An ultrasonic signal generating circuit and a welding apparatus

Abstract

The application discloses an ultrasonic signal generating circuit and welding equipment, wherein the circuit comprises a signal generating module, a first signal processing module, a second signal processing module and an impedance matching and tuning module. The signal generating module is used for generating a first driving signal according to a control signal and performing first amplification on the first driving signal to obtain a second driving signal. The first signal processing module is used for performing amplitude adjustment on the second driving signal to generate a third driving signal. The second signal processing module is used for performing second amplification on the third driving signal to obtain a fourth driving signal. The impedance matching and tuning module is used for performing impedance matching and resonance adjustment on the fourth driving signal to obtain a sinusoidal ultrasonic signal. The method can improve the stability of processing quality. The application can be widely applied to the technical field of circuits.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to an ultrasonic signal generating circuit and welding equipment. Background Technology

[0002] In existing technologies, most ultrasonic generators employ a switching power supply topology. The switching power supply generates a pulse signal, which is then filtered to produce a power signal of a specific frequency. This power signal is further converted into an output signal that matches the ultrasonic transducer. Due to the signal conversion method of the switching power supply, some signals of other frequencies remain in the output signal after filtering, inevitably resulting in a small amount of DC and harmonic components. These DC and harmonic components can affect the quality of the ultrasonic frequency generated by the ultrasonic transducer. Therefore, a new ultrasonic signal generation circuit is urgently needed. Summary of the Invention

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

[0004] Therefore, one objective of the embodiments of this application is to provide an ultrasonic signal generating circuit and welding equipment, which can improve the stability of processing quality.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted in this application includes: an ultrasonic signal generating circuit, comprising a signal generating module for generating a first driving signal according to a control signal, and amplifying the first driving signal for the first time to obtain a second driving signal; a first signal processing module for adjusting the amplitude of the second driving signal to generate a third driving signal; a second signal processing module for amplifying the third driving signal for the second time to obtain a fourth driving signal; and an impedance matching and tuning module for performing impedance matching and resonance adjustment on the fourth driving signal to obtain a target ultrasonic signal; wherein the target ultrasonic signal is a sine wave.

[0006] In addition, the ultrasonic signal generating circuit according to the above embodiments of the present invention may also have the following additional technical features:

[0007] Further, in this embodiment, the signal generation module includes: a frequency tracking signal generation module and a first signal amplification module; the frequency tracking signal generation module is connected to the first signal amplification module; the frequency tracking signal generation module includes a crystal oscillator generator and a signal generation circuit; the crystal oscillator generator includes an active crystal oscillator and a first power supply; the first pin of the active crystal oscillator is left floating; the second pin of the active crystal oscillator is grounded; the third pin of the active crystal oscillator is connected to the signal generation circuit as an output terminal; the fourth pin of the active crystal oscillator is connected to the first power supply; the signal generation circuit includes a signal generation chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a thirteenth capacitor, and a seventh resistor; the second pin of the signal generation chip, one end of the ninth capacitor, and the... One end of the tenth capacitor and one end of the eleventh capacitor are connected to the first power supply; the other end of the eleventh capacitor is connected to the first pin of the signal generating chip; the other end of the ninth capacitor, the other end of the tenth capacitor, the fourth pin of the signal generating chip, and the ninth pin of the signal generating chip are grounded; one end of the thirteenth capacitor is connected to the third pin of the signal generating chip; the other end of the thirteenth capacitor is connected to the fourth pin of the signal generating chip; the sixth, seventh, and eighth pins of the signal generating chip are used to receive control signals; the tenth pin of the signal generating chip is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the first signal amplification module.

[0008] Further, in this embodiment, the first signal processing module includes: an amplitude adjustment circuit, an analog signal amplification module, and a multiplier circuit; the amplitude adjustment circuit is connected to the multiplier circuit; the analog signal amplification module is connected to the multiplier circuit; the amplitude adjustment circuit is used to adjust the second driving signal into a symmetrical signal with positive and negative symmetry centered at 0; the analog signal amplification module is used to amplify the amplitude-adjusting analog signal sent by the control system into a first analog signal; the multiplier circuit is used to obtain the third driving signal based on the symmetrical signal and the first analog signal.

[0009] Further, in this embodiment, the second signal processing module includes: a signal-level amplification module and a power-level amplification module; the signal-level amplification module is connected to the power-level amplification module; the signal-level amplification module includes a positive static power supply, a negative static power supply, a sixteenth resistor, a seventeenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-second capacitor, a twenty-fifth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a thirty-first capacitor, a second diode, a fourth diode, and a fourth operational amplifier; one end of the twentyth resistor is connected to the first signal processing module; the other end of the twentyth resistor, the anode of the second diode, and the cathode of the fourth diode are connected to one end of the twenty-seventh capacitor; the cathode of the second diode is connected to the positive static power supply; the anode of the fourth diode is connected to the negative static power supply; one end of the twenty-first resistor and one end of the twenty-eighth capacitor... One end of the 24th resistor is connected to the other end of the 27th capacitor; the other end of the 24th resistor and the other end of the 28th capacitor are grounded; the other end of the 21st resistor, one end of the 16th resistor, and one end of the 22nd capacitor are connected to the inverting input of the fourth operational amplifier; the other end of the 16th resistor is connected to one end of the 17th resistor; the other end of the 17th resistor and the other end of the 22nd capacitor are connected to the output of the fourth operational amplifier; one end of the 25th capacitor and the positive power supply terminal of the fourth operational amplifier are connected to the positive quiescent power supply; one end of the 31st capacitor and the negative power supply terminal of the fourth operational amplifier are connected to the negative quiescent power supply; the other end of the 25th capacitor, one end of the 25th resistor, and the other end of the 31st capacitor are grounded; the other end of the 25th resistor is connected to the non-inverting input of the fourth operational amplifier.

[0010] Furthermore, in this embodiment, the impedance matching and tuning module includes: an impedance matching module, a tuning module, a current sampling module, and a voltage sampling module; the tuning module, the current sampling module, and the voltage sampling module are connected to the impedance matching module; the impedance matching module is used to adjust the impedance of the ultrasonic signal generating circuit; the tuning module is used to adjust the resonance of the fourth driving signal so that the target ultrasonic signal is a sine wave.

[0011] Further, in this embodiment, the first signal amplification module includes: a first operational amplifier, a second resistor, a fourth resistor, a tenth resistor, a fifth capacitor, and a sixteenth capacitor; the other end of the seventh resistor, one end of the tenth resistor, and one end of the sixteenth capacitor are connected to the non-inverting input terminal of the first operational amplifier; the other end of the tenth resistor and the other end of the sixteenth capacitor are grounded; one end of the second resistor, one end of the fourth resistor, and one end of the fifth capacitor are connected to the inverting input terminal of the first operational amplifier; the other end of the second resistor is grounded; the other end of the fifth capacitor and the other end of the fourth resistor are connected to the output terminal of the first operational amplifier.

[0012] Further, in this embodiment, the amplitude adjustment circuit includes: a second power supply, a second operational amplifier, a third resistor, a fifth resistor, a sixth resistor, a ninth resistor, a fourth capacitor, and a fourteenth capacitor; one end of the sixth resistor, one end of the ninth resistor, and one end of the fourteenth capacitor are connected to the non-inverting input of the second operational amplifier; the other end of the sixth resistor is connected to the signal generation module; the other end of the ninth resistor and the other end of the fourteenth capacitor are grounded; one end of the fifth resistor, one end of the third resistor, and one end of the fourth capacitor are connected to the inverting input of the second operational amplifier; the other end of the fifth resistor is connected to the signal generation module. Two power supplies are connected; the other end of the third resistor and the other end of the fourth capacitor are connected to the output terminal of the second operational amplifier; the output terminal of the second operational amplifier is connected to the multiplier circuit; the analog signal amplification module includes a third operational amplifier, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a seventeenth capacitor, a twentieth capacitor, and a twenty-first capacitor; one end of the thirteenth resistor and one end of the twentyth capacitor are connected to the control signal output terminal; the other end of the thirteenth resistor and one end of the twenty-first capacitor are connected to the non-inverting input terminal of the third operational amplifier; the other end of the twenty-first capacitor and the other end of the twenty-first capacitor are grounded; the... One end of the twelfth resistor; one end of the eleventh resistor and one end of the seventeenth capacitor are connected to the inverting input of the third operational amplifier; the other end of the twelfth resistor is grounded; the other end of the seventeenth capacitor and the other end of the eleventh resistor are connected to the output of the third operational amplifier; the output of the third operational amplifier is connected to the multiplier circuit; the multiplier circuit includes: a seventh capacitor, an eighth resistor, a multiplier chip, an eighth capacitor, a twelfth capacitor, a fifteenth capacitor, a positive static power supply, and a negative static power supply; one end of the seventh capacitor and one end of the eighth resistor are connected to pin 7 of the multiplier chip; the other end of the seventh capacitor... One end of the resistor is connected to the output of the second operational amplifier; the other end of the eighth resistor is grounded to the second and eighth pins of the multiplier chip; the first pin of the multiplier chip is connected to the output of the third operational amplifier; the fifth pin of the multiplier chip is connected to one end of the twelfth capacitor; the other end of the twelfth capacitor is connected to the second signal processing module; one end of the eighth capacitor, one end of the fifteenth capacitor, and the fourth pin of the multiplier chip are grounded; the positive static power supply and the other end of the eighth capacitor are connected to the sixth pin of the multiplier chip; the negative static power supply and the other end of the fifteenth capacitor are connected to the third pin of the multiplier chip.

[0013] Further, in this embodiment, the power stage amplification module includes a third power supply, a fourth power supply, a fourteenth resistor, a fifteenth resistor, an eighteenth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-third capacitor, a twenty-fourth capacitor, a thirtieth capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a first diode, a third diode, and a power amplifier chip; one end of the twenty-third capacitor is connected to the output terminal of the fourth operational amplifier; the other end of the twenty-third capacitor is connected to one end of the fourteenth resistor; the other end of the fourteenth resistor, one end of the fifteenth resistor, and one end of the twenty-fourth capacitor are connected to the second pin of the power amplifier chip; the other end of the fifteenth resistor, the other end of the twenty-fourth capacitor, the anode of the first diode, and the cathode of the third diode are connected to the output terminal of the power amplifier chip; the cathode of the first diode is connected to the third power supply; the anode of the third diode is connected to the fourth power supply; one end of the eighteenth resistor... The first and fourth pins of the power amplifier chip are grounded; the other end of the eighteenth resistor is connected to the second pin of the power amplifier chip; the seventh and thirteenth pins of the power amplifier chip are connected to the third power supply; the eighth and fifteenth pins of the power amplifier chip are connected to the fourth power supply; the sixth pin of the power amplifier chip is connected to the positive terminal of the thirtieth capacitor; the twelfth pin of the power amplifier chip is connected to the negative terminal of the thirtieth capacitor; one end of the twenty-seventh resistor and the positive terminal of the thirty-fifth capacitor are connected to the tenth pin of the power amplifier chip; one end of the twenty-sixth resistor and the positive terminal of the thirty-fourth capacitor are connected to the ninth pin of the power amplifier chip; the other end of the twenty-sixth resistor and the other end of the twenty-seventh resistor are connected to the third power supply; the negative terminals of the thirty-fourth and thirty-fifth capacitors are grounded; the output terminal of the power amplifier chip is connected to the impedance matching and tuning module.

[0014] Further, in this embodiment, the impedance matching module includes: a first coil and a twenty-sixth capacitor; one end of the twenty-sixth capacitor is connected to the second signal processing module; the other end of the twenty-sixth capacitor is connected to the first pin of the first coil; the second pin of the first coil is grounded; the third pin of the first coil is connected to the voltage sampling module; the fourth pin of the first coil is connected to the current sampling module; the fifth pin of the first coil is connected to the tuning module; the tuning module includes a twenty-ninth capacitor, a thirty-second capacitor, and a thirty-third capacitor; one end of the twenty-ninth capacitor, one end of the thirty-second capacitor, and one end of the thirty-third capacitor are connected to the fifth pin of the first coil; the other ends of the twenty-ninth capacitor and the thirty-second capacitor are connected to the fifth pin of the first coil. The other end of the thirty-third capacitor is grounded; the current sampling module includes a second coil and a twenty-second resistor; the second pin of the second coil is connected to the fourth pin of the first coil; one end of the twenty-second resistor is connected to the second pin of the second coil; the other end of the twenty-second resistor, the first pin of the second coil, and the third pin of the second coil are grounded; the fourth pin of the second coil is connected to the current sampling device; the voltage sampling module includes a nineteenth resistor and a twenty-third resistor; one end of the nineteenth resistor is connected to the third pin of the first coil; the other ends of the nineteenth resistor and the other ends of the twenty-third resistor are connected to the voltage sampling device; one end of the twenty-third resistor is grounded; one end of the nineteenth resistor serves as the output terminal of the ultrasonic signal generating circuit.

[0015] In addition, this application also provides a welding device, including at least one ultrasonic signal generating circuit as described in any of the above embodiments.

[0016] The advantages and beneficial effects of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application:

[0017] This application can generate a drive signal based on a control signal, and after the drive signal undergoes a first amplification, amplitude adjustment, a second amplification, impedance matching, and resonance adjustment, a target ultrasonic signal is obtained. After the above-mentioned first amplification, amplitude adjustment, second amplification, impedance matching, and resonance adjustment, the output waveform is a sine wave, which can ensure that the ultrasonic vibration of ultrasonic processing is always simple harmonic motion, thus being unaffected by the DC component and harmonics in the ultrasonic drive signal, and improving the stability of processing quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an ultrasonic signal generating circuit in a specific embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the first signal processing module in a specific embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the impedance matching and tuning module in a specific embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a signal generation module in a specific embodiment of the present invention;

[0022] Figure 5 This is a circuit diagram of the frequency tracking signal generation module in a specific embodiment of the present invention;

[0023] Figure 6 This is a circuit diagram of the first signal amplification module in a specific embodiment of the present invention;

[0024] Figure 7 This is a circuit schematic diagram of the first signal processing module in a specific embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the second signal processing module in a specific embodiment of the present invention;

[0026] Figure 9 This is a circuit schematic diagram of the second signal processing module in a specific embodiment of the present invention;

[0027] Figure 10 This is a circuit diagram of the impedance matching and tuning module in a specific embodiment of the present invention. Detailed Implementation

[0028] The following detailed description, in conjunction with the accompanying drawings, illustrates the principles and processes of an ultrasonic signal generating circuit and welding equipment according to embodiments of the present invention.

[0029] Reference Figure 1 The present invention provides an ultrasonic signal generating circuit, which may include a signal generating module 1, a first signal processing module 2, a second signal processing module 3, and an impedance matching and tuning module 4, wherein the signal generating module 1 is connected to the first signal processing module 2, the first signal processing module 2 is connected to the second signal processing module 3, and the second signal processing module 3 is connected to the impedance matching and tuning module 4.

[0030] Signal generation module 1 can generate a first driving signal based on the control signal, and can amplify the first driving signal for the first time to obtain a second driving signal with an amplitude several times larger than the first driving signal. First signal processing module 2 can adjust the amplitude of the second driving signal to generate a third driving signal; the third driving signal is a positively and negatively symmetrical, amplitude-controllable ultrasonic driving signal centered on the origin. Second signal processing module 3 can amplify the third driving signal a second time to obtain a fourth driving signal; the fourth driving signal is a driving signal that has been further amplified to a suitable range by a signal-level amplification circuit, and then converted into a power-level amplification circuit. Impedance matching and tuning module 4 can perform impedance matching and resonance adjustment on the fourth driving signal, ultimately obtaining the target ultrasonic signal, which is always a sine wave.

[0031] Furthermore, it should be noted that in this embodiment, whether it is the first amplification or the second amplification, the specific amplification factor can be adjusted according to the actual needs. It can be 5 times, 10 times, or other factors. In specific applications, it can be adjusted by adjusting the component parameters or the model of different components.

[0032] Furthermore, referring to Figure 2 In some embodiments of this application, the first signal processing module may include an amplitude adjustment circuit 21, an analog signal amplification module 22, and a multiplier circuit 23. The amplitude adjustment circuit 21 is connected to the multiplier circuit 23; the analog signal amplification module 22 is connected to the multiplier circuit 23.

[0033] The amplitude adjustment circuit 21 can adjust the second driving signal into a symmetrical signal with positive and negative symmetry centered at 0; the analog signal amplification module 22 can amplify the analog signal for amplitude adjustment sent by the control system into a first analog signal. The first analog signal is the signal after the analog signal for amplitude adjustment sent by the control system has been amplified by a certain factor. The specific amplification factor can be adjusted by the component model or parameters; the multiplier circuit 23 can perform multiplication operations based on the symmetrical signal and the first analog signal to obtain the third driving signal.

[0034] Furthermore, referring to Figure 3 In some embodiments of this application, the impedance matching and tuning module may include an impedance matching module 31, a tuning module 32, a current sampling module 33, and a voltage sampling module 34; the tuning module 32, the current sampling module 33, and the voltage sampling module 34 may be connected to the impedance matching module 31.

[0035] Impedance matching module 31 can adjust the impedance of the entire ultrasonic signal generating circuit, which can improve the power transmission efficiency and the resonance state of the entire system; tuning module 32 can adjust the resonance of the fourth driving signal so that the target ultrasonic signal output by the entire circuit is a sine wave.

[0036] Furthermore, referring to Figure 4 In some embodiments of this application, the signal generation module may include a frequency tracking signal generation module 41 and a first signal amplification module 42; the frequency tracking signal generation module 41 may be connected to the first signal amplification module 42; the frequency tracking signal generation module 41 includes a crystal oscillator generator 411 and a signal generation circuit 412.

[0037] Furthermore, the specific circuit of the frequency tracking signal generation module can be found in [reference needed]. Figure 5 ,exist Figure 5 In this diagram, GND represents the ground terminal. The crystal oscillator generator may include an active crystal oscillator U6 and a first power supply, which is a +5V power supply. The first pin of the active crystal oscillator U6 can be left floating. The second pin of the active crystal oscillator U6 can be grounded. The third pin of the active crystal oscillator U6 can be used as an output terminal to connect to the next stage signal generation circuit. The fourth pin of the active crystal oscillator U6 can be connected to the first power supply +5V.

[0038] And in Figure 5 In the circuit, the signal generation circuit may include a signal generation chip U5, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a thirteenth capacitor C13, and a seventh resistor R7.

[0039] Pin 2 of signal generation chip U5, one end of capacitor C9 (ninth), one end of capacitor C10 (tenth), and one end of capacitor C11 (eleventh) can be connected to the first power supply +5V; the other end of capacitor C11 can be connected to pin 1 of signal generation chip U5; the other end of capacitor C9, the other end of capacitor C10, pin 4 of signal generation chip U5, and pin 9 of signal generation chip U5 can be grounded; one end of capacitor C13 can be connected to pin 3 of signal generation chip U5; the other end of capacitor C13 can be connected to pin 4 of signal generation chip U5; pins 6, 7, and 8 of signal generation chip U5 can receive control signals, which can come from a control module composed of a microcontroller, or from other integrated circuits or a control module integrated by a host computer; pin 10 of signal generation chip U5 can be connected to one end of resistor R7; the other end of resistor R7 can be connected to the first signal amplification module of the next stage.

[0040] In this embodiment, the active crystal oscillator U6 provides the clock signal required for the normal operation of U5. When the control system detects a load change requiring adjustment of the ultrasonic frequency, the control system generates a frequency control word based on its built-in control algorithm and writes the frequency control word into U5 through pins six, seven, and eight. U5 then changes the frequency of its output signal according to the frequency control word, thereby achieving frequency tracking. Further, in some embodiments of this application, refer to... Figure 6 The first signal amplification module may include a first operational amplifier U8B, a second resistor R2, a fourth resistor R4, a tenth resistor R10, a fifth capacitor C5, and a sixteenth capacitor C16. The other end of the seventh resistor R7, one end of the tenth resistor R10, and one end of the sixteenth capacitor C16 are connected to the non-inverting input of the first operational amplifier U8B; the other end of the tenth resistor R10 and the other end of the sixteenth capacitor C16 are grounded. One end of the second resistor R2, one end of the fourth resistor R4, and one end of the fifth capacitor C5 are connected to the inverting input of the first operational amplifier U8B; the other end of the second resistor R2 is grounded; and the other end of the fifth capacitor C5 and the other end of the fourth resistor R4 are connected to the output of the first operational amplifier U8B. In this embodiment, the signal output by the signal generation chip U5 is relatively weak, while the lower-level circuit requires a certain amplitude to function properly. In this embodiment, the operational amplifier circuit, composed of the first operational amplifier U8B and its peripheral circuits, amplifies and conditions the signal to a suitable range before sending it to the next-level circuit. This allows the lower-level circuit to perform its specific function while reducing harmonics or other signal interference.

[0041] Furthermore, in some embodiments of this application, the specific circuitry of the first signal processing module can be referred to... Figure 7 .exist Figure 7 In the diagram, GND represents the ground terminal. The amplitude adjustment circuit may include a second power supply, which is 3.3V, a second operational amplifier U3A, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a ninth resistor R9, a fourth capacitor C4, and a fourteenth capacitor C14.

[0042] One end of the sixth resistor R6, one end of the ninth resistor R9, and one end of the fourteenth capacitor C14 can be connected to the non-inverting input of the second operational amplifier U3A; the other end of the sixth resistor R6 can be connected to the signal generation module; the other ends of the ninth resistor R9 and the fourteenth capacitor C14 can be grounded; one end of the fifth resistor R5, one end of the third resistor R3, and one end of the fourth capacitor C4 can be connected to the inverting input of the second operational amplifier U3A; the other end of the fifth resistor R5 can be connected to the second power supply 3.3V; the other ends of the third resistor R3 and the fourth capacitor C4 can be connected to the output of the second operational amplifier U3A; the output of the second operational amplifier U3A can be connected to the multiplier circuit. In this embodiment, the amplitude adjustment circuit, through U3A and its peripheral circuits, constitutes a subtraction circuit. This subtraction circuit can shift the signal input from the upper stage downwards by 3.3V to make the signal a positive and negative symmetrical signal centered at 0. Figure 7 In the analog signal amplification module, there may be a third operational amplifier U8A, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a seventeenth capacitor C17, a twentieth capacitor C20, and a twenty-first capacitor C21.

[0043] One end of the thirteenth resistor R13 and one end of the twentieth capacitor C20 can be connected to the control signal output terminal; the other end of the thirteenth resistor R13 and one end of the twentyth capacitor C21 can be connected to the non-inverting input terminal of the third operational amplifier U8A; the other end of the twentyth capacitor C21 and the other end of the twentieth capacitor C20 are grounded; one end of the twelfth resistor R12, one end of the eleventh resistor R11, and one end of the seventeenth capacitor C17 can be connected to the inverting input terminal of the third operational amplifier U8A; the other end of the twelfth resistor R12 can be grounded; the other end of the seventeenth capacitor C17 and the other end of the eleventh resistor R11 can be connected to the output terminal of the third operational amplifier U8A; the output terminal of the third operational amplifier U8A can be connected to the multiplier circuit.

[0044] In this embodiment, the analog signal amplification module forms an amplification circuit through the third operational amplifier U8A and its peripheral circuits. It amplifies the analog signal with adjustable amplitude sent from the control system to a certain amplitude. This amplitude can meet the signal strength requirements of the subsequent multiplier circuit and reduce interference from other signals.

[0045] exist Figure 7 In the multiplier circuit, the components may include: a seventh capacitor C7, an eighth resistor R8, a multiplier chip U7, an eighth capacitor C8, a twelfth capacitor C12, a fifteenth capacitor C15, a positive static power supply of +9.6V, and a negative static power supply of -9.6V.

[0046] One end of the seventh capacitor C7 and one end of the eighth resistor R8 can be connected to pin 7 of the multiplier chip U7; the other end of the seventh capacitor C7 can be connected to the output of the second operational amplifier U3A; the other end of the eighth resistor R8 can be grounded to pins 2 and 8 of the multiplier chip U7; pin 1 of the multiplier chip U7 can be connected to the output of the third operational amplifier U8A; pin 5 of the multiplier chip U7 can be connected to one end of the twelfth capacitor C12; the other end of the twelfth capacitor C12 can be connected to the second signal processing module; one end of the eighth capacitor C8, one end of the fifteenth capacitor C15, and pin 4 of the multiplier chip U7 are grounded; the positive quiescent power supply +9.6V and the other end of the eighth capacitor C8 can be connected to pin 6 of the multiplier chip U7; the negative quiescent power supply -9.6V and the other end of the fifteenth capacitor C15 can be connected to pin 3 of the multiplier chip U7.

[0047] In this embodiment, the multiplier chip can complete the calculation at the output based on the inputs X1, X2, Y1 and Y2. The specific formula can be output W = (X1-X2)*(Y1-Y2) / 10V.

[0048] Furthermore, referring to Figure 8 In some embodiments of this application, the second signal processing module may include a signal stage amplification module 81 and a power stage amplification module 82; the signal stage amplification module 81 may be connected to the power stage amplification module 82.

[0049] Furthermore, the specific circuit of the second signal processing module can be referred to Figure 9 .exist Figure 9 In the diagram, GND represents the ground terminal. The signal stage amplification module includes a positive static power supply of +9.6V, a negative static power supply of -9.6V, a sixteenth resistor R16, a seventeenth resistor R17, a twentieth resistor R20, a twenty-first resistor R21, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-second capacitor C22, a twenty-fifth capacitor C25, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a thirty-first capacitor C31, a second diode D2, a fourth diode D4, and a fourth operational amplifier U10.

[0050] One end of the twentieth resistor R20 can be connected to the first signal processing module; the other end of the twentieth resistor R20, the anode of the second diode D2, and the cathode of the fourth diode D4 can be connected to one end of the twenty-seventh capacitor C27; the cathode of the second diode D2 can be connected to the positive static power supply +9.6V; the anode of the fourth diode D4 can be connected to the negative static power supply -9.6V; one end of the twenty-first resistor R21, one end of the twenty-eighth capacitor C28, and one end of the twenty-fourth resistor R24 ​​can be connected to the other end of the twenty-seventh capacitor C27; the other end of the twenty-fourth resistor R24 ​​can be grounded to the other end of the twenty-eighth capacitor C28; the other end of the twenty-first resistor R21, one end of the sixteenth resistor R16, and one end of the twenty-second capacitor C22 can be connected to the first signal processing module. The inverting input of the fourth operational amplifier U10 is connected; the other end of the sixteenth resistor R16 can be connected to one end of the seventeenth resistor R17; the other end of the seventeenth resistor R17 and the other end of the twenty-second capacitor C22 can be connected to the output of the fourth operational amplifier U10; one end of the twenty-fifth capacitor C25 and the positive power supply of the fourth operational amplifier U10 can be connected to the positive quiescent power supply +9.6V; one end of the thirty-first capacitor C31 and the negative power supply of the fourth operational amplifier U10 can be connected to the negative quiescent power supply -9.6V; the other end of the twenty-fifth capacitor C25 and one end of the twenty-fifth resistor R25 can be grounded to the other end of the thirty-first capacitor C31; the other end of the twenty-fifth resistor R25 can be connected to the non-inverting input of the fourth operational amplifier U10.

[0051] The signal stage amplifier circuit in this embodiment consists of a fourth operational amplifier U10 and its peripheral circuits. The signal stage amplifier circuit can further amplify the analog input signal to the upper stage to an amplitude that can cooperate with the normal operation of the subsequent power stage amplifier module.

[0052] Furthermore, in some embodiments of this application, the power stage amplification module is part of the second signal processing module, and its specific structure can also be referred to. Figure 9 .exist Figure 9 In the middle, the power stage amplification module may include a third power supply, which is +25V, a fourth power supply, which is -25V, a fourteenth resistor R14, a fifteenth resistor R15, an eighteenth resistor R18, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a thirtieth capacitor C30, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, a first diode D1, a third diode D3, and a power amplifier chip U9.

[0053] One end of the 23rd capacitor C23 can be connected to the output terminal of the fourth operational amplifier U10; the other end of the 23rd capacitor C23 can be connected to one end of the 14th resistor R14; the other end of the 14th resistor R14, one end of the 15th resistor R15, and one end of the 24th capacitor C24 can be connected to the second pin of the power amplifier chip U9; the other end of the 15th resistor R15, the other end of the 24th capacitor C24, the anode of the first diode D1, and the cathode of the third diode D3 can be connected to the output terminal of the power amplifier chip U9; the cathode of the first diode D1 is connected to the third power supply +25V; the anode of the third diode D3 is connected to the fourth power supply -25V.

[0054] One end of the eighteenth resistor R18, pin 1 of power amplifier chip U9, and pin 4 of power amplifier chip U9 are grounded; the other end of the eighteenth resistor R18 can be connected to pin 2 of power amplifier chip U9; pins 7 and 13 of power amplifier chip U9 are connected to the third power supply +25V; pins 8 and 15 of power amplifier chip U9 are connected to the fourth power supply -25V; pin 6 of power amplifier chip U9 can be connected to the positive terminal of the thirtieth capacitor C30; pin 12 of power amplifier chip U9 can be connected to the negative terminal of the thirtieth capacitor C30. The terminals are connected as follows: one end of the 27th resistor R27 and the positive terminal of the 35th capacitor C35 can be connected to pin 10 of the power amplifier chip U9; one end of the 26th resistor R26 and the positive terminal of the 34th capacitor C34 can be connected to pin 9 of the power amplifier chip U9; the other end of the 26th resistor R26 and the other end of the 27th resistor R27 can be connected to the third power supply +25V; the negative terminals of the 34th capacitor C34 and the 35th capacitor C35 are grounded; the output terminal of the power amplifier chip U9 can be connected to the impedance matching and tuning module.

[0055] The power stage amplifier module in this embodiment consists of U9 and its peripheral circuits. U9 is a power stage audio amplifier that can be powered by ±25V and has a power of up to 100W. This stage of circuitry can convert small signals into power stage drive signals.

[0056] Furthermore, in some embodiments of this application, the specific structure of the impedance matching and tuning module can be referred to... Figure 10 .exist Figure 10 In this context, GND represents the ground terminal, and the impedance matching module may include the first coil T1 and the twenty-sixth capacitor C26.

[0057] One end of the 26th capacitor C26 can be connected to the second signal processing module, and the other end of the 26th capacitor C26 can be connected to the first pin of the first coil T1. The second pin of the first coil T1 is grounded, the third pin of the first coil T1 can be connected to the next-stage voltage sampling module, the fourth pin of the first coil T1 can be connected to the next-stage current sampling module, and the fifth pin of the first coil T1 can be connected to the next-stage tuning module. In this embodiment, the two devices C26 and T1 can constitute the impedance matching circuit for the load of the ultrasonic generator, which ensures efficient power transmission.

[0058] exist Figure 10 In the process, the tuning module may include the twenty-ninth capacitor C29, the thirty-second capacitor C32, and the thirty-third capacitor C33.

[0059] One end of capacitor C29 (29th), capacitor C32 (32nd), and capacitor C33 (33rd) can be connected to pin 5 of coil T1; the other ends of capacitors C29 (29th), C32 (32nd), and C33 (33rd) can be grounded. In this embodiment, the three capacitors C29, C32, and C33 constitute the tuning circuit of the ultrasonic generator, ensuring the resonance state of the entire system.

[0060] exist Figure 10 In this module, the current sampling module may include a second coil T2 and a twenty-second resistor R22.

[0061] The second pin of the second coil T2 can be connected to the fourth pin of the first coil T1; one end of the twenty-second resistor R22 can be connected to the second pin of the second coil T2; the other end of the twenty-second resistor R22, the first pin of the second coil T2, and the third pin of the second coil T2 can be grounded. The fourth pin of the second coil T2 can be connected to a current sampling device. In this embodiment, the current sampling device can be an external device, and the current sampling device can be an existing sampling device. Figure 10 In this process, the voltage sampling module may include the nineteenth resistor R19 and the twenty-third resistor R23.

[0062] One end of the nineteenth resistor R19 can be connected to the third pin of the first coil T1; the other end of the nineteenth resistor R19 and the other end of the twenty-third resistor R23 can be connected to the voltage sampling device, which can be an external device or an existing sampling device; one end of the twenty-third resistor R23 can be grounded; and one end of the nineteenth resistor R19 can be used as the output terminal of the entire ultrasonic signal generating circuit.

[0063] In addition, refer to Figure 9In some embodiments of this application, the third power supply +25V can also be connected to the first filter module, and the fourth power supply -25V can also be connected to the second filter module; the first filter module may include the nineteenth capacitor C19 and the eighteenth capacitor C18, and the second filter module may include the thirty-sixth capacitor C36 and the thirty-seventh capacitor C37.

[0064] In some embodiments of this application, the thirty-fourth capacitor, the thirty-tenth capacitor, and the thirty-fifth capacitor can all be electrolytic capacitors or other polarized capacitors.

[0065] In addition, with Figure 1 Corresponding to the circuit, the embodiments of this application also provide a welding device, which may include at least one ultrasonic signal generating circuit as described in any of the above embodiments.

[0066] The contents of the above-described ultrasonic signal generating circuit embodiments are all applicable to this welding equipment embodiment. The specific functions implemented in this welding equipment embodiment are the same as those in the above-described ultrasonic signal generating circuit embodiments, and the beneficial effects achieved are also the same as those achieved in the above-described ultrasonic signal generating circuit embodiments. Furthermore, although this application is described in the context of functional modules, it should be understood that, unless otherwise stated, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may 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 this application. Rather, considering the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional technology for an engineer. Therefore, those skilled in the art can implement the application set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of this application, which is determined by the full scope of the appended claims and their equivalents.

[0067] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0069] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An ultrasonic signal generating circuit, characterized in that, include: The signal generation module is used to generate a first driving signal based on the control signal, and to amplify the first driving signal for the first time to obtain a second driving signal; The first signal processing module is used to adjust the amplitude of the second driving signal and generate a third driving signal; The second signal processing module is used to amplify the third driving signal a second time to obtain the fourth driving signal; An impedance matching and tuning module is used to perform impedance matching and resonance adjustment on the fourth driving signal to obtain a target ultrasonic signal; the target ultrasonic signal is a sine wave. The signal generation module includes a frequency tracking signal generation module and a first signal amplification module, wherein the frequency tracking signal generation module is connected to the first signal amplification module; the frequency tracking signal generation module includes a crystal oscillator generator and a signal generation circuit. The crystal oscillator generator includes an active crystal oscillator and a first power supply. The first pin of the active crystal oscillator is left floating, the second pin of the active crystal oscillator is grounded, the third pin of the active crystal oscillator is connected to the signal generation circuit as an output terminal, and the fourth pin of the active crystal oscillator is connected to the first power supply. The signal generation circuit includes a signal generation chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a thirteenth capacitor, and a seventh resistor. The second pin of the signal generation chip, one end of the ninth capacitor, one end of the tenth capacitor, and one end of the eleventh capacitor are connected to the first power supply. The other end of the eleventh capacitor is connected to the first pin of the signal generation chip. The other end of the ninth capacitor, the other end of the tenth capacitor, the fourth pin of the signal generating chip, and the ninth pin of the signal generating chip are grounded; one end of the thirteenth capacitor is connected to the third pin of the signal generating chip; the other end of the thirteenth capacitor is connected to the fourth pin of the signal generating chip; the sixth pin, the seventh pin, and the eighth pin of the signal generating chip are used to receive control signals. The tenth pin of the signal generating chip is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the first signal amplification module.

2. The ultrasonic signal generating circuit according to claim 1, characterized in that, The first signal processing module includes an amplitude adjustment circuit, an analog signal amplification module, and a multiplier circuit. The amplitude adjustment circuit is connected to the multiplier circuit; the analog signal amplification module is connected to the multiplier circuit; the amplitude adjustment circuit is used to adjust the second driving signal into a symmetrical signal; the analog signal amplification module is used to amplify the received amplitude-adjusted analog signal into a first analog signal; and the multiplier circuit is used to obtain the third driving signal based on the symmetrical signal and the first analog signal.

3. The ultrasonic signal generating circuit according to claim 1, characterized in that, The second signal processing module includes a signal-level amplification module and a power-level amplification module, wherein the signal-level amplification module is connected to the power-level amplification module; The signal stage amplification module includes a positive static power supply, a negative static power supply, a sixteenth resistor, a seventeenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-second capacitor, a twenty-fifth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a thirty-first capacitor, a second diode, a fourth diode, and a fourth operational amplifier; One end of the twentieth resistor is connected to the first signal processing module; the other end of the twentieth resistor, the anode of the second diode, and the cathode of the fourth diode are connected to one end of the twentieth capacitor; the cathode of the second diode is connected to the positive static power supply; the anode of the fourth diode is connected to the negative static power supply; one end of the twentieth resistor, one end of the twentieth capacitor, and one end of the twentieth resistor are connected to the other end of the twentieth capacitor; the other end of the twentieth resistor and the other end of the twentieth capacitor are grounded. The other end of the 21st resistor, one end of the 16th resistor, and one end of the 22nd capacitor are connected to the inverting input of the fourth operational amplifier; The other end of the sixteenth resistor is connected to one end of the seventeenth resistor; the other end of the seventeenth resistor and the other end of the twenty-second capacitor are connected to the output terminal of the fourth operational amplifier; one end of the twenty-fifth capacitor and the positive power supply terminal of the fourth operational amplifier are connected to the positive quiescent power supply; one end of the thirty-first capacitor and the negative power supply terminal of the fourth operational amplifier are connected to the negative quiescent power supply; the other end of the twenty-fifth capacitor, one end of the twenty-fifth resistor, and the other end of the thirty-first capacitor are grounded; the other end of the twenty-fifth resistor is connected to the non-inverting input terminal of the fourth operational amplifier.

4. The ultrasonic signal generating circuit according to claim 1, characterized in that, The impedance matching and tuning module includes an impedance matching module, a tuning module, a current sampling module, and a voltage sampling module; the tuning module, the current sampling module, and the voltage sampling module are connected to the impedance matching module; the impedance matching module is used to adjust the impedance of the ultrasonic signal generating circuit; the tuning module is used to adjust the resonance of the fourth driving signal so that the target ultrasonic signal is a sine wave.

5. The ultrasonic signal generating circuit according to claim 1, characterized in that, The first signal amplification module includes a first operational amplifier, a second resistor, a fourth resistor, a tenth resistor, a fifth capacitor, and a sixteenth capacitor; The other end of the seventh resistor, one end of the tenth resistor, and one end of the sixteenth capacitor are connected to the non-inverting input of the first operational amplifier; the other end of the tenth resistor and the other end of the sixteenth capacitor are grounded. One end of the second resistor, one end of the fourth resistor, and one end of the fifth capacitor are connected to the inverting input of the first operational amplifier; the other end of the second resistor is grounded; and the other end of the fifth capacitor and the other end of the fourth resistor are connected to the output of the first operational amplifier.

6. The ultrasonic signal generating circuit according to claim 2, characterized in that, The amplitude adjustment circuit includes a second power supply, a second operational amplifier, a third resistor, a fifth resistor, a sixth resistor, a ninth resistor, a fourth capacitor, and a fourteenth capacitor. One end of the sixth resistor, one end of the ninth resistor, and one end of the fourteenth capacitor are connected to the non-inverting input of the second operational amplifier. The other end of the sixth resistor is connected to the signal generation module. The other ends of the ninth resistor and the fourteenth capacitor are grounded. One end of the fifth resistor, one end of the third resistor, and one end of the fourth capacitor are connected to the inverting input of the second operational amplifier. The other end of the fifth resistor is connected to the second power supply. The other ends of the third resistor and the fourth capacitor are connected to the output of the second operational amplifier. The output of the second operational amplifier is connected to the multiplier circuit. The analog signal amplification module includes a third operational amplifier, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a seventeenth capacitor, a twentieth capacitor, and a twenty-first capacitor. One end of the thirteenth resistor and one end of the twentieth capacitor are connected to the control signal output terminal. The other end of the thirteenth resistor and one end of the twentieth capacitor are connected to the non-inverting input terminal of the third operational amplifier. The other end of the twelfth capacitor and the eleventh resistor are connected to the inverting input terminal of the third operational amplifier. The other end of the twelfth resistor is grounded. The other end of the seventeenth capacitor and the other end of the eleventh resistor are connected to the output terminal of the third operational amplifier. The output terminal of the third operational amplifier is connected to the multiplier circuit. The multiplier circuit includes a seventh capacitor, an eighth resistor, a multiplier chip, an eighth capacitor, a twelfth capacitor, a fifteenth capacitor, a positive static power supply, and a negative static power supply. One end of the seventh capacitor and one end of the eighth resistor are connected to pin 7 of the multiplier chip; the other end of the seventh capacitor is connected to the output of the second operational amplifier; the other end of the eighth resistor is grounded to pins 2 and 8 of the multiplier chip; pin 1 of the multiplier chip is connected to the output of the third operational amplifier; pin 5 of the multiplier chip is connected to one end of the twelfth capacitor; the other end of the twelfth capacitor is connected to the second signal processing module; one end of the eighth capacitor, one end of the fifteenth capacitor, and pin 4 of the multiplier chip are grounded. The positive static power supply and the other end of the eighth capacitor are connected to the sixth pin of the multiplier chip; the negative static power supply and the other end of the fifteenth capacitor are connected to the third pin of the multiplier chip.

7. The ultrasonic signal generating circuit according to claim 3, characterized in that, The power stage amplification module includes a third power supply, a fourth power supply, a fourteenth resistor, a fifteenth resistor, an eighteenth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-third capacitor, a twenty-fourth capacitor, a thirtieth capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a first diode, a third diode, and a power amplification chip; One end of the 23rd capacitor is connected to the output terminal of the fourth operational amplifier; the other end of the 23rd capacitor is connected to one end of the 14th resistor. The other end of the fourteenth resistor, one end of the fifteenth resistor, and one end of the twenty-fourth capacitor are connected to the second pin of the power amplifier chip; the other end of the fifteenth resistor, the other end of the twenty-fourth capacitor, the anode of the first diode, and the cathode of the third diode are connected to the output terminal of the power amplifier chip; the cathode of the first diode is connected to the third power supply; and the anode of the third diode is connected to the fourth power supply. One end of the eighteenth resistor, the first pin of the power amplifier chip, and the fourth pin of the power amplifier chip are grounded; The other end of the eighteenth resistor is connected to the second pin of the power amplifier chip; The seventh and thirteenth pins of the power amplifier chip are connected to the third power supply; the eighth and fifteenth pins of the power amplifier chip are connected to the fourth power supply. The sixth pin of the power amplifier chip is connected to the positive terminal of the thirtieth capacitor; the twelfth pin of the power amplifier chip is connected to the negative terminal of the thirtieth capacitor; one end of the twenty-seventh resistor and the positive terminal of the thirty-fifth capacitor are connected to the tenth pin of the power amplifier chip. One end of the 26th resistor and the positive terminal of the 34th capacitor are connected to pin 9 of the power amplifier chip; the other end of the 26th resistor and the other end of the 27th resistor are connected to the third power supply; the negative terminals of the 34th capacitor and the 35th capacitor are grounded; the output terminal of the power amplifier chip is connected to the impedance matching and tuning module.

8. The ultrasonic signal generating circuit according to claim 4, characterized in that, The impedance matching module includes a first coil and a twenty-sixth capacitor. One end of the twenty-sixth capacitor is connected to the second signal processing module; the other end of the twenty-sixth capacitor is connected to the first pin of the first coil. The second pin of the first coil is grounded; the third pin of the first coil is connected to the voltage sampling module; the fourth pin of the first coil is connected to the current sampling module; and the fifth pin of the first coil is connected to the tuning module. The tuning module includes a 29th capacitor, a 32nd capacitor, and a 33rd capacitor. One end of the 29th capacitor, one end of the 32nd capacitor, and one end of the 33rd capacitor are connected to the fifth pin of the first coil. The other ends of the 29th capacitor, the 32nd capacitor, and the 33rd capacitor are grounded. The current sampling module includes a second coil and a twenty-second resistor, with the second pin of the second coil connected to the fourth pin of the first coil; One end of the 22nd resistor is connected to the second pin of the 2nd coil; The other end of the 22nd resistor, the first pin of the 2nd coil, and the third pin of the 2nd coil are grounded; the fourth pin of the 2nd coil is connected to the current sampling device. The voltage sampling module includes a nineteenth resistor and a twenty-third resistor. One end of the nineteenth resistor is connected to the third pin of the first coil. The other ends of the nineteenth resistor and the twenty-third resistor are connected to the voltage sampling device. One end of the twenty-third resistor is grounded. One end of the nineteenth resistor serves as the output terminal of the ultrasonic signal generating circuit.

9. A welding device, characterized in that, It includes at least one ultrasonic signal generating circuit as described in any one of claims 1-8.

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