CN111940270B - Automatic frequency-following DSP ultrasonic generator - Google Patents
Automatic frequency-following DSP ultrasonic generator Download PDFInfo
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- CN111940270B CN111940270B CN202010763865.9A CN202010763865A CN111940270B CN 111940270 B CN111940270 B CN 111940270B CN 202010763865 A CN202010763865 A CN 202010763865A CN 111940270 B CN111940270 B CN 111940270B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 60
- 238000002604 ultrasonography Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
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- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of ultrasonic waves, and discloses an automatic frequency tracking DSP ultrasonic generator with stable frequency tracking signals and always at a resonance point, which comprises: the silicon controlled rectifier is arranged in the ultrasonic generator and used for receiving a fixed frequency signal and converting the fixed frequency signal into a direct current signal; one end of a primary winding of the high-voltage transformer is connected with one end of the controllable silicon; one input end of the high-frequency inverter circuit is connected with one end of the controllable silicon, and an input direct-current signal is converted into an alternating high-frequency square wave voltage signal through the processing of the high-voltage transformer and the high-frequency inverter circuit; the input end of the ultrasonic transducer is respectively connected with the secondary winding of the high-voltage transformer, and an alternating high-frequency square wave voltage signal output after conversion is added to the ultrasonic transducer, so that the ultrasonic transducer generates resonant frequency, a frequency tracking signal is generated through the resonant frequency, and a signal sent by the generator is kept at the resonant point of the ultrasonic transducer.
Description
Technical Field
The invention relates to the technical field of ultrasonic waves, in particular to an automatic frequency-following DSP ultrasonic generator.
Background
An ultrasonic generator is a device which converts commercial power into high-frequency alternating current corresponding to a transducer to drive the transducer to work, and is an important component of a high-power ultrasonic system. The input of the ultrasonic generator is a fixed-frequency signal, the waveform of the signal is indefinite, the signal can be sinusoidal and can be pulsed, but the frequency of the signal is fixed as the frequency of the energy converter, and the output of the signal is a power signal and a frequency tracking signal through the internal conversion of the ultrasonic generator. At present, when an ultrasonic generator provides a frequency tracking signal, the signal sent by the generator cannot be at the resonance point of an ultrasonic transducer, so that the working state of the generator is poor.
Therefore, how to keep the frequency tracking signal emitted by the generator at the resonance point of the transducer becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic frequency tracking DSP ultrasonic generator with stable frequency tracking signals and always at a resonance point, aiming at the defect that the working state of the generator is poor because the signals sent by the generator cannot be at the resonance point of an ultrasonic transducer in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an automatic frequency-tracking DSP ultrasonic generator is constructed, and the generator comprises:
the silicon controlled rectifier is configured in the ultrasonic generator and used for receiving a fixed frequency signal and converting the fixed frequency signal into a direct current signal;
one end of a primary winding of the high-voltage transformer is connected with one end of the controllable silicon;
one input end of the high-frequency inverter circuit is connected with one end of the controllable silicon,
converting the input direct current signal into an alternating high-frequency square wave voltage signal through the processing of the high-voltage transformer and the high-frequency inverter circuit;
the input end of the ultrasonic transducer is respectively connected with the secondary winding of the high-voltage transformer, the alternating high-frequency square wave voltage signal output after conversion is added to the ultrasonic transducer,
the ultrasonic transducer is caused to generate a resonant frequency through which a frequency tracking signal is generated, thereby maintaining the signal emitted by the generator at the resonant point of the ultrasonic transducer.
In some embodiments, the high frequency inverter circuit includes a first switch tube and a second switch tube, wherein,
the emitter of the first switch tube is connected with the collector of the second switch tube,
the collector of the first switch tube is connected with one output end of the controllable silicon;
the emitter of the second switch tube is connected with the other output end of the controllable silicon,
and the grids of the first switching tube and the second switching tube are respectively connected with the signal output end of an external driving circuit.
In some embodiments, the power supply further comprises a filter circuit, wherein the input ends of the filter circuit are respectively connected with the output ends of the power grid, and the filter circuit is used for receiving the alternating voltage output by the power grid;
and the output end of the filter circuit is respectively connected with the signal input end of the controllable silicon.
In some embodiments, the filter circuit includes a first capacitor, a first inductor, and a second capacitor, wherein,
the first capacitor is connected with the second capacitor in parallel, and one end of the first capacitor is connected with one end of the first inductor;
one end of the second capacitor is connected with the other end of the first inductor.
In some embodiments, the high-frequency inverter further comprises a clamping circuit, wherein one end of the clamping circuit is connected with one end of the high-frequency inverter circuit;
the other end of the clamping circuit is connected with one end of the controlled silicon.
In some embodiments, the clamping circuit includes a sixth diode and a seventh diode,
the anode of the sixth diode is respectively connected with the cathode of the seventh diode and the emitter of the first switching tube;
the cathode of the sixth diode is coupled to the collector of the first switching tube;
the anode of the seventh diode is coupled to the emitter of the second switching tube.
In some embodiments, the device further comprises a first resistor, a second resistor, a third capacitor and a fourth capacitor;
the first resistor is connected in series with the second resistor;
the third capacitor is connected in series with the fourth capacitor;
the first resistor and the second resistor connected in series are connected in parallel with the third capacitor and the fourth capacitor connected in series.
In some embodiments, the high-voltage transformer further comprises a fifth capacitor, and one end of the fifth capacitor is connected with one end of the primary winding of the high-voltage transformer;
the other end of the fifth capacitor is connected with one end of the third capacitor and one end of the fourth capacitor.
The automatic frequency-following DSP ultrasonic generator comprises a silicon controlled rectifier for converting a fixed frequency signal into a direct current signal, converts the input direct current signal into an alternating high-frequency square wave voltage signal through the processing of a high-voltage transformer and a high-frequency inverter circuit, and adds the alternating high-frequency square wave voltage signal output after conversion to an ultrasonic transducer, so that the ultrasonic transducer generates a resonance frequency, a frequency tracking signal is generated through the resonance frequency, and the signal sent by the generator is kept at the resonance point of the ultrasonic transducer. Compared with the prior art, the frequency tracking signal is generated by the ultrasonic transducer, so that the signal sent by the generator can be kept at the resonance point of the ultrasonic transducer, and the working state of the generator is in a better state.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a main control circuit diagram of an embodiment of an automatic frequency-tracking DSP ultrasonic generator provided by the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 is a main control circuit diagram of an embodiment of an automatic frequency-tracking DSP ultrasonic generator provided by the present invention. As shown in fig. 1, in the first embodiment of the automatic frequency-tracking DSP ultrasonic generator of the present invention, the main control circuit of the automatic frequency-tracking DSP ultrasonic generator includes a silicon controlled rectifier SCR, a high voltage transformer Tr101, a high frequency inverter circuit 103, and an ultrasonic transducer 104.
The SCR (corresponding to D101-D104) is a high-power electrical component, also called a thyristor, and has the advantages of small volume, high efficiency, long service life and the like. In an automatic control system, the device can be used as a high-power driving device to realize the control of high-power equipment by using a low-power control.
The high voltage transformer Tr101 is a transformer that converts a low voltage into a high voltage by electromagnetic induction, and is composed of an iron core and a primary and secondary winding.
The high-frequency inverter circuit 103 converts a direct-current voltage into an alternating high-frequency square-wave voltage.
The ultrasonic transducer 104 is an energy conversion device having characteristic parameters of a resonance frequency, a frequency bandwidth, an impedance characteristic, a frequency characteristic, a directivity, a transmission and reception sensitivity. Among these, transducers for different purposes have different requirements on performance parameters, such as: for an emissive transducer, the transducer is required to have a large output power and a high energy conversion efficiency; whereas for a receiving transducer, a wide frequency band and high sensitivity and resolution are required.
Specifically, the SCR is disposed in the ultrasonic generator, and is configured to receive a fixed frequency signal (50HZ), and the SCR can convert the input fixed frequency signal into a dc signal and then output the dc signal to the high voltage transformer Tr101 and the high frequency inverter circuit 103.
One end of the primary winding N1 of the high voltage transformer Tr101 is connected to one end of the SCR, and is configured to receive a dc signal.
An input end of the high-frequency inverter circuit 103 is connected to one end of the silicon controlled rectifier SCR, and is configured to receive a direct current signal.
The other end of the primary winding N1 of the high-voltage transformer Tr101 is connected to an output end of the high-frequency inverter circuit 103, and the input dc signal is processed by the high-voltage transformer Tr101 and the high-frequency inverter circuit 103, so that the input dc signal is converted into an alternating high-frequency square-wave voltage signal, and then the alternating high-frequency square-wave voltage signal is output to the ultrasonic transducer 104.
The input end of the ultrasonic transducer 104 is connected with the secondary winding N2 of the high voltage transformer Tr101, and the converted output alternating high frequency square wave voltage signal is applied to the ultrasonic transducer 104, so that the ultrasonic transducer 104 generates a resonance frequency, and a frequency tracking signal is generated through the resonance frequency, and further the signal emitted by the generator is kept at the resonance point of the ultrasonic transducer 104, so as to ensure that the efficiency is high when the frequency of the ultrasonic transducer 104 is at the resonance frequency point, and the frequency tracking signal can be provided, so that the signal emitted by the generator is controlled to be always at the resonance point of the ultrasonic transducer 104, and the ultrasonic generator is in a better working state.
In some embodiments, in order to obtain an alternating high-frequency square wave voltage, a first switching tube (corresponding to IGBT 1) and a second switching tube (corresponding to IGBT2) may be disposed in the high-frequency inverter circuit 103, wherein the IGBT is an Insulated Gate bipolar transistor.
Specifically, an emitter of the first switching tube (corresponding to IGBT 1) is connected to a collector of the second switching tube (corresponding to IGBT2), the collector of the first switching tube (corresponding to IGBT 1) is connected to one output terminal of the SCR, and the emitter of the second switching tube (corresponding to IGBT2) is connected to the other output terminal of the SCR.
The grids of the first switch tube (corresponding to the IGBT 1) and the second switch tube (corresponding to the IGBT2) are respectively connected with the signal output end of the external drive circuit. The first switching tube (corresponding to the IGBT 1) and the second switching tube (corresponding to the IGBT2) are connected into a pair of half-bridge inverters with the mutual difference of 180 degrees.
That is, the external driving circuit outputs a PWM pulse signal for driving the first switching tube (corresponding to the IGBT 1) and the second switching tube (corresponding to the IGBT2), and the first switching tube (corresponding to the IGBT 1) and the second switching tube (corresponding to the IGBT2) are alternately turned on and off by being triggered by the input PWM pulse signal, thereby converting the dc voltage into an alternating high-frequency square wave voltage.
In some embodiments, in order to improve the smoothness of the input current signal, a filter circuit 101 may be disposed in the ultrasonic generator, and is used for filtering the input ac signal so that the waveform of the output ac signal is smoother.
Specifically, the input ends of the filter circuit 101 are respectively connected to the output ends of the power grid (corresponding to 220V), and are configured to receive an ac voltage output by the power grid and filter the ac voltage.
The output end of the filter circuit 101 is connected to the signal input end of the silicon controlled rectifier SCR, and the input fixed frequency signal (corresponding to the ac voltage) can be converted into the dc signal by the silicon controlled rectifier SCR.
In some embodiments, in order to improve the operation stability of the filter circuit 101, a first capacitor C101, a first inductor L101, and a second capacitor C102 may be disposed in the filter circuit 101, wherein the first capacitor C101 and the second capacitor C102 are filter capacitors, and the first inductor L101 is a filter inductor.
Specifically, the first capacitor C101 is connected in parallel with the second capacitor C102, one end of the first capacitor C101 is connected to one end of the first inductor L101, and one end of the second capacitor C102 is connected to the other end of the first inductor L101.
That is, the first capacitor C101, the second capacitor C102, and the first inductor L101 filter the input ac voltage signal, thereby improving the smoothness of the ac voltage signal.
In some embodiments, in order to ensure the safety of the operation of the first switching tube (corresponding to IGBT 1) and the second switching tube (corresponding to IGBT2), a clamp circuit 102 may be disposed in the main control circuit, wherein the clamp circuit 102 may maintain the top or bottom of the periodically varying waveform at a certain dc level.
Specifically, one end of the clamp circuit 102 is connected to one end of the high-frequency inverter circuit 103, the other end of the clamp circuit 102 is connected to one end of the SCR, and the voltage of the collector of the first switching tube (corresponding to the IGBT 1) can be clamped to about 17V by the clamp circuit 102.
In some embodiments, the clamping circuit 102 includes a third resistor R103, a fourth resistor R104, a seventh capacitor C107, an eighth capacitor C108, a sixth diode D106, and a seventh diode D107, wherein the third resistor R103, the fourth resistor R104, the seventh capacitor C107, and the eighth capacitor C108 are connected in sequence and then connected in parallel with the sixth diode D106 and the seventh diode D107.
Specifically, the anode of the sixth diode D106 is connected to the cathode of the seventh diode D107 and the emitter of the first switching tube (corresponding to the IGBT 1), and the cathode of the sixth diode D106 is connected to the collector of the first switching tube (corresponding to the IGBT 1).
The anode of the seventh diode D107 is connected to the emitter of the second switching tube (corresponding to IGBT 2).
In some embodiments, in order to improve the performance of the main control circuit, a first resistor R101, a second resistor R102, a third capacitor C103, and a fourth capacitor C104 may be disposed in the main control circuit.
The first resistor R101 is connected in series with the second resistor R102, and the third capacitor C103 is connected in series with the fourth capacitor C104.
The first resistor R101 and the second resistor R102 connected in series are connected in parallel with the third capacitor C103 and the fourth capacitor C104 connected in series.
In some embodiments, the main control circuit further includes a fifth capacitor C105, one end of the fifth capacitor C105 is connected to one end of the primary winding N1 of the high voltage transformer Tr101, and the other end of the fifth capacitor C105 is connected to one ends of the third capacitor C103 and the fourth capacitor C104.
In some embodiments, the driving circuit further includes a digital signal processor (corresponding to DSP), which serves as a core processor of the driving circuit, and the 6-way PWM signal outputted by the driving circuit can implement the phase shift control of the first switching tube (corresponding to IGBT 1) and the second switching tube (corresponding to IGBT2) of the high-frequency inverter circuit 102, and the 12-bit a/D converter acquisition can implement the voltage and current sampling and meet the requirement of the sampling data precision.
The phase difference can be accurately calculated by utilizing the capturing function of the timer in the digital signal processing, and the frequency tracking control of the system is realized. The control of 5-bit half-digital tube can be realized by using the serial peripheral interface SPI in cooperation with the display screen, so that the display of system frequency and power is realized.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. An automatic frequency-tracking DSP ultrasonic generator is characterized by comprising:
the silicon controlled rectifier is configured in the ultrasonic generator and used for receiving a fixed frequency signal and converting the fixed frequency signal into a direct current signal;
one end of a primary winding of the high-voltage transformer is connected with one end of the controllable silicon;
one input end of the high-frequency inverter circuit is connected with one end of the controllable silicon;
converting the input direct current signal into an alternating high-frequency square wave voltage signal through the processing of the high-voltage transformer and the high-frequency inverter circuit;
the input end of the ultrasonic transducer is respectively connected with the secondary winding of the high-voltage transformer, the alternating high-frequency square wave voltage signal output after conversion is applied to the ultrasonic transducer,
enabling the ultrasonic transducer to generate a resonant frequency, generating a frequency tracking signal through the resonant frequency, and keeping a signal sent by a generator at a resonant point of the ultrasonic transducer;
the high-frequency inverter circuit comprises a first switch tube and a second switch tube, wherein,
the emitter of the first switch tube is connected with the collector of the second switch tube,
the collector of the first switch tube is connected with one output end of the controllable silicon;
the emitter of the second switch tube is connected with the other output end of the controllable silicon,
the grid electrodes of the first switch tube and the second switch tube are respectively connected with the signal output end of an external drive circuit;
the filter circuit also comprises a filter circuit, the input end of the filter circuit is respectively connected with the output end of the power grid and is used for receiving the alternating voltage output by the power grid,
the output end of the filter circuit is respectively connected with the signal input end of the controllable silicon;
the filter circuit comprises a first capacitor, a first inductor and a second capacitor, wherein,
the first capacitor is connected with the second capacitor in parallel, and one end of the first capacitor is connected with one end of the first inductor;
one end of the second capacitor is connected with the other end of the first inductor;
the high-frequency inverter circuit also comprises a clamping circuit, one end of the clamping circuit is connected with one end of the high-frequency inverter circuit,
the other end of the clamping circuit is connected with one end of the controlled silicon;
the clamping circuit includes a sixth diode and a seventh diode,
the anode of the sixth diode is respectively connected with the cathode of the seventh diode and the emitter of the first switching tube;
the cathode of the sixth diode is coupled to the collector of the first switching tube;
the anode of the seventh diode is coupled to the emitter of the second switching tube.
2. The automatic frequency-tracking DSP ultrasound generator according to claim 1,
the circuit also comprises a first resistor, a second resistor, a third capacitor and a fourth capacitor;
the first resistor is connected in series with the second resistor;
the third capacitor is connected in series with the fourth capacitor;
the first resistor and the second resistor connected in series are connected in parallel with the third capacitor and the fourth capacitor connected in series.
3. The automatic frequency-tracking DSP ultrasound generator according to claim 2,
the high-voltage transformer further comprises a fifth capacitor, one end of the fifth capacitor is connected with one end of the primary winding of the high-voltage transformer,
the other end of the fifth capacitor is connected with one end of the third capacitor and one end of the fourth capacitor.
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| CN202010763865.9A CN111940270B (en) | 2020-08-01 | 2020-08-01 | Automatic frequency-following DSP ultrasonic generator |
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| CN202010763865.9A CN111940270B (en) | 2020-08-01 | 2020-08-01 | Automatic frequency-following DSP ultrasonic generator |
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| CN115395802B (en) * | 2022-08-29 | 2023-06-02 | 广东利元亨智能装备股份有限公司 | Ultrasonic power supply circuit and ultrasonic welding device |
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| CN1145445A (en) * | 1995-09-01 | 1997-03-19 | 孙连贵 | Large power supersonic signal generator |
| US6246153B1 (en) * | 1998-07-16 | 2001-06-12 | Face International Corp. | Positive feedback resonant transducer circuit |
| CN103401530A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | Impedance stepless matching network used for ultrasonic power supply and control method |
| DE102012018740A1 (en) * | 2012-09-18 | 2014-03-20 | Reinhard Gerasch | Method for generating ultrasonic energy in pulse ultrasonic generator that is utilized for e.g. steam and heating boilers, involves ensuring operation of continuous oscillations with amplitude value of current oscillations |
| CN103973262A (en) * | 2014-04-04 | 2014-08-06 | 华南理工大学 | Ultrasonic power source for transducer cascading |
| CN104811055A (en) * | 2015-04-22 | 2015-07-29 | 华南理工大学 | High power wideband ultrasonic power supply based on silicon carbide device and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512434A (en) * | 2018-03-13 | 2018-09-07 | 深圳市大七易科技有限公司 | A kind of ultrasonic bonding supply frequency fuzzy self-adaption chases after frequency method |
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- 2020-08-01 CN CN202010763865.9A patent/CN111940270B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1145445A (en) * | 1995-09-01 | 1997-03-19 | 孙连贵 | Large power supersonic signal generator |
| US6246153B1 (en) * | 1998-07-16 | 2001-06-12 | Face International Corp. | Positive feedback resonant transducer circuit |
| DE102012018740A1 (en) * | 2012-09-18 | 2014-03-20 | Reinhard Gerasch | Method for generating ultrasonic energy in pulse ultrasonic generator that is utilized for e.g. steam and heating boilers, involves ensuring operation of continuous oscillations with amplitude value of current oscillations |
| CN103401530A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | Impedance stepless matching network used for ultrasonic power supply and control method |
| CN103973262A (en) * | 2014-04-04 | 2014-08-06 | 华南理工大学 | Ultrasonic power source for transducer cascading |
| CN104811055A (en) * | 2015-04-22 | 2015-07-29 | 华南理工大学 | High power wideband ultrasonic power supply based on silicon carbide device and control method thereof |
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