Motor drive circuit and argon welding bead interval automatic liquid feeding cleaning machine

Abstract

The utility model relates to the technical field of power electronics, and discloses a motor drive circuit, comprising an isolation module used for realizing isolation between a control module and a power supply module; the power module is used for controlling the working state and the output voltage of the power module, and the voltage is used for controlling the rotating speed of the motor; when the switching circuit is in the second switching state, the power module outputs the voltage to the motor through the switching circuit. According to the utility model, the switching circuit is arranged, and when the switching circuit is controlled to be in the first switching state, internal devices of the power supply module are charged; and when the switching circuit is in the second switching state, the power module outputs voltage to the motor through the switching circuit, so that the power module supplies power to the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a motor drive circuit and an automatic liquid-feeding cleaning machine for argon welding welds. Background Art

[0002] Traditional argon welding weld cleaning technology generally involves manual grinding and scrubbing or electrolytic cleaning using a high-power transformer. Another method is pickling. Manual grinding and scrubbing is inefficient, noisy, and cannot guarantee quality. Electrolytic cleaning using a high-power transformer is inconvenient for workers to carry because the machine is large and must be fixed at a fixed work location. Pickling is even more dangerous. Pickling liquid is a corrosive material that not only corrodes stainless steel but also human skin. Pickling work can easily cause burns to workers, and the washed stainless steel will rust. Stainless steel weld cleaning is a very common job. How to improve cleaning efficiency and quality more effectively and safely is a practical problem that cannot be solved by manual grinding and cleaning, pickling, and electrolytic cleaning using a high-power transformer. In order to save labor costs and ensure safety and cleaning quality, finding a cleaning technology that can replace traditional manual cleaning technology and fixed-site high-power transformer electrolytic device cleaning technology will be a revolutionary breakthrough in the field of stainless steel weld cleaning. Utility Model Content

[0003] In view of this, the utility model provides a motor drive circuit and an argon welding weld interval automatic liquid feeding cleaning machine to solve the problem of how to achieve automatic cleaning of argon welding welds.

[0004] In the first aspect, the utility model provides a motor drive circuit, including: a control module, an isolation module, a power supply module and a switching circuit, wherein the isolation module, a first end of which inputs a first power supply voltage, a second end of which is connected to the first end of the control module, a third end of which inputs the first power supply voltage, and a fourth end of which is grounded, is used to achieve isolation between the control module and the power supply module; the power supply module, a power supply end of which inputs a second power supply voltage, a first end of which is connected to the fifth end of the isolation module, a second end, a third end of which is connected to the first end, a second end, and a third end of the switching circuit, a fifth end of which is connected to the second end of the control module, a sixth end and a seventh end of which are grounded, is used to control the working state of the power supply module and the output voltage of the power supply module, and the voltage is used to control the motor speed; the switching circuit, a third end of which is connected to the motor, a fourth end of which inputs a third power supply voltage, and a fifth end of which is grounded; when the switching circuit is in the first switching state, the internal components of the power supply module are charged; when the switching circuit is in the second switching state, the power supply module outputs voltage to the motor through the switching circuit.

[0005] The utility model sets a switch circuit and controls the switch circuit to be in a first switch state so that the internal components of the power module are charged; when the switch circuit is in a second switch state, the power module outputs voltage to the motor through the switch circuit, so that the power module supplies power to the motor.

[0006] In some specific embodiments, the isolation module includes: an optocoupler isolation chip, a first resistor and a second resistor, wherein the optocoupler isolation chip has a first end at which a first power supply voltage is input through the first resistor, a second end at which the first end of the control module is connected, a third end at which the first power supply voltage is input, a fourth end at which the first end is grounded, and a fifth end at which the first end of the power supply module is connected.

[0007] In some specific embodiments, the power supply module includes: a power supply chip, a bootstrap diode, a bootstrap capacitor and a grounding capacitor, wherein the power supply chip has an input end connected to the fifth end of the isolation module, a power supply end connected to the anode of the bootstrap diode, a first power supply end also grounded through a grounding capacitor, a control end connected to the second end of the control module, a grounding end grounded, a second power supply end connected to the cathode of the bootstrap diode, a first output end connected to the first end of the switching circuit, a second output end connected to the cathode of the bootstrap diode through the bootstrap capacitor, a second output end also connected to the third end of the switching circuit, and a third output end connected to the second end of the switching circuit.

[0008] In some specific implementations, the power chip is a bootstrap suspension drive power chip.

[0009] In some specific embodiments, the switching circuit includes: a first switching circuit, a second switching circuit, a filtering circuit and a supporting circuit, wherein the first switching circuit has a first end connected to the second end of the power module, a second end connected to the second end of the power module and the first end of the second switching circuit respectively, a third end inputting a third power supply voltage, and a third end connected to ground through the filtering circuit and the supporting circuit respectively; the second switching circuit has a first end connected to the motor, a second end connected to the third end of the power module, and a third end connected to ground.

[0010] In some specific embodiments, the first switching circuit includes: a first diode, a first driving resistor, and a first MOS transistor, wherein the first MOS transistor has a drain inputting a third power supply voltage, a drain being grounded through a filtering circuit and a supporting circuit respectively, a source being connected to the second end of the power module and the first end of the second switching circuit, a gate being connected to the anode of the first diode, and a gate being connected to the second end of the power module through the first driving resistor; and a cathode of the first diode being connected to the second end of the power module.

[0011] In some specific embodiments, the second switching circuit includes: a second diode, a second driving resistor, and a second MOS tube, wherein the second MOS tube has a drain connected to the second end of the first switching circuit, a drain connected to the motor, a source connected to ground, a gate connected to the anode of the second diode, and a gate connected to the third end of the power module through the second driving resistor; the second diode has a cathode connected to the second end of the power module.

[0012] In some specific implementations, the filter circuit includes: a filter capacitor.

[0013] In some specific implementations, the support circuit includes: a support capacitor.

[0014] In a second aspect, the utility model provides an automatic liquid feeding and cleaning machine for argon welding welds, comprising: a motor drive circuit and a motor of an optional implementation method of the first aspect and any of its embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a composition diagram of a motor drive circuit according to an embodiment of the utility model;

[0017] Figure 2 It is a circuit structure diagram of a motor drive circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0019] In this embodiment, a motor driving circuit is provided. Figure 1 As shown, it includes: a control module 1, an isolation module 2, a power module 3 and a switch circuit 4.

[0020] like Figure 1As shown, the isolation module 2 has a first end that inputs the first power supply voltage, a second end that is connected to the first end of the control module 1, a third end that inputs the first power supply voltage, and a fourth end that is grounded, and is used to achieve isolation between the control module 1 and the power supply module 3.

[0021] Specifically, the control module 1 is mainly composed of a control chip, which has a built-in argon welding weld cleaning program, such as: timed welding weld cleaning, etc. Therefore, the control module 1 is weak electricity, and the rotation of the motor can deliver liquid, and the motor is strong electricity. Therefore, in order to achieve isolation between strong electricity and weak electricity, an isolation module 2 is set.

[0022] like Figure 1 As shown, the power supply module 3 has a power supply end inputting a second power supply voltage, a first end thereof is connected to the fifth end of the isolation module 2, a second end, a third end thereof and a fourth end thereof are connected to the first end, the second end and the third end thereof of the switch circuit 4, a fifth end thereof is connected to the second end of the control module 1, and a sixth end and a seventh end thereof are grounded.

[0023] like Figure 1 As shown, the switch circuit 4 has a third terminal connected to the motor 5, a fourth terminal inputting a third power supply voltage, and a fifth terminal grounded.

[0024] Specifically, the control module 1 sends a PWM signal to the power module 3 through the isolation module 2. The PWM signal is used to control the working state of the power module 3 and the output voltage of the power module 3. The voltage is used to control the motor speed. At the same time, the control module 1 can directly control the start and stop of the power module 3, thereby realizing the start and stop of liquid delivery.

[0025] Specifically, when the switch circuit 4 is in the first switch state, the internal components of the power module 3 are charged; when the switch circuit 4 is in the second switch state, the power module 3 outputs voltage to the motor through the switch circuit 4.

[0026] In a specific embodiment, Figure 2 As shown, the isolation module 2 includes: an optocoupler isolation chip U2, a first resistor R04 and a second resistor R03, wherein the optocoupler isolation chip U2, a first end of which inputs a first power supply voltage (i.e., VCC5V) through the first resistor R04, a second end of which is connected to the first end of the control module 1, a third end of which inputs the first power supply voltage, a fourth end of which is grounded, and a fifth end of which is connected to the first end of the power supply module 3.

[0027] In a specific embodiment, Figure 2As shown, the power supply module 3 includes: a power supply chip U01, a bootstrap diode D05, a bootstrap capacitor C02 and a grounding capacitor C01, wherein the power supply chip U01 has an input end connected to the fifth end of the isolation module 2, a power supply end connected to the anode of the bootstrap diode D05, a first power supply end also grounded through the grounding capacitor C01, a control end connected to the second end of the control module 1, a grounding end grounded, a second power supply end connected to the cathode of the bootstrap diode D05, a first output end connected to the first end of the switch circuit 4, a second output end connected to the cathode of the bootstrap diode D05 through the bootstrap capacitor C02, a second output end also connected to the third end of the switch circuit 4, and a third output end connected to the second end of the switch circuit 4.

[0028] In a specific implementation, the power chip U01 is a bootstrap suspension drive power chip.

[0029] In a specific implementation, the switch circuit 4 includes: a first switch circuit, a second switch circuit, a filter circuit and a support circuit.

[0030] The first switch circuit has a first end connected to the second end of the power module 3, a second end connected to the second end of the power module 3 and the first end of the second switch circuit respectively, a third power supply voltage is input to the third end, and the third end is also grounded through the filter circuit and the support circuit respectively; the second switch circuit has a first end connected to the motor, a second end connected to the third end of the power module 3, and a third end grounded.

[0031] Specifically, Figure 2 When the first switch circuit is turned on and the second switch circuit is turned off, the bootstrap capacitor C02 is charged. When the first switch circuit is turned off and the second switch circuit is turned on, the bootstrap capacitor C02 is equivalent to a voltage source and the bootstrap capacitor C02 is discharged to the switch circuit 4.

[0032] In a specific embodiment, Figure 2 As shown, the first switch circuit includes: a first diode D06, a first driving resistor R01, and a first MOS transistor Q01, wherein the first MOS transistor Q01 has a drain inputting a third power supply voltage, a drain being grounded through a filtering circuit and a supporting circuit respectively, a source being connected to the second end of the power module 3 and the first end of the second switch circuit, a gate being connected to the anode of the first diode D06, and a gate being connected to the second end of the power module 3 through the first driving resistor R01; and a cathode of the first diode D06 being connected to the second end of the power module 3.

[0033] In a specific embodiment, Figure 2As shown, the second switch circuit includes: a second diode D07, a second drive resistor R02, and a second MOS tube Q02, wherein the second MOS tube Q02 has a drain connected to the second end of the first switch circuit, a drain connected to the motor, a source connected to the ground, a gate connected to the anode of the second diode D07, and a gate connected to the third end of the power module 3 through the second drive resistor R02; the second diode D07 has a cathode connected to the second end of the power module 3.

[0034] In a specific embodiment, Figure 2 As shown, the filter circuit includes: a filter capacitor C03.

[0035] In a specific implementation, the support circuit includes: a support capacitor E01.

[0036] This embodiment provides an automatic liquid-feeding cleaning machine for argon welding welds, comprising: a motor drive circuit and a motor of the above embodiment and any optional implementation manner thereof, wherein the rotation of the motor can move the cleaning liquid to clean the argon welding welds.

[0037] For example, Figure 2 The automatic liquid feeding motor drive is a half-bridge drive composed of two NMOS tubes, using domestic MOS tubes with SD shutdown drive PWM and IGBT dedicated driver chips; internally integrated logic signal input processing circuit, dead zone control circuit, level shift circuit, pulse filtering circuit and output drive circuit.

[0038] Figure 2 In the circuit, C03 and E01 are motor power filter and support capacitors, Q01 and Q02 form a half-bridge motor drive circuit, and the motor speed is adjusted by PWM pulse width modulation; R01 and R02 are MOS tube drive resistors, and the MOS is quickly turned off by D06 and D07 acceleration diodes; Since EG2104 adopts a bootstrap floating drive power supply design, a VCC15V power supply can complete the drive of the high-end MOS tube (Q01) and the low-end MOS (Q02) two power tubes; the external bootstrap diode D05 and the self Bootstrap capacitor C02, when the lower tube (Q02) is turned on and the upper tube (Q01) is turned off, the bootstrap capacitor C02 is charged to VCC15V. When the upper tube (Q01) is turned on and the lower tube (Q02) is turned off, the voltage on the bootstrap capacitor C02 is equivalent to a voltage source, which can reliably drive the upper tube (Q01) to turn on; MOTO_PWM is connected to the IO port of the microcontroller, and the motor speed is adjusted by giving a PWM signal through the U2 optocoupler gate driver; MOTO_SD is connected to the IO port of the microcontroller, and can control the opening and closing of PWM;

[0039] The single-chip microcomputer software adjusts the logic of pulsating automatic liquid delivery: a fixed frequency and adjustable pulse width PWM square wave signal is generated through the PCA module inside the single-chip microcomputer and connected to the MOTO_PWM input terminal, and any IO port of the single-chip microcomputer is connected to the MOTO_SD input terminal. When MOTO_SD is at a high level, the single-chip microcomputer software adjusts the PWM pulse duty cycle and the motor speed to achieve automatic liquid delivery. When pulsating liquid delivery is required, the high and low level time of MOTO_SD is controlled by the single-chip microcomputer software timer. The high level delivers liquid, and the low level turns off the liquid delivery. The liquid delivery speed is controlled by adjusting the PWM square wave duty cycle to achieve pulsating automatic liquid delivery.

[0040] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A motor drive circuit, characterized in that: include: Control module, isolation module, power module and switch circuit, wherein: an isolation module, a first end of which inputs a first power supply voltage, a second end of which is connected to the first end of the control module, a third end of which inputs the first power supply voltage, and a fourth end of which is grounded, and is used to achieve isolation between the control module and the power supply module; A power supply module, whose power supply end inputs a second power supply voltage, whose first end is connected to the fifth end of the isolation module, whose second end, third end and fourth end are connected to the first end, second end and third end of the switch circuit, whose fifth end is connected to the second end of the control module, whose sixth end and seventh end are grounded, and which is used to control the working state of the power supply module and the output voltage of the power supply module, and the voltage is used to control the motor speed; A switch circuit, a third terminal of which is connected to the motor, a fourth terminal of which is input with a third power supply voltage, and a fifth terminal of which is grounded; When the switch circuit is in a first switch state, the internal components of the power module are charged; when the switch circuit is in a second switch state, the power module outputs voltage to the motor through the switch circuit.

2. The motor drive circuit according to claim 1, characterized in that: The isolation module includes: an optical coupling isolation chip, a first resistor and a second resistor, wherein: An optocoupler isolation chip, wherein the first end thereof inputs the first power supply voltage through the first resistor, the second end thereof is connected to the first end of the control module, the third end thereof inputs the first power supply voltage, the fourth end thereof is grounded, and the fifth end thereof is connected to the first end of the power supply module.

3. The motor drive circuit according to claim 1, characterized in that: The power module includes: a power chip, a bootstrap diode, a bootstrap capacitor and a grounding capacitor, wherein: A power supply chip, wherein the input end thereof is connected to the fifth end of the isolation module, the power supply end thereof is connected to the anode of the bootstrap diode, the first power supply end thereof is also grounded through the grounding capacitor, the control end thereof is connected to the second end of the control module, the grounding end thereof is grounded, the second power supply end thereof is connected to the cathode of the bootstrap diode, the first output end thereof is connected to the first end of the switch circuit, the second output end thereof is connected to the cathode of the bootstrap diode through the bootstrap capacitor, the second output end thereof is also connected to the third end of the switch circuit, and the third output end thereof is connected to the second end of the switch circuit.

4. The motor drive circuit according to claim 3, characterized in that: The power chip is a bootstrap suspension drive power chip.

5. The motor drive circuit according to claim 1, characterized in that: The switch circuit includes: a first switch circuit, a second switch circuit, a filter circuit and a support circuit, wherein: A first switch circuit, a first end of which is connected to the second end of the power module, a second end of which is respectively connected to the second end of the power module and the first end of the second switch circuit, a third end of which inputs the third power supply voltage, and a third end of which is also grounded through the filter circuit and the support circuit respectively; A second switch circuit has a first end connected to the motor, a second end connected to the third end of the power module, and a third end grounded.

6. The motor drive circuit according to claim 5, characterized in that: The first switch circuit includes: a first diode, a first driving resistor, and a first MOS tube, wherein: A first MOS transistor, a drain of which inputs a third power supply voltage, a drain of which is grounded through the filtering circuit and the supporting circuit respectively, a source of which is connected to the second end of the power module and the first end of the second switch circuit, a gate of which is connected to the anode of the first diode, and a gate of which is also connected to the second end of the power module through the first driving resistor; A first diode has a cathode connected to the second end of the power module.

7. The motor drive circuit according to claim 5, characterized in that: The second switch circuit includes: a second diode, a second driving resistor, and a second MOS tube, wherein: a second MOS transistor, whose drain is connected to the second end of the first switch circuit, whose drain is connected to the motor, whose source is grounded, whose gate is connected to the anode of the second diode, and whose gate is also connected to the third end of the power module through the second drive resistor; A cathode of the second diode is connected to the second end of the power module.

8. The motor drive circuit according to claim 5, characterized in that: The filter circuit includes: a filter capacitor.

9. The motor drive circuit according to claim 5, characterized in that: The supporting circuit includes: a supporting capacitor.

10. An automatic liquid feeding and cleaning machine for argon welding welds, characterized in that: include: The motor drive circuit and the motor according to any one of claims 1 to 9.

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