Welding gun using lithium battery pack as power supply

Abstract

A welding gun using a lithium battery pack as a power source is characterized in that the output end of an output control circuit is connected with a nixie tube display circuit, the output end of the output control circuit is further connected with a function modulation circuit, and a first voltage stabilizing module reduces the voltage of a lithium battery power source to the working voltage of a working modulation module and outputs the working voltage to the working modulation module; the second voltage stabilizing module reduces the voltage of the lithium battery power supply to the working voltage of the driving circuit module and outputs the working voltage to the driving circuit module, the working modulation module outputs an alternating pulse width signal to the driving circuit module, and the driving circuit module amplifies the alternating pulse width signal to drive the alternating switch circuit. The alternating switch circuit generates alternating current and outputs working current through the output transformer, and the heating load is connected with the output end of the output transformer. The output control circuit is connected with the nixie tube display circuit, so that the electric quantity and the working time can be displayed, and real-time information is provided for users. And meanwhile, a lithium battery power supply is adopted, so that greater convenience and flexibility are provided.

Description

Technical Field

[0001] The utility model relates to the field of plastic repair, in particular to a welding gun which uses a lithium battery pack as a power source. Background Art

[0002] The number of cars in the current automobile industry is constantly increasing, and damage to plastic bumpers has become one of the most common accidents. However, existing plastic bumper repair equipment has a series of problems. First, most of the equipment needs to be connected to an AC power source, which limits its use in special occasions where there is no power access, such as field maintenance or emergency repairs.

[0003] Secondly, the existing repair welding guns are not intelligent enough and lack relevant parameter display functions, making it difficult for users to accurately understand the welding status and reducing work efficiency. In addition, most of the equipment is bulky and not easy to carry, which limits its use in different repair scenarios. Therefore, the current market needs a portable, intelligent, and multifunctional plastic bumper repair tool to solve the above problems and improve the flexibility and efficiency of repair. Summary of the invention

[0004] In order to solve the above problems, the utility model provides a welding gun using a lithium battery pack as a power source. The output control circuit can display the power and working time by connecting to the digital tube display circuit to provide real-time information for the user. Through the regulation of the function modulation circuit, the welding gun can achieve precise output power control during work to adapt to different welding requirements. At the same time, the use of lithium battery power source provides greater convenience and flexibility for users who need to perform welding operations in different positions.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a welding gun using a lithium battery pack as a power source, including an output control circuit, a digital tube display circuit, a lithium battery power source, a function modulation circuit, a function drive circuit, an output transformer, and a heating load, wherein the output end of the output control circuit is connected to the digital tube display circuit, and the output end of the output control circuit is also connected to the function modulation circuit, wherein the function modulation circuit includes a first voltage stabilizing module and a working modulation module, the lithium battery power source is connected to the first voltage stabilizing module, the first voltage stabilizing module steps down the lithium battery power source voltage to the working voltage of the working modulation module and outputs it to the working modulation module; the function drive circuit includes a second voltage stabilizing module, a drive circuit module, and an alternating switching circuit, the second voltage stabilizing module steps down the lithium battery power source voltage to the working voltage of the drive circuit module and outputs it to the drive circuit module, wherein the working modulation module outputs an alternating pulse width signal to the drive circuit module, the drive circuit module amplifies the alternating pulse width signal and then drives the alternating switching circuit, the alternating switching circuit generates an alternating current and outputs the working current through the output transformer, and the heating load is connected to the output end of the output transformer.

[0006] As a further optimization scheme, the output control circuit includes a main control microcontroller U5 and a second interface CON2, wherein the functional modulation circuit also includes a first interface CON1, the main control microcontroller U5 is connected to the first interface CON1 through the second interface CON2, and the first interface CON1 is respectively connected to the first voltage stabilizing module and the working modulation module; pins 1 to 11 of the main control microcontroller U5 are connected to the digital tube display circuit.

[0007] As a further optimization scheme, the output control circuit also includes a switch KEY1 and a switch KEY3, wherein one end of the switch KEY1 is grounded and the other end is connected to pin 16 of the main control microcontroller U5, wherein one end of the switch KEY3 is grounded and the other end is connected to pin 15 of the main control microcontroller U5.

[0008] As a further optimization scheme, the first voltage stabilizing module includes a voltage stabilizing LDO chip U2, a resistor R11, a capacitor C7, a capacitor C8, and a capacitor C9, and the working modulation module includes a working modulation chip U3; wherein the positive electrode of the lithium battery power supply is connected to the Vin end of the voltage stabilizing LDO chip U2 through the resistor R11, wherein the Vin end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C7, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C9, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C8, wherein the GND end of the voltage stabilizing LDO chip U2 is connected to pin No. 4 of the working modulation chip U3, and the Vout end of the voltage stabilizing LDO chip U2 is connected to pin No. 2 of the working modulation chip U3.

[0009] As a further optimization scheme, the functional modulation circuit also includes a temperature control protection module, wherein the temperature control protection module includes a resistor R14, a resistor R13, a capacitor C5, and a thermistor NTC, wherein pin 2 of the first interface CON1 is connected to one end of the thermistor NTC through the resistor R14, and the other end of the thermistor NTC is grounded; pin 4 of the first interface CON1 is connected to pin 1 of the working modulation chip U3 through the resistor R13, and pin 6 of the first interface CON1 is grounded through the thermistor NTC; capacitor C5 is connected in parallel at both ends of the resistor R14, and pin 2 of the first interface CON1 is connected to pin 2 of the working modulation chip U3.

[0010] As a further optimization scheme, the function modulation circuit also includes an indicator light circuit, which includes a resistor R9, a light-emitting diode LED1, a transistor Q3, and a resistor R10, wherein one end of the resistor R9 is connected to the positive electrode of the lithium battery power supply, the other end of the resistor R9 is connected to the positive electrode of the light-emitting diode LED1, the negative electrode of the light-emitting diode LED1 is connected to the collector of the transistor Q3, pin No. 5 of the first interface CON1 is connected to the base of the transistor Q3 through the resistor R10, and the emitter of the transistor Q3 is grounded.

[0011] As a further optimization scheme, the functional modulation circuit also includes a voltage-dividing resistor R20 and a voltage-dividing resistor R19. One end of the voltage-dividing resistor R20 is connected to the positive pole of the lithium battery power supply, and the other end of the voltage-dividing resistor R20 is connected to pin 3 of the first interface CON1. ​​The other end of the voltage-dividing resistor R20 is also connected to pin 4 of the working modulation chip U3 through the voltage-dividing resistor R19.

[0012] As a further optimization scheme, the second voltage stabilizing module includes a voltage stabilizing LDO chip QZ1, a resistor R12, a capacitor C10, a capacitor C12, and a capacitor C11, and the driving module includes a driving chip U1; wherein the positive electrode of the lithium battery power supply is connected to the Vin end of the voltage stabilizing LDO chip QZ1 through the resistor R11, the Vin end of the voltage stabilizing LDO chip QZ1 is connected to the GND end of the voltage stabilizing LDO chip QZ1 through the capacitor C10, and the GND end of the voltage stabilizing LDO chip QZ1 is grounded through the capacitor C11, the GND end of the voltage stabilizing LDO chip QZ1 is grounded through the capacitor C12, and the Vout end of the voltage stabilizing LDO chip QZ1 is grounded.

[0013] As a further optimization scheme, the driving module also includes resistors R15, R16, R17, and R18. Pin 4 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R15, pin 4 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R18, pin 8 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R16, and pin 7 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R17.

[0014] As a further optimization scheme, the alternating switch circuit includes a diode D2, a resistor R22, a MOS tube Q2, a resistor R23, a capacitor C13, a diode D1, a resistor R21, a MOS tube Q1, a resistor R24, and a capacitor C14; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R21, one end of the No. 7 pin of the driver chip U1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the G pole of the MOS tube Q1; the D pole of the MOS tube Q1 is connected to the G pole of the MOS tube Q1 through the resistor R24, the resistor R23, and the capacitor C14; ... G pole of the MOS tube Q1 through the resistor R24, the resistor R23, and the capacitor C14; the No. 7 pin of the driver chip U1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the G pole of the MOS tube Q1; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R24, the resistor R23, and the capacitor C14; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R24, the resistor R23, and the capacitor C14; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R24, the resistor R23, and the Capacitor C14 is connected to the positive electrode of the lithium battery power source, and the S electrode of the MOS tube Q1 is grounded; pin 6 of the driving chip U1 is connected to the G electrode of the MOS tube Q2 through the resistor R22, one end of pin 6 of the driving chip U1 is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the G electrode of the MOS tube Q2; the D electrode of the MOS tube Q1 is connected to the positive electrode of the lithium battery power source through the resistor R23 and the capacitor C13, and the S electrode of the MOS tube Q2 is grounded; and the D electrode of the MOS tube Q2 is also connected to the G electrode of the MOS tube Q1.

[0015] As a further optimization scheme, the lithium battery power supply includes a lithium battery, a power interface, and a switch KEY, wherein the positive and negative poles of the lithium battery are respectively connected to the positive and negative poles of the power interface, and the positive pole of the power interface is connected to the switch KEY, and the switch KEY is connected to the resistor R9 through the fuse FU.

[0016] The beneficial effect of the utility model is that the output control circuit can display the power and working time by connecting to the digital tube display circuit, providing real-time information for the user. Through the regulation of the functional modulation circuit, the welding gun can achieve precise output power control during work and adapt to different welding requirements. At the same time, the connection between the output control circuit and the functional modulation circuit realizes flexible adjustment of the welding output. The functional modulation circuit is responsible for stabilizing the voltage of the lithium battery to 5V suitable for the working modulation chip U3, and the working modulation chip U3 generates an alternating pulse width signal of 2KHZ-7KHZ, providing a precise working frequency for the welding gun. This signal is amplified by the functional drive circuit, and an alternating current is generated by the alternating switch circuit, which is finally transmitted to the heating load by the output transformer to realize the welding operation.

[0017] Overall, this welding gun design ensures stable power supply, flexible power regulation, real-time power and working time display, and effective protection of welding temperature during the welding process through multiple circuit modules working together. This not only improves the efficiency of welding work, but also increases the user-friendliness of the welding gun through the design of the touch buttons KEY1 and KEY3, making welding operations safer and more convenient.

[0018] The design scheme of using lithium battery pack as power source has obvious advantages in portability. Compared with traditional power sources, such as plug-in power cords, lithium battery packs are lighter and more flexible, so that the welding gun is not restricted by power sockets when in use, and it is convenient to move flexibly in various working places. This provides greater convenience and flexibility for users who need to perform welding operations in different locations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of a specific circuit structure of a welding gun using a lithium battery pack as a power source. DETAILED DESCRIPTION

[0020] See also Figure 1 As shown, the utility model relates to a welding gun using a lithium battery pack as a power source, including an output control circuit, a digital tube display circuit, a lithium battery power source, a function modulation circuit, a function drive circuit, an output transformer, and a heating load, wherein the output end of the output control circuit is connected to the digital tube display circuit, wherein the output control circuit drives the digital tube display circuit to display the power value and the working time and detect the working state; the output control circuit is also connected to the function modulation circuit, wherein the function modulation circuit includes a first voltage stabilizing module and a working modulation module, the lithium battery power source is connected to the first voltage stabilizing module, and the first voltage stabilizing module reduces the voltage of the lithium battery power source to the working modulation module The working voltage is 5V and is output to the working modulation module. The working modulation chip U3 outputs an alternating pulse width signal of 2KHZ-7KHZ. The functional driving circuit includes a second voltage stabilizing module, a driving circuit module, and an alternating switching circuit. The second voltage stabilizing module steps down the lithium battery power supply voltage to the working voltage of the driving circuit module of 12V and outputs it to the driving circuit module. The working modulation module outputs an alternating pulse width signal to the driving circuit module. The driving circuit module amplifies the alternating pulse width signal and then drives the alternating switching circuit. The alternating switching circuit generates an alternating current and outputs a working current through an output transformer. The heating load is connected to the output end of the output transformer.

[0021] This design describes a welding gun that uses a lithium battery pack as a power source, covering multiple circuit modules such as output control, digital tube display, battery power supply, function modulation, function drive, output transformer and heating load. Its core function is to provide users with an efficient and controllable welding solution.

[0022] The output control circuit is a key part of the welding gun. By connecting to the digital tube display circuit, it can display the power and working time, providing real-time information for users. Through the regulation of the functional modulation circuit, the welding gun can achieve precise output power control during work to adapt to different welding needs. At the same time, the connection between the output control circuit and the functional modulation circuit realizes flexible adjustment of the welding output. The functional modulation circuit is responsible for stabilizing the voltage of the lithium battery to 5V suitable for the working modulation chip U3, while the working modulation chip U3 generates an alternating pulse width signal of 2KHZ-7KHZ, providing a precise working frequency for the welding gun. This signal is amplified by the functional drive circuit, and an alternating current is generated through the alternating switch circuit, which is finally transmitted to the heating load by the output transformer to realize the welding operation.

[0023] Overall, this welding gun design ensures stable power supply, flexible power regulation, real-time power and working time display, and effective protection of welding temperature during the welding process through multiple circuit modules working together. This not only improves the efficiency of welding work, but also increases the user-friendliness of the welding gun through the design of the touch buttons KEY1 and KEY3, making welding operations safer and more convenient.

[0024] Specifically, the output control circuit includes a main control microcontroller U5 and a second interface CON2, wherein the functional modulation circuit also includes a first interface CON1, the main control microcontroller U5 is connected to the first interface CON1 through the second interface CON2, and the first interface CON1 is respectively connected to the first voltage stabilizing module and the working modulation module.

[0025] Specifically, the output control circuit also includes a switch KEY1 and a switch KEY3, wherein one end of the switch KEY1 is grounded and the other end is connected to pin 16 of the main control microcontroller U5, wherein one end of the switch KEY3 is grounded and the other end is connected to pin 15 of the main control microcontroller U5.

[0026] Specifically, the first voltage stabilizing module includes a voltage stabilizing LDO chip U2, a resistor R11, a capacitor C7, a capacitor C8, and a capacitor C9, and the working modulation module includes a working modulation chip U3; wherein the positive electrode of the lithium battery power supply is connected to the Vin end of the voltage stabilizing LDO chip U2 through the resistor R11, wherein the Vin end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C7, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C9, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C8, wherein the GND end of the voltage stabilizing LDO chip U2 is connected to pin No. 4 of the working modulation chip U3, and the Vout end of the voltage stabilizing LDO chip U2 is connected to pin No. 2 of the working modulation chip U3.

[0027] The voltage regulator LDO chip U2 is used to stabilize the voltage of the lithium battery power supply and step it down to the working voltage required by the working modulation module. Resistor R11 plays the role of current limitation. Capacitors C7, C8, and C9 are used to stabilize the voltage, eliminate voltage fluctuations, and provide transient response.

[0028] The current passes through resistor R11 and is limited to ensure that it is within the controllable range. The current after current limiting flows into the Vin terminal of the voltage-stabilized LDO chip U2. The voltage-stabilized LDO chip U2 monitors the voltage of Vin and adjusts the current to maintain the set output voltage through the internal control circuit. At the same time, capacitors C7 and C9 are used to smooth the voltage and provide transient response and stability of the current. C8 connects Vout and GND, and C7 and C9 connect Vin and GND to ensure a stable voltage.

[0029] Specifically, the functional modulation circuit also includes a temperature control protection module, wherein the temperature control protection module includes a resistor R14, a resistor R13, a capacitor C5, and a thermistor NTC, wherein pin 2 of the first interface CON1 is connected to one end of the thermistor NTC through the resistor R14, and the other end of the thermistor NTC is grounded; pin 4 of the first interface CON1 is connected to pin 1 of the working modulation chip U3 through the resistor R13, and pin 6 of the first interface CON1 is grounded through the thermistor NTC; capacitor C5 is connected in parallel at both ends of the resistor R14, and pin 2 of the first interface CON1 is connected to pin 2 of the working modulation chip U3.

[0030] The temperature-sensitive resistor NTC is connected to the resistor R14 through the pin 2 of the first interface CON1 to form a temperature sensing network. The signal of this network is connected to the pin 1 of the working modulation chip U3 through the pin 4 of the first interface CON1 and the resistor R13. Similarly, the pin 6 of the first interface CON1 is grounded through the temperature-sensitive resistor NTC to ensure the consistency of the potential reference. In addition, the capacitor C5 is connected in parallel to both ends of the resistor R14 to smooth the signal of the temperature-sensitive resistor NTC.

[0031] The signal processing network of the entire temperature control protection module is transmitted to the main control microcontroller U5 through the second interface CON2. Specifically, pin 2 of CON1 is connected to pin 2 of the working modulation chip U3 to transmit the temperature information to U3. The main control microcontroller U5 is connected to the first interface CON1 through the second interface CON2 to realize the collection and monitoring of temperature signals. In this way, U5 can make corresponding control decisions according to the changes in the internal temperature of the welding gun to realize the temperature protection function. The entire design is designed to ensure that the welding gun always maintains a safe temperature level when working.

[0032] Specifically, the function modulation circuit also includes an indicator light circuit, which includes a resistor R9, a light-emitting diode LED1, a transistor Q3, and a resistor R10, wherein one end of the resistor R9 is connected to the positive electrode of the lithium battery power supply, the other end of the resistor R9 is connected to the positive electrode of the light-emitting diode LED1, the negative electrode of the light-emitting diode LED1 is connected to the collector of the transistor Q3, pin No. 5 of the first interface CON1 is connected to the base of the transistor Q3 through the resistor R10, and the emitter of the transistor Q3 is grounded.

[0033] The design of the indicator light circuit is used to provide a visual indication of the working status of the welding gun. The following is a specific principle analysis of the circuit: one end of the resistor R9 is connected to the positive electrode of the lithium battery power supply, and the other end is connected to the positive electrode of the light-emitting diode LED1. This part forms the current path of the LED, and limits the current of LED1 through R9 to ensure that LED1 emits normally. The cathode of the light-emitting diode LED1 is connected to the collector of the transistor Q3. The emitter of the transistor Q3 is grounded to ensure that the current can flow and realize the on and off control of LED1. Pin 5 of the first interface CON1 is connected to the base of the transistor Q3 through the resistor R10, which is used to control the conduction and cutoff of the transistor, thereby controlling the on and off state of LED1. When pin 5 of CON1 outputs a high level, the transistor Q3 is turned on through R10, and LED1 is lit; when the output is a low level, the transistor Q3 is turned off and LED1 is off. The indicator light circuit designed in this way can intuitively feedback the operation of the welding gun to the user through the on and off state of LED1 according to the working state of the welding gun. When the welding gun is in working state, LED1 lights up, indicating that welding work is in progress.

[0034] Specifically, the functional modulation circuit also includes a voltage-dividing resistor R20 and a voltage-dividing resistor R19. One end of the voltage-dividing resistor R20 is connected to the positive pole of the lithium battery power supply, and the other end of the voltage-dividing resistor R20 is connected to pin 3 of the first interface CON1. ​​The other end of the voltage-dividing resistor R20 is also connected to pin 4 of the working modulation chip U3 through the voltage-dividing resistor R19.

[0035] Since one end of resistor R20 is connected to the positive electrode of the lithium battery, the current flows through R20 and R19 to form a voltage divider network. According to the voltage divider principle, the voltage at the voltage divider point is proportional to the resistance value. By measuring the voltage at the connection point of R19 and R20, the voltage level of the lithium battery can be known. The voltage level of a lithium battery is usually related to the charge level, so by detecting the voltage at the voltage divider point of the resistor network, the charge status of the lithium battery can be indirectly understood. This voltage information can be transmitted to the main control microcontroller U5, which is used to display the charge status on the digital tube to let the user know the battery charge status. By monitoring the battery charge, the circuit can implement some protection mechanisms, such as stopping work when the battery charge is too low to prevent excessive discharge from damaging the battery. In general, resistors R19 and R20 play a key role in detecting the charge level of the lithium battery in the circuit, providing real-time monitoring and feedback functions of the charge status for the welding gun.

[0036] Specifically, the second voltage stabilizing module includes a voltage stabilizing LDO chip QZ1, a resistor R12, a capacitor C10, a capacitor C12, and a capacitor C11, and the driving module includes a driving chip U1; wherein the positive electrode of the lithium battery power supply is connected to the Vin end of the voltage stabilizing LDO chip QZ1 through the resistor R11, the Vin end of the voltage stabilizing LDO chip QZ1 is connected to the GND end of the voltage stabilizing LDO chip QZ1 through the capacitor C10, and the GND end of the voltage stabilizing LDO chip QZ1 is grounded through the capacitor C11, the GND end of the voltage stabilizing LDO chip QZ1 is grounded through the capacitor C12, and the Vout end of the voltage stabilizing LDO chip QZ1 is grounded.

[0037] This chip is a low drop-out regulator (LDO), which is used to stabilize the voltage of the lithium battery power supply to a lower operating voltage to supply the subsequent drive module.

[0038] The Vin terminal is connected to the positive pole of the lithium battery power supply, and the current is limited by the resistor R11, and the stable current flows into the LDO chip. The Vout terminal outputs a stable low voltage to supply the subsequent drive module. Resistor R12, capacitors C10, C11, C12: These resistors and capacitors are used for filtering and stabilizing the current of the voltage-stabilizing LDO chip. The role of capacitors C10 and C11: C10 and C11 are capacitors used to stabilize and filter power signals. They help reduce noise in the power supply and ensure that the chip obtains a stable operating voltage. The role of capacitor C12: C12 is also a capacitor used to stabilize the power supply signal and smoothly introduce current into the ground. In general, the role of the second voltage stabilization module is to stabilize the voltage from the lithium battery to an appropriate level to supply the subsequent drive modules, ensuring that these modules can work normally within the appropriate voltage range. At the same time, the capacitor element helps to provide power stability and filtering.

[0039] Specifically, the driving module also includes resistors R15, R16, R17, and R18. Pin 4 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R15, pin 4 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R18, pin 8 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R16, and pin 7 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R17. These resistors establish a connection between the working modulation chip U3 and the driving chip U1, ensuring correct signal transmission and matching, so that the output of the welding gun can be controlled and adjusted. This helps to achieve precise control and efficient operation of the welding gun.

[0040] Specifically, the alternating switch circuit includes a diode D2, a resistor R22, a MOS tube Q2, a resistor R23, a capacitor C13, a diode D1, a resistor R21, a MOS tube Q1, a resistor R24, and a capacitor C14; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R21, one end of the No. 7 pin of the driver chip U1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the G pole of the MOS tube Q1; the D pole of the MOS tube Q1 is connected to the G pole of the MOS tube Q1 through the resistor R24 ​​and the capacitor C1 4 is connected to the positive electrode of the lithium battery power source, and the S electrode of the MOS tube Q1 is grounded; the No. 6 pin of the driving chip U1 is connected to the G electrode of the MOS tube Q2 through the resistor R22, one end of the No. 6 pin of the driving chip U1 is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the G electrode of the MOS tube Q2; the D electrode of the MOS tube Q1 is connected to the positive electrode of the lithium battery power source through the resistor R23 and the capacitor C13, and the S electrode of the MOS tube Q2 is grounded; and the D electrode of the MOS tube Q2 is also connected to the G electrode of the MOS tube Q1.

[0041] These two MOS tubes act as the main switching elements in the alternating switching circuit. The conduction states of MOS tubes Q1 and Q2 are switched alternately, causing current to flow alternately between them, thereby generating an alternating current. The role of diodes D1 and D2: Diodes D1 and D2 are used to limit the reverse voltage of MOS tubes Q1 and Q2 to prevent damage to these components. The positive pole of D1 is connected to the D pole of MOS tube Q1, and the negative pole of D1 is connected to the G pole of MOS tube Q1. The positive pole of D2 is connected to the D pole of MOS tube Q2, and the negative pole of D2 is connected to the G pole of MOS tube Q2.

[0042] The role of resistors R21, R22, R23, and R24: These resistors limit the current and adjust the voltage in the circuit, thereby ensuring the stability of the circuit. R21 and R22 limit the current of pin 7 of the driver chip U1, and are connected to the G poles of MOS tubes Q1 and Q2. R23 and R24 are used to limit the current of MOS tubes Q1 and Q2. The role of capacitors C13 and C14: These capacitors are used to smooth and adjust the voltage fluctuations in the circuit to ensure the stability of the circuit. In general, this alternating switching circuit generates an alternating current by controlling the switching state of MOS tubes Q1 and Q2. This alternating current will pass through the output transformer and eventually be provided to the heating load of the welding gun to achieve the output work of the welding gun. This alternating switching design helps to achieve efficient energy conversion and control.

[0043] Specifically, the lithium battery power source includes a lithium battery, a power interface, and a switch KEY, wherein the positive and negative electrodes of the lithium battery are respectively connected to the positive and negative electrodes of the power interface, and the positive electrode of the power interface is connected to the switch KEY, and the switch KEY is connected to the resistor R9 through the fuse FU. The switch KEY is a power switch used to control the opening and closing of the circuit.

[0044] The positive pole of the switch KEY is connected to the positive pole of the power interface, which plays the role of controlling the circuit on and off. Fuse FU: Fuse FU is a component used to provide circuit protection. It is connected between the switch KEY and the resistor R9. The function of fuse FU is to cut off the circuit when the current is too large to prevent damage to the circuit components. This is a safety protection measure, especially when using high-energy power sources such as lithium batteries.

[0045] In this specific embodiment, the welding gun design scheme in which the output transformer adopts an amorphous nano-magnetic ring transformer has a series of technical advantages. Compared with traditional silicon steel sheet transformers, amorphous nano-magnetic ring transformers have the characteristics of high efficiency, light weight, and low loss, so their application in welding guns provides the possibility of improving overall performance. The characteristics of amorphous nano-magnetic ring materials make the transformer have a higher magnetic permeability and can transfer electric energy more effectively, thereby improving the energy conversion efficiency of the entire system. This means that under the same power output, the welding gun can use electric energy more efficiently and reduce energy waste. Amorphous nano-magnetic ring transformers are lighter and smaller in size than traditional transformers. For handheld devices such as welding guns, this means a more portable and lightweight design, making welding operations more flexible and suitable for different scenarios and working environments. In addition, due to the low loss characteristics of the amorphous nano-magnetic ring transformer, the overall welding gun generates less heat when working, which helps to reduce the temperature rise of the equipment and improve the stability and life of the equipment. Therefore, the welding gun design scheme using an amorphous nano-magnetic ring transformer brings a series of advantages in terms of energy efficiency, portability, and stability, providing a more reliable and convenient solution for welding operations.

[0046] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A welding gun using a lithium battery pack as a power source, characterized in that: It includes an output control circuit, a digital tube display circuit, a lithium battery power supply, a function modulation circuit, a function drive circuit, an output transformer, and a heating load, wherein the output end of the output control circuit is connected to the digital tube display circuit, and the output end of the output control circuit is also connected to the function modulation circuit, wherein the function modulation circuit includes a first voltage stabilizing module and a working modulation module, the lithium battery power supply is connected to the first voltage stabilizing module, the first voltage stabilizing module steps down the lithium battery power supply voltage to the working voltage of the working modulation module and outputs it to the working modulation module; the function drive circuit includes a second voltage stabilizing module, a drive circuit module, and an alternating switch circuit, the second voltage stabilizing module steps down the lithium battery power supply voltage to the working voltage of the drive circuit module and outputs it to the drive circuit module, wherein the working modulation module outputs an alternating pulse width signal to the drive circuit module, the drive circuit module amplifies the alternating pulse width signal and then drives the alternating switch circuit, the alternating switch circuit generates an alternating current and outputs the working current through the output transformer, and the heating load is connected to the output end of the output transformer.

2. A welding gun using a lithium battery pack as a power source according to claim 1, characterized in that: The output control circuit includes a main control microcontroller U5 and a second interface CON2, wherein the functional modulation circuit also includes a first interface CON1. ​​The main control microcontroller U5 is connected to the first interface CON1 through the second interface CON2, and the first interface CON1 is respectively connected to the first voltage stabilizing module and the working modulation module; pins 1 to 11 of the main control microcontroller U5 are connected to the digital tube display circuit.

3. A welding gun using a lithium battery pack as a power source according to claim 2, characterized in that: The output control circuit also includes a switch KEY1 and a switch KEY3, wherein one end of the switch KEY1 is grounded and the other end is connected to pin 16 of the main control microcontroller U5, wherein one end of the switch KEY3 is grounded and the other end is connected to pin 15 of the main control microcontroller U5.

4. A welding gun using a lithium battery pack as a power source according to claim 3, characterized in that: The first voltage stabilizing module includes a voltage stabilizing LDO chip U2, a resistor R11, a capacitor C7, a capacitor C8, and a capacitor C9, and the working modulation module includes a working modulation chip U3; wherein the positive electrode of the lithium battery power supply is connected to the Vin end of the voltage stabilizing LDO chip U2 through the resistor R11, wherein the Vin end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C7, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C9, and the Vout end of the voltage stabilizing LDO chip U2 is connected to the GND end of the voltage stabilizing LDO chip U2 through the capacitor C8, wherein the GND end of the voltage stabilizing LDO chip U2 is connected to pin No. 4 of the working modulation chip U3, and the Vout end of the voltage stabilizing LDO chip U2 is connected to pin No. 2 of the working modulation chip U3.

5. A welding gun using a lithium battery pack as a power source according to claim 3, characterized in that: The functional modulation circuit also includes a temperature control protection module, wherein the temperature control protection module includes a resistor R14, a resistor R13, a capacitor C5, and a thermistor NTC, wherein pin 2 of the first interface CON1 is connected to one end of the thermistor NTC through the resistor R14, and the other end of the thermistor NTC is grounded; pin 4 of the first interface CON1 is connected to pin 1 of the working modulation chip U3 through the resistor R13, and pin 6 of the first interface CON1 is grounded through the thermistor NTC; capacitor C5 is connected in parallel at both ends of the resistor R14, and pin 2 of the first interface CON1 is connected to pin 2 of the working modulation chip U3.

6. A welding gun using a lithium battery pack as a power source according to claim 5, characterized in that: The function modulation circuit also includes an indicator light circuit, which includes a resistor R9, a light-emitting diode LED1, a transistor Q3, and a resistor R10, wherein one end of the resistor R9 is connected to the positive electrode of the lithium battery power supply, the other end of the resistor R9 is connected to the positive electrode of the light-emitting diode LED1, the negative electrode of the light-emitting diode LED1 is connected to the collector of the transistor Q3, and pin No. 5 of the first interface CON1 is connected to the base of the transistor Q3 through the resistor R10, and the emitter of the transistor Q3 is grounded.

7. A welding gun using a lithium battery pack as a power source according to claim 6, characterized in that: The functional modulation circuit also includes a voltage-dividing resistor R20 and a voltage-dividing resistor R19. One end of the voltage-dividing resistor R20 is connected to the positive electrode of the lithium battery power supply, and the other end of the voltage-dividing resistor R20 is connected to pin 3 of the first interface CON1. ​​The other end of the voltage-dividing resistor R20 is also connected to pin 4 of the working modulation chip U3 through the voltage-dividing resistor R19.

8. A welding gun using a lithium battery pack as a power source according to claim 7, characterized in that: The second voltage stabilizing module includes a voltage stabilizing LDO chip QZ1, a resistor R12, a capacitor C10, a capacitor C12, and a capacitor C11, and the driving module includes a driving chip U1; The positive electrode of the lithium battery power supply is connected to the Vin end of the voltage-stabilizing LDO chip QZ1 through the resistor R11, the Vin end of the voltage-stabilizing LDO chip QZ1 is connected to the GND end of the voltage-stabilizing LDO chip QZ1 through the capacitor C10, and the GND end of the voltage-stabilizing LDO chip QZ1 is grounded through the capacitor C11, the GND end of the voltage-stabilizing LDO chip QZ1 is grounded through the capacitor C12, and the Vout end of the voltage-stabilizing LDO chip QZ1 is grounded.

9. A welding gun using a lithium battery pack as a power source according to claim 8, characterized in that: The driving module also includes resistors R15, R16, R17, and R18. Pin 4 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R15, pin 4 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R18, pin 8 of the working modulation chip U3 is connected to pin 2 of the driving chip U1 through resistor R16, and pin 7 of the working modulation chip U3 is connected to pin 3 of the driving chip U1 through resistor R17.

10. A welding gun using a lithium battery pack as a power source according to claim 9, characterized in that: The alternating switch circuit includes a diode D2, a resistor R22, a MOS tube Q2, a resistor R23, a capacitor C13, a diode D1, a resistor R21, a MOS tube Q1, a resistor R24, and a capacitor C14; the No. 7 pin of the driver chip U1 is connected to the G pole of the MOS tube Q1 through the resistor R21, one end of the No. 7 pin of the driver chip U1 is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the G pole of the MOS tube Q1; the D pole of the MOS tube Q1 is connected to the positive pole of the diode D1 through the resistor R24 ​​and the capacitor C14 The positive electrode of the lithium battery power source is connected, and the S electrode of the MOS tube Q1 is grounded; the No. 6 pin of the driving chip U1 is connected to the G electrode of the MOS tube Q2 through the resistor R22, one end of the No. 6 pin of the driving chip U1 is connected to the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the G electrode of the MOS tube Q2; the D electrode of the MOS tube Q1 is connected to the positive electrode of the lithium battery power source through the resistor R23 and the capacitor C13, and the S electrode of the MOS tube Q2 is grounded; and the D electrode of the MOS tube Q2 is also connected to the G electrode of the MOS tube Q1.

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