阅读说明：本技术 一种中频永磁发电焊机前级预稳压系统 (Pre-stage voltage stabilizing system of intermediate-frequency permanent magnet power generation welding machine ) 是由 冯文联 谢传波 胡洲 于 2019-10-08 设计创作，主要内容包括：本发明公开一种中频永磁发电焊机前级预稳压系统,包括三相交流发电机、预稳压整流电路、三相电压采样电路、控制器、电焊变频单元以及发电变频单元；三相交流发电机的电压输出端与预稳压整流电路的电压输入端连接,预稳压整流电路的电压输出端分别与电焊变频单元和发电变频单元的电压输入端连接,三相交流发电机的三相电压输出端连接三相电压采样电路的三相电压输入端,三相电压采样电路的电压输出端连接控制器的电压输入端,控制器的控制输出端与预稳压整流电路的控制输入端连接。本发明通过控制器调整预稳压整流电路中可控硅的导通角,以输出稳定的电压,避免了电焊和发电单元之间的电磁干扰,提高了工作效率。(the invention discloses a pre-stage pre-voltage-stabilizing system of an intermediate-frequency permanent magnet power generation welding machine, which comprises a three-phase alternating-current generator, a pre-voltage-stabilizing rectification circuit, a three-phase voltage sampling circuit, a controller, an electric welding frequency conversion unit and a power generation frequency conversion unit, wherein the pre-voltage-stabilizing rectification circuit is connected with the three-phase voltage sampling circuit; the voltage output end of the three-phase alternating-current generator is connected with the voltage input end of the pre-voltage-stabilizing rectification circuit, the voltage output end of the pre-voltage-stabilizing rectification circuit is connected with the voltage input ends of the electric welding frequency conversion unit and the power generation frequency conversion unit respectively, the three-phase voltage output end of the three-phase alternating-current generator is connected with the three-phase voltage input end of the three-phase voltage sampling circuit, the voltage output end of the three-phase voltage sampling circuit is connected with the voltage input end of the controller, and the control output end of the controller is. The invention adjusts the conduction angle of the controlled silicon in the pre-voltage-stabilizing rectification circuit through the controller to output stable voltage, thereby avoiding the electromagnetic interference between the electric welding and the power generation unit and improving the working efficiency.)

1. A pre-stage voltage pre-stabilizing system of an intermediate frequency permanent magnet power generation welding machine comprises an electric welding frequency conversion unit and a power generation frequency conversion unit, and is characterized by comprising a three-phase alternating current generator, a pre-voltage stabilizing rectification circuit, a three-phase voltage sampling circuit and a controller;

the three-phase voltage output end of the three-phase alternating current generator is respectively connected with the three-phase voltage input end of the pre-voltage-stabilizing rectification circuit and the three-phase voltage input end of the three-phase voltage sampling circuit, the three-phase voltage output end of the three-phase voltage sampling circuit is connected with the controller, the signal regulation output end of the controller is connected with the signal regulation input end of the pre-voltage-stabilizing rectification circuit, and the output end of the pre-voltage-stabilizing rectification circuit is respectively connected with the input end of the electric welding frequency conversion unit and the input end of the power generation.

2. The forestage pre-voltage-stabilizing system of the intermediate-frequency permanent magnet power generation welding machine as claimed in claim 1, wherein the three-phase voltage sampling circuit comprises operational amplifiers U1, U2, U3 and a three-phase voltage input end A, B, C:

the A end is connected with one end of a first resistor (R1), the other end of the first resistor (R1) is connected with one end of a second resistor (R2), the other end of the second resistor (R2) is connected with the non-inverting input end of an operational amplifier U1, the other end of the second resistor (R2) is connected with one end of a third resistor (R3) and one end of a first capacitor (C1) respectively, and the other end of the third resistor (R3) is connected with the other end of the first capacitor (C1) in parallel and then grounded; an inverting input end of the operational amplifier U1 is respectively connected with one end of a fourth resistor (R4), one end of a sixth resistor (R6) and one end of a third capacitor (C3), the other end of the fourth resistor (R4) is connected with one end of a fifth resistor (R5), and the other end of the fifth resistor (R5) is grounded; the other end of the sixth resistor (R6) and the other end of the third capacitor (C3) are connected in parallel and then connected with the output end of the operational amplifier U1, the output end of the operational amplifier U1 is also connected with one end of a seventh resistor (R7), the other end of the seventh resistor (R7) is respectively connected with an ADC _ DC port of the controller and one end of a fourth capacitor (C4), and the other end of the fourth capacitor (C4) is grounded; the positive power supply end of the operational amplifier U1 is respectively connected with one end of a first power supply and one end of a second capacitor (C2), and the other end of the second capacitor (C2) is grounded; the negative power supply end of the operational amplifier U1 is grounded;

The B end is connected with one end of an eighth resistor (R8), the other end of the eighth resistor (R8) is connected with one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with the non-inverting input end of an operational amplifier U2, the other end of the ninth resistor (R9) is further connected with one end of a tenth resistor (R10) and one end of a fifth capacitor (C5) respectively, and the other end of the tenth resistor (R10) and the other end of the fifth capacitor (C5) are connected with a second power supply after being connected in parallel; the inverting input end of the operational amplifier U2 is respectively connected with the output end of the U2 and one end of an eleventh resistor (R11), and the other end of the eleventh resistor (R11) is connected with the non-inverting input end of the operational amplifier U3; the output end of the operational amplifier U2 is further connected with one end of a fifteenth resistor (R15), the other end of the fifteenth resistor (R15) is respectively connected with an ADC _ AC _ U port of the controller and one end of a seventh capacitor (C7), and the other end of the seventh capacitor (C7) is grounded; the positive power supply end of the operational amplifier U2 is respectively connected with a third power supply and one end of a sixth capacitor (C6), and the other end of the sixth capacitor (C6) is grounded; the negative power supply end of the operational amplifier U2 is grounded;

The end C is connected with one end of a twelfth resistor (R12), the other end of the twelfth resistor (R12) is connected with the inverting input end of an operational amplifier U3, the inverting input end of the operational amplifier U3 is also connected with one end of a thirteenth resistor (R13) and one end of an eighth capacitor (C8) respectively, the other end of the thirteenth resistor (R13) and the other end of the eighth capacitor (C8) are connected with the output end of the operational amplifier U3 after being connected in parallel, the output end of the operational amplifier U3 is also connected with one end of a fourteenth resistor (R14), the other end of the fourteenth resistor (R14) is connected with the ZERO _ PLUS _ M port of the controller and one end of a ninth capacitor (C9) respectively, and the other end of the ninth capacitor (C9) is grounded; the positive power supply end of the operational amplifier U3 is connected with the fourth power supply, and the negative power supply end of the operational amplifier U3 is grounded.

3. the forestage pre-voltage-stabilizing system of the intermediate-frequency permanent magnet power generation welding machine as claimed in claim 1, wherein the pre-voltage-stabilizing rectification circuit comprises an optical coupler and a silicon controlled rectifier:

the control output end of the controller is connected with one end of a sixteenth resistor (R16), the other end of the sixteenth resistor (R16) is connected with the anode of the input end of the optical coupler, and the cathode of the input end of the optical coupler is grounded; a collector of an output end of the optocoupler is respectively connected with an emitter of the first triode (Q1), one end of an eighteenth resistor (R18) and one end of a nineteenth resistor (R19), an emitter of the output end of the optocoupler is respectively connected with a base level of the first triode (Q1) and one end of a seventeenth resistor (R17), and the other end of the seventeenth resistor (R17) and the other end of the eighteenth resistor (R18) are respectively connected with a collector of the second triode (Q2); the other end of the nineteenth resistor (R19) is respectively connected with one end of a twentieth resistor (R20), the negative electrode of the first diode (D1) and one end of a tenth capacitor (C10), the other end of the twentieth resistor (R20) is connected with one end of a twenty-first resistor (R21), the other end of the twenty-first resistor (R21) is respectively connected with one end of a twenty-second resistor (R22), one end of a twenty-fourth resistor (R24), one end of an eleventh capacitor (C11) and the base level of a second triode (Q2), the other end of the twenty-second resistor (R22) is connected with one end of a twenty-third resistor (R23), and the other end of the twenty-third resistor (R23) is grounded; the other end of the tenth capacitor (C10), the anode of the first diode (D1), the other end of the twenty-fourth resistor (R24) and the other end of the eleventh capacitor (C11) are connected in parallel and then connected with the emitter of the second triode (Q2);

The emitter of the second triode (Q2) is also respectively connected with one end of a twenty-fifth resistor (R25), one end of a twenty-sixth resistor (R26), one end of a twelfth capacitor (C12), one end of a thirteenth capacitor (C13) and one end of a fourteenth capacitor (C14), the other end of the twenty-fifth resistor (R25) and the other end of the twenty-sixth resistor (R26) are connected in parallel and then respectively connected with the collector of the first triode (Q1), one end of a twenty-seventh resistor (R27), one end of a twenty-eighth resistor (R28) and one end of a twenty-ninth resistor (R29), the other end of the twenty-seventh resistor (R27) is respectively connected with the other end of the twelfth capacitor (C12) and the cathode of the third thyristor (S3), the other end of the twenty-eighth resistor (R28) is respectively connected with the other end of the thirteenth capacitor (C13) and the cathode of the second thyristor (S2), and the other end of the fourteenth resistor (R14) is respectively connected with the cathode of the fourteenth capacitor (R1) ) The anode of the first thyristor (S1), the anode of the second thyristor (S2) and the anode of the third thyristor (S3) are respectively connected with the three-phase voltage output end of the three-phase alternating-current generator; a control electrode of the first controllable silicon (S1), a control electrode of the second controllable silicon (S2) and a control electrode of the third controllable silicon (S3) are connected in parallel and then are connected with a fifth power supply; the anode of the second diode (D2), the anode of the third diode (D3) and the anode of the fourth diode (D4) are respectively connected with the three-phase voltage output end of the three-phase alternating-current generator, and the cathode of the second diode (D2), the cathode of the third diode (D3) and the cathode of the fourth diode (D4) are connected in parallel and then connected with the external module.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a pre-voltage-stabilizing system for a front stage of an intermediate-frequency permanent magnet power generation welding machine.

background

Along with the rapid development of society and industry, the market prospect of the equipment that only possesses single function is littleer and more, therefore the demand of multi-functional equipment is bigger and bigger, for example with the power generation function and the electric welding function integration to integrative equipment, not only portable can also adapt to different operational environment demands.

when circuits among different functional units are integrated on one device, the voltage supplied to a main loop of a welding unit fluctuates due to the fluctuation of the rotating speed of an engine, the fluctuation range is from DC300 to 600 volts, and the signal conduction among the circuits has mutual electromagnetic interference to influence the stability of output voltage, thereby bringing great inconvenience to work.

disclosure of Invention

The invention provides a pre-voltage stabilizing system of a front stage of a medium-frequency (600Hz) permanent magnet power generation welding machine, aiming at the problem of mutual electromagnetic interference between variable-frequency power generation and electric welding in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

A pre-stage voltage stabilizing system of an intermediate frequency permanent magnet power generation welding machine comprises an electric welding frequency conversion unit, a power generation frequency conversion unit, a three-phase alternating current generator, a pre-voltage stabilizing rectification circuit, a three-phase voltage sampling circuit and a controller;

The three-phase voltage output end of the three-phase alternating current generator is respectively connected with the three-phase voltage input end of the pre-voltage-stabilizing rectification circuit and the three-phase voltage input end of the three-phase voltage sampling circuit, the three-phase voltage output end of the three-phase voltage sampling circuit is connected with the controller, the signal regulation output end of the controller is connected with the signal regulation input end of the pre-voltage-stabilizing rectification circuit, and the output end of the pre-voltage-stabilizing rectification circuit is respectively connected with the input end of the electric welding frequency conversion unit and the input end of the power generation.

Preferably, the three-phase voltage sampling circuit comprises operational amplifiers U1, U2, U3 and a three-phase voltage input terminal A, B, C:

The A end is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor, the other end of the second resistor is connected with the non-inverting input end of an operational amplifier U1, the other end of the second resistor is also connected with one end of a third resistor and one end of a first capacitor respectively, and the other end of the third resistor and the other end of the first capacitor are grounded after being connected in parallel; an inverting input end of the operational amplifier U1 is respectively connected with one end of a fourth resistor, one end of a sixth resistor and one end of a third capacitor, the other end of the fourth resistor is connected with one end of a fifth resistor, and the other end of the fifth resistor is grounded; the other end of the sixth resistor and the other end of the third capacitor are connected in parallel and then connected with the output end of the operational amplifier U1, the output end of the operational amplifier U1 is also connected with one end of a seventh resistor, the other end of the seventh resistor is respectively connected with an ADC _ DC port of the controller and one end of a fourth capacitor, and the other end of the fourth capacitor is grounded; the positive power supply end of the operational amplifier U1 is respectively connected with one end of a first power supply and one end of a second capacitor, and the other end of the second capacitor is grounded; the negative power supply end of the operational amplifier U1 is grounded;

The end B is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with one end of a ninth resistor, the other end of the ninth resistor is connected with the non-inverting input end of the operational amplifier U2, the other end of the ninth resistor is also connected with one end of a tenth resistor and one end of a fifth capacitor respectively, and the other end of the tenth resistor and the other end of the fifth capacitor are connected with a second power supply after being connected in parallel; the inverting input end of the operational amplifier U2 is respectively connected with the output end of the U2 and one end of an eleventh resistor, and the other end of the eleventh resistor is connected with the non-inverting input end of the operational amplifier U3; the output end of the operational amplifier U2 is further connected with one end of a fifteenth resistor, the other end of the fifteenth resistor is respectively connected with an ADC _ AC _ U port of the controller and one end of a seventh capacitor, and the other end of the seventh capacitor is grounded; a positive power supply end of the operational amplifier U2 is respectively connected with a third power supply and one end of a sixth capacitor, and the other end of the sixth capacitor is grounded; the negative power supply end of the operational amplifier U2 is grounded;

The end C is connected with one end of a twelfth resistor, the other end of the twelfth resistor is connected with the inverting input end of an operational amplifier U3, the inverting input end of the operational amplifier U3 is further connected with one end of a thirteenth resistor and one end of an eighth capacitor respectively, the other end of the thirteenth resistor and the other end of the eighth capacitor are connected with the output end of an operational amplifier U3 after being connected in parallel, the output end of the operational amplifier U3 is further connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with a ZERO _ PLUS _ M port of the controller and one end of a ninth capacitor respectively, and the other end of the ninth capacitor is grounded; the positive power supply end of the operational amplifier U3 is connected with the fourth power supply, and the negative power supply end of the operational amplifier U3 is grounded.

Preferably, the pre-regulated rectifier circuit comprises an optocoupler and a thyristor:

the control output end of the controller is connected with one end of a sixteenth resistor, the other end of the sixteenth resistor is connected with the anode of the input end of the optical coupler, and the cathode of the input end of the optical coupler is grounded; a collector of an output end of the optocoupler is respectively connected with an emitter of the first triode, one end of the eighteenth resistor and one end of the nineteenth resistor, the emitter of the output end of the optocoupler is respectively connected with a base of the first triode and one end of the seventeenth resistor, and the other end of the seventeenth resistor and the other end of the eighteenth resistor are respectively connected with a collector of the second triode;

The other end of the nineteenth resistor is respectively connected with one end of a twentieth resistor, the cathode of the first diode and one end of a tenth capacitor, the other end of the twentieth resistor is connected with one end of a twenty-first resistor, the other end of the twenty-first resistor is respectively connected with one end of a twenty-second resistor, one end of a twenty-fourth resistor, one end of an eleventh capacitor and the base level of the second triode, the other end of the twenty-second resistor is connected with one end of a twenty-third resistor, and the other end of the twenty-third resistor is grounded; the other end of the tenth capacitor, the anode of the first diode, the other end of the twenty-fourth resistor and the other end of the eleventh capacitor are connected in parallel and then connected with the emitter of the second triode;

The emitter of the second triode is also respectively connected with one end of a twenty-fifth resistor, one end of a twenty-sixth resistor, one end of a twelfth capacitor, one end of a thirteenth capacitor and one end of a fourteenth capacitor, the other end of the twenty-fifth resistor and the other end of the twenty-sixth resistor are connected in parallel and then are respectively connected with a collector of the first triode, one end of a twenty-seventh resistor, one end of a twenty-eighth resistor and one end of a twenty-ninth resistor, the other end of the twenty-seventh resistor is respectively connected with the other end of the twelfth capacitor and the cathode of the third controlled silicon, the other end of the twenty-eighth resistor is respectively connected with the other end of the thirteenth capacitor and the cathode of the second controlled silicon, the other end of the twenty-ninth resistor is respectively connected with the other end of the fourteenth capacitor and the cathode of the first controlled silicon, and the anode of the first controlled silicon, the anode of the second controlled silicon and the anode of the third controlled silicon are respectively connected with the three-phase voltage output end of the; the control electrode of the first silicon controlled rectifier, the control electrode of the second silicon controlled rectifier and the control electrode of the third silicon controlled rectifier are connected in parallel and then connected with a fifth power supply; the anode of the second diode, the anode of the third diode and the anode of the fourth diode are respectively connected with the three-phase voltage output end of the three-phase alternating-current generator, and the cathode of the second diode, the cathode of the third diode and the cathode of the fourth diode are connected in parallel and then serve as output ends to be connected with the external module.

In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:

According to the invention, the three-phase half-controlled rectifier bridge is arranged, the controller judges and outputs the PWM waveform signal by collecting the voltage signal of the generator, and the pre-voltage-stabilizing rectifier circuit is controlled to adjust the output voltage of the generator so as to improve the stability of the output voltage, so that the problem of mutual electromagnetic interference between variable-frequency power generation and electric welding is solved, the reliability of the variable-frequency power generation and the electric welding is improved, the loss of elements is reduced, and the working efficiency is improved.

Description of the drawings:

Fig. 1 is a schematic structural diagram of a pre-voltage stabilizing system at a front stage of an intermediate-frequency permanent magnet power generation welding machine according to an exemplary embodiment of the invention.

Fig. 2 is a structural diagram of a three-phase voltage sampling circuit according to an exemplary embodiment of the present invention.

Fig. 3 is a block diagram of a controller according to an exemplary embodiment of the present invention.

fig. 4 is a structural diagram of a pre-stabilized rectifier circuit according to an exemplary embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.

Fig. 1 is an exemplary pre-voltage stabilizing system of a pre-voltage stabilizing rectification circuit 2 of an intermediate frequency permanent magnet generator welder, which includes a three-phase ac generator 1, a pre-voltage stabilizing rectification circuit 3, a three-phase voltage sampling circuit 3, a controller 4, an electric welding frequency conversion unit 5 and an electric power generation frequency conversion unit 6.

The voltage output end of the three-phase alternating-current generator 1 is connected with the voltage input end of the pre-voltage-stabilizing rectification circuit 2, the voltage output end of the pre-voltage-stabilizing rectification circuit 2 is respectively connected with the voltage input ends of the electric welding frequency conversion unit 5 and the power generation frequency conversion unit 6, the output end of the electric welding frequency conversion unit 5 is connected with an electric welding element, and the output end of the power generation frequency conversion unit 6 is connected with an electric load; and the three-phase voltage output end of the three-phase alternating current generator 1 is connected with the three-phase voltage input end of the three-phase voltage sampling circuit 3, the voltage output end of the three-phase voltage sampling circuit 3 is connected with the voltage input end of the controller 4, and the control output end of the controller 4 is connected with the control input end of the pre-stabilized voltage rectification circuit 2.

In this embodiment, the three-phase AC generator 1 sends out the intermediate frequency three-phase power (AC300-400V) with a frequency of 600HZ to the pre-stabilized rectifier circuit 2, and the three-phase voltage sampling circuit 3 samples the output voltage of the three-phase AC generator 1 and feeds back the sampled data to the controller 4, and the controller 4 outputs the PWM signal to control the conduction angle of the pre-stabilized rectifier circuit 2, so as to stabilize the output voltage, for example, DC380V, thereby avoiding the electromagnetic interference between the electric welding frequency conversion unit 5 and the power generation frequency conversion unit 6 caused by the fluctuation of the voltage.

fig. 2 is an exemplary three-phase voltage sampling circuit including operational amplifiers U1, U2, U3, and a three-phase alternator output terminal A, B, C, and fig. 3 is a controller block diagram:

The A end is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2, the other end of the second resistor R2 is connected with the non-inverting input end of U1, the other end of the second resistor R2 is connected with one end of a third resistor R3 and one end of a first capacitor C1, and the other end of the third resistor R3 and the other end of the first capacitor C1 are grounded after being connected in parallel; the reverse input end of the U1 is respectively connected with one end of a fourth resistor R4, one end of a sixth resistor R6 and one end of a third capacitor C3, the other end of the fourth resistor R4 is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is grounded; the other end of the sixth resistor R6 and the other end of the third capacitor C3 are connected in parallel and then connected with the output end of the U1, the output end of the U1 is also connected with one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected with an ADC _ DC port of the controller and one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded; the positive electrode of the voltage end of U1 is respectively connected with a first power supply Vcc and one end of a second capacitor C2, and the other end of the second capacitor C2 is grounded; the negative electrode of the voltage end of U1 is grounded;

the B end is connected with one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected with the non-inverting input end of U2, the other end of the ninth resistor R9 is also connected with one end of a tenth resistor R10 and one end of a fifth capacitor C5 respectively, and the other end of the tenth resistor R10 and the other end of the fifth capacitor C5 are connected with a second power supply VCC/2 after being connected in parallel; the inverting input end of the U2 is respectively connected with the output end of the U2 and one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected with the non-inverting input end of the U3; the output end of the U2 is further connected to one end of a fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to the ADC _ AC _ U port of the controller and one end of a seventh capacitor C7, respectively, and the other end of the seventh capacitor C7 is grounded; a positive power supply end of the U2 is respectively connected with a third power supply Vcc and one end of a sixth capacitor C6, and the other end of the sixth capacitor C6 is grounded; the negative power supply end of the U2 is grounded;

the end C is connected with one end of a twelfth resistor R12, the other end of the twelfth resistor R12 is connected with the inverting input end of U3, the inverting input end of U3 is also connected with one end of a thirteenth resistor R13 and one end of an eighth capacitor C8, the other end of the thirteenth resistor R13 and the other end of the eighth capacitor C8 are connected with the output end of U3 after being connected in parallel, the output end of U3 is also connected with one end of a fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected with the ZERO _ PLUS _ M port of the controller and one end of a ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded; the positive power supply end of the U3 is connected with a fourth power supply Vcc/2, and the negative power supply end of the U3 is grounded.

The three-phase voltage sampling circuit is used for collecting three-phase output voltage signals of the three-phase alternating-current generator, comparing the voltage signals with preset voltage of the controller, and if the voltage signals exceed the preset voltage, the controller sends PWM signals to the pre-voltage-stabilizing rectification circuit to adjust voltage waveforms.

Fig. 4 is an exemplary pre-regulated rectifier circuit, which includes an optocoupler and a thyristor:

A control output end (MX _ Con) of the controller is connected with one end of a sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected with an anode of an input end (namely a light-emitting diode) of the optical coupler, and a cathode of the input end of the optical coupler is grounded; a collector of an output end of the optocoupler is respectively connected with an emitter of the first triode Q1, one end of an eighteenth resistor R18 and one end of a nineteenth resistor R19, the emitter of the output end of the optocoupler is respectively connected with a base level of the first triode Q1 and one end of a seventeenth resistor R17, and the other end of the seventeenth resistor R17 and the other end of the eighteenth resistor R18 are respectively connected with a collector of the second triode Q2; the other end of the nineteenth resistor R19 is respectively connected with one end of a twentieth resistor R20, the cathode of the first diode D1 and one end of a tenth capacitor C10, the other end of the twentieth resistor R20 is connected with one end of a twenty-first resistor R21, the other end of the twenty-first resistor R21 is respectively connected with one end of a twenty-second resistor R22, one end of a twenty-fourth resistor R24, one end of an eleventh capacitor C11 and the base level of the second triode Q2, the other end of the twenty-second resistor R22 is connected with one end of a twenty-third resistor R23, and the other end of the twenty-third resistor R23 is grounded; the other end of the tenth capacitor C10, the anode of the first diode D1, the other end of the twenty-fourth resistor R24 and the other end of the eleventh capacitor C11 are connected in parallel and then connected with the emitter of the second triode Q2;

The emitter of the second triode Q2 is further connected with one end of a twenty-fifth resistor R25, one end of a twenty-sixth resistor R26, one end of a twelfth capacitor C12, one end of a thirteenth capacitor C13 and one end of a fourteenth capacitor C14 respectively, the other end of a twenty-fifth resistor R25 and the other end of a twenty-sixth resistor R26 are connected in parallel and then connected with the collector of the first triode Q1, one end of a twenty-seventh resistor R27, one end of a twenty-eighth resistor R28 and one end of a twenty-ninth resistor R29 respectively, the other end of a twenty-seventh resistor R27 is connected with the other end of a twelfth capacitor C4624 and the cathode of the thyristor S3 respectively, the other end of a twenty-eighth resistor R28 is connected with the other end of a thirteenth capacitor C9 and the cathode of the thyristor S2 respectively, the other end of a twenty-ninth resistor R29 is connected with the other end of a fourteenth capacitor C14 and the cathode of the thyristor S1 respectively, the thyristor S1, the other end of the thyristor S6867 and the DC V are connected in parallel and the control power supply 36, anodes of the controllable silicon S1, S2 and S3 are respectively connected with the port of the output end A, B, C of the three-phase alternating-current generator; the anode of the second diode D2, the anode of the third diode D3 and the anode of the fourth diode D4 are respectively connected with the port of the output end A, B, C of the three-phase alternating-current generator, and the cathode of the second diode D2, the cathode of the third diode D3 and the cathode of the fourth diode D4 are connected in parallel and then respectively connected with the input ends of the electric welding frequency conversion unit 5 and the power generation frequency conversion unit 6.

in this embodiment, the thyristors S1, S2, and S3, the second diode D2, the third diode D3, and the fourth diode D4 form a three-phase half-controlled rectifier circuit.

in this embodiment, controller 3 gathers three-phase alternator 1's output voltage signal through three-phase sampling circuit 3, when the voltage that detects surpassed and predetermine the voltage in the controller, controller 3 will export the conduction angle of silicon controlled rectifier in the PWM wave form adjustment voltage stabilizing rectifier circuit 2 in advance in order to adjust three-phase alternator 1's output voltage, thereby guarantee output voltage's stability, avoid causing the electromagnetic interference between electric welding frequency conversion unit 5 and the electricity generation frequency conversion unit 6 because of the fluctuation of voltage, the damage rate of component has been reduced, and then improve work efficiency.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.