CN103944429B - The dual-purpose machine of direct-current arc welding, DC motor Driver - Google Patents

Abstract

The invention discloses a kind of direct-current arc welding, the dual-purpose machine of DC motor Driver, it includes main circuit and control circuit, main circuit includes commutator, commutator is connected with wave filter, wave filter is connected with inversion unit, inversion unit is connected with high frequency main transformer, high frequency main transformer is connected with hf rectifier, hf rectifier is connected with high frequency filter, and control circuit includes high-frequency signal generation circuit, frequency detection circuit, signal processing computing circuit, sample circuit, central controller, switching circuit, multi-functional conversion input circuit.It is an advantage of the current invention that: a set of generating equipment can be used to drive direct current movable motor and DC arc welder respectively, advantageously reduce equipment cost taken by themselves, inverter circuit of the present invention have employed high frequency main transformer, greatly reduce equipment volume and weight, improve efficiency, reduce further equipment cost simultaneously.

Description

The dual-purpose machine of direct-current arc welding, DC motor Driver

Technical field

The present invention relates to a kind of generating equipment, specifically a kind of direct-current arc welding, the dual-purpose machine of DC motor Driver.

Background technology

The operation principle of contravariant DC arc welder is: by 50HZ three-phase 380V AC rectification, be reverse into high frequency (more than 20KHZ) alternating current, then through inversion main transformer blood pressure lowering, rectification again, control circuit by arc-welding and will export the unidirectional current of " voltage-to-current " characteristic of an applicable electric welding requirement, thus execute real electric welding field.Direct current generator then needs a unidirectional current meeting direct current generator " voltage-to-current " characteristic and " weak-magnetic speed-regulating " characteristic requirements, therefore it is respectively provided with, with dynamic portable welding equipment, the power-equipment that two sets are independent at present, being respectively used to drive vehicle to run and power to welding machine, equipment cost taken by themselves is higher.Additionally, at present by exchanging the internal combustion engine generator group direct current motor drive circuit as power, be all unit provide alternating current through Industrial Frequency Transformer blood pressure lowering, rectification to drive direct current generator to operate, obvious Industrial Frequency Transformer not only volume is big, Heavy Weight, and the iron loss expended and copper loss are the biggest, not only efficiency is low but also cost is also the highest.

Summary of the invention

It is an object of the invention to provide a kind of direct-current arc welding, the dual-purpose machine of DC motor Driver, it can use a set of generating equipment to drive direct current movable motor and DC arc welder respectively, advantageously reduce equipment cost taken by themselves, inverter circuit of the present invention have employed high frequency main transformer, compared with the drive circuit of existing employing Industrial Frequency Transformer, greatly reduce equipment volume and weight, improve efficiency, reduce further equipment cost simultaneously.

The present invention is for achieving the above object, it is achieved through the following technical solutions: include main circuit and control circuit, main circuit includes commutator, the outfan of commutator is connected with the input of wave filter, the outfan of wave filter is connected with the input of inversion unit, the outfan of inversion unit is connected with the input of high frequency main transformer, the outfan of high frequency main transformer is connected with the input of hf rectifier, the outfan of hf rectifier is connected with the input of high frequency filter, control circuit includes high-frequency signal generation circuit, frequency detection circuit, signal processing computing circuit, sample circuit, central controller, switching circuit, multi-functional conversion input circuit.nullThe annexation of main circuit and control circuit is as follows: commutator is by the voltage of input、The three-phase alternating current of changeable frequency is rectified into unidirectional current by after commutator U9，Wave filter is by electric capacity C1、Electric capacity C5、Electric capacity C6 and resistance R1、Resistance R2 forms，Electric capacity C1 is Absorption Capacitance，C5、C6 is filter capacitor，R1、R2 is equalizing resistance，One end of electric capacity C1 is connected with the positive output end of commutator U9，The other end is connected with the negative output terminal of commutator U9，Resistance R1 is in parallel with electric capacity C5，Resistance R2 is in parallel with electric capacity C6，Electric capacity C5 positive pole is connected with one end of electric capacity C1，Electric capacity C5 negative pole is connected with electric capacity C6 positive pole，Electric capacity C6 negative pole is connected with the other end of electric capacity C1，The unidirectional current of input is passed through inversion unit U10 inverter output frequency 10 ~ 100kHz high-frequency alternating current by inversion unit，High frequency main transformer is by high frequency transformer T3、D.C. contactor K3 and binding post J8 composition，Binding post J8 is D.C. contactor K3 coil outer binding post，The number of turn of high frequency transformer T3 is realized changing by controlling D.C. contactor K3，High frequency transformer T3 is by the winding I of primary side、Winding II and one winding of secondary side are constituted，Two windings in series of the primary side of high frequency transformer T3，The other end of first side winding I exchanges outlet side one end and is connected with inversion unit U10，The other end of first side winding II exchanges the outlet side other end and is connected with inversion unit U10，The normally opened contact of D.C. contactor K3 is in parallel with first side winding II，The coil two ends of D.C. contactor K3 are connected respectively to pin 1 and the pin 2 of binding post J8，The secondary side winding two ends of high frequency transformer T3 export，The alternating current that secondary side winding two ends are obtained by high frequency transformer T3 exports unidirectional current by hf rectifier U13 rectification，High frequency filter is made up of inductance L4 and electric capacity C7，One end of inductance L4 is connected with the positive output end of hf rectifier U13，The other end of inductance L4 is connected with the positive pole of electric capacity C7，The negative pole of electric capacity C7 is connected with the negative output terminal of hf rectifier U13，The outside positive output end of dual-purpose machine is connected with the positive pole of electric capacity C7，The outside negative output terminal of dual-purpose machine is connected with the negative pole of electric capacity C7，The pin 1 of the power module U15 of high-frequency signal generation circuit be connected to power supply ' 12V，The pin 2 of power module U15 be connected to power supply ' 0V，Power supply-15V is obtained on the pin 3 of power module U15，The pin 4 of power module U15 is connected to 0V power supply，Power supply+15V is obtained on the pin 5 of power module U15，Electric capacity C41 connects with electric capacity C42，The negative pole of electric capacity C41 is connected with the pin 3 of power module U15，The positive pole of electric capacity C41 is connected with the pin 4 of power module U15，The positive pole of electric capacity C42 is connected with the pin 5 of power module U15，Electric capacity C44 is in parallel with electric capacity C41，Electric capacity C43 is in parallel with electric capacity C42，The pin 1 of power module U16 is connected to power supply+15V，The pin 2 of power module U16 is connected to power supply 0V，The positive pole of electric capacity C46 is connected with the pin 3 of power module U16，The negative pole of electric capacity C46 is connected to power supply 0V，Electric capacity C45 is in parallel with electric capacity C46，To determining voltage signal QG through electric capacity C9、Electric capacity C10、Resistance R4、Resistance R5、Operational amplifier U15、Resistance R6、The filter network of electric capacity C11 composition is to 5 feet of control chip U1，Setting signal is provided for control chip U1 work，One end of resistance R4 is connected with electric capacity C9，The electric capacity C9 other end is connected to power supply 0V，The other end of resistance R4 is connected with the in-phase input end of operational amplifier U15，Resistance R5 is connected with the in-phase input end of operational amplifier U15 with one end after electric capacity C10 parallel connection，The other end is connected to power supply 0V，The inverting input of operational amplifier U15 is connected with outfan，It is connected to control chip U1 pin 5 by resistance R6，The pin 5 of control chip U1 is connected with electric capacity C11 one end，The electric capacity C11 other end is connected to power supply 0V，Resistance R7、Resistance R8、Electric capacity C28、Electric capacity C29 makes control chip U1 work can soft start，Resistance R8 is in parallel with electric capacity C29，The positive pole of electric capacity C29 and control chip U1 pin 1，The negative pole of electric capacity C29 is connected to power supply 0V，Resistance R7 connects with electric capacity C28，The negative pole of electric capacity C28 is connected to power supply 0V，The positive pole of electric capacity C29 and control chip U1 pin 2，The other end of resistance R7 is connected with control chip U1 pin 1，High frequency transformer primary side current is carried out sampling gained signal through resistance R14 by current sensor U11、Resistance R15、Resistance R16、Resistance R17、The filter network of electric capacity C18 composition is to 4 feet of control chip U1，Setting signal is provided for control chip U1 work，Resistance R16 connects with resistance R17，The other end of resistance R17 is connected with the output of current sensor U11，The other end of resistance R16 is connected with control chip U1 pin 4，Control chip U1 pin 4 is connected to-15V power supply by resistance R14，Control chip U1 pin 4 is connected to power supply 0V by resistance R15，Harmonic compensation electricity routing resistance R11、Resistance R12、Electric capacity C15、Electric capacity C16、Operational amplifier U16 forms，The in-phase input end of operational amplifier U16 is connected with control chip U1 pin 8，The inverting input of operational amplifier U16 is connected with outfan，Resistance R11、Electric capacity C16 is in parallel with resistance R12 and electric capacity C15 after connecting，Electric capacity C15 one end is connected with control chip U1 pin 4，The electric capacity C15 other end is connected with operational amplifier U16 outfan，Concussion timing circuit is by resistance R9、Resistance R10、Electric capacity C12、Electric capacity C14 forms，Resistance R9 is in parallel with resistance R10，One end is connected with control chip U1 pin 8，The other end is connected to power supply 0V，Electric capacity C12 is in parallel with electric capacity C14，One end is connected with control chip U1 pin 9，The other end is connected to power supply 0V，High frequency transformer primary side current is carried out sampling gained signal through resistance R17 by current sensor U11、Resistance R18、Resistance R19、Electric capacity C18、Electric capacity C19 provides outside for control chip U1 and turns off，Resistance R17 and resistance R18 is connected in series to control chip U1 pin 16，Resistance R19 is in parallel with electric capacity C19，One end is connected with control chip U1 pin 16，The other end is connected to power supply 0V，Resistance R13 is the protective resistance of control chip U1 output stage biased voltage input，Electric capacity C13、Electric capacity C17、Electric capacity C30、Electric capacity C31 is filter capacitor，Resistance R13 one end is connected with control chip U1 pin 15，The resistance R13 other end is connected with control chip U1 pin 13，Electric capacity C13 is in parallel with electric capacity C30，One end is connected with control chip U1 pin 15，The other end is connected to power supply 0V，Electric capacity C17 is in parallel with electric capacity C31，One end is connected with control chip U1 pin 13，The other end is connected to power supply 0V，By diode D10、Diode D11、Resistance R20、Resistance R21、Resistance R22、Resistance R23、Audion Q1、Audion Q2、Audion Q3、Audion Q4、Resistance R24、Electric capacity C20 forms full-bridge circuit，Two paths of signals is through isolating transformer T1、Isolating transformer T2、Electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24、Resistance R25、Resistance R26、Resistance R27、Resistance R28、Resistance R29、Resistance R30、Resistance R31、Resistance R70、Diode D12、Diode D13、Diode D14、Diode D15 becomes four road signals and drives inversion unit，The base stage of audion Q1 is connected with control chip U1 pin 14 by resistance R20，The base stage of audion Q3 is connected with control chip U1 pin 14 by resistance R21，The negative electrode of diode D10 is connected with control chip U1 pin 14，The anode of diode D10 is connected to power supply 0V，The base stage of audion Q2 is connected with control chip U1 pin 11 by resistance R22，The base stage of audion Q4 is connected with control chip U1 pin 11 by resistance R23，The negative electrode of diode D11 is connected with control chip U1 pin 14，The anode of diode D11 is connected to power supply 0V，Audion Q1 colelctor electrode is connected with the pin 1 of isolating transformer T1 and isolating transformer T2 after being connected with audion Q3 colelctor electrode，After audion Q2 colelctor electrode is connected with audion Q4 colelctor electrode，It is connected with the one end after resistance R24 and electric capacity C20 parallel connection，Resistance R24 is connected with the pin 2 of isolating transformer T1 and isolating transformer T2 with the other end after electric capacity C20 parallel connection，Audion Q3 emitter stage is connected to power supply 0V，Audion Q4 emitter stage is connected to power supply 0V，Audion Q1 emitter stage is connected with audion Q2 emitter stage，Diode D15 is in parallel with resistance R25 after connecting with resistance R70，Diode D15 negative electrode is connected with isolating transformer T1 pin 6，The other end of resistance R70 is connected with electric capacity C21 one end，The electric capacity C21 other end is connected with isolating transformer T1 pin 5，Diode D12 is in parallel with resistance R26 after connecting with resistance R29，Diode D12 negative electrode is connected with isolating transformer T1 pin 3，The other end of resistance R29 is connected with electric capacity C22 one end，The electric capacity C22 other end is connected with isolating transformer T1 pin 4，Diode D13 is in parallel with resistance R27 after connecting with resistance R30，Diode D13 negative electrode is connected with isolating transformer T2 pin 6，The other end of resistance R30 is connected with electric capacity C23 one end，The electric capacity C23 other end is connected with isolating transformer T2 pin 5，Diode D14 is in parallel with resistance R28 after connecting with resistance R31，Diode D14 negative electrode is connected with isolating transformer T2 pin 3，The other end of resistance R31 is connected with electric capacity C24 one end，The electric capacity C24 other end is connected with isolating transformer T2 pin 4，Respectively at electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24 two ends obtain four road signals and drive inversion unit，Resistance R54、Diode D2、Optocoupler U6、Resistance R61、R62 component frequency testing circuit，Obtain corresponding frequency signal and send into control chip U8，One end of resistance R54 is connected with the U phase of three-phase alternating current，The other end of resistance R54 is connected with the anode of diode D2，The negative electrode of diode D2 is connected with the pin 1 of optocoupler U6，The pin 2 of optocoupler U6 is connected with the V phase of three-phase alternating current，The pin 3 of optocoupler U6 is connected with one end of R61，The other end of R61 is connected to+5V power supply，The pin 3 of optocoupler U6 is connected with one end of R62，The other end of R62 is connected to the pin 9 of control chip U8，In signal processing computing circuit, signal processing is exported through resistance R63 by control chip U8、Voltage signal is obtained after electric capacity C4，This signal is by obtaining Setting signal UQG after the voltage follower of the C portion U3C composition of operational amplifier U3，Control chip U8 pin 5 is connected with operational amplifier U3 pin 10 by resistance R63，One end of electric capacity C4 is connected with operational amplifier U3 pin 10，The other end of electric capacity C4 is connected to power supply 0V，Operational amplifier U3 pin 8 is connected with operational amplifier U3 pin 9，The current sensor that circuit is used is current mode current sensor，Resistance R52 obtains voltage through diode D1、Resistance R32、Electric capacity C25、Inductance L5、Resistance R3、Electric capacity C26、The filter network of C27 composition，Obtain required voltage，Receive the end of oppisite phase of part A U2A of operational amplifier U2，Load current is sampled the signal obtained by diode D1 by current sensor U12、Inductance L5、Resistance R3 is connected with operational amplifier U2 pin 2，Diode D1 anode is connected with sensor output，One end of resistance R52 is connected with diode D1 anode，The other end of resistance R52 is connected to power supply 0V，Resistance R32 is connected with diode D1 negative electrode with one end after electric capacity C25 parallel connection，The other end is connected to power supply 0V，Electric capacity C26 one end is connected with inductance L5 and resistance R3 junction，The electric capacity C26 other end is connected to power supply 0V，Electric capacity C27 one end is connected with operational amplifier U2 pin 2，The electric capacity C27 other end is connected to power supply 0V，Resistance R40、Resistance R41、Resistance R42 carries out dividing potential drop to output voltage，Voltage sensor gathers the voltage on resistance R42，The voltage sensor that circuit is used is current mode voltage sensor，Resistance R44 obtains required voltage，This voltage and Setting signal UQG are through by the part B of U3B operational amplifier U3、Resistance R43、Resistance R45、Resistance R46、Resistance R47、Resistance R48、The voltage that the voltage signal obtained after the P actuator of resistance R49 composition obtains after the voltage follower of the part A U3A composition of operational amplifier U3 is by resistance R37、Resistance R38、Resistance R39、Diode D9、Diode D6、Diode D5 discharge and recharge network carries out discharge and recharge to electric capacity C8，Electric capacity C8 obtains to determining voltage signal QG，The outside positive output end of dual-purpose machine passes through resistance R40、Resistance R41 and resistance R42 is connected in series to the outside negative output terminal of dual-purpose machine，Voltage sensor U14 pin 1 is connected with resistance R40 and resistance R42 junction，Voltage sensor U14 pin 2 is connected with resistance R41 and resistance R42 junction，Voltage sensor U14 pin 3 and resistance R44 one end are connected to power supply 0V，Voltage sensor U14 pin 4 is connected with the resistance R44 other end，Voltage sensor U14 pin 4 is connected with operational amplifier U2 pin 6，Voltage sensor U14 pin 4 is connected with operational amplifier U3 pin 6 by resistance R45，Operational amplifier U3 pin 6 is connected with operational amplifier U3 pin 7 by resistance R43，Operational amplifier U3 pin 6 is connected to power supply 0V by resistance R46，Operational amplifier U3 pin 6 is connected to+5V power supply by resistance R48，Operational amplifier U3 pin 5 is connected to power supply 0V by resistance R49，Operational amplifier U3 pin 5 is connected with operational amplifier U3 pin 8 by resistance R48，Operational amplifier U3 pin 7 is connected with operational amplifier U3 pin 3，Operational amplifier U3 pin 1 is connected with operational amplifier U3 pin 2，Resistance R39 is in parallel with resistance R38 after connecting with diode D9，Diode D9 negative electrode is connected with operational amplifier U3 pin 1，The other end of resistance R39 is connected with electric capacity C8 positive pole，Electric capacity C8 negative pole is connected to power supply 0V，Resistance R37 connects with diode D6，The other end of resistance R37 is connected with electric capacity C8 positive pole，Diode D6 negative electrode is connected with operational amplifier U2 pin 1，Diode D5 anode is connected with diode D6 anode，Diode D5 negative electrode is connected with operational amplifier U2 pin 7，Resistance R51、Diode D8 constitutes current protection indicating circuit，Part A U2A of operational amplifier U2 constitutes hysteresis loop comparator with resistance R50，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R34 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output electric current is changed by adjusting resistance R34 value，Resistance R34 pin 1 is connected to+5V power supply，Resistance R34 pin 3 is connected to power supply 0V，Resistance R34 pin 2 is connected with operational amplifier U2 pin 3，Operational amplifier U2 pin 3 is connected with operational amplifier U2 pin 1 by resistance R50，Resistance R51 is connected with diode D8，Diode D8 anode is connected to+5V power supply，The resistance R51 other end is connected with operational amplifier U2 pin 1，Resistance R36、Diode D7 constitutes overvoltage indicating circuit，Part B U2B of operational amplifier U2 constitutes hysteresis loop comparator with resistance R35，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R33 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output voltage is changed by adjusting resistance R33 value，Resistance R33 pin 1 is connected to+5V power supply，Resistance R33 pin 3 is connected to power supply 0V，Resistance R33 pin 2 is connected with operational amplifier U2 pin 5，Operational amplifier U2 pin 5 is connected with operational amplifier U2 pin 7 by resistance R35，Resistance R36 and diode D7，Diode D7 negative electrode is connected with operational amplifier U2 pin 7，The resistance R51 other end is connected to+5V power supply，High frequency transformer primary side current is sampled by the current sensor U11 of sample circuit，Load current is sampled by current sensor U12，Load voltage is sampled by voltage sensor U14，Connector J3、Resistance R56、Optocoupler U5、Resistance R59、Resistance R60 forms temperature sampling circuit，Obtain corresponding temperature signal and send into control chip U8，The pin 1 of optocoupler U5 by resistance R56 be connected to ' 12V power supply，The pin 2 of optocoupler U5 is connected with the pin 2 of binding post J3，The pin 1 of binding post J3 be connected to power supply ' 0V，The pin 4 of optocoupler U5 is connected to+5V power supply by resistance R59，The pin 3 of optocoupler U5 is connected to power supply 0V，One end of resistance R60 is connected with the pin 4 of optocoupler U5，One end of resistance R60 is connected with the pin 10 of control chip U8，Programming port J1、Resistance R53、Control chip U8、Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 forms central controller，Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 forms clock circuit，Operating clock signals is provided for control chip U8，One end of electric capacity C2 is connected with one end of crystal oscillator Y1，The other end of electric capacity C2 is connected to power supply 0V，One end of electric capacity C3 is connected with the other end of crystal oscillator Y1，The other end of electric capacity C3 is connected to power supply 0V，One end of crystal oscillator Y1 is connected with the pin 2 of control chip U8，The other end of crystal oscillator Y1 is connected with the pin 3 of control chip U8，The pin 1 of programming port J1 is connected with the pin 4 of control chip U8，The pin 2 of programming port J1 is connected to+5V power supply，The pin 3 of programming port J1 is connected to power supply 0V，The pin 4 of programming port J1 is connected with the pin 13 of control chip U8，The pin 5 of programming port J1 is connected with the pin 12 of control chip U8，Switching circuit passes through relay K 1、Diode D3、Inductance L6、Inductance L7、Audion Q5、Resistance R65、Connector J4、Connector J5、Setting signal is switched over by connector J6，By resistance R64、Optocoupler U7、Resistance R66、Diode D4、Relay K 2、Audion Q6、Main transformer is switched over by connector J7，The pin 6 of control chip U8 is connected with one end of resistance R65，The other end of resistance R65 is connected with audion Q5 base stage，Audion Q5 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to+15V power supply by inductance L6，The coil of relay K 1 is in parallel with diode D3，Audion Q5 emitter stage is connected to power supply 0V by inductance L7，The pin 1 of relay K 1 is connected with the pin 2 of binding post J4，The pin 4 of relay K 1 is connected with the pin 1 of binding post J4，The pin 2 of relay K 1 is connected with the pin 1 of binding post J5，The pin 5 of relay K 1 is connected with the pin 2 of binding post J5，The pin 3 of relay K 1 is connected with the pin 1 of binding post J6，The pin 6 of relay K 1 is connected with the pin 2 of binding post J6，The pin 7 of control chip U8 is connected with the pin 2 of optocoupler U7，The pin 1 of optocoupler U7 is connected to+5V power supply by resistance R64，The pin 3 of optocoupler U7 is connected to ' 12V power supply,The pin 4 of optocoupler U7 is connected to audion Q6 base stage by resistance R66，Audion Q6 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to ' 12V power supply，The coil of relay K 2 is in parallel with diode D4，Audion Q6 emitter stage be connected to power supply ' 0V，The pin 4 of relay K 1 is connected to ' 12V power supply，The pin 6 of relay K 1 is connected with the pin 1 of binding post J7，The pin 2 of binding post J7 be connected to power supply ' 0V，Connector J2、Resistance R55、Optocoupler U4、Resistance R57、Resistance R58 forms multi-functional conversion input circuit，Obtain corresponding mode signal and send into control chip U8，The pin 1 of optocoupler U4 by resistance R55 be connected to ' 12V power supply，The pin 2 of optocoupler U4 is connected with the pin 2 of binding post J2，The pin 1 of binding post J2 be connected to power supply ' 0V，The pin 4 of optocoupler U4 is connected to+5V power supply by resistance R57，The pin 3 of optocoupler U4 is connected to power supply 0V，One end of resistance R58 is connected with the pin 4 of optocoupler U4，One end of resistance R58 is connected with the pin 11 of control chip U8.Main circuit and control circuit are respectively mounted in the housing, housing is rectangle, handle is installed in one side of housing, arranging master switch, function switching switch on one end face of housing, welding current adjusts knob, striking current adjusts knob, joints made by electric welding, motor drive sub and three-phase alternating current out splice going splice.

It is an advantage of the current invention that: a set of generating equipment can be used to drive direct current movable motor and DC arc welder respectively, advantageously reduce equipment cost taken by themselves, inverter circuit of the present invention have employed high frequency main transformer, compared with the drive circuit of existing employing Industrial Frequency Transformer, greatly reduce equipment volume and weight, improve efficiency, reduce further equipment cost simultaneously.

Accompanying drawing explanation

Fig. 1 is contour structures schematic diagram of the present invention；

Fig. 2 is circuit connecting relation schematic diagram of the present invention；

Fig. 3 is one of electrical schematic diagram of the present invention, and Fig. 3 right part connects with Fig. 4 left part；

Fig. 4 is the two of electrical schematic diagram of the present invention, and Fig. 4 left part connects with Fig. 3 right part, and Fig. 4 right part connects with Fig. 5 left part；

Fig. 5 is the three of electrical schematic diagram of the present invention, and Fig. 5 left part connects with Fig. 4 right part.

Detailed description of the invention

Direct-current arc welding of the present invention, the dual-purpose machine of DC motor Driver includes main circuit and control circuit, main circuit includes commutator 1, the outfan of commutator 1 is connected with the input of wave filter 2, the outfan of wave filter 2 is connected with the input of inversion unit 3, the outfan of inversion unit 3 is connected with the input of high frequency main transformer 4, the outfan of high frequency main transformer 4 is connected with the input of hf rectifier 5, the outfan of hf rectifier 5 is connected with the input of high frequency filter 6, control circuit includes high-frequency signal generation circuit 7, frequency detection circuit 8, signal processing computing circuit 9, sample circuit 10, central controller 11, switching circuit 12, multi-functional conversion input circuit 13.The present invention uses main circuit and the high frequency main transformer of the multichannel secondary coil with the different number of turn of a set of " rectification-inversion-blood pressure lowering-rectification again ", is respectively cooperating with meeting control circuit and the function switch of " direct-current arc welding " and " DC motor Driver " characteristic requirements.When function switch is threaded to " electric welding field " gear, internal combustion engine generator group sets the fixed rotating speed operating mode being operated in rated frequency.Being also turned on high frequency main transformer and be suitable for secondary coil and " direct-current arc welding " control circuit of the electric welding function number of turn, " dual-purpose machine " presents " direct-current arc welding " function.When functional switch is threaded to " motor driving " gear, internal combustion engine generator group sets and is operated in " natural frequency conversion, transformation " operating mode.Being also turned on high frequency main transformer and be suitable for secondary coil and " DC motor Driver " control circuit of the DC motor Driver function number of turn, " dual-purpose machine " presents " DC motor Driver " function, thus drives the infinitely variable speeds walking of " engineering truck " chassis.The present invention can use a set of generating equipment to drive direct current movable motor and DC arc welder respectively, advantageously reduce equipment cost taken by themselves, inverter circuit of the present invention have employed high frequency main transformer, compared with the drive circuit of existing employing Industrial Frequency Transformer, greatly reduce equipment volume and weight, improve efficiency, reduce further equipment cost simultaneously.

nullThe annexation of main circuit of the present invention and control circuit is as follows: commutator 1 is by the voltage of input、The three-phase alternating current of changeable frequency is rectified into unidirectional current by after commutator U9，Wave filter 2 is by electric capacity C1、Electric capacity C5、Electric capacity C6 and resistance R1、Resistance R2 forms，Electric capacity C1 is Absorption Capacitance，C5、C6 is filter capacitor，R1、R2 is equalizing resistance，One end of electric capacity C1 is connected with the positive output end of commutator U9，The other end is connected with the negative output terminal of commutator U9，Resistance R1 is in parallel with electric capacity C5，Resistance R2 is in parallel with electric capacity C6，Electric capacity C5 positive pole is connected with one end of electric capacity C1，Electric capacity C5 negative pole is connected with electric capacity C6 positive pole，Electric capacity C6 negative pole is connected with the other end of electric capacity C1，The unidirectional current of input is passed through inversion unit U10 inverter output frequency 10 ~ 100kHz high-frequency alternating current by inversion unit 3，High frequency main transformer 4 is by high frequency transformer T3、D.C. contactor K3 and binding post J8 composition，Binding post J8 is D.C. contactor K3 coil outer binding post，The number of turn of high frequency transformer T3 is realized changing by controlling D.C. contactor K3，High frequency transformer T3 is by the winding I of primary side、Winding II and one winding of secondary side are constituted，Two windings in series of the primary side of high frequency transformer T3，The other end of first side winding I exchanges outlet side one end and is connected with inversion unit U10，The other end of first side winding II exchanges the outlet side other end and is connected with inversion unit U10，The normally opened contact of D.C. contactor K3 is in parallel with first side winding II，The coil two ends of D.C. contactor K3 are connected respectively to pin 1 and the pin 2 of binding post J8，The secondary side winding two ends of high frequency transformer T3 export，The alternating current that secondary side winding two ends are obtained by high frequency transformer T3 exports unidirectional current by hf rectifier 5U13 rectification，High frequency filter 6 is made up of inductance L4 and electric capacity C7，One end of inductance L4 is connected with the positive output end of hf rectifier U13，The other end of inductance L4 is connected with the positive pole of electric capacity C7，The negative pole of electric capacity C7 is connected with the negative output terminal of hf rectifier U13，The outside positive output end of dual-purpose machine is connected with the positive pole of electric capacity C7，The outside negative output terminal of dual-purpose machine is connected with the negative pole of electric capacity C7，The pin 1 of the power module U15 of high-frequency signal generation circuit 7 be connected to power supply ' 12V，The pin 2 of power module U15 be connected to power supply ' 0V，Power supply-15V is obtained on the pin 3 of power module U15，The pin 4 of power module U15 is connected to 0V power supply，Power supply+15V is obtained on the pin 5 of power module U15，Electric capacity C41 connects with electric capacity C42，The negative pole of electric capacity C41 is connected with the pin 3 of power module U15，The positive pole of electric capacity C41 is connected with the pin 4 of power module U15，The positive pole of electric capacity C42 is connected with the pin 5 of power module U15，Electric capacity C44 is in parallel with electric capacity C41，Electric capacity C43 is in parallel with electric capacity C42，The pin 1 of power module U16 is connected to power supply+15V，The pin 2 of power module U16 is connected to power supply 0V，The positive pole of electric capacity C46 is connected with the pin 3 of power module U16，The negative pole of electric capacity C46 is connected to power supply 0V，Electric capacity C45 is in parallel with electric capacity C46，To determining voltage signal QG through electric capacity C9、Electric capacity C10、Resistance R4、Resistance R5、Operational amplifier U15、Resistance R6、The filter network of electric capacity C11 composition is to 5 feet of control chip U1，Setting signal is provided for control chip U1 work，One end of resistance R4 is connected with electric capacity C9，The electric capacity C9 other end is connected to power supply 0V，The other end of resistance R4 is connected with the in-phase input end of operational amplifier U15，Resistance R5 is connected with the in-phase input end of operational amplifier U15 with one end after electric capacity C10 parallel connection，The other end is connected to power supply 0V，The inverting input of operational amplifier U15 is connected with outfan，It is connected to control chip U1 pin 5 by resistance R6，The pin 5 of control chip U1 is connected with electric capacity C11 one end，The electric capacity C11 other end is connected to power supply 0V，Resistance R7、Resistance R8、Electric capacity C28、Electric capacity C29 makes control chip U1 work can soft start，Resistance R8 is in parallel with electric capacity C29，The positive pole of electric capacity C29 and control chip U1 pin 1，The negative pole of electric capacity C29 is connected to power supply 0V，Resistance R7 connects with electric capacity C28，The negative pole of electric capacity C28 is connected to power supply 0V，The positive pole of electric capacity C29 and control chip U1 pin 2，The other end of resistance R7 is connected with control chip U1 pin 1，High frequency transformer primary side current is carried out sampling gained signal through resistance R14 by current sensor U11、Resistance R15、Resistance R16、Resistance R17、The filter network of electric capacity C18 composition is to 4 feet of control chip U1，Setting signal is provided for control chip U1 work，Resistance R16 connects with resistance R17，The other end of resistance R17 is connected with the output of current sensor U11，The other end of resistance R16 is connected with control chip U1 pin 4，Control chip U1 pin 4 is connected to-15V power supply by resistance R14，Control chip U1 pin 4 is connected to power supply 0V by resistance R15，Harmonic compensation electricity routing resistance R11、Resistance R12、Electric capacity C15、Electric capacity C16、Operational amplifier U16 forms，The in-phase input end of operational amplifier U16 is connected with control chip U1 pin 8，The inverting input of operational amplifier U16 is connected with outfan，Resistance R11、Electric capacity C16 is in parallel with resistance R12 and electric capacity C15 after connecting，Electric capacity C15 one end is connected with control chip U1 pin 4，The electric capacity C15 other end is connected with operational amplifier U16 outfan，Concussion timing circuit is by resistance R9、Resistance R10、Electric capacity C12、Electric capacity C14 forms，Resistance R9 is in parallel with resistance R10，One end is connected with control chip U1 pin 8，The other end is connected to power supply 0V，Electric capacity C12 is in parallel with electric capacity C14，One end is connected with control chip U1 pin 9，The other end is connected to power supply 0V，High frequency transformer primary side current is carried out sampling gained signal through resistance R17 by current sensor U11、Resistance R18、Resistance R19、Electric capacity C18、Electric capacity C19 provides outside for control chip U1 and turns off，Resistance R17 and resistance R18 is connected in series to control chip U1 pin 16，Resistance R19 is in parallel with electric capacity C19，One end is connected with control chip U1 pin 16，The other end is connected to power supply 0V，Resistance R13 is the protective resistance of control chip U1 output stage biased voltage input，Electric capacity C13、Electric capacity C17、Electric capacity C30、Electric capacity C31 is filter capacitor，Resistance R13 one end is connected with control chip U1 pin 15，The resistance R13 other end is connected with control chip U1 pin 13，Electric capacity C13 is in parallel with electric capacity C30，One end is connected with control chip U1 pin 15，The other end is connected to power supply 0V，Electric capacity C17 is in parallel with electric capacity C31，One end is connected with control chip U1 pin 13，The other end is connected to power supply 0V，By diode D10、Diode D11、Resistance R20、Resistance R21、Resistance R22、Resistance R23、Audion Q1、Audion Q2、Audion Q3、Audion Q4、Resistance R24、Electric capacity C20 forms full-bridge circuit，Two paths of signals is through isolating transformer T1、Isolating transformer T2、Electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24、Resistance R25、Resistance R26、Resistance R27、Resistance R28、Resistance R29、Resistance R30、Resistance R31、Resistance R70、Diode D12、Diode D13、Diode D14、Diode D15 becomes four road signals and drives inversion unit，The base stage of audion Q1 is connected with control chip U1 pin 14 by resistance R20，The base stage of audion Q3 is connected with control chip U1 pin 14 by resistance R21，The negative electrode of diode D10 is connected with control chip U1 pin 14，The anode of diode D10 is connected to power supply 0V，The base stage of audion Q2 is connected with control chip U1 pin 11 by resistance R22，The base stage of audion Q4 is connected with control chip U1 pin 11 by resistance R23，The negative electrode of diode D11 is connected with control chip U1 pin 14，The anode of diode D11 is connected to power supply 0V，Audion Q1 colelctor electrode is connected with the pin 1 of isolating transformer T1 and isolating transformer T2 after being connected with audion Q3 colelctor electrode，After audion Q2 colelctor electrode is connected with audion Q4 colelctor electrode，It is connected with the one end after resistance R24 and electric capacity C20 parallel connection，Resistance R24 is connected with the pin 2 of isolating transformer T1 and isolating transformer T2 with the other end after electric capacity C20 parallel connection，Audion Q3 emitter stage is connected to power supply 0V，Audion Q4 emitter stage is connected to power supply 0V，Audion Q1 emitter stage is connected with audion Q2 emitter stage，Diode D15 is in parallel with resistance R25 after connecting with resistance R70，Diode D15 negative electrode is connected with isolating transformer T1 pin 6，The other end of resistance R70 is connected with electric capacity C21 one end，The electric capacity C21 other end is connected with isolating transformer T1 pin 5，Diode D12 is in parallel with resistance R26 after connecting with resistance R29，Diode D12 negative electrode is connected with isolating transformer T1 pin 3，The other end of resistance R29 is connected with electric capacity C22 one end，The electric capacity C22 other end is connected with isolating transformer T1 pin 4，Diode D13 is in parallel with resistance R27 after connecting with resistance R30，Diode D13 negative electrode is connected with isolating transformer T2 pin 6，The other end of resistance R30 is connected with electric capacity C23 one end，The electric capacity C23 other end is connected with isolating transformer T2 pin 5，Diode D14 is in parallel with resistance R28 after connecting with resistance R31，Diode D14 negative electrode is connected with isolating transformer T2 pin 3，The other end of resistance R31 is connected with electric capacity C24 one end，The electric capacity C24 other end is connected with isolating transformer T2 pin 4，Respectively at electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24 two ends obtain four road signals and drive inversion unit，Resistance R54、Diode D2、Optocoupler U6、Resistance R61、R62 component frequency testing circuit 8，Obtain corresponding frequency signal and send into control chip U8，One end of resistance R54 is connected with the U phase of three-phase alternating current，The other end of resistance R54 is connected with the anode of diode D2，The negative electrode of diode D2 is connected with the pin 1 of optocoupler U6，The pin 2 of optocoupler U6 is connected with the V phase of three-phase alternating current，The pin 3 of optocoupler U6 is connected with one end of R61，The other end of R61 is connected to+5V power supply，The pin 3 of optocoupler U6 is connected with one end of R62，The other end of R62 is connected to the pin 9 of control chip U8，In signal processing computing circuit 9, signal processing is exported through resistance R63 by control chip U8、Voltage signal is obtained after electric capacity C4，This signal is by obtaining Setting signal UQG after the voltage follower of the C portion U3C composition of operational amplifier U3，Control chip U8 pin 5 is connected with operational amplifier U3 pin 10 by resistance R63，One end of electric capacity C4 is connected with operational amplifier U3 pin 10，The other end of electric capacity C4 is connected to power supply 0V，Operational amplifier U3 pin 8 is connected with operational amplifier U3 pin 9，The current sensor that circuit is used is current mode current sensor，Resistance R52 obtains voltage through diode D1、Resistance R32、Electric capacity C25、Inductance L5、Resistance R3、Electric capacity C26、The filter network of C27 composition，Obtain required voltage，Receive the end of oppisite phase of part A U2A of operational amplifier U2，Load current is sampled the signal obtained by diode D1 by current sensor U12、Inductance L5、Resistance R3 is connected with operational amplifier U2 pin 2，Diode D1 anode is connected with sensor output，One end of resistance R52 is connected with diode D1 anode，The other end of resistance R52 is connected to power supply 0V，Resistance R32 is connected with diode D1 negative electrode with one end after electric capacity C25 parallel connection，The other end is connected to power supply 0V，Electric capacity C26 one end is connected with inductance L5 and resistance R3 junction，The electric capacity C26 other end is connected to power supply 0V，Electric capacity C27 one end is connected with operational amplifier U2 pin 2，The electric capacity C27 other end is connected to power supply 0V，Resistance R40、Resistance R41、Resistance R42 carries out dividing potential drop to output voltage，Voltage sensor gathers the voltage on resistance R42，The voltage sensor that circuit is used is current mode voltage sensor，Resistance R44 obtains required voltage，This voltage and Setting signal UQG are through by the part B of U3B operational amplifier U3、Resistance R43、Resistance R45、Resistance R46、Resistance R47、Resistance R48、The voltage that the voltage signal obtained after the P actuator of resistance R49 composition obtains after the voltage follower of the part A U3A composition of operational amplifier U3 is by resistance R37、Resistance R38、Resistance R39、Diode D9、Diode D6、Diode D5 discharge and recharge network carries out discharge and recharge to electric capacity C8，Electric capacity C8 obtains to determining voltage signal QG，The outside positive output end of dual-purpose machine passes through resistance R40、Resistance R41 and resistance R42 is connected in series to the outside negative output terminal of dual-purpose machine，Voltage sensor U14 pin 1 is connected with resistance R40 and resistance R42 junction，Voltage sensor U14 pin 2 is connected with resistance R41 and resistance R42 junction，Voltage sensor U14 pin 3 and resistance R44 one end are connected to power supply 0V，Voltage sensor U14 pin 4 is connected with the resistance R44 other end，Voltage sensor U14 pin 4 is connected with operational amplifier U2 pin 6，Voltage sensor U14 pin 4 is connected with operational amplifier U3 pin 6 by resistance R45，Operational amplifier U3 pin 6 is connected with operational amplifier U3 pin 7 by resistance R43，Operational amplifier U3 pin 6 is connected to power supply 0V by resistance R46，Operational amplifier U3 pin 6 is connected to+5V power supply by resistance R48，Operational amplifier U3 pin 5 is connected to power supply 0V by resistance R49，Operational amplifier U3 pin 5 is connected with operational amplifier U3 pin 8 by resistance R48，Operational amplifier U3 pin 7 is connected with operational amplifier U3 pin 3，Operational amplifier U3 pin 1 is connected with operational amplifier U3 pin 2，Resistance R39 is in parallel with resistance R38 after connecting with diode D9，Diode D9 negative electrode is connected with operational amplifier U3 pin 1，The other end of resistance R39 is connected with electric capacity C8 positive pole，Electric capacity C8 negative pole is connected to power supply 0V，Resistance R37 connects with diode D6，The other end of resistance R37 is connected with electric capacity C8 positive pole，Diode D6 negative electrode is connected with operational amplifier U2 pin 1，Diode D5 anode is connected with diode D6 anode，Diode D5 negative electrode is connected with operational amplifier U2 pin 7，Resistance R51、Diode D8 constitutes current protection indicating circuit，Part A U2A of operational amplifier U2 constitutes hysteresis loop comparator with resistance R50，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R34 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output electric current is changed by adjusting resistance R34 value，Resistance R34 pin 1 is connected to+5V power supply，Resistance R34 pin 3 is connected to power supply 0V，Resistance R34 pin 2 is connected with operational amplifier U2 pin 3，Operational amplifier U2 pin 3 is connected with operational amplifier U2 pin 1 by resistance R50，Resistance R51 is connected with diode D8，Diode D8 anode is connected to+5V power supply，The resistance R51 other end is connected with operational amplifier U2 pin 1，Resistance R36、Diode D7 constitutes overvoltage indicating circuit，Part B U2B of operational amplifier U2 constitutes hysteresis loop comparator with resistance R35，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R33 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output voltage is changed by adjusting resistance R33 value，Resistance R33 pin 1 is connected to+5V power supply，Resistance R33 pin 3 is connected to power supply 0V，Resistance R33 pin 2 is connected with operational amplifier U2 pin 5，Operational amplifier U2 pin 5 is connected with operational amplifier U2 pin 7 by resistance R35，Resistance R36 and diode D7，Diode D7 negative electrode is connected with operational amplifier U2 pin 7，The resistance R51 other end is connected to+5V power supply，High frequency transformer primary side current is sampled by the current sensor U11 of sample circuit 10，Load current is sampled by current sensor U12，Load voltage is sampled by voltage sensor U14，Connector J3、Resistance R56、Optocoupler U5、Resistance R59、Resistance R60 forms temperature sampling circuit，Obtain corresponding temperature signal and send into control chip U8，The pin 1 of optocoupler U5 by resistance R56 be connected to ' 12V power supply，The pin 2 of optocoupler U5 is connected with the pin 2 of binding post J3，The pin 1 of binding post J3 be connected to power supply ' 0V，The pin 4 of optocoupler U5 is connected to+5V power supply by resistance R59，The pin 3 of optocoupler U5 is connected to power supply 0V，One end of resistance R60 is connected with the pin 4 of optocoupler U5，One end of resistance R60 is connected with the pin 10 of control chip U8，Programming port J1、Resistance R53、Control chip U8、Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 forms central controller 11，Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 forms clock circuit，Operating clock signals is provided for control chip U8，One end of electric capacity C2 is connected with one end of crystal oscillator Y1，The other end of electric capacity C2 is connected to power supply 0V，One end of electric capacity C3 is connected with the other end of crystal oscillator Y1，The other end of electric capacity C3 is connected to power supply 0V，One end of crystal oscillator Y1 is connected with the pin 2 of control chip U8，The other end of crystal oscillator Y1 is connected with the pin 3 of control chip U8，The pin 1 of programming port J1 is connected with the pin 4 of control chip U8，The pin 2 of programming port J1 is connected to+5V power supply，The pin 3 of programming port J1 is connected to power supply 0V，The pin 4 of programming port J1 is connected with the pin 13 of control chip U8，The pin 5 of programming port J1 is connected with the pin 12 of control chip U8，Switching circuit 12 is by relay K 1、Diode D3、Inductance L6、Inductance L7、Audion Q5、Resistance R65、Connector J4、Connector J5、Setting signal is switched over by connector J6，By resistance R64、Optocoupler U7、Resistance R66、Diode D4、Relay K 2、Audion Q6、Main transformer is switched over by connector J7，The pin 6 of control chip U8 is connected with one end of resistance R65，The other end of resistance R65 is connected with audion Q5 base stage，Audion Q5 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to+15V power supply by inductance L6，The coil of relay K 1 is in parallel with diode D3，Audion Q5 emitter stage is connected to power supply 0V by inductance L7，The pin 1 of relay K 1 is connected with the pin 2 of binding post J4，The pin 4 of relay K 1 is connected with the pin 1 of binding post J4，The pin 2 of relay K 1 is connected with the pin 1 of binding post J5，The pin 5 of relay K 1 is connected with the pin 2 of binding post J5，The pin 3 of relay K 1 is connected with the pin 1 of binding post J6，The pin 6 of relay K 1 is connected with the pin 2 of binding post J6，The pin 7 of control chip U8 is connected with the pin 2 of optocoupler U7，The pin 1 of optocoupler U7 is connected to+5V power supply by resistance R64，The pin 3 of optocoupler U7 is connected to ' 12V power supply,The pin 4 of optocoupler U7 is connected to audion Q6 base stage by resistance R66，Audion Q6 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to ' 12V power supply，The coil of relay K 2 is in parallel with diode D4，Audion Q6 emitter stage be connected to power supply ' 0V，The pin 4 of relay K 1 is connected to ' 12V power supply，The pin 6 of relay K 1 is connected with the pin 1 of binding post J7，The pin 2 of binding post J7 be connected to power supply ' 0V，Connector J2、Resistance R55、Optocoupler U4、Resistance R57、Resistance R58 forms multi-functional conversion input circuit 13，Obtain corresponding mode signal and send into control chip U8，The pin 1 of optocoupler U4 by resistance R55 be connected to ' 12V power supply，The pin 2 of optocoupler U4 is connected with the pin 2 of binding post J2，The pin 1 of binding post J2 be connected to power supply ' 0V，The pin 4 of optocoupler U4 is connected to+5V power supply by resistance R57，The pin 3 of optocoupler U4 is connected to power supply 0V，One end of resistance R58 is connected with the pin 4 of optocoupler U4，One end of resistance R58 is connected with the pin 11 of control chip U8.Said structure has stable, failure rate is low, control accuracy height, the advantage of relative inexpensiveness.

The present invention is for the ease of carrying, following structure can be used: main circuit and control circuit are installed in housing 14, housing 14 is rectangle, handle 22 is installed in one side of housing 14, arranging master switch 15, function switching switch 16 on one end face of housing, welding current adjusts knob 17, striking current adjusts knob 18, joints made by electric welding 19, motor drive sub 20 and three-phase alternating current out splice going splice 21.Whole circuit blocks are made an entirety by this structure, it is simple to form moveable welding equipment with walking chassis and the welding equipment direct-assembling of existing DC motor Driver.

Function switching switch 16 is two-wire switching, is connected with the connector J2 of " dual-purpose machine " circuit for controlling motor plate.Welding current adjusts knob 17 and striking current adjusts knob 18 and is three line knobs, and welding current adjusts knob 17 and striking current adjusts knob 18 and is configured direct-current arc welding operating characteristic.When using " electric welding field " operating mode, function switching switch 16 is threaded to " electric welding field " gear, uses electric welding socket to export；When using " motor driving " operating mode, function switch is threaded to " motor driving " gear, uses motor driven socket to export.

When function switching switch 16 is threaded to " electric welding field " gear, control chip U8 obtains corresponding mode signal by multi-functional conversion input circuit, and control chip U8 controls switching circuit and switches over Setting signal and main transformer.The Setting signal meeting direct-current arc welding operating characteristic is made to send into high-frequency signal generation circuit, meet the primary transformer coil access main circuit of " electric welding field " operating mode.

When function switching switch 16 is threaded to " motor driving " gear, control chip U8 obtains corresponding mode signal by multi-functional conversion input circuit, and control chip U8 controls switching circuit and switches over Setting signal and main transformer.The Setting signal meeting motor drive operational characteristic is made to send into high-frequency signal generation circuit, meet the primary transformer coil access main circuit of " motor driving " operating mode.

In figure, 23 is load.

Claims (1)

1. null1. direct-current arc welding、The dual-purpose machine of DC motor Driver，It is characterized in that: include main circuit and control circuit，Main circuit includes commutator (1)，The outfan of commutator (1) is connected with the input of wave filter (2)，The outfan of wave filter (2) is connected with the input of inversion unit (3)，The outfan of inversion unit (3) is connected with the input of high frequency main transformer (4)，The outfan of high frequency main transformer (4) is connected with the input of hf rectifier (5)，The outfan of hf rectifier (5) is connected with the input of high frequency filter (6)，Control circuit includes high-frequency signal generation circuit (7)、Frequency detection circuit (8)、Signal processing computing circuit (9)、Sample circuit (10)、Central controller (11)、Switching circuit (12)、Multi-functional conversion input circuit (13)，The annexation of main circuit and control circuit is as follows: commutator (1) is by the voltage of input、The three-phase alternating current of changeable frequency is rectified into unidirectional current by after commutator U9，Wave filter (2) is by electric capacity C1、Electric capacity C5、Electric capacity C6 and resistance R1、Resistance R2 forms，Electric capacity C1 is Absorption Capacitance，C5、C6 is filter capacitor，R1、R2 is equalizing resistance，One end of electric capacity C1 is connected with the positive output end of commutator U9，The other end is connected with the negative output terminal of commutator U9，Resistance R1 is in parallel with electric capacity C5，Resistance R2 is in parallel with electric capacity C6，Electric capacity C5 positive pole is connected with one end of electric capacity C1，Electric capacity C5 negative pole is connected with electric capacity C6 positive pole，Electric capacity C6 negative pole is connected with the other end of electric capacity C1，The unidirectional current of input is passed through inversion unit U10 inverter output frequency 10 ~ 100kHz high-frequency alternating current by inversion unit (3)，High frequency main transformer (4) is by high frequency transformer T3、D.C. contactor K3 and binding post J8 composition，Binding post J8 is D.C. contactor K3 coil outer binding post，The number of turn of high frequency transformer T3 is realized changing by controlling D.C. contactor K3，High frequency transformer T3 is by the winding I of primary side、Winding II and one winding of secondary side are constituted，Two windings in series of the primary side of high frequency transformer T3，The other end of first side winding I exchanges outlet side one end and is connected with inversion unit U10，The other end of first side winding II exchanges the outlet side other end and is connected with inversion unit U10，The normally opened contact of D.C. contactor K3 is in parallel with first side winding II，The coil two ends of D.C. contactor K3 are connected respectively to pin 1 and the pin 2 of binding post J8，The secondary side winding two ends of high frequency transformer T3 export，The alternating current that secondary side winding two ends are obtained by high frequency transformer T3 exports unidirectional current by hf rectifier (5) U13 rectification，High frequency filter (6) is made up of inductance L4 and electric capacity C7，One end of inductance L4 is connected with the positive output end of hf rectifier U13，The other end of inductance L4 is connected with the positive pole of electric capacity C7，The negative pole of electric capacity C7 is connected with the negative output terminal of hf rectifier U13，The outside positive output end of dual-purpose machine is connected with the positive pole of electric capacity C7，The outside negative output terminal of dual-purpose machine is connected with the negative pole of electric capacity C7，The pin 1 of the power module U15 of high-frequency signal generation circuit (7) be connected to power supply ' 12V，The pin 2 of power module U15 be connected to power supply ' 0V，Power supply-15V is obtained on the pin 3 of power module U15，The pin 4 of power module U15 is connected to 0V power supply，Power supply+15V is obtained on the pin 5 of power module U15，Electric capacity C41 connects with electric capacity C42，The negative pole of electric capacity C41 is connected with the pin 3 of power module U15，The positive pole of electric capacity C41 is connected with the pin 4 of power module U15，The positive pole of electric capacity C42 is connected with the pin 5 of power module U15，Electric capacity C44 is in parallel with electric capacity C41，Electric capacity C43 is in parallel with electric capacity C42，The pin 1 of power module U16 is connected to power supply+15V，The pin 2 of power module U16 is connected to power supply 0V，The positive pole of electric capacity C46 is connected with the pin 3 of power module U16，The negative pole of electric capacity C46 is connected to power supply 0V，Electric capacity C45 is in parallel with electric capacity C46，To determining voltage signal QG through electric capacity C9、Electric capacity C10、Resistance R4、Resistance R5、Operational amplifier U15、Resistance R6、The filter network of electric capacity C11 composition is to 5 feet of control chip U1，Setting signal is provided for control chip U1 work，One end of resistance R4 is connected with electric capacity C9，The electric capacity C9 other end is connected to power supply 0V，The other end of resistance R4 is connected with the in-phase input end of operational amplifier U15，Resistance R5 is connected with the in-phase input end of operational amplifier U15 with one end after electric capacity C10 parallel connection，The other end is connected to power supply 0V，The inverting input of operational amplifier U15 is connected with outfan，It is connected to control chip U1 pin 5 by resistance R6，The pin 5 of control chip U1 is connected with electric capacity C11 one end，The electric capacity C11 other end is connected to power supply 0V，Resistance R7、Resistance R8、Electric capacity C28、Electric capacity C29 makes control chip U1 work can soft start，Resistance R8 is in parallel with electric capacity C29，The positive pole of electric capacity C29 and control chip U1 pin 1，The negative pole of electric capacity C29 is connected to power supply 0V，Resistance R7 connects with electric capacity C28，The negative pole of electric capacity C28 is connected to power supply 0V，The positive pole of electric capacity C29 and control chip U1 pin 2，The other end of resistance R7 is connected with control chip U1 pin 1，High frequency transformer primary side current is carried out sampling gained signal through resistance R14 by current sensor U11、Resistance R15、Resistance R16、Resistance R17、The filter network of electric capacity C18 composition is to 4 feet of control chip U1，Setting signal is provided for control chip U1 work，Resistance R16 connects with resistance R17，The other end of resistance R17 is connected with the output of current sensor U11，The other end of resistance R16 is connected with control chip U1 pin 4，Control chip U1 pin 4 is connected to-15V power supply by resistance R14，Control chip U1 pin 4 is connected to power supply 0V by resistance R15，Harmonic compensation electricity routing resistance R11、Resistance R12、Electric capacity C15、Electric capacity C16、Operational amplifier U16 forms，The in-phase input end of operational amplifier U16 is connected with control chip U1 pin 8，The inverting input of operational amplifier U16 is connected with outfan，Resistance R11、Electric capacity C16 is in parallel with resistance R12 and electric capacity C15 after connecting，Electric capacity C15 one end is connected with control chip U1 pin 4，The electric capacity C15 other end is connected with operational amplifier U16 outfan，Concussion timing circuit is by resistance R9、Resistance R10、Electric capacity C12、Electric capacity C14 forms，Resistance R9 is in parallel with resistance R10，One end is connected with control chip U1 pin 8，The other end is connected to power supply 0V，Electric capacity C12 is in parallel with electric capacity C14，One end is connected with control chip U1 pin 9，The other end is connected to power supply 0V，High frequency transformer primary side current is carried out sampling gained signal through resistance R17 by current sensor U11、Resistance R18、Resistance R19、Electric capacity C18、Electric capacity C19 provides outside for control chip U1 and turns off，Resistance R17 and resistance R18 is connected in series to control chip U1 pin 16，Resistance R19 is in parallel with electric capacity C19，One end is connected with control chip U1 pin 16，The other end is connected to power supply 0V，Resistance R13 is the protective resistance of control chip U1 output stage biased voltage input，Electric capacity C13、Electric capacity C17、Electric capacity C30、Electric capacity C31 is filter capacitor，Resistance R13 one end is connected with control chip U1 pin 15，The resistance R13 other end is connected with control chip U1 pin 13，Electric capacity C13 is in parallel with electric capacity C30，One end is connected with control chip U1 pin 15，The other end is connected to power supply 0V，Electric capacity C17 is in parallel with electric capacity C31，One end is connected with control chip U1 pin 13，The other end is connected to power supply 0V，By diode D10、Diode D11、Resistance R20、Resistance R21、Resistance R22、Resistance R23、Audion Q1、Audion Q2、Audion Q3、Audion Q4、Resistance R24、Electric capacity C20 forms full-bridge circuit，Two paths of signals is through isolating transformer T1、Isolating transformer T2、Electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24、Resistance R25、Resistance R26、Resistance R27、Resistance R28、Resistance R29、Resistance R30、Resistance R31、Resistance R70、Diode D12、Diode D13、Diode D14、Diode D15 becomes four road signals and drives inversion unit，The base stage of audion Q1 is connected with control chip U1 pin 14 by resistance R20，The base stage of audion Q3 is connected with control chip U1 pin 14 by resistance R21，The negative electrode of diode D10 is connected with control chip U1 pin 14，The anode of diode D10 is connected to power supply 0V，The base stage of audion Q2 is connected with control chip U1 pin 11 by resistance R22，The base stage of audion Q4 is connected with control chip U1 pin 11 by resistance R23，The negative electrode of diode D11 is connected with control chip U1 pin 14，The anode of diode D11 is connected to power supply 0V，Audion Q1 colelctor electrode is connected with the pin 1 of isolating transformer T1 and isolating transformer T2 after being connected with audion Q3 colelctor electrode，After audion Q2 colelctor electrode is connected with audion Q4 colelctor electrode，It is connected with the one end after resistance R24 and electric capacity C20 parallel connection，Resistance R24 is connected with the pin 2 of isolating transformer T1 and isolating transformer T2 with the other end after electric capacity C20 parallel connection，Audion Q3 emitter stage is connected to power supply 0V，Audion Q4 emitter stage is connected to power supply 0V，Audion Q1 emitter stage is connected with audion Q2 emitter stage，Diode D15 is in parallel with resistance R25 after connecting with resistance R70，Diode D15 negative electrode is connected with isolating transformer T1 pin 6，The other end of resistance R70 is connected with electric capacity C21 one end，The electric capacity C21 other end is connected with isolating transformer T1 pin 5，Diode D12 is in parallel with resistance R26 after connecting with resistance R29，Diode D12 negative electrode is connected with isolating transformer T1 pin 3，The other end of resistance R29 is connected with electric capacity C22 one end，The electric capacity C22 other end is connected with isolating transformer T1 pin 4，Diode D13 is in parallel with resistance R27 after connecting with resistance R30，Diode D13 negative electrode is connected with isolating transformer T2 pin 6，The other end of resistance R30 is connected with electric capacity C23 one end，The electric capacity C23 other end is connected with isolating transformer T2 pin 5，Diode D14 is in parallel with resistance R28 after connecting with resistance R31，Diode D14 negative electrode is connected with isolating transformer T2 pin 3，The other end of resistance R31 is connected with electric capacity C24 one end，The electric capacity C24 other end is connected with isolating transformer T2 pin 4，Respectively at electric capacity C21、Electric capacity C22、Electric capacity C23、Electric capacity C24 two ends obtain four road signals and drive inversion unit，Resistance R54、Diode D2、Optocoupler U6、Resistance R61、R62 component frequency testing circuit (8)，Obtain corresponding frequency signal and send into control chip U8，One end of resistance R54 is connected with the U phase of three-phase alternating current，The other end of resistance R54 is connected with the anode of diode D2，The negative electrode of diode D2 is connected with the pin 1 of optocoupler U6，The pin 2 of optocoupler U6 is connected with the V phase of three-phase alternating current，The pin 3 of optocoupler U6 is connected with one end of R61，The other end of R61 is connected to+5V power supply，The pin 3 of optocoupler U6 is connected with one end of R62，The other end of R62 is connected to the pin 9 of control chip U8，In signal processing computing circuit (9), signal processing is exported through resistance R63 by control chip U8、Voltage signal is obtained after electric capacity C4，This signal is by obtaining Setting signal UQG after the voltage follower of the C portion U3C composition of operational amplifier U3，Control chip U8 pin 5 is connected with operational amplifier U3 pin 10 by resistance R63，One end of electric capacity C4 is connected with operational amplifier U3 pin 10，The other end of electric capacity C4 is connected to power supply 0V，Operational amplifier U3 pin 8 is connected with operational amplifier U3 pin 9，The current sensor that circuit is used is current mode current sensor，Resistance R52 obtains voltage through diode D1、Resistance R32、Electric capacity C25、Inductance L5、Resistance R3、Electric capacity C26、The filter network of C27 composition，Obtain required voltage，Receive the end of oppisite phase of part A U2A of operational amplifier U2，Load current is sampled the signal obtained by diode D1 by current sensor U12、Inductance L5、Resistance R3 is connected with operational amplifier U2 pin 2，Diode D1 anode is connected with sensor output，One end of resistance R52 is connected with diode D1 anode，The other end of resistance R52 is connected to power supply 0V，Resistance R32 is connected with diode D1 negative electrode with one end after electric capacity C25 parallel connection，The other end is connected to power supply 0V，Electric capacity C26 one end is connected with inductance L5 and resistance R3 junction，The electric capacity C26 other end is connected to power supply 0V，Electric capacity C27 one end is connected with operational amplifier U2 pin 2，The electric capacity C27 other end is connected to power supply 0V，Resistance R40、Resistance R41、Resistance R42 carries out dividing potential drop to output voltage，Voltage sensor gathers the voltage on resistance R42，The voltage sensor that circuit is used is current mode voltage sensor，Resistance R44 obtains required voltage，This voltage and Setting signal UQG are through by the part B of U3B operational amplifier U3、Resistance R43、Resistance R45、Resistance R46、Resistance R47、Resistance R48、The voltage that the voltage signal obtained after the P actuator of resistance R49 composition obtains after the voltage follower of the part A U3A composition of operational amplifier U3 is by resistance R37、Resistance R38、Resistance R39、Diode D9、Diode D6、Diode D5 discharge and recharge network carries out discharge and recharge to electric capacity C8，Electric capacity C8 obtains to determining voltage signal QG，The outside positive output end of dual-purpose machine passes through resistance R40、Resistance R41 and resistance R42 is connected in series to the outside negative output terminal of dual-purpose machine，Voltage sensor U14 pin 1 is connected with resistance R40 and resistance R42 junction，Voltage sensor U14 pin 2 is connected with resistance R41 and resistance R42 junction，Voltage sensor U14 pin 3 and resistance R44 one end are connected to power supply 0V，Voltage sensor U14 pin 4 is connected with the resistance R44 other end，Voltage sensor U14 pin 4 is connected with operational amplifier U2 pin 6，Voltage sensor U14 pin 4 is connected with operational amplifier U3 pin 6 by resistance R45，Operational amplifier U3 pin 6 is connected with operational amplifier U3 pin 7 by resistance R43，Operational amplifier U3 pin 6 is connected to power supply 0V by resistance R46，Operational amplifier U3 pin 6 is connected to+5V power supply by resistance R48，Operational amplifier U3 pin 5 is connected to power supply 0V by resistance R49，Operational amplifier U3 pin 5 is connected with operational amplifier U3 pin 8 by resistance R48，Operational amplifier U3 pin 7 is connected with operational amplifier U3 pin 3，Operational amplifier U3 pin 1 is connected with operational amplifier U3 pin 2，Resistance R39 is in parallel with resistance R38 after connecting with diode D9，Diode D9 negative electrode is connected with operational amplifier U3 pin 1，The other end of resistance R39 is connected with electric capacity C8 positive pole，Electric capacity C8 negative pole is connected to power supply 0V，Resistance R37 connects with diode D6，The other end of resistance R37 is connected with electric capacity C8 positive pole，Diode D6 negative electrode is connected with operational amplifier U2 pin 1，Diode D5 anode is connected with diode D6 anode，Diode D5 negative electrode is connected with operational amplifier U2 pin 7，Resistance R51、Diode D8 constitutes current protection indicating circuit，Part A U2A of operational amplifier U2 constitutes hysteresis loop comparator with resistance R50，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R34 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output electric current is changed by adjusting resistance R34 value，Resistance R34 pin 1 is connected to+5V power supply，Resistance R34 pin 3 is connected to power supply 0V，Resistance R34 pin 2 is connected with operational amplifier U2 pin 3，Operational amplifier U2 pin 3 is connected with operational amplifier U2 pin 1 by resistance R50，Resistance R51 is connected with diode D8，Diode D8 anode is connected to+5V power supply，The resistance R51 other end is connected with operational amplifier U2 pin 1，Resistance R36、Diode D7 constitutes overvoltage indicating circuit，Part B U2B of operational amplifier U2 constitutes hysteresis loop comparator with resistance R35，When anti-phase input terminal voltage is more than in-phase input end voltage，I.e. on R33 obtained by voltage time，Outfan is electronegative potential，When anti-phase input terminal voltage is less than in-phase input end voltage，Outfan is high potential，The protection value of output voltage is changed by adjusting resistance R33 value，Resistance R33 pin 1 is connected to+5V power supply，Resistance R33 pin 3 is connected to power supply 0V，Resistance R33 pin 2 is connected with operational amplifier U2 pin 5，Operational amplifier U2 pin 5 is connected with operational amplifier U2 pin 7 by resistance R35，Resistance R36 and diode D7，Diode D7 negative electrode is connected with operational amplifier U2 pin 7，The resistance R51 other end is connected to+5V power supply，High frequency transformer primary side current is sampled by the current sensor U11 of sample circuit (10)，Load current is sampled by current sensor U12，Load voltage is sampled by voltage sensor U14，Connector J3、Resistance R56、Optocoupler U5、Resistance R59、Resistance R60 forms temperature sampling circuit，Obtain corresponding temperature signal and send into control chip U8，The pin 1 of optocoupler U5 by resistance R56 be connected to ' 12V power supply，The pin 2 of optocoupler U5 is connected with the pin 2 of binding post J3，The pin 1 of binding post J3 be connected to power supply ' 0V，The pin 4 of optocoupler U5 is connected to+5V power supply by resistance R59，The pin 3 of optocoupler U5 is connected to power supply 0V，One end of resistance R60 is connected with the pin 4 of optocoupler U5，One end of resistance R60 is connected with the pin 10 of control chip U8，Programming port J1、Resistance R53、Control chip U8、Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 composition central controller (11)，Electric capacity C2、Electric capacity C3、Crystal oscillator Y1 forms clock circuit，Operating clock signals is provided for control chip U8，One end of electric capacity C2 is connected with one end of crystal oscillator Y1，The other end of electric capacity C2 is connected to power supply 0V，One end of electric capacity C3 is connected with the other end of crystal oscillator Y1，The other end of electric capacity C3 is connected to power supply 0V，One end of crystal oscillator Y1 is connected with the pin 2 of control chip U8，The other end of crystal oscillator Y1 is connected with the pin 3 of control chip U8，The pin 1 of programming port J1 is connected with the pin 4 of control chip U8，The pin 2 of programming port J1 is connected to+5V power supply，The pin 3 of programming port J1 is connected to power supply 0V，The pin 4 of programming port J1 is connected with the pin 13 of control chip U8，The pin 5 of programming port J1 is connected with the pin 12 of control chip U8，Switching circuit (12) passes through relay K 1、Diode D3、Inductance L6、Inductance L7、Audion Q5、Resistance R65、Connector J4、Connector J5、Setting signal is switched over by connector J6，By resistance R64、Optocoupler U7、Resistance R66、Diode D4、Relay K 2、Audion Q6、Main transformer is switched over by connector J7，The pin 6 of control chip U8 is connected with one end of resistance R65，The other end of resistance R65 is connected with audion Q5 base stage，Audion Q5 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to+15V power supply by inductance L6，The coil of relay K 1 is in parallel with diode D3，Audion Q5 emitter stage is connected to power supply 0V by inductance L7，The pin 1 of relay K 1 is connected with the pin 2 of binding post J4，The pin 4 of relay K 1 is connected with the pin 1 of binding post J4，The pin 2 of relay K 1 is connected with the pin 1 of binding post J5，The pin 5 of relay K 1 is connected with the pin 2 of binding post J5，The pin 3 of relay K 1 is connected with the pin 1 of binding post J6，The pin 6 of relay K 1 is connected with the pin 2 of binding post J6，The pin 7 of control chip U8 is connected with the pin 2 of optocoupler U7，The pin 1 of optocoupler U7 is connected to+5V power supply by resistance R64，The pin 3 of optocoupler U7 is connected to ' 12V power supply,The pin 4 of optocoupler U7 is connected to audion Q6 base stage by resistance R66，Audion Q6 colelctor electrode is connected with the anode of diode D3，The negative electrode of diode D3 is connected to ' 12V power supply，The coil of relay K 2 is in parallel with diode D4，Audion Q6 emitter stage be connected to power supply ' 0V，The pin 4 of relay K 1 is connected to ' 12V power supply，The pin 6 of relay K 1 is connected with the pin 1 of binding post J7，The pin 2 of binding post J7 be connected to power supply ' 0V，Connector J2、Resistance R55、Optocoupler U4、Resistance R57、Resistance R58 forms multi-functional conversion input circuit (13)，Obtain corresponding mode signal and send into control chip U8，The pin 1 of optocoupler U4 by resistance R55 be connected to ' 12V power supply，The pin 2 of optocoupler U4 is connected with the pin 2 of binding post J2，The pin 1 of binding post J2 be connected to power supply ' 0V，The pin 4 of optocoupler U4 is connected to+5V power supply by resistance R57，The pin 3 of optocoupler U4 is connected to power supply 0V，One end of resistance R58 is connected with the pin 4 of optocoupler U4，One end of resistance R58 is connected with the pin 11 of control chip U8，Main circuit and control circuit are installed in housing (14)，Housing (14) is rectangle，Handle (22) is installed in one side of housing (14)，On one end face of housing, master switch (15) is set、Function switching switch (16)，Welding current adjusts knob (17)、Striking current adjusts knob (18)、Joints made by electric welding (19)、Motor drive sub (20) and three-phase alternating current out splice going splice (21).