CN108183619A - A kind of high powered plasma cutting power supply - Google Patents
A kind of high powered plasma cutting power supply Download PDFInfo
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- CN108183619A CN108183619A CN201810111345.2A CN201810111345A CN108183619A CN 108183619 A CN108183619 A CN 108183619A CN 201810111345 A CN201810111345 A CN 201810111345A CN 108183619 A CN108183619 A CN 108183619A
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- 230000005611 electricity Effects 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
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- 238000011084 recovery Methods 0.000 claims description 3
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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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
- B23K10/00—Welding or cutting by means of a plasma
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
- H05H1/36—Circuit arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Plasma Technology (AREA)
Abstract
The present invention provides a kind of high powered plasma cutting power supply, including step-down transformer, the first rectifier, the second rectifier, the first chopper, the second chopper, output filtering, controller, driving circuit, current foldback circuit, high-frequency and high-voltage arc ignition circuit, transformer thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal.The present invention use Industrial Frequency Transformer by the 380VAC three-phase alternating currents of power grid through three-phase transformer isolated buck for two-way three-phase 200V alternating currents, again chopper is supplied for direct current through three-phase bridge rectification and capacitor filtering, chopper is in parallel for two Buck converter modules, direct current is switched to the high-frequency electrical pulses of 15.5kHz by chopper, and stable DC current supply arc cutting is exported after output filters；Have the advantages that control circuit is simple, switching frequency is high, control characteristic is good, reliability is high, at low cost.
Description
Technical field
The present invention relates to cutting machine power technique fields, and in particular to a kind of high powered plasma cutting power supply.
Background technology
With in mechanical manufacturing technology " weld Dai Zhu " trend acceleration, people to the concern sight of plasma cut
Cutting sheet metal and nonferrous metal are not limited solely to, is more the processing system for meeting high speed, high quality, low cost with it
Make the demand of the middle thick carbon steel plate cutting of dosage maximum in industry.At a time when water jet plasma cutting technique, longevity in the world at this time
Oxygen plasma cutting technique and fine plasma cutting technique birth and mature in succession are ordered, gives digital controlled air in time
Plasma cutting machine manufacturer is with technical powerful support.The active demand of exterior market, in addition the day of inherent technique preparation
Attain perfect, facilitate CNC plasma cutting and be widely used in many fields, as it is applied in automobile, machine
The all trades and professions such as vehicle, pressure vessel, chemical machinery, nuclear industry, universal machine, engineering machinery, steel construction.Plasma cut is profit
The metal at place to be cut is melted rapidly with the high temperature of plasma arc, while by the huge impulse force handle fusing of high speed plasma jet
Metal blow down, so as to form notch and workpiece is cut open, therefore be a kind of melt cut method using electric energy.Plasma
Arc column temperature is high, usually up to 18000-24000K, considerably beyond all metals and nonmetallic fusing point, can cut any black
Color and non-ferrous metal and nonmetallic materials, it is applied widely.
Core of the plasma cutting power supply as plasma cutting machine, generally using DC power supply, according to plasma arc
It needs, there is following basic demand to power supply：(1) there is the external characteristics dropped suddenly.Under the static characteristic of plasma arc is in low current
Drop characteristic is horizontal nature in generally common current range, and when high current is rising characteristic.It is this non-linear for plasma arc
Load, according to the power supply of flat hard constant pressure external characteristic curve, otherwise the horizontal transfer curve with plasma arc is all heavy
It closes or without intersection point, therefore is not not cause electric arc, exactly cause electric current very big, power supply is burnt；With plasma arc rise or
Though decline intersection point there are one shape transfer curves, only a theoretical operating point, during actual use or cannot stablize
Work still can not meet technologic requirement.In addition, when carrying out plasma cutting process, the anode spot of plasma-arc
Point, by along the duct of the thickness of workpiece or nozzle, frequently travelling up and down, therefore arc length is also with continually changing,
The variation that the variation of arc length will cause electric current, the source current variation with dropping characteristic are minimum.(2) ignite main arc when,
Electric current rises cannot be too fast.(3) high floating voltage is required.In order to ensure that plasma arc has enough compressions, to form height
The flame stream of warm high speed is conducive to the penetration power of cutting and blows away slag, and this requires larger working air currents, there is larger flame stream
Length and higher electric field strength, these can all greatly improve operating voltage, and operating voltage improves inevitable requirement floating voltage
It is corresponding to improve, and floating voltage is high, is conducive to striking and the operation is stable, improves cut quality.
Contravariant plasma cutting power supply is due to a part of the high frequency transformer distributed constant as resonance circuit, transformer
Leakage inductance participates in resonance, and the output power of leakage inductance too conference limiting transformer influences resonant frequency and increases the voltage of switching tube
The problem of stress damages semiconductor devices, thus high there are repair rate, and reliability is low is typically employed in the occasion of below 20kW.
Invention content
(1) the technical issues of solving
The present invention provides a kind of high powered plasma for defect problem existing for above-mentioned high powered plasma cutting power supply
Cutting power supply, use Industrial Frequency Transformer by the 380VAC three-phase alternating currents of power grid through three-phase transformer isolated buck for two-way three-phase
200V alternating currents, then chopper is supplied for direct current through three-phase bridge rectification and capacitor filtering, chopper is two Buck converters
Direct current is switched to the high-frequency electrical pulses of 15.5kHz by wired in parallel, chopper, and stable direct current is exported after output filters
Stream supply arc cutting；Have the advantages that control circuit is simple, switching frequency is high, control characteristic is good, reliability is high, at low cost,
It is the ideal chose of current high power air plasma cutting power supply.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of high powered plasma cutting power supply is cut including step-down transformer, the first rectifier, the second rectifier, first
Wave device, the second chopper, output filtering, controller, driving circuit, current foldback circuit, high-frequency and high-voltage arc ignition circuit, transformer
Thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal；Step-down transformer input terminal and power grid
It is connected, the output terminal of step-down transformer is connected respectively with the first rectifier, the second rectifier input；First rectifier output end
It is connected with the first chopper input terminal, the second rectifier output end is connected with the second chopper input terminal, the first chopper, second
The output terminal of chopper is connected respectively with output filtering；Driving circuit, current foldback circuit, high-frequency and high-voltage arc ignition circuit, transformation
The peripheral circuit point of device thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal device in order to control
It is not connected with controller；The output terminal of driving circuit is connected respectively with the first chopper, the second chopper, current foldback circuit,
High-frequency and high-voltage arc ignition circuit is connected respectively with output filtering, and transformer thermal-shutdown circuit is connected with step-down transformer.
An embodiment according to the present invention, the step-down transformer secondary are set there are two winding, and two vice-side windings are distinguished
It is connected with the first rectifier and the input of the second rectifier, first rectifier, the second rectifier are triphase silicon rectification bridge module；
First chopper, the second chopper are the first BUCK circuits, the 2nd BUCK circuits, and the first BUCK circuits include crystal
Pipe Q1, capacitance C11, fly-wheel diode VD1, inductance Lm1, the emitter of transistor Q1 are connected with capacitance C11 one end, transistor Q1
Collector be connected with fly-wheel diode VD1 anodes, fly-wheel diode VD1 cathodes respectively with the capacitance C11 other ends, inductance Lm1
One end is connected；The 2nd BUCK circuits include transistor Q2, capacitance C12, fly-wheel diode VD2, inductance Lm2, transistor Q2
Emitter be connected with capacitance C12 one end, the collector of transistor Q2 is connected with fly-wheel diode VD2 anodes, fly-wheel diode
VD2 cathodes are connected respectively with the capacitance C12 other ends, inductance Lm2 one end；Inductance Lm1, the inductance Lm2 other ends are filtered respectively with output
Wave is connected.
The decompression of power grid three-phase 380V alternating currents is two-way three-phase by an embodiment according to the present invention, the step-down transformer
200V alternating currents.
An embodiment according to the present invention, first rectifier, the second rectifier are triphase silicon rectification bridge module
DF100AA120。
An embodiment according to the present invention, described fly-wheel diode VD1, VD2 be fast recovery diode, the transistor
Q1, Q2 are switching tube IGBT.
An embodiment according to the present invention, the controller are microcontroller PIC16F877.
An embodiment according to the present invention, the driving circuit include driving chip U1, resistance R1, R2, R3, R4, R5,
R6, R7, R8, R9, R10, capacitance C1, C2, C3, C4, diode D1, D2, the driving chip U1 are SG3526, duty cycle signals
It is connected by resistance R1 with 1 foot of U1,1 foot of U1 is also connected with resistance R6, R7, capacitance C1 one end respectively, resistance R7, capacitance C1
The other end is grounded, and resistance R6 is connected with 18 feet of U1；2 feet of U1 are connected respectively with resistance R2, capacitance C3 one end, resistance R2, electricity
Hold C3 other ends ground connection, 3 feet of U1 are connected with 2 feet, and 4 feet of U1 are grounded by capacitance C2,6 feet of U1 and 7 feet ground connection；The 9 of U1
Foot is connected with resistance R4 one end, and the resistance R4 other ends are connected with resistance R3 one end, and resistance R3 other ends ground connection, 10 feet of U1 pass through
Capacitance C4 is grounded；11 feet of U1 are grounded by resistance R5, and 12 feet of U1 are connected by resistance R8 with 18 feet of U1；13 feet of U1 with
The anode of diode D1 is connected, and the cathode of diode D1 is connected with the first chopper, 16 feet of U1 and the anode phase of diode D2
Even, the cathode of diode D2 is connected with the second chopper.
An embodiment according to the present invention, the current foldback circuit include resistance R11, R12, R13, R14, R15, R16,
Operational amplifier U2, U3, capacitance C5, C6, C7, the in-phase input end of diode D3, the operational amplifier U2 respectively with resistance
R11, capacitance C5 one end are connected, and capacitance C5 other ends ground connection, the inverting input of operational amplifier U2 is connected with output terminal, operation
The output terminal of amplifier U2 is connected by resistance R14 with the inverting input of operational amplifier U3, the same phase of operational amplifier U3
Input terminal is connected respectively with resistance R12, R13, capacitance C6 one end, resistance R12, capacitance C6 other ends ground connection, the resistance R12 other ends
Be connected with reference voltage Vref, resistance R5 is connected between the inverting input and output terminal of operational amplifier U3, resistance R16 with
Resistance R5 both ends are connected in parallel on after capacitance C7 series connection, the output terminal of operational amplifier U3 is connected with the cathode of diode D3, diode
The anode of D3 is connected with controller.
An embodiment according to the present invention, the high-frequency and high-voltage arc ignition circuit include AC power, step-up transformer T2, whole
Flow diode D4, D5, D6, D7, filter capacitor C8, switching tube VT1, VT2, VT3, VT4, isolating transformer T3, diode D8, institute
It states AC power with step-up transformer T2 primary sides to be connected, secondary one end and diode D4 anodes, the diode of step-up transformer T2
D6 cathodes are connected, and the secondary other end of step-up transformer T2 is connected with diode D5 anodes, diode D7 cathodes, and diode D4 is cloudy
Pole, diode D5 cathodes are connected, diode D6 cathodes, diode D7 plus earths, capacitance C8 be connected in parallel on diode D5 cathodes with
Between ground；Described switching tube VT1, VT2, VT3, VT4 form inverter bridge, and switching tube VT1, VT2 collector is connected, switching tube VT1
Emitter be connected with the collector of switching tube VT3, the emitter of switching tube VT2 is connected with the collector of switching tube VT4, switch
The emitter of pipe VT3 and switching tube VT4 are grounded, the emitter of switching tube VT1, VT2 respectively with the primary side phase of isolating transformer T3
Even, the secondary of isolating transformer T3 is connected with diode D8 anodes, and the cathode of diode D8 is connected with output filtering.
An embodiment according to the present invention, the transformer thermal-shutdown circuit include thermistor RT, resistance R17,
R18, R19, R20, R21, capacitance C9, C10, operational amplifier U4, described thermistor RT one end and resistance R17, R18 one end phase
Even, thermistor RT other ends ground connection, the resistance R17 other ends are connected with positive 5V power supplys, the resistance R18 other ends and operational amplifier
The in-phase input end of U4 is connected, and the in-phase input end of operational amplifier U4 is also grounded by capacitance C9, and operational amplifier U4's is anti-
Phase input terminal is connected respectively with resistance R20, capacitance C10 one end, capacitance C10 other ends ground connection, the resistance R20 other ends and resistance
R19 one end is connected, and the resistance R19 other ends are connected with positive 5V power supplys, and the output terminal of operational amplifier U4 passes through resistance R21 and positive 5V
Power supply is connected.
(3) advantageous effect
Beneficial effects of the present invention：A kind of high powered plasma cutting power supply, using Industrial Frequency Transformer by power grid
380VAC three-phase alternating currents are two-way three-phase 200V alternating currents through three-phase transformer isolated buck, then through three-phase bridge rectification and capacitance
Direct current supply chopper is filtered into, chopper is in parallel for two Buck converter modules, and chopper switches to direct current
The high-frequency electrical pulses of 15.5kHz export stable DC current supply arc cutting after output filters；Become using two Buck
Parallel operation wired in parallel can replace Industrial Frequency Transformer, so as to make change by means of high-power electric and electronic switch and high frequency transformer
Depressor and reactor weight, volume, material are greatly reduced, and efficiency accordingly improves；With control circuit is simple, switching frequency
High, the advantages of control characteristic is good, reliability is high, at low cost.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is principle of the invention block diagram；
Fig. 2 is main circuit diagram；
Fig. 3 is driver circuit schematic diagram；
Fig. 4 is current foldback circuit schematic diagram；
Fig. 5 is high-frequency and high-voltage arc ignition circuit schematic diagram；
Fig. 6 is transformer thermal-shutdown circuit schematic diagram.
Reference sign：
1st, step-down transformer T1；2nd, the first rectifier；3rd, the second rectifier；4th, the first chopper；5th, the second chopper；6、
Output filtering.
Resistance Ro, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17,
R18, R19, R20, R21, thermistor RT, capacitance Co, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, two poles
Pipe D1, D2, D3, D4, D5, D6, D7, D8, VD1, VD2, driving chip U1, operational amplifier U2, U3, U4, the pipe Q1, Q2 that opens the light,
VT1, VT2, VT3, VT4, step-up transformer T2, isolating transformer T3, inductance Lm1, Lm2.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
With reference to Fig. 1, a kind of high powered plasma cutting power supply, including step-down transformer, the first rectifier, the second rectification
Device, the first chopper, the second chopper, output filtering, controller, driving circuit, current foldback circuit, high-frequency and high-voltage striking electricity
Road, transformer thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal.Step-down transformer is defeated
Enter end with power grid to be connected, the output terminal of step-down transformer is connected respectively with the first rectifier, the second rectifier input；First is whole
Stream device output terminal is connected with the first chopper input terminal, and the second rectifier output end is connected with the second chopper input terminal, and first
Chopper, the second chopper output terminal respectively with output filtering be connected；Driving circuit, current foldback circuit, high-frequency and high-voltage draw
Arc circuit, transformer thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal device in order to control
Peripheral circuit is connected respectively with controller；The output terminal of driving circuit is connected respectively with the first chopper, the second chopper, overcurrent
Protection circuit, high-frequency and high-voltage arc ignition circuit are connected respectively with output filtering, transformer thermal-shutdown circuit and step-down transformer phase
Even.
With reference to Fig. 2, it is whole that high powered plasma cutting power supply main circuit includes step-down transformer 1, the first rectifier 2, second
Flow device 3, the first chopper 4, the second chopper 5, output filtering 6.1 secondary of step-down transformer is set there are two winding, two secondary
Winding is connected respectively with the first rectifier 2 and the input of the second rectifier 3.First rectifier 2, the second rectifier 3 are whole for three-phase silicon
Flow bridge module, triphase silicon rectification bridge module DF100AA120.First chopper 4, the second chopper 5 are respectively the first BUCK electricity
Road, the 2nd BUCK circuits, the first BUCK circuits include transistor Q1, capacitance C11, fly-wheel diode VD1, inductance Lm1, transistor
The emitter of Q1 is connected with capacitance C11 one end, and the collector of transistor Q1 is connected with fly-wheel diode VD1 anodes, two pole of afterflow
Pipe VD1 cathodes are connected respectively with the capacitance C11 other ends, inductance Lm1 one end；2nd BUCK circuits include transistor Q2, capacitance
C12, fly-wheel diode VD2, inductance Lm2, the emitter of transistor Q2 are connected with capacitance C12 one end, the collector of transistor Q2
It is connected with fly-wheel diode VD2 anodes, fly-wheel diode VD2 cathodes are connected respectively with the capacitance C12 other ends, inductance Lm2 one end；
Inductance Lm1, the inductance Lm2 other ends are connected respectively with output filtering 6, and output filtering 6 includes filter capacitor Co and load resistance Ro,
Load resistance Ro is in parallel with filter capacitor Co.Step-down transformer hands over the decompression of power grid three-phase 380V alternating currents for two-way three-phase 200V
Galvanic electricity.Fly-wheel diode VD1, VD2 are fast recovery diode, and described transistor Q1, Q2 are switching tube IGBT.
Controller is microcontroller PIC16F877.High powered plasma cutting power supply using PIC16F877 microcontrollers as core,
Accurate closed-loop control in real time is carried out to entire power supply, the output current of power supply, microcontroller warp are controlled using pulse duration modulation method
D/A converter output current Setting signal after carrying out PID adjustings with the inductor current signal of current divider sampling, passes through pulsewidth tune
Coremaking piece SG3526 exports pwm pulse, then triggers IGBT after optocoupler drive module HCPL-3120 carries out power amplification, with reality
The output of existing power.
During specific works, the decompression of three-phase 380V alternating currents is two-way three-phase 200V alternating currents by step-down transformer T1, then by
Three-phase bridge commutating module and capacitor filtering become direct current.Direct current is switched to the high-frequency electrical pulses of 15.5kHz by chopper,
Stable DC current supply arc cutting is exported after output filters.It is in parallel using two Buck converter modules, in order to just
In the design of driving circuit, power tube is placed in low-pressure side, thus Buck converters are output and input not altogether, to make two
Module output-parallel, it is necessary to which the input of module is isolated.To meet cutting technique requirement and safety utilization of electric power needs, downconverter
On the one hand device commercial power is isolated with cutting body electricity consumption, also two chopper inputs are isolated, convenient for output-parallel；It is another
Commercial power is converted into the voltage class of system requirements by aspect, since rectifying and wave-filtering capacitance is larger, capacitor charging meeting during combined floodgate
Cause larger surge current, input transformer can inhibit surge current, therefore need not set input buffer circuit.
With reference to Fig. 3, driving circuit includes driving chip U1, resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, electricity
Hold C1, C2, C3, C4, diode D1, D2.Driving chip U1 be SG3526, the 1 foot phase that duty cycle signals pass through resistance R1 and U1
Even, 1 foot of U1 is also connected with resistance R6, R7, capacitance C1 one end respectively, resistance R7, capacitance C1 other ends ground connection, resistance R6 and U1
18 feet be connected；2 feet of U1 are connected respectively with resistance R2, capacitance C3 one end, resistance R2, capacitance C3 other ends ground connection, 3 feet of U1
It is connected with 2 feet, 4 feet of U1 are grounded by capacitance C2,6 feet of U1 and 7 feet ground connection；9 feet of U1 are connected with resistance R4 one end, resistance
The R4 other ends are connected with resistance R3 one end, and resistance R3 other ends ground connection, 10 feet of U1 are grounded by capacitance C4；11 feet of U1 pass through
Resistance R5 is grounded, and 12 feet of U1 are connected by resistance R8 with 18 feet of U1；13 feet of U1 are connected with the anode of diode D1, two poles
The cathode of pipe D1 is connected with the first chopper, and 16 feet of U1 are connected with the anode of diode D2, the cathode of diode D2 and second
Chopper is connected.
Pulse-width modulation circuit uses SG3526, it is a kind of integrated electricity of pulse width modulation with recommending output mode
Road, SG3526 by reference voltage, oscillator, error amplifier, comparator, trigger, latch, phase-splitter, output stage and
The circuits such as under-voltage locking, soft start, synchronization, reset, shutdown form.Its working power voltage：8.0~35V；Export collector electricity
Source voltage：4.5V-35V；Two-way source sucking/output current：100mA；Reference power supply output voltage：5.0V, load current：
20mA；Frequency of oscillation：1-400kHz, oscillator resistor range：2k Ω~150k Ω, oscillating capacitance range 1nF-20nF；40kHz
Dead time 3%-50% is controllable；Temperature range：-65℃-150℃；With digital current limliting, under-voltage protection, programmable soft open
Setting of dynamic and idle time etc..
During specific works, input voltage and feedback voltage are connected on error amplifier with, inverting input respectively, through amplification
Afterwards, error control voltage is added to comparator in-phase input end, and the sawtooth signal that oscillator generates is added in comparator anti-phase input
End.When error control voltage is more than sawtooth signal, comparator output high level, on the contrary output low level.Comparator exports
Square-wave signal frequency it is identical with sawtooth wave frequency rate, and square wave pulse width is with input voltage size variation.Pulse signal is by touching
After sending out device split-phase, the pwm signal that two-way phase differs 180 ° is generated, using the power amplification circuit that transistor forms, from 13,
16 feet export.The pulse width of the size control output waveform of 3 voltage error of pin control voltage, also just controls inductive current
Average value.Error control voltage is higher, and pulsewidth is wider, conversely, error control voltage is lower, pulsewidth is narrower.
With reference to Fig. 4, current foldback circuit includes resistance R11, R12, R13, R14, R15, R16, operational amplifier U2, U3,
Capacitance C5, C6, C7, diode D3.The in-phase input end of operational amplifier U2 is connected respectively with resistance R11, capacitance C5 one end, electricity
Hold C5 other ends ground connection, the inverting input of operational amplifier U2 is connected with output terminal, and the output terminal of operational amplifier U2 passes through
Resistance R14 is connected with the inverting input of operational amplifier U3, the in-phase input end of operational amplifier U3 respectively with resistance R12,
R13, capacitance C6 one end are connected, and resistance R12, capacitance C6 other ends ground connection, the resistance R12 other ends are connected with reference voltage Vref,
Resistance R5 is connected between the inverting input and output terminal of operational amplifier U3, and resistance R16 is connected in parallel on after connecting with capacitance C7
Resistance R5 both ends, the output terminal of operational amplifier U3 are connected with the cathode of diode D3, anode and the controller phase of diode D3
Even.Operational amplifier U2, U3 can be LM339.
When over-current phenomenon avoidance does not occur, operational amplifier U3 output terminals are high level, due to diode D3 unilateral conductions,
The output signal of current foldback circuit not may be output to controller.When over-current phenomenon avoidance occurs, the output terminal of operational amplifier U3
For low level, diode D3 conductings, current foldback circuit exports low level signal to controller.
With reference to Fig. 5, high-frequency and high-voltage arc ignition circuit include AC power, step-up transformer T2, rectifier diode D4, D5, D6,
D7, filter capacitor C8, switching tube VT1, VT2, VT3, VT4, isolating transformer T3, diode D8.AC power and boosting transformation
Device T2 primary sides are connected, and secondary one end of step-up transformer T2 is connected with diode D4 anodes, diode D6 cathodes, step-up transformer
The secondary other end of T2 is connected with diode D5 anodes, diode D7 cathodes, and diode D4 cathodes, diode D5 cathodes are connected,
Diode D6 cathodes, diode D7 plus earths, capacitance C8 are connected in parallel between diode D5 cathodes and ground；Switching tube VT1, VT2,
VT3, VT4 form inverter bridge, and switching tube VT1, VT2 collector is connected, the emitter of switching tube VT1 and the current collection of switching tube VT3
Extremely it is connected, the emitter of switching tube VT2 is connected with the collector of switching tube VT4, the emitter of switching tube VT3 and switching tube VT4
Ground connection, the primary side of the emitter of switching tube VT1, VT2 respectively with isolating transformer T3 are connected, the secondary of isolating transformer T3 and two
Pole pipe D8 anodes are connected, and the cathode of diode D8 is connected with output filtering.
With reference to Fig. 6, transformer thermal-shutdown circuit includes thermistor RT, resistance R17, R18, R19, R20, R21, capacitance
C9, C10, operational amplifier U4.Thermistor RT one end is connected with resistance R17, R18 one end, thermistor RT other ends ground connection,
The resistance R17 other ends are connected with positive 5V power supplys, and the resistance R18 other ends are connected with the in-phase input end of operational amplifier U4, operation
The in-phase input end of amplifier U4 is also grounded by capacitance C9, the inverting input of operational amplifier U4 respectively with resistance R20, electricity
Hold C10 one end to be connected, capacitance C10 other ends ground connection, the resistance R20 other ends are connected with resistance R19 one end, the resistance R19 other ends
It is connected with positive 5V power supplys, the output terminal of operational amplifier U4 is connected by resistance R21 with positive 5V power supplys.Operational amplifier U4 can be with
It is LM339.
When there is not excess temperature phenomenon in transformer, operational amplifier U4 output terminals output low level；When transformer occurs
During the excessively high phenomenon of temperature, the raising of thermistor RT resistance values, the homophase input terminal voltage raising of operational amplifier U4, operational amplifier
High level is exported to controller.
In conclusion the embodiment of the present invention, high powered plasma cutting power supply, using Industrial Frequency Transformer by power grid
380VAC three-phase alternating currents are two-way three-phase 200V alternating currents through three-phase transformer isolated buck, then through three-phase bridge rectification and capacitance
Direct current supply chopper is filtered into, chopper is in parallel for two Buck converter modules, and chopper switches to direct current
The high-frequency electrical pulses of 15.5kHz export stable DC current supply arc cutting after output filters；Become using two Buck
Parallel operation wired in parallel can replace Industrial Frequency Transformer, so as to make change by means of high-power electric and electronic switch and high frequency transformer
Depressor and reactor weight, volume, material are greatly reduced, and efficiency accordingly improves；With control circuit is simple, switching frequency
High, the advantages of control characteristic is good, reliability is high, at low cost.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example modifies or carries out equivalent replacement to which part technical characteristic；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of high powered plasma cutting power supply, it is characterised in that：Including step-down transformer, the first rectifier, the second rectification
Device, the first chopper, the second chopper, output filtering, controller, driving circuit, current foldback circuit, high-frequency and high-voltage striking electricity
Road, transformer thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal；Step-down transformer is defeated
Enter end with power grid to be connected, the output terminal of step-down transformer is connected respectively with the first rectifier, the second rectifier input；First is whole
Stream device output terminal is connected with the first chopper input terminal, and the second rectifier output end is connected with the second chopper input terminal, and first
Chopper, the second chopper output terminal respectively with output filtering be connected；Driving circuit, current foldback circuit, high-frequency and high-voltage draw
Arc circuit, transformer thermal-shutdown circuit, man-machine interface, alarm, water route fault-signal, gas path failure signal device in order to control
Peripheral circuit is connected respectively with controller；The output terminal of driving circuit is connected respectively with the first chopper, the second chopper, overcurrent
Protection circuit, high-frequency and high-voltage arc ignition circuit are connected respectively with output filtering, transformer thermal-shutdown circuit and step-down transformer phase
Even.
A kind of 2. high powered plasma cutting power supply as described in claim 1, which is characterized in that the step-down transformer secondary
If there are two winding, two vice-side windings are connected respectively with the first rectifier and the input of the second rectifier, first rectifier,
Second rectifier is triphase silicon rectification bridge module；First chopper, the second chopper are the first BUCK circuits, the 2nd BUCK
Circuit, the first BUCK circuits include transistor Q1, capacitance C11, fly-wheel diode VD1, inductance Lm1, the hair of transistor Q1
Emitter-base bandgap grading is connected with capacitance C11 one end, and the collector of transistor Q1 is connected with fly-wheel diode VD1 anodes, and fly-wheel diode VD1 is cloudy
Pole is connected respectively with the capacitance C11 other ends, inductance Lm1 one end；The 2nd BUCK circuits include transistor Q2, capacitance C12, continue
Flow diode VD2, the emitter of inductance Lm2, transistor Q2 are connected with capacitance C12 one end, the collector of transistor Q2 and afterflow
Diode VD2 anodes are connected, and fly-wheel diode VD2 cathodes are connected respectively with the capacitance C12 other ends, inductance Lm2 one end；Inductance
Lm1, the inductance Lm2 other ends are connected respectively with output filtering.
3. a kind of high powered plasma cutting power supply as claimed in claim 2, which is characterized in that the step-down transformer will be electric
The decompression of net three-phase 380V alternating currents is two-way three-phase 200V alternating currents.
4. a kind of high powered plasma cutting power supply as claimed in claim 3, which is characterized in that first rectifier, the
Two rectifiers are triphase silicon rectification bridge module DF100AA120.
5. a kind of high powered plasma cutting power supply as claimed in claim 4, which is characterized in that the fly-wheel diode VD1,
VD2 is fast recovery diode, and described transistor Q1, Q2 are switching tube IGBT.
6. a kind of high powered plasma cutting power supply as described in claim 1, which is characterized in that the controller is microcontroller
PIC16F877。
7. a kind of high powered plasma cutting power supply as described in claim 1, which is characterized in that the driving circuit includes driving
Dynamic chip U1, resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitance C1, C2, C3, C4, diode D1, D2 are described
Driving chip U1 is SG3526, and duty cycle signals are connected by resistance R1 with 1 foot of U1,1 foot of U1 also respectively with resistance R6,
R7, capacitance C1 one end are connected, and resistance R7, capacitance C1 other ends ground connection, resistance R6 are connected with 18 feet of U1；2 feet of U1 respectively with
Resistance R2, capacitance C3 one end are connected, and resistance R2, capacitance C3 other ends ground connection, 3 feet of U1 are connected with 2 feet, and 4 feet of U1 pass through electricity
Hold C2 ground connection, 6 feet of U1 and 7 feet ground connection；9 feet of U1 are connected with resistance R4 one end, the resistance R4 other ends and resistance R3 one end phase
Even, resistance R3 other ends ground connection, 10 feet of U1 are grounded by capacitance C4；11 feet of U1 are grounded by resistance R5, and 12 feet of U1 lead to
Resistance R8 is crossed with 18 feet of U1 to be connected；13 feet of U1 are connected with the anode of diode D1, the cathode of diode D1 and the first copped wave
Device is connected, and 16 feet of U1 are connected with the anode of diode D2, and the cathode of diode D2 is connected with the second chopper.
A kind of 8. high powered plasma cutting power supply as described in claim 1, which is characterized in that the current foldback circuit packet
Include resistance R11, R12, R13, R14, R15, R16, operational amplifier U2, U3, capacitance C5, C6, C7, diode D3, the operation
The in-phase input end of amplifier U2 is connected respectively with resistance R11, capacitance C5 one end, capacitance C5 other ends ground connection, operational amplifier
The inverting input of U2 is connected with output terminal, and the output terminal of operational amplifier U2 passes through the anti-of resistance R14 and operational amplifier U3
Phase input terminal is connected, and the in-phase input end of operational amplifier U3 is connected respectively with resistance R12, R13, capacitance C6 one end, resistance
R12, capacitance C6 other ends ground connection, the resistance R12 other ends are connected with reference voltage Vref, and resistance R5 is connected to operational amplifier U3
Inverting input and output terminal between, resistance R16 is connected in parallel on resistance R5 both ends after connecting with capacitance C7, operational amplifier U3's
Output terminal is connected with the cathode of diode D3, and the anode of diode D3 is connected with controller.
A kind of 9. high powered plasma cutting power supply as described in claim 1, which is characterized in that the high-frequency and high-voltage striking electricity
Road include AC power, step-up transformer T2, rectifier diode D4, D5, D6, D7, filter capacitor C8, switching tube VT1, VT2,
VT3, VT4, isolating transformer T3, diode D8, the AC power are connected with step-up transformer T2 primary sides, step-up transformer T2
Secondary one end be connected with diode D4 anodes, diode D6 cathodes, the secondary other end of step-up transformer T2 and diode D5
Anode, diode D7 cathodes are connected, and diode D4 cathodes, diode D5 cathodes are connected, diode D6 cathodes, diode D7 anodes
Ground connection, capacitance C8 are connected in parallel between diode D5 cathodes and ground；Described switching tube VT1, VT2, VT3, VT4 form inverter bridge, open
It closes pipe VT1, VT2 collector to be connected, the emitter of switching tube VT1 is connected with the collector of switching tube VT3, the hair of switching tube VT2
Emitter-base bandgap grading is connected with the collector of switching tube VT4, the emitter ground connection of switching tube VT3 and switching tube VT4, switching tube VT1, VT2's
Primary side of the emitter respectively with isolating transformer T3 is connected, and the secondary of isolating transformer T3 is connected with diode D8 anodes, two poles
The cathode of pipe D8 is connected with output filtering.
10. a kind of high powered plasma cutting power supply as described in claim 1, which is characterized in that the transformer excess temperature is protected
Protection circuit includes thermistor RT, resistance R17, R18, R19, R20, R21, capacitance C9, C10, operational amplifier U4, the temperature-sensitive
Resistance RT one end is connected with resistance R17, R18 one end, thermistor RT other ends ground connection, the resistance R17 other ends and positive 5V power supplys
It is connected, the resistance R18 other ends are connected with the in-phase input end of operational amplifier U4, and the in-phase input end of operational amplifier U4 is also logical
Capacitance C9 ground connection is crossed, the inverting input of operational amplifier U4 is connected respectively with resistance R20, capacitance C10 one end, and capacitance C10 is another
One end is grounded, and the resistance R20 other ends are connected with resistance R19 one end, and the resistance R19 other ends are connected with positive 5V power supplys, operation amplifier
The output terminal of device U4 is connected by resistance R21 with positive 5V power supplys.
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| CN201810111345.2A CN108183619A (en) | 2018-02-05 | 2018-02-05 | A kind of high powered plasma cutting power supply |
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| CN201810111345.2A CN108183619A (en) | 2018-02-05 | 2018-02-05 | A kind of high powered plasma cutting power supply |
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| CN110337167A (en) * | 2019-07-03 | 2019-10-15 | 昆山书豪仪器科技有限公司 | A kind of arc discharge light source |
| CN111865111A (en) * | 2020-07-22 | 2020-10-30 | 新风光电子科技股份有限公司 | High-power AC/DC conversion plasma igniter driving circuit and method |
| CN115514070A (en) * | 2022-09-26 | 2022-12-23 | 深圳易能电科技有限公司 | Efficient charging circuit and charging device using same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110337167A (en) * | 2019-07-03 | 2019-10-15 | 昆山书豪仪器科技有限公司 | A kind of arc discharge light source |
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