CN102079002A - Inverter welding and cutting machine with dual-voltage system - Google Patents
Inverter welding and cutting machine with dual-voltage system Download PDFInfo
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- CN102079002A CN102079002A CN201110027728XA CN201110027728A CN102079002A CN 102079002 A CN102079002 A CN 102079002A CN 201110027728X A CN201110027728X A CN 201110027728XA CN 201110027728 A CN201110027728 A CN 201110027728A CN 102079002 A CN102079002 A CN 102079002A
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Abstract
The invention discloses an inverter welding and cutting machine with a dual-voltage system which comprises an input switch circuit, a primary side rectification filter circuit, an inverter circuit, an isolation transformer with a tap, a secondary side rectification filter circuit, a main control circuit, a PWM (pulse width modulation), a voltage detection and judgment circuit and a transformer switching circuit, wherein the PWM (pulse width modulation) is connected with the inverter circuit; the voltage detection and judgment circuit is connected with the input switch circuit electrically, and is used for detecting the voltage type of the input switch circuit; the transformer switching circuit is connected with the signal output end of the voltage detection and judgment circuit; and the transformer switching circuit is connected with the isolation transformer with a tap, wherein the voltage detection and judgment circuit comprises a power grid voltage state starting-up time-delay reading circuit. According to the invention, the connection and input of two kinds of voltages are realized through the voltage detection and judgment circuit and the transformer switching circuit.
Description
Technical field
What the present invention relates to is electric welding equipment, cutting equipment field, especially is applied to the inverter type welding/cutting machine of two electrical voltage systems of different line voltages.
Background technology
The input voltage of traditional inverter type welding/cutting machine generally is set on the magnitude of voltage in commercial power voltage or the electric consumption on lighting voltage, and welding-cutting machine just can only be refuted and is connected on one of them voltage.For example: the logical inverter type welding/cutting machine of two Daeporis is arranged, the input voltage of a machine is commercial power (380V ± 15%), the input voltage of another machine is electric consumption on lighting (220V ± 15%), first machine just can not be refuted and be connect the lighting mains that input voltage is 220V ± 15%, and second inverter type welding/cutting machine can not be refuted and connect the industrial electrical network that input voltage is 380V ± 15%, if refute the electrical network of wrong mistake, the inverter type welding/cutting machine is cisco unity malfunction not only, and very easily be damaged, have potential safety hazard, this has just limited the scope of application of inverter type welding/cutting machine greatly.Expressly being classified as highly energy-consuming obsolete product AC welding set by country then can adopt the mode of switching its transformer tapping to use neatly on different electrical networks.Such situation makes energy-efficiently, and the popularization of the inverter type welding/cutting machine that national promotion are used is subjected to great resistance, and AC welding set superseded is subjected to great resistance.These situations all make the scope of application of inverter type welding/cutting machine reduce greatly, and this also is the drawback of prior art.
Summary of the invention
At above problem, technical problem to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, implementation cost is lower adopts the inverter type welding/cutting machine of two voltage power supplies, technical scheme of the present invention:
A kind of inverter type welding/cutting machine with two electrical voltage systems, comprise and being linked in sequence according to the current direction direction: input switching circuit, primary side current rectifying and wave filtering circuit, inverter circuit, band tap isolating transformer, secondary side current rectifying and wave filtering circuit, main control circuit, PWM pulse-width modulation circuit, this PWM pulse-width modulation circuit is connected with described inverter circuit;
Wherein, described inverter type welding/cutting machine with two electrical voltage systems also comprises: the voltage detecting decision circuitry that is connected, is used to detect the input switching circuit voltage type with described input switching circuit, the transformer commutation circuit that is connected with this voltage detecting decision circuitry signal output part, described transformer commutation circuit is connected with this band tap isolating transformer, and described voltage detecting decision circuitry comprises line voltage state start time-delay reading circuit;
When input switching circuit is worked, described voltage detecting circuit detects and enters the input switching circuit voltage type, judgement is electric consumption on lighting voltage (220V ± 15%) or commercial power voltage (380V ± 15%), provide different signal levels according to voltage type, after described voltage detecting circuit is delayed time through line voltage state start time-delay reading circuit, tided over this signal level of output behind the transient process complete stability Deng the welding-cutting machine entire circuit, this signal level is delivered to the transformer commutation circuit, through exporting the tap of band tap isolating transformer behind this transformer commutation circuit switched voltage to, finish the conversion of different voltages.
Further, described input switching circuit comprises: power switch; Power network current, voltage will be sent into this welding-cutting machine by power switch.
Described primary side current rectifying and wave filtering circuit comprises: the rectifier bridge that is connected with described power switch, first, second filter capacitor that the order serial connection is in parallel with this rectifier bridge, order serial connection back first, second half-bridge brachium pontis electric capacity in parallel with first filter capacitor, order serial connection back three, four half-bridge brachium pontis electric capacity and with this rectifier bridge in parallel three filter capacitor in parallel with second filter capacitor, order serial connection back first, second bleeder resistance in parallel with described rectifier bridge; The alternating voltage electric current of sending in the welding-cutting machine is rectified into dc voltage and current by rectifier bridge, is sent to inverter circuit through behind the capacitor filtering;
Described inverter circuit comprises: the inverter bridge of being made up of first, second, third, fourth insulated-gate field-effect power switching device bridge joint, be connected first resistance capaciting absorpting circuit between first insulated-gate field-effect power switching device the two poles of the earth, be connected second resistance capaciting absorpting circuit between second insulated-gate field-effect power switching device the two poles of the earth, be connected the 3rd resistance capaciting absorpting circuit between the 3rd insulated-gate field-effect power switching device the two poles of the earth, be connected the 4th resistance capaciting absorpting circuit between the 4th insulated-gate field-effect power switching device the two poles of the earth.
Further, described first resistance capaciting absorpting circuit comprises that the first capacitance-resistance absorption resistance of serial connection and first capacitance-resistance absorb electric capacity, described second resistance capaciting absorpting circuit comprises that the second capacitance-resistance absorption resistance of serial connection and second capacitance-resistance absorb electric capacity, the 3rd resistance capaciting absorpting circuit comprises that the 3rd capacitance-resistance absorption resistance of serial connection and the 3rd capacitance-resistance absorb electric capacity, and described the 4th resistance capaciting absorpting circuit comprises that the 4th capacitance-resistance absorption resistance of serial connection and the 4th capacitance-resistance absorb electric capacity.
Further, described isolation transforming circuit comprises: have first intermediate-frequency transformer of first side winding and secondary side winding, and primary side current transformer, and A.C. contactor,
The described first intermediate-frequency transformer primary side tap is connected respectively with often opening with the normally closed interlock group of A.C. contactor,
One end of described intermediate-frequency transformer first side winding connects the mid point of inverter bridge after through the A.C. contactor sets of contacts, and the other end passes another mid point that connects inverter bridge behind the primary side current transformer;
Described intermediate-frequency transformer secondary side winding is connected with described secondary side current rectifying and wave filtering circuit, insulate between described first side winding and Secondary Winding.
Further, described secondary side current rectifying and wave filtering circuit comprises: be connected with described intermediate-frequency transformer secondary side winding first, second, the 3rd, the 4th fast-recovery commutation diode, the 5th capacitance-resistance absorption resistance and the 5th capacitance-resistance that are serially connected in the first fast-recovery commutation diode two ends absorb electric capacity, be serially connected in second the 6th capacitance-resistance absorption resistance and the 6th capacitance-resistance of recovering the commutation diode two ends and absorb electric capacity, be serially connected in the 3rd the 7th capacitance-resistance absorption resistance and the 7th capacitance-resistance of recovering the commutation diode two ends and absorb electric capacity, and the 8th capacitance-resistance absorption resistance and the 8th capacitance-resistance that are serially connected in the 4th recovery commutation diode two ends absorb electric capacity, the filter inductance that is connected with the first fast-recovery commutation diode output, the 5th filter capacitor and the fictitious load that are connected with the filter inductance output.
The present invention is by adopting the voltage detecting decision circuitry that is connected, is used to detect the input switching circuit voltage type with described input switching circuit, the transformer commutation circuit that is connected with this voltage detecting decision circuitry signal output part, described transformer commutation circuit is connected with this band tap isolating transformer, and described voltage detecting decision circuitry comprises line voltage state start time-delay reading circuit; When input switching circuit is worked, described voltage detecting circuit detects and enters the input switching circuit voltage type, judgement is electric consumption on lighting voltage or commercial power voltage, provide different signal levels according to voltage type, after described voltage detecting circuit is delayed time through line voltage state start time-delay reading circuit, tided over this signal level of output behind the transient process complete stability Deng the welding-cutting machine entire circuit, this signal level is delivered to the transformer commutation circuit, through exporting the tap of band tap isolating transformer behind this transformer commutation circuit switched voltage to, finish the conversion of different voltages.
The inverter type welding/cutting function is large-area to be used more widely in order to make, and the inverter type welding/cutting function is switched on the net easily at lighting mains and commercial power, and that is to say: the inverter type welding/cutting machine must be refuted and be connect lighting mains, powers with power for illumination; Can refute again and connect industrial electrical network, power with industrial electro.
The present invention is simple in structure, and implementation cost is low, has realized that two voltages automatically switch, and by PWM pulse-width modulation circuit and voltage detecting decision circuitry, realizes refuting connecing and imports two kinds of voltages, and is not only energy-efficient, and can be used more widely in large area.
Description of drawings
Fig. 1 is a kind of circuit block diagram with inverter type welding/cutting machine of two electrical voltage systems of the present invention;
Fig. 2 is a kind of main loop circuit schematic diagram with inverter type welding/cutting machine of two electrical voltage systems of the present invention;
Fig. 3 is a kind of master board and PWM pulse-width modulation circuit electrical schematic diagram with inverter type welding/cutting machine of two electrical voltage systems of the present invention;
Fig. 4 is a kind of voltage detecting decision circuitry and transformer commutation circuit electrical schematic diagram with inverter type welding/cutting machine of two electrical voltage systems of the present invention.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is carried out describing in detail in the present embodiment below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also Fig. 1 to Fig. 4, in the present embodiment, a kind of inverter type welding/cutting machine with two electrical voltage systems, the electrical power flow of pressing equipment to, comprising: input switching circuit 1, primary side current rectifying and wave filtering circuit 2, inverter circuit 3, band tap isolating transformer 4, secondary side current rectifying and wave filtering circuit 5 and main control circuit 6, PWM pulse-width modulation circuit 7; Wherein, described inverter type welding/cutting machine with two electrical voltage systems also comprises: the voltage detecting decision circuitry 8 that is connected, is used to detect input switching circuit 1 voltage type with described input switching circuit 1, the transformer commutation circuit 9 that is connected with these voltage detecting decision circuitry 8 signal output parts, described transformer commutation circuit 9 is connected with this band tap isolating transformer 4, and described voltage detecting decision circuitry 8 comprises line voltage state start time-delay reading circuit;
When input switching circuit is worked, described voltage detecting circuit 8 detects and enters the input switching circuit voltage type, judgement is electric consumption on lighting voltage (220V ± 15%) or commercial power voltage (380V ± 15%), provide different signal levels according to voltage type, after described voltage detecting circuit 8 is delayed time through line voltage state start time-delay reading circuit, tided over this signal level of output behind the transient process complete stability Deng the welding-cutting machine entire circuit, this signal level is delivered to transformer commutation circuit 9, through exporting the tap of band tap isolating transformer behind these transformer commutation circuit 9 switched voltages to, finish the conversion of different voltages.
Described input switching circuit comprises: power switch S1; Power network current, voltage will be sent into this welding-cutting machine by power switch S1.
In this specific embodiment, primary side current rectifying and wave filtering circuit 2, comprise: the rectifier bridge QL1 that is connected with described power switch S1, order serial connection in parallel with this rectifier bridge first, the second filter capacitor C43, C44, order serial connection back in parallel with the first filter capacitor C43 first, the second half-bridge brachium pontis capacitor C 45, C46, order serial connection back in parallel with the second filter capacitor C44 the 3rd, the 4th half-bridge brachium pontis capacitor C 47, C48 and the three filter capacitor C49 in parallel with this rectifier bridge QL1, order serial connection back in parallel with described rectifier bridge QL1 first, the second bleeder resistance R59, R60; The alternating voltage electric current of sending in the welding-cutting machine is rectified into dc voltage and current by rectifier bridge, is sent to inverter circuit through behind the capacitor filtering;
Described inverter circuit comprises: by first, second, the 3rd, the 4th insulated-gate field-effect power switching device Q4, Q5, Q6, the inverter bridge that the Q7 bridge joint is formed, be connected first resistance capaciting absorpting circuit between first insulated-gate field-effect power switching device Q4 the two poles of the earth, be connected second resistance capaciting absorpting circuit between second insulated-gate field-effect power switching device Q5 the two poles of the earth, be connected the 3rd resistance capaciting absorpting circuit between the 3rd insulated-gate field-effect power switching device Q6 the two poles of the earth, be connected the 4th resistance capaciting absorpting circuit between the 4th insulated-gate field-effect power switching device Q7 the two poles of the earth.
Described first resistance capaciting absorpting circuit comprises that the first capacitance-resistance absorption resistance R54 of serial connection and first capacitance-resistance absorb capacitor C 39, described second resistance capaciting absorpting circuit comprises that the second capacitance-resistance absorption resistance R55 of serial connection and second capacitance-resistance absorb capacitor C 38, the 3rd resistance capaciting absorpting circuit comprises that the 3rd capacitance-resistance absorption resistance R56 of serial connection and the 3rd capacitance-resistance absorb capacitor C 40, and described the 4th resistance capaciting absorpting circuit comprises that the 4th capacitance-resistance absorption resistance R57 of serial connection and the 4th capacitance-resistance absorb capacitor C 41.
In this specific embodiment, main control circuit, PWM pulse-width modulation circuit from four road pwm signals of socket A6 and A7 output orderly respectively deliver to four groups of insulated-gate field-effect power switching device Q4, Q5, Q6, the grid of Q7 allows it by Q4 and Q7; Q6 and Q5 be conducting simultaneously respectively, and Q4 and Q5; Q6 and Q7 phasic difference 180 mutually
oConducting.Such alternate conduction will be reverse into midfrequent AC square wave current, voltage with DC current, voltage, and this midfrequent AC square wave current, voltage are delivered to the primary side of band tap isolating transformer T4.
In this specific embodiment, band tap isolating transformer 4 is taken on by the intermediate-frequency transformer T4 with primary side band tap winding and secondary side winding, the tap of intermediate-frequency transformer T4 primary side connects often opening and the normally closed interlock group of A.C. contactor JD2B respectively, through being connected to the brachium pontis mid point of inverter bridge behind the relay contact; The other end is connected with this primary side current transformer and connects another mid point of brachium pontis of inverter bridge behind the T3.Its secondary side is received secondary side current rectifying and wave filtering circuit 5, and secondary side current rectifying and wave filtering circuit 5 is one to have centre tapped full-wave rectifying circuit.First side winding and Secondary Winding are by the insulating materials safe insulation.
In this specific embodiment, described secondary side current rectifying and wave filtering circuit comprises: be connected with described intermediate-frequency transformer secondary side winding first, second, the 3rd, the 4th fast-recovery commutation diode D17, D18, D19, D20, the 5th capacitance-resistance absorption resistance R61 and the 5th capacitance-resistance that are serially connected in the first fast-recovery commutation diode D17 two ends absorb capacitor C 50, be serially connected in second the 6th capacitance-resistance absorption resistance R62 and the 6th capacitance-resistance of recovering rectification two utmost point D18 pipe two ends and absorb capacitor C 51, be serially connected in the 3rd the 7th capacitance-resistance absorption resistance R63 and the 7th capacitance-resistance of recovering commutation diode D19 two ends and absorb capacitor C 52, and the 8th capacitance-resistance absorption resistance R64 and the 8th capacitance-resistance that are serially connected in the 4th recovery commutation diode D20 two ends absorb capacitor C 53, the filter inductance L2 that is connected with the first fast-recovery commutation diode D17 output, the 5th filter capacitor C42 and the fictitious load R58 that are connected with filter inductance L2 output.
In this specific embodiment; main control circuit 6, PWM pulse-width modulation circuit 7: given and current feedback circuit by electric current; current foldback circuit; under-voltage protecting circuit; overheating protection circuit; pwm pulse forms and the pwm pulse adjustment circuit, formations such as pwm pulse isolated drive circuit and corresponding auxiliary circuit.
In this specific embodiment, T6(is shown in Figure 2 from band tap control transformer) the two 17V voltages of secondary windings output, introduce master board and PWM pulse-width modulation circuit plate by socket A8, by commutation diode D10, D11, D12, C17 after the D13 rectification, circuit of three-terminal voltage-stabilizing integrated U3 (LM7815) is passed through in C18 filtering again, U5 (LM7805) and U4 (LM7915) voltage stabilizing.Output+15V respectively ,+5V and ,-15V direct-flow steady voltage, this group voltage are that circuit such as master board current feedback and PWM modulation and digital electronic ammeter are powered.
In this specific embodiment, resistance R 49, R46 and C36 form the welding current display circuit, by socket A4 driving LED light sign indicating number pipe DGM1.
In this specific embodiment, RT1(is shown in Figure 2 by the electric current regulator potentiometer), integrated circuit U6A, resistance R 41, R43, R37 capacitor C 30, C33 etc. form error amplifier, and capacitor C 33 is given filter capacitor.Current divider FL1(is shown in Figure 2) and resistance R 38 composition current feedback circuits.Integrated circuit U6C and resistance R 33, R25, R17 Zener diode D16, capacitor C 23 grades are formed error amplifier, and resistance R 17, components such as R25 and capacitor C 13 are pressed and filter circuit.
In this specific embodiment, integrated circuit U1, U2A and U6D have formed under-voltage protection and current mode pwm circuit, wherein, integrated circuit U2A and on every side element form under-voltage protecting circuit, integrated circuit U6D and peripheral circuits thereof are formed the oblique wave compensation circuit.Fast recovery diode D21, D22, D23, D24 and sampling resistor R65 and high-frequency filter capacitor C54(are shown in Figure 2) etc. composition inverter circuit primary side midfrequent AC electric current impulse waveform adopt the whole stream of sample ﹑ ﹑ high-frequency filter circuit.
In this specific embodiment, MOSFET manages M1, M2, M3, the driving resistance R 44 of M4 and its correspondence, R40, R45, R39, pulse transformer T1, T2 and resistance R 47, R48 capacitor C 34, C35 forms pulse amplification and buffer circuit, resistance R 50, R51, R52, R53 are respectively four groups of insulated-gate field-effect power switching device Q4, Q5, Q6, the driving damping resistance of Q7.
In this specific embodiment, (Fig. 4) by diode D2, D5, D6 resistance R 4, R9, R11, R12, R14, R15 capacitor C 4, C6, C7 triode Q1, Q2 integrated circuit U2 etc. form line voltage condition judgement circuit; By resistance R 1, R2, R3, R5, R6 capacitor C 1, C2, C3, C5 diode D1, D3, D4 integrated circuit U1A, U1B etc. form line voltage state start time-delay reading circuit; By metal-oxide-semiconductor Q3 resistance R 7, R8 and relay J D1(JD1A, JD1B JID1C) forms voltage and switches executive circuit; By diode D7, D8, D9 capacitor C 8, C9, C10 resistance R 10, R13 inductance L 1 integrated circuit U3 etc. form super wide voltage scope mu balanced circuit.
In this specific embodiment, described input switching circuit comprises: power network current, line voltage, described power network current, line voltage are sent into welding-cutting machine by power switch.
Described primary side current rectifying and wave filtering circuit comprises: rectifier bridge, and with the filter capacitor that described rectifier bridge is connected, all pressures and bleeder resistance that this filter capacitor is connected.
Described inverter circuit is formed by four groups of insulated-gate field-effect power switching device bridge joints.
Orderly respectively grid that is connected in four groups of insulated-gate field-effect power switching devices and the conducting of four road pwm signals that described main control circuit, PWM pulse-width modulation circuit are exported from socket, described DC current, voltage are reverse into midfrequent AC square wave current, voltage, and this midfrequent AC square wave current, voltage are delivered to the primary side of this band tap isolating transformer.
Described band tap isolating transformer comprises: the intermediate-frequency transformer of primary side band tap winding and secondary side winding; The primary side band tap of this band tap isolating transformer is connected with the normally closed interlock group with the normally open contact group of A.C. contactor respectively, and described normally open contact group and normally closed interlock group are connected to the brachium pontis mid point of inverter bridge respectively with relay contact; The other end of described relay is connected with this primary side current transformer, and this primary side current transformer connects another mid point of brachium pontis of inverter bridge; The secondary side of the brachium pontis of this inverter bridge is received the secondary side current rectifying and wave filtering circuit, and described secondary side current rectifying and wave filtering circuit is for having centre tapped full-wave rectifying circuit.
Described main control circuit; the PWM pulse-width modulation circuit; comprise: the electric current given circuit; the current foldback circuit that the current feedback circuit that is connected with this electric current given circuit is connected with this current feedback circuit; the under-voltage protecting circuit that is connected with this current foldback circuit; the pwm pulse that the overheating protection circuit that is connected with this under-voltage protecting circuit is connected with this overheating protection circuit forms circuit; form the pwm pulse adjustment circuit that circuit is connected with this pwm pulse; the pwm pulse isolated drive circuit that is connected with this pwm pulse adjustment circuit, the auxiliary circuit that is connected with this pwm pulse isolated drive circuit.
Described voltage detecting decision circuitry and transformer commutation circuit, comprise: power supply circuits, this line voltage is by the transformer step-down, the back provides power frequency ac voltage for voltage detecting decision circuitry and transformer commutation circuit, and this voltage is whole voltage detecting decision circuitry and the power supply of transformer commutation circuit.The setting of this voltage, make+12V power supply refutes at welding/cutting power supply and connects electric consumption on lighting voltage (220V ± 15%) or refute when connecing commercial power voltage (380V ± 15%), can both guarantee stable+12V supply voltage, (it is output AC 17.4V that this case establishes that this transformer refutes when connecing electric consumption on lighting at welding/cutting power supply; Refute when connecing commercial power is output AC 30V).
In this specific embodiment, when this pair voltage inverter type welding/cutting machine total power switch S1 opens, voltage detecting circuit at first will be judged the character of line voltage, judgement is electric consumption on lighting voltage (220V ± 15%) or commercial power voltage (380V ± 15%), provides different signal levels according to different voltage; Circuit is waited for through time-delay, just take out this signal level after having tided over the transient process complete stability Deng the welding-cutting machine entire circuit, it is delivered to executive circuit and commutation circuit, go to switch the band tap control transformer of welding-cutting machine and the tap of being with the tap isolating transformer respectively, finish the conversion of different voltages.
In this specific embodiment, after opening welding-cutting machine battery main switch S1, transformer T5(sees Fig. 2) one group of voltage introduce through socket A13, through diode D5, the D6 rectification, C6, R9, deliver to integrated circuit U2 after R12 and C7 filtering power frequency ripple, interference noise and the dividing potential drop and relatively hold C point (integrated circuit U2 and resistance R 4, R11 diode D2 and triode Q1 formation are taken back poor voltage comparator).
In this specific embodiment, refuting what connect when welding-cutting machine is commercial power, then the C point voltage is higher, U2 conducting, D point voltage step-down, after resistance R 4, make the Q1 conducting, make the C point voltage higher after diode D2 and resistance R 11, the D point voltage is low reliably just so, and process is by triode Q2 resistance R 14, deliver to the E point behind the emitter-follower that R15 and capacitor C 4 are formed, this moment, the E point also was a low-voltage.
In this specific embodiment, when opening welding-cutting machine battery main switch S1, resistance R 1, R2, R3, R5, R6 capacitor C 1, C2, C3, C5 diode D1, D3, D4 integrated circuit U1A, composition line voltage states such as the U1B start time-delay reading circuit elapsed time is to make integrated circuit U1B " 10 pin " to become high potential after T1=0.7*R1*C2 and twice time-delay of T2=0.7*R6*C5, then F point current potential just becomes E point decision current potential from the zero potential of original ground connection, also be electronegative potential this moment, and through resistance R 7, R8 delivers to the grid of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 so remain off, relay J D1(JD1A, JD1B, JID1C) dead electricity maintains the original state, its contact JD1B is the 380V tap of tape splicing tap control transformer still, and it is the commercial power power supply mode that the control circuit board circuit is in the 380V power supply; Its contact JID1C still disconnects, A.C. contactor JD2(JD2A, and JD2B) dead electricity, its contact JD2B is the 500V tap of tape splicing tap control isolating transformer still, and main inversion circuit is in 380V power supply, i.e. commercial power power supply mode.
In this specific embodiment, refuting what connect when welding-cutting machine is electric consumption on lighting, and then the C point voltage is lower, and U2 ends, and the D point voltage is high, after resistance R 4 Q1 is ended, and F and resistance R 11 are unsettled inoperative.D point high voltage is delivered to the E point through by triode Q2 resistance R 14 behind the emitter-follower that R15 and capacitor C 4 are formed, and this moment, the E point also was a high potential.
In this specific embodiment, when opening welding-cutting machine battery main switch S1, resistance R 1, R2, R3, R5, R6 capacitor C 1, C2, C3, C5 diode D1, D3, D4 integrated circuit U1A, make integrated circuit U1B " 10 pin " become high potential after composition line voltage states such as U1B start time-delay reading circuit process T1=0.7*R1*C2 and twice time-delay of T2=0.7*R R6*C5, then F point current potential just becomes E point decision current potential from the zero potential of original ground connection, is high potential at this moment, through resistance R 7, R8 delivers to the grid of metal-oxide-semiconductor Q3, therefore metal-oxide-semiconductor Q3 transfers conducting to, relay J D1(JD1A, JD1B, JID1C), its contact JD1B is transferred to the 220V tap of band tap control transformer, and the control circuit board circuit is in 220V power supply, i.e. electric consumption on lighting power supply mode; Its contact JID1C transfers connection to, and A.C. contactor JD2(JD2A JD2B) must be electric, and its contact JD2B is transferred to the 300V tap of band tap control isolating transformer, and main inversion circuit is in 220V power supply, i.e. electric consumption on lighting power supply mode.
In this specific embodiment, resistance R 2 in the line voltage state start time-delay reading circuit, diode D1 and resistance R 5, diode D4 is respectively the shutdown quick discharging circuit of two-stage time-delay reading circuit, can when cutting off the power supply, welding-cutting machine bleed off the electric charge in the electric capacity rapidly, make circuit get back to original state, when guaranteeing that welding-cutting machine switches in the difference net, all arranged enough line voltage state start time-delay readout time.
The above only is preferred embodiment of the present invention, in order to restriction invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. inverter type welding/cutting machine with two electrical voltage systems, comprise and being linked in sequence according to the current direction direction: input switching circuit, primary side current rectifying and wave filtering circuit, inverter circuit, band tap isolating transformer, secondary side current rectifying and wave filtering circuit, main control circuit, PWM pulse-width modulation circuit, this PWM pulse-width modulation circuit is connected with described inverter circuit;
It is characterized in that, described inverter type welding/cutting machine with two electrical voltage systems also comprises: the voltage detecting decision circuitry that is connected, is used to detect the input switching circuit voltage type with described input switching circuit, the transformer commutation circuit that is connected with this voltage detecting decision circuitry signal output part, described transformer commutation circuit is connected with this band tap isolating transformer, and described voltage detecting decision circuitry comprises line voltage state start time-delay reading circuit;
When input switching circuit is worked, described voltage detecting circuit detects and enters the input switching circuit voltage type, judgement is electric consumption on lighting voltage or commercial power voltage, provide different signal levels according to voltage type, after described voltage detecting circuit is delayed time through line voltage state start time-delay reading circuit, tided over this signal level of output behind the transient process complete stability Deng the welding-cutting machine entire circuit, this signal level is delivered to the transformer commutation circuit, through exporting the tap of band tap isolating transformer behind this transformer commutation circuit switched voltage to, finish the conversion of different voltages.
2. according to the described a kind of inverter type welding/cutting machine of claim 1, it is characterized in that described input switching circuit comprises: power switch with two electrical voltage systems; Power network current, voltage will be sent into this welding-cutting machine by power switch;
Described primary side current rectifying and wave filtering circuit comprises: the rectifier bridge that is connected with described power switch, first, second filter capacitor that the order serial connection is in parallel with this rectifier bridge, order serial connection back first, second half-bridge brachium pontis electric capacity in parallel with first filter capacitor, order serial connection back three, four half-bridge brachium pontis electric capacity and with this rectifier bridge in parallel three filter capacitor in parallel with second filter capacitor, order serial connection back first, second bleeder resistance in parallel with described rectifier bridge; The alternating voltage electric current of sending in the welding-cutting machine is rectified into dc voltage and current by rectifier bridge, is sent to inverter circuit through behind the capacitor filtering;
Described inverter circuit comprises: the inverter bridge of being made up of first, second, third, fourth insulated-gate field-effect power switching device bridge joint, be connected first resistance capaciting absorpting circuit between first insulated-gate field-effect power switching device the two poles of the earth, be connected second resistance capaciting absorpting circuit between second insulated-gate field-effect power switching device the two poles of the earth, be connected the 3rd resistance capaciting absorpting circuit between the 3rd insulated-gate field-effect power switching device the two poles of the earth, be connected the 4th resistance capaciting absorpting circuit between the 4th insulated-gate field-effect power switching device the two poles of the earth.
3. according to the described a kind of inverter type welding/cutting machine of claim 2 with two electrical voltage systems, it is characterized in that, described first resistance capaciting absorpting circuit comprises that the first capacitance-resistance absorption resistance of serial connection and first capacitance-resistance absorb electric capacity, described second resistance capaciting absorpting circuit comprises that the second capacitance-resistance absorption resistance of serial connection and second capacitance-resistance absorb electric capacity, the 3rd resistance capaciting absorpting circuit comprises that the 3rd capacitance-resistance absorption resistance of serial connection and the 3rd capacitance-resistance absorb electric capacity, and described the 4th resistance capaciting absorpting circuit comprises that the 4th capacitance-resistance absorption resistance of serial connection and the 4th capacitance-resistance absorb electric capacity.
4. according to the described a kind of inverter type welding/cutting machine of claim 3 with two electrical voltage systems, it is characterized in that described isolation transforming circuit comprises: have first intermediate-frequency transformer of first side winding and secondary side winding, the primary side current transformer, and A.C. contactor
The described first intermediate-frequency transformer primary side tap is connected respectively with often opening with the normally closed interlock group of A.C. contactor,
One end of described intermediate-frequency transformer first side winding connects the mid point of inverter bridge after through the A.C. contactor sets of contacts, and the other end passes another mid point that connects inverter bridge behind the primary side current transformer;
Described intermediate-frequency transformer secondary side winding is connected with described secondary side current rectifying and wave filtering circuit, insulate between described first side winding and Secondary Winding.
5. according to the described a kind of inverter type welding/cutting machine of claim 4 with two electrical voltage systems, it is characterized in that, described secondary side current rectifying and wave filtering circuit comprises: be connected with described intermediate-frequency transformer secondary side winding first, second, the 3rd, the 4th fast-recovery commutation diode, the 5th capacitance-resistance absorption resistance and the 5th capacitance-resistance that are serially connected in the first fast-recovery commutation diode two ends absorb electric capacity, be serially connected in second the 6th capacitance-resistance absorption resistance and the 6th capacitance-resistance of recovering the commutation diode two ends and absorb electric capacity, be serially connected in the 3rd the 7th capacitance-resistance absorption resistance and the 7th capacitance-resistance of recovering the commutation diode two ends and absorb electric capacity, and the 8th capacitance-resistance absorption resistance and the 8th capacitance-resistance that are serially connected in the 4th recovery commutation diode two ends absorb electric capacity, the filter inductance that is connected with the first fast-recovery commutation diode output, the 5th filter capacitor and the fictitious load that are connected with the filter inductance output.
6. according to the described a kind of inverter type welding/cutting machine of claim 5 with two electrical voltage systems; it is characterized in that; described main control circuit; the PWM pulse-width modulation circuit; comprise: the electric current given circuit; the current foldback circuit that the current feedback circuit that is connected with this electric current given circuit is connected with this current feedback circuit; the under-voltage protecting circuit that is connected with this current foldback circuit; the pwm pulse that the overheating protection circuit that is connected with this under-voltage protecting circuit is connected with this overheating protection circuit forms circuit; form the pwm pulse adjustment circuit that circuit is connected with this pwm pulse; the pwm pulse isolated drive circuit that is connected with this pwm pulse adjustment circuit, the auxiliary circuit that is connected with this pwm pulse isolated drive circuit.
7. according to the described a kind of inverter type welding/cutting machine of claim 6 with two electrical voltage systems, it is characterized in that described transformer commutation circuit comprises: power supply circuits, the transformer dropping equipment that is connected with these power supply circuits, the industrial-frequency alternating current volt circuit that is connected with this transformer dropping equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110027728 CN102079002B (en) | 2011-01-26 | 2011-01-26 | Inverter welding and cutting machine with dual-voltage system |
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| CN 201110027728 CN102079002B (en) | 2011-01-26 | 2011-01-26 | Inverter welding and cutting machine with dual-voltage system |
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| CN102079002A true CN102079002A (en) | 2011-06-01 |
| CN102079002B CN102079002B (en) | 2013-06-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416262A (en) * | 2013-09-02 | 2015-03-18 | 无锡精工焊接设备有限公司 | Integrated circuit system of manual welding machine |
| CN104601018A (en) * | 2015-01-16 | 2015-05-06 | 晋中职业技术学院 | Double power supply with protecting circuit for multifunctional argon arc welding machine |
| CN107112917A (en) * | 2014-11-10 | 2017-08-29 | 依赛彼公司 | Multivoltage welder |
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| US20030201262A1 (en) * | 2002-04-24 | 2003-10-30 | Masao Katooka | Power supply apparatus for welder |
| CN2915348Y (en) * | 2006-05-29 | 2007-06-27 | 孟蒙 | Electric welding machine with input voltage self-adaptive circuit |
| CN201017216Y (en) * | 2007-03-29 | 2008-02-06 | 陈仁富 | Double electric voltages self-adaptive controllers used for arc welder |
| CN201063545Y (en) * | 2007-04-10 | 2008-05-21 | 杨冬 | Single-phase, three-phase voltage dual-purpose high-frequency inversion electric welder |
| CN201979200U (en) * | 2011-01-26 | 2011-09-21 | 深圳华意隆电气股份有限公司 | Inverter type welding machine with dual voltage system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030201262A1 (en) * | 2002-04-24 | 2003-10-30 | Masao Katooka | Power supply apparatus for welder |
| CN2915348Y (en) * | 2006-05-29 | 2007-06-27 | 孟蒙 | Electric welding machine with input voltage self-adaptive circuit |
| CN201017216Y (en) * | 2007-03-29 | 2008-02-06 | 陈仁富 | Double electric voltages self-adaptive controllers used for arc welder |
| CN201063545Y (en) * | 2007-04-10 | 2008-05-21 | 杨冬 | Single-phase, three-phase voltage dual-purpose high-frequency inversion electric welder |
| CN201979200U (en) * | 2011-01-26 | 2011-09-21 | 深圳华意隆电气股份有限公司 | Inverter type welding machine with dual voltage system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104416262A (en) * | 2013-09-02 | 2015-03-18 | 无锡精工焊接设备有限公司 | Integrated circuit system of manual welding machine |
| CN107112917A (en) * | 2014-11-10 | 2017-08-29 | 依赛彼公司 | Multivoltage welder |
| CN112958878A (en) * | 2014-11-10 | 2021-06-15 | 依赛彼公司 | Multi-voltage welding device |
| CN104601018A (en) * | 2015-01-16 | 2015-05-06 | 晋中职业技术学院 | Double power supply with protecting circuit for multifunctional argon arc welding machine |
| CN104601018B (en) * | 2015-01-16 | 2017-03-08 | 晋中职业技术学院 | A kind of Multifunctional argon arc welding machine dual power supply with protection circuit |
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| Publication number | Publication date |
|---|---|
| CN102079002B (en) | 2013-06-05 |
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