A welding machine control circuit with adaptive switching between grid power and energy storage power supply

Abstract

The application discloses a welding machine control circuit for adaptive switching of a power grid power supply and an energy storage power supply, comprising a step-down inversion module for converting alternating current into high-frequency alternating current and then into low-voltage direct current output, comprising a first rectifier circuit, an inversion circuit and a switching power supply circuit, the input of the first rectifier circuit being connected with the power grid power supply, and the output of the first rectifier circuit being connected with the input of the inversion circuit, further comprising a step-up module and a switching circuit connected in sequence, the input of the step-up module being connected with the energy storage power supply, for stepping up the low voltage of the energy storage power supply to a set voltage value, the output of the switching circuit being connected with the input of the inversion circuit and the input of the switching power supply circuit respectively, and the switching circuit adaptively switching between the power grid power supply and the energy storage power supply according to the size of the output of the first rectifier circuit and the size of the set voltage value. The application switches and connects the inversion and step-down circuit through the power grid power supply and the energy storage power supply, simplifies the circuit structure and reduces the cost of the welding machine.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and in particular to a welding machine control circuit that adaptively switches between mains power and energy storage power. Background Technology

[0002] Currently, welding machines are powered in two ways: one is by energy storage batteries, and the other is by grid power. When powered by energy storage batteries, high-voltage DC battery packs are generally used. After the high-voltage DC battery packs are chopped down, the output current is controlled. When powered by grid power, the AC power from the grid is rectified and inverted, and then stepped down by a transformer to control the output current.

[0003] To expand the applicability of the welding machine, it is necessary to enable it to use grid power as well as energy storage power. When it is compatible with grid power and energy storage power, for safety reasons, it is necessary to solve the problem of electrical isolation between high voltage and low voltage. This requires equipping the energy storage power supply with one inverter step-down circuit and the grid power supply with another inverter step-down circuit. The two inverter step-down circuits make the circuit structure complex and the welding machine cost high.

[0004] Therefore, designing a simplified welding machine circuit that is compatible with both grid power and energy storage power supply, and reducing the cost of the welding machine, is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a welding machine control circuit that adaptively switches between grid power and energy storage power. The energy storage power is boosted to a set voltage value and connected to the front end of the inverter circuit and the front end of the switching power supply circuit via a switching circuit. When the rectified voltage of the grid power is greater than or equal to the set voltage value, the circuit switches to grid power supply; when the rectified voltage is less than the set voltage value, the circuit switches to energy storage power supply. This simplifies the circuit structure and reduces the cost of the welding machine by using only one inverter / step-down circuit, ensuring compatibility between the energy storage power and grid power.

[0006] Firstly, the above-mentioned objective of this invention is achieved through the following technical solution: A welding machine control circuit with adaptive switching between grid power and energy storage power includes a step-down inverter module for converting AC power into high-frequency AC power and then into low-voltage DC power output. The circuit includes a first rectifier circuit, an inverter circuit, and a switching power supply circuit. The input of the first rectifier circuit is connected to the grid power supply, and its output is connected to the input of the inverter circuit. The circuit also includes a boost module and a switching circuit connected in sequence. The input of the boost module is connected to the energy storage power supply, used to boost the low voltage of the energy storage power supply to a set voltage value. The output of the switching circuit is connected to the input of the inverter circuit and the input of the switching power supply circuit, respectively. The switching circuit adaptively switches between grid power and energy storage power supply according to the output of the first rectifier circuit and the set voltage value.

[0007] The present invention is further configured such that: the boost module includes a first boost module and a second boost module; the inputs of the first boost module and the second boost module are connected to an energy storage power source; the output of the first boost module is connected to the input of an inverter circuit after passing through a switching circuit; the switching circuit is used to provide power to the inverter circuit from the energy storage power source when the grid power supply does not meet the requirements; the output of the second boost module is connected to the input of a switching power supply circuit after passing through the switching circuit, and is used to provide power to the switching power supply circuit from the energy storage power source when the grid power supply does not meet the requirements.

[0008] The present invention is further configured such that: the first boost module includes a first boost circuit and a first PWM adjustment circuit connected in sequence; the first boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value; and the first PWM adjustment circuit is used to adjust the first PWM signal according to the output of the first boost circuit to stabilize the output of the first boost circuit.

[0009] The present invention is further configured such that: the first boost circuit includes a first BOOST boost topology circuit, and the first PWM adjustment circuit includes a first voltage sampling circuit and a first PWM adjustment chip connected in sequence; the first voltage sampling circuit samples the output of the first BOOST boost topology circuit, and the first PWM adjustment chip adjusts the output of the first PWM signal according to the magnitude of the first sampled voltage, thereby controlling the output of the first BOOST boost topology circuit.

[0010] The present invention is further configured such that: the second boost module includes a second boost circuit and a second PWM adjustment circuit connected in sequence; the second boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value; and the second PWM adjustment circuit is used to adjust the second PWM signal according to the output magnitude of the second boost circuit, thereby stabilizing the output of the second boost circuit.

[0011] The present invention is further configured such that: the switching circuit includes a unidirectional conduction circuit, wherein when the output of the first rectifier circuit is greater than or equal to a set voltage value, the mains power supply provides electrical energy, and when the output of the first rectifier circuit is less than the set voltage value, the energy storage power supply provides electrical energy.

[0012] The present invention is further configured to include a second rectifier circuit, the input of which is connected to the mains power supply, and its output is connected to the input of the switching power supply circuit after passing through a switching circuit, for providing power to the switching power supply circuit.

[0013] The present invention is further configured such that: the switching circuit includes at least three unidirectional conduction circuits, the positive terminal of the first unidirectional conduction circuit is connected to the positive output of the first boost module, and its negative terminal is connected to the positive input of the inverter circuit; the positive terminal of the second unidirectional conduction circuit is connected to the positive output of the second boost module, and its negative terminal is connected to the positive input of the switching power supply circuit; the positive terminal of the third unidirectional conduction circuit is connected to the positive output of the second rectifier circuit, and its negative terminal is connected to the positive input of the switching power supply circuit.

[0014] Secondly, the above-mentioned objective of this invention is achieved through the following technical solution: A welding machine control method with adaptive switching between grid power and energy storage power involves rectifying the grid power to obtain a rectified voltage, boosting the energy storage power to obtain a set voltage value, and switching the switching circuit when the rectified voltage is greater than or equal to the set voltage value so that the grid power provides power to the buck inverter module. When the rectified voltage is less than the set voltage value, the switching circuit switches the switching circuit again so that the energy storage power provides power to the buck inverter module.

[0015] The present invention is further configured to use a dual-boost circuit to boost the voltage of the energy storage power supply, which is used to provide power to the inverter circuit and the switching power supply circuit in the buck inverter module, respectively.

[0016] Compared with the prior art, the beneficial technical effects of this application are as follows: 1. This application achieves adaptive power supply switching by setting a switching circuit to automatically switch between the grid power supply and the energy storage power supply based on the voltage after rectification of the grid power supply and the set voltage value after boosting of the energy storage power supply. 2. Furthermore, this application incorporates a diode in the switching circuit, utilizing the characteristics of the diode to switch between high voltage and low voltage, eliminating the need for additional components and simplifying the circuit structure; 3. Furthermore, this application ensures priority connection to the mains power supply by setting a voltage value lower than the rectified voltage of the mains power supply. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the welding machine control circuit structure according to a specific embodiment of this application; Figure 2 This is a schematic diagram of the welding machine control circuit structure of another specific embodiment of this application; Figure 3 This is a schematic diagram of the first boost module structure, which is another specific embodiment of this application; Figure 4 This is a schematic diagram of the second boost module structure, which is another specific embodiment of this application. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. Specific Implementation Example 1 This application discloses a welding machine control circuit that adaptively switches between mains power and energy storage power, such as... Figure 1 As shown, it includes a buck inverter module, a boost module, and a switching module. The input of the buck inverter module is connected to the mains power supply, and it includes a first rectifier circuit BR1, an inverter circuit, a switching power supply circuit, a welding machine main control circuit, a buck circuit, and a secondary rectifier circuit.

[0020] The first rectifier circuit BR1, inverter circuit, step-down circuit, and secondary rectifier circuit are connected in sequence to convert the AC power from the mains power supply into DC power. After conversion, the DC power is converted into 65V high-frequency AC power for welding by the inverter circuit. Then, the DC power is stepped down by the transformer T1 of the step-down circuit. After rectification by the secondary rectifier circuit, a low-voltage, high-current welding power supply is output for the welding machine.

[0021] The switching power supply circuit and the welding machine main control circuit are connected in sequence to control the conduction frequency of the inverter circuit and the output power of the step-down inverter module.

[0022] The boost module and the switching module are connected in sequence. The input of the boost module is connected to the output of the energy storage power supply. One output of the switching module is connected to the input of the inverter circuit, and the other output is connected to the input of the switching power supply circuit.

[0023] The first rectifier circuit BR1 of the step-down inverter module is used to rectify the 220V AC power from the mains power supply to obtain 310V rectified DC power, which is output to the inverter circuit. The inverter circuit converts the 310V DC power into high-frequency AC power according to the control signal output by the welding machine main control circuit. The high-frequency frequency is controlled by the control signal frequency of the welding machine main control circuit. The high-frequency AC power is stepped down by transformer T1, and a low-voltage, high-current power supply is obtained in the secondary side to provide power to the welding machine.

[0024] The boost module is used to boost the low voltage of the energy storage power supply to a set voltage value. In the embodiments of this application, the set voltage value is 300V, which is lower than the voltage of 310V rectified DC power. This setting provides priority for grid power supply.

[0025] After passing through the switching circuit, the output of the boost module is connected to the input of the inverter circuit and the output of the first rectifier circuit to provide power to the inverter circuit. The second output is connected to the output of the switching power supply circuit to provide power to the switching power supply circuit.

[0026] Specifically, the first output is 300V DC, and the second output includes 300V DC and low-voltage DC for the operation of the switching power supply circuit and the welding machine main control circuit, such as 15V / 24V / -15V low-voltage DC.

[0027] The switching circuit includes a unidirectional conduction circuit. When the voltage of the rectified DC power is greater than or equal to the set voltage value, the first unidirectional conduction circuit connected to the mains power supply terminal applies the mains power voltage to the inverter circuit and the switching power supply circuit, while the second unidirectional conduction circuit connected to the boost module does not conduct. When the voltage of the rectified DC power is less than the set voltage value, the second unidirectional conduction circuit connected to the boost module applies the set voltage output of the boost module to the inverter circuit and the switching power supply circuit, while the first unidirectional conduction circuit connected to the mains power supply terminal does not conduct. Specific Implementation Example 2 This application discloses a welding machine control circuit that adaptively switches between mains power and energy storage power, such as... Figure 2 As shown, it includes a buck inverter module, a boost module, a switching module, and a second rectifier circuit BR2. The boost module includes a first boost module and a second boost module. The inputs of the first boost module and the second boost module are simultaneously connected to the output terminal of the energy storage power supply. The output of the first boost module is connected to the input terminal of the inverter circuit after passing through the switching circuit. The output of the second boost module is connected to the input terminal of the switching power supply circuit after passing through the switching circuit.

[0029] The first boost module is used to provide high-power DC power at the set voltage value to the inverter circuit. The second boost module is used to provide low-power DC power at the set voltage value and low-voltage DC power to the switching power supply circuit. The low-voltage DC power is used to provide power to the switching power supply circuit and the welding machine main control circuit.

[0030] In this embodiment, the energy storage power source is a battery pack that provides 48V low-voltage DC power.

[0031] The input of the second rectifier circuit is connected to the mains power supply, and its output is connected to the switching circuit.

[0032] The switching circuit determines the power supply for the welding machine based on the magnitude of the rectified DC voltage and the set voltage value. When the rectified DC voltage is greater than or equal to the set voltage value, the welding machine is powered by the mains power supply; when the rectified DC voltage is less than the set voltage value, the welding machine is powered by the energy storage power supply.

[0033] The output of the second rectifier circuit is connected to the switching power supply circuit through the third unidirectional conduction circuit of the switching circuit. Similarly, when the voltage of the rectified DC power is greater than or equal to the set voltage value, the mains power supply provides power to the switching power supply circuit. When the voltage of the rectified DC power is less than the set voltage value, the energy storage power supply provides power to the switching power supply circuit.

[0034] When the AC input of the mains power supply is 220V, the output of the first rectifier circuit and the second rectifier circuit is 310V rectified DC power. When the AC input of the mains power supply is less than 212V, the output of the first rectifier circuit and the second rectifier circuit is less than 300V. When the mains power supply voltage is abnormal, the energy storage power supply works to ensure the power of the welding machine. Specific Implementation Example 3 The first boost module in a welding machine control circuit that adaptively switches between mains power and energy storage power, as described in this application, is... Figure 3 As shown, it includes a first boost circuit and a first PWM adjustment circuit connected in sequence. The first boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value. The first PWM adjustment circuit is used to adjust the first PWM signal according to the output of the first boost circuit to stabilize the output of the first boost circuit.

[0036] The first boost circuit includes a first BOOST boost topology circuit, and the first PWM adjustment circuit includes a first voltage sampling circuit and a first PWM adjustment chip connected in sequence. The first voltage sampling circuit samples the output of the first BOOST boost topology circuit, and the first PWM adjustment chip adjusts the output of the first PWM signal according to the magnitude of the first sampled voltage, thereby controlling the output of the first BOOST boost topology circuit.

[0037] The first BOOST boost topology circuit includes a second energy storage inductor L2, a third switching transistor Q3, a thirtieth fast recovery diode D30, and a thirty-first fast recovery diode D31. Based on voltage and current parameters, two recovery diodes are used to ensure that the recovery diodes can operate within the set power range.

[0038] One end of the second energy storage inductor L2 is connected to the positive output terminal of the energy storage power supply, and the other end is connected to the input terminal of the third switching transistor Q3, the positive terminal of the thirtieth fast recovery diode D30, and the positive terminal of the thirty-first fast recovery diode D31.

[0039] The output of the third switch Q3 is connected to ground, and its control terminal is connected to the output of the first drive circuit.

[0040] The negative output terminal of the energy storage power supply is connected to one end of the current sensing resistor RS1, and the other end of the current sensing resistor RS1 is connected to the ground terminal.

[0041] The first driving circuit includes a fourth transistor Q4, a twenty-third diode D23, and a first current-limiting resistor R24. The fourth transistor Q4 is a PNP transistor, and its control terminal is connected to the first PWM signal output terminal of the first PWM adjustment chip through the first current-limiting resistor R24. Its output terminal, i.e., its emitter, is connected to the control terminal of the third switching transistor Q3, and its collector is grounded to VSS. Simultaneously, the control terminal of the fourth transistor Q4 is connected to the positive terminal of the twenty-third diode D23, and its output terminal is connected to the negative terminal of the twenty-third diode D23.

[0042] The first driving circuit is used to amplify the first PWM signal output by the first PWM adjustment chip to drive the third switching transistor Q3.

[0043] A first absorption circuit is set between the input and output terminals of the third switch Q3.

[0044] The first absorption circuit includes a 23rd capacitor C23, a 22nd resistor R22, and a 23rd resistor R23. The 22nd resistor R22 and the 23rd resistor R23 are connected in parallel and then connected in series with the 23rd capacitor C23 to form the first absorption circuit, which is used to protect the turn-off voltage between the input and output terminals of the third switch Q3 from exceeding the device's rated value.

[0045] The first voltage sampling circuit includes a resistor divider circuit. Series resistors R28 / R29 / R30 / R31 form a first sampling resistor string, and parallel resistors R32 / R33 form a second sampling resistor string. The output of the first BOOST boost topology circuit is divided by the first and second sampling resistor strings and then input to the voltage sampling terminal of the first PWM adjustment chip. The first PWM adjustment chip controls the frequency of the first PWM signal according to the magnitude of the sampled voltage.

[0046] The first PWM adjustment chip includes a current sampling terminal and a voltage sampling terminal, which are used to adjust the output voltage according to the current and voltage of the first boost circuit.

[0047] The first boost module also includes a first filter circuit, which includes resistors R21 / R25 and capacitors C21 / C22 / C25 / C26. Resistors R21 and capacitors C21 / C22 are connected in parallel, and resistors R25 and capacitors C25 / C26 are connected in parallel. The two parallel circuits are then connected in series to filter the output of the first BOOST boost topology circuit.

[0048] The DC ground VSS of the first boost module and the DC ground GND of the second boost module are different ground terminals.

[0049] The positive terminal of the thirty-second diode is connected to the output terminal of the first BOOST boost topology circuit, and its negative terminal is connected to the positive input terminal of the inverter circuit, serving as the first unidirectional conduction circuit for switching the output of the first boost module. Specific Implementation Example 4 This application discloses a second boost module for a welding machine control circuit that adaptively switches between mains power and energy storage power, such as... Figure 4 As shown, the second boost module includes a second boost circuit and a second PWM adjustment circuit connected in sequence. The second boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value, and the second PWM adjustment circuit is used to adjust the second PWM signal according to the output of the second boost circuit to stabilize the output of the second boost circuit.

[0051] The second boost circuit includes a second BOOST boost topology circuit, and the second PWM adjustment circuit includes a second voltage sampling circuit and a second PWM adjustment chip connected in sequence. The second voltage sampling circuit samples the output of the second BOOST boost topology circuit, and the second PWM adjustment chip adjusts the output of the second PWM signal according to the magnitude of the second sampled voltage, thereby controlling the output of the second BOOST boost topology circuit.

[0052] The second BOOST boost topology circuit includes a first energy storage inductor L1, a first switching transistor Q1, and a third fast recovery diode D3.

[0053] One end of the first energy storage inductor L1 is connected to the positive output terminal of the energy storage power supply, and the other end is connected to the input terminal of the first switching transistor Q1 and the positive terminal of the third fast recovery diode D3.

[0054] The output terminal of the first switching transistor Q1 is connected to one end of the seventeenth resistor R17 and one end of the sixteenth resistor R16; its control terminal is connected to one end of the sixth resistor R6, one end of the ninth resistor R9, and the negative terminal of the Zener diode ZD1; the positive terminal of the Zener diode ZD1 and the other end of the ninth resistor R9 are grounded.

[0055] The other end of the sixth resistor R6 is connected to the PWM signal output terminal of the second PWM adjustment chip and the negative terminal of the fourth diode D4. The positive terminal of the fourth diode D4 is grounded to GND.

[0056] The PWM signal output terminal of the second PWM adjustment chip is connected to the control terminal of the first switching transistor Q1 after passing through the current limiting resistor R6, thereby controlling the conduction frequency of the first switching transistor Q1.

[0057] A second absorption circuit is provided between the input and output terminals of the first switching transistor Q1. The second absorption circuit includes a seventh resistor / sixth capacitor connected in series, which is used to protect the turn-off voltage between the input and output terminals of the first switching transistor Q1 from exceeding the device's rated value.

[0058] The other end of the sixteenth resistor is connected to the current sampling terminal of the second PWM adjustment chip, which is used to sample the output current of the second boost circuit.

[0059] The second voltage sampling circuit includes a resistor divider circuit. Series resistors R4 / R3 / R19 form a second sampling resistor string, which, together with the fifth resistor R5, samples the output voltage of the second BOOST boost topology circuit. The output of the second BOOST boost topology circuit is divided by the second sampling resistor string and the fifth resistor R5 and then input to the voltage sampling terminal of the second PWM adjustment chip. The second PWM adjustment chip controls the frequency of the second PWM signal according to the magnitude of the sampled voltage.

[0060] The second PWM adjustment chip includes a current sampling terminal and a voltage sampling terminal, which are used to adjust the output voltage according to the current and voltage of the second boost circuit.

[0061] The second boost module also includes a second filter circuit, including capacitors C1 / C2 connected in parallel, for filtering the output of the second BOOST boost topology circuit.

[0062] The positive terminal of the second diode is connected to the output terminal of the second BOOST boost topology circuit, and its negative terminal is connected to the positive input terminal of the switching power supply circuit. As a second unidirectional conduction circuit, it is used to switch the output of the second boost module.

[0063] The second rectifier circuit BR2 has its input connected to the mains power supply and its output connected to the positive terminal of the first diode D1. The negative terminal of the first diode D1 is connected to the input of the switching power supply circuit. The first diode D1 acts as the third unidirectional conduction circuit to provide power to the switching power supply circuit.

[0064] exist Figure 4 In addition, the energy storage power supply also uses a conversion circuit to output low-voltage DC power, converting the voltage of the energy storage power supply into the working voltage of the switching power supply circuit and the welding machine main control circuit, so as to provide power to the switching power supply circuit and the welding machine main control circuit.

[0065] Low-voltage DC power supplies include 15V, 24V, and -15V power supplies.

[0066] The 15V voltage conversion circuit includes a second switching transistor Q2. One end of the fourteenth resistor R14 is connected to the positive terminal of the energy storage power supply, and the other end is connected to the negative terminal of the second Zener diode ZD2. The positive terminal of the second Zener diode ZD2 is grounded to GND, and the negative terminal of the second Zener diode ZD2 is used to provide control voltage to the second switching transistor Q2.

[0067] The tenth resistor R10 and the eleventh resistor R11 are connected in series, and the twelfth resistor R12 and the thirteenth resistor R13 are connected in series. The series structure of the tenth resistor R10 and the eleventh resistor R11 and the series structure of the twelfth resistor R12 and the thirteenth resistor R13 are connected in parallel and then connected between the input terminal of the second switch Q2 and the positive terminal of the energy storage power supply to provide current to the second switch Q2.

[0068] The output terminal of the second switching transistor Q2 is connected to the positive terminal of the fifth diode D5. The negative terminal of the fifth diode D5 serves as the output terminal of 15V DC, and is connected to one end of the filter capacitor C8 and one end of the filter capacitor C9. The other ends of the filter capacitors C8 and C9 are grounded to GND for filtering the 15V DC output.

[0069] This application discloses a welding machine control method with adaptive switching between grid power and energy storage power. The grid power is rectified to obtain a rectified voltage; the energy storage power is boosted to obtain an output voltage equal to a set voltage value. When the rectified voltage is greater than or equal to the set voltage value, a switching circuit is activated, blocking the boost output of the energy storage power and enabling the rectified output of the grid power. The rectified output of the grid power is applied to the input terminals of the inverter circuit and the switching power supply circuit, providing power to the buck inverter module. When the rectified voltage is less than the set voltage value, the switching circuit is activated again, enabling the boost output of the energy storage power and blocking the rectified output of the grid power. The boost output of the energy storage power is applied to the input terminals of the inverter circuit and the switching power supply circuit, providing power to the buck inverter module.

[0070] In another specific control method of this application, a dual-boost circuit is used to boost the voltage of the energy storage power supply, which is then used to provide power to the inverter circuit and the switching power supply circuit in the buck inverter module. When the rectified voltage is lower than a set voltage value, the switching circuit switches, and the first boost output and the second boost output of the energy storage power supply are turned on, while the rectified output of the grid power supply is blocked. The first boost output of the energy storage power supply is applied to the input terminal of the inverter circuit, and the second boost output is applied to the input terminal of the switching power supply circuit, so that the energy storage power supply provides power to the buck inverter module.

[0071] Set the voltage value to be lower than the rectified DC voltage after AC rectification of 220V, so as to ensure that the mains power is used first when it is available.

[0072] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding machine control circuit with adaptive switching between grid power and energy storage power, comprising a step-down inverter module for converting AC power into high-frequency AC power and then into low-voltage DC power output, including a first rectifier circuit, an inverter circuit, and a switching power supply circuit, wherein the input of the first rectifier circuit is connected to the grid power supply, and its output is connected to the input of the inverter circuit, characterized in that: It includes a boost module and a switching circuit connected in sequence. The input of the boost module is connected to the energy storage power supply and is used to boost the low voltage of the energy storage power supply to a set voltage value. The output of the switching circuit is connected to the input of the inverter circuit and the input of the switching power supply circuit respectively. The switching circuit adaptively switches between the grid power supply and the energy storage power supply according to the output of the first rectifier circuit and the set voltage value. The boost module includes a first boost module and a second boost module. The inputs of the first boost module and the second boost module are connected to an energy storage power source. The output of the first boost module is connected to the input of an inverter circuit after passing through a switching circuit. The switching circuit is used to provide power to the inverter circuit from the energy storage power source when the grid power supply is insufficient. The output of the second boost module is connected to the input of a switching power supply circuit after passing through a switching circuit. It is used to provide power to the switching power supply circuit from the energy storage power source when the grid power supply is insufficient. The first boost module includes a first boost circuit and a first PWM adjustment circuit connected in sequence. The first boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value. The first PWM adjustment circuit is used to adjust the first PWM signal according to the output of the first boost circuit to stabilize the output of the first boost circuit. The first boost circuit includes a first BOOST boost topology circuit, and the first PWM adjustment circuit includes a first voltage sampling circuit and a first PWM adjustment chip connected in sequence. The first voltage sampling circuit samples the output of the first BOOST boost topology circuit, and the first PWM adjustment chip adjusts the output of the first PWM signal according to the magnitude of the first sampled voltage, thereby controlling the output of the first BOOST boost topology circuit.

2. The welding machine control circuit with adaptive switching between grid power and energy storage power as described in claim 1, characterized in that: The second boost module includes a second boost circuit and a second PWM adjustment circuit connected in sequence. The second boost circuit is used to boost the voltage of the energy storage power supply to a set voltage value. The second PWM adjustment circuit is used to adjust the second PWM signal according to the output of the second boost circuit to stabilize the output of the second boost circuit.

3. The welding machine control circuit with adaptive switching between grid power and energy storage power as described in claim 1, characterized in that: The switching circuit includes a unidirectional conduction circuit. When the output of the first rectifier circuit is greater than or equal to the set voltage value, the mains power supply provides electrical energy. When the output of the first rectifier circuit is less than the set voltage value, the energy storage power supply provides electrical energy.

4. The welding machine control circuit with adaptive switching between grid power and energy storage power as described in claim 1, characterized in that: It also includes a second rectifier circuit. The input of the second rectifier circuit is connected to the mains power supply, and its output is connected to the input of the switching power supply circuit after passing through a switching circuit, so as to provide power to the switching power supply circuit.

5. The welding machine control circuit with adaptive switching between grid power and energy storage power according to claim 4, characterized in that: The switching circuit includes at least three unidirectional conduction circuits. The positive terminal of the first unidirectional conduction circuit is connected to the positive output of the first boost module, and its negative terminal is connected to the positive input of the inverter circuit. The positive terminal of the second unidirectional conduction circuit is connected to the positive output of the second boost module, and its negative terminal is connected to the positive input of the switching power supply circuit. The positive terminal of the third unidirectional conduction circuit is connected to the positive output of the second rectifier circuit, and its negative terminal is connected to the positive input of the switching power supply circuit.

6. A welding machine control method with adaptive switching between grid power and energy storage power, based on the welding machine control circuit with adaptive switching between grid power and energy storage power as described in claim 1, characterized in that: The grid power supply is rectified to obtain a rectified voltage, and the energy storage power supply is boosted to obtain a set voltage value. When the rectified voltage is greater than or equal to the set voltage value, the switching circuit switches to supply power to the buck inverter module from the grid power supply. When the rectified voltage is less than the set voltage value, the switching circuit switches to supply power to the buck inverter module from the energy storage power supply.

7. The welding machine control method for adaptive switching between grid power and energy storage power according to claim 6, characterized in that: A dual-boost circuit is used to boost the voltage of the energy storage power supply, which is then used to provide power to the inverter circuit and the switching power supply circuit in the buck inverter module.

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