Thermocouple spot welding device

Abstract

The invention discloses a thermocouple spot welding device, and relates to the field of circuits, the thermocouple spot welding device comprises a power supply battery, a voltage conversion module, a voltage regulating module, a control module and an energy storage module, the voltage conversion module is used for converting a direct current power supply output by the power supply battery into a target voltage to charge the energy storage module; and the charged energy storage module can discharge by utilizing the stored electric energy, so that high-power welding current is generated. The power supply battery is directly arranged in the thermocouple spot welding device to realize power supply design, so that the thermocouple spot welding device can independently realize spot welding of the thermocouple, the portability of the whole thermocouple spot welding device is improved, and the application scene of the thermocouple spot welding device is expanded; and meanwhile, the energy storage module can be charged only by arranging the voltage conversion module in the thermocouple spot welding device for conversion of the direct-current power supply, the design is simplified, and therefore the size of the whole thermocouple spot welding device is reduced.

Description

Technical Field

[0001] This invention relates to the field of circuits, and in particular to a thermocouple spot welding device. Background Technology

[0002] Thermocouples are commonly used temperature-sensing elements in temperature measurement applications. They convert temperature signals into electromotive force signals, which are then converted into the temperature of the measured medium by electrical instruments. Thermocouples are simple in structure, easy to use, and have advantages such as stable performance and a wide temperature measurement range, making them the most frequently used contact temperature measurement device in industry. A thermocouple generally consists of two metal wires that need to be welded together to form a closed loop in the circuit. A thermocouple spot welding machine is a specialized device used to weld these two metal wires in a thermocouple.

[0003] Existing thermocouple spot welding machines require an external AC power supply to provide the high current and high power needed for welding. These machines also incorporate sequentially connected rectifier circuits, high-frequency inverter circuits, step-down circuits, and rectifier circuits to convert the input AC power into DC output. The output current for welding is obtained through this DC output. For example, a capacitor-type thermocouple spot welder uses this DC output to charge its internal capacitor, utilizing the discharge process of the stored energy to achieve the output current during welding. The numerous conversion circuits result in a large overall size and poor portability for the thermocouple spot welder, and the external power supply also limits its application scenarios. Summary of the Invention

[0004] The purpose of this invention is to provide a thermocouple spot welding device, which is smaller and more portable.

[0005] To solve the above-mentioned technical problems, the present invention provides a thermocouple spot welding device, comprising:

[0006] Power supply battery, used to output DC power;

[0007] The voltage conversion module has its input terminal connected to the output terminal of the power supply battery;

[0008] The voltage regulation module is used to output control signals;

[0009] The control module has an input terminal connected to the output terminal of the voltage regulation module and an output terminal connected to the control terminal of the voltage conversion module. It is used to control the voltage conversion module to convert the DC power supply into the target voltage corresponding to the control signal based on the control signal output by the voltage regulation module.

[0010] The energy storage module has its input end connected to the output end of the voltage conversion module. The output end serves as the output end of the thermocouple spot welding device and is used to charge the device based on the target voltage output by the voltage conversion module, so as to generate welding current based on the stored energy after charging.

[0011] Optionally, the voltage conversion module includes:

[0012] The first inductor has its first terminal connected to the positive output terminal of the power supply battery.

[0013] Changeover switch;

[0014] The first capacitor has its first terminal connected to the second terminal of the first inductor and the first terminal of the changeover switch, respectively.

[0015] Second inductor;

[0016] The positive terminal of the freewheeling diode is connected to the second terminal of the first capacitor and the first terminal of the second inductor, respectively.

[0017] The second capacitor has its first end connected to the negative terminal of the freewheeling diode and serving as the first output terminal of the voltage conversion module. Its second end is connected to the second terminal of the changeover switch, the second terminal of the second inductor, and the negative output terminal of the power supply battery, and also serves as the second output terminal of the voltage conversion module.

[0018] The control module is specifically used to control the changeover switch to operate according to the duty cycle corresponding to the control signal based on the control signal output by the voltage regulation module, so that the voltage conversion module converts the DC power supply into the target voltage corresponding to the control signal.

[0019] Optionally, the voltage conversion module further includes:

[0020] The voltage divider circuit has a first input terminal connected to the negative terminal of the freewheeling diode and the first terminal of the second capacitor, a second input terminal grounded, and an output terminal connected to the input terminal of the control module. It is used to divide the output voltage of the voltage conversion module and output it to the control module.

[0021] Optionally, the voltage regulating module includes:

[0022] The first current limiting module has a control signal connected to its first terminal.

[0023] The first operational amplifier has its non-inverting input terminal connected to the second terminal of the first current limiting module, its power supply terminal connected to the power supply, and its ground terminal grounded.

[0024] The positive terminal of the first unidirectional conduction module is connected to the output terminal of the first operational amplifier.

[0025] The second current limiting module has its first terminal connected to the negative terminal of the first unidirectional conduction module and the inverting input terminal of the first operational amplifier, respectively, and its second terminal serving as the output terminal of the voltage regulation module.

[0026] Optionally, the voltage regulating module further includes:

[0027] The first filtering module has its first terminal connected to the second terminal of the first current limiting module and the non-inverting input terminal of the first operational amplifier, respectively, and its second terminal grounded.

[0028] And / or,

[0029] The second filter module has its first end connected to the power supply terminal of the first operational amplifier, and its second end grounded.

[0030] Optional, also includes:

[0031] The human-computer interaction module has its output end connected to the signal receiving end of the control module, and is used to receive user commands and transmit the user commands to the control module.

[0032] The signal transmitting end of the control module is connected to the input end of the voltage regulating module, and is used to convert the received user command into a digital voltage signal and output the digital voltage signal to the voltage regulating module.

[0033] Optional, also includes:

[0034] The first protection module has its input terminal connected to the output terminal of the voltage conversion module and its output terminal connected to the input terminal of the control module. It is used to collect the charging parameters output by the voltage conversion module to the energy storage module and output a first protection signal to the control module based on the charging parameters, so that the control module can determine whether to execute the corresponding protection strategy based on the received first protection signal.

[0035] And / or,

[0036] The second protection module has its input end connected to the output end of the energy storage module and its output end connected to the input end of the control module. It is used to collect the welding current output by the energy storage module and output a second protection signal to the control module based on the welding current, so that the control module can determine whether to execute the corresponding protection strategy based on the received second protection signal.

[0037] Optionally, the first protection module includes:

[0038] The third current limiting module has its first terminal connected to the output terminal of the voltage conversion module.

[0039] Third capacitor;

[0040] The second operational amplifier has its non-inverting input terminal connected to the second terminal of the third current limiting module and the first terminal of the third capacitor, respectively. Its power supply terminal is connected to the power supply, and its ground terminal is grounded.

[0041] The first feedback resistor has its first end connected to the second end of the third capacitor and grounded.

[0042] The first end of the second feedback resistor is connected to the second end of the first feedback resistor and the inverting input of the second operational amplifier, respectively.

[0043] The positive terminal of the second unidirectional conduction module is connected to the output terminal of the second operational amplifier.

[0044] The fourth current limiting module has its first terminal connected to the negative terminal of the second unidirectional conduction module and the second terminal of the second feedback resistor, respectively, and its second terminal serves as the output terminal of the first protection module.

[0045] The control module is also configured to control the target voltage output by the voltage conversion module to decrease when an increase in the voltage at the output terminal of the first protection module is detected; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the first protection module.

[0046] Optionally, the second protection module includes:

[0047] The fifth current limiting module has its first end connected to the output end of the energy storage module;

[0048] The third feedback resistor has its first terminal grounded.

[0049] Third operational amplifier;

[0050] The fourth feedback resistor has its first end connected to the second end of the third feedback resistor and the non-inverting input terminal of the third operational amplifier, and its second end connected to the power supply terminal of the third operational amplifier and connected to the power supply.

[0051] The fourth capacitor has its first end connected to the second end of the fifth current limiting module and the inverting input of the third operational amplifier, respectively, and its second end connected to the ground terminal of the third operational amplifier and grounded.

[0052] The positive terminal of the third unidirectional conduction module is connected to the output terminal of the third operational amplifier.

[0053] The sixth current limiting module has its first end connected to the negative terminal of the third unidirectional conduction module, and its second end serving as the output terminal of the second protection module.

[0054] The control module is also used to control the target voltage output by the voltage conversion module to decrease when an increase in the voltage at the output terminal of the second protection module is detected; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the second protection module.

[0055] Optionally, the thermocouple spot welding device further includes:

[0056] A power switch has a first terminal connected to the output terminal of the power supply battery, a second terminal connected to the input terminal of the voltage conversion module, and a control terminal connected to the output terminal of the control module, used to turn the switch on or off based on the control of the control module.

[0057] The second protection module also includes:

[0058] Output resistor, first terminal grounded;

[0059] The first end of the output capacitor is connected to the second end of the output resistor, the positive terminal of the third unidirectional conduction module, and the output terminal of the third operational amplifier, respectively, and the second end is grounded.

[0060] The control module is also used to control the power supply switch to turn off when an increase in the voltage at the output terminal of the second protection module is detected multiple times within a preset time period.

[0061] This invention provides a thermocouple spot welding device, including a power supply battery, a voltage conversion module, a voltage regulation module, a control module, and an energy storage module. The voltage conversion module converts the DC power output from the power supply battery into a target voltage to charge the energy storage module, enabling the charged energy storage module to discharge using stored electrical energy, thereby generating a high-power welding current. By directly incorporating the power supply battery within the thermocouple spot welding device, the power supply design allows the device to independently perform thermocouple spot welding, improving its portability and expanding its applicable scenarios. Furthermore, the device only requires a voltage conversion module to convert DC power for charging the energy storage module, simplifying the design and reducing the overall size of the thermocouple spot welding device. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0063] Figure 1 This is a schematic diagram of the structure of a thermocouple spot welding device provided by the present invention;

[0064] Figure 2 A schematic diagram of another thermocouple spot welding device provided by the present invention;

[0065] Figure 3 A schematic diagram of the overall shape of a thermocouple spot welding device provided by the present invention;

[0066] Figure 4 This invention provides a schematic diagram of the working process of a thermocouple spot welding device.

[0067] Figure 5 This invention provides a schematic diagram of the structure of a voltage conversion module;

[0068] Figure 6 This is a schematic diagram of the internal circuit structure of a thermocouple spot welding device provided by the present invention. Detailed Implementation

[0069] The core of this invention is to provide a thermocouple spot welding device. A power supply battery is installed inside the thermocouple spot welding device to realize the power supply design, which improves the portability of the entire thermocouple spot welding device and expands the applicable scenarios of the thermocouple spot welding device. At the same time, only a voltage conversion module needs to be set in the thermocouple spot welding device to convert DC power to realize the charging of the energy storage module, simplifying the design and reducing the size of the entire thermocouple spot welding device.

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0071] See Figure 1 As shown, Figure 1 This is a schematic diagram of a thermocouple spot welding device provided by the present invention; to solve the above-mentioned technical problems, the present invention provides a thermocouple spot welding device, comprising:

[0072] Power supply battery 1, used to output DC power;

[0073] Voltage conversion module 2, the input terminal of which is connected to the output terminal of power supply battery 1;

[0074] Voltage regulating module 3 is used to output control signals;

[0075] Control module 4 has its input terminal connected to the output terminal of voltage regulation module 3 and its output terminal connected to the control terminal of voltage conversion module 2. It is used to control voltage conversion module 2 to convert DC power supply into target voltage corresponding to control signal based on control signal output by voltage regulation module 3.

[0076] The energy storage module 5 has its input end connected to the output end of the voltage conversion module 2. Its output end serves as the output end of the thermocouple spot welding device and is used to charge the device based on the target voltage output by the voltage conversion module 2, so as to generate welding current based on the stored energy after charging.

[0077] It is easy to understand that, in order to avoid the impact of external power supply on the portability and applicable scenarios of the thermocouple spot welding device, this application directly sets up a power supply battery 1 in the thermocouple spot welding device to provide the power required for the entire thermocouple spot welding device to work. At the same time, considering that the welding energy required by the thermocouple varies under different application scenarios, such as when the material or specifications of the metal wire in the thermocouple are different, the thermocouple spot welding device needs to be able to provide different levels of welding energy to meet the welding needs of the thermocouple in different scenarios. Therefore, a voltage conversion module 2 is set up in the thermocouple spot welding device to convert the DC power output from the power supply battery 1. Under the action of the control module 4, the voltage conversion module 2 can convert the DC power into different target voltages, thereby regulating the full charge voltage of the energy storage module 5 in a steady state when it is fully charged, so as to achieve different welding energies.

[0078] Understandably, the operator issues user commands to instruct the thermocouple spot welding device to achieve the specific target voltage value. These user commands are processed by the analog-to-digital converter in control module 4 and converted into a digital voltage signal. This digital voltage signal is then processed by voltage regulation module 3 to obtain a control signal, which is output to the driver chip in control module 4. This allows the driver chip in control module 4 to accurately determine the target voltage required for the current operation. Control module 4 then generates corresponding adjustment commands based on the specific magnitude of the target voltage, controlling the operating state of voltage conversion module 2. Simultaneously, the power supply battery 1 outputs DC power to voltage conversion module 2. Under the influence of these adjustment commands, voltage conversion module 2 operates in the corresponding state, accurately converting the DC power to the required target voltage. The converted target voltage is then output to energy storage module 5 to charge it. Once energy storage module 5 is fully charged and reaches a steady state, the discharge process of the stored energy in the fully charged energy storage module 5 can be used to generate welding current. The power supply required for the operation of voltage regulating module 3, control module 4, and other circuit modules in the thermocouple spot welding device is also provided by power supply battery 1. Power supply battery 1 can provide the power required for the operation of the entire thermocouple spot welding device.

[0079] It should be noted that the energy storage module 5 uses its own energy storage to provide energy for welding. For safe application, the output end of the thermocouple spot welding device will adopt an output port, and the energy storage module 5 is connected to the output port of the thermocouple spot welding device, which has two working states of charging and discharging. In the charging state, the control module 4 controls the power supply battery 1 to charge the energy storage module 5 through the voltage conversion module 2, and the energy storage module 5 continuously charges and stores energy; in the discharging state, the energy storage module 5 provides energy for the spot welding of the thermocouple through the discharge current.

[0080] It is not difficult to understand that the amount of stored energy of the energy storage module 5 after being fully charged depends on the magnitude of the target voltage input to the energy storage module 5, and the two are positively correlated. That is, the larger the target voltage, the greater the stored energy of the energy storage module 5 in the steady state after being fully charged, that is, the greater the welding energy that the thermocouple spot welding device can provide, and the welding current generated by discharging the energy storage module 5 can also reach a higher current and higher power level. Usually, the two output ends of the voltage conversion module 2 are connected in parallel with both ends of the energy storage module 5. At this time, when the voltage at both ends of the energy storage module 5 reaches the target voltage, it means that the energy storage module 5 is fully charged; the specific implementation method of the energy storage module 5 and the specific judgment method of being fully charged are not particularly limited in this application. In this application, it is mainly described by taking the energy storage module 5 as an example implemented by using energy storage capacitors. In actual applications, other types of energy storage elements can also be used. Since a large current and high power are required instantaneously during thermocouple spot welding, in order to increase the energy storage capacity of the energy storage module 5, the energy storage module 5 can specifically be implemented by connecting multiple capacitor elements in parallel, for example, by using two 15000uF capacitors connected in parallel. In the thermocouple spot welding device, a shutdown discharge circuit and other structures supporting the energy storage module 5 also need to be provided to facilitate the release of the energy stored in the energy storage module 5 after the thermocouple spot welding device is shut down, ensuring the safety of the entire device after shutdown; other types of supporting circuits can also be added, which are not particularly limited in this application. The process of the shutdown discharge circuit and the energy storage module 5 discharging for welding can also be directly controlled and implemented by the control module 4.

[0081] It should be noted that this application does not impose any particular limitations on the specific types and implementation methods of the power supply battery 1, voltage conversion module 2, voltage regulation module 3, and control module 4. The power supply battery 1 can be implemented using various types of batteries, such as lithium batteries. A preferred embodiment uses a rechargeable battery. The specific voltage specifications of its output DC power supply are not specifically limited here. The thermocouple spot welding device can further be equipped with a corresponding power management chip to control the charging and discharging of the power supply battery 1. The power management chip can integrate multiple fast charging protocols, a fuel gauge, temperature monitoring, active balancing, and other functions. It can also include protection functions such as input overvoltage / undervoltage protection, output overcurrent / short circuit protection, battery overcharge / overdischarge / overcurrent protection, IC (Integrated Circuit) overtemperature protection, and battery temperature protection. The voltage conversion module 2 can be implemented using various types of DC-DC conversion circuits. A preferred embodiment uses a DC-DC conversion circuit with both boost and buck functions to accurately control the target voltage output to the energy storage module 5 under the regulation of the control module 4. The voltage regulation module 3 is mainly used to preprocess the digital voltage signal corresponding to the user command to obtain the control signal, including but not limited to amplification, filtering and other preprocessing processes. The corresponding circuit structure can be set according to the required preprocessing process to cooperate with the voltage conversion module 2 to achieve a more accurate target voltage output. This application does not specifically limit the specific type and implementation method of the user command and control signal; a preferred embodiment of the control signal is implemented using a voltage signal. The control module 4 can also establish communication with the power management chip of the power supply battery 1 to cooperate in completing the power-on and power-off functions of the thermocouple spot welding device. The control module 4 is connected to each module in the thermocouple spot welding device, and can realize the acquisition of signals corresponding to each module (such as real-time acquisition of the voltage output from the voltage conversion module 2 to the energy storage module 5 for closed-loop control), communication with other modules, and corresponding control (such as controlling the voltage conversion module 2 to perform step-up and step-down adjustment to achieve the target voltage output). Specifically, it can be implemented by using an MCU (Microcontroller Unit) chip in conjunction with a driver chip and corresponding peripheral circuits. The driver chip is specifically used to drive and control the voltage conversion module 2, and the MCU chip is used to implement other functions of the control module, such as receiving and processing user commands and controlling protection strategies. Specifically, it can be implemented by using an HC32L196PCTA chip in conjunction with an MC33063A chip.This application does not impose any special restrictions on the specific communication methods between the control module 4 and other modules, including but not limited to RS232, RS485, RS422, CAN (Controller Area Network), USB (Universal Serial Bus), etc.

[0082] Further, see Figure 2 As shown, Figure 2 This is a schematic diagram of another thermocouple spot welding device provided by the present invention. For ease of application, the thermocouple spot welding device can also be equipped with a housing 8, in which the power supply battery 1, voltage conversion module 2, voltage regulation module 3, control module 4, and energy storage module 5 are all housed. The specific type and implementation of the housing 8 are not particularly limited here; it can be made of stainless steel or galvanized steel sheet, etc. An output interface 7 is externally provided on the housing 8, which is connected to the output end of the energy storage module 5 to provide welding energy. The thermocouple spot welding device can also be equipped with a human-machine interaction module 6, etc., according to actual application requirements; these are not particularly limited here.

[0083] As one specific embodiment, see Figure 3 As shown, Figure 3 This is a schematic diagram of the overall shape of a thermocouple spot welding device provided by the present invention. To ensure safety, a set of output interfaces 7 are provided on the outside of the housing 8 of the thermocouple spot welding device to facilitate connection with the thermocouple during spot welding. These interfaces include a positive output 72 and a negative output 71. The positive output 72 is connected to a clamp 74, facilitating connection with the thermocouple via the clamp 74 during welding. The negative output 71 is connected to a carbon rod 73 and a carbon base 75, respectively. The housing 8 also includes a rotary switch and a display screen as a human-machine interface module 6, and a charging port 81 for charging the power supply battery 1.

[0084] Further, see Figure 4 As shown, Figure 4This invention provides a schematic diagram of the working process of a thermocouple spot welding device. Taking a thermocouple spot welding device equipped with a rotary switch and a display screen as an example, the human-machine interface module 6 is used. After power-on, the control module 4 initializes, communicates with the display screen, turns on the display screen, and controls the thermocouple spot welding device to enter the voltage regulation state. In the voltage regulation state, the operator can adjust the target voltage required for the current spot welding using the rotary switch. After adjustment, a specific button switch is pressed on the display screen. After the control module 4 confirms that the button switch has been pressed, it controls the thermocouple spot welding device to enter the output state and simultaneously controls the rotary switch to enter the locked state. In the locked state, the rotary switch cannot adjust the target voltage and will not update the control signal. The rotary switch can only adjust the target voltage when it is in the unlocked state. In the output state, the control module 4 receives the user command corresponding to the rotary switch and obtains the control signal corresponding to the user command through the voltage regulation module 3, thereby controlling the voltage conversion module 2 to work and accurately output the target voltage. At the same time, the control module 4 monitors the real-time output voltage of the voltage conversion module 2 and displays the monitoring results on the display screen. In output mode, control module 4, in conjunction with the second protection module, will determine in real time whether overcurrent protection needs to be triggered. Human-machine interface module 6 can also display the current welding current in real time. If overcurrent protection is triggered, the display screen will show an alarm; if overcurrent protection is not triggered, the output mode will be maintained, continuously outputting the target voltage to charge energy storage module 5. If the operator presses the button switch again, the locked state will be released, returning to the voltage regulation state, or an additional single-button button can be provided specifically for releasing the locked state. Simultaneously, when the operator presses and holds the button switch, control module 4 will control the thermocouple spot welding device to shut down based on this long-press signal. After shutdown, energy storage module 5 will self-discharge.

[0085] This application provides a portable thermocouple spot welding device. The device has an internal power supply battery 1 that provides stable power to the entire device, eliminating the need for an external power source and significantly improving its portability. Simultaneously, a voltage conversion module 2, in conjunction with a control module 4, regulates the voltage output to the energy storage module 5, achieving precise adjustment of the target voltage. This avoids the need for AC-to-DC conversion circuits, reducing the overall size of the thermocouple spot welding device and preventing operational inconvenience caused by bulky equipment. Furthermore, the voltage conversion module 2 allows for compatibility with different working scenarios, materials, and thermocouple welding requirements.

[0086] See Figure 5 As shown, Figure 5 A schematic diagram of the structure of a voltage conversion module provided by the present invention; see also Figure 6 As shown, Figure 6 This is a schematic diagram of the internal circuit structure of a thermocouple spot welding device provided by the present invention. Figure 6 Lines marked with double underscores indicate logical connections, which can be implemented through hardware circuit connections or software communication connections; lines without double underscores indicate hardware circuit connections; as an optional embodiment, voltage conversion module 2 includes:

[0087] The first inductor L1 has its first terminal connected to the positive output terminal of the power supply battery 1.

[0088] Changeover switch Q1;

[0089] The first capacitor C1 has its first terminal connected to the second terminal of the first inductor L1 and the first terminal of the changeover switch Q1, respectively.

[0090] Second inductor L2;

[0091] The positive terminal of the freewheeling diode D0 is connected to the second terminal of the first capacitor C1 and the first terminal of the second inductor L2, respectively.

[0092] The second capacitor C2 has its first end connected to the negative terminal of the freewheeling diode D0 and serves as the first output terminal of the voltage conversion module 2. Its second end is connected to the second terminal of the changeover switch Q1, the second terminal of the second inductor L2, and the negative output terminal of the power supply battery 1, and serves as the second output terminal of the voltage conversion module 2.

[0093] The control module 4 is specifically used to control the changeover switch Q1 to work according to the duty cycle corresponding to the control signal based on the control signal output by the voltage regulation module 3, so that the voltage conversion module 2 converts the DC power supply into the target voltage corresponding to the control signal.

[0094] It can be understood that the voltage conversion module 2 can be specifically implemented by using a Sepic circuit including a first inductor L1, a switching switch Q1, a first capacitor C1, a second inductor L2, a freewheeling diode D0, and a second capacitor C2. The Sepic circuit performs buck-boost processing on the DC power supply provided by the power supply battery 1, so as to output a target voltage to charge the energy storage module 5. Specifically, the switching switch Q1 operates in a high-frequency on-off state. When the switching switch Q1 is turned on, the DC power supply charges the first inductor L1, the first capacitor C1 charges the second inductor L2, and the second capacitor C2 discharges to the energy storage module 5. When the switching switch Q1 is turned off, the first inductor L1 releases energy to charge the first capacitor C1, the second inductor L2 releases energy to charge the second capacitor C2, and the DC power supply charges the energy storage module 5 through the first inductor L1, the first capacitor C1, and the freewheeling diode D0. The switching switch Q1 operates in CCM (Continuous Conduction Mode), maintains a constant voltage output of the target voltage, and continuously charges the energy storage module 5 in a constant voltage charging manner. The relationship between the output voltage Vout and the input voltage Vin of the entire voltage conversion module 2 is: M = Vout / Vin = D / (1 - D); where M is the voltage gain, D is the duty cycle of the switching switch Q1 (the ratio of the time when the switching switch Q1 is in the on state to a complete switching cycle), and 0 < D < 1. When D < 0.5, M < 1, and the voltage conversion module 2 operates in a buck mode; when D > 0.5, M > 1, and the voltage conversion module 2 operates in a boost mode. The input voltage Vin is also the power supply voltage of the DC power supply output by the power supply battery 1.

[0095] Furthermore, therefore, the control module 4 specifically needs to control the operating state of the voltage conversion module 2 by controlling the action of the switching switch Q1 in the voltage conversion module 2, and controls the switching switch Q1 to perform high-frequency on-off according to different duty cycles by issuing different duty cycles, so as to achieve the output of target voltages of different magnitudes. In the control module 4, a driving chip or the like can be specifically set to provide a driving signal with a corresponding duty cycle to control the switching switch Q1 to operate according to the duty cycle corresponding to the control signal.

[0096] It should be noted that the specific types and implementation manners of the first inductor L1, the switching switch Q1, the first capacitor C1, the second inductor L2, the freewheeling diode D0, and the second capacitor C2 are not specifically limited in this application, such as Figure 6As shown, the first inductor L1 can be implemented using the primary winding of transformer T1, the second inductor L2 can be implemented using the secondary winding of transformer T1, and the changeover switch Q1 can be implemented using various types of power electronic switching transistors such as MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistors) and IGBTs (Insulated Gate Bipolar Transistors). Figure 6 As shown, this can be implemented using MOSFETs Q11 and Q12 connected in parallel. Using two parallel MOSFETs for current shunting provides higher safety. The first capacitor C1 can be implemented using several capacitors connected in parallel, for example... Figure 6 The capacitors C11, C12, C13, and C14 are shown in parallel connection. Other components can be added to voltage conversion module 2 according to actual application requirements, such as... Figure 6 As shown, a resistor R4 is added between the control terminal of the changeover switch Q1 and the output terminal of the control module 4 to limit current and ensure the safety of the changeover switch Q1. A grounded pull-down resistor can also be added to the control terminal of the changeover switch Q1.

[0097] Specifically, the voltage conversion module 2 is implemented using integrable discrete components. The entire voltage conversion module 2 can be integrated onto a circuit board for application, significantly reducing the size of the thermocouple spot welding device and facilitating its portability. The entire circuit structure is simple and easy to implement.

[0098] As an optional embodiment, the voltage conversion module 2 further includes:

[0099] The voltage divider circuit has its first input terminal connected to the negative terminal of the freewheeling diode D0 and the first terminal of the second capacitor C2, its second input terminal grounded, and its output terminal connected to the input terminal of the control module 4. It is used to divide the output voltage of the voltage conversion module 2 and output it to the control module 4.

[0100] It is easy to understand that, in order to achieve an accurate target voltage output, a voltage divider circuit can be further set in the voltage conversion module 2. The voltage divider circuit is used to divide the output voltage of the voltage conversion module 2 before outputting it. The control module 4 receives the voltage divider output result and determines the real-time output voltage of the voltage conversion module 2 based on this voltage divider output result. This determines whether the voltage conversion module 2 accurately outputs the target voltage and can adjust the duty cycle of the conversion switch Q1 accordingly, so that the output voltage of the voltage conversion module 2 can be stably maintained at the target voltage, thus realizing closed-loop control of the voltage conversion module 2. When the control signal output by the voltage regulating module 3 is implemented as a voltage signal, the output terminal of the voltage regulating module 3 and the output terminal of the voltage divider circuit can be connected to the control module 4 through the same circuit common connection point. That is, the control signal output by the voltage regulating module 3 and the feedback signal output by the voltage divider circuit are output to the control module 4 in the form of a voltage signal. At this time, if there is a negative correlation between the control signal and the target voltage, the upper limit configuration of the target voltage can be achieved by setting the voltage divider circuit, so as to avoid the control module 4 receiving 0 voltage when the voltage value of the control signal is 0. When the control signal is 0, the control module 4 can also reliably control the output voltage of the voltage conversion module 2 based on the feedback signal output by the voltage divider circuit, so as to ensure the controllability of the output voltage of the voltage conversion module 2.

[0101] It should be noted that this application does not impose any special limitations on the specific type and implementation method of the voltage divider circuit. It can be implemented by building a circuit using multiple resistive elements, such as... Figure 6 As shown, a voltage divider circuit is built using resistors R1, R2, and R3. Resistors R1, R2, and R3 are connected in series, and one end of the series-connected circuit is connected to the negative terminal of the freewheeling diode D0 and the first end of the second capacitor C2, respectively. The other end of the series-connected circuit is grounded, and the series connection point between resistors R2 and R3 serves as the output terminal of the voltage divider circuit.

[0102] Specifically, by setting up a voltage divider circuit, it is possible to cooperate with the control module 4 to achieve closed-loop control of the voltage conversion module 2, further improving the accuracy and reliability of the voltage conversion module 2 when outputting the target voltage, and ensuring the controllability of welding energy.

[0103] As an optional embodiment, the voltage regulating module 3 includes:

[0104] The first current limiting module RX1 has a control signal connected to its first terminal.

[0105] The first operational amplifier U1 has its non-inverting input terminal connected to the second terminal of the first current limiting module RX1, its power supply terminal connected to the power supply, and its ground terminal grounded.

[0106] The positive terminal of the first unidirectional conduction module D1 is connected to the output terminal of the first operational amplifier U1;

[0107] The second current limiting module RX2 has its first terminal connected to the negative terminal of the first unidirectional conduction module D1 and the inverting input terminal of the first operational amplifier U1, and its second terminal serving as the output terminal of the voltage regulation module 3.

[0108] It is understood that the voltage regulation module 3 specifically includes a first current limiting module RX1, a first operational amplifier U1, a first unidirectional conduction module D1, and a second current limiting module RX2. The digital voltage signal DAC_OUT obtained by the control module 4 through user commands is connected to the first terminal of the first current limiting module RX1, and output through the first current limiting module RX1 to the first operational amplifier U1. After amplification by the first operational amplifier U1, it is then output to the control module 4 through the first unidirectional conduction module D1 and the second current limiting module RX2. This application does not specifically limit the specific type and implementation method of the control signal, such as... Figure 6 As shown, the control signal can be directly implemented using voltage signals, etc. The control signal is generated after the human-machine interface module 6 receives the user command. The control module 4 communicates with the human-machine interface module 6 to obtain the user command, processes the user command, converts the user command into a digital voltage signal, and then outputs it to the voltage regulation module 3. This application does not specifically limit the specific types and implementation methods of the first current limiting module RX1, the first operational amplifier U1, the first unidirectional conduction module D1, and the second current limiting module RX2, such as... Figure 6 As shown, the first current limiting module RX1 and the second current limiting module RX2 can be directly implemented using resistors, and the first unidirectional conduction module D1 can be implemented using diodes. The power supply VCC for the first operational amplifier U1 can be directly reused from the power supply battery 1.

[0109] Specifically, the voltage regulating module 3 is implemented by using integrable discrete components to build the circuit. The entire voltage regulating module 3 is integrated onto the circuit board for application, which significantly reduces the size of the thermocouple spot welding device and facilitates its portability. The entire circuit structure is simple and easy to implement.

[0110] As an optional embodiment, the voltage regulating module 3 further includes:

[0111] The first filter module has its first terminal connected to the second terminal of the first current limiting module RX1 and the non-inverting input terminal of the first operational amplifier U1, and its second terminal grounded.

[0112] And / or,

[0113] The second filter module has its first end connected to the power supply terminal of the first operational amplifier U1, and its second end grounded.

[0114] It is easy to understand that, in order to further improve the accuracy and reliability of the control signal, a first filter module and / or a second filter module can be added to the voltage regulation module 3. The first filter module is set at the input terminal of the first operational amplifier U1 to filter the initial control signal input to the first operational amplifier U1; the second filter module is set at the power supply terminal of the first operational amplifier U1 to filter the power supply output to the first operational amplifier U1, ensuring that the first operational amplifier U1 can receive a stable and reliable power supply. A filter module can also be set at the output terminal of the first operational amplifier U1 according to actual application requirements, etc., which is not specifically limited in this application. The specific types and implementation methods of the first and second filter modules are not specifically limited in this application, such as... Figure 6 As shown, the first filtering module can be implemented using a single capacitor (capacitor C31), and the second filtering module can be implemented using a single capacitor (capacitor C32).

[0115] Specifically, by setting the first filtering module and / or the second filtering module, the accuracy and reliability of the control signal output to the control module 4 can be further improved, thereby ensuring the accuracy and reliability of the target voltage output by the voltage conversion module 2.

[0116] As an optional embodiment, it also includes:

[0117] The human-computer interaction module 6 has its output end connected to the signal receiving end of the control module 4, and is used to receive user commands and transmit the user commands to the control module 4.

[0118] The signal transmitting end of the control module 4 is connected to the input end of the voltage regulating module 3, and is used to convert the received user command into a digital voltage signal and output the digital voltage signal to the voltage regulating module 3.

[0119] It is understandable that, for ease of use, the thermocouple spot welding device can be further equipped with a human-machine interface module 6. On one hand, the human-machine interface module 6 can receive user commands to instruct the control module 4 to specify the target voltage currently output by the voltage conversion module 2. On the other hand, the human-machine interface module 6 can also cooperate with the control module 4 to display the overall operating status of the thermocouple spot welding device, such as real-time display of the output voltage of the voltage conversion module 2. The human-machine interface module 6 communicates with the control module 4 and can provide various human-machine interaction functions, not limited to those described in this embodiment. For example, it can also implement the power on / off operation of the entire thermocouple spot welding device through button design; such as... Figure 4As shown, it can specifically cooperate with control module 4 to realize the voltage regulation status, output status, and alarm status of the thermocouple spot welding device; this working status can also be displayed through human-machine interaction module 6. This application does not specifically limit the specific type and implementation method of human-machine interaction module 6. In order to receive user commands, human-machine interaction module 6 may include a rotary switch, or a push-button switch, etc. Specifically, it can be implemented through an interactive interface, for example, human-machine interaction module 6 can be implemented using an RKM477L screen with button and knob functions.

[0120] Specifically, through the design of the human-machine interaction module 6, it can work with the control module 4 to achieve more intelligent and controllable thermocouple spot welding, and facilitate operators to issue user commands corresponding to the target voltage required under actual conditions, thereby realizing flexible adjustment and configuration of welding energy.

[0121] As an optional embodiment, it also includes:

[0122] The first protection module has its input terminal connected to the output terminal of the voltage conversion module 2 and its output terminal connected to the input terminal of the control module 4. It is used to collect the charging parameters output by the voltage conversion module 2 to the energy storage module 5, and output a first protection signal to the control module 4 based on the charging parameters, so that the control module 4 can determine whether to execute the corresponding protection strategy based on the received first protection signal.

[0123] And / or,

[0124] The second protection module has its input end connected to the output end of the energy storage module 5 and its output end connected to the input end of the control module 4. It is used to collect the welding current output by the energy storage module 5 and output a second protection signal to the control module 4 based on the welding current, so that the control module 4 can determine whether to execute the corresponding protection strategy based on the received second protection signal.

[0125] It is easy to understand that, for safety reasons, the thermocouple spot welding device can be further equipped with a first protection module and / or a second protection module. These modules work in conjunction with the control module 4 to protect the thermocouple spot welding device, primarily through current limiting protection. The first protection module primarily uses the charging parameters output by the voltage conversion module 2 as a reference for protection. Specifically, the charging parameters are the output current of the voltage conversion module 2. The first protection module responds in real-time to the output current of the voltage conversion module 2, outputting a first protection signal so that the control module 4 can determine whether there is an overcurrent at the output of the voltage conversion module 2 and confirm whether an appropriate protection strategy needs to be implemented. The second protection module primarily uses the welding current discharged by the energy storage module 5 during welding as a reference for protection. The second protection module responds in real-time to the welding current output by the energy storage module 5, outputting a second protection signal so that the control module 4 can determine whether there is an overcurrent in the current welding flow and confirm whether an appropriate protection strategy needs to be implemented. This application does not impose any particular limitations on the specific types and implementation methods of the first and second protection modules. Specifically, current detection chips or similar methods can be used to collect the corresponding current, thereby coordinating with control to provide protection for the charging of the energy storage module 5 and the thermocouple welding discharge process. This application also does not impose any particular limitations on the specific types and implementation methods of the protection strategies. These can be achieved through various methods such as controlling the voltage conversion module 2 to reduce the output voltage or directly shutting down the device.

[0126] Specifically, by adding the first protection module and / or the second protection module, the control module 4 can be used to protect the charging of the energy storage module 5 and the thermocouple welding discharge process, thus ensuring the safety and reliability of the entire thermocouple spot welding device.

[0127] As an optional embodiment, the first protection module includes:

[0128] The third current limiting module RX3 has its first terminal connected to the output terminal of the voltage conversion module 2.

[0129] Third capacitor C3;

[0130] The second operational amplifier U2 has its non-inverting input terminal connected to the second terminal of the third current limiting module RX3 and the first terminal of the third capacitor C3, respectively. Its power supply terminal is connected to the power supply, and its ground terminal is grounded.

[0131] The first feedback resistor Rf1 has its first terminal connected to the second terminal of the third capacitor C3 and grounded;

[0132] The first end of the second feedback resistor Rf2 is connected to the second end of the first feedback resistor Rf1 and the inverting input of the second operational amplifier U2.

[0133] The positive terminal of the second unidirectional conduction module D2 is connected to the output terminal of the second operational amplifier U2;

[0134] The first terminal of the fourth current limiting module RX4 is connected to the negative terminal of the second unidirectional conduction module D2 and the second terminal of the second feedback resistor Rf2, and the second terminal serves as the output terminal of the first protection module.

[0135] The control module 4 is also used to control the target voltage output by the voltage conversion module 2 to decrease when the voltage at the output terminal of the first protection module increases; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the first protection module.

[0136] It is understood that the first protection module specifically includes a third current-limiting module RX3, a third capacitor C3, a second operational amplifier U2, a first feedback resistor Rf1, a second feedback resistor Rf2, a second unidirectional conduction module D2, and a fourth current-limiting module RX4. The third current-limiting module RX3 is connected to the output terminal of the voltage conversion module 2 through a current acquisition chip (e.g., a CC6920SO chip) to acquire the real-time charging current of the energy storage module 5 supplied by the voltage conversion module 2. When the charging current is too large, the voltage across the third current-limiting module RX3 increases. After being filtered by the third capacitor C3 and amplified by the second operational amplifier U2, the voltage is output to the fourth current-limiting module RX4, and the voltage across the fourth current-limiting module RX4 also increases accordingly. Thus, the voltage signal at the second terminal of the fourth current-limiting module RX4 serves as the first protection signal. The specific protection strategy is that when the control module 4 detects an increase in the voltage at the second terminal of the fourth current-limiting module RX4, it controls the target voltage output by the voltage conversion module 2 to decrease. By reducing the voltage output by the voltage conversion module 2, the charging current for the energy storage module 5 is reduced, thereby achieving protection. The first feedback resistor Rf1 and the second feedback resistor Rf2 serve to limit current, and together with the fourth current limiting module RX4, they achieve a voltage divider output for the first protection signal. The second unidirectional conduction module D2 specifies the current direction to prevent backflow. This application does not specifically limit the specific types and implementation methods of the third current limiting module RX3, the third capacitor C3, the second operational amplifier U2, the first feedback resistor Rf1, the second feedback resistor Rf2, the second unidirectional conduction module D2, and the fourth current limiting module RX4. Figure 6 As shown, the third current limiting module RX3 and the fourth current limiting module RX4 are both implemented using resistors, while the second unidirectional conduction module D2 is implemented using diodes.

[0137] Specifically, the first protection module is implemented by building a circuit using integrable discrete components. The entire first protection module can be integrated onto a circuit board for application, thereby significantly reducing the size of the thermocouple spot welding device and facilitating its portability. The entire circuit structure is simple and easy to implement.

[0138] As an optional embodiment, the second protection module includes:

[0139] The fifth current limiting module RX5 has its first end connected to the output end of the energy storage module 5;

[0140] The third feedback resistor Rf3 has its first terminal grounded.

[0141] Third operational amplifier U3;

[0142] The first end of the fourth feedback resistor is connected to the second end of the third feedback resistor Rf3 and the non-inverting input of the third operational amplifier U3, and the second end is connected to the power supply of the third operational amplifier U3 and connected to the power supply.

[0143] The first terminal of the fourth capacitor C4 is connected to the second terminal of the fifth current limiting module RX5 and the inverting input terminal of the third operational amplifier U3, respectively. The second terminal is connected to the ground terminal of the third operational amplifier U3 and is grounded.

[0144] The positive terminal of the third unidirectional conduction module D3 is connected to the output terminal of the third operational amplifier U3;

[0145] The sixth current limiting module RX6 has its first terminal connected to the negative terminal of the third unidirectional conduction module D3, and its second terminal serving as the output terminal of the second protection module.

[0146] The control module 4 is also used to control the target voltage output by the voltage conversion module 2 to decrease when the voltage at the output terminal of the second protection module increases; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the second protection module.

[0147] It is easy to understand that the second protection module specifically includes a fifth current limiting module RX5, a third feedback resistor Rf3, a third operational amplifier U3, a fourth feedback resistor, a fourth capacitor C4, a third unidirectional conduction module D3, and a sixth current limiting module RX6. The first terminal of the fifth current limiting module RX5 is connected to the output terminal of the energy storage module 5 through a current acquisition chip and a conversion chip. The current acquisition chip collects the welding current generated by the discharge of the energy storage module 5 in real time, and the conversion chip converts the welding current into a voltage signal iCapDischargeIN that is negatively correlated with the welding current. The voltage signal iCapDischargeIN is input to the second protection module. When the welding current is too large, the voltage across the fifth current limiting module RX5 decreases. The fifth current limiting module RX5 is connected to the inverting input terminal of the third operational amplifier U3. After being filtered by the fourth capacitor C4 and amplified by the third operational amplifier U3, the voltage across it is output to the sixth current limiting module RX6. The voltage across the sixth current limiting module RX6 will increase accordingly, and the voltage signal at the second terminal of the sixth current limiting module RX6 will serve as the second protection signal. The specific protection strategy is that when the control module 4 detects an increase in the voltage at the second terminal of the sixth current limiting module RX6, it controls the target voltage output by the voltage conversion module 2 to decrease. This decrease in the output voltage of the voltage conversion module 2 reduces the voltage across the energy storage module 5, preventing high voltage across the energy storage module 5 and thus achieving protection. The third unidirectional conduction module D3 specifies the current direction to prevent backflow. The third feedback resistor Rf3 and the fourth feedback resistor provide a stable positive voltage reference for the third operational amplifier U3. This application does not specifically limit the specific types and implementation methods of the fifth current limiting module RX5, the third feedback resistor Rf3, the third operational amplifier U3, the fourth feedback resistor, the fourth capacitor C4, the third unidirectional conduction module D3, and the sixth current limiting module RX6. Figure 6 As shown, the fifth current limiting module RX5 and the sixth current limiting module RX6 are both implemented using resistors, the third unidirectional conduction module D3 is implemented using diodes, and the fourth feedback resistor is implemented using resistors Rf41 and Rf42 connected in series.

[0148] Furthermore, considering that the control signal, first protection signal, second protection signal, and feedback signal output by the voltage regulator module 3 are all implemented using voltage signals, therefore, as Figure 6 As shown, these signals can all be implemented through the same voltage signal. The output terminals of the voltage regulating module 3, the first protection module, the second protection module, and the voltage divider circuit are all connected to the input terminal of the control module 4 through the same common connection point. The control module 4 can use this single voltage signal to achieve the output control of the target voltage and the control execution of the protection strategy.

[0149] Specifically, the first protection module is implemented by building a circuit using integrable discrete components. The entire first protection module can be integrated onto a circuit board for application, thereby significantly reducing the size of the thermocouple spot welding device and facilitating its portability. The entire circuit structure is simple and easy to implement.

[0150] As an optional embodiment, the thermocouple spot welding apparatus further includes:

[0151] The power supply switch K0 has its first terminal connected to the output terminal of the power supply battery 1, its second terminal connected to the input terminal of the voltage conversion module 2, and its control terminal connected to the output terminal of the control module 4. It is used to turn the switch on or off based on the control of the control module 4.

[0152] The second protection module also includes:

[0153] The output resistor R0 has its first terminal grounded.

[0154] The first terminal of the output capacitor C0 is connected to the second terminal of the output resistor R0, the positive terminal of the third unidirectional conduction module D3, and the output terminal of the third operational amplifier U3, respectively, and the second terminal is grounded.

[0155] The control module 4 is also used to control the power supply switch K0 to turn off when the voltage increase at the output terminal of the second protection module is detected multiple times within a preset time period.

[0156] Understandably, to ensure safety, the second protection module can further include an output resistor R0 and an output capacitor C0. These components filter the output voltage of the third operational amplifier U3 to obtain the level signal ProtectSTAT, which is then output to the control module 4. The control module 4 records the frequency of voltage increases at the output of the second protection module by receiving the ProtectSTAT level signal. When the voltage at the output of the second protection module repeatedly increases within a preset time period, or when it increases continuously, it indicates a severe overcurrent in the welding current. In this case, the control module 4 controls the power switch K0 to shut off, achieving enhanced short-circuit protection. Furthermore, it can be integrated with the human-machine interface module 6 to enter alarm mode, triggering an alarm through screen warnings or flashing. The specific value of the preset time period is not specifically limited here, and the criteria for multiple determinations can be set and adjusted according to actual application conditions.

[0157] It should be noted that, in order to achieve controllable operation of the thermocouple spot welding device, a power supply switch K0 can be further installed in series between the power supply battery 1 and the voltage conversion module 2. When the control module 4 detects that the power supply battery 1 is supplying power normally, it can control the power supply switch K0 to conduct, thereby controlling the power supply battery 1 to supply power to the voltage conversion module 2. This facilitates the charging and energy storage of the energy storage module 5 and subsequent discharge welding, enabling the thermocouple spot welding device to start up. When the power supply battery 1 is abnormal or requires overcurrent protection, the power supply switch K0 can be controlled to turn off. At this time, the power supply battery 1 will not supply power to the voltage conversion module 2, and the voltage conversion module 2 will not output voltage, thus shutting down the thermocouple spot welding device. This application does not impose any special limitations on the specific type and implementation method of the power supply switch K0; various types of switching devices can be used.

[0158] It should be further explained that, such as Figure 6 As shown, the entire thermocouple spot welding device is implemented using an integrable discrete component design, with each functional module circuit on an integrated circuit board. Figure 6 The four small circuit boards shown by the dotted lines are used to implement the thermocouple spot welding device, thereby significantly reducing the size of the thermocouple spot welding device and achieving portability. Furthermore, all modules of the thermocouple spot welding device are integrated inside the housing 8, according to... Figure 6 The thermocouple spot welding device is implemented in the manner shown. With a 30000uF energy storage capacitor as the energy storage device, the weight of the entire thermocouple spot welding device can be controlled within 800g, and the volume is approximately 160mm×100mm×60mm (length×width×height).

[0159] Specifically, the second protection module is implemented using integrable discrete components to build the circuit. The entire second protection module can be integrated onto a circuit board for application, which significantly reduces the size of the thermocouple spot welding device and facilitates its portability. The entire circuit structure is simple and easy to implement.

[0160] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0161] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermocouple spot welding device, characterized in that, include: Power supply battery, used to output DC power; The voltage conversion module has its input terminal connected to the output terminal of the power supply battery; The voltage regulation module is used to output control signals; The control module has an input terminal connected to the output terminal of the voltage regulation module and an output terminal connected to the control terminal of the voltage conversion module. It is used to control the voltage conversion module to convert the DC power supply into the target voltage corresponding to the control signal based on the control signal output by the voltage regulation module. The energy storage module has its input end connected to the output end of the voltage conversion module. The output end serves as the output end of the thermocouple spot welding device and is used to charge the device based on the target voltage output by the voltage conversion module, so as to generate welding current based on the stored energy after charging.

2. The thermocouple spot welding device according to claim 1, characterized in that, The voltage conversion module includes: The first inductor has its first terminal connected to the positive output terminal of the power supply battery. Changeover switch; The first capacitor has its first terminal connected to the second terminal of the first inductor and the first terminal of the changeover switch, respectively. Second inductor; The freewheeling diode has its positive terminal connected to the second terminal of the first capacitor and the first terminal of the second inductor, respectively. The second capacitor has its first end connected to the negative terminal of the freewheeling diode and serving as the first output terminal of the voltage conversion module. Its second end is connected to the second terminal of the changeover switch, the second terminal of the second inductor, and the negative output terminal of the power supply battery, and also serves as the second output terminal of the voltage conversion module. The control module is specifically used to control the changeover switch to operate according to the duty cycle corresponding to the control signal based on the control signal output by the voltage regulation module, so that the voltage conversion module converts the DC power supply into the target voltage corresponding to the control signal.

3. The thermocouple spot welding device according to claim 2, characterized in that, The voltage conversion module also includes: The voltage divider circuit has a first input terminal connected to the negative terminal of the freewheeling diode and the first terminal of the second capacitor, a second input terminal grounded, and an output terminal connected to the input terminal of the control module. It is used to divide the output voltage of the voltage conversion module and output it to the control module.

4. The thermocouple spot welding device according to claim 1, characterized in that, The voltage regulating module includes: The first current limiting module has a control signal connected to its first terminal. The first operational amplifier has its non-inverting input terminal connected to the second terminal of the first current limiting module, its power supply terminal connected to the power supply, and its ground terminal grounded. The positive terminal of the first unidirectional conduction module is connected to the output terminal of the first operational amplifier. The second current limiting module has its first terminal connected to the negative terminal of the first unidirectional conduction module and the inverting input terminal of the first operational amplifier, respectively, and its second terminal serving as the output terminal of the voltage regulation module.

5. The thermocouple spot welding device according to claim 4, characterized in that, The voltage regulating module also includes: The first filtering module has its first terminal connected to the second terminal of the first current limiting module and the non-inverting input terminal of the first operational amplifier, respectively, and its second terminal grounded. And / or, The second filter module has its first end connected to the power supply terminal of the first operational amplifier, and its second end grounded.

6. The thermocouple spot welding device according to claim 1, characterized in that, Also includes: The human-computer interaction module has its output end connected to the signal receiving end of the control module, and is used to receive user commands and transmit the user commands to the control module. The signal transmitting end of the control module is connected to the input end of the voltage regulating module, and is used to convert the received user command into a digital voltage signal and output the digital voltage signal to the voltage regulating module.

7. The thermocouple spot welding apparatus according to any one of claims 1 to 6, characterized in that, Also includes: The first protection module has its input terminal connected to the output terminal of the voltage conversion module and its output terminal connected to the input terminal of the control module. It is used to collect the charging parameters output by the voltage conversion module to the energy storage module and output a first protection signal to the control module based on the charging parameters, so that the control module can determine whether to execute the corresponding protection strategy based on the received first protection signal. And / or, The second protection module has its input end connected to the output end of the energy storage module and its output end connected to the input end of the control module. It is used to collect the welding current output by the energy storage module and output a second protection signal to the control module based on the welding current, so that the control module can determine whether to execute the corresponding protection strategy based on the received second protection signal.

8. The thermocouple spot welding apparatus according to claim 7, characterized in that, The first protection module includes: The third current limiting module has its first terminal connected to the output terminal of the voltage conversion module. Third capacitor; The second operational amplifier has its non-inverting input terminal connected to the second terminal of the third current limiting module and the first terminal of the third capacitor, respectively. Its power supply terminal is connected to the power supply, and its ground terminal is grounded. The first feedback resistor has its first end connected to the second end of the third capacitor and grounded. The first end of the second feedback resistor is connected to the second end of the first feedback resistor and the inverting input of the second operational amplifier, respectively. The positive terminal of the second unidirectional conduction module is connected to the output terminal of the second operational amplifier. The fourth current limiting module has its first terminal connected to the negative terminal of the second unidirectional conduction module and the second terminal of the second feedback resistor, respectively, and its second terminal serves as the output terminal of the first protection module. The control module is also configured to control the target voltage output by the voltage conversion module to decrease when an increase in the voltage at the output terminal of the first protection module is detected; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the first protection module.

9. The thermocouple spot welding apparatus according to claim 7, characterized in that, The second protection module includes: The fifth current limiting module has its first end connected to the output end of the energy storage module; The third feedback resistor has its first terminal grounded. Third operational amplifier; The fourth feedback resistor has its first end connected to the second end of the third feedback resistor and the non-inverting input terminal of the third operational amplifier, and its second end connected to the power supply terminal of the third operational amplifier and connected to the power supply. The fourth capacitor has its first end connected to the second end of the fifth current limiting module and the inverting input of the third operational amplifier, respectively, and its second end connected to the ground terminal of the third operational amplifier and grounded. The positive terminal of the third unidirectional conduction module is connected to the output terminal of the third operational amplifier. The sixth current limiting module has its first end connected to the negative terminal of the third unidirectional conduction module, and its second end serving as the output terminal of the second protection module. The control module is also used to control the target voltage output by the voltage conversion module to decrease when an increase in the voltage at the output terminal of the second protection module is detected; the amount of decrease in the target voltage is positively correlated with the amount of increase in the voltage at the output terminal of the second protection module.

10. The thermocouple spot welding apparatus according to claim 9, characterized in that, Also includes: A power switch has a first terminal connected to the output terminal of the power supply battery, a second terminal connected to the input terminal of the voltage conversion module, and a control terminal connected to the output terminal of the control module, used to turn the switch on or off based on the control of the control module. The second protection module also includes: Output resistor, first terminal grounded; The first end of the output capacitor is connected to the second end of the output resistor, the positive terminal of the third unidirectional conduction module, and the output terminal of the third operational amplifier, respectively, and the second end is grounded. The control module is also used to control the power supply switch to turn off when an increase in the voltage at the output terminal of the second protection module is detected multiple times within a preset time period.

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