CN103302055A - Variable-frequency ultrasonic system based on digital pulse driving - Google Patents
Variable-frequency ultrasonic system based on digital pulse driving Download PDFInfo
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- CN103302055A CN103302055A CN2013102547827A CN201310254782A CN103302055A CN 103302055 A CN103302055 A CN 103302055A CN 2013102547827 A CN2013102547827 A CN 2013102547827A CN 201310254782 A CN201310254782 A CN 201310254782A CN 103302055 A CN103302055 A CN 103302055A
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Abstract
The invention relates to the technical field of ultrasonic applications, in particular to a variable-frequency ultrasonic system based on digital pulse driving. The system comprises an ultrasonic generator, an ultrasonic transducer and an ultrasonic wave field action groove, wherein the ultrasonic generator is a variable-frequency ultrasonic generator based on a DDS (Direct Digital Synthesis) technology, and comprises a power supply, a singlechip, a frequency generation module, a power amplification module, a PLL (Phase Locked Loop) frequency feedback module and an input-output module; the ultrasonic transducer is a transduction module consisting of a plurality of ultrasonic transduction units; each ultrasonic transduction unit comprises a piezoelectric sheet, conducting resin, a sound absorption material, a conducting post, a wiring board, a check ring and a housing; the ultrasonic transducer is fixed on a base, and electrically connected with the ultrasonic generator; and the ultrasonic wave field action groove is formed at the upper end of the ultrasonic transducer. The system is reasonable in design, and adopts the digital pulse driving; the frequency is automatically tracked, and is stepless and adjustable; the control is flexible; the power loss is low; the output is stable; and the system is suitable for various ultrasonic application environments.
Description
Technical field
The present invention relates to technical field of ultrasonic application, the variable-frequency ultrasonic system that especially drives based on digit pulse.
Background technology
Supersonic generator is commonly referred to ultrasonic wave electronic box, ultrasonic wave generating source, ultrasonic power.Its effect is that the civil power (220V or 380V, 50 or 60Hz) us converts the high-frequency ac signal of telecommunication that is complementary with ultrasonic transducer to.
The principle of generator is the signal that is at first produced a CF by signal generator, this signal can be sinusoidal signal, it also can be pulse signal, this CF is exactly the frequency of transducer, and the ultrasonic frequency that generally is applied in the ultrasonic equipment is 20KHz, 25KHz, 28KHz, 33KHz, 40KHz, 60KHz; 100KHz or above now not yet in a large number use.The supersonic generator of selling in the market is a lot, but the general few of difference of principle and parameter generally is the independent-excited supersonic generator.This generator only possesses a kind of frequency, such as the generator of having selected 25KHz, just can only mate the transducer of 25KHz, can only produce the ultrasonic wave of 25KHz, and the frequency match of generator and transducer can not be above 2%, like this, along with the loss of transducer, need to change transducer.
This supersonic generator advantage is, and is simple to operate, easily safeguard, low price, thus can not frequency modulation on the market, or two frequently, Three-frequency ultrasonic cleaning machine uses all is this supersonic generator, shortcoming is that frequency can not be regulated continuously.Owing to wanting to study hyperacoustic frequency to the impact of emulsification, degassed, dedusting, scale removal, cleaning, sterilization effect, so require the frequency of generator preferably can be adjustable continuously.The design supersonic generator is to improve at original generator and basis, makes it have frequency modulation function.This supersonic generator is seldom made by producer on the market, even be because made this generator, do not have can frequency modulation transducer, have little significance.
Summary of the invention
The objective of the invention is provides the variable-frequency ultrasonic system that drives based on digit pulse in order to overcome above-mentioned technical disadvantages.
The technical scheme that technical solution problem of the present invention adopts is: the variable-frequency ultrasonic system based on digit pulse drives comprises supersonic generator, ultrasonic transducer and ultrasound waves field action groove; Supersonic generator is the variable-frequency ultrasonic generator based on the DDS technology, comprises power supply, single-chip microcomputer, frequency generation module, power amplifier module, PLL frequency feedback module and input/output module; Ultrasonic transducer is the transducing module that many group ultrasonic wave transducers unit forms, and the ultrasonic wave transducer unit comprises piezoelectric patches, conducting resinl, sound-absorbing material, conductive pole, terminal plate, back-up ring and shell; Ultrasonic transducer is fixed on the base, and is electrically connected with supersonic generator, and described ultrasound waves field action groove places the ultrasonic transducer upper end, and solvent and experiment cup are housed in the groove;
Described power supply connects respectively single-chip microcomputer, frequency generation module, power amplifier module and PLL frequency feedback module, described single-chip microcomputer and input/output module, frequency generation module, power amplifier module are electrically connected, and connect the external ultrasound wave transducer by PLL frequency feedback module.
Described enclosure is divided into the wire connection cavity of upper end and the piezoelectricity chamber of lower end, bottom, piezoelectricity chamber is provided with conducting resinl, the conducting resinl upper end connects piezoelectric patches, be enclosed with sound-absorbing material around the described piezoelectric patches, piezoelectric patches is by the terminal plate in the conductive pole connection wire connection cavity, described terminal plate upper end is provided with back-up ring, connects the external signal cable by wire.
Single-chip microcomputer on the described supersonic generator is the ACR integrated chip piece based on DDS, also is integrated with band pass filter circuit and signal generating circuit on the ACR integrated chip piece.
Piezoelectric patches on the described ultrasonic transducer is the ANN-P5F-1001 piezoelectric patches, the conductive pole coupling that piezoelectric patches is made by high-temperature electric conduction glue and copper product, and high-temperature electric conduction glue is preferably DB5015.
Sound-absorbing material in the described ultrasonic transducer is preferably the S2116 high resiliency electron pouring sealant of two components, and sound-absorbing material is filled in the back side of piezoelectric patches, is used for absorbing and suppressing the reversal of vibrations ripple of piezoelectric patches.
Described terminal plate be through the hole, the double face copper that gold-plated, wiring is processed, the terminal plate buffering connects piezoelectric patches and external signal cable, protects piezoelectric patches not to be subjected to the impact of cable welding stress.
Described back-up ring is and the packing ring standard component of the suitable cover of wire connection cavity inner thread, is used for fixing terminal plate.
Described external signal cable adopts 2 * 0.2mm
2The multiply high temperature resistant flexible cable, the outside diameter of cable is 3～3.5mm approximately, bending radius is greater than 6mm, the external signal cable adopts the embedding of high-temperature electric conduction glue to meeting the IP68 level of protection.
The principle of technical solution of the present invention is:
One, supersonic generator is realized the Frequency Adjustable function
The present invention adopts AVR chip single-chip microcomputer, adopts the encapsulation of DIP40 straight cutting, realizes the Frequency Adjustable function of supersonic generator.
AVR chip single-chip microcomputer adopts Direct Digital frequency synthesis (DDS) and band pass filter circuit thereof, DDS is a kind of according to frequency and the phase place adjustable a kind of technology of input digit amount generation with respect to reference frequency, have the advantages such as high speed, high accuracy, constant temperature output and flexible frequency conversion, fast reaction, but its output frequency harmonic frequency is more, therefore add good filtration module at the DDS output, can reduce the spurious signal of DDS, improve signal to noise ratio.
Because the operating frequency of system is lower than 200kHz, so low pass filter adopts active structure, is preferably 2 rank Butterworth filter devices of Salleft-Key topological structure, and adopts RC high-pass filter filtering flip-flop in rear class.
The digital to analog converter of foregoing circuit, preferred DDS model is the digital to analog converter of AD9835BRUZ.
The output voltage of DDS chip only has the hundreds of millivolt, this voltage can not drive transducer work, this is the problem that single-frequency on the market, double frequency, Three-frequency ultrasonic system do not run into, in order to address this problem, need circuit that DDS chip power output is amplified an amplification of design, the preferred AB class of the present invention power amplifier.
This circuit needs fixed value resistance and the electric capacity of various models, and resistance is selected the braid fixed carbon resister, capacitance selection electric capacity of the dacron 2A104J (220V104J) 0.1UF.
When above-mentioned power amplifier loads different impedance, do not affect the output voltage of power amplifier.Simultaneously, based on AVR chip phase locked algorithm fast and effectively, capable of dynamic guarantees that transducer is in resonant condition.Therefore solved the demand that the conventional ultrasound wave producer must carry out to system impedance matching.Because this design need not impedance matching, has strengthened versatility and the convenience of variable frequency type ultrasonic generator, has satisfied the designing requirement that drives different Bonding transducers.
Communicate by letter with the SPI of AD9835BRUZ by the AVR chip, supersonic generator can the very high frequency of linear generating precision, and by the feedback signal of transducer, single-chip microcomputer can generate corresponding frequency according to setting needs and phase locked algorithm control DDS.Simultaneously, because DDS can be at an internal linear generated frequency in a big way, thereby can drive transducer at different frequency range, also namely realize the effect of frequency conversion.
Two, ultrasonic transducer is realized the frequency-tracking function
The piezoelectric-type ultrasonic wave transducer utilizes the piezo-electric effect principle work of piezoelectric patches, when ultrasonic wave is launched oscillator (transducer) when passing to electric impulse signal, because the mechanical oscillation meeting of oscillator produces ultrasonic signal, therefore can propagate in solid and fluid, ultrasonic frequency depends on the natural resonance frequency of oscillator.
The present invention selects the ANN-P5F-1001 piezoelectric patches, by DB5015 high-temperature electric conduction glue and conductive pole coupling, when bonding or welding conductive pole, piezoelectric patches should be fixed on the anchor clamps, and guarantee that conductive pole and piezoelectric patches keep vertical and concentric, centre deviation ± 0.1mm.
The back side filling sucting sound material of piezoelectric patches is for the reversal of vibrations ripple that absorbs and suppress piezoelectric vibrator, to obtain pure pulse transmitted waveform.Absorbing material is the S2116 high resiliency electron pouring sealant that adopts two components.
Terminal plate is used for the buffer connecting rods between piezoelectric patches and the cable; be not subjected to the impact of cable welding stress with the protection piezoelectric patches; terminal plate adopts the double face copper of thickness 1mm to make; wiring is processed by drawing; the centre bore of terminal plate cooperates crimping with conductive pole, adopts hole, gold-plated processing.
Back-up ring is used for fixing terminal plate.Back-up ring adopts standard component, its external diameter should with housing upper chamber inner thread movingly, but precession install, installing needs to adopt special caliper.
After above assembling parts and the test passes, weld outside stube cable and adopt the electronic pastes embedding, to reach the IP68 level of protection, cable adopts 2 * 0.2mm
2The multiply high temperature resistant flexible cable, the outside diameter of cable is 3～3.5mm approximately, bending radius is greater than 6mm.
Be provided with power amplification circuit on the ultrasonic transducer, under the condition that guarantees the transistor trouble free service and in the scope of permission distortion, give full play to its potentiality, export the large power of trying one's best, also to reduce simultaneously the loss of pipe, to improve its efficient, power amplification circuit adopts signal source---preamplifier---power amplifier---load transducer architecture.
Three, realize ultrasonic applications by ultrasound waves field action groove
Study the fouling situation in the pipeline, because tube wall is superfine, ultrasonic transducer can't be bonded on the tube wall, can not realize ultrasound wave descaling, if ultrasonic transducer is placed directly in the water, consider proof anti-scaling and the problem of rustiness of transducer; In addition, because transducer is placed directly in the water, do not have fixed support, and connecting line is to flexibly connect, its amplitude is weakened, can weaken descaling function.
The form of the preferred ultrasonic cleaner of the present invention.
Beneficial effect of the present invention: the present invention adopts the digit pulse mode to drive; volume is little, lightweight, power is powerful; working stability is reliable; power is adjustable continuously; control the advantages such as flexible; by the frequency-swept realization of transducer and working in coordination with of supersonic generator; guaranteed that more machine all is in the best duty from the beginning to the end; can bring into play to greatest extent the potential of ultrasonic transducer; have perfect overtemperature protection, output short circuit protection function; be applicable to the application demand of multiple environment, have splendid marketing application prospect.
Description of drawings
Accompanying drawing 1 is structural representation of the present invention.
Accompanying drawing 2 is supersonic generator structural representation of the present invention.
Accompanying drawing 3 is ultrasonic wave transducer cellular construction schematic diagram of the present invention.
Accompanying drawing 4 is supersonic generator DDS of the present invention and band pass filter circuit figure thereof.
Accompanying drawing 5 is supersonic generator AB class topological structure power amplification circuit figure of the present invention.
Accompanying drawing 6 is the frequency-tracking functional circuit of supersonic generator of the present invention.
Accompanying drawing 7 is the power amplification circuit figure of ultrasonic transducer of the present invention.
Accompanying drawing 8 is ultrasonic transducer FM circuit figure of the present invention.
The specific embodiment
8 couples of the present invention do following detailed description below in conjunction with accompanying drawing 1～accompanying drawing.
Such as Fig. 1～shown in Figure 8, the present invention includes supersonic generator 1, ultrasonic transducer 3 and ultrasound waves field action groove 5; Supersonic generator 1 is the variable-frequency ultrasonic generator based on the DDS technology, comprise power supply 11, single-chip microcomputer 12, frequency generation module 15, power amplifier module 16, PLL frequency feedback module 18 and and input/output module 13; Ultrasonic transducer 3 is the transducing module that many group ultrasonic wave transducers unit forms, and the ultrasonic wave transducer unit comprises piezoelectric patches 38, conducting resinl 39, sound-absorbing material 37, conductive pole 36, terminal plate 33, back-up ring 34 and shell 31; Ultrasonic transducer 3 is fixed on the base 2, and is electrically connected with supersonic generator 1, and described ultrasound waves field action groove 5 places ultrasonic transducer 3 upper ends, and solvent 4 and experiment cup are housed in the groove;
Described power supply 11 connects respectively single-chip microcomputer 12, frequency generation module 15, power amplifier module 16, PLL frequency feedback module 18 and input/output module 13, described single-chip microcomputer 12 is electrically connected with input/output module 13, frequency generation module 15, power amplifier module 16, and connects external ultrasound wave transducer 17 by PLL frequency feedback module 18.
Described shell 31 interior separations are the wire connection cavity of upper end and the piezoelectricity chamber of lower end, bottom, piezoelectricity chamber is provided with conducting resinl 39, conducting resinl 39 upper ends connect piezoelectric patches 38, be enclosed with sound-absorbing material 37 around the described piezoelectric patches 38, the terminal plate 33 that piezoelectric patches 38 connects in the wire connection cavity by conductive pole 36, described terminal plate 33 upper ends are provided with back-up ring 34, connect external signal cable 35 by wire.
Single-chip microcomputer 12 on the described supersonic generator 1 is the ACR integrated chip piece based on DDS, also is integrated with band pass filter circuit and signal generating circuit on the ACR integrated chip piece.
Sound-absorbing material 37 in the described ultrasonic transducer 3 is preferably the S2116 high resiliency electron pouring sealant of two components, and sound-absorbing material 37 is filled in the back side of piezoelectric patches 38, is used for absorbing and suppressing the reversal of vibrations ripple of piezoelectric patches 38.
Described terminal plate 33 be through the hole, the double face copper that gold-plated, wiring is processed, terminal plate 33 bufferings connect piezoelectric patches 38 and external signal cables 35, protection piezoelectric patches 38 is not subjected to the impact of cable welding stress.
Described back-up ring 34 is and the packing ring standard component of the suitable cover of wire connection cavity inner thread, is used for fixing terminal plate 33.
Described external signal cable 35 adopts 2 * 0.2mm
2The multiply high temperature resistant flexible cable, the outside diameter of cable is 3～3.5mm approximately, bending radius is greater than 6mm, external signal cable 35 adopts the embeddings of high-temperature electric conduction glue to meeting the IP68 level of protection.
Claims (9)
1. the variable-frequency ultrasonic system that drives based on digit pulse is characterized in that: comprise supersonic generator, ultrasonic transducer and ultrasound waves field action groove;
Supersonic generator is the variable-frequency ultrasonic generator based on the DDS technology, comprises power supply, single-chip microcomputer, frequency generation module, power amplifier module, PLL frequency feedback module and input/output module;
Ultrasonic transducer is the transducing module that many group ultrasonic wave transducers unit forms, and the ultrasonic wave transducer unit comprises piezoelectric patches, conducting resinl, sound-absorbing material, conductive pole, terminal plate, back-up ring and shell;
Ultrasonic transducer is fixed on the base, and is electrically connected with supersonic generator, and described ultrasound waves field action groove places the ultrasonic transducer upper end, and solvent and experiment cup are housed in the groove.
2. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1, it is characterized in that: described power supply connects respectively single-chip microcomputer, frequency generation module, power amplifier module, PLL frequency feedback module and input/output module, described single-chip microcomputer and input/output module, frequency generation module, power amplifier module are electrically connected, and connect the external ultrasound wave transducer by PLL frequency feedback module.
3. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1, it is characterized in that: described enclosure is divided into the wire connection cavity of upper end and the piezoelectricity chamber of lower end, bottom, piezoelectricity chamber is provided with conducting resinl, the conducting resinl upper end connects piezoelectric patches, be enclosed with sound-absorbing material around the described piezoelectric patches, piezoelectric patches is by the terminal plate in the conductive pole connection wire connection cavity, and described terminal plate upper end is provided with back-up ring, connects the external signal cable by wire.
4. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1, it is characterized in that: the single-chip microcomputer on the described supersonic generator also is integrated with band pass filter circuit and signal generating circuit for the ACR integrated chip piece based on DDS on the ACR integrated chip piece.
5. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1, it is characterized in that: the piezoelectric patches on the described ultrasonic transducer is the ANN-P5F-1001 piezoelectric patches, the conductive pole coupling that piezoelectric patches is made by high-temperature electric conduction glue and copper product, high-temperature electric conduction glue is preferably DB5015.
6. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1, it is characterized in that: the sound-absorbing material in the described ultrasonic transducer, be preferably the S2116 high resiliency electron pouring sealant of two components, sound-absorbing material is filled in the back side of piezoelectric patches, is used for absorbing and suppressing the reversal of vibrations ripple of piezoelectric patches.
7. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1; it is characterized in that: described terminal plate for through the hole, the double face copper of gold-plated, wiring processing; the terminal plate buffering connects piezoelectric patches and external signal cable, and the protection piezoelectric patches is not subjected to the impact of cable welding stress.
8. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 1 is characterized in that: described back-up ring for and the packing ring standard component of the suitable cover of wire connection cavity inner thread, be used for fixing terminal plate.
9. the variable-frequency ultrasonic system that drives based on digit pulse according to claim 3 is characterized in that: described external signal cable employing 2 * 0.2mm
2The multiply high temperature resistant flexible cable, the outside diameter of cable is 3～3.5mm approximately, bending radius is greater than 6mm, the external signal cable adopts the embedding of high-temperature electric conduction glue to meeting the IP68 level of protection.
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| CN104117478A (en) * | 2014-08-10 | 2014-10-29 | 哈尔滨理工大学 | System and method for transmitting ultrasonic waves at variable frequency |
| CN105571686A (en) * | 2015-12-08 | 2016-05-11 | 陕西声科电子科技有限公司 | Doppler ultrasonic level gauge |
| CN105855156A (en) * | 2016-05-19 | 2016-08-17 | 潍坊金昌源电子有限公司 | Ultrasonic generating device for household cleaning |
| CN104117478B (en) * | 2014-08-10 | 2016-11-30 | 哈尔滨理工大学 | A kind of System and method for realizing ultrasound wave frequency conversion transmitting |
| CN107303573A (en) * | 2016-04-21 | 2017-10-31 | 国家开发投资公司 | The cleaning method and device of a kind of bioreactor |
| CN108656484A (en) * | 2018-06-29 | 2018-10-16 | 天津市众禾高科技有限公司 | A kind of screw injection device |
| CN111225727A (en) * | 2017-07-26 | 2020-06-02 | 弗洛设计声能学公司 | Automatic starting and running of acoustic transducer |
| CN115262288A (en) * | 2022-07-19 | 2022-11-01 | 永发（江苏）模塑包装科技有限公司 | Ultrasonic-enhanced dehydration mold for pulp molding and use method |
| CN117531681A (en) * | 2023-10-18 | 2024-02-09 | 深圳艾摩米智能科技有限公司 | Ultrasonic transducer driving circuit |
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| CN115262288A (en) * | 2022-07-19 | 2022-11-01 | 永发（江苏）模塑包装科技有限公司 | Ultrasonic-enhanced dehydration mold for pulp molding and use method |
| CN117531681A (en) * | 2023-10-18 | 2024-02-09 | 深圳艾摩米智能科技有限公司 | Ultrasonic transducer driving circuit |
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