Ultrasonic welding machine control system, control method and welding equipment

Abstract

The invention discloses an ultrasonic welding machine control system, a control method and welding equipment, and the control system is connected with an output circuit and an ultrasonic welding machine; the control system is used for controlling an input electric signal of the ultrasonic welding machine and the air pressure proportional valve and comprises a first detection module, a second detection module and a control module, the second detection module is used for detecting a first electric signal of the output circuit; and the control module is used for dynamically adjusting the input electric signal and adjusting the opening degree of the air pressure proportional valve according to the first pressure and the first electric signal, so that the input electric signal is kept at a constant value, and the opening degree is kept at a constant value. According to the method, the welding workpiece is welded through the constant input electric signal and the opening degree of the air pressure proportional valve, the stability of the welding power and the welding pressure during ultrasonic welding can be kept, and the welding quality can be improved. The method can be widely applied to the technical field of welding.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to an ultrasonic welding machine control system, a control method and welding equipment. Background Art

[0002] In the field of ultrasonic metal welding, cold welding and over-welding of workpieces are pain points that users often face. How to reduce the probability of cold welding and over-welding has become an urgent problem to be solved in the field of ultrasonic metal welding. In the prior art, in order to solve the above problems, an open-loop control method is usually used to control the welding equipment. However, the welding of workpieces usually requires a certain welding time. During the long welding process, the parameters of the welding equipment will undergo certain dynamic changes, resulting in a decrease in welding quality. Therefore, there are still technical problems that need to be improved in the relevant technology. Summary of the invention

[0003] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] To this end, an object of an embodiment of the present application is to provide an ultrasonic welding machine control system, a control method and a welding device, which can improve the welding quality.

[0005] In order to achieve the above-mentioned technical objectives, the technical solution adopted in the embodiment of the present application includes: a control system of an ultrasonic welding machine, the control system is connected to the output circuit, and the control system is connected to the ultrasonic welding machine; the control system is used to control the air pressure proportional valve and the input electrical signal of the ultrasonic welding machine, and the control system includes: a first detection module, used to detect the first pressure borne by the workpiece to be welded; a second detection module, used to detect the first electrical signal of the output circuit; a control module, used to adjust the input electrical signal and adjust the opening of the air pressure proportional valve according to the first pressure and the first electrical signal, so that the input electrical signal remains at a constant value and the opening remains at a constant value.

[0006] In addition, according to the ultrasonic welding machine control system of the above embodiment of the present invention, the following additional technical features may also be provided:

[0007] Furthermore, in an embodiment of the present application, the output circuit includes a radiator, and the ultrasonic welding machine control system also includes a third detection module; the third detection module is used to detect the first temperature of the radiator.

[0008] Furthermore, in an embodiment of the present application, the control module includes a driving circuit and an analysis circuit; the analysis circuit is connected to the driving circuit, the first detection module, the second detection module and the third detection module; the analysis circuit is used to generate a first control signal according to the first pressure, the first electrical signal and the first temperature signal, and the driving circuit is used to adjust the input electrical signal and adjust the opening of the air pressure proportional valve according to the first control signal.

[0009] Furthermore, in an embodiment of the present application, the control module also includes a protection circuit, which is connected to the drive circuit; the protection circuit is used to generate a second control signal based on the first pressure, the first electrical signal and the first temperature; the drive circuit is also used to adjust the input electrical signal to 0 according to the second control signal.

[0010] Furthermore, in an embodiment of the present application, the output circuit includes a rectifier and filter circuit, a power factor correction circuit, a full-bridge inverter circuit, a boost circuit and a filter circuit; the power factor correction circuit is connected to the rectifier and filter circuit and the full-bridge inverter circuit; the boost circuit is connected to the full-bridge inverter circuit and the filter circuit, and the filter circuit is connected to the ultrasonic welding machine.

[0011] Furthermore, in an embodiment of the present application, the driving circuit includes a PWM circuit, the output circuit includes a full-bridge inverter circuit, and the full-bridge inverter circuit includes an insulated gate bipolar transistor; the PWM circuit is connected to the insulated gate bipolar transistor, and the PWM circuit is used to control the conduction and cutoff of the insulated gate bipolar transistor to adjust the ultrasonic frequency and amplitude output by the output circuit.

[0012] On the other hand, an embodiment of the present application also provides an ultrasonic welding machine control method, which is used to control the ultrasonic welding machine control system described in any of the foregoing items, including: obtaining a first pressure borne by the workpiece to be welded and a first electrical signal of the output circuit; adjusting the input electrical signal and adjusting the opening of the air pressure proportional valve according to the first pressure and the first electrical signal, so that the input electrical signal remains at a constant value and the opening remains at a constant value.

[0013] Furthermore, in an embodiment of the present application, the step of adjusting the input electrical signal and adjusting the opening of the air pressure proportional valve according to the first pressure and the first electrical signal so that the input electrical signal is a constant value and the opening is a constant value specifically includes: determining that the first pressure is greater than a first threshold value or the first pressure is less than a second threshold value, and adjusting the opening of the air pressure proportional valve so that the opening remains at a constant value; determining that the first electrical signal is greater than a third threshold value or the first electrical signal is less than a fourth threshold value, and adjusting the input electrical signal so that the input electrical signal remains at a constant value.

[0014] Furthermore, in an embodiment of the present application, the control method also includes: obtaining a first temperature of a heat sink of an output circuit; determining that the first pressure is greater than a fifth threshold, or the first electrical signal is greater than a sixth threshold, or the first temperature is greater than a seventh threshold, and adjusting the input electrical signal to 0 to stop the ultrasonic welding machine from working.

[0015] On the other hand, an embodiment of the present application also provides a welding device, comprising an ultrasonic welding machine control system and a power supply module as described in any of the above items.

[0016] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application:

[0017] The present application can dynamically detect the first pressure borne by the welded workpiece and the first electrical signal of the output circuit at any time, and dynamically adjust the electrical signal input to the ultrasonic welding machine and the opening of the air pressure proportional valve according to the first pressure and the first electrical signal, so that the ultrasonic welding machine forms a closed-loop control, so that the input signal of the ultrasonic welding machine and the opening of the air pressure proportional valve are maintained at a constant value. The present application welds the welding workpiece with a constant input electrical signal and the opening of the air pressure proportional valve, which can maintain the stability of the ultrasonic welding power and welding pressure during welding, and can improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an application scenario of an ultrasonic welding machine control system in a specific embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the module structure of an ultrasonic welding machine control system in a specific embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of an output circuit in a specific embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the steps of an ultrasonic welding machine control method in a specific embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of an ultrasonic welding machine control system in a specific embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of an application scenario of an ultrasonic welding machine control system in another specific embodiment of the present invention. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings to illustrate the principles and processes of the ultrasonic welding machine control system, system, device and storage medium in the embodiments of the present invention.

[0025] Reference Figure 1 The present invention can provide an ultrasonic welding machine control system. Figure 1 The control system 1 can be connected to the output circuit 2, and the control system 1 can be connected to the ultrasonic welding machine 3. The ultrasonic welding machine can include a pneumatic proportional valve 31, and the pneumatic proportional valve 31 can control the pressure of the workpiece during welding. The control system 1 can be used to control the input electrical signal of the ultrasonic welding machine 3 and the pneumatic proportional valve 31.

[0026] It should be noted that in this embodiment, the connection between the control system and the ultrasonic welding machine can be a signal connection or a direct connection through an electrical line. Similarly, the connection between the control system and the output circuit can be a direct connection through an electrical line. It should be noted that the signal connection method may include but is not limited to 3G / 4G / 5G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (Ultra Wide Band) connection and other wireless connection methods currently known or to be developed in the future. Among them, WiMax (Worldwide Interoperability for Microwave Access) is global microwave interconnection access, and ZigBee is a low-power LAN protocol based on the IEEE802.15.4 standard, and UWB (ultra wide band) is a low-power radio technology used in the field of wireless communications.

[0027] Among them, refer to Figure 2, the control system may include a first detection module 11, a second detection module 12 and a control module 13. The first detection module 11 and the second detection module 12 may be connected to the control module 13. The first detection module 11 is used to detect the first pressure borne by the welded workpiece and transmit it to the control module 13. The second detection module 12 may detect the first electrical signal of the output circuit and send it to the control module 13. The control module 13 may receive the first electrical signal and the first pressure and may dynamically adjust the input electrical signal and the opening of the air pressure proportional valve according to the first pressure and the first electrical signal, so that the input electrical signal remains at a constant value and the opening remains at a constant value.

[0028] It is understandable that the first detection module may be a device or apparatus for detecting pressure, such as a pressure sensor and a device integrating a pressure sensor and other electronic components through integration technology. The second detection module is a device or apparatus for detecting an electrical signal, wherein the electrical signal may include one or more combined parameters of voltage, current or frequency.

[0029] In the embodiment of the present application, the first pressure is the pressure value that the workpiece is subjected to at a certain moment, and the first electrical signal is the output electrical signal of the output circuit. Since the welding process is a long process, during this process, the first pressure may change due to different welding positions and welding structures. The first electrical signal may fluctuate due to the temperature of the circuit components and other circuit factors. When pressure changes and electrical signal changes occur, the control module of the present application can adjust the output of the circuit to keep the input electrical signal at a constant value and the opening at a constant value.

[0030] It should be noted that the constant value of the present application is a parameter of any numerical value, and the constant value can be adjusted according to the shape and structure of different workpieces. For example, if workpiece A is larger in shape than workpiece B, the pressure value that A can withstand is larger than that of B. Correspondingly, when welding A, the opening can be adjusted to X1 and the input voltage can be adjusted to X2, and when welding B, the opening can be adjusted to Y1 and the input voltage can be adjusted to Y2. The constant value is a value that indicates that the input electrical signal of the ultrasonic welding machine remains in a certain state, or a value that indicates that the opening of the air pressure proportional valve remains in a certain state.

[0031] It is understandable that the embodiment of the present application can detect the pressure of the welded workpiece and the electrical signal of the output circuit in real time at any time, and adjust the electrical signal input to the ultrasonic welding machine and the opening of the air pressure proportional valve in real time according to the pressure and the electrical signal, so that the ultrasonic welding machine forms a closed-loop control, so that the input signal of the ultrasonic welding machine and the opening of the air pressure proportional valve are maintained at a constant value. The present application welds the welding workpiece with a constant input electrical signal and the opening of the air pressure proportional valve. Compared with the traditional open-loop control, the present application can maintain the stability of the ultrasonic welding power and welding pressure during welding, which can improve the welding quality.

[0032] Furthermore, in some feasible embodiments, since the output circuit can be connected to the mains or a voltage of 380V, the output circuit needs to include a large number of high-power devices, each of which may include a heat sink, and the ultrasonic welding machine control system may also include a third detection module; the third detection module may detect the temperature of the heat sink.

[0033] It should be noted that the first temperature of the present application may be the temperature of the heat sink detected in real time. During real-time detection, a temperature sensor may be set on the heat sink, and the data of the temperature sensor may be collected by the processor to realize temperature collection. The heat sink of the present application may be a heat sink corresponding to several specific devices, such as some high-power devices set in a power factor correction circuit or a heat sink corresponding to a high-power device of a full-bridge inverter circuit, such as a heat sink corresponding to an insulated gate bipolar transistor of a full-bridge inverter circuit.

[0034] It can be understood that the embodiment of the present application can detect the temperature of the output circuit in real time by setting up the third detection module, and the output circuit can be further controlled by the temperature, which can improve the welding quality and the safety of the welding circuit.

[0035] Furthermore, in some feasible embodiments, the control system may include a driving circuit and an analysis circuit; the analysis circuit may be connected to the driving circuit, the first detection module, the second detection module, and the third detection module; the first detection module may detect the pressure borne by the welded workpiece, and the second detection module may detect the electrical signal of the output circuit. After obtaining the pressure signal and the electrical signal, the analysis circuit may compare the pressure signal and the electrical signal with the corresponding process parameters in the preset expert database, obtain the comparison results and form different control signals to be sent to the driving circuit. The driving circuit may adjust the input electrical signal and the opening of the air pressure proportional valve according to different control signals.

[0036] It should be noted that the analysis circuit of the embodiment of the present application may include a single chip microcomputer and its peripheral circuits, an FPGA or PLC control chip and its corresponding peripheral circuits. The pressure signal and the electrical signal are converted into a control signal of the drive circuit by the internal processor of the control chip, and the drive circuit can control the output of the output circuit and the opening of the air pressure proportional valve through the control signal.

[0037] Furthermore, in some feasible embodiments, the control module may also include a protection circuit. The protection circuit may be connected to the drive circuit; the protection circuit may generate a second control signal according to the pressure of the welded workpiece, the electrical signal of the output circuit, and the temperature of the heat sink, and send the second control signal to the drive circuit; the drive circuit may adjust the input electrical signal to 0 according to the received second control signal.

[0038] It should be noted that the control module adjusts the input electrical signal to 0, that is, adjusts the output of the output circuit to 0. When the pressure on the workpiece being welded, the electrical signal of the output circuit, or the temperature of the radiator is greater than a certain range, the circuit may be overloaded or abnormally heated or have other faults. The protection circuit can generate a second control signal to control the output of the output circuit to 0. At this time, the input voltage of the ultrasonic welding machine is also 0, and the welding machine stops working to avoid damage to the welding machine.

[0039] It can be understood that, by providing a protection circuit, the embodiment of the present application can reduce the working time of the welding machine under abnormal circuit conditions, increase the service life of the welding machine, improve the welding quality and save costs.

[0040] Further, in some feasible embodiments, referring to Figure 3 The output circuit may include a rectifier filter circuit 21, a power factor correction circuit 22, a full-bridge inverter circuit 23, a boost circuit 24, and a filter circuit 25. The power factor correction circuit 22 may be connected to the rectifier filter circuit 21 and the full-bridge inverter circuit 23. The boost circuit 24 may be connected to the full-bridge inverter circuit 23 and the filter circuit 25. The filter circuit 25 may be connected to the ultrasonic welding machine.

[0041] In the embodiment of the present application, the external input electrical parameters of 380V 50Hz or 60Hz are converted into direct current through a rectifier and filter circuit; the direct current obtains a corrected direct current voltage through a power factor correction circuit, and the corrected direct current voltage is converted into an ultrasonic frequency pulse through a full-bridge inverter circuit. The ultrasonic frequency pulse is regulated by a boost circuit, and under the control of the ultrasonic frequency pulse, the voltage is increased to the voltage required by the transducer by a high-frequency transformer, and the boost circuit has an impedance matching function; the voltage required by the transducer is filtered by the LC filter of the filter circuit, and the high-voltage pulse is filtered out to produce a sine wave that can be input into the ultrasonic welding machine.

[0042] It should be noted that in the embodiment of the present application, the specific value of the DC power with a certain threshold output by the rectifier and filter circuit can be adjusted according to different component configurations, and the specific value of the voltage required by the transducer obtained by the boost circuit can also be adjusted according to the required voltage of different transducers.

[0043] Further, in some feasible embodiments, the driving circuit may include a PWM circuit. The output circuit may include a full-bridge inverter circuit, and the full-bridge inverter circuit may include an insulated gate bipolar transistor. The PWM circuit is connected to the insulated gate bipolar transistor, and the PWM circuit is used to control the conduction and cutoff of the insulated gate bipolar transistor to adjust the ultrasonic frequency and amplitude output by the output circuit.

[0044] It should be noted that the PWM circuit can control the conduction and cutoff of the insulated gate bipolar transistor by outputting a periodic PWM wave, so that the output circuit outputs ultrasonic waves with a certain frequency and amplitude. The ultrasonic waves can be used as the input electrical signal of the ultrasonic welding machine to control the welding power of the ultrasonic welding machine.

[0045] It can be understood that the embodiment of the present application can accurately control the conduction and cutoff of the insulated gate bipolar transistor through the PWM circuit, so that the output signal of the output circuit can be changed in time, thereby improving the control accuracy of the ultrasonic welding machine of the present application and improving the quality of the welded workpiece.

[0046] In addition, refer to Figure 4 ,and Figure 1 Corresponding to the system, an ultrasonic welding machine control method is also provided in an embodiment of the present application. The control method can be used to control the above ultrasonic welding machine control system. The control method may include but is not limited to step S1 and step S2:

[0047] S1. Acquire in real time a first pressure borne by a workpiece to be welded and a first electrical signal of an output circuit.

[0048] In the embodiment of the present application, the pressure on the welding workpiece and the output circuit electrical signal can be collected by the first detection module and the second detection module of the control system; the first detection module can be a pressure sensor. The electrical parameters can include but are not limited to voltage, current and frequency, and the second detection module can be a device with voltage, current or frequency detection function or a device integrating a device and a chip.

[0049] It should be noted that the piezoelectric pressure sensor of the embodiment of the present application may include but is not limited to one or more combinations of piezoelectric pressure sensors, piezoresistive pressure sensors, capacitive pressure sensors, electromagnetic pressure sensors and inductive pressure sensors, and the number of pressure sensors of the embodiment of the present application may be one or more. When multiple sensors are used to detect the pressure of the welded workpiece, an average value or weighted value can be calculated by a weighted algorithm or an average algorithm as the final real-time detected pressure of the welded workpiece. Similarly, the number of the second detection modules of the embodiment of the present application may be one or more. When the second detection module is used to detect the electrical signal of the output circuit, an average value or weighted value can be calculated by a weighted algorithm or an average algorithm as the final real-time detected electrical signal of the output circuit. The embodiment of the present application further calculates the detection data of multiple detection devices by setting an algorithm, so as to obtain more accurate data and improve the control accuracy of the ultrasonic welding machine control system.

[0050] S2. According to the first pressure and the first electrical signal, adjust the input electrical signal and the opening of the air pressure proportional valve in real time to keep the input electrical signal and the opening at a constant value.

[0051] It is understandable that in the embodiment of the present application, the first pressure can be the pressure borne by the welded workpiece, and during the welding process, due to the influence of factors such as the environment and process, the pressure borne by the welded workpiece may change at any time. The first electrical signal can be an electrical signal of the output circuit, and during the welding process, due to the influence of factors such as the circuit structure, environment and process, the electrical signal of the output circuit may change at any time. Since the welding machine is directly connected to the output circuit, the output electrical signal of the output circuit can be used as the input electrical signal of the welding machine. According to the changed pressure borne by the welded workpiece and the changed electrical signal of the output circuit, the control module or controller can adjust the input electrical signal of the welding machine and adjust the opening of the gas pressure proportional valve in real time to keep the input electrical signal at a constant value and the opening at a constant value.

[0052] Further, in some feasible embodiments, the step of adjusting the input electrical signal and adjusting the opening of the air pressure proportional valve in real time according to the first pressure and the first electrical signal so that the input electrical signal and the opening are constant values ​​may include but is not limited to step S21 and step S22:

[0053] S21. Determine that the first pressure is greater than a first threshold value or the first pressure is less than a second threshold value, and adjust the opening of the air pressure proportional valve in real time to keep the opening at a constant value.

[0054] In the embodiment of the present application, the first threshold value may be the upper limit value of the pressure borne by the welded workpiece, and the second threshold value may be the lower limit value of the pressure borne by the welded workpiece. Due to the influence of process, environment and equipment factors, the pressure borne by the welded workpiece will fluctuate to a certain extent. In the embodiment of the present application, by setting the upper limit value and the lower limit value of the pressure, when the pressure borne by the welded workpiece is greater than the upper limit first threshold value or less than the lower limit second threshold value, the opening of the air pressure proportional valve can be adjusted in real time to keep the opening at a constant value.

[0055] It should be noted that the first threshold and the second threshold in the embodiment of the present application can be adjusted according to factors such as different workpieces and welding positions, and the specific values ​​are not limited here.

[0056] S22: Determine that the first electrical signal is greater than the third threshold or the first electrical signal is less than the fourth threshold, and adjust the input electrical signal in real time to keep the input electrical signal at a constant value.

[0057] In an embodiment of the present application, the third threshold value may be the upper limit value of the electrical signal of the output circuit, and the second threshold value may be the lower limit value of the first electrical signal of the output circuit. Due to the influence of circuit structure, process, environment and equipment factors, the electrical signal of the output circuit may fluctuate to a certain extent during welding. In an embodiment of the present application, by setting the upper limit value and the lower limit value of the electrical signal, when the first electrical signal of the output circuit is greater than the third threshold value of the upper limit or less than the fourth threshold value of the lower limit, the frequency and pulse width value of the PWM signal inside the circuit can be output in real time, so that the input electrical signal of the ultrasonic welding is kept at a constant value.

[0058] It should be noted that the third threshold and the fourth threshold in the embodiment of the present application can be adjusted according to different workpieces, welding positions and other factors, and the specific values ​​are not limited here.

[0059] Furthermore, in some feasible embodiments, the control method may also include but is not limited to step S23 and step S24.

[0060] S23, obtaining a first temperature of a heat sink of an output circuit;

[0061] In the embodiment of the present application, the first temperature can be used to characterize the temperature of the radiator, and the radiator temperature can also characterize whether an abnormality occurs in the output circuit. The present application can set a temperature sensor on the radiator, collect the temperature of the radiator through the temperature sensor, and adjust the input electrical signal of the ultrasonic welding machine according to different radiator temperatures.

[0062] S24, determining that the first pressure is greater than the fifth threshold, or the first electrical signal is greater than the sixth threshold, or the first temperature is greater than the seventh threshold, and adjusting the input electrical signal to 0 to stop the ultrasonic welding machine from working.

[0063] In an embodiment of the present application, the fifth threshold value may be an abnormal pressure value indicating an abnormality in the control system, the sixth threshold value may be a value corresponding to an abnormal electrical signal indicating an abnormality in the control system, and the seventh threshold value may be an abnormal temperature value indicating an abnormality in the control system. When the pressure on the workpiece being welded detected in real time is greater than the abnormal pressure value indicating an abnormality in the control system, or the electrical signal of the output circuit is detected to be greater than the value corresponding to the abnormal electrical signal of the control system, or the temperature value of the output circuit is detected to be greater than the abnormal temperature value indicating an abnormality in the control system, the input electrical signal may be adjusted to 0 to stop the ultrasonic welding machine from working. The specific adjustment method may be to control the output signal of the driving circuit to be low level through the control module, and the low level may cut off the switching device in the output circuit, thereby making the output circuit inoperative.

[0064] The control method of the present application is described below with reference to specific embodiments.

[0065] In the embodiment of the present application, the first threshold is A1, the second threshold is A2, the third threshold is B1, the fourth threshold is B2, the fifth threshold is A3, the sixth threshold is B3, and the seventh threshold is T. The constant value of the opening is A, and the constant value of the opening is the constant value of the input electrical signal B. The electrical signal includes electrical parameters (current or voltage) and frequency, and the first detection module is a pressure sensor.

[0066] Reference Figure 6 The output circuit of the embodiment of the present application and the control module capable of analyzing the pressure of the welded workpiece are integrated into an ultrasonic power source. The ultrasonic welder is provided with a pressure sensor and a pressure proportional valve.

[0067] The ultrasonic welding machine control system of the present application embodiment can refer to Figure 5 ,exist Figure 5In the embodiment, the output circuit may include a rectifier filter circuit, a power factor correction circuit, a full-bridge inverter circuit, a transformer boost circuit, and an LC filter circuit, and the output circuit is connected to the ultrasonic welding machine through the output end of the LC filter circuit, and the ultrasonic welding machine is provided with a pneumatic proportional valve and a pressure sensor. The control module may include a signal detection circuit, a protection circuit, a drive circuit, and an MCU control circuit. Specifically, the output circuit may convert the 380V 50Hz or 60Hz input of the mains into a direct current with a certain voltage through a rectifier filter circuit, a power factor correction circuit, a full-bridge inverter circuit, a transformer boost circuit, and an LC filter circuit. The power factor correction circuit corrects the direct current with a certain voltage to obtain the corrected direct current. The full-bridge inverter circuit can convert the corrected direct current into an ultrasonic frequency pulse; the transformer boost circuit, under the control of the ultrasonic frequency pulse, uses a high-frequency transformer to increase the voltage required by the transducer, and at the same time has the function of impedance matching; the LC filter circuit filters out a sine wave from the high-voltage pulse, and the sine wave can be used to drive the ultrasonic welding machine to weld the workpiece to be welded.

[0068] During the welding process of the workpiece, when the pressure sensor detects in real time that the pressure of the welded workpiece is greater than A1, the control module can reduce the opening of the air pressure proportional valve in real time to keep the opening at A. When the pressure sensor detects in real time that the pressure of the welded workpiece is less than A2, the control can increase the opening of the air pressure proportional valve in real time to keep the opening at A. The constant opening A can keep the pressure of the welded workpiece at a fixed pressure. During the welding process of the workpiece, when the real-time detection output circuit electrical signal is greater than B1, the control module can control the conduction and cutoff of the insulated gate bipolar transistor through the PWM circuit to adjust the ultrasonic frequency and amplitude output by the output circuit, reduce the frequency and amplitude of the electrical signal of the output circuit in real time, and reduce the input electrical signal connected to the ultrasonic welding machine to B. When the real-time detection output circuit electrical signal is less than B2, the frequency and amplitude of the electrical signal of the output circuit can be increased in real time, so that the input electrical signal connected to the ultrasonic welding machine rises to B, so that the welding power of the ultrasonic welding machine remains constant to improve the welding quality.

[0069] When the fifth threshold value is A3, the sixth threshold value is B3, and the seventh threshold value is T, the real-time detection shows that the pressure borne by the workpiece being welded is greater than A3, or the real-time output electrical signal of the output circuit is greater than B3, or the temperature of the radiator is greater than T, the control circuit can control the cutoff of the insulated gate bipolar transistor through the PWM circuit to adjust the input electrical signal of the ultrasonic welding machine to 0, so that the ultrasonic welding machine stops working.

[0070] and Figure 2 Corresponding to the system, an embodiment of the present application further provides a welding device, which may include the ultrasonic welding machine control system and power supply module described above.

[0071] It should be noted that in the embodiment of the present application, the power module can be a module that outputs alternating current with an amplitude of 380V and a frequency of 50Hz or 60Hz. The power module can be an output device that outputs a voltage of 380V with a frequency of 50Hz or 60Hz, or a device that outputs a voltage of 380V with a frequency of 50Hz or 60Hz.

[0072] The contents of the above control system embodiments are all applicable to the present welding equipment. The functions specifically implemented by the present welding equipment embodiments are the same as those of the above control system embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0073] In some optional embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the application is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Optional embodiments are expected, wherein the order of various operations is changed and the sub-operation described as a part of a larger operation is performed independently.

[0074] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present application. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional techniques of the engineer. Therefore, those skilled in the art can implement the present application set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the attached claims and their equivalents.

[0075] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0076] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may be embodied in any computer-readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0077] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0078] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0080] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments. Technical personnel familiar with the field may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. An ultrasonic welding machine control system, characterized in that: The control system is connected to the output circuit, and the control system is connected to the ultrasonic welding machine; the control system is used to control the input electrical signal and the air pressure proportional valve of the ultrasonic welding machine, and the control system includes: A first detection module, used for detecting a first pressure borne by the welded workpiece; A second detection module, used to detect the first electrical signal of the output circuit; A control module is used to dynamically adjust the input electrical signal and the opening of the air pressure proportional valve according to the first pressure and the first electrical signal, so that the input electrical signal remains at a constant value and the opening remains at a constant value.

2. According to claim 1, an ultrasonic welding machine control system is characterized in that: The output circuit includes a radiator, and the ultrasonic welding machine control system also includes a third detection module; the third detection module is used to detect the first temperature of the radiator.

3. According to claim 2, an ultrasonic welding machine control system is characterized in that: The control module includes a driving circuit and an analysis circuit; the analysis circuit is connected to the driving circuit, the first detection module, the second detection module and the third detection module; the analysis circuit is used to generate a first control signal according to the first pressure, the first electrical signal and the first temperature, and the driving circuit is used to adjust the input electrical signal and adjust the opening of the air pressure proportional valve according to the first control signal.

4. According to claim 3, an ultrasonic welding machine control system is characterized in that: The control module also includes a protection circuit, which is connected to the drive circuit; the protection circuit is used to generate a second control signal according to the first pressure, the first electrical signal and the first temperature; the drive circuit is also used to adjust the input electrical signal to 0 according to the second control signal.

5. The ultrasonic welding machine control system according to claim 1, characterized in that: The output circuit includes a rectifier and filter circuit, a power factor correction circuit, a full-bridge inverter circuit, a boost circuit and a filter circuit; the power factor correction circuit is connected to the rectifier and filter circuit and the full-bridge inverter circuit; the boost circuit is connected to the full-bridge inverter circuit and the filter circuit, and the filter circuit is connected to the ultrasonic welding machine.

6. The ultrasonic welding machine control system according to claim 3, characterized in that: The driving circuit includes a PWM circuit, the output circuit includes a full-bridge inverter circuit, and the full-bridge inverter circuit includes an insulated gate bipolar transistor; the PWM circuit is connected to the insulated gate bipolar transistor, and the PWM circuit is used to control the conduction and cutoff of the insulated gate bipolar transistor to adjust the ultrasonic frequency and amplitude output by the output circuit.

7. A method for controlling an ultrasonic welding machine, characterized in that: A control system for controlling an ultrasonic welding machine according to any one of claims 1 to 6, comprising: Acquire a first pressure borne by the welded workpiece and a first electrical signal of an output circuit; The input electrical signal and the opening of the air pressure proportional valve are adjusted according to the first pressure and the first electrical signal, so that the input electrical signal and the opening are kept at a constant value.

8. The ultrasonic welding machine control method according to claim 7, characterized in that: The step of adjusting the input electrical signal and the opening of the air pressure proportional valve in real time according to the first pressure and the first electrical signal so that the input electrical signal and the opening are constant values ​​specifically includes: Determining that the first pressure is greater than a first threshold or the first pressure is less than a second threshold, and adjusting the opening of the air pressure proportional valve so that the opening is maintained at a constant value; It is determined that the first electrical signal is greater than a third threshold or the first electrical signal is less than a fourth threshold, and the input electrical signal is adjusted so that the input electrical signal remains at a constant value.

9. The ultrasonic welding machine control method according to claim 7, characterized in that: The control method also includes: obtaining a first temperature of a heat sink of an output circuit; determining that the first pressure is greater than a fifth threshold, or the first electrical signal is greater than a sixth threshold, or the first temperature is greater than a seventh threshold, and adjusting the input electrical signal to 0 to stop the ultrasonic welding machine from working.

10. A welding device, characterized in that: It comprises an ultrasonic welding machine control system and a power supply module as described in any one of claims 1 to 6.

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