CN213729873U

CN213729873U - Inversion type direct current welding power supply of nail rolling machine

Info

Publication number: CN213729873U
Application number: CN202022606307.XU
Authority: CN
Inventors: 郭海滨; 郭海坤
Original assignee: Qingdao Oumaige Electronic Technology Co ltd
Current assignee: Qingdao Oumaige Electronic Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-20
Anticipated expiration: 2030-11-11

Abstract

The utility model discloses a nail coiling machine inversion type direct current welding power supply, which comprises a common frequency rectification circuit, an inversion circuit, a high frequency transformation circuit and a high frequency rectification filter circuit; the input end of the common frequency rectification circuit is connected with 380V/50HZ three-phase alternating current input, and the output end of the common frequency rectification circuit is electrically connected with the input end of the inverter circuit. The inversion type direct current welding power supply of the nail coiling machine provided by the invention realizes high working frequency of 20KHZ and direct current welding, and breaks through the bottleneck that the working frequency of the inversion nail coiling machine cannot exceed 1 KHZ; the soft switch phase-shift control driver is connected to successfully solve the problems of impact and higher harmonic interference generated during multi-cycle segmented welding and soft start of an inverter power supply with slow response, all devices participating in welding are integrated together to form the inverter direct-current welding power supply special for the nail rolling machine completely separated from equipment, so that the volume and the weight of the adopted devices are reduced, and the maintenance and the replacement are more convenient.

Description

Inversion type direct current welding power supply of nail rolling machine

Technical Field

The utility model relates to roll up nail machine working power supply technical field, in particular to roll up nail machine invertion formula direct current welding power supply.

Background

At present, domestic and foreign coil nail production enterprises face three biggest problems:

1. the most main working part of the nail rolling machine is a welding power supply, and due to large workload and high load, a module, a welding transformer and related devices are frequently damaged.

2. The Darlington module of the core control device stops producing for more than ten years, is expensive and is not easy to purchase.

3. The main circuit has a complex structure, the welding power supply and the equipment are unified, and only a very professional person can understand the maintenance, so the welding machine is very inconvenient.

Because coil nail manufacturing enterprises mostly connect foreign orders, once equipment is damaged, delivery delay is often caused, and huge economic loss is brought, while power supplies used by domestic and foreign coil nail machines are all inverter type alternating current welding power supplies, and because the increase of the working frequency of the alternating current power supplies can cause the increase of the internal resistance of the magnetic flux of a welding transformer of a welding loop to reduce the welding current, the inverter frequency cannot exceed one kilohertz; in order to meet the requirement of high-speed welding, only a high-speed switching device can be used for low-frequency control, the conventional switching devices are a Darlington module and an IGBT module, the modules and related devices are frequently damaged due to unreasonable circuit application, and meanwhile, the high-speed welding cannot be really realized due to the limitation of working frequency.

Although a proposal that an inverter type direct current welding power supply is used for welding of the nail rolling machine is proposed, the difficulty of circuit realization and the particularity of nail rolling welding cannot be really realized.

The working process of the original inverter type alternating current welding power supply comprises the following two steps:

first, two-phase 380V alternating current → transformation 220V alternating current → rectification → inversion → voltage reduction → alternating current output.

And the second three-phase 380V alternating current → rectification → inversion → voltage reduction → alternating current output.

All power supplies used by the external nail crimping machine are alternating current welding power supplies, and the external nail crimping machine is low in frequency, high in energy consumption, poor in high-speed welding performance, easy to damage and inconvenient to maintain; the Darlington module adopted in the circuit is stopped for more than ten years, is expensive and is not easy to purchase; in order to solve the problems, an inverter type direct current welding power supply of a nail coiling machine is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an inversion type direct current welding power supply for a nail rolling machine, which breaks through the bottleneck that the working frequency of the inversion nail rolling machine can not exceed 1 KHZ; the soft start problem of inverter power supply slow response is solved, the power supply is convenient to maintain and replace, and the problems that the requirement of high-speed welding cannot be met, the working stability is not high, and the maintenance and the replacement are not changed in the background technology are solved.

In order to achieve the above object, the utility model provides a following technical scheme: an inverter type direct current welding power supply of a nail coiling machine comprises a common frequency rectifying circuit, an inverter circuit, a high frequency transformation circuit and a high frequency rectifying and filtering circuit; the input end of the common-frequency rectification circuit is connected with a 380V/50HZ three-phase alternating current input, the output end of the common-frequency rectification circuit is electrically connected with the input end of the inverter circuit, the output end of the inverter circuit is electrically connected with the input end of the high-frequency transformation circuit, the output end of the high-frequency transformation circuit is electrically connected with the input end of the high-frequency rectification filter circuit, and the output end of the high-frequency rectification filter circuit is connected with the output terminal for output; the output end of the high-frequency voltage transformation circuit is connected with a degaussing circuit; the input end of the inverter circuit is connected with a soft switching phase-shifting control driver, the output end of the soft switching phase-shifting control driver is connected with a PWM circuit, the output end of the PWM circuit is connected with a current feedback circuit, and the current feedback circuit is connected to the output end of the high-frequency rectification filter circuit; the output end of the common frequency rectification circuit is connected with a protection circuit.

Preferably, the common-frequency rectifying circuit takes a rectifying bridge U1 as a processing unit, the input end of the rectifying bridge U1 is connected to the output end of an air switch QF, and the input end of the air switch QF is connected to a 380V/50HZ three-phase alternating current input.

Preferably, the inverter circuit is composed of a high-frequency switching tube IGBT1, a high-frequency switching tube IGBT2, a high-frequency switching tube IGBT3, a high-frequency switching tube IGBT4 and a transformer T2, wherein 4 pins of the high-frequency switching tube IGBT1 and 4 pins of the high-frequency switching tube IGBT3 are connected and then connected to the positive output end of the rectifier bridge U1, 5 pins of the high-frequency switching tube IGBT1 and 6 pins of the high-frequency switching tube IGBT2 are connected and then connected to 1 pin of the transformer T2, 7 pins of the high-frequency switching tube IGBT2 and 7 pins of the high-frequency switching tube IGBT4 are connected to the negative output end of the rectifier bridge U1, 5 pins of the high-frequency switching tube IGBT3 and 6 pins of the high-frequency switching tube IGBT4 are connected and then connected to 1 pin of the transformer T1, 2 pins of the transformer T1 are connected to the input end of the capacitor C7, and the output end of the capacitor C7 is connected to 2 pin of the transformer T2.

Preferably, the high-frequency voltage conversion circuit consists of a transformer T1, a fast recovery diode D5-a fast recovery diode D8, a resistor R4-a resistor R8, a capacitor C8-a capacitor C11, wherein a pin 3 of the transformer T1 is connected to input terminals of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8,

pins

4 and 5 of the transformer T1 are connected to negative welding terminal outputs, a pin 6 of the transformer T1 is connected to input terminals of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8, and output terminals of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8 are connected and then connected to a positive welding terminal output; the capacitor C8 is connected with the resistor R4 in series, the input end of the capacitor C8 is connected to the input end of the fast recovery diode D5, and the output end of the resistor R4 is connected with the output end of the fast recovery diode D5; the capacitor C9 is connected with the resistor R5 in series, the input end of the capacitor C9 is connected to the input end of the fast recovery diode D6, and the output end of the resistor R5 is connected with the output end of the fast recovery diode D6; the capacitor C10 is connected with the resistor R6 in series, the input end of the capacitor C10 is connected to the input end of the fast recovery diode D7, and the output end of the resistor R6 is connected with the output end of the fast recovery diode D7; the capacitor C11 is connected in series with the resistor R7, the input end of the capacitor C11 is connected to the input end of the fast recovery diode D8, and the output end of the resistor R7 is connected with the output end of the fast recovery diode D8.

Preferably, the input terminal of the soft-switching phase shift control driver is connected to the output terminal of the air switch QF, the soft-switching phase shift control driver is composed of a chip U05, an amplifier U01A, a chip U02A, an amplifier U03D, an amplifier U04A, an amplifier U04B, a transformer T3 and a transformer T4, pins 1 and 3 of a chip U05 are connected to the output terminal of a rectifier bridge U1, pin 10 of a chip U05 is connected to the positive terminal of an amplifier U03A, the negative terminal of the amplifier U01A is connected to the output terminal and then connected to pins 4 and 10 of a chip U02A, pin 8 of the chip U02A is connected to pins 14 and 11 of a chip U05, pin 10 of the chip U02 05 is connected to pin 14 of the chip U05, pin 1 of the chip U02 05 is connected to pin 3 of the amplifier U04 05 and pin 12 of the amplifier U04 05, pin 13 of the chip U02 05 is connected to pin 2 of the amplifier U05, pin 12 of the amplifier U04 is connected to the amplifier U05, pin 05 is connected to the pin 05 of the amplifier U04, and is connected to pin 16 of the chip U05, and pins 12 and 13 of the amplifier U03D are connected to the power supply terminal input; a pin 1 of the amplifier U04A is connected to a pin 2 of a transformer T3, a pin 13 of the amplifier U04B is connected to a pin 1 of a transformer T3, a pin 3 of the transformer T3 is connected to a G1 terminal output, a pin 4 of a transformer T3 is connected to an E1 terminal output, a pin 5 of the transformer T3 is connected to an E2 terminal output, and a pin 6 of the transformer T3 is connected to a G2 terminal output; the pin 14 of the chip U05 is connected to the pin 1 of the transformer T4, the pin 11 of the chip U05 is connected to the pin 2 of the transformer T4, the pin 3 of the transformer T4 is connected to the output of the G3 terminal, the pin 4 of the transformer T4 is connected to the output of the E3 terminal, the pin 5 of the transformer T4 is connected to the output of the E4 terminal, and the pin 6 of the transformer T4 is connected to the output of the G4 terminal.

Preferably, the protection circuit comprises a fan M, a rectifier B1, a switch J1, a switch J2, a power transformer T5 and a triode N1, wherein a terminal a, a terminal B and a terminal C of the protection circuit are connected with the input of the output end of the air switch QF, the input end of the fan M is connected to the terminal B, the output end of the fan M is connected to the output end of the switch J1 and the input end of the switch J2, a pin 1 of the rectifier B1 is connected to the output end of the resistor R1, and the input end of the resistor R1 is connected with a pin 2 of the rectifier B1 and then connected to the terminal B; a pin 3 of the rectifier B1 is connected to the input end of the resistor R9, the input end of the capacitor E1 and the anode of the diode Z2, the output end of the resistor R9 is connected to the anode input end of the switch J1 and the anode input end of the switch J2, and a pin 4 of the rectifier B1, the output end of the capacitor E1 and the cathode input end of the switch J1 are connected and then grounded; the output end of the switch J1 is connected with the output end of a power transformer T5, and the input end of the power transformer T5 is connected with the power input; the negative electrode of the switch J2 is connected to the collector of the triode N1, the emitter of the triode N1 is grounded, the base of the triode N1 is connected to the output end of the resistor R10, and the output end of the resistor R3 is connected to the negative electrode of the diode Z2.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a nail winder invertion formula direct current welding power, realized 20 KHZ's high operating frequency and direct current welding, broken through the bottleneck that invertion nail winder operating frequency can't exceed 1 KHZ; the soft switch phase shift control driver is accessed to successfully solve the impact and higher harmonic interference generated during multi-cycle segmented welding, the soft start problem of the inverter power supply with slow response is solved, all the devices participating in welding are integrated together, a special inverter direct current welding power supply for the nail rolling machine completely separated from equipment is manufactured, the volume and the weight of the adopted devices are reduced, the welding part which is easily damaged by the nail rolling machine is completely separated from the equipment, once the welding power supply has problems, a plurality of connecting wires can be simply disassembled, another welding power supply is replaced, the equipment can be restarted for welding after several minutes, and the maintenance and the replacement are more convenient.

Drawings

FIG. 1 is an overall schematic block diagram of the present invention;

FIG. 2 is a schematic diagram of a main circuit of the present invention;

FIG. 3 is a connection diagram of the inverter circuit and the high frequency transformer circuit of the present invention;

FIG. 4 is a schematic diagram of the soft switch phase shift control driver of the present invention;

fig. 5 is a protection circuit diagram of the present invention.

In the figure: 1. a common frequency rectification circuit; 2. an inverter circuit; 3. a high-frequency voltage transformation circuit; 4. a high-frequency rectifying and filtering circuit; 5. a degaussing circuit; 6. a soft switching phase shift control driver; 7. and a protection circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, an inverter type dc welding power supply for nail coiling machine includes a common frequency rectification circuit 1, an inverter circuit 2, a high frequency transformation circuit 3 and a high frequency rectification filter circuit 4; the input end of the common-frequency rectification circuit 1 is connected with a 380V/50HZ three-phase alternating current input, the output end of the common-frequency rectification circuit 1 is electrically connected with the input end of the inverter circuit 2, the output end of the inverter circuit 2 is electrically connected with the input end of the high-frequency transformation circuit 3, the output end of the high-frequency transformation circuit 3 is electrically connected with the input end of the high-frequency rectification filter circuit 4, and the output end of the high-frequency rectification filter circuit 4 is connected with the output terminal for output; the output end of the high-frequency transformation circuit 3 is connected with a degaussing circuit 5; the input end of the inverter circuit 2 is connected with a soft switching phase shift control driver 6, the output end of the soft switching phase shift control driver 6 is connected with a PWM circuit, the output end of the PWM circuit is connected with a current feedback circuit, and the current feedback circuit is connected to the output end of the high-frequency rectification filter circuit 4; the output end of the common frequency rectification circuit 1 is connected with a protection circuit 7.

Referring to fig. 2, the common frequency rectification circuit 1 uses a rectification bridge U1 as a processing unit, an input terminal of the rectification bridge U1 is connected to an output terminal of an air switch QF, and an input terminal of the air switch QF is connected to a 380V/50HZ three-phase alternating current input.

Referring to fig. 3, the inverter circuit 2 is composed of a high-frequency switching tube IGBT1, a high-frequency switching tube IGBT2, a high-frequency switching tube IGBT3, a high-frequency switching tube IGBT4 and a transformer T2, wherein 4 pins of the high-frequency switching tube IGBT1 and 4 pins of the high-frequency switching tube IGBT3 are connected to an anode output terminal of the rectifier bridge U1 after being connected to each other, 5 pins of the high-frequency switching tube IGBT1 and 6 pins of the high-frequency switching tube IGBT2 are connected to a 1 pin of the transformer T2 after being connected to each other, 7 pins of the high-frequency switching tube IGBT2 and 7 pins of the high-frequency switching tube IGBT4 are connected to a cathode output terminal of the rectifier bridge U1, 5 pins of the high-frequency switching tube IGBT3 and 6 pins of the high-frequency switching tube IGBT4 are connected to a 1 pin of the transformer T1, 2 pins of the transformer T1 are connected to an input terminal of the capacitor C7, and an output terminal of the capacitor C7 is connected to a 2 pin of the transformer T2; the high-frequency transformation circuit 3 is composed of a transformer T1, a fast recovery diode D5-a fast recovery diode D8, a resistor R4-a resistor R8, a capacitor C8-a capacitor C11, wherein a pin 3 of the transformer T1 is connected to input ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8,

pins

4 and 5 of the transformer T1 are connected with negative welding terminals for output, a pin 6 of the transformer T1 is connected to input ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8, and output ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8 are connected and then connected with a positive welding terminal for output; the capacitor C8 is connected in series with the resistor R4, the input end of the capacitor C8 is connected to the input end of the fast recovery diode D5, and the output end of the resistor R4 is connected with the output end of the fast recovery diode D5; the capacitor C9 is connected in series with the resistor R5, the input end of the capacitor C9 is connected to the input end of the fast recovery diode D6, and the output end of the resistor R5 is connected with the output end of the fast recovery diode D6; the capacitor C10 is connected in series with the resistor R6, the input end of the capacitor C10 is connected to the input end of the fast recovery diode D7, and the output end of the resistor R6 is connected with the output end of the fast recovery diode D7; the capacitor C11 is connected in series with the resistor R7, the input terminal of the capacitor C11 is connected to the input terminal of the diode D8, and the output terminal of the resistor R7 is connected to the output terminal of the fast recovery diode D8.

Referring to fig. 4, an input terminal of the soft-switching phase shift control driver 6 is connected to an output terminal of the air switch QF, the soft-switching phase shift control driver 6 is composed of a chip U05, an amplifier U01A, a chip U02A, an amplifier U03D, an amplifier U04A, an amplifier U04B, a transformer T3 and a transformer T4, pins 1 and 3 of the chip U05 are connected to an output terminal of a rectifier bridge U1, pin 10 of the chip U05 is connected to an anode of the amplifier U01A, a cathode of the amplifier U01A is connected to an output terminal and then connected to pins 4 and 10 of the chip U02A, pin 8 of the chip U02A is connected to pins 14 and 11 of the chip U05, pin 10 of the chip U02 05 is connected to pin 14 of the chip U05, pin 1 of the chip U02 05 is connected to pin 3 of the amplifier U04 05 and to pin 12 of the amplifier U04 05, pin 13 of the chip U02 05 is connected to pin 2 of the amplifier U04, pin 05 is connected to the amplifier U04, pin 05 of the amplifier U04 is connected to pin 05, and is connected to pin 16 of the chip U05, and pins 12 and 13 of the amplifier U03D are connected to the power supply terminal input; pin 1 of the amplifier U04A is connected to pin 2 of the transformer T3, pin 13 of the amplifier U04B is connected to pin 1 of the transformer T3, pin 3 of the transformer T3 is connected to the G1 terminal output, pin 4 of the transformer T3 is connected to the E1 terminal output, pin 5 of the transformer T3 is connected to the E2 terminal output, and pin 6 of the transformer T3 is connected to the G2 terminal output; pin 14 of chip U05 is connected to pin 1 of transformer T4, pin 11 of chip U05 is connected to pin 2 of transformer T4, pin 3 of transformer T4 is connected to terminal output G3, pin 4 of transformer T4 is connected to terminal output E3, pin 5 of transformer T4 is connected to terminal output E4, and pin 6 of transformer T4 is connected to terminal output G4.

Referring to fig. 5, the protection circuit 7 includes a fan M, a rectifier B1, a switch J1, a switch J2, a power transformer T5, and a transistor N1, where a terminal a, a terminal B, and a terminal C of the protection circuit 7 are connected to an output terminal of the air switch QF, an input terminal of the fan M is connected to the terminal B, an output terminal of the fan M is connected to an output terminal of a switch J1 and an input terminal of a switch J2, a pin 1 of the rectifier B1 is connected to an output terminal of a resistor R1, and an input terminal of a resistor R1 is connected to the terminal B after being connected to a pin 2 of the rectifier B1; a pin 3 of the rectifier B1 is connected to the input end of the resistor R9, the input end of the capacitor E1 and the anode of the diode Z2, the output end of the resistor R9 is connected to the anode input end of the switch J1 and the anode input end of the switch J2, and a pin 4 of the rectifier B1, the output end of the capacitor E1 and the cathode input end of the switch J1 are connected and then grounded; the output end of the switch J1 is connected with the output end of the power transformer T5, and the input end of the power transformer T5 is connected with the power input; the negative electrode of the switch J2 is connected to the collector of the transistor N1, the emitter of the transistor N1 is grounded, the base of the transistor N1 is connected to the output end of the resistor R10, and the output end of the resistor R3 is connected to the negative electrode of the diode Z2.

The inverter type direct current welding power supply of the nail coiling machine has the working principle as follows: 380V/50HZ three-phase alternating current is input, enters a rectifier bridge U1 through an air switch QF, is rectified and filtered through a large-capacity electrolytic capacitor to form stable direct current, is chopped by a high-frequency switching tube IGBT 1-a high-frequency switching tube IGBT4 controlled by a PWM circuit to form high-frequency alternating current square waves, is subjected to power conversion through a transformer T1, and is rectified and output by a fast recovery diode D5-a fast recovery diode D8 after voltage reduction; the primary side of the transformer T1 is detected by a current transformer, sampled and sent to a PWM circuit for real-time control, and the welding frequency, the welding heat and the welding time knob switch on the front panel of the welding machine are adjusted, so that the output power of the welding machine can be adjusted; the 1KA high-current fast recovery diode D5-fast recovery diode D8 is adopted, and a filter circuit is added, so that the working reliability is ensured; because the output current of the intermediate frequency transformer is not reduced due to the increase of the frequency during the direct current output, the high working frequency of 20KHZ and the direct current output current of more than 3000A at the moment are realized, the bottleneck that the working frequency of an inverter nail coiling machine cannot exceed 1KHZ is broken through, meanwhile, the volume of the high frequency transformer is very small due to the improvement of the working frequency, and the reliability of the circuit is improved by connecting the demagnetization circuit 5.

The welding of the coil nails needs to be carried out dozens of times per second, the time of each coil nail is only 3-10 milliseconds during normal work, the welding and the turn-off needs to be carried out 6-10 times within such a short time, in order to ensure the welding performance, the circuit turn-off to the working current 3000 and 4000A each time needs to be realized within 0.1 millisecond, although the frequency is very high during the work of the inverter, the core control chips are all voltage or current type pulse width modulators, the soft start process needs to be carried out at the moment of the turn-off and turn-on of the circuit, the time of the general soft start needs dozens to hundreds of milliseconds, the normal mode can not be realized at all during the circuit design, and the IGBT of the main module can be damaged by just connecting the communication signal; by connecting the soft switch phase shift control driver 6, the impact on the IGBT of the main circuit switch device is very small when the circuit is switched on and off, and the stable and rapid welding of the coil nail is ensured.

Because it is abominable to roll up nailing machine operational environment, and the metal dust is many, often has the nail that drops, blocks the fan flabellum, causes fan and welding power supply overheat damage, though there is temperature switch in the circuit, but temperature switch response is more dull, also causes the damage of IGBT module and main transformer easily, consequently inserts protection circuit 7, when fan M's flabellum was blockked by foreign matter such as iron nail, closes fan M and welding control circuit, has avoided the power to have overheated damage after the forced air cooling.

The utility model provides a nail winder invertion formula direct current welding power, realized 20 KHZ's high operating frequency and direct current welding, broken through the bottleneck that invertion nail winder operating frequency can't exceed 1 KHZ; the soft switch phase shift control driver 6 is accessed to successfully solve the impact and higher harmonic interference generated during multi-cycle segmented welding, the soft start problem of the inverter power supply with slow response is solved, all the devices participating in welding are integrated together, a special inverter direct current welding power supply for the nail rolling machine completely separated from equipment is manufactured, the volume and the weight of the adopted devices are reduced, the welding part which is easily damaged by the nail rolling machine is completely separated from the equipment, once the welding power supply has problems, a plurality of connecting wires can be simply disassembled, another welding power supply is replaced, the equipment can be restarted for welding after several minutes, and the maintenance and the replacement are more convenient.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An inverter type direct current welding power supply of a nail coiling machine is characterized by comprising a common frequency rectification circuit (1), an inverter circuit (2), a high frequency transformation circuit (3) and a high frequency rectification filter circuit (4); the input end of the common-frequency rectification circuit (1) is connected with a 380V/50HZ three-phase alternating current input, the output end of the common-frequency rectification circuit (1) is electrically connected with the input end of the inverter circuit (2), the output end of the inverter circuit (2) is electrically connected with the input end of the high-frequency voltage transformation circuit (3), the output end of the high-frequency voltage transformation circuit (3) is electrically connected with the input end of the high-frequency rectification filter circuit (4), and the output end of the high-frequency rectification filter circuit (4) is connected with the output terminal for output; the output end of the high-frequency voltage transformation circuit (3) is connected with a degaussing circuit (5); the input end of the inverter circuit (2) is connected with a soft switching phase-shifting control driver (6), the output end of the soft switching phase-shifting control driver (6) is connected with a PWM circuit, the output end of the PWM circuit is connected with a current feedback circuit, and the current feedback circuit is connected to the output end of the high-frequency rectification filter circuit (4); the output end of the common frequency rectification circuit (1) is connected with a protection circuit (7).

2. The inverter type direct current welding power supply of the nail coiling machine as claimed in claim 1, characterized in that: the common-frequency rectification circuit (1) takes a rectification bridge U1 as a processing unit, the input end of the rectification bridge U1 is connected to the output end of an air switch QF, and the input end of the air switch QF is connected to a 380V/50HZ three-phase alternating current input.

3. The inverter type direct current welding power supply of the nail coiling machine as claimed in claim 1, characterized in that: the inverter circuit (2) is composed of a high-frequency switch tube IGBT1, a high-frequency switch tube IGBT2, a high-frequency switch tube IGBT3, a high-frequency switch tube IGBT4 and a transformer T2, wherein 4 feet of the high-frequency switch tube IGBT1 and 4 feet of the high-frequency switch tube IGBT3 are connected and then connected to the positive electrode output end of a rectifier bridge U1, 5 feet of the high-frequency switch tube IGBT1 are connected with 6 feet of a high-frequency switch tube IGBT2 and then connected to 1 foot of the transformer T2, 7 feet of the high-frequency switch tube IGBT2 and 7 feet of the high-frequency switch tube IGBT4 are connected to the negative electrode output end of the rectifier bridge U1, 5 feet of the high-frequency switch tube IGBT3 are connected with 6 feet of the high-frequency switch tube IGBT4 and then connected to 1 foot of the transformer T1, 2 feet of the transformer T1 are connected to the input end of a capacitor C7, and the output end of a capacitor C7 is connected to 2 feet of the transformer T2.

4. The inverter type direct current welding power supply of the nail coiling machine as claimed in claim 1, characterized in that: the high-frequency transformation circuit (3) consists of a transformer T1, a fast recovery diode D5, a fast recovery diode D8, a resistor R4, a resistor R8 and a capacitor C8-a capacitor C11, wherein a pin 3 of the transformer T1 is connected to input ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8, pins 4 and 5 of the transformer T1 are connected with negative welding terminals for output, a pin 6 of the transformer T1 is connected to input ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8, and output ends of the fast recovery diode D5, the fast recovery diode D6, the fast recovery diode D7 and the fast recovery diode D8 are connected and then connected with positive welding terminals for output; the capacitor C8 is connected with the resistor R4 in series, the input end of the capacitor C8 is connected to the input end of the fast recovery diode D5, and the output end of the resistor R4 is connected with the output end of the fast recovery diode D5; the capacitor C9 is connected with the resistor R5 in series, the input end of the capacitor C9 is connected to the input end of the fast recovery diode D6, and the output end of the resistor R5 is connected with the output end of the fast recovery diode D6; the capacitor C10 is connected with the resistor R6 in series, the input end of the capacitor C10 is connected to the input end of the fast recovery diode D7, and the output end of the resistor R6 is connected with the output end of the fast recovery diode D7; the capacitor C11 is connected in series with the resistor R7, the input end of the capacitor C11 is connected to the input end of the fast recovery diode D8, and the output end of the resistor R7 is connected with the output end of the fast recovery diode D8.

5. The inverter type direct current welding power supply of the nail coiling machine as claimed in claim 1, characterized in that: the input end of the soft switching phase shift control driver (6) is connected to the output end of the air switch QF, the soft switching phase shift control driver (6) is composed of a chip U05, an amplifier U01A, a chip U02A, an amplifier U03D, an amplifier U04A, an amplifier U04B, a transformer T3 and a transformer T4, pins 1 and 3 of the chip U05 are connected with the output end of a rectifier bridge U1, pin 10 of the chip U05 is connected to the anode of the amplifier U01A, the cathode of the amplifier U01A is connected with the output end and then connected to pins 4 and 10 of the chip U02A, pin 8 of the chip U02A is connected to pins 14 and 11 of the chip U05, pin 10 of the chip U02 05 is connected to pin 14 of the chip U05, pin 1 of the chip U02 05 is connected to pin 3 of the amplifier U04 05 and to pin 12 of the amplifier U04, pin 13 of the chip U02 05 is connected to pin 2 of the amplifier U04, pin 05 of the amplifier U04 is connected to the pin 05 of the amplifier U04, pin 05 is connected to the amplifier U04, pin 05 of the amplifier U04 and the pin 05 of the amplifier U05 is connected to the pin 05, and is connected to pin 16 of the chip U05, and pins 12 and 13 of the amplifier U03D are connected to the power supply terminal input; a pin 1 of the amplifier U04A is connected to a pin 2 of a transformer T3, a pin 13 of the amplifier U04B is connected to a pin 1 of a transformer T3, a pin 3 of the transformer T3 is connected to a G1 terminal output, a pin 4 of a transformer T3 is connected to an E1 terminal output, a pin 5 of the transformer T3 is connected to an E2 terminal output, and a pin 6 of the transformer T3 is connected to a G2 terminal output; the pin 14 of the chip U05 is connected to the pin 1 of the transformer T4, the pin 11 of the chip U05 is connected to the pin 2 of the transformer T4, the pin 3 of the transformer T4 is connected to the output of the G3 terminal, the pin 4 of the transformer T4 is connected to the output of the E3 terminal, the pin 5 of the transformer T4 is connected to the output of the E4 terminal, and the pin 6 of the transformer T4 is connected to the output of the G4 terminal.

6. The inverter type direct current welding power supply of the nail coiling machine as claimed in claim 1, characterized in that: the protection circuit (7) comprises a fan M, a rectifier B1, a switch J1, a switch J2, a power transformer T5 and a triode N1, wherein a terminal A, a terminal B and a terminal C of the protection circuit (7) are connected with the input end of an air switch QF, the input end of the fan M is connected to the terminal B, the output end of the fan M is connected to the output end of a switch J1 and the input end of a switch J2, a pin 1 of the rectifier B1 is connected to the output end of a resistor R1, and the input end of a resistor R1 is connected to the terminal B after being connected with a pin 2 of the rectifier B1; a pin 3 of the rectifier B1 is connected to the input end of the resistor R9, the input end of the capacitor E1 and the anode of the diode Z2, the output end of the resistor R9 is connected to the anode input end of the switch J1 and the anode input end of the switch J2, and a pin 4 of the rectifier B1, the output end of the capacitor E1 and the cathode input end of the switch J1 are connected and then grounded; the output end of the switch J1 is connected with the output end of a power transformer T5, and the input end of the power transformer T5 is connected with the power input; the negative electrode of the switch J2 is connected to the collector of the triode N1, the emitter of the triode N1 is grounded, the base of the triode N1 is connected to the output end of the resistor R10, and the output end of the resistor R3 is connected to the negative electrode of the diode Z2.