light receiving end of the optocoupler U15 changes, and enters the 1st pin of the motor control circuit U30, and the motor voltage feedback and the motor voltage setting are compared through the motor control circuit, so that the motor output is the same voltage as the motor setting, thereby controlling the speed of the motor, and through the voltage of R130 to the ground in the motor drive circuit when the motor is turned on, that is, the motor current feedback signal FLQ, the FLQ signal is sent back to the 16th pin of the motor control circuit U30, which plays a role in protecting the motor and the motor drive circuit, and preventing the motor from being stuck due to external conditions, resulting in excessive current damaging Q14 and the motor in the motor drive circuit.

[0008] The invention has the advantages of simple and neat circuit wiring, stable operation of the wire feeding motor, strong circuit anti-interference ability and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a circuit schematic diagram of a motor control circuit 1 of the present invention;

[0010] Figure 2 It is a circuit schematic diagram of the motor drive circuit 2 of the present invention;

[0011] Figure 3 It is the circuit principle diagram of the auxiliary machine 485 circuit 3 of the present invention;

[0012] Figure 4 It is the circuit principle diagram of the host 485 circuit 4 of the present invention;

[0013] Figure 5 It is a circuit principle block diagram of the present invention. DETAILED DESCRIPTION

[0014] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the chip U30 model is TL494, the photoelectric coupler U20 model is TP521, the photoelectric coupler U15 model is 4N25, the MOS tube Q14 model is IRF260N, the chips U1, U2, U141, U43 model is 6N137, the chips U3, U44 model is SN75LBC184, the transistors Q1, Q100 model is 9012, the motor MOTO is the wire feeding motor of the welding machine, the present invention is based on the motor control circuit 1, the motor drive circuit 2, the auxiliary machine 485 circuit 3, the host 485 circuit 4, the host single-chip circuit 5, and the auxiliary machine single-chip circuit 6, and the feature is that the 2nd foot of the motor control circuit 1 chip U30 is connected to the middle tap of the variable resistor VR1 to provide a given signal to the chip U30, and the chip U3 After processing the given signal, the 9th and 10th pins of the chip U30 output the circuit driving signal to the gate of the MOS tube Q14 in the motor driving circuit 2, so that the MOS tube Q14 is turned on to make the motor work. The drain of the MOS tube Q14 is connected to the 2nd pin of the photoelectric coupler U15 of the motor control circuit 1. The voltage feedback signal is input from the 4th pin to the 1st pin of the chip U30 through the coupling of the photoelectric coupler U15. After the chip U30 compares the voltage feedback signal with the given signal, the voltage value of the circuit driving signal output from the 9th and 10th pins of the control chip U30 is the same as the voltage value of the given signal input to the 2nd pin of the chip U30. The source of the MOS tube Q14 in the motor driving circuit (2) is connected to the 2nd pin of the motor control circuit 1 chip U30, and the current feedback signal is input to the chip U30 to protect the normal operation of the motor.

[0015] The transceiver signal output end of the host single-chip microcomputer circuit 5 described above transmits the transceiver signal to the transceiver signal input end of the host 485 circuit 4, and then the communication output end of the host single-chip microcomputer circuit 5 transmits the signal through the host 485 circuit 4 and the slave 485 circuit 3 to the communication input end of the slave single-chip microcomputer circuit 6 in sequence; the transceiver signal output end of the slave single-chip microcomputer circuit 6 transmits the transceiver signal to the transceiver signal input end of the slave 485 circuit 3, and then the communication output end of the slave single-chip microcomputer circuit 6 transmits the signal through the slave 485 circuit 3 and the host 485 circuit 4 in sequence to the communication input end of the host single-chip microcomputer circuit 5; the motor start and stop signal output end of the host single-chip microcomputer circuit 5 is connected to pin 1 of the photoelectric coupler U20 of the motor control circuit 1, and after coupling through the photoelectric coupler U20, the motor start and stop signal is input to pin 4 of the motor control circuit 1 chip U30.

[0016] The host single-chip microcomputer circuit 5 of the present invention sends and receives control signals at the transceiver signal output end to the 2nd and 3rd pins of the host 485 circuit 4 chip U44, switches the chip U44 to the sending state, and then the host single-chip microcomputer circuit 5 outputs a communication signal to the 3rd pin of the chip U43, controls the output communication signal of the 6th pin of U43 to the 4th pin of U44 by controlling the 3rd pin of U43, and then obtains the corresponding change signal of the 6th and 7th pins of U44 after processing by U44 and outputs it to the 6th and 7th pins of U3 of the slave 485 circuit 3, and then the 1st pin of U3 outputs the communication signal to the base machine of Q1, and gives it to the 2nd pin of U1 after amplification, and then transmits the communication signal to the communication input end of the slave single-chip microcomputer circuit 6 at the 6th pin of U1; the slave single-chip microcomputer circuit 6 of the slave After receiving the communication signal, the machine circuit 6 transmits the sending and receiving control signals from the transceiver signal output end to the 32nd and 3rd pins of the slave 485 circuit 3 chip U3, so that U3 switches to the sending state, and then the slave single-chip computer circuit 6 outputs the communication signal to the 3rd pin of U2, and controls the output communication signal of the 6th pin of U2 to the 4th pin of U3 by controlling the 3rd pin of U2, and then obtains the corresponding change signal of the 6th and 7th pins of U3 after processing by U3, and outputs it to the 6th and 7th pins of U44 of the host 485 circuit 3, and then the 1st pin of U44 outputs the communication signal to the base machine of the transistor Q100, and after amplification, it is given to the 2nd pin of U141, and then the communication signal is transmitted to the communication input end of the host single-chip computer circuit 5 at the 6th pin of U141.

Claims

1. A novel welding machine, comprising a motor control circuit (1), a motor drive circuit (2), a secondary machine 485 circuit (3), a main machine 485 circuit (4), a main machine single chip circuit (5), and a secondary machine single chip circuit (6), wherein the novel welding machine comprises: Pin 2 of the motor control circuit (1) chip U30 is connected to the middle tap of the variable resistor VR1, providing a given signal to the chip U30. After the chip U30 processes the given signal, the 9th and 10th pins of the chip U30 output circuit drive signals to the gate of the MOS tube Q14 in the motor drive circuit (2), so that the MOS tube Q14 is turned on to allow the motor to work. The drain of the MOS tube Q14 is connected to the 2nd pin of the motor control circuit (1) photoelectric coupler U15, and a voltage feedback signal is input from the 4th pin to the 1st pin of the chip U30 through the photoelectric coupler U15 coupling. After the chip U30 compares the voltage feedback signal with the given signal, the voltage value of the circuit drive signal output from the 9th and 10th pins of the control chip U30 is the same as the voltage value of the given signal input to the 2nd pin of the chip U30. The source of the MOS tube Q14 in the motor drive circuit (2) is connected to the 2nd pin of the motor control circuit (1) chip U30, and a current feedback signal is input to the chip U30 to protect the normal operation of the motor.

2. The new welding machine according to claim 1 is characterized in that the main machine The transceiver signal output end of the single-chip microcomputer circuit (5) transmits a transceiver signal to the transceiver signal input end of the host 485 circuit (4), and then the communication output end of the host single-chip microcomputer circuit (5) transmits a signal that passes through the host 485 circuit (4) and the auxiliary machine 485 circuit (3) in sequence to the communication input end of the auxiliary machine single-chip microcomputer circuit (6); the transceiver signal output end of the auxiliary machine single-chip microcomputer circuit (6) transmits a transceiver signal to the transceiver signal input end of the auxiliary machine 485 circuit (3), and then the communication output end of the auxiliary machine single-chip microcomputer circuit (6) transmits a signal that passes through the auxiliary machine 485 circuit (3) and the host 485 circuit (4) in sequence to the communication input end of the host single-chip microcomputer circuit (5); the motor start / stop signal output end of the host single-chip microcomputer circuit (5) is connected to the 1st pin of the photoelectric coupler U20 of the motor control circuit (1), and after coupling through the photoelectric coupler U20, the motor start / stop signal is input to the 4th pin of the chip U30 of the motor control circuit (1).

3. The new welding machine according to claim 2 is characterized in that the main machine The single-chip microcomputer circuit (5) sends and receives control signals at the transceiver signal output end to the pins 2 and 3 of the chip U44 of the host 485 circuit (4), switches the chip U44 to the sending state, and then the host single-chip microcomputer circuit (5) outputs a communication signal to the pin 3 of the chip U43, controls the output communication signal of the pin 6 of U43 to the pin 4 of U44 by controlling the pin 3 of U43, and then obtains the corresponding change signal of the pin 6 and pin 7 of U44 after processing by U44 and outputs it to the pin 6 and pin 7 of U3 of the slave 485 circuit (3), and then the pin 1 of U3 outputs this communication signal to the base machine of Q1, and after amplification, it is given to the pin 2 of U1, and then the communication signal is transmitted to the communication input end of the slave single-chip microcomputer circuit (6) at the pin 6 of U1; After receiving the communication signal, the slave single-chip computer circuit (6) transmits the sending and receiving control signals from the transceiver signal output terminal to the 3rd and 4th pins of the slave 485 circuit (3) chip U3, so that U3 switches to the sending state. Then the slave single-chip computer circuit (6) outputs the communication signal to the 3rd pin of U2, and controls the output communication signal of the 6th pin of U2 to the 4th pin of U3 by controlling the 3rd pin of U2. Then, after being processed by U3, the corresponding change signals of the 6th and 7th pins of U3 are obtained, and output to the 6th and 7th pins of U44 of the host 485 circuit (3). Then, the 1st pin of U44 outputs the communication signal to the base of the transistor Q100, and after being amplified, it is given to the 2nd pin of U141. Then, the communication signal is transmitted to the communication input terminal of the host single-chip computer circuit (5) at the 6th pin of U141.

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