CN210412978U - High-stability high-current arc welding power supply based on inverter technology - Google Patents
High-stability high-current arc welding power supply based on inverter technology Download PDFInfo
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- CN210412978U CN210412978U CN201921264776.9U CN201921264776U CN210412978U CN 210412978 U CN210412978 U CN 210412978U CN 201921264776 U CN201921264776 U CN 201921264776U CN 210412978 U CN210412978 U CN 210412978U
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Abstract
A high-stability high-current arc welding power supply based on an inverter technology comprises: the circuit comprises a main circuit, a pulse width modulation control circuit, a driving circuit, an auxiliary switching power supply, a box body and a protection device, wherein the main circuit comprises a rectifying filter circuit, an inverter circuit, a transformer and an output rectifying filter circuit; the pulse width modulation control circuit comprises a PWM modulation circuit; the driving circuit comprises an optical coupling chip 316J; the auxiliary switch power supply comprises a TOPSWITCH-II device which is used for supplying power to the pulse width modulation control circuit, the drive circuit and the active device in the main circuit; box and protection device include quick-witted case and protection device, protection device includes excessive pressure overcurrent protection, short-circuit protection and ground protection, the utility model discloses output current 0-30A can be stabilized, maximum output current 40A has energy-efficient, the quality is light, small, control performance is good, dynamic response is fast and easily realize real time control's advantage.
Description
The technical field is as follows:
the utility model relates to an arc-welding power supply technical field, in particular to high stability heavy current arc-welding power supply based on contravariant technique.
Background art:
the arc, which is generated by the strong and persistent discharge between the two electrodes, is a phenomenon of air conduction. An arc (or arc discharge) is a form of gas self-sustaining discharge. Arc discharge is characterized by high current density accompanied by high temperatures (up to thousands to tens of thousands of K) and intense light. The phenomenon of intense and permanent discharges in a gaseous medium between two electrodes or between an electrode and a weldment, supplied by a welding power source, and having a certain voltage is called welding arc.
The inversion of welding power is a necessary trend in the development of welding power. The inverter type welding power supply has the advantages of small volume, light weight, energy saving and material saving, high response speed due to high working frequency, easy realization of complex output characteristics and improvement of welding process. Therefore, in the future, the inverter welding power supply is bound to be widely adopted by automatic and semi-automatic welding equipment and a matched power supply of special complete welding equipment. However, the existing inverter welding machine is not mature enough, and 1) the performance and the reliability are still greatly improved; 2) the green is still not enough, the power consumption is large, and the energy utilization rate is low; 3) still analog power is dominant and no digitization is implemented.
The invention content is as follows:
in view of the above, there is a need to design a high-stability high-current arc welding power supply based on the inverter technology, which can overcome the above problems.
A high-stability high-current arc welding power supply based on an inverter technology comprises: a main circuit, a pulse width modulation control circuit, a drive circuit, an auxiliary switch power supply, a box body and a protection device,
the main circuit comprises a rectifying filter circuit, an inverter circuit, a transformer and an output rectifying filter circuit, and the front end of the main circuit is provided with an active filter circuit for converting input single-phase or three-phase power frequency alternating current into smooth adjustable direct current which can be used by a load;
the pulse width modulation control circuit comprises a PWM (pulse width modulation) circuit and is used for controlling the on-off of an IGBT (insulated gate bipolar transistor) switch tube group in the main circuit;
the driving circuit comprises an optocoupler chip 316J for providing electrical isolation between the control circuit and the main circuit;
the auxiliary switch power supply comprises a TOPSWITCH-II device which is used for supplying power to the pulse width modulation control circuit, the drive circuit and the active device in the main circuit;
the box body and the protection device comprise a case and a protection device, wherein the protection device comprises overvoltage and overcurrent protection, short-circuit protection and grounding protection and is used for protecting the arc welding power supply and operating personnel.
Preferably, the main circuit comprises a power frequency filter capacitor C1, a high-frequency filter capacitor C2, power switching tubes Q1-Q4 and a high-frequency transformer, and the power switching tubes are IGBT modules SKM150GB 128D.
Preferably, the PWM modulation circuit includes a chip TL494, positive phase input terminals of two comparison amplifiers inside the chip TL494 are respectively connected to the hall current sensor and the HCNR voltage transformation circuit, and negative phase input terminals are connected to a voltage division circuit of the reference voltage to obtain the comparison voltage.
Preferably, the package of the optocoupler chip 316J is an S0-16 package, and a pin 6 thereof is connected with a pull-up resistor and a capacitor.
Preferably, the TOPSWITCH-II device comprises an energy storage transformer, the TOPSWITCH-II device is of a TOPSWITCH224Y type, and the turns ratio of the energy storage transformer is 9.
Preferably, the machine box is an iron box with the thickness of 500mm by 500 mm.
The utility model discloses a: the main circuit, the pulse width modulation control circuit, the driving circuit, the auxiliary switching power supply, the box body and the protection device can stably output current of 0-30A and the maximum output current of 40A through working performance tests, and initially meet design requirements and engineering requirements. Meanwhile, the power supply has the advantages of high efficiency, energy conservation, light weight, small volume, good control performance, quick dynamic response and easy realization of real-time control.
Description of the drawings:
fig. 1 is a schematic structural diagram of an in-valve assembly of a high-stability high-current arc welding power supply based on an inverter technology in a preferred embodiment.
Fig. 2 is a circuit diagram of the arc welding power supply main circuit.
FIG. 3 is a schematic diagram of the peripheral circuitry of TL 494.
Fig. 4 is a schematic diagram of the peripheral circuit of 316J.
Fig. 5 is a schematic circuit diagram of the TOPSWITCH 224Y.
Fig. 6 is a schematic structural diagram of a chassis.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides an embodiment: a high-stability high-current arc welding power supply based on an inverter technology comprises: a main circuit, a pulse width modulation control circuit, a drive circuit, an auxiliary switch power supply, a box body and a protection device,
the main circuit comprises a rectifying filter circuit, an inverter circuit, a transformer and an output rectifying filter circuit, and the front end of the main circuit is provided with an active filter circuit for converting input single-phase or three-phase power frequency alternating current into smooth adjustable direct current which can be used by a load;
the pulse width modulation control circuit comprises a PWM (pulse width modulation) circuit and is used for controlling the on-off of an IGBT (insulated gate bipolar transistor) switch tube group in the main circuit;
the driving circuit comprises an optocoupler chip 316J for providing electrical isolation between the control circuit and the main circuit;
the auxiliary switch power supply comprises a TOPSWITCH-II device which is used for supplying power to the pulse width modulation control circuit, the drive circuit and the active device in the main circuit;
the box body and the protection device comprise a case and a protection device, wherein the protection device comprises overvoltage and overcurrent protection, short-circuit protection and grounding protection and is used for protecting the arc welding power supply and operating personnel.
The main circuit comprises a power frequency filter capacitor C1, a high-frequency filter capacitor C2, power switch tubes Q1-Q4 and a high-frequency transformer, wherein the power switch tubes are IGBT modules SKM150GB 128D.
The PWM modulation circuit comprises a chip TL494, positive phase input ends of two comparison amplifiers in the chip TL494 are respectively connected with a Hall current sensor and an HCNR transformation circuit, and negative phase input ends are connected with a voltage division circuit of reference voltage to obtain comparison voltage.
The package of the optical coupler chip 316J is an S0-16 package, and a pin 6 of the optical coupler chip is connected with a pull-up resistor and a capacitor.
The TOPSWITCH-II device comprises an energy storage transformer, the TOPSWITCH-II device is of a TOPSWITCH224Y type, and the turns ratio of the energy storage transformer is 9.
The machine case is an iron case with 500mm by 500 mm.
The working principle is as follows: the utility model comprises: the device comprises a main circuit, a pulse width modulation control circuit, a driving circuit, an auxiliary switching power supply, a box body and a protection device.
As shown in fig. 2, Cl at the periphery of the inverter is a power frequency filter capacitor, and C2 is a high frequency filter capacitor; the full-bridge inverter comprises main devices such as power switch tubes Q1-Q4, a high-frequency transformer and the like; the power switch tube adopts an IGBT module SKM150GB 128D; four follow current links consisting of fast recovery diodes are used for enabling the inverter circuit part to follow current in the dead time of all the turn-off sections of the IGBT; the C3 has the functions of blocking direct current and preventing magnetic bias, and prevents the IGBT unit from being burnt out by the short circuit of the primary side of the high-frequency transformer; the rectifier BRIDGE BRIDGE and the filter capacitor C4 form a full-BRIDGE rectification filter output circuit. In the circuit, two switch tubes Q1, Q4 or Q2, Q3 on the opposite sides of the bridge are turned on and off simultaneously. When the driving pulse signals drive the Q1 and the Q4 or the Q2 and the Q3 in turn, the direct-current voltage generated by the input rectifying and filtering circuit is converted into an alternating-current square wave of 20kHz and is sent to the high-frequency transformer, and the alternating-current square wave is output after voltage reduction, rectification and filtering.
As shown in fig. 3, in the peripheral circuit of TL494, external RT and CT realize setting of oscillation frequency (corresponding to R123 and Clll in the figure) 25K and 2nF, and the oscillation frequency is 20K. 1. Pins 2, 16 and 15 are the same-direction and reverse-direction input ends of two voltage comparison amplifiers, the positive-phase input ends of the two comparison amplifiers are respectively connected to the Hall current sensor and the HCNR voltage transformation circuit, and the reverse-phase input ends are connected to the voltage division circuit of the reference voltage to obtain the comparison voltage, so that the power supply can implement current limiting and voltage limiting protection while stabilizing the voltage. The 3 pin is a phase correction terminal and controls the pulse width output by the 8 and 11 terminals. Because the volt-ampere characteristic of the electric arc needs the power supply to be an approximate direct current power supply, the 3-pin external current sensor feeds back and adjusts the pulse width. Pin 12 is connected to an auxiliary power supply. The phase difference of the alternate output of the ends of the pins 8 and 11 is 180. The pulse signals respectively control two HCPL-316J chips, and correspond to diagonal arms of two half bridges of the full-bridge inverter.
As shown in FIG. 4, 316J selects S0-16 package, VM and VIN are positive and reverse input signal ends, and after internal optical coupling isolation and amplification, a driving signal with the same waveform as that of VJN + output is output at VOUT end. The gate-source voltage when the IGBT is conducted in the forward direction is Vg; when cut off in the reverse direction, VEE is present.
The capacitors (C3, C5, C6) of 0.1uF at the output end provide the working current during the transient state of switching conversion; a pull-up resistor R1 and a pull-up resistor C2 are connected with the pin 6; in order to prevent the IGBT from being damaged by applying voltage to the main loop when the gate pole is opened or damaged, a pull-down resistor is applied between the gate and the emitter to absorb the static current of about 650 pA; r3 is used for limiting an external current extraction network of the chip on the DESATW; the steepness of the front and back edges of the control pulse can be changed, the oscillation is prevented, the voltage peak of the IGBT collector electrode is reduced, and components and parts are protected.
As shown in fig. 5, when the TOPSWITCH switch is turned on, the voltage across the capacitor C1 is applied to the primary side of the flyback transformer, the current flowing through the primary winding increases linearly, and the transformer stores energy; when the TOPSWITCH tube is turned off, the primary side current of the inductor suddenly changes to zero due to no loop, the transformer follows current through the secondary side, the secondary side current is K times of the primary side current when the TOPSWITCH tube is turned off, the secondary side winding charges a capacitor C2 through a diode VD2, and then the current flowing through the secondary side of the transformer linearly drops.
As shown in fig. 6, in the design of the chassis, in consideration of the compactness, stability and aesthetic property of the overall structure of each component inside the chassis, bakelite plates (thickness 5mm,450mm × 450mm) and M8 bolts are used to fix the following components: the power-driven voltage regulator, the high-frequency transformer, the IGBT module (with radiating fins), the PCB and the filter inductance and capacitance are fixed by common bolts.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A high-stability high-current arc welding power supply based on an inverter technology comprises: the power supply comprises a main circuit, a pulse width modulation control circuit, a driving circuit, an auxiliary switching power supply, a box body and a protection device, and is characterized in that the main circuit comprises a rectifying filter circuit, an inverter circuit, a transformer and an output rectifying filter circuit, and the front end of the main circuit is provided with an active filter circuit which is used for converting input single-phase or three-phase power frequency alternating current into smooth adjustable direct current which can be used by a load;
the pulse width modulation control circuit comprises a PWM (pulse width modulation) circuit and is used for controlling the on-off of an IGBT (insulated gate bipolar transistor) switch tube group in the main circuit;
the driving circuit comprises an optocoupler chip 316J for providing electrical isolation between the control circuit and the main circuit;
the auxiliary switch power supply comprises a TOPSWITCH-II device which is used for supplying power to the pulse width modulation control circuit, the drive circuit and the active device in the main circuit;
the box body and the protection device comprise a case and a protection device, wherein the protection device comprises overvoltage and overcurrent protection, short-circuit protection and grounding protection and is used for protecting the arc welding power supply and operating personnel.
2. The high-stability high-current arc welding power supply based on the inverter technology as claimed in claim 1, wherein the main circuit comprises a power frequency filter capacitor C1, a high-frequency filter capacitor C2, power switching tubes Q1-Q4 and a high-frequency transformer, and the power switching tubes are IGBT modules SKM150GB 128D.
3. The high-stability high-current arc welding power supply based on the inverter technology as claimed in claim 1, wherein the PWM modulation circuit comprises a chip TL494, positive phase input terminals of two comparison amplifiers in the chip TL494 are respectively connected to the hall current sensor and the HCNR transforming circuit, and negative phase input terminals are connected to a voltage dividing circuit of a reference voltage to obtain a comparison voltage.
4. The high-stability high-current arc welding power supply based on the inverter technology as claimed in claim 1, wherein the package of the optocoupler chip 316J is an S0-16 package, and a pin 6 of the optocoupler chip is connected with a pull-up resistor and a capacitor.
5. The high-stability high-current arc welding power supply based on the inverter technology as claimed in claim 1, wherein the TOPSWITCH-II device comprises an energy storage transformer, the TOPSWITCH-II device is of a TOPSWITCH224Y, and the turns ratio of the energy storage transformer is 9.
6. The high-stability high-current arc welding power supply based on the inverter technology as claimed in claim 1, wherein the case is an iron case with a size of 500mm x 500 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921264776.9U CN210412978U (en) | 2019-08-06 | 2019-08-06 | High-stability high-current arc welding power supply based on inverter technology |
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| CN201921264776.9U CN210412978U (en) | 2019-08-06 | 2019-08-06 | High-stability high-current arc welding power supply based on inverter technology |
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| CN210412978U true CN210412978U (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984709A (en) * | 2023-09-26 | 2023-11-03 | 深圳比斯特自动化设备有限公司 | High-frequency inversion direct-current welding power supply circuit |
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2019
- 2019-08-06 CN CN201921264776.9U patent/CN210412978U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984709A (en) * | 2023-09-26 | 2023-11-03 | 深圳比斯特自动化设备有限公司 | High-frequency inversion direct-current welding power supply circuit |
| CN116984709B (en) * | 2023-09-26 | 2023-12-05 | 深圳比斯特自动化设备有限公司 | High-frequency inversion direct-current welding power supply circuit |
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