A high frequency inverter DC welding power supply circuit

Abstract

The present invention discloses a high-frequency inverter DC welding power supply circuit, which relates to the technical field of welding power supply, including a power supply module for power supply; a central control module for module control; a first conversion module for input rectification filtering, inversion regulation, electric energy compensation, high-frequency voltage conversion and output rectification filtering processing; a high-frequency switching module for fast-frequency pulse conversion processing; a second conversion module for input rectification filtering, inversion regulation, electric energy compensation, high-frequency voltage conversion and output rectification filtering processing; a high-frequency pulse module for high-frequency pulse regulation processing; a bidirectional compensation module for controlling the first conversion module and the second conversion module to perform bidirectional electric energy compensation work; and a welding load module for receiving electric energy and supplying power to a welding load. The high-frequency inverter DC welding power supply circuit of the present invention can provide pulse signals of various waveforms, increase the power supply range, improve the power supply stability, and improve the flexibility and adaptability of the welding load in the welding process.

Description

Technical Field

[0001] The invention relates to the technical field of welding power supplies, in particular to a high-frequency inverter direct current welding power supply circuit. Background Art

[0002] In the current electric welding machine market, the mainstream electric welding machine high-frequency inverter power supply is mainly based on a single voltage input. In order to achieve rapid rise and fall of the output pulse current to meet the requirements of high-frequency pulse square wave current output, the DC welding power supply in the prior art generally adopts a dual power supply circuit with a main power supply circuit topology. However, when the dual power supply circuit with the main power supply circuit topology is powered by a single power supply, the dual power supply circuits cannot compensate each other for electric energy, resulting in voltage instability when the single power supply is powered, resulting in reduced welding quality. In addition, the dual power supply circuit with the main power supply circuit topology can only provide limited types of pulse waveforms, and the flexibility and adaptability of the welding process are limited, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a high-frequency inverter DC welding power supply circuit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a high-frequency inverter DC welding power supply circuit is provided, comprising: a power supply module, a central control module, a first conversion module, a high-frequency switching module, a second conversion module, a high-frequency pulse module, a bidirectional compensation module and a welding load module;

[0005] A power module, used for receiving a first AC power;

[0006] A central control module, connected to the first conversion module, the second conversion module, the high-frequency switching module, the high-frequency pulse module and the bidirectional compensation module, configured to output a first pulse signal and control the inversion operation of the first conversion module, output a second pulse signal and control the inversion operation of the second conversion module, output a third pulse signal and a fourth pulse signal and control the high-frequency switching module to output a first pulse electric energy, output a fifth pulse signal and control the high-frequency pulse module to output a second pulse electric energy, and output a compensation signal and control the electric energy compensation operation of the bidirectional compensation module;

[0007] A first conversion module is connected to the power module and the bidirectional compensation module, and is used to perform rectification and filtering processing on the first AC power, and when receiving the first pulse signal, invert and adjust the processed power and output the second AC power, and perform high-frequency transformation and rectification and filtering processing on the second AC power or the power output after the second AC power and the first compensation power output by the bidirectional compensation module are superimposed, and output the first DC power;

[0008] A high-frequency switching module, connected to the first conversion module, for receiving the third pulse signal and the fourth pulse signal, performing fast-frequency pulse conversion processing on the first direct current electric energy, and outputting the first pulse electric energy;

[0009] a second conversion module, connected to the power module and the bidirectional compensation module, for rectifying and filtering the first AC power, inverting and regulating the processed power and outputting a third AC power upon receiving the second pulse signal, performing high-frequency transformation and rectifying and filtering on the third AC power or the third AC power and the second compensation power output by the bidirectional compensation module, and outputting a second DC power;

[0010] A high-frequency pulse module, connected to the second conversion module, configured to receive the fifth pulse signal, perform high-frequency pulse conditioning processing on the second DC power, and output second pulse power;

[0011] A bidirectional compensation module, configured to adjust the second AC power and output the first compensation power when receiving the compensation signal, adjust the third AC power and output the second compensation power, and stop receiving the compensation signal when receiving the third pulse signal and the fifth pulse signal;

[0012] The welding load module is connected to the high-frequency switching module and the high-frequency pulse module, and is used to receive the first pulse electric energy or the second pulse electric energy or the first pulse electric energy and the second pulse electric energy at the same time, and to supply power to the welding load.

[0013] As a further solution of the present invention: the power module includes a power interface; the first conversion module includes a first single-phase rectifier, a first capacitor, a first single-phase inverter, a second capacitor, a first high-frequency transformer, a first resistor, a first crystal diode, a fifth capacitor, a first inductor, a second crystal diode, a second resistor and a sixth capacitor; the central control module includes a central controller; the bidirectional compensation module includes a first compensation transformer;

[0014] Preferably, the first end and the second end of the power interface are respectively connected to the first end and the second end of the first single-phase rectifier, the third end of the first single-phase rectifier is connected to the first end of the first capacitor and the first end of the first single-phase inverter, the second end of the first single-phase inverter is connected to the other end of the first capacitor, the fourth end of the first single-phase rectifier and the ground, the third end of the first single-phase inverter is connected to the first end of the primary side of the first high-frequency transformer through the second capacitor, the fourth end of the first single-phase inverter is connected to the first end of the primary side of the first compensation transformer, the second end of the primary side of the first high-frequency transformer is connected to the second end of the primary side of the first compensation transformer, the first end of the secondary side of the first high-frequency transformer is connected to the anode of the first crystal diode and is connected to the cathode of the first crystal diode, the cathode of the second crystal diode, one end of the sixth capacitor and the first end of the first inductor through the first resistor and the fifth capacitor in sequence, the second end of the first high-frequency transformer is connected to the welding load module, the second end of the first inductor is connected to the high-frequency switching module, the other end of the sixth capacitor is connected to the anode of the second crystal diode and the third end of the secondary side of the first high-frequency transformer through the second resistor, and the fifth end of the first single-phase inverter is connected to the IO1 end of the central controller.

[0015] As a further solution of the present invention: the second conversion module includes a second single-phase rectifier, a third capacitor, a second single-phase inverter, a fourth capacitor, a second high-frequency transformer, a third crystal diode, a third resistor, a seventh capacitor, a fourth crystal diode, a fourth resistor, an eighth capacitor and a second inductor; the bidirectional compensation module also includes a second compensation transformer;

[0016] Preferably, the first end and the second end of the second single-phase rectifier are connected to the first end and the second end of the power interface respectively, the first end of the second single-phase inverter is connected to one end of the third capacitor and the third end of the second single-phase rectifier, the third end of the second single-phase inverter is connected to the first end of the primary side of the second high-frequency transformer through the fourth capacitor, the fourth end of the second single-phase inverter is connected to the first end of the primary side of the second compensation transformer, the second end of the primary side of the second compensation transformer is connected to the second end of the primary side of the second high-frequency transformer, the second end of the second single-phase inverter is connected to the other end of the third capacitor, the fourth end of the second single-phase rectifier and the ground, and the fifth end of the second single-phase inverter is connected to the ground. The first end of the secondary side of the second high-frequency transformer is connected to the anode of the third crystal diode and is connected to the cathode of the third crystal diode, the cathode of the fourth crystal diode, one end of the eighth capacitor and the first end of the second inductor in sequence through the third resistor and the seventh capacitor; the other end of the eighth capacitor is connected to the anode of the fourth crystal diode and the third end of the secondary side of the second high-frequency transformer through the fourth resistor; the second end of the secondary side of the second high-frequency transformer is connected to the welding load module; the second end of the second inductor is connected to the high-frequency pulse module; and the first end of the secondary side of the second compensation transformer is connected to the first end of the secondary side of the first compensation transformer.

[0017] As a further solution of the present invention: the bidirectional compensation module further includes a sixth crystal diode, a seventh crystal diode, a first thyristor, a first triode and a first logic gate device;

[0018] Preferably, the anode of the sixth crystal diode and the anode of the seventh crystal diode are respectively connected to the IO5 terminal and the IO6 terminal of the central controller, the cathode of the sixth crystal diode is connected to the A terminal of the first logic gate device, the cathode of the seventh crystal diode is connected to the B terminal of the first logic gate device, the Y terminal of the first logic gate device is connected to the base of the first transistor, the collector of the first transistor is connected to the control terminal of the first thyristor and the IO3 terminal of the central controller, one end of the first thyristor is connected to the second end of the secondary side of the first compensation transformer, and the other end of the first thyristor is connected to the second end of the secondary side of the second compensation transformer.

[0019] As a further solution of the present invention: the welding load module includes a welding load;

[0020] Preferably, the first end of the welding load is connected to the high-frequency switching module and the high-frequency pulse module, and the second end of the welding load is connected to the second end of the secondary side of the first high-frequency transformer and the second end of the secondary side of the second high-frequency transformer.

[0021] As a further solution of the present invention: the high-frequency switching module includes a second insulated gate transistor, a third insulated gate transistor, a sixth resistor, a ninth capacitor, a seventh resistor, a tenth capacitor and an eleventh capacitor;

[0022] Preferably, the collector of the second insulated gate transistor is connected to the collector of the third insulated gate transistor, one end of the seventh resistor and one end of the tenth capacitor and is connected to the emitter of the second insulated gate transistor and the second end of the welding load through the sixth resistor and the ninth capacitor in turn, the emitter of the third insulated gate transistor is connected to the other end of the tenth capacitor and the other end of the seventh resistor and is connected to the first end of the welding load through the eleventh capacitor, and the gate of the second insulated gate transistor and the gate of the third insulated gate transistor are respectively connected to the IO4 terminal and IO5 terminal of the central controller.

[0023] As a further solution of the present invention: the high-frequency pulse module includes a first insulated gate transistor, a fifth resistor, a twelfth capacitor and a fifth crystal diode;

[0024] Preferably, the collector of the first insulated gate transistor is connected to the second end of the second inductor and one end of the fifth resistor and is connected to the other end of the fifth resistor, the emitter of the first insulated gate transistor and the anode of the fifth crystal diode through the twelfth capacitor, the cathode of the fifth crystal diode is connected to the first end of the welding load, and the gate of the first insulated gate transistor is connected to the IO6 terminal of the central controller.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the high-frequency inverter DC welding power supply circuit of the present invention can be used by the first conversion module and the second conversion module to perform rectification filtering, inversion regulation and high-frequency voltage transformation processing on the power supply module respectively, and the high-frequency switching module can perform fast-frequency regulation processing to provide fast-frequency pulse electric energy with various waveforms, and the high-frequency pulse module can perform high-frequency regulation processing to provide pulse signals with various waveforms. At the same time, the high-frequency pulse module and the high-frequency switching module can jointly power the welding load, improve the power supply power, and improve the flexibility and adaptability of the welding load in the welding process. When power is supplied alone, the first conversion module can perform electric energy compensation work on the second conversion module through the bidirectional compensation module, and the second conversion module can perform electric energy compensation work on the first conversion module, thereby improving the power supply stability of the welding power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 A schematic block diagram of a high-frequency inverter DC welding power supply circuit provided by an embodiment of the present invention.

[0028] Figure 2 A circuit diagram of a high-frequency inverter DC welding power supply circuit provided in an embodiment of the present invention.

[0029] Figure 3 A circuit diagram of a high-frequency switching module provided in an embodiment of the present invention.

[0030] Figure 4 A circuit diagram of a bidirectional compensation module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In one embodiment, see Figure 1, a high-frequency inverter DC welding power supply circuit, comprising: a power supply module 1, a central control module 2, a first conversion module 3, a high-frequency switching module 4, a second conversion module 5, a high-frequency pulse module 6, a bidirectional compensation module 7 and a welding load module 8;

[0033] Specifically, the power module 1 is used to access the first AC power;

[0034] The central control module 2 is connected to the first conversion module 3, the second conversion module 5, the high-frequency switching module 4, the high-frequency pulse module 6 and the bidirectional compensation module 7, and is used to output a first pulse signal and control the inversion work of the first conversion module 3, output a second pulse signal and control the inversion work of the second conversion module 5, output a third pulse signal and a fourth pulse signal and control the high-frequency switching module 4 to output the first pulse electric energy, output a fifth pulse signal and control the high-frequency pulse module 6 to output the second pulse electric energy, and output a compensation signal and control the electric energy compensation work of the bidirectional compensation module 7;

[0035] The first conversion module 3 is connected to the power module 1 and the bidirectional compensation module 7, and is used to perform rectification and filtering processing on the first AC power, and when receiving the first pulse signal, perform inversion regulation on the processed power and output the second AC power, and perform high-frequency transformation and rectification and filtering processing on the second AC power or the second AC power and the first compensation power output by the bidirectional compensation module 7, and output the first DC power;

[0036] A high-frequency switching module 4 is connected to the first conversion module 3, and is used to receive the third pulse signal and the fourth pulse signal, perform fast-frequency pulse conversion processing on the first DC power, and output the first pulse power;

[0037] The second conversion module 5 is connected to the power module 1 and the bidirectional compensation module 7, and is used to perform rectification and filtering processing on the first AC power, and when receiving the second pulse signal, perform inversion regulation on the processed power and output the third AC power, and perform high-frequency transformation and rectification and filtering processing on the third AC power or the third AC power and the second compensation power output by the bidirectional compensation module 7, and output the second DC power;

[0038] A high-frequency pulse module 6, connected to the second conversion module 5, is used to receive the fifth pulse signal and perform high-frequency pulse regulation on the second DC power and output the second pulse power;

[0039] The bidirectional compensation module 7 is used to adjust the second AC power and output the first compensation power when receiving the compensation signal, adjust the third AC power and output the second compensation power, and stop receiving the compensation signal when receiving the third pulse signal and the fifth pulse signal;

[0040] The welding load module 8 is connected to the high-frequency switching module 4 and the high-frequency pulse module 6, and is used to receive the first pulse electric energy or the second pulse electric energy or the first pulse electric energy and the second pulse electric energy at the same time, and to supply power to the welding load.

[0041] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface to access AC power; the central control module 2 can adopt a central control circuit composed of a single-chip microcomputer, which integrates many components such as an arithmetic unit, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the first conversion module 3 can adopt a first conversion circuit composed of a rectifier, a capacitor, an inverter, a high-frequency transformer, a crystal diode, etc., which can perform input rectification and filtering, inversion regulation, high-frequency transformation and output rectification and filtering on the input electric energy; the high-frequency switching module 4 can adopt a high-frequency switching circuit composed of IGBT, a resistor, a capacitor, etc., which can perform fast-frequency pulse regulation on the electric energy output by the first conversion module 3, and output a variety of fast-frequency pulse waveforms. signal, and also absorbs peak electric energy to avoid current backflow; the above-mentioned second conversion module 5 can adopt a second conversion circuit composed of a rectifier, a capacitor, an inverter, a high-frequency transformer, a crystal diode, etc., which can perform input rectification filtering, inversion regulation, high-frequency transformation and output rectification filtering on the input electric energy; the above-mentioned high-frequency pulse module 6 can adopt a high-frequency pulse circuit composed of IGBT, a resistor and a capacitor, and perform high-frequency pulse regulation on the electric energy output by the second conversion module 5; the above-mentioned two-way compensation module 7 can adopt a two-way compensation circuit composed of a high-frequency transformer, a crystal diode, a thyristor, a logic gate device, etc., which can complete the mutual electric energy compensation between the first conversion module 3 and the second conversion module 5; the above-mentioned welding load module 8 can adopt a welding load circuit composed of a welding load to receive electric energy and perform welding work.

[0042] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 , the power module 1 includes a power interface; the first conversion module 3 includes a first single-phase rectifier T1, a first capacitor C1, a first single-phase inverter T2, a second capacitor C2, a first high-frequency transformer B1, a first resistor R1, a first crystal diode D1, a fifth capacitor C5, a first inductor L1, a second crystal diode D2, a second resistor R2 and a sixth capacitor C6; the central control module 2 includes a central controller U1; the bidirectional compensation module 7 includes a first compensation transformer B2;

[0043] Specifically, the first end and the second end of the power interface are respectively connected to the first end and the second end of the first single-phase rectifier T1, the third end of the first single-phase rectifier T1 is connected to the first end of the first capacitor C1 and the first end of the first single-phase inverter T2, the second end of the first single-phase inverter T2 is connected to the other end of the first capacitor C1, the fourth end of the first single-phase rectifier T1 and the ground, the third end of the first single-phase inverter T2 is connected to the first end of the primary side of the first high-frequency transformer B1 through the second capacitor C2, the fourth end of the first single-phase inverter T2 is connected to the first end of the primary side of the first compensation transformer B2, and the second end of the primary side of the first high-frequency transformer B1 is connected to the primary side of the first compensation transformer B2. The second end, the first end of the secondary side of the first high-frequency transformer B1 is connected to the anode of the first crystal diode D1 and is connected to the cathode of the first crystal diode D1, the cathode of the second crystal diode D2, one end of the sixth capacitor C6 and the first end of the first inductor L1 in sequence through the first resistor R1 and the fifth capacitor C5. The second end of the first high-frequency transformer B1 is connected to the welding load module 8, the second end of the first inductor L1 is connected to the high-frequency switching module 4, the other end of the sixth capacitor C6 is connected to the anode of the second crystal diode D2 and the third end of the secondary side of the first high-frequency transformer B1 through the second resistor R2, and the fifth end of the first single-phase inverter T2 is connected to the IO1 end of the central controller U1.

[0044] In a specific embodiment, the first single-phase inverter T2 can be an inverter composed of four groups of IGBTs; the first crystal diode D1, the first resistor R1, the fifth capacitor C5, the second crystal diode D2, the second resistor R2 and the sixth capacitor C6 can perform output rectification filtering and power absorption processing; the central controller U1 can be an STM32 microcontroller; the first high-frequency transformer B1 and the first compensation transformer B2 are both high-frequency transformers, wherein the first end and the second end of the secondary side of the first high-frequency transformer B1 are a group of secondary coils, and the second end and the third end are another group of secondary coils.

[0045] Further, the second conversion module 5 includes a second single-phase rectifier T3, a third capacitor C3, a second single-phase inverter T4, a fourth capacitor C4, a second high-frequency transformer B3, a third crystal diode D3, a third resistor R3, a seventh capacitor C7, a fourth crystal diode D4, a fourth resistor R4, an eighth capacitor C8 and a second inductor L2; the bidirectional compensation module 7 also includes a second compensation transformer B4;

[0046] Specifically, the first end and the second end of the second single-phase rectifier T3 are connected to the first end and the second end of the power interface respectively, the first end of the second single-phase inverter T4 is connected to one end of the third capacitor C3 and the third end of the second single-phase rectifier T3, the third end of the second single-phase inverter T4 is connected to the first end of the primary side of the second high-frequency transformer B3 through the fourth capacitor C4, the fourth end of the second single-phase inverter T4 is connected to the first end of the primary side of the second compensation transformer B4, the second end of the primary side of the second compensation transformer B4 is connected to the second end of the primary side of the second high-frequency transformer B3, the second end of the second single-phase inverter T4 is connected to the other end of the third capacitor C3, the fourth end of the second single-phase rectifier T3 and the ground, and the fifth end of the second single-phase inverter T4 is connected to the At the IO2 end of the central controller U1, the first end of the secondary side of the second high-frequency transformer B3 is connected to the anode of the third crystal diode D3 and is connected to the cathode of the third crystal diode D3, the cathode of the fourth crystal diode D4, one end of the eighth capacitor C8 and the first end of the second inductor L2 in sequence through the third resistor R3 and the seventh capacitor C7, the other end of the eighth capacitor C8 is connected to the anode of the fourth crystal diode D4 and the third end of the secondary side of the second high-frequency transformer B3 through the fourth resistor R4, the second end of the secondary side of the second high-frequency transformer B3 is connected to the welding load module 8, the second end of the second inductor L2 is connected to the high-frequency pulse module 6, and the first end of the secondary side of the second compensation transformer B4 is connected to the first end of the secondary side of the first compensation transformer B2.

[0047] In a specific embodiment, the second single-phase inverter T4 can be an inverter composed of four groups of IGBTs; the third crystal diode D3, the third resistor R3, the seventh capacitor C7, the fourth crystal diode D4, the fourth resistor R4 and the eighth capacitor C8 perform output rectification filtering and electric energy absorption processing; the second high-frequency transformer B3 and the second compensation transformer B4 are both high-frequency transformers, wherein the first end and the second end of the secondary side of the second high-frequency transformer B3 are a group of secondary coils, and the second end and the third end are another group of secondary coils.

[0048] Further, the bidirectional compensation module 7 also includes a sixth crystal diode D6, a seventh crystal diode D7, a first thyristor S1, a first transistor V1 and a first logic gate device U2;

[0049] Specifically, the anode of the sixth crystal diode D6 and the anode of the seventh crystal diode D7 are respectively connected to the IO5 terminal and the IO6 terminal of the central controller U1, the cathode of the sixth crystal diode D6 is connected to the A terminal of the first logic gate device U2, the cathode of the seventh crystal diode D7 is connected to the B terminal of the first logic gate device U2, the Y terminal of the first logic gate device U2 is connected to the base of the first transistor V1, the collector of the first transistor V1 is connected to the control terminal of the first thyristor S1 and the IO3 terminal of the central controller U1, one end of the first thyristor S1 is connected to the second end of the secondary side of the first compensation transformer B2, and the other end of the first thyristor S1 is connected to the second end of the secondary side of the second compensation transformer B4.

[0050] In a specific embodiment, the first thyristor S1 may be a bidirectional thyristor; the first transistor V1 may be an NPN transistor; and the first logic gate device U2 may be an AND gate chip.

[0051] Further, the welding load module 8 includes a welding load;

[0052] Specifically, the first end of the welding load is connected to the high-frequency switching module 4 and the high-frequency pulse module 6, and the second end of the welding load is connected to the second end of the secondary side of the first high-frequency transformer B1 and the second end of the secondary side of the second high-frequency transformer B3.

[0053] In a specific embodiment, the welding load is composed of an electrode and a workpiece to perform welding work.

[0054] Further, the high frequency switching module 4 includes a second insulated gate transistor Q2, a third insulated gate transistor Q3, a sixth resistor R6, a ninth capacitor C9, a seventh resistor R7, a tenth capacitor R10 and an eleventh capacitor R11;

[0055] Specifically, the collector of the second insulated gate transistor Q2 is connected to the collector of the third insulated gate transistor Q3, one end of the seventh resistor R7 and one end of the tenth capacitor R10, and is connected to the emitter of the second insulated gate transistor Q2 and the second end of the welding load through the sixth resistor R6 and the ninth capacitor C9 in sequence, the emitter of the third insulated gate transistor Q3 is connected to the other end of the tenth capacitor R10 and the other end of the seventh resistor R7 and is connected to the first end of the welding load through the eleventh capacitor R11, and the gate of the second insulated gate transistor Q2 and the gate of the third insulated gate transistor Q3 are respectively connected to the IO4 terminal and IO5 terminal of the central controller U1.

[0056] In a specific embodiment, the second insulated gate transistor Q2 and the third insulated gate transistor Q3 can both be IGBTs; the seventh resistor R7 and the tenth capacitor R10 can prevent the current reflux caused by the negative current generated when the sixth resistor R6 and the ninth capacitor C9 absorb electric energy when the second insulated gate transistor Q2 is turned on; the eleventh capacitor R11 increases the capacitive reactance of the output fast-frequency current to prevent current backflow.

[0057] Further, the high frequency pulse module 6 includes a first insulated gate transistor Q1, a fifth resistor R5, a twelfth capacitor C12 and a fifth crystal diode D5;

[0058] Specifically, the collector of the first insulated gate transistor Q1 is connected to the second end of the second inductor L2 and one end of the fifth resistor R5, and is connected to the other end of the fifth resistor R5, the emitter of the first insulated gate transistor Q1 and the anode of the fifth crystal diode D5 through the twelfth capacitor C12, the cathode of the fifth crystal diode D5 is connected to the first end of the welding load, and the gate of the first insulated gate transistor Q1 is connected to the IO6 terminal of the central controller U1.

[0059] In a specific embodiment, the first insulated gate transistor Q1 may be an IGBT, and the fifth resistor R5 and the twelfth capacitor C12 may be used for energy absorption.

[0060] In a high-frequency inverter DC welding power supply circuit of the present embodiment, DC power is connected by a power interface, and the first single-phase rectifier T1, the first capacitor C1 and the first single-phase inverter T2 perform rectification, filtering and inversion processing, and then the second capacitor C2 and the first high-frequency transformer B1 perform high-frequency voltage transformation processing, the first crystal diode D1, the second crystal diode D2, the second resistor R2, the sixth capacitor C6, the first resistor R1, the fifth capacitor C5 and the first inductor L1 perform rectification and filtering processing, and then output the first DC power, and similarly the second single-phase rectifier T3, the third capacitor C3, the second single-phase inverter T4, the fourth capacitor C4, The second high-frequency transformer B3, the third crystal diode D3, the third resistor R3, the seventh capacitor C7, the fourth crystal diode D4, the fourth resistor R4, the eighth capacitor C8 and the second inductor L2 perform rectification and filtering, inversion regulation, high-frequency transformation and output rectification and filtering processing and output the second DC power. The first DC power is processed by fast-frequency pulse regulation through the second insulated gate transistor Q2 and the third insulated gate transistor Q3, and can output a variety of different types of fast-frequency pulse power with pulse waveforms, namely, the first pulse power. The second DC power is processed by high-frequency pulse regulation through the first insulated gate transistor Q1, and can output a variety of different types of The high-frequency pulse signal, i.e., the second pulse electric energy, the first pulse electric energy and the second pulse electric energy can respectively provide different welding modes for the welding load, and when the first pulse electric energy and the second pulse electric energy are supplied together, the current of the pulse electric energy can be increased, and the welding power can be increased. When a single power supply is used, i.e., when the first pulse electric energy or the second pulse electric energy is provided, during the period of providing the first pulse electric energy, the operation of the first insulated gate transistor Q1 is stopped and the IO3 terminal of the central controller U1 controls the first thyristor S1 to be turned on, so that the third AC electric energy output by the second single-phase inverter T4 is transmitted through the second compensation transformer B4, and is regulated and output by the first thyristor S1. The compensation electric energy is used, and the first compensation transformer B2 uses the second compensation electric energy to perform voltage compensation on the second AC electric energy. Similarly, during the provision of the second pulse electric energy, the first thyristor S1 performs AC regulation and the second compensation transformer B4 provides the first compensation electric energy, and performs voltage compensation on the third AC electric energy to meet the stable power supply demand and improve the power supply accuracy. When the IO5 end of the central controller U1 controls the third insulated gate transistor Q3 to work and the IO6 end of the central controller U1 controls the first insulated gate transistor Q1 to work, the first logic gate device U2 will control the first transistor V1 to be turned on, so that the first thyristor S1 remains in the off state.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high frequency inverter DC welding power supply circuit, characterized in that: The high-frequency inverter DC welding power supply circuit comprises: a power supply module, a central control module, a first conversion module, a high-frequency switching module, a second conversion module, a high-frequency pulse module, a bidirectional compensation module and a welding load module; The power module is used to receive the first AC power; The central control module is connected to the first conversion module, the second conversion module, the high-frequency switching module, the high-frequency pulse module and the bidirectional compensation module, and is used to output a first pulse signal and control the inversion work of the first conversion module, output a second pulse signal and control the inversion work of the second conversion module, output a third pulse signal and a fourth pulse signal and control the high-frequency switching module to output the first pulse electric energy, output a fifth pulse signal and control the high-frequency pulse module to output the second pulse electric energy, and output a compensation signal and control the electric energy compensation work of the bidirectional compensation module; The first conversion module is connected to the power module and the bidirectional compensation module, and is used to perform rectification and filtering processing on the first AC power, and when receiving the first pulse signal, perform inversion regulation on the processed power and output the second AC power, and perform high-frequency transformation and rectification and filtering processing on the second AC power or the power output after the second AC power and the first compensation power output by the bidirectional compensation module are superimposed, and output the first DC power; The high-frequency switching module is connected to the first conversion module, and is used to receive the third pulse signal and the fourth pulse signal, perform fast-frequency pulse conversion processing on the first direct current power, and output the first pulse power; The second conversion module is connected to the power module and the bidirectional compensation module, and is used to perform rectification and filtering processing on the first AC power, and when receiving the second pulse signal, perform inversion regulation on the processed power and output the third AC power, and perform high-frequency transformation and rectification and filtering processing on the third AC power or the third AC power and the second compensation power output by the bidirectional compensation module, and output the second DC power; The high-frequency pulse module is connected to the second conversion module, and is used to receive the fifth pulse signal, perform high-frequency pulse regulation processing on the second DC power, and output the second pulse power; The bidirectional compensation module is used to adjust the second AC power and output the first compensation power when receiving the compensation signal, adjust the third AC power and output the second compensation power, and stop receiving the compensation signal when receiving the third pulse signal and the fifth pulse signal; The welding load module is connected to the high-frequency switching module and the high-frequency pulse module, and is used to receive the first pulse power energy or the second pulse power energy or the first pulse power energy and the second pulse power energy at the same time, and to supply power to the welding load; The power module includes a power interface; the first conversion module includes a first single-phase rectifier, a first capacitor, a first single-phase inverter, a second capacitor, a first high-frequency transformer, a first resistor, a first crystal diode, a fifth capacitor, a first inductor, a second crystal diode, a second resistor and a sixth capacitor; the central control module includes a central controller; the bidirectional compensation module includes a first compensation transformer; The first end and the second end of the power interface are respectively connected to the first end and the second end of the first single-phase rectifier, the third end of the first single-phase rectifier is connected to the first end of the first capacitor and the first end of the first single-phase inverter, the second end of the first single-phase inverter is connected to the other end of the first capacitor, the fourth end of the first single-phase rectifier and the ground, the third end of the first single-phase inverter is connected to the first end of the primary side of the first high-frequency transformer through the second capacitor, the fourth end of the first single-phase inverter is connected to the first end of the primary side of the first compensation transformer, the second end of the primary side of the first high-frequency transformer is connected to the second end of the primary side of the first compensation transformer, the first end of the secondary side of the first high-frequency transformer is connected to the anode of the first crystal diode and is connected to the cathode of the first crystal diode, the cathode of the second crystal diode, one end of the sixth capacitor and the first end of the first inductor through the first resistor and the fifth capacitor in sequence, the second end of the first high-frequency transformer is connected to the welding load module, the second end of the first inductor is connected to the high-frequency switching module, the other end of the sixth capacitor is connected to the anode of the second crystal diode and the third end of the secondary side of the first high-frequency transformer through the second resistor, and the fifth end of the first single-phase inverter is connected to the IO1 end of the central controller.

2. A high frequency inverter DC welding power supply circuit according to claim 1, characterized in that: The second conversion module includes a second single-phase rectifier, a third capacitor, a second single-phase inverter, a fourth capacitor, a second high-frequency transformer, a third crystal diode, a third resistor, a seventh capacitor, a fourth crystal diode, a fourth resistor, an eighth capacitor and a second inductor; the bidirectional compensation module also includes a second compensation transformer; The first end and the second end of the second single-phase rectifier are connected to the first end and the second end of the power interface respectively, the first end of the second single-phase inverter is connected to one end of the third capacitor and the third end of the second single-phase rectifier, the third end of the second single-phase inverter is connected to the first end of the primary side of the second high-frequency transformer through the fourth capacitor, the fourth end of the second single-phase inverter is connected to the first end of the primary side of the second compensation transformer, the second end of the primary side of the second compensation transformer is connected to the second end of the primary side of the second high-frequency transformer, the second end of the second single-phase inverter is connected to the other end of the third capacitor, the fourth end of the second single-phase rectifier and the ground, and the fifth end of the second single-phase inverter is connected to the ground. The IO2 terminal of the central controller is connected, the first end of the secondary side of the second high-frequency transformer is connected to the anode of the third crystal diode and is connected to the cathode of the third crystal diode, the cathode of the fourth crystal diode, one end of the eighth capacitor and the first end of the second inductor in sequence through the third resistor and the seventh capacitor, the other end of the eighth capacitor is connected to the anode of the fourth crystal diode and the third end of the secondary side of the second high-frequency transformer through the fourth resistor, the second end of the secondary side of the second high-frequency transformer is connected to the welding load module, the second end of the second inductor is connected to the high-frequency pulse module, and the first end of the secondary side of the second compensation transformer is connected to the first end of the secondary side of the first compensation transformer.

3. A high frequency inverter DC welding power supply circuit according to claim 2, characterized in that: The bidirectional compensation module also includes a sixth crystal diode, a seventh crystal diode, a first thyristor, a first triode and a first logic gate device; The anode of the sixth crystal diode and the anode of the seventh crystal diode are respectively connected to the IO5 terminal and the IO6 terminal of the central controller, the cathode of the sixth crystal diode is connected to the A terminal of the first logic gate device, the cathode of the seventh crystal diode is connected to the B terminal of the first logic gate device, the Y terminal of the first logic gate device is connected to the base of the first transistor, the collector of the first transistor is connected to the control terminal of the first thyristor and the IO3 terminal of the central controller, one end of the first thyristor is connected to the second end of the secondary side of the first compensation transformer, and the other end of the first thyristor is connected to the second end of the secondary side of the second compensation transformer.

4. A high frequency inverter DC welding power supply circuit according to claim 3, characterized in that: The welding load module includes a welding load; The first end of the welding load is connected to the high-frequency switching module and the high-frequency pulse module, and the second end of the welding load is connected to the second end of the secondary side of the first high-frequency transformer and the second end of the secondary side of the second high-frequency transformer.

5. A high frequency inverter DC welding power supply circuit according to claim 4, characterized in that: The high frequency switching module includes a second insulated gate transistor, a third insulated gate transistor, a sixth resistor, a ninth capacitor, a seventh resistor, a tenth capacitor and an eleventh capacitor; The collector of the second insulated gate transistor is connected to the collector of the third insulated gate transistor, one end of the seventh resistor and one end of the tenth capacitor, and is connected to the emitter of the second insulated gate transistor and the second end of the welding load through the sixth resistor and the ninth capacitor in turn. The emitter of the third insulated gate transistor is connected to the other end of the tenth capacitor and the other end of the seventh resistor and is connected to the first end of the welding load through the eleventh capacitor. The gate of the second insulated gate transistor and the gate of the third insulated gate transistor are respectively connected to the IO4 terminal and IO5 terminal of the central controller.

6. A high frequency inverter DC welding power supply circuit according to claim 4, characterized in that: The high-frequency pulse module includes a first insulated gate transistor, a fifth resistor, a twelfth capacitor and a fifth crystal diode; The collector of the first insulated gate transistor is connected to the second end of the second inductor and one end of the fifth resistor, and is connected to the other end of the fifth resistor, the emitter of the first insulated gate transistor and the anode of the fifth crystal diode through the twelfth capacitor, the cathode of the fifth crystal diode is connected to the first end of the welding load, and the gate of the first insulated gate transistor is connected to the IO6 terminal of the central controller.

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