CN111250829A - Digital control circuit of underwater constant-power external characteristic welding power supply - Google Patents
Digital control circuit of underwater constant-power external characteristic welding power supply Download PDFInfo
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- CN111250829A CN111250829A CN202010207476.8A CN202010207476A CN111250829A CN 111250829 A CN111250829 A CN 111250829A CN 202010207476 A CN202010207476 A CN 202010207476A CN 111250829 A CN111250829 A CN 111250829A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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Abstract
The invention provides a digital control circuit of an underwater constant-power external characteristic welding power supply, which comprises a full-bridge rectification filter circuit, an inverter circuit, an optical coupling isolation circuit, a single chip microcomputer circuit and a power supply circuit, wherein the full-bridge rectification filter circuit is connected with the inverter circuit; the full-bridge rectification filter circuit is electrically connected with 220V alternating current on the power grid side; the inverter circuit comprises an inverter module, a voltage transformation module and a filtering smoothing module; the filtering smoothing module is connected with an external arc load; the optical coupling isolation circuit is respectively connected with the filtering smoothing module and the single chip microcomputer circuit; the power circuit is connected with a 5V direct-current power supply; and the singlechip circuit is respectively connected with the inverter module, the optical coupling isolation circuit and the power circuit. The circuit can realize the constant-power external characteristic output of the welding power supply, and when manual shielded metal arc welding is carried out in an underwater environment, arc striking is easier, the welding process is more stable, welding seams are more uniform, and the mechanical property is improved.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a digital control circuit of a constant-power external characteristic welding power supply.
Background
Compared with land welding, the underwater wet welding is still a land welding method in nature, but the underwater welding environment is more severe, and certain technological improvement is generally needed to welding equipment, such as a welding power supply, so as to overcome the influence of the underwater environment on welding.
In the wet welding of underwater manual shielded metal arc welding, as in the manual welding in the air, the length of an arc is changed due to unevenness of a weldment and shaking of hands during the welding process, and the change of the length of the arc causes a change in welding voltage, thereby affecting the welding quality. In addition, underwater welding rod wet welding has unique problems compared with welding in air as follows: 1) although a large amount of gas-forming agent and arc stabilizer are added into the underwater welding rod, the arc striking process is still difficult in water; 2) compared with air welding, underwater wet welding needs to bear larger external pressure, so that larger voltage and current are needed between electrodes to ensure stable combustion of electric arcs; 3) the arc burns in the dynamic bubble, the bubble grows-bursts-regrowth, which has an effect on the arc stability. In a word, in the underwater wet welding process, the welding voltage and the welding current are influenced by a plurality of factors, so that the constant-power external characteristic welding power supply is provided for solving the problems, the stable operation of the welding process is ensured, and a good welding effect is achieved.
For the existing welding power supply, a feedback system of the existing welding power supply is mostly controlled by adopting an analog device, and the existing welding power supply has the advantages of low response speed and low precision. Therefore, a feedback control system using the single chip microcomputer as a control core is provided, and response speed and accuracy can be improved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a digital control circuit of an underwater constant-power external characteristic welding power supply, which has the advantages of easy arc striking, stable welding process, higher welding response speed and higher precision.
The purpose of the invention is realized by the following technical scheme:
a digital control circuit of an underwater constant-power external characteristic welding power supply comprises: a digital control circuit of an underwater constant-power external characteristic welding power supply is characterized in that: the circuit comprises a full-bridge rectification filter circuit, an inverter circuit, an optical coupling isolation circuit, a single chip circuit and a power circuit; the full-bridge rectification filter circuit is electrically connected with 220V alternating current on the power grid side; the inverter circuit comprises an inverter module, a voltage transformation module and a filtering smoothing module; the filtering smoothing module is connected with an external arc load; the optical coupling isolation circuit is respectively connected with the filtering smoothing module and the single chip microcomputer circuit; the power circuit is connected with a 5V direct-current power supply; and the singlechip circuit is respectively connected with the inverter module, the optical coupling isolation circuit and the power circuit.
Further, the inverter module comprises a switching tube M1, a switching tube M2, a switching tube M3 and a switching tube M4; the transformation module comprises a transformer T1; the filtering smoothing module comprises a rectifying diode VD1, a rectifying diode VD2, an inductor L1 and a capacitor C6;
after the switching tube M1 and the switching tube M3 are connected in series, the switching tube M1 and the switching tube M3 are connected in parallel with a circuit formed by connecting the switching tube M2 and the switching tube M4 in series to form a full-bridge inverter circuit, and then the full-bridge inverter circuit is connected with the primary side of a transformer T1; the junction of the switching tube M1 and the switching tube M3 is connected with a primary first input end of a transformer T1, and the junction of the switching tube M2 and the switching tube M4 is connected with a primary second input end of a transformer T1;
the first output end of the secondary side of the transformer T1 is connected with the third output end of the secondary side of the transformer T1 through a rectifying diode VD1 and a rectifying diode VD2 which are connected in sequence; the junction of the rectifying diode VD1 and the rectifying diode VD2 is connected with one end of the inductor L1; the other end of the inductor L1 and a second output end of the secondary side of the transformer T1 are respectively used as output ends of the inverter circuit and connected with a load; the capacitor C6 is connected in parallel across the load.
Furthermore, a diode D5, a diode D6, a diode D7 and a diode D8 are respectively connected in parallel to two ends of the switching tube M1, the switching tube M2, the switching tube M3 and the switching tube M4.
Furthermore, two ends of the switch tube M1, the switch tube M2, the switch tube M3 and the switch tube M4 are respectively connected in parallel with an RC absorption circuit.
Further, the RC absorption circuit comprises a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the capacitor C2 and the resistor R2 are connected in series and then connected to the switching tube M1 in parallel;
the capacitor C3 and the resistor R3 are connected in series and then connected to the switching tube M2 in parallel;
the capacitor C4 and the resistor R4 are connected in series and then connected to the switching tube M3 in parallel;
the capacitor C5 and the resistor R5 are connected in series and then connected to the switching tube M4 in parallel.
Further, the full-bridge rectification filter circuit comprises a rectifying diode D1, a rectifying diode D2, a rectifying diode D3, a rectifying diode D4, a resistor R1 and a capacitor C1; the rectifier diode D1 is connected with the rectifier diode D2 in series and then is connected with a circuit formed by the rectifier diode D3 and the rectifier diode D4 in series in parallel to form a full-bridge rectifier circuit; the resistor R1 is connected in parallel with the capacitor C1, and the two ends of the resistor R1 are respectively connected to the connection position of the rectifier diode D2 and the rectifier diode D3 and the connection position of the rectifier diode D1 and the rectifier diode D4.
Further, the optical coupling isolation circuit comprises a resistor R201, a resistor R202, a capacitor C201, a capacitor C202, an amplifier A1, an amplifier A2 and a linear optical coupling chip;
the positive pole of the input voltage is connected with a pin 3 of the linear optocoupler chip through a resistor R201, and the negative pole of the input voltage is connected with a pin 4 of the linear optocoupler chip; the positive pole of the amplifier A1 is connected with the connection part of the resistor R201 and the pin 3 of the linear optical coupling chip, the negative pole of the amplifier A1 is connected with the pin 4 of the linear optical coupling chip, and the output end of the amplifier A1 is connected with the pin 1 of the linear optical coupling chip through the resistor R203; the capacitor C201 is connected in parallel with the negative pole and the output end of the amplifier A1; the resistor R202 is connected with the capacitor C202 in parallel and then connected with the pin 6 of the linear optocoupler chip and the output end of the amplifier A2; and a pin 6 of the linear optical coupler chip is connected with a pin 5 of the linear optical coupler chip and the negative electrode of the amplifier A2 is connected with the positive electrode of the amplifier A2.
Further, the power supply circuit comprises a capacitor C7, a capacitor C8, a capacitor C9, a resistor R6, a resistor R7 and a voltage conversion chip; and a 3.3V pin of the single chip microcomputer circuit is connected with a GND pin and the output end of the voltage conversion chip.
Furthermore, a pin of the singlechip ADC1 of the singlechip circuit is connected with a pin of the singlechip ADC2 and the output end of the optical coupling isolation circuit; a single chip microcomputer PWM1 pin of the single chip microcomputer circuit is connected with a switching tube M1 and a switching tube M4 of the inversion module; and a single chip microcomputer PWM2 pin of the single chip microcomputer circuit is connected with a switching tube M2 and a switching tube M3 of the inverter module.
According to the invention, the voltage and the current of the power load end are introduced into the optical coupling isolation circuit and then enter an ADC pin of the singlechip for collection, and after the collected voltage and current values are compared with preset values, the on-off time of a switching tube in the inverter circuit is changed, so that the duty ratio regulation is realized, the constant power external characteristic curve is obtained, and the closed loop feedback control is completed.
Compared with the prior art, one or more embodiments of the invention can have the following advantages and beneficial effects:
(1) the circuit has the advantages that the linear conversion precision of the linear optocoupler is high, the error is small when high-voltage and low-voltage conversion is carried out, and the voltage and current acquisition is more accurate. The singlechip is used for collecting voltage and current, and system errors generated in the collecting process can be digitally corrected.
(2) The circuit of the invention uses the singlechip to replace the traditional analog device as the feedback control core, and the singlechip has high processing speed, so that the response speed of the closed-loop feedback system is higher and the response precision is higher.
(3) The invention adopts the digital control technology based on the singlechip, so that the circuit design is simpler, and the duty ratio is adjusted and controlled simply by using the timer function of the singlechip to generate the PWM waveform.
Drawings
FIG. 1 is a block circuit diagram of a digital control circuit for an underwater constant power external characteristic welding power supply of the present invention;
FIG. 2 is a circuit diagram of the overall topology of the digital control circuit of the underwater constant power external characteristic welding power supply of the present invention;
FIG. 3 is a circuit diagram of an inverter circuit in the digital control circuit of an underwater constant power external characteristic welding power supply of the present invention;
FIG. 4 is a circuit diagram of an optical coupling isolation circuit in the digital control circuit of the underwater constant power external characteristic welding power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1 and 2, the digital control circuit of the underwater constant-power external characteristic welding power supply comprises a full-bridge rectification filter circuit 10, an inverter circuit 20, an optical coupling isolation circuit 30, a singlechip circuit 40 and a power circuit 50; the full-bridge rectification filter circuit 10 is electrically connected with 220V alternating current on the power grid side; the inverter circuit 20 comprises an inverter module 21, a voltage transformation module 22 and a filtering smoothing module 23; wherein, the filtering and smoothing module 23 is connected with an external arc load; the optical coupling isolation circuit 30 is respectively connected with the filtering smoothing module 23 and the singlechip circuit 40; the power circuit 50 is connected to a 5V dc power supply. The single chip microcomputer circuit 40 is respectively connected with the inverter module 21, the optical coupling isolation circuit 30 and the power circuit 50.
The principle of the control circuit of the invention is as follows: the voltage and the current of the power load end are led into the optical coupling isolation circuit 30 and then enter an ADC pin of the single chip microcomputer circuit 40 for collection, after the collected voltage and current values are compared with preset values, the on-off time of a switch tube in the inverter circuit 20 is changed, duty ratio regulation is achieved, a constant power external characteristic curve is obtained, and closed loop feedback control is completed.
Compared with the prior art, the invention has the following advantages: 1) the circuit has the advantages that the linear conversion precision of the linear optocoupler is high, the error is small when high-voltage and low-voltage conversion is carried out, and the voltage and current acquisition is more accurate. The singlechip is used for collecting voltage and current, and system errors generated in the collecting process can also be digitally corrected; 2) in the circuit, the singlechip is used for replacing the traditional analog device as a feedback control core, and the singlechip has high processing speed, so that the response speed and the response precision of a closed-loop feedback system are higher; 3) the invention adopts the digital control technology based on the singlechip, so that the circuit design is simpler, and the duty ratio is adjusted and controlled simply by using the timer function of the singlechip to generate the PWM waveform.
As shown in fig. 3, the inverter circuit 20 includes an inverter module 21, a transformer module 22, and a filter smoothing module 23; wherein the smoothing module 23 is connected to an external arc load.
The ratio of the on time and the off time of the 4 switching tubes in the inverter circuit 20 determines the magnitude of the output voltage and the current, i.e., the change of the duty ratio determines the external characteristics of the power output. Therefore, the inverter circuit makes it easy to control the external characteristics of the power supply, and the external characteristics can be controlled by controlling the duty ratios of 4 switching tubes of the inverter circuit 20 by the adjustable PWM waveform output by the single chip microcomputer.
The inverter module 21 includes a switch tube M1, a switch tube M2, a switch tube M3, and a switch tube M4. The switching tube M1 is connected with the switching tube M3 and then is connected with a circuit formed by connecting the switching tube M2 with the switching tube M4 in parallel to form an inverter circuit; each switch tube is connected with an RC absorption circuit in parallel, and the RC absorption circuit comprises: the circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5. The resistor R2 is connected with the capacitor C2 and then is connected with the switching tube M1 in parallel; the resistor R3 is connected with the capacitor C3 and then is connected with the switching tube M2 in parallel; the resistor R4 is connected with the capacitor C4 and then is connected with the switching tube M3 in parallel; the resistor R5 is connected with the capacitor C5 and then connected with the switch tube M4 in parallel. Each switch tube is also connected with a diode in parallel, and the method specifically comprises the following steps: the switch tube M1 is also connected in parallel with a diode D5, the switch tube M2 is also connected in parallel with a diode D6, the switch tube M3 is also connected in parallel with a diode D7, and the switch tube M4 is also connected in parallel with a diode D8.
The transformer module 22 includes a transformer T1. The primary input end of the transformer T1 is respectively connected with the connection position of the switching tube M1 and the switching tube M3 and the connection position of the switching tube M2 and the switching tube M4.
The filter smoothing module 23 comprises a rectifying diode VD1, a rectifying diode VD2, an inductor L1 and a capacitor C6. The rectifying diode VD1 is connected with the rectifying diode VD2, and then is respectively connected with the first output end of the secondary side of the transformer T1 and the third output end of the secondary side of the transformer T1; the inductor L1 is connected with the capacitor C6, and then is respectively connected to the connection position of the rectifier diode VD1 and the rectifier diode VD2 and the second output end of the secondary side of the transformer T1; the capacitor C6 is connected to the load as an output terminal of the inverter circuit 20.
As shown in fig. 2, the full-bridge filter rectifier circuit 10 includes a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, and a capacitor C1. The rectifier diode D1 is connected with the rectifier diode D2 in series and then is connected with a circuit formed by the rectifier diode D3 and the rectifier diode D4 in series in parallel to form a full-bridge rectifier circuit; the resistor R1 is connected with the capacitor C1 in series, and two ends of the resistor R1 are respectively connected to the connection position of the rectifier diode D2 and the rectifier diode D3 and the connection position of the rectifier diode D1 and the rectifier diode D4; two ends of the capacitor C1 are connected to the input end of the inverter circuit 20 as the output end of the filter rectification circuit 10.
The full-bridge rectification filter circuit 10 has a simple circuit structure, and only needs 4 diodes, 1 resistor and 1 capacitor to convert the alternating current at the power grid side into the direct current with smooth ripple. The product of the resistance value and the capacitance value in the circuit determines the charging and discharging time of the capacitor, so the ripple smoothing degree of the output direct current of the full-bridge rectifying and filtering circuit 10 is determined by the product of the resistance value and the capacitance value, which makes the control of the ripple smoothing degree of the output direct current of the full-bridge rectifying and filtering circuit 10 simple.
As shown in fig. 2, the single chip microcomputer needs 3 modules, namely a power supply module, an ADC module and a PWM module. The pin of the singlechip ADC1 is connected with the pin of the singlechip ADC2 and the output end of the optical coupling isolation circuit 30; the monolithic PWM1 pin is connected with a switching tube M1 and a switching tube M4 of the inverter module 20; and a pin of the single chip microcomputer PWM2 is connected with a switching tube M2 and a switching tube M3 of the inverter module 21.
The singlechip integrates an AD (analog-to-digital) conversion circuit, a timer circuit, a USART (Universal Serial bus transfer) serial port communication circuit and the like. The voltage value can be directly collected through the AD conversion interface, the timer interface can output PWM waveforms, and USART serial port communication can send the collected voltage value to a computer end for display, so that the single chip microcomputer can simplify the circuit of the invention. In addition, the program of the single chip microcomputer is easy to write, the pin function can be configured by STM32CubeMX software developed by ST company, the configuration program is directly output, and the program writing work is simplified.
As shown in fig. 2, the power supply circuit 50 includes a capacitor C7, a capacitor C8, a capacitor C9, a resistor R6, a resistor R7, and a voltage converter. The voltage converter model can convert an input voltage of 5V into an output voltage of 3.3V.
As shown in fig. 4, the optical coupler isolation circuit 30 includes a resistor R201, a resistor R202, a capacitor C201, a capacitor C202, an amplifier a1, an amplifier a2, and a linear optical coupler chip; the positive pole of the input voltage is connected with a pin 3 of the linear optocoupler chip through a resistor R201, and the negative pole of the input voltage is connected with a pin 4 of the linear optocoupler chip; the positive pole of the amplifier A1 is connected with the connection part of the resistor R201 and the pin 3 of the linear optical coupling chip, the negative pole of the amplifier A1 is connected with the pin 4 of the linear optical coupling chip, and the output end of the amplifier A1 is connected with the pin 1 of the linear optical coupling chip through the resistor R203; the capacitor C201 is connected in parallel with the negative pole and the output end of the amplifier A1; the resistor R202 is connected with the capacitor C202 in parallel and then connected with the pin 6 of the linear optocoupler chip and the output end of the amplifier A2; and a pin 6 of the linear optical coupler chip is connected with a pin 5 of the linear optical coupler chip and the negative electrode of the amplifier A2 is connected with the positive electrode of the amplifier A2.
The optical coupling isolation circuit 30 is used for linearly reducing the high voltage at the power load end and then connecting an AD pin of the single chip microcomputer to acquire voltage. In the process, the optical coupling isolation circuit can well separate strong electricity at the power load end from weak electricity of the single chip microcomputer, and interference of a strong electricity system to the weak electricity system is avoided.
The ratio of the input voltage to the output voltage of the linear optocoupler chip is equal to the ratio of the resistors R202 and R201. The linear conversion precision of the optical coupler is high and is +/-5%. The conversion precision error of the optical coupler can be measured in the circuit, and the error is a system error and can be corrected.
As shown in FIG. 2, the 220V AC at the power grid side is connected to the input end of the full-bridge filter rectification circuit 10, and the AC is converted into DC with smooth ripple through filter rectification. The output end of the filter rectification circuit 10 is connected to the input end of the inverter circuit 20, and the output end of the inverter circuit 20 is connected to a load. The input end of the optical coupling isolation circuit 30 is connected to the two ends of the load, the voltage at the two ends of the load is reduced in equal proportion through the linear optical coupler, and the voltage at the output end of the optical coupler is connected with an ADC pin of the single chip microcomputer to collect voltage and current signals. The single chip microcomputer compares the acquired voltage with a current value and a preset value, and changes the on-off time of a switch tube in the inverter circuit 20 by outputting a PWM voltage to realize duty ratio regulation, thereby realizing the control of the output electric signal of the inverter circuit 20.
Compared with the prior art, the topological circuit has the greatest advantages that the singlechip is used as a feedback control system, the traditional analog feedback control element is replaced, digital control is realized, the feedback control circuit is simpler, the response speed of feedback is improved, and the problem of accuracy reduction caused by the fact that the feedback accuracy is aged along with the analog element is solved.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A digital control circuit of an underwater constant-power external characteristic welding power supply is characterized in that: the circuit comprises a full-bridge rectification filter circuit, an inverter circuit, an optical coupling isolation circuit, a single chip circuit and a power circuit;
the full-bridge rectification filter circuit is electrically connected with 220V alternating current on the power grid side;
the inverter circuit comprises an inverter module, a voltage transformation module and a filtering smoothing module; the filtering smoothing module is connected with an external arc load;
the optical coupling isolation circuit is respectively connected with the filtering smoothing module and the single chip microcomputer circuit;
the power circuit is connected with a 5V direct-current power supply;
and the singlechip circuit is respectively connected with the inverter module, the optical coupling isolation circuit and the power circuit.
2. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 1, wherein: the inverter module comprises a switching tube M1, a switching tube M2, a switching tube M3 and a switching tube M4; the transformation module comprises a transformer T1; the filtering smoothing module comprises a rectifying diode VD1, a rectifying diode VD2, an inductor L1 and a capacitor C6;
after the switching tube M1 and the switching tube M3 are connected in series, the switching tube M1 and the switching tube M3 are connected in parallel with a circuit formed by connecting the switching tube M2 and the switching tube M4 in series to form a full-bridge inverter circuit, and then the full-bridge inverter circuit is connected with the primary side of a transformer T1; the junction of the switching tube M1 and the switching tube M3 is connected with a primary first input end of a transformer T1, and the junction of the switching tube M2 and the switching tube M4 is connected with a primary second input end of a transformer T1;
the first output end of the secondary side of the transformer T1 is connected with the third output end of the secondary side of the transformer T1 through a rectifying diode VD1 and a rectifying diode VD2 which are connected in sequence; the junction of the rectifying diode VD1 and the rectifying diode VD2 is connected with one end of the inductor L1; the other end of the inductor L1 and a second output end of the secondary side of the transformer T1 are respectively used as output ends of the inverter circuit and connected with a load; the capacitor C6 is connected in parallel across the load.
3. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 2, wherein: and the two ends of the switching tube M1, the switching tube M2, the switching tube M3 and the switching tube M4 are respectively connected with a diode D5, a diode D6, a diode D7 and a diode D8 in parallel.
4. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 2, wherein: and two ends of the switch tube M1, the switch tube M2, the switch tube M3 and the switch tube M4 are respectively connected with an RC absorption circuit in parallel.
5. The digital control circuit of the underwater constant power external characteristic welding power supply as claimed in claim 4, wherein: the RC absorption circuit comprises a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the capacitor C2 and the resistor R2 are connected in series and then connected to the switching tube M1 in parallel;
the capacitor C3 and the resistor R3 are connected in series and then connected to the switching tube M2 in parallel;
the capacitor C4 and the resistor R4 are connected in series and then connected to the switching tube M3 in parallel;
the capacitor C5 and the resistor R5 are connected in series and then connected to the switching tube M4 in parallel.
6. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 1, wherein: the full-bridge rectification filter circuit comprises a rectifier diode D1, a rectifier diode D2, a rectifier diode D3, a rectifier diode D4, a resistor R1 and a capacitor C1; the rectifier diode D1 is connected with the rectifier diode D2 in series and then is connected with a circuit formed by the rectifier diode D3 and the rectifier diode D4 in series in parallel to form a full-bridge rectifier circuit; the resistor R1 is connected in parallel with the capacitor C1, and the two ends of the resistor R1 are respectively connected to the connection position of the rectifier diode D2 and the rectifier diode D3 and the connection position of the rectifier diode D1 and the rectifier diode D4.
7. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 1, wherein: the optical coupling isolation circuit comprises a resistor R201, a resistor R202, a capacitor C201, a capacitor C202, an amplifier A1, an amplifier A2 and a linear optical coupling chip;
the positive pole of the input voltage is connected with a pin 3 of the linear optocoupler chip through a resistor R201, and the negative pole of the input voltage is connected with a pin 4 of the linear optocoupler chip; the positive pole of the amplifier A1 is connected with the connection part of the resistor R201 and the pin 3 of the linear optical coupling chip, the negative pole of the amplifier A1 is connected with the pin 4 of the linear optical coupling chip, and the output end of the amplifier A1 is connected with the pin 1 of the linear optical coupling chip through the resistor R203; the capacitor C201 is connected in parallel with the negative pole and the output end of the amplifier A1; the resistor R202 is connected with the capacitor C202 in parallel and then connected with the pin 6 of the linear optocoupler chip and the output end of the amplifier A2; and a pin 6 of the linear optical coupler chip is connected with a pin 5 of the linear optical coupler chip and the negative electrode of the amplifier A2 is connected with the positive electrode of the amplifier A2.
8. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 1, wherein: the power supply circuit comprises a capacitor C7, a capacitor C8, a capacitor C9, a resistor R6, a resistor R7 and a voltage conversion chip; and a 3.3V pin of the single chip microcomputer circuit is connected with a GND pin and the output end of the voltage conversion chip.
9. The digital control circuit of an underwater constant power external characteristic welding power supply as claimed in claim 1, wherein: a singlechip ADC1 pin of the singlechip circuit is connected with a singlechip ADC2 pin and the output end of the optical coupling isolation circuit; a single chip microcomputer PWM1 pin of the single chip microcomputer circuit is connected with a switching tube M1 and a switching tube M4 of the inversion module; and a single chip microcomputer PWM2 pin of the single chip microcomputer circuit is connected with a switching tube M2 and a switching tube M3 of the inverter module.
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| CN210080923U (en) * | 2019-05-29 | 2020-02-18 | 华南理工大学 | Fast-frequency pulse TIG welding system |
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| CN107045779A (en) * | 2017-02-23 | 2017-08-15 | 上海循道新能源科技有限公司 | Control of Electric Vehicles pilot detection circuit with isolation features |
| CN207508489U (en) * | 2017-11-30 | 2018-06-19 | 华南理工大学 | Digitlization variable polarity welding power supply based on SiC IGBT |
| CN210080923U (en) * | 2019-05-29 | 2020-02-18 | 华南理工大学 | Fast-frequency pulse TIG welding system |
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Application publication date: 20200609 |