DSC-based all-digital SiC inversion type multi-function argon arc welding power supply

Patent metadata

Field	Value
Publication number	US-11298771-B2
Application number	US-201816049956-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 15, 2016
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The invention provides a DSC-based full-digital SiC inversion type multi-function argon arc welding power supply, which includes a main circuit and a DSC control circuit; the main circuit includes a common mode noise suppression module, a power frequency rectification and filter module, a SiC inversion and commutation module, power transformer, a SiC rectification and smoothing module and a non-contact arc ignition module connected in sequence and are respectively connected to external arc load; the DSC control circuit includes a DSC minimum system, a human-machine interaction module, a fault diagnosis and protection module, a SiC high-frequency drive module connected to SiC inversion and commutation module, and an electrical load signal detection module connected to the arc load. The argon arc welding power supply has a simple structure, high control accuracy, fast response, small size, high efficiency, low energy consumption and excellent process adaptability, which can improve the quality of welding process.

First claim

What is claimed is:

1. A DSC-based all-digital SiC inversion type multi-function argon arc welding power supply, comprising a main circuit and a DSC control circuit;
the main circuit comprising a common mode noise suppression module, a power frequency rectification and filtering module, a SiC inversion and commutation module, a power transformer, a SiC rectification and smoothing module and a non-contact arc ignition module that are connected in sequence, wherein the common mode noise suppression module is connected to an external AC input power, while the SiC rectification and smoothing module and the non-contact arc ignition module are connected to external arc load respectively;
the DSC control circuit comprising a DSC minimum system, and a human-machine interaction module, a SiC high-frequency drive module and an electrical load signal detection module which are respectively connected to the DSC minimum system; wherein the DSC minimum system comprises a DSC microprocessor, a 3.3V power supply module, an external clock oscillation module, a reset module, a JTAG debug interface and auxiliary peripheral circuits, the SiC high-frequency drive module is connected to the SiC inversion and commutation module, the electrical load signal detection module is connected to the arc load, and the non-contact arc ignition module is connected to the DSC minimum system.

2. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 1 , wherein the SiC inversion and commutation module comprises a capacitor (C 4 ), a capacitor (C 5 ), a capacitor (C 6 ), a capacitor (C 7 ), a SiC power switch tube (Q 1 ), a SiC power switch tube (Q 2 ), a resistor (R 6 ), a resistor (R 7 ), a diode (D 4 ) and a diode (D 5 );
the capacitor (C 4 ) and the capacitor (C 5 ) are connected in series to form a first circuit, and the SiC power switch tube (Q 1 ) and the SiC power switch tube (Q 2 ) are connected in series to form a second circuit, the first circuit and the second circuit are connected in parallel to the power frequency rectification and filter module;
the capacitor (C 6 ) and the resistor (R 6 ) are connected in series to form a third circuit, the third circuit is connected in parallel to the SiC power switch tube (Q 1 ) which is further connected in parallel with the diode (D 4 ); the capacitor (C 7 ) and the resistor (R 7 ) are connected in series to form a fourth circuit, the fourth circuit is connected in parallel to the SiC power switch tube (Q 2 ) which is further connected in parallel with the diode (D 5 ); a connection point of the capacitor (C 4 ) and the capacitor (C 5 ) is further connected to a primary first input of the transformer; a connection point of the SiC power switch tube (Q 1 ) and the SiC power switch tube (Q 2 ) is connected to a primary second input of the power transformer; the SiC power switch tube (Q 1 ) and the SiC power switch tube (Q 2 ) are respectively connected to the SiC high-frequency drive module.

3. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 1 , wherein the SiC rectification and smoothing module comprises a diode (D 6 A), a diode (D 6 B), a resistor (R 5 ), a resistor (R 9 ), a resistor (R 11 ), a capacitor (C 9 ), a capacitor (C 10 ), a capacitor (C 11 ), a capacitor (C 12 ), a capacitor (C 17 ), a varistor (YM 1 ), a varistor (YM 2 ) and an inductor (L 2 );
a secondary first output of the power transformer is connected to a secondary second output of the power transformer through the diode (D 6 A), the resistor (R 9 ), and the inductor (L 2 ) in sequence; the resistor (R 5 ) and the capacitor (C 9 ) are connected in series to form a fifth circuit, the fifth circuit is arc connected to the diode (D 6 A) in parallel; the diode (D 6 A) is connected to the varistor (YM 1 ) in parallel; the capacitor (C 11 ) and the capacitor (C 12 ) are connected in series to form a sixth circuit, the sixth circuit is connected to the resistor (R 9 ) in parallel; the resistor (R 9 ) is connected in parallel with the capacitor (C 10 ); a connection point of the capacitor (C 11 ) and the capacitor (C 12 ) is grounded;
a connection point of diode (D 6 A) and resistor (R 9 ) is further connected to a secondary third output of the power transformer through diode (D 6 B); capacitor (C 17 ) is connected in series with resistor (R 11 ) to form a seventh circuit, the seventh circuit is connected in parallel with diode (D 6 B); diode (D 6 B) is connected in parallel with varistor (YM 2 ); both ends of resistor (R 9 ) are connected to the arc load separately.

4. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 1 , wherein the SiC high-frequency drive module comprises a power supply circuit, a push-pull output circuit, a magnetic isolation circuit and a signal shaping circuit.

5. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 4 , wherein the power supply circuit consists of an LM2596s voltage switching regulator and a peripheral circuit of the LM2596s voltage switching regulator.

6. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 4 , wherein the push-pull output circuit comprises an IXDN609PI switching amplifier (U 1 ) and a peripheral circuit of the IXDN609PI switching amplifier (U 1 ), and an IXDN609PI switching amplifier (U 2 ) and a peripheral circuit of the IXDN609PI switching amplifier (U 2 ); input ends of the switching amplifier (U 1 ) and the switching amplifier (U 2 ) are separately connected to SiC inversion and commutation module, while their output ends are respectively connected to the magnetic isolation circuit.

7. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 4 , wherein the magnetic isolation circuit comprises a pulse transformer (T 101 ); the signal shaping circuit comprises a signal shaping unit 1 and a signal shaping unit 2 with identical structure; the signal shaping unit 1 and the signal shaping unit 2 are respectively connected to two secondary coils of pulse transformer (T 101 ) in opposite direction.

8. The DSC-based all-digital SiC inversion type multi-function argon arc welding power supply as claimed in claim 7 , wherein the signal shaping unit includes a diode (D 113 ), a diode (D 117 ), a Zener diode (D 122 ), a Zener diode (D 125 ), a Zener diode (D 126 ), a dual diode group (DQ 101 ), a resistor (R 105 ), a resistor (R 109 ), a resistor (R 117 ), a resistor (R 121 ) and a switch tube (Q 101 );
one end of a secondary first coil of the pulse transformer (T 101 ) is in turn connected to the diode (D 113 ) through the diode (D 117 ), the Zener diode (D 122 ), the Zener diode (D 126 ), and the Zener diode (D 125 ); the diode (D 113 ) is connected to the other end of the secondary first coil of the magnetic isolation circuit; one end of a secondary first coil of the magnetic isolation circuit is connected to the diode (D 113 ) through the resistor ( 109 ); the Zener diode (D 122 ) is connected to the diode (D 113 ) through resistor (R 113 ) and the dual diode group (DQ 101 ); the Zener diode (D 122 ) is connected to the diode (D 113 ) through the resistor (R 121 ) and the resistor (R 117 ); a connection point of the diode (D 117 ) and the Zener diode (D 122 ) is connected to the diode (D 113 ) through the switch tube (Q 101 ); a connection point of the resistor (R 109 ) and the diode (D 117 ) is connected to the switch tube (Q 101 ); the resistor ( 105 ) is connected in parallel with the diode (D 113 ); and the capacitor (C 115 ) is connected in parallel with the Zener diode (D 122 ).

Assignees

• Univ South China Tech

Inventors

• Wang Zhenmin
• Fan Wenyan
• Jiang Chun
• Wang Qian

Classifications

• B23K9/095

  Monitoring or automatic control of welding parameters · CPC title

• B23K9/073

  Stabilising the arc · CPC title

• H02M3/33515 Primary

  with digital control · CPC title

• B23K9/067 Primary

  Starting the arc · CPC title

• B23K9/091

  characterised by the circuits · CPC title