Ultrasonic power supply amplitude feedback control system

Abstract

The utility model relates to the technical field of ultrasonic power supplies, in particular to an ultrasonic power supply amplitude feedback control system, which comprises an ultrasonic transduction equivalent module for collecting total input current and comprising an ultrasonic transducer electrical equivalent path and a mechanical equivalent path which are connected in parallel; the shunt module is connected with the ultrasonic transduction equivalent module in parallel and comprises a capacitor C2 of a to-be-integrated detection voltage; and the sampling processing module is connected with the two ends of the capacitor C2 through a direct current conversion filtering module and a transformer, the voltage of the capacitor C2 is obtained through sampling integral conversion by combining an integral formula, then the working amplitude of the ultrasonic transducer is obtained by combining the total input current, and corresponding adjustment information is fed back to adjust the ultrasonic power supply. According to the utility model, the resonance working frequency of the transducer is rapidly detected, and the amplitude is controlled by adjusting the working current and frequency of the transducer, so that the mechanical friction force output by the ultrasonic transducer is controlled, and the final welding effect is ensured; and the purposes of protecting the transducer from being overloaded, ensuring the working stability of the transducer, prolonging the service life of the ultrasonic transducer and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic power supplies, in particular to an ultrasonic power supply amplitude feedback control system. Background Art

[0002] Ultrasonic transducer is a device that converts electrical energy into mechanical energy. Under normal circumstances, a high-power ultrasonic driving power supply will use the working current of the transducer as a reference for controlling the output, and adjust the output frequency within the working frequency range of the transducer to drive the transducer to work. However, under different loads, different amplitude rods, different tool heads, different welding materials, etc., the transducer will convert electrical energy into mechanical energy at different rates due to different pressures or the transducer itself. In order to ensure that the output energy can meet the welding requirements, the power supply will increase the output amplitude. When the upper limit of the transducer amplitude is exceeded, the transducer itself or the tool head will be directly damaged, affecting the life of the transducer.

[0003] Therefore, it is urgent to provide an ultrasonic power supply amplitude feedback control system to overcome the above-mentioned defects. Utility Model Content

[0004] The main purpose of the utility model is to provide an ultrasonic power supply amplitude feedback control system, which has the function of quickly detecting the optimal working frequency of the transducer, controlling the amplitude by adjusting the working current and frequency of the transducer, thereby controlling the size of the mechanical friction force output by the ultrasonic transducer, thereby ensuring the final welding effect, protecting the transducer from overload, thereby ensuring its working stability and increasing the service life of the ultrasonic transducer.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An ultrasonic power supply amplitude feedback control system, comprising:

[0007] Ultrasonic transducer equivalent module, for collecting total input current, including the electrical equivalent path and mechanical equivalent path of the ultrasonic transducer connected in parallel;

[0008] A shunt module, connected in parallel with the ultrasonic transducer equivalent module, comprising a capacitor C2 for integrating the detected voltage;

[0009] The sampling and processing module is connected to the two ends of the capacitor C2 through the DC conversion filter module and the transformer, and the voltage of the capacitor C2 is converted by sampling and integration in combination with the integral formula, and then the working amplitude of the ultrasonic transducer is obtained by combining the total input current, and the corresponding adjustment information is fed back to adjust the ultrasonic power supply.

[0010] Preferably, the ultrasonic transducer electrical equivalent path includes a capacitor C0.

[0011] Preferably, the mechanical equivalent path comprises: an inductor L1, a capacitor C1 and a resistor RL which are connected in series and connected to the electrical equivalent path of the ultrasonic transducer.

[0012] Preferably, the shunt module comprises: a plurality of capacitors C connected in series and the capacitor C2 connected in series with each of the capacitors C.

[0013] Preferably, the sampling processing module includes:

[0014] A sampling unit, connected to the DC conversion filter module, sampling and integrating the capacitor C2;

[0015] The processor is connected to the sampling unit and the ultrasonic power supply, and calculates the voltage of the capacitor C2 according to the integral formula and calculates the amplitude of the ultrasonic transducer in combination with the total input current.

[0016] Preferably, the integral formula is: Wherein, Uc2 is the voltage across the capacitor C2, t is the acquisition time, AD is the system acquisition value, and K1 and A1 are conversion coefficients.

[0017] The beneficial effects of the utility model are as follows: by designing an ultrasonic transducer equivalent module and a shunt module connected in parallel with the ultrasonic transducer equivalent module, the sampling and processing module integrates the capacitor C2 in the shunt module to calculate its voltage, and converts the ultrasonic transducer amplitude in combination with the total input current obtained by the ultrasonic transducer equivalent module. The processor in the sampling and processing module controls the ultrasonic transducer amplitude according to information corresponding to the amplitude value feedback, so that the system has the ability to quickly detect the optimal operating frequency of the transducer, control the amplitude by adjusting the operating current and frequency of the transducer, and thus control the size of the mechanical friction force output by the ultrasonic transducer, thereby ensuring the final welding effect, and also achieving the purpose of protecting the transducer from overload, thereby ensuring its working stability and increasing the service life of the ultrasonic transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a module block diagram of an embodiment of an ultrasonic power supply amplitude feedback control system of the present utility model.

[0019] Figure 2 for Figure 1 Partial circuit diagram.

[0020] Description of the figure numbers in the manual:

[0021] 1-ultrasonic transducer equivalent module, 2-shunt module, 4-DC conversion filter module, 3-transformer, 5-sampling processing module, 51-sampling unit, 52-processor. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] See also Figure 1 and Figure 2 An ultrasonic power supply amplitude feedback control system of the present embodiment includes: an ultrasonic transducer equivalent module 1 for collecting total input current, including an ultrasonic transducer electrical equivalent path and a mechanical equivalent path connected in parallel, a shunt module 2 connected in parallel with the ultrasonic transducer equivalent module 1, including a capacitor C2 whose voltage is to be integrated and detected, and a DC conversion filter module 4 and a transformer 3 connected to both ends of the capacitor C2, combining the integral formula to sample and integrate to calculate the voltage of the capacitor C2, and then combining the total input voltage and the total input current to obtain the working amplitude of the ultrasonic transducer, and feeding back corresponding adjustment information to adjust the ultrasonic power supply sampling processing module 5.

[0024] Specifically, the electrical equivalent path of the ultrasonic transducer includes a capacitor C0, the mechanical equivalent path includes: an inductor L1, a capacitor C1 and a resistor RL connected in series and connected to the electrical equivalent path of the ultrasonic transducer, the shunt module 2 includes: a plurality of capacitors C connected in series and the capacitor C2 connected in series with each of the capacitors C, the two ends of the capacitor C2 are connected in series with a resistor R and then connected to the transformer 3, the transformer 3 is connected to the DC conversion filter module 4, the sampling and processing module 5 includes: a sampling unit 51 connected to the DC conversion filter module 4, sampling and integrating the capacitor C2, and a processor 52 connected to the sampling unit 51 and the ultrasonic power supply, calculating the voltage of the capacitor C2 by the integral formula and calculating the amplitude of the ultrasonic transducer in combination with the total input current. It should be noted that the DC filtering of the DC conversion filter module 4 is a prior art application, so it is not repeated here.

[0025] More specifically, the integral formula is: Wherein, Uc2 is the voltage across the capacitor C2, t is the acquisition time, AD is the system acquisition value, K1 and A1 are both conversion coefficients. After the voltage Uc2 of the capacitor C2 is calculated, the current Ic2 of the capacitor is calculated by the impedance Xc2 of the capacitor C2. Then, through the shunt principle of parallel capacitors, combined with the known static capacitance impedance Xc0 of the ultrasonic transducer, the current passing through it can be obtained. Where Ic0 is the current of capacitor C0, Ic2 is the current of capacitor C2, Xc2 is the impedance of capacitor C2, Xc0 is the impedance of capacitor C0, and K2 is the compensation coefficient. Combined with the total input current Ie obtained by sampling measurement, the current Ic1=Ie-Ic0-Ic2 that passes through the mechanical equivalent path to do mechanical work is calculated. At this time, the amplitude of the ultrasonic transducer is positively correlated with the current Ic1 of the mechanical equivalent path. The actual amplitude Ason=K3*∫Ic1(t)*dt can be obtained by coefficient calibration. Where Ason is amplitude, Ic1 is the current of capacitor C1, K3 is the correction factor, dt is time, the processor 52 adjusts the output frequency and amplitude of the ultrasonic power supply by the obtained amplitude, so that the ultrasonic transducer works in the most efficient state. More specifically, the calibration method of the coefficient calibration is: the controller controls the output of the ultrasonic power supply to make the transducer current Ic1 fall within a reasonable range, and then the actual mechanical amplitude of the transducer when working at this time is measured by the micrometer, and different current values ​​and corresponding mechanical amplitudes are taken repeatedly, and then the correction coefficient K3 is obtained by fitting. It should be noted that the sampling integration is combined with the application of the existing technology, so it is not repeated here.

[0026] From the above description, it can be seen that the utility model converts the amplitude of the ultrasonic transducer by adding an ultrasonic transducer equivalent module 1 and a shunt module 2, combined with the existing sampling means and the processor 5, so as to adjust the output frequency and amplitude of the ultrasonic power supply in real time, so that the transducer works in the most efficient state. The utility model has the function of quickly detecting the optimal working frequency of the transducer, controlling the amplitude by adjusting the working current and frequency of the transducer, thereby controlling the size of the mechanical friction force output by the ultrasonic transducer, thereby ensuring the final welding effect, and also achieving the purpose of protecting the transducer from overload, thereby ensuring its working stability and increasing the service life of the ultrasonic transducer.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An ultrasonic power supply amplitude feedback control system, characterized in that: include: Ultrasonic transducer equivalent module, for collecting total input current, including the electrical equivalent path and mechanical equivalent path of the ultrasonic transducer connected in parallel; A shunt module, connected in parallel with the ultrasonic transducer equivalent module, comprising a capacitor C2 for integrating the detected voltage; The sampling and processing module is connected to the two ends of the capacitor C2 through the DC conversion filter module and the transformer, and the voltage of the capacitor C2 is converted by sampling and integration in combination with the integral formula, and then the working amplitude of the ultrasonic transducer is obtained by combining the total input current, and the corresponding adjustment information is fed back to adjust the ultrasonic power supply.

2. The ultrasonic power supply amplitude feedback control system according to claim 1, characterized in that: The ultrasonic transducer electrical equivalent path includes a capacitor C0.

3. The ultrasonic power supply amplitude feedback control system according to claim 1 or 2, characterized in that: The mechanical equivalent path includes: an inductor L1, a capacitor C1 and a resistor RL which are connected in series and connected to the electrical equivalent path of the ultrasonic transducer.

4. The ultrasonic power supply amplitude feedback control system according to claim 1, characterized in that: The shunt module includes: a plurality of capacitors C connected in series and the capacitor C2 connected in series with each of the capacitors C.

5. The ultrasonic power supply amplitude feedback control system according to claim 1, characterized in that: The sampling processing module comprises: A sampling unit, connected to the DC conversion filter module, sampling and integrating the capacitor C2; The processor is connected to the sampling unit and the ultrasonic power supply, and calculates the voltage of the capacitor C2 according to the integral formula and calculates the amplitude of the ultrasonic transducer in combination with the total input current.

6. The ultrasonic power supply amplitude feedback control system according to claim 1, characterized in that: The integral formula is: Wherein, Uc2 is the voltage across the capacitor C2, t is the acquisition time, AD is the system acquisition value, and K1 and A1 are conversion coefficients.

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