CN210080918U - Double-pulse MIG welding power supply based on SiC power device - Google Patents
Double-pulse MIG welding power supply based on SiC power device Download PDFInfo
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- CN210080918U CN210080918U CN201920616962.8U CN201920616962U CN210080918U CN 210080918 U CN210080918 U CN 210080918U CN 201920616962 U CN201920616962 U CN 201920616962U CN 210080918 U CN210080918 U CN 210080918U
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Abstract
The utility model provides a dipulse MIG welding power supply based on SiC power device, its characterized in that: comprises a main circuit and a digital control circuit; the main circuit comprises a power frequency rectifying and filtering module, a SiC high-frequency inversion module I, a high-frequency transformer I and a SiC rapid full-wave rectifying and filtering module I which are sequentially connected; the SiC rapid full-wave rectification filter module I is connected with a load; the digital control circuit comprises a digital man-machine interaction module, a core control module, a SiC high-frequency driving module, a load voltage and current detection feedback module and a wire feeding control module. The power supply can give consideration to both high power and high inversion frequency, is favorable for realizing energy control refinement, achieves the effects of low energy consumption, high efficiency and high energy density, and can fully exert the potential of the double-pulse welding process.
Description
Technical Field
The utility model relates to a welding equipment technical field, more specifically say, relate to a dipulse MIG welding power supply based on SiC power device.
Background
The double-pulse MIG welding technology controls the molten drop transition through pulse current to obtain an ideal molten drop transition form, has the characteristics of wide current regulation range, easy realization of all-position welding, effective control of heat input, easy realization of automation and the like, and has the effect of stirring a molten pool by electric arc force generated by the change of average current, so that the gas hole occurrence rate can be reduced, crystal grains are refined, and the double-pulse MIG welding technology is very widely applied to high-efficiency automatic welding industrial occasions. The double-pulse MIG welding power source is the core equipment of the pulse MIG welding system, and the comprehensive performance of the double-pulse MIG welding power source directly influences the aspects of the actual welding process effect, the welding system equipment integration, the production energy consumption, the cost and the like.
At present, a Si-based power device is generally adopted in a double-pulse MIG welding power source, and due to the inherent limitation of the Si-based power device, the double-pulse MIG welding power source based on the Si-based power device has many defects. In particular, the following problems mainly exist with the current double pulse MIG welding power sources:
(1) high power and high inversion frequency are difficult to be considered;
(2) the energy control precision is not fine enough;
(3) the energy density is to be further improved.
For example, the invention patent of china (publication No. 102091850B) of aluminum alloy digital welding machine with smooth transition double-pulse parameters adopts Si IGBT as a switching device, because the switching speed of Si IGBT is relatively slow, there is trailing current in the turn-off process, if the inversion frequency is directly and greatly increased, the switching loss becomes unacceptable, so the inversion frequency is generally 20 kHz. The inverter type welding power supply realizes energy output control by adjusting the on-off of a power device at a high frequency, and because the double-pulse MIG welding power supply based on the SiIGBT is limited by switching loss, the inverter frequency is difficult to promote, the time constant of a main loop is large, the energy control period is long, and the energy control period is relatively extensive.
For example, the chinese utility model patent "MOSFET inversion argon arc welding machine" (publication number: 201201107Y) adopts the Si MOSFET as the switching device, and can increase the inversion frequency to several times of the IGBT welding machine, because the Si MOSFET has low withstand voltage and small current capacity, the maximum output current of the welding machine is only 160A, the rated power is 3.2kW, and the requirement of the high-power welding occasion can not be satisfied.
For the gas metal arc welding machine NB-400 produced in Beijing times, Si IGBT is adopted as a switching device, the rated current is 400A, the power efficiency is 85%, the power weight is 41kg, the energy consumption is relatively high, the requirement on the heat dissipation condition is strict, and the adoption of a heat dissipation device with large volume makes the design of the heat dissipation scale complicated, is not beneficial to the miniaturization and the light weight of the welding machine, so the defect in the aspect of energy density exists.
SUMMERY OF THE UTILITY MODEL
For overcoming the shortcoming and not enough among the prior art, the utility model aims to provide a because wide forbidden band power device SiC power device, can compromise high-power and high contravariant frequency, be favorable to realizing that energy control is meticulous, low energy consumption, high efficiency, high energy density's dipulse MIG welding power supply.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a dipulse MIG welding power supply based on SiC power device which characterized in that: comprises a main circuit and a digital control circuit; the main circuit comprises a power frequency rectifying and filtering module, a SiC high-frequency inversion module I, a high-frequency transformer I and a SiC rapid full-wave rectifying and filtering module I which are sequentially connected; the SiC rapid full-wave rectification filter module I is connected with a load;
the digital control circuit comprises a digital man-machine interaction module, a core control module, a SiC high-frequency driving module, a load voltage and current detection feedback module and a wire feeding control module; the digital man-machine interaction module is connected with the core control module; one end of the SiC high-frequency driving module is connected with the PWM output end of the core control module, and the other end of the SiC high-frequency driving module is connected with the first SiC high-frequency inversion module; one end of the load voltage and current detection feedback module is connected with the load, and the other end of the load voltage and current detection feedback module is connected with an A/D conversion end of the core control module; one end of the wire feeding control module is connected with the core control module, and the other end of the wire feeding control module is connected with a direct current motor of the wire feeder.
Preferably, the first SiC high-frequency inverter module comprises a SiC power switch tube Q1, a SiC power switch tube Q2, a SiC power switch tube Q3 and a SiC power switch tube Q4; the SiC power switch tube Q1, the SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 are respectively connected with a RC absorption circuit I in parallel; the SiC power switch tube Q1, the SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 form a full-bridge inverter circuit, and then a DC blocking capacitor C is used for blocking DC currentbThe primary connection with the high-frequency transformer I;
the first SiC rapid full-wave rectification filter module comprises a SiC Schottky diode group DR1 and a SiC Schottky diode group DR 2; the secondary output end I of the high-frequency transformer I is connected with the secondary output end III of the high-frequency transformer I through a SiC Schottky diode group DR1 and a SiC Schottky diode group DR2 which are connected in sequence; the junction of the SiC Schottky diode group DR1 and the SiC Schottky diode group DR2 is connected with one end of the load, and the secondary output end of the first high-frequency transformer is connected with the other end of the load through an output filter reactance Lr.
Preferably, the SiC schottky diode group DR1 and the SiC schottky diode group DR2 are both composed of three SiC schottky diodes and a second RC absorption circuit connected in parallel.
Preferably, the main circuit further comprises a second SiC high-frequency inverter module, a second high-frequency transformer and a second SiC rapid full-wave rectification filter module which are sequentially connected; the SiC high-frequency inversion module II is connected with the power frequency rectification filtering module, and the SiC rapid full-wave rectification filtering module II is connected with a load; the other end of the SiC high-frequency driving module is also connected with a second SiC high-frequency inversion module; the topological structure of the SiC high-frequency inversion module II is the same as that of the SiC high-frequency inversion module I; the topological structure of the high-frequency transformer II is the same as that of the high-frequency transformer I; and the topological structure of the second SiC rapid full-wave rectification and filtering module is the same as that of the second SiC rapid full-wave rectification and filtering module.
Preferably, the wire feed control module comprises: the wire feeding control chip, the CAN communication circuit, the H-bridge driving circuit and the direct current motor voltage feedback circuit;
the wire feeding control chip is in signal connection with the core control module through the CAN communication circuit so as to realize the communication between the wire feeding control chip and the core control module; the wire feeding control chip is connected with a wire feeder direct current motor through an H-bridge driving circuit so as to drive the wire feeder direct current motor to work; the direct current motor voltage feedback circuit is used for detecting the direct current motor voltage of the wire feeder in real time; the direct current motor voltage feedback circuit is connected with the wire feeding control chip to realize the closed-loop control of the direct current motor of the wire feeder.
Compared with the conventional multifunctional welding power supply, the utility model optimally designs the wire feeding control system around the double-pulse welding, for example, the Chinese invention patent 'full-digital SiC inverter type multifunctional argon arc welding power supply based on DSC' (publication number: 106392262B), although the welding power supply is developed by applying SiC power devices, the optimized development of the wire feeder control is not carried out aiming at the double-pulse MIG welding; the utility model adopts the H-bridge driving mode, realizes the stepless speed regulation of the wire feeder, and realizes multiple working modes such as positive rotation, reverse rotation, pulsation and the like; the CAN communication circuit is fully utilized to carry out cooperative control of wire feeding and a welding power supply, and double-pulse MIG welding CAN be realized through single pulse and pulse wire feeding or low-frequency modulation and constant-speed wire feeding.
Preferably, the H-bridge driving circuit comprises a switching tube Qf1, a switching tube Qf2, a switching tube Qf3, a switching tube Qf4, a brake resistor BRK1 and a relay JD 1; the switch tube Qf1, the switch tube Qf2, the switch tube Qf3 and the switch tube Qf4 form an H-bridge topology; the output end of the H-bridge topology is connected with a direct current motor of the wire feeder; and the brake resistor BRK1 and the relay JD1 are connected in series and then connected in parallel at the output end of the H-bridge topology.
Preferably, the core control module refers to a high-speed DSC core control module.
Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:
1. the high power and the high inversion frequency are considered: the utility model applies the SiC power device with the advantages of high voltage resistance, low loss, high switching speed and the like to the power conversion main circuit of the double-pulse MIG welding power supply, can stably realize 400A-level 200kHz ultrahigh frequency inversion, the inversion frequency is improved to more than 5 times of that of the existing Si IGBT welding power supply, the rated output power of the power supply is far higher than that of the existing Si MOSFET welding power supply, and the application requirement of a high-power welding occasion can be met;
2. and (3) refining double-pulse MIG welding energy control: the utility model discloses a dipulse MIG welding power supply contravariant frequency can be up to 200kHz, has widened output pulse frequency range, has stronger electric arc energy regulating power, can realize the fine control to output current, coordinates variable speed pulsation send silk or realizes the low frequency modulation better, more is favorable to exerting dipulse welding process potentiality; in addition, the processes of constant current, constant voltage, single pulse gas shielded welding and the like can be realized by adjusting the output signal of the SiC high-frequency driving module;
3. low energy consumption, high efficiency, high energy density: the utility model adopts a full SiC power device which has the characteristics of low on-resistance and high switching speed, so that the on-loss and the switching loss are reduced, and the energy efficiency can reach more than 92%; the miniaturization and the light weight of the welding machine can be realized, and the energy density is improved;
4. the main circuit adopts a double-loop parallel structure, so that the output power can be further improved, and the sufficient margin is ensured;
5. the utility model adopts the H-bridge driving mode, realizes the stepless speed regulation of the wire feeder, and realizes multiple working modes such as positive rotation, reverse rotation, pulsation and the like; the CAN communication circuit is fully utilized to carry out cooperative control of wire feeding and a welding power supply, double-pulse MIG welding CAN be realized by single pulse and pulse wire feeding or low-frequency modulation and constant-speed wire feeding, and wire feeding control optimization is realized for the double-pulse MIG welding; the method can realize fine control of energy so as to better match with pulse wire feeding, and also widen the effective setting range of low-frequency modulation parameters.
Drawings
FIG. 1 is a schematic diagram of the overall framework of a double-pulse MIG welding power supply based on SiC power devices according to the present invention;
FIG. 2 is a circuit diagram of a main circuit in a double-pulse MIG welding power supply based on SiC power devices;
FIG. 3 is a schematic structural diagram of a wire feeding control module of a digital control circuit in a double-pulse MIG welding power supply based on a SiC power device according to the present invention;
FIG. 4 is a schematic diagram of an H-bridge driving circuit in a double-pulse MIG welding power supply based on SiC power devices according to the present invention;
FIG. 5 is a flowchart of a double-pulse MIG welding operation of the SiC power device based double-pulse MIG welding power supply of the present invention;
FIG. 6 is a schematic diagram of the low frequency modulated welding current waveform of the SiC power device based double pulse MIG welding power supply of the present invention;
FIG. 7 is a schematic diagram of an overall framework of a double pulse MIG welding power supply of a second embodiment based on SiC power devices;
FIG. 8 is a circuit diagram of the main circuit of a two-pulse MIG welding power supply based on a SiC power device according to a second embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
The structure of the double-pulse MIG welding power supply based on the SiC power device is shown in figures 1 to 6 and comprises a main circuit and a digital control circuit.
As shown in fig. 1, the main circuit comprises a power frequency rectifying and filtering module, a SiC high-frequency inverter module i, a high-frequency transformer i and a SiC fast full-wave rectifying and filtering module i which are connected in sequence; the power frequency rectification filtering module is connected with a three-phase alternating current power supply, and the SiC rapid full-wave rectification filtering module I is connected with a load.
Specifically, as shown in fig. 2, the first SiC high-frequency inverter module includes a SiC power switch Q1, a SiC power switch Q2, a SiC power switch Q3 and a SiC power switch Q4; the SiC power switch tube Q1, the SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 are respectively connected with a RC absorption circuit I in parallel; SiC power switch tube Q1The SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 form a full-bridge inverter circuit, and then a DC blocking capacitor C is used for blocking the DC voltagebThe SiC power switch tube is connected with the primary side of the high-frequency transformer I to prevent magnetic saturation, and can be directly used for follow current without additionally connecting a follow current diode in reverse parallel because a parasitic diode of the SiC power switch tube has good performance and quick reverse recovery, thereby simplifying the circuit structure.
The first SiC rapid full-wave rectification filter module comprises a SiC Schottky diode group DR1 and a SiC Schottky diode group DR 2; the secondary output end I of the high-frequency transformer I is connected with the secondary output end III of the high-frequency transformer I through a SiC Schottky diode group DR1 and a SiC Schottky diode group DR2 which are connected in sequence; the junction of the SiC Schottky diode group DR1 and the SiC Schottky diode group DR2 is connected with one end of the load, and the secondary output end of the first high-frequency transformer is connected with the other end of the load through an output filter reactance Lr.
Preferably, the SiC schottky diode group DR1 and the SiC schottky diode group DR2 are both composed of three SiC schottky diodes and a second RC absorption circuit connected in parallel.
The digital control circuit comprises a digital man-machine interaction module, a core control module, a SiC high-frequency driving module, a load voltage and current detection feedback module and a wire feeding control module; the digital man-machine interaction module is connected with the core control module; one end of the SiC high-frequency driving module is connected with the PWM output end of the core control module, and the other end of the SiC high-frequency driving module is connected with the first SiC high-frequency inversion module; one end of the load voltage and current detection feedback module is connected with the load, and the other end of the load voltage and current detection feedback module is connected with an A/D conversion end of the core control module; one end of the wire feeding control module is connected with the core control module, and the other end of the wire feeding control module is connected with a direct current motor of the wire feeder.
The utility model discloses to possess the SiC power device of advantages such as withstand voltage height, the loss is low, switching speed is fast and be applied to dipulse MIG welding power supply power conversion main circuit, can stably realize 400A rank 200kHz hyperfrequency contravariant, the contravariant frequency promotes to have more than 5 times of SiIGBT welding power supply, and power rated output power is far higher than current Si MOSFET welding power supply, can satisfy the application needs of high-power welding occasion.
The utility model discloses a dipulse MIG welding power supply contravariant frequency can be up to 200kHz, has widened output pulse frequency range, possesses stronger electric arc energy regulatory ability, can realize the meticulous control to output current, coordinates variable speed pulsation better and send a or realize low frequency modulation, has the technology potentiality.
The utility model discloses a full SiC power device, it has the characteristics of low on-resistance and high switching speed for turn-on loss and switching loss reduce, and the efficiency further improves and can reach more than 92%.
The core control module is preferably referred to as a high speed DSC core control module.
The digital control circuit adopts a three-core structure, and the digital man-machine interaction module, the high-speed DSC core control module and the wire feeding control module are respectively controlled by one control chip which operates independently. For example, the high-speed DSC core control module may be a control chip of model STM32F405RGT 6; the digital man-machine interaction module realizes man-machine interaction functions such as welding parameter setting, display and the like, and realizes cooperative control with the high-speed DSC core control module by adopting bus communication; the high-speed DSC core control module mainly completes tasks such as welding process task control, PWM signal generation, output waveform modulation, closed-loop control algorithm and the like.
The high-speed DSC core control module controls the progress of the flow task by monitoring each switching semaphore and the identifier of the welding process; the high-speed DSC core control module compares the welding current value and the voltage value which are subjected to A/D conversion by the load voltage and current detection feedback module with the set parameters of a user, and calculates by a closed-loop control algorithm to continuously change the pulse width of the PWM signal so as to stabilize the actual output at the set parameters. The high-speed DSC core control module generates four paths of PWM signals corresponding to driving signals of high-frequency inversion modules of two parallel circuits of a main circuit by different channels of the same timer through a center alignment mode; the high-speed DSC core control module can realize the modulation of the output waveform of the welding power supply by switching the welding parameters at regular time according to a certain rule through a timer.
The SiC high-frequency driving module can adopt the prior art, for example, the SiC high-frequency driving module disclosed in detail in the chinese patent application "a high-efficiency driving circuit suitable for wide bandgap power device" (publication No. 108173419 a). The SiC high-frequency driving module has the functions of isolating and amplifying the PWM signal of the high-speed DSC core control module to form a specific driving waveform of the SiC power switching tube and has the functions of desaturation protection and the like, and the specific circuit structure comprises a three-terminal voltage regulator, an isolated DC/DC power supply module, a driving integrated chip and a high-speed switching diode; different drive integrated chips can isolate PWM input and drive output from the high-speed DSC core control module through different isolation modes such as transformer isolation, magnetic isolation, optical coupling isolation, capacitance isolation and the like, and the isolated DC/DC power supply module and the three-terminal regulator form a power supply part of the SiC high-frequency drive module to respectively supply power for the isolated input end and the isolated output end of the drive integrated chip, so that both ends are ensured to be electrically and reliably isolated. The anode of the high-speed switching diode is connected with a desaturation detection pin of the driving integrated chip, and the cathode of the high-speed switching diode is connected with the drain of the SiC power switching tube. The built-in power supply of the driving integrated chip forms a loop with the SiC power switch tube through the desaturation detection pin, the diode and the SiC power switch tube, when the SiC power switch tube passes a large current or is short-circuited, the voltage detected by the desaturation detection pin exceeds a desaturation judgment value, the chip immediately carries out corresponding processing and closes driving output, and protection of a power device and even a welding power supply system is achieved.
The load voltage and current detection feedback module can adopt the prior art, for example, a load electric signal detection module disclosed in detail in the Chinese invention patent full-digital SiC inverter type multifunctional argon arc welding power supply (publication number: 106392262B). The load voltage and current detection feedback module specifically comprises a Hall sensor and a voltage follower; the Hall sensor carries out non-contact measurement on load voltage/current, actual load voltage/current is converted into corresponding voltage value output within a measuring range, the output of the Hall sensor is connected with the input of the voltage follower, the voltage follower has the characteristics of high input impedance and low output impedance and can play the roles of further buffering and isolating, and the output end of the voltage follower is connected with the A/D conversion module of the high-speed DSC core control module to form a welding voltage/current feedback loop.
As shown in FIG. 3, the wire feed control module includes a wire feed control chip, a CAN communication circuit, an H-bridge drive circuit, and a DC motor voltage feedback circuit.
The wire feeding control chip is in signal connection with the core control module through the CAN communication circuit so as to realize the communication between the wire feeding control chip and the core control module; the wire feeding control chip is connected with the wire feeder direct current motor through an H-bridge driving circuit so as to drive the wire feeder direct current motor to work; the direct current motor voltage feedback circuit is used for detecting the direct current motor voltage of the wire feeder in real time; the direct current motor voltage feedback circuit is connected with the wire feeding control chip to realize the closed-loop control of the direct current motor of the wire feeder. The voltage feedback circuit of the direct current motor can adopt the prior art, for example, a load electric signal detection module disclosed in detail in Chinese invention patent full-digital SiC inverter type multifunctional argon arc welding power supply (publication number: 106392262B) based on DSC.
Preferably, the H-bridge driving circuit comprises a switching tube Qf1, a switching tube Qf2, a switching tube Qf3, a switching tube Qf4, a brake resistor BRK1 and a relay JD 1; the switch tube Qf1, the switch tube Qf2, the switch tube Qf3 and the switch tube Qf4 form an H-bridge topology; the output end of the H-bridge topology is connected with a direct current motor of the wire feeder; and the brake resistor BRK1 and the relay JD1 are connected in series and then connected in parallel at the output end of the H-bridge topology. The left half bridge is used for controlling the rotating speed of the direct current motor of the wire feeder, and the right half bridge is used for switching the rotation direction of the direct current motor of the wire feeder; one end of the direct current motor voltage feedback circuit is connected with the direct current motor of the wire feeder, and the other end of the direct current motor voltage feedback circuit is connected with an A/D conversion module of the wire feeding control chip; the basic working principle of the wire feeding control module is as follows: the wire feeding control chip and the high-speed DSC core control module realize the rapid and stable transmission of data through the CAN communication circuit, and the set parameters of the wire feeding speed including the steering and the rotating speed are obtained; controlling the wire feeder to rotate forwards quickly, switching off the switch tube Qf2, switching on the switch tube Qf4, driving the PWM signal duty ratio of the switch tube Qf1 to be far greater than that of the switch tube Qf3, and rotating backwards in the same way; when the wire feeder is controlled to brake, the PWM signals for driving the four switching tubes are closed, meanwhile, the relay JD1 is closed, and the regenerative electric energy for stopping the direct current motor of the wire feeder is consumed on the brake resistor BRK 1; the direct current motor voltage feedback circuit samples the voltage of the direct current motor of the wire feeder in real time, and due to the fact that a certain corresponding relation exists between the rotating speed of the direct current motor of the wire feeder and the voltage of the direct current motor of the wire feeder, the wire feeding control chip compares the voltage fed back by sampling with a set value, and after algorithm operation processing, PWM output is adjusted, so that the wire feeding speed is kept stable finally, and closed-loop control is achieved.
Compared with the conventional multifunctional welding power supply, the utility model optimally designs the wire feeding control system around the double-pulse welding, for example, the Chinese invention patent 'full-digital SiC inverter type multifunctional argon arc welding power supply based on DSC' (publication number: 106392262B), although the welding power supply is developed by applying SiC power devices, the optimized development of the wire feeder control is not carried out aiming at the double-pulse MIG welding; the utility model adopts the H-bridge driving mode, realizes the stepless speed regulation of the wire feeder, and realizes multiple working modes such as positive rotation, reverse rotation, pulsation and the like; the CAN communication circuit is fully utilized to carry out cooperative control of wire feeding and a welding power supply, and double-pulse MIG welding CAN be realized through single pulse and pulse wire feeding or low-frequency modulation and constant-speed wire feeding.
The utility model discloses a basic operating principle does: the input part of the main circuit is connected with a three-phase power supply, and three-phase power frequency alternating current is converted into smoother high-voltage direct current after passing through a power frequency rectifying and filtering module; the high-speed DSC core control module generates a proper PWM signal through control algorithm operation according to the difference between the preset value of the digital man-machine interaction module and the feedback value of the load voltage and current detection feedback module, the signal is isolated and amplified by the SiC high-frequency driving module and then drives the SiC high-frequency inversion module to convert current according to ultrahigh frequency such as 200kHz, and smooth high-voltage direct current is converted into high-frequency high-voltage alternating current square waves; the high-frequency high-voltage alternating-current square wave is electrically isolated, power is transmitted, and voltage is converted and transmitted to a secondary side through a high-frequency transformer I to be changed into a high-frequency low-voltage alternating-current square wave; and finally, obtaining smooth low-voltage direct current through the SiC rapid full-wave rectification filter module I and outputting the low-voltage direct current to a load. As shown in fig. 5, under the scheduling of the high-speed DSC core control module, the coordinated control of the welding power supply and the wire feeder is realized through the CAN network of the wire feeding control module, and the steps of the double-pulse MIG welding are sequentially performed to complete the flows of advanced gas feeding, no-load wire feeding and arc striking, double-pulse welding output, arc closing, and delayed gas feeding protection.
The utility model discloses realize that dipulse MIG welded method is by two kinds: firstly, a welding power supply outputs a single pulse to be matched with the pulse wire feeding of a wire feeder to carry out double-pulse welding; and secondly, the welding power supply outputs low-frequency modulation waveforms to be matched with the constant-speed wire feeding of the wire feeder to realize double-pulse welding. The specific working principle is as follows: low-frequency modulation + constant-speed wire feeding: the working mode of the welding power supply is set to be a double-pulse mode through the digital man-machine interaction module, and the constant-speed wire feeding speed and double-pulse current waveform parameters are set. As shown in fig. 6, the double-pulse current waveform parameters include: a strong pulse group peak value Ips, a strong pulse group base value Ibs, a strong pulse group peak value time Tps, a strong pulse group base value time Tbs, a weak pulse group peak value Ipw, a weak pulse group base value Ibw, a weak pulse group peak value time Tpw and a weak pulse group base value time Tbw; the wire feeding speed is kept constant in the welding process, and a double-pulse waveform with overlapped strong and weak pulses is generated by the output of a power supply; single pulse output + pulsed wire feed: the working mode of the welding power supply is set to be a pulse mode through a digital panel, and pulse current waveform parameters are set: a peak value Ip, a base value Ib, a peak time tp and a base time tb; setting a peak wire feeding speed Vp and a base value wire feeding speed Vb; the pulse current and the pulse wire feeding are matched to form a double-pulse MIG welding condition; the utility model discloses a dipulse MIG welding power supply adopts novel SiC power switch tube, and contravariant frequency can be up to 200kHz, and dynamic performance is excellent, and response time is extremely short, thereby can realize the fine control of energy and cooperate the pulsation better and send a silk, has widened the effective settlement scope of low frequency modulation parameter again, provides the realization platform for exploring the new technological parameter combination of dipulse.
The utility model discloses an it is the MIG welding of dipulse to prefer welding process, carries out simple software change or parameter setting on this hardware platform and adjusts SiC high frequency drive module's output signal, also can realize processes such as constant current, constant voltage, monopulse gas shielded welding.
Example two
The present embodiment is a double-pulse MIG welding power source based on SiC power device, as shown in fig. 7 and 8, and the difference from the first embodiment is that: in the embodiment, the main circuit further comprises a second SiC high-frequency inverter module, a second high-frequency transformer and a second SiC rapid full-wave rectification filter module which are sequentially connected; the SiC high-frequency inversion module II is connected with the power frequency rectification filtering module, and the SiC rapid full-wave rectification filtering module II is connected with a load; the other end of the SiC high-frequency driving module is also connected with a second SiC high-frequency inversion module; the topological structure of the SiC high-frequency inversion module II is the same as that of the SiC high-frequency inversion module I; the topological structure of the high-frequency transformer II is the same as that of the high-frequency transformer I; and the topological structure of the second SiC rapid full-wave rectification and filtering module is the same as that of the second SiC rapid full-wave rectification and filtering module. The main circuit adopts a double-loop parallel structure, so that the output power can be further improved, and the sufficient margin is ensured. The rest of the structure of the present embodiment is the same as that of the first embodiment.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. The utility model provides a dipulse MIG welding power supply based on SiC power device which characterized in that: comprises a main circuit and a digital control circuit; the main circuit comprises a power frequency rectifying and filtering module, a SiC high-frequency inversion module I, a high-frequency transformer I and a SiC rapid full-wave rectifying and filtering module I which are sequentially connected; the SiC rapid full-wave rectification filter module I is connected with a load;
the digital control circuit comprises a digital man-machine interaction module, a core control module, a SiC high-frequency driving module, a load voltage and current detection feedback module and a wire feeding control module; the digital man-machine interaction module is connected with the core control module; one end of the SiC high-frequency driving module is connected with the PWM output end of the core control module, and the other end of the SiC high-frequency driving module is connected with the first SiC high-frequency inversion module; one end of the load voltage and current detection feedback module is connected with the load, and the other end of the load voltage and current detection feedback module is connected with an A/D conversion end of the core control module; one end of the wire feeding control module is connected with the core control module, and the other end of the wire feeding control module is connected with a direct current motor of the wire feeder.
2. The SiC power device-based double pulse MIG welding power supply of claim 1 wherein: the first SiC high-frequency inversion module comprises a SiC power switch tube Q1, a SiC power switch tube Q2, a SiC power switch tube Q3 and a SiC power switch tube Q4; the SiC power switch tube Q1, the SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 are respectively connected with a RC absorption circuit I in parallel; the SiC power switch tube Q1, the SiC power switch tube Q2, the SiC power switch tube Q3 and the SiC power switch tube Q4 form a full-bridge inverter circuit, and then a DC blocking capacitor C is used for blocking DC currentbThe primary connection with the high-frequency transformer I;
the first SiC rapid full-wave rectification filter module comprises a SiC Schottky diode group DR1 and a SiC Schottky diode group DR 2; the secondary output end I of the high-frequency transformer I is connected with the secondary output end III of the high-frequency transformer I through a SiC Schottky diode group DR1 and a SiC Schottky diode group DR2 which are connected in sequence; the junction of the SiC Schottky diode group DR1 and the SiC Schottky diode group DR2 is connected with one end of the load, and the secondary output end of the first high-frequency transformer is connected with the other end of the load through an output filter reactance Lr.
3. The SiC power device-based double pulse MIG welding power supply of claim 2, wherein: the SiC Schottky diode group DR1 and the SiC Schottky diode group DR2 are formed by connecting three SiC Schottky diodes and a RC absorption circuit II in parallel.
4. The SiC power device-based double pulse MIG welding power supply of claim 2, wherein: the main circuit further comprises a second SiC high-frequency inverter module, a second high-frequency transformer and a second SiC rapid full-wave rectification filter module which are sequentially connected; the SiC high-frequency inversion module II is connected with the power frequency rectification filtering module, and the SiC rapid full-wave rectification filtering module II is connected with a load; the other end of the SiC high-frequency driving module is also connected with a second SiC high-frequency inversion module; the topological structure of the SiC high-frequency inversion module II is the same as that of the SiC high-frequency inversion module I; the topological structure of the high-frequency transformer II is the same as that of the high-frequency transformer I; and the topological structure of the second SiC rapid full-wave rectification and filtering module is the same as that of the second SiC rapid full-wave rectification and filtering module.
5. The SiC power device-based double pulse MIG welding power supply of claim 1 wherein: the wire feed control module comprises: the wire feeding control chip, the CAN communication circuit, the H-bridge driving circuit and the direct current motor voltage feedback circuit;
the wire feeding control chip is in signal connection with the core control module through the CAN communication circuit so as to realize the communication between the wire feeding control chip and the core control module; the wire feeding control chip is connected with a wire feeder direct current motor through an H-bridge driving circuit so as to drive the wire feeder direct current motor to work; the direct current motor voltage feedback circuit is used for detecting the direct current motor voltage of the wire feeder in real time; the direct current motor voltage feedback circuit is connected with the wire feeding control chip to realize the closed-loop control of the direct current motor of the wire feeder.
6. The SiC power device based double pulse MIG welding power supply of claim 5, wherein: the H-bridge driving circuit comprises a switching tube Qf1, a switching tube Qf2, a switching tube Qf3, a switching tube Qf4, a brake resistor BRK1 and a relay JD 1; the switch tube Qf1, the switch tube Qf2, the switch tube Qf3 and the switch tube Qf4 form an H-bridge topology; the output end of the H-bridge topology is connected with a direct current motor of the wire feeder; and the brake resistor BRK1 and the relay JD1 are connected in series and then connected in parallel at the output end of the H-bridge topology.
7. The SiC power device-based double pulse MIG welding power supply of claim 2, wherein: the core control module refers to a high-speed DSC core control module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110000449A (en) * | 2019-04-30 | 2019-07-12 | 华南理工大学 | Synergic-pulsed MIG welding based on SiC power device connects power supply |
| CN112147478A (en) * | 2020-08-07 | 2020-12-29 | 北京交通大学 | Wide bandgap semiconductor power device parameter test platform and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000449A (en) * | 2019-04-30 | 2019-07-12 | 华南理工大学 | Synergic-pulsed MIG welding based on SiC power device connects power supply |
| CN112147478A (en) * | 2020-08-07 | 2020-12-29 | 北京交通大学 | Wide bandgap semiconductor power device parameter test platform and method |
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