Ultrasonic welding device, method for controlling the closing thereof, and computer-readable storage medium

Abstract

The application provides an ultrasonic welding device and a closing control method thereof and a computer readable storage medium, the method is applied to the ultrasonic welding device, wherein an IGBT tube is connected to an ultrasonic welding circuit, the method comprises the following steps: outputting a first periodic signal to the IGBT tube, the first periodic signal comprising a first high-level signal and a first low-level signal; receiving a closing ultrasonic welding device instruction; outputting a plurality of second periodic signals to the IGBT tube within a preset time, the duration of the second periodic signal being less than the duration of the first periodic signal, in any two adjacent second periodic signals, the duration of the second periodic signal outputted later is less than the duration of the second periodic signal outputted earlier; and stopping the output of signals to the IGBT tube after the preset time, and closing the ultrasonic welding device. When the ultrasonic welding device needs to be closed, the application slowly reduces the electric quantity stored by the internal capacitor of the ultrasonic welding device, thereby prolonging the service life of the device.

Description

Technical Field

[0001] This invention relates to the technical field of ultrasonic welding, specifically to an ultrasonic welding apparatus, a shut-off control method for the ultrasonic welding apparatus using the ultrasonic welding apparatus, and a computer-readable storage medium. Background Technology

[0002] During the use of high-power ultrasonic welding equipment, when the power supply to the ultrasonic welding equipment is stopped, due to its high rated power, the energy stored in the energy storage capacitor cannot be completely released instantaneously at the moment the power supply stops. This residual energy is released momentarily at the moment the power supply stops, directly causing a sudden increase in the output power and vibration amplitude of the ultrasonic welding equipment at the moment the wave stops. This instantaneous change in power and amplitude not only affects processing accuracy and generates noise, affecting the operator's experience, but may also accelerate the wear and tear of internal circuit components, shortening the equipment's lifespan.

[0003] An existing ultrasonic power supply circuit includes a rectifier and filter circuit, a power factor correction circuit, a phase-shifted full-bridge circuit, a capacitor and inductor circuit, a transformer isolation circuit, a filter capacitor, and an output load connected in sequence. The capacitor and inductor circuit forms a bandpass filter for the required ultrasonic frequency. The filter inductor is placed on the primary winding of the transformer in the transformer isolation circuit, and the secondary winding of the transformer can be directly connected to the two ends of the transducer. After the ultrasonic stop command is issued, the decaying oscillation of the remaining energy stored in the inductor and capacitor of the LLCCL circuit cannot reach the set frequency again, and therefore cannot be transmitted to the welding head. However, this solution requires four IGBTs to be turned on at zero voltage and turned off at zero current to filter out the high-frequency and low-frequency components in the square wave output by the phase-shifted full-bridge circuit. This uses too many IGBTs, wasting components and increasing component costs. Summary of the Invention

[0004] The first objective of this invention is to provide a shutdown control method for an ultrasonic welding device that reduces the impact of residual electrical energy on the ultrasonic welding device and reduces the use of components.

[0005] A second objective of the present invention is to provide an ultrasonic welding apparatus that uses a shut-off control method for an ultrasonic welding apparatus.

[0006] A third object of the present invention is to provide a computer-readable storage medium for a shut-off control method using an ultrasonic welding apparatus.

[0007] To achieve the first objective of this invention, the present invention provides a shut-off control method for an ultrasonic welding device. This method is applied to an ultrasonic welding device, wherein the ultrasonic welding device has a controller and an IGBT transistor. The controller is connected to the base of the IGBT transistor, and the IGBT transistor is also connected to an ultrasonic welding circuit. The method includes: outputting a first periodic signal to the IGBT transistor, the first periodic signal including a first high-level signal and a first low-level signal, the duration of the first high-level signal being the same as the duration of the first low-level signal; receiving a shutdown command for the ultrasonic welding device; outputting multiple second periodic signals to the IGBT transistor within a preset time, the duration of the second periodic signals being less than the duration of the first periodic signals, and in any two adjacent second periodic signals, the duration of the later output second periodic signal being less than the duration of the earlier output second periodic signal; and after the preset time, stopping the output of signals to the IGBT transistor and shutting down the ultrasonic welding device.

[0008] As can be seen from the above scheme, the longer the conduction time of the IGBT, the greater the current flowing through the connected circuit. When the IGBT operates with the first cycle signal, the current flowing through the ultrasonic welding device circuit can support the normal operation of the ultrasonic welding device. When a shutdown command is received, it operates with the second cycle signal. The duration of the second cycle signal is shorter than that of the first cycle signal, so the current flowing through the ultrasonic welding circuit is less than the current during operation. Within a preset time, the duration of the second cycle signal gradually decreases, causing the current flowing through the ultrasonic welding circuit to gradually decrease, thus reducing the voltage output. The charge stored in the capacitor is directly related to the voltage across the capacitor. When the voltage of the ultrasonic welding circuit decreases, the voltage stored in the capacitor decreases along with the voltage output of the circuit. When the ultrasonic welding device is completely shut down after the preset time, the charge stored in the capacitor has gradually decreased to near zero. Therefore, the output power and vibration amplitude of the ultrasonic welding device are essentially zero, protecting the ultrasonic welding device and extending its service life. Furthermore, this invention uses only one IGBT, reducing the number of components.

[0009] In a further scheme, the duration of multiple second-cycle signals output sequentially along the time axis decreases in a linearly decreasing manner.

[0010] Therefore, by decreasing the capacitance linearly, the amount of charge stored in the capacitor decreases linearly, allowing the charge to be released gradually. This prevents the ultrasonic welding circuit from experiencing an increase in output power and vibration amplitude due to a sudden release of charge from the capacitor, thus extending the service life of the ultrasonic welding device.

[0011] In a further embodiment, each second cycle signal includes a second high-level signal and a second low-level signal.

[0012] In a further embodiment, the duration of each second high-level signal is equal to the duration of the corresponding second low-level signal.

[0013] Therefore, by setting the same duration, the ultrasonic welding circuit can obtain a balanced preparation time, thereby enhancing system stability.

[0014] In a further embodiment, the time difference between the duration of the second cycle signal output in the subsequent output and the duration of the second cycle signal output in the previous output is a first preset value.

[0015] Therefore, by setting the time difference to the first preset value, the conduction time of the IGBT tube is gradually reduced, the current of the ultrasonic welding circuit is gradually reduced, the voltage across the capacitor is gradually reduced, and the charge of the capacitor is gradually reduced, thus preventing the output power and vibration amplitude from increasing instantaneously at the moment of wave cessation.

[0016] In a further embodiment, the collector of the IGBT is connected to the first terminal of the ultrasonic welding circuit, and the emitter of the IGBT is connected to the second terminal of the ultrasonic welding circuit.

[0017] Therefore, by connecting the two ends of the ultrasonic welding circuit with an IGBT, the on / off state of the ultrasonic welding circuit can be controlled, thereby controlling the magnitude of the ultrasonic welding circuit current.

[0018] To achieve the second objective, the present invention provides an ultrasonic welding apparatus comprising an ultrasonic welding circuit, an IGBT tube, a controller, and a memory. The IGBT tube is connected to the ultrasonic welding circuit, the controller is connected to the IGBT tube, and the memory stores a computer program. When the computer program is executed by the controller, it implements the aforementioned method for shutting down the ultrasonic welding apparatus.

[0019] To achieve the third objective, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the above-described method for controlling the shutdown of the ultrasonic welding apparatus. Attached Figure Description

[0020] Figure 1 This is a system structure block diagram of an embodiment of the ultrasonic welding device of the present invention.

[0021] Figure 2 This is a flowchart of an embodiment of the shut-off control method for the ultrasonic welding apparatus of the present invention.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0023] The present invention provides a method for shutting down an ultrasonic welding device. When the ultrasonic welding device is operating, a first-cycle signal is output to the IGBT transistor to control its operation. At this time, the ultrasonic welding device operates with a first current and a first voltage. When a shutdown command is received, multiple second-cycle signals are output to the IGBT transistor, with the duration of each second-cycle signal gradually decreasing. This causes a gradual decrease in the current flowing through the ultrasonic welding circuit, resulting in a gradual decrease in the voltage across the ultrasonic welding circuit. Consequently, the amount of charge stored in the capacitor gradually decreases. When the ultrasonic welding device is completely shut down, the capacitor has almost no residual energy, reducing the wear and tear on the device's circuit components and extending its service life.

[0024] Example of an ultrasonic welding device: See Figure 1 The ultrasonic welding device of this embodiment includes a controller 13, a memory 14, an IGBT 11, and an ultrasonic welding circuit 12. The controller 13 is connected to the memory 14 and to the base of the IGBT 11. The collector of the IGBT 11 is connected to the first terminal of the ultrasonic welding circuit 12, and the emitter of the IGBT 11 is connected to the second terminal of the ultrasonic welding circuit 12. A capacitor is provided in the ultrasonic welding circuit 12 to store electrical charge. The controller 13 outputs a periodic signal to control the on and off states of the IGBT 11. The on and off states of the IGBT 11 control the operation of the ultrasonic welding device, thereby controlling the magnitude of the current conducted by the ultrasonic welding circuit and thus controlling the amount of electrical charge stored in the capacitor.

[0025] The memory 14 stores a computer program, which, when executed by the controller 13, implements the ultrasonic welding device shutdown control method described in the embodiment.

[0026] Example of a method for controlling the shutdown of an ultrasonic welding device: The shutdown control method of the ultrasonic welding device in this embodiment is executed by the ultrasonic welding device of the above embodiment. When the ultrasonic welding device is working, it first executes step S1, outputting a first cycle signal to the IGBT transistor. The first cycle signal includes a first high-level signal and a first low-level signal, and the duration of the first high-level signal is the same as the duration of the first low-level signal. At this time, the ultrasonic welding device operates with a first current and a first voltage.

[0027] When the user outputs a shutdown command to the controller via a button, step S2 is executed, and the controller receives the command to shut down the ultrasonic welding device. Upon receiving the shutdown command, the power supply to the ultrasonic welding device is not immediately stopped. This is to prevent the electrical energy stored in the capacitors of the ultrasonic welding circuit from being released instantaneously at the moment the power supply stops, which would cause a sudden increase in output power and vibration amplitude.

[0028] After receiving the command to shut down the ultrasonic welding device, the controller executes step S3, outputting multiple second-cycle signals to the IGBT transistor within a preset time. The duration of the second-cycle signal is shorter than the duration of the first-cycle signal. Within the preset time, the current conducted by the ultrasonic welding circuit is less than the first current, thus reducing the current conducted by the ultrasonic welding circuit.

[0029] The duration of each second high-level signal is equal to the duration of the corresponding second low-level signal, which enables the ultrasonic welding circuit to obtain a balanced preparation time and enhances system stability.

[0030] Furthermore, in any two adjacent second-cycle signals, the duration of the later output second-cycle signal is shorter than the duration of the earlier output second-cycle signal. The durations of the multiple second-cycle signals output sequentially along the time axis decrease linearly. The time axis is a preset time axis. Specifically, the time difference between the duration of the first second-cycle signal output by the controller and the duration of the first cycle signal is a first preset value. Similarly, the time difference between the duration of the later output second-cycle signal and the duration of the earlier output second-cycle signal in any two adjacent second-cycle signals is also the first preset value. The duration of the last second-cycle signal output by the controller is the first preset value; that is, the difference between the duration of the last second-cycle signal and zero is the first preset value.

[0031] As the duration of the multiple second-cycle signals output sequentially along the time axis decreases linearly, the current flowing through the ultrasonic welding circuit also gradually decreases. Therefore, the voltage across the capacitor in the ultrasonic welding circuit also gradually decreases, and consequently, the amount of charge stored in the capacitor also gradually decreases. Because the duration of the multiple second-cycle signals decreases linearly, the amount of charge stored in the capacitor also decreases linearly. Therefore, the capacitor will not release its stored energy instantaneously. Instead, the energy stored in the capacitor decreases gradually until it is almost zero. Thus, when the power is cut off, the amount of charge released by the capacitor is almost zero. This prevents the output power and vibration amplitude of the ultrasonic welding device from increasing instantaneously at the moment of wave interruption, reducing noise output, protecting internal circuit components, and extending the equipment's lifespan.

[0032] Furthermore, the ultrasonic welding device in this embodiment only uses one IGBT tube to operate, and uses fewer components. Instead, it uses software to set a preset time to slowly reduce the amount of electricity stored in the capacitor, thereby reducing component costs.

[0033] Examples of computer-readable storage media: The ultrasonic welding apparatus shutdown control method described in the above embodiments can be stored as a computer program in a computer-readable storage medium. When this computer program is executed by a processor, it can complete the steps of the above embodiments of the ultrasonic welding apparatus shutdown control method in a computer device. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0034] The above are merely preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Without departing from the concept of the present invention, many other equivalent embodiments may be included. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present invention.

Claims

1. A shut-off control method for an ultrasonic welding apparatus, wherein the method is applied to an ultrasonic welding apparatus, wherein, The method of controlling the operation of an ultrasonic welding device using an IGBT tube includes: A first cycle signal is output to the IGBT transistor. The first cycle signal includes a first high-level signal and a first low-level signal. The duration of the first high-level signal is the same as the duration of the first low-level signal. Its features are: Receive command to shut down the ultrasonic welding device; Within a preset time period, multiple second-cycle signals are output to the IGBT transistor. The duration of the second-cycle signal is less than the duration of the first-cycle signal. In any two adjacent second-cycle signals, the duration of the later output second-cycle signal is less than the duration of the earlier output second-cycle signal. After the preset time, the signal output to the IGBT tube is stopped, and the ultrasonic welding device is turned off. The duration of the multiple second-cycle signals output sequentially along the time axis decreases in a linear decreasing manner, wherein the time axis is the time axis of the preset time; Each of the second cycle signals includes a second high-level signal and a second low-level signal; The duration of each of the second high-level signals is equal to the duration of the corresponding second low-level signal; The collector of the IGBT is connected to the first terminal of the ultrasonic welding circuit, and the emitter of the IGBT is connected to the second terminal of the ultrasonic welding circuit.

2. The shut-off control method for the ultrasonic welding device according to claim 1, characterized in that: The controller is connected to the base of the IGBT transistor.

3. An ultrasonic welding apparatus, comprising an ultrasonic welding circuit, an IGBT transistor, a controller, and a memory, wherein the IGBT transistor is connected to the ultrasonic welding circuit, and the controller is connected to the IGBT transistor, characterized in that: The memory stores a computer program, which, when executed by the controller, implements the shut-off control method of the ultrasonic welding apparatus according to any one of claims 1 to 2.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the shut-off control method of the ultrasonic welding apparatus according to any one of claims 1 to 2.

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