CN106735740A - High power density high efficiency WBG arc welding inverters - Google Patents
High power density high efficiency WBG arc welding inverters Download PDFInfo
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- CN106735740A CN106735740A CN201611139417.1A CN201611139417A CN106735740A CN 106735740 A CN106735740 A CN 106735740A CN 201611139417 A CN201611139417 A CN 201611139417A CN 106735740 A CN106735740 A CN 106735740A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
Abstract
The invention provides a kind of high power density high efficiency WBG arc welding inverters, it is characterised in that：Including main circuit and closed control circuit；Main circuit includes the electromagnetic compatibility module, industrial frequency rectifying filtration module, WBG high frequency changes of current module, high-frequency power transformer and the filtering high-frequency rectifier module that are sequentially connected；Wherein, the external three-phase of electromagnetic compatibility module/single phase ac input power, the external arc load of filtering high-frequency rectifier module；Closed control circuit includes electric signal real-time detection module, human-computer interaction module, fault diagnosis module, controller and WBG high-frequency drives and protection module.The arc welding inverter has power density and efficiency higher, with excellent dynamic response performance and processing performance, with good reliability and stability.
Description
Technical field
The present invention relates to arc welding inversion technical field, more specifically to a kind of high power density high efficiency WBG arc-welding
Inverter.
Background technology
The source of welding current provides energy for welding arc, and its performance quality directly influences welding procedure effect.According to statistics,
Arc welding inverter has turned into the main product in domestic electric welding machine market, and towards Large Copacity, lightweight, high efficiency, modularization,
The directions such as intellectuality are developed.At present, the widely used power device of arc welding inverter (including MOSFET, IGBT, SBD, FRD
Deng) it is silicon semiconductor device.The switch performance of these Si power devices is with its structure design and improving for manufacturing process
Close to the theoretical limit determined by its material property, continue to improve and improve arc welding inverter performance by Si power device
Potentiality are extremely limited, in the urgent need to meeting requirements at the higher level of the source of welding current of new generation to device performance by new material.
Broad stopband (Wide Band Gap-WBG) semiconductor is primarily referred to as energy gap (conduction band minimum and valence band highest
Energy difference between point) it is more than the semi-conducting material of 2.2eV.Wide bandgap semiconductor is a kind of revolutionary power electronics material,
Its band gap is much larger than silicon semiconductor, can substantially reduce the wide gap of electrons cross, it is easier to control electric current and reduction energy consumption.With
GaN, SiC are that the semiconductor material with wide forbidden band of representative has breakdown field strength high, higher cutoff frequency, high thermoconductivity, Gao Jie
Gently the features such as good heat endurance, strong capability of resistance to radiation.These features of semi-conducting material enable WBG power devices
It is applied in the inefficient high temperature of traditional devices institute, strong radiation environment.
Arc welding inverter needs the harsh technique in high pressure, high current, high power frequently even unloaded-short-circuit arcing high
Worked long hours under environment, WBG power devices will undergo high voltage, high current, high-temperature, high-frequency and di/ very high
The collective effect of the multi-parameter complex stress such as dt, du/dt, their operational reliability has turned into WBG power devices and could succeed
It is applied to the key issue solved needed for arc welding inverter.Compared to Si power devices, the forward conduction curve of WBG power devices
There is notable difference with Reverse recovery curve, (such as C-V characteristic, forward voltage drop, the temperature of cut-in voltage threshold values are special for on-state characteristic
Property), resistance state characteristic (such as reverse blocking capability, reverse recovery characteristic and its heat endurance) and switching process (such as endophyte effect
Answer caused voltage overshoot and current spike and the correlation with temperature change) there is its particularity, in the process of running
Loss distribution (conduction loss, resistance state loss and reverse recovery loss) under the effect of high-frequency electromagnetic pulse energy is also with Si base power
Device has greatest differences.Therefore, WBG power devices can not directly substitute Si bases power device applications to arc welding inverter
In, and need further to set up the electrical model of WBG power devices, the simulation study of dynamic electro thermal coupling is carried out, so as to open up
The optimization design for flutterring structure and drive circuit lays the foundation.
The content of the invention
It is an object of the invention to overcome shortcoming of the prior art with deficiency, there is provided a kind of high power density is efficient
Rate, with excellent dynamic response performance and processing performance, the WBG arc welding inverters with good reliability and stability.
In order to achieve the above object, the technical scheme is that：A kind of high power density high efficiency
WBG arc welding inverters, it is characterised in that：Including main circuit and closed control circuit；The main circuit includes the electricity being sequentially connected
Magnetic compatible modules, industrial frequency rectifying filtration module, WBG high frequency changes of current module, high-frequency power transformer and filtering high-frequency rectifier module；
Wherein, the external three-phase of electromagnetic compatibility module/single phase ac input power, the external arc load of filtering high-frequency rectifier module；
The closed control circuit includes electric signal real-time detection module, human-computer interaction module, fault diagnosis module, control
Device and WBG high-frequency drives and protection module；
The WBG high-frequency drives and protection module respectively with WBG high frequency changes of current module, fault diagnosis module, electric signal reality
When detection module and controller connection；The fault diagnosis module also respectively with three-phase/single phase ac input power, WBG high frequencies
The connection of change of current module, high-frequency power transformer and controller；The electric signal real-time detection module also becomes with high frequency power respectively
The connection of depressor, arc load, controller and human-computer interaction module；The human-computer interaction module is also connected with controller.
Preferably, the WGB high frequencies change of current module includes WBG power device Q1, WBG power device Q2, WBG power devices
Q3, WBG power device Q4, sustained diode 7, sustained diode 8, sustained diode 9, sustained diode 10, electric capacity
C12, electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16 and inductance Lr；The high-frequency power transformer includes inductance Lm and change
Depressor T1；The filtering high-frequency rectifier module includes WBG power rectification pipe DR1, WBG power rectification pipes DR2, inductance Lo and electric capacity
C17；
The industrial frequency rectifying filtration module is in parallel with the series circuit that WBG power device Q1 and WBG power devices Q3 is constituted,
And it is in parallel with the series circuit that WBG power device Q2 and WBG power devices Q4 is constituted；Sustained diode 7 and electric capacity C12 divide
It is not connected in parallel on WBG power devices Q1；Sustained diode 8 and electric capacity C13 are connected in parallel on WBG power devices Q2 respectively；Afterflow two
Pole pipe D9 and electric capacity C14 are connected in parallel on WBG power devices Q3 respectively；Sustained diode 10 and electric capacity C15 are connected in parallel on WBG respectively
On power device Q4；The tie point of WBG power device Q1 and WBG power devices Q3 and WBG power device Q2 and WBG power devices
Connected by transformer T1 primary, electric capacity C16 and inductance Lr between the tie point of Q；Inductance Lm is connected in parallel in transformer T1 primary；
First output end of T1 level of transformer is by WBG power rectification pipes DR1, inductance Lo and electric capacity C17 and transformer T1 level
Second output end is connected；And the tie point of WBG power rectification pipe DR1 and inductance Lo passes through WBG power rectification pipe DR2 and transformation
The 3rd output end connection of T1 level of device；The arc load is in parallel with electric capacity C17.
Preferably, the WBG high-frequency drives include system-level malfunction detection process circuit, power stage failure with protection module
Detection process circuit, device level fault detect process circuit, drive pattern selection circuit, fault type output circuit, two-way magnetic
Impulsive quarantine transmission circuit, signal logic process circuit, signal conversion interface circuit, signal reconstruction circuit, power amplifier circuit
With high frequency high isolation type DC/DC power supply circuits；
The two-way magnetic field impulse isolation and transmission circuit is electric with signal logic process circuit, device level fault detect treatment respectively
Road and signal reconstruction circuit two-way signaling are connected；System level fault detect process circuit, drive pattern selection circuit, failure classes
Type output circuit and signal conversion interface circuit are connected with signal logic process circuit respectively；Two-way magnetic field impulse isolation and transmission circuit
It is connected with power amplifier circuit by signal reconstruction circuit；Device level fault detect process circuit is connected with power amplifier circuit.
Preferably, the electric signal real-time detection module includes high-frequency power transformer primary current high speed and precision rectified current
Road, arc load current detection circuit and arc load voltage real-time detection circuit.
Preferably, the fault diagnosis module includes input overvoltage/under-voltage diagnostic circuit and overheat diagnostic circuit.
Preferably, connected by soft start circuit module between the industrial frequency rectifying filtration module and WBG high frequency change of current modules
Connect；The soft start circuit module is also connected with controller.
Preferably, the soft start circuit module includes clocked flip-flop U201, relay RLY201, relay RLY202
With current-limiting resistance R201, and other peripheral auxiliary circuits.
The design fundamentals of arc welding inverter of the present invention are：The hyperfrequency WBG high-efficiency high powers for employing a new generation are close
Inversion new technology is spent to develop the new arc welding inverter of high-efficiency high-capacity density；Each WBG power in WGB high frequency change of current modules
Device, i.e. WBG power devices Q1, WBG power devices Q2, WBG power devices Q3 and WBG power device Q4, can both use SiC
Device, it would however also be possible to employ GaN device, faster, switching loss is lower for its switching speed, and voltage endurance capability is stronger, and heat-resisting ability is more
It is high.In the present invention, by three-phase/single phase ac input by turning into flat after electromagnetic compatibility module and industrial frequency rectifying filtration module
Sliding direct current, subsequently into WBG high frequency change of current modules, carries out power transmission and transformation by high-frequency power transformer afterwards, flows
Enter filtering high-frequency rectifier module transitions into low-voltage DC, there is provided to arc load.At the same time, the telecommunications of closed control circuit
The output current and voltage waveform of number real-time detection module one side real-time detection main circuit, while real-time detection high frequency power becomes
The primary side transient current waveform of depressor；The three road electric signals that electric signal real-time detection module will be detected first are pre-processed,
Then one side input controller carries out closed-loop control, meanwhile, electric signal real-time detection module can also be by the primary side after treatment
Transient current signal is compared with default overcurrent protection threshold value, by comparative result directly input to WBG high-frequency drives with
Protection module realizes the mechanical protection in advance to each WBG power device in WBG high frequency change of current modules；Controller is according to man-machine friendship
The given information that mutual module sends, the electric signal that electric signal real-time detection module is sent is closed according to default current-voltage is double
Ring control algolithm is processed, and produces corresponding PWM pulsewidth modulations Setting signal, inputs to WBG high-frequency drives and protection module,
Produce WBG high frequency change of current modules in each WBG power devices high-frequency/ultrahigh frequency open with the pwm signal required for shut-off, with obtain
Required output waveform and its electrical characteristics；Electric signal real-time detection module simultaneously also by the main circuit output current after treatment and
Voltage signal passes to human-computer interaction module, the real-time output for showing arc welding inverter；Fault diagnosis module real-time monitoring
Three-phase/single phase ac input voltage value, realizes over-pressed and under-voltage monitoring, additionally WBG in real-time monitoring WBG high frequencies change of current module
The actual temperature of power device and high-frequency power transformer, realizes overheat monitoring；Once break down, the side of fault diagnosis module one
Fault message input controller is carried out troubleshooting process by face, while failure is enabled into signal and being accessed WBG high-frequency drives and being protected
Shield module, turns off pwm signal, realizes the protection of loop of power circuit.
Compared with prior art, the invention has the advantages that and beneficial effect：
1st, arc welding inverter of the present invention has power density and efficiency higher：Changed as a result of efficiently WBG of new generation
Flow Technique, efficiency is energy-efficient up to more than 95%, compared to now widely used IGBT and MOSFET arc welding inversions inversion
Device, energy-conservation 10% or so, power density improves more than 30%, and cyclic duration factor is up to 100%；
2nd, arc welding inverter of the present invention possesses excellent dynamic response performance：The switch time of the WBG power devices of use
Microsecond grade is can reach, reverse frequency may be up to more than 500KHz, and the time constant of main circuit is very small, and dynamic response performance is excellent
Different, welding process stability is more preferable；
3rd, arc welding inverter of the present invention has excellent processing performance：Because reverse frequency of the invention is higher, dynamic
Can more preferably, controlling cycle is shorter so that the present invention is more easily implemented quick to welding arc and the precision of molten drop dynamic behaviour
Regulation and control, it is easy to obtain more preferable welding procedure quality；
4th, arc welding inverter of the present invention has more preferable reliability and stability：Due to the WBG power devices that the present invention is used
Part switching loss is lower, and heat-resisting ability is stronger, therefore with more preferable heat endurance and reliability；Meanwhile, the present invention is set
Various default detection and protection measures for possessing mechanical protection in advance ability so that the present invention under harsh arc-welding environment can
Further guarantee has been obtained by property.
Brief description of the drawings
Fig. 1 is the system principle block diagram of arc welding inverter of the present invention；
Fig. 2 is the main circuit schematic diagram of arc welding inverter of the present invention；
Fig. 3 is the WBG high-frequency drives and protection module functional-block diagram of arc welding inverter of the present invention；
Fig. 4 is the WBG high-frequency drives and protection module circuit theory diagrams of arc welding inverter of the present invention；
Fig. 5 is the electric signal real-time detection module principle figure of arc welding inverter of the present invention；
Fig. 6 is the fault diagnosis module schematic diagram of arc welding inverter of the present invention；
Fig. 7 is the human-computer interaction module schematic diagram of arc welding inverter of the present invention；
Fig. 8 is the system principle block diagram of the arc welding inverter of embodiment two；
Fig. 9 is the soft starting circuit schematic diagram of the arc welding inverter of embodiment two.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
As shown in Fig. 1~Fig. 7；High power density high efficiency WBG arc welding inverters include main circuit and closed control circuit.
Main circuit includes that the electromagnetic compatibility module being sequentially connected, industrial frequency rectifying filtration module, WBG high frequency changes of current module, high frequency power become
Depressor and filtering high-frequency rectifier module；Wherein, the external three-phase of electromagnetic compatibility module/single phase ac input power, high-frequency rectification filter
The external arc load of ripple module.
Closed control circuit include electric signal real-time detection module, human-computer interaction module, fault diagnosis module, controller and
WBG high-frequency drives and protection module.
WBG high-frequency drives are examined in real time with WBG high frequency changes of current module, fault diagnosis module, electric signal respectively with protection module
Survey module and controller connection；Fault diagnosis module also respectively with three-phase/single phase ac input power, WBG high frequency changes of current module,
High-frequency power transformer and controller are connected；Electric signal real-time detection module also respectively with high-frequency power transformer, arc load,
Controller and human-computer interaction module are connected；Human-computer interaction module is also connected with controller.
Main circuit both can be input into powering mode using single phase ac, it would however also be possible to employ three-phase alternating current is input into powering mode,
Both half-bridge circuit can be used, it would however also be possible to employ full-bridge circuit.As shown in Fig. 2 the present embodiment is only input into three-phase alternating current powering
It is introduced as a example by pattern, full-bridge circuit.
WGB high frequency changes of current module includes WBG power device Q1, WBG power device Q2, WBG power device Q3, WBG power
Device Q4, sustained diode 7, sustained diode 8, sustained diode 9, sustained diode 10, electric capacity C12, electric capacity C13,
Electric capacity C14, electric capacity C15, electric capacity C16 and inductance Lr；High-frequency power transformer includes inductance Lm and transformer T1；High-frequency rectification is filtered
Ripple module includes WBG power rectification pipe DR1, WBG power rectification pipes DR2, inductance Lo and electric capacity C17.
Industrial frequency rectifying filtration module is in parallel with the series circuit that WBG power device Q1 and WBG power devices Q3 is constituted, and
It is in parallel with the series circuit that WBG power device Q2 and WBG power devices Q4 is constituted；Sustained diode 7 and electric capacity C12 difference are simultaneously
It is associated on WBG power devices Q1；Sustained diode 8 and electric capacity C13 are connected in parallel on WBG power devices Q2 respectively；Fly-wheel diode
D9 and electric capacity C14 are connected in parallel on WBG power devices Q3 respectively；Sustained diode 10 and electric capacity C15 are connected in parallel on WBG power respectively
On device Q4；The tie point of WBG power device Q1 and WBG power devices Q3 is with WBG power device Q2 and WBG power devices Q's
Connected by transformer T1 primary, electric capacity C16 and inductance Lr between tie point；Inductance Lm is connected in parallel in transformer T1 primary；Become
First output end of T1 level of depressor by WBG power rectification pipes DR1, T1 level of inductance Lo and electric capacity C17 and transformer the
Two output ends are connected；And the tie point of WBG power rectification pipe DR1 and inductance Lo passes through WBG power rectification pipe DR2 and transformer
T1 the 3rd output end connection of level；Arc load R0 is in parallel with electric capacity C17.
In main circuit, three-phase alternating current input Ua, Ub, Uc are accessed by common mode inductance LCMC, resistance R1-R6, electric capacity C1-C9
The electromagnetic compatibility module of composition, suppresses electromagnetic noise and electromagnetic pollution, subsequently into by diode D1-D6, inductance Lc and electricity
Hold the industrial frequency rectifying filtration module that C10-C11 is constituted, be converted into smooth high voltage direct current.Then by WBG high frequency change of current moulds
Block, is converted into the square-wave pulse waveform of high-frequency/ultrahigh frequency；The voltage waveform by high-frequency power transformer carry out power transmission,
Voltage transformation and electrical isolation, obtain the ac square wave impulse waveform of magnitude of voltage change；The voltage waveform is again by high-frequency rectification
Filtration module, the smooth direct current electricity needed for being converted into technique, exports and gives arc load R0.Electric capacity C12-C15, inductance Lr, electric capacity
C16 can be different values according to the Working mode set of main circuit；WBG power device Q1-Q4 and WBG power rectification pipes DR1-
DR2 both can be able to be SiC power devices, or GaN power devices according to actual process requirements.
WBG high-frequency drives include system-level malfunction detection process circuit, power stage fault detect treatment electricity with protection module
Road, device level fault detect process circuit, drive pattern selection circuit, fault type output circuit, the isolation of two-way magnetic field impulse are passed
Transmission of electricity road, signal logic process circuit, signal conversion interface circuit, signal reconstruction circuit, power amplifier circuit and high frequency it is high every
Release DC/DC power supply circuits.Two-way magnetic field impulse isolation and transmission circuit respectively with signal logic process circuit, device level fault detect
Process circuit and signal reconstruction circuit two-way signaling are connected；System level fault detect process circuit, drive pattern selection circuit,
Fault type output circuit and signal conversion interface circuit are connected with signal logic process circuit respectively；Two-way magnetic field impulse isolation is passed
Transmission of electricity road is connected by signal reconstruction circuit with power amplifier circuit；Device level fault detect process circuit and power amplifier circuit
Connection.
Specifically, two-way magnetic field impulse isolation and transmission circuit is wound the high-frequency impulse transformation of low drain sense structure by bi-directional two-wire
Device T401 and T402 are constituted.Signal logic process circuit includes signal interlock protection circuit, differential circuit and time-delay reset circuit.
Wherein, signal interlock protection circuit include resistance R400-R405, high frequency weak current electrostatic protection diode D401-D406 and with
Not gate Schmidt trigger U401；Differential circuit includes MOSFET driving amplifiers U403, electric capacity C406-C409 and resistance
R415-R416；Time-delay reset circuit includes triode Q401-Q405, resistance R407-R414, electric capacity C401-C405 and monostable
Trigger U402.
System-level malfunction detection process circuit can be existing inverter input voltage, electric current and power device temperature rise
Detection circuit；Power stage fault detect process circuit can be the detection feedback of existing inverter output current and voltage signal
Circuit；Device level fault detect process circuit can be the general quick of existing detection WBG power device transient state turning-on voltages
Voltage comparator circuit.Additionally, signal conversion interface circuit, signal reconstruction circuit, power amplifier circuit, drive pattern selection electricity
Road, fault type output circuit and high frequency high isolation type DC/DC power supply circuits can use available circuit.
WBG high-frequency drives both may operate in half-bridge driven pattern with protection module, it is also possible to works in full-bridge and drives mould
Formula, the low and high level signal that is exported by drive pattern selection circuit is determined；The digital-to-analog PWM1 signals produced by controller
The electric signal that signal interface circuit is converted to appropriate voltage range is first passed around with PWM2 signals, subsequently into signal logic treatment
Circuit, the narrow pulse signal that the pulse signal modulation that dutycycle wide scope is changed is fixed for width, is then based on Magnetic isolation type
Signal modulation principle, by edge of a pulse coupled modes by two-way magnetic field impulse isolation and transmission circuit realize bi-directional and electrically
It is dielectrically separated from, then signal reconstruction circuit can be reconstructed according to phase and logical relation, and is obtained by power amplification circuit
Desired driving power and drive waveforms；Due to only needing the narrow pulse signal of transmission fixed width so that two-way magnetic field impulse isolation
The magnetic core of transmission circuit and the value of winding are very small, not only avoid the magnetic saturation for being easy to occur when traditional transformer drives and show
As, and leakage inductance and distribution capacity are also minimum, and when dutycycle wide drives, waveform is not easy to vibration, and isolation effect is good, effectively
Solve the high-speed bidirectional transmission of signal and reliable isolation problem.
To improve reliabilities and environmental suitability of the WBG power devices Q1-Q4 under harsh welding operating mode, WBG high frequencies drive
It is dynamic with protection module in be integrated with chip-scale, power stage and the three-level machinery protection in advance system such as system-level.System-level malfunction is examined
Survey the overheat that process circuit is mainly deficient/overvoltage, power device and the high-frequency power transformer being input into according to fault diagnosis module
The RST such as the output overcurrent detected Deng signal and electric signal real-time detection module and overvoltage, exports different level letters
Number, the enable of control signal logic processing circuit；Electric signal real-time detection module real-time detection high-frequency power transformer primary side is handed over
Stream peak value current waveform, and be compared with default threshold values by after high speed and precision rectification, fiducial value input power event
Barrier detection process circuit, and control signal logic processing circuit enable；And chip-scale detection predominantly detects WBG power devices
Q1-Q4 whether instantaneous overcurrent/short circuit/overvoltage, once there is corresponding failure, will directly control power amplifier circuit, one of make
Negative pressure waveform output state is directly in, WBG power devices are directly closed, the treatment time delay cut down the number of intermediate links is realized protecting in real time
Shield.
To ensure to drive reliability, the accuracy of stable and drive waveforms, WBG high-frequency drives and protection module in the present invention
100kHz push-pull type high-frequency isolation type DC/DC module for power supply circuits are creatively employed, only needs two-way 24V single supplies to power just
Can meet all of power demands of driver, including positive/negative driving required during the high-power WBG power devices ON/OFF of two-way
Waveform, driver reference voltage source and other component power demands, isolate pressure-resistant more than 4500V.
Electric signal real-time detection module includes three parts, i.e., by resistance R300-R305, operational amplifier U301-U302
With diode D300-D303 constitute high-frequency power transformer primary current high speed and precision rectification circuit, by resistance R306-
The arc load current detection circuit of R308, electric capacity C300-C302, diode D304-305 and operational amplifier U303 composition,
And the arc load being made up of resistance R309-R315, electric capacity C303-C307, operational amplifier U304-U306 and optocoupler U307
Voltage real-time detection circuit etc. is constituted.Wherein, IpIt is the primary current signal of high-frequency power transformer, IoIt is arc load electric current
Signal, UoIt is the voltage signal at arc load two ends；These three signals after treatment by all importing voltage signal converter
U308, is then conveyed to WBG high-frequency drives and protection module, controller and human-computer interaction module respectively.
Fault diagnosis module also mainly include two parts, i.e., by resistance R103, resistance R106, resistance R109, resistance R110,
Resistance R112, resistance R117, comparator U101, comparator U102, U104, electric capacity C124 and electric capacity C125 composition input overvoltage/
Under-voltage diagnostic circuit, and by inductance L101, inductance L102, electric capacity C126, electric capacity C127, resistance R111, resistance R113, two poles
Pipe D101, diode D102, comparator U103 etc. constitute overheat diagnostic circuit.Wherein, VC is three-phase/one-way communication input voltage
By the voltage signal after transformer pressure-reducing rectification, connected with resistance R106/R110 point by by resistance R103/R109
Pressure, the in-phase end and end of oppisite phase that the partial pressure value for being obtained respectively enters comparator U101 and U102 is compared with default set-point
Compared with if producing overvoltage and undervoltage condition, the output of comparator U101 and U102 occurs reversely.Similarly, overheating detection terminal
The thermistor being arranged on WBG power device Q1-Q4 radiators and high-frequency power transformer primary coil is directly connected to, should
Resistance is connected partial pressure with resistance R111；When the temperature increases, its resistance can change so that the end of oppisite phase of comparator U103
Voltage changes, and the magnitude of voltage is compared with the reference voltage level of the in-phase end of comparator U103, once temperature rise exceedes in advance
If value, the then output of comparator U103 will be inverted.The output signal of U104 and comparator U103 can be by phase inverter
Controller and WBG high-frequency drives and protection module are transferred to after U105 respectively.
Controller can both have been used with SG3525, UC3846, UC3879 etc. and simulate mould of the integrated pwm control signal as core
Intend controller, it would however also be possible to employ the digitial controller with microprocessors such as MCU, DSC as core；Can also be integrated using simulation
The modulus combined controller that pwm chip is combined with microprocessor, the present embodiment is only with DSC grades of ARM microprocessor
It is introduced as a example by the controller of core.Controller is main by DSC grades of ARM chip, chip power supply power supply, ADC power supplies, crystalline substance
Oscillating circuit, reset circuit and the JTAG modulation interfaces of shaking are interconnected by peripheral auxiliary circuits and constituted.JTAG modulation interfaces
Mainly realize debugging function.DSC grades of ARM chip is the central processing unit for entirely controlling circuit, is the core of Digital Control.
DSC grades of ARM chips nested current-voltage double-closed-loop control algorithm and its process control software, can produce half-bridge, complete
Various PWM count word signals needed for the different capacity commutating mode such as bridge, ZVS, ZVZCS；Complete output parameter and dynamic characteristic
Digitized Closed Loop regulates and controls；Various technological process switchings can be completed；Receive all kinds of status informations and fault-signal treatment；Pass through
CAN or UART interface carry out man-machine interaction with human-computer interaction module；Can also be by GPIO mouthfuls of all kinds of peripheral accessories of control
Or the action of mechanism.
Human-computer interaction module can both use key-press input+LED numeral methods pattern, or graphic control panel people
Machine interactive mode, can also be that simple potentiometer+pointer instrument such as shows at the mode.The present embodiment is only with to DSC microprocessors
The pattern of device+graphic control panel driver+graphic control panel carries out principles and methods.As shown in fig. 7, human-computer interaction module possesses
" DSC+ drivers+touch-screen " tertiary structure, with DSC grades of ARM microprocessor as control core, completes at the concentration of Various types of data
Reason；Build the graphic control panel driver chip of function of hardware acceleration using Inner, reduce data transmission period and DSC microprocessors
Resource occupation, the high-velocity scanning and stabilization for realizing touch-screen characters/graphic shows；Simultaneously using technical grade liquid crystal touch screen TFT-
LCD is human-computer interaction interface, realizes intuitively presentation of information and interaction.Also there is human-computer interaction module abundant peripheral communication to connect
Mouthful, including RS-232/485, SSI, CAN etc., the data communication of various ways can be carried out with miscellaneous equipment；Human-computer interaction module
SD card interface and USB interface are extended, the storage and exchange of data can be conveniently realized；Human-computer interaction module also have carry
ADC modular converters, the electric current that comes from the output of electric signal real-time detection module can be directly received and voltage signal and carried out
It has been shown that, without from controller transfer, therefore the real-time of dynamic display of information can be stronger.
During using the present invention, three-phase/single phase industrial frequence alternating current by after electromagnetic compatibility module, industrial frequency rectifying filtration module into
It is smooth direct current electricity；Then the ac square wave impulse waveform of high-frequency/ultrahigh frequency is converted into after inflow WBG high frequency change of current modules；Through
The low-voltage high-frequency square-wave pulse signal that high-frequency power transformer is transformed into suitable welding procedure demand is crossed, electrical isolation and work(is realized
Rate is transmitted；Filtering high-frequency rectifier module is finally flowed into, the DC waveform of low-voltage, high-current is obtained.Controller examines electric signal in real time
The welding parameter that load current, voltage signal and the human-computer interaction module that survey module is detected give is compared, and by default
Control algolithm processed after produce needed for pwm signal, the signal isolated by WBG high-frequency drives with protection module/
Power amplification goes to control turning on and off for WBG power devices, so that the voltage waveform of main circuit is by WBG high frequency change of current moulds
High-frequency high-voltage is converted into after block, closed-loop control is realized.Power-frequency voltage value, the WBG of fault diagnosis module detection exchange input
Power device temperature rise and the temperature rise of high-frequency power transformer, while electric signal real-time detection module detection high-frequency power transformer
Primary side transient peak electric current, and the signal for detecting is conveyed to controller and WBG high-frequency drives and protection module respectively, once
There is the protection act for being input into the phenomenons such as over-pressed, under-voltage, overheat or output overcurrent, overvoltage, WBG high-frequency drives and protection module
Enable, close pwm signal so as to close the open-minded of WBG power devices, it is ensured that the safety of main circuit.
Embodiment two
The present embodiment high power density high efficiency WBG arc welding inverters, the difference with embodiment one is：The present embodiment
In, connected by soft start circuit module between industrial frequency rectifying filtration module and WBG high frequency change of current modules；Soft start circuit module
Also it is connected with controller, as shown in Figure 8 and Figure 9.Soft start circuit module include clocked flip-flop U201, relay RLY201,
Relay RLY202 and current-limiting resistance R201, and other peripheral auxiliary circuits.
When power supply electrifying, three-phase/single phase ac input starts to electricity by rectifier bridge and high-power current-limiting resistance R201
Solution electric capacity is charged；Meanwhile, control panel power supply signal VCC starts to fill timing capacitor C207 by timing resistor R211
Electricity, by after of short duration time delay, the 2 pin voltages of clocked flip-flop U201 are less than threshold voltage VCC/2, now 3 pin output high level
Signal, triode Q201 begins to turn on, and relay RLY201 and relay RLY202 action closures, current-limiting resistance R201 is other
Road, the direct current signal after rectification continues to charge and be slowly reached its rated value to electrochemical capacitor, and power supply now starts normal work
Make.RC elements primarily serve time-lag action in soft starting circuit, and constitute monostable trigger electricity with reference to clocked flip-flop U201
Road, further increases the reliability and stability of relay, it is ensured that the circuit can more effectively suppress surge current, prevent it
Power supply is impacted.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (7)
1. a kind of high power density high efficiency WBG arc welding inverters, it is characterised in that：Including main circuit and closed control circuit；
The main circuit includes the electromagnetic compatibility module, industrial frequency rectifying filtration module, WBG high frequency changes of current module, the high frequency work(that are sequentially connected
Rate transformer and filtering high-frequency rectifier module；Wherein, the external three-phase of electromagnetic compatibility module/single phase ac input power, high frequency is whole
The stream external arc load of filtration module；
The closed control circuit include electric signal real-time detection module, human-computer interaction module, fault diagnosis module, controller and
WBG high-frequency drives and protection module；
The WBG high-frequency drives are examined in real time with WBG high frequency changes of current module, fault diagnosis module, electric signal respectively with protection module
Survey module and controller connection；The fault diagnosis module also respectively with three-phase/single phase ac input power, the WBG high frequency changes of current
The connection of module, high-frequency power transformer and controller；The electric signal real-time detection module also respectively with high-frequency power transformer,
The connection of arc load, controller and human-computer interaction module；The human-computer interaction module is also connected with controller.
2. high power density high efficiency WBG arc welding inverters according to claim 1, it is characterised in that：The WGB high frequencies
Change of current module includes WBG power device Q1, WBG power device Q2, WBG power device Q3, WBG power devices Q4, the pole of afterflow two
Pipe D7, sustained diode 8, sustained diode 9, sustained diode 10, electric capacity C12, electric capacity C13, electric capacity C14, electric capacity C15,
Electric capacity C16 and inductance Lr；The high-frequency power transformer includes inductance Lm and transformer T1；The filtering high-frequency rectifier module bag
Include WBG power rectification pipe DR1, WBG power rectification pipes DR2, inductance Lo and electric capacity C17；
The industrial frequency rectifying filtration module is in parallel with the series circuit that WBG power device Q1 and WBG power devices Q3 is constituted, and
It is in parallel with the series circuit that WBG power device Q2 and WBG power devices Q4 is constituted；Sustained diode 7 and electric capacity C12 difference are simultaneously
It is associated on WBG power devices Q1；Sustained diode 8 and electric capacity C13 are connected in parallel on WBG power devices Q2 respectively；Fly-wheel diode
D9 and electric capacity C14 are connected in parallel on WBG power devices Q3 respectively；Sustained diode 10 and electric capacity C15 are connected in parallel on WBG power respectively
On device Q4；The tie point of WBG power device Q1 and WBG power devices Q3 is with WBG power device Q2 and WBG power devices Q's
Connected by transformer T1 primary, electric capacity C16 and inductance Lr between tie point；Inductance Lm is connected in parallel in transformer T1 primary；Become
First output end of T1 level of depressor by WBG power rectification pipes DR1, T1 level of inductance Lo and electric capacity C17 and transformer the
Two output ends are connected；And the tie point of WBG power rectification pipe DR1 and inductance Lo passes through WBG power rectification pipe DR2 and transformer
T1 the 3rd output end connection of level；The arc load is in parallel with electric capacity C17.
3. high power density high efficiency WBG arc welding inverters according to claim 1, it is characterised in that：The WBG high frequencies
Drive includes system-level malfunction detection process circuit, power stage fault detect process circuit, the inspection of device level failure with protection module
Survey process circuit, drive pattern selection circuit, fault type output circuit, two-way magnetic field impulse isolation and transmission circuit, signal logic
Process circuit, signal conversion interface circuit, signal reconstruction circuit, power amplifier circuit and high frequency high isolation type DC/DC power electricity
Road；
The two-way magnetic field impulse isolation and transmission circuit respectively with signal logic process circuit, device level fault detect process circuit and
Signal reconstruction circuit two-way signaling is connected；System level fault detect process circuit, drive pattern selection circuit, fault type are defeated
Go out circuit and signal conversion interface circuit to be connected with signal logic process circuit respectively；Two-way magnetic field impulse isolation and transmission circuit passes through
Signal reconstruction circuit is connected with power amplifier circuit；Device level fault detect process circuit is connected with power amplifier circuit.
4. high power density high efficiency WBG arc welding inverters according to claim 1, it is characterised in that：The electric signal
Real-time detection module include high-frequency power transformer primary current high speed and precision rectification circuit, arc load current detection circuit and
Arc load voltage real-time detection circuit.
5. high power density high efficiency WBG arc welding inverters according to claim 1, it is characterised in that：The failure is examined
Disconnected module includes input overvoltage/under-voltage diagnostic circuit and overheat diagnostic circuit.
6. high power density high efficiency WBG arc welding inverters according to claim 1, it is characterised in that：The power frequency is whole
Connected by soft start circuit module between stream filtration module and WBG high frequency change of current modules；The soft start circuit module also with
Controller is connected.
7. high power density high efficiency WBG arc welding inverters according to claim 6, it is characterised in that：The soft start
Circuit module includes clocked flip-flop U201, relay RLY201, relay RLY202 and current-limiting resistance R201, and outside other
Enclose auxiliary circuit.
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| CN106735740B (en) | 2018-06-19 |
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