CN108233745B - Ultrasonic power supply circuit - Google Patents
Ultrasonic power supply circuit Download PDFInfo
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- CN108233745B CN108233745B CN201810121563.4A CN201810121563A CN108233745B CN 108233745 B CN108233745 B CN 108233745B CN 201810121563 A CN201810121563 A CN 201810121563A CN 108233745 B CN108233745 B CN 108233745B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
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- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000003993 interaction Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 230000001131 transforming effect Effects 0.000 claims description 3
- 238000004148 unit process Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 8
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an ultrasonic power supply circuit which comprises a power conversion module, a driving control and display module and a sampling and protecting module, wherein the power conversion module is connected with the driving control and display module; the sampling and protecting module samples the voltage and current of the ultrasonic transducer in real time; the driving control and display module processes the sampling signals to obtain real-time output power and vibration frequency of the ultrasonic transducer, and sends the real-time output power and vibration frequency to the power conversion module; the power conversion module is used for controlling the output voltage of the ultrasonic power supply in real time and adjusting the output power of the ultrasonic transducer to be in a constant state; the power conversion module compensates and corrects the received vibration frequency in real time, so that the ultrasonic transducer keeps working in a resonance state. The invention controls the output voltage of the ultrasonic power supply and adjusts the output power of the ultrasonic transducer to be in a constant state; the vibration frequency of the ultrasonic transducer is compensated and corrected in real time, so that the ultrasonic transducer keeps working in a resonance state, and the reliability and stability of ultrasonic processing or welding are ensured.
Description
Technical Field
The invention relates to the technical field of ultrasonic power supplies, in particular to an ultrasonic power supply circuit.
Background
An ultrasonic power supply, also called an ultrasonic drive power supply or an ultrasonic generator, is a device for generating and supplying ultrasonic frequency electric energy to an ultrasonic transducer. Because the ultrasonic wave has good directivity and strong penetrating power, the concentrated acoustic energy is easy to obtain, and therefore, the ultrasonic wave has wider application in the fields of processing, welding, cleaning and the like.
The current ultrasonic power supply generally has the conditions of non-adjustable output power, limited bandwidth and the like, and the output power cannot be constant when the load changes, so that the working performance of the ultrasonic transducer is greatly reduced, and particularly when ultrasonic processing or welding is performed, the requirement on constant power is very high, and the processing or welding effect is directly influenced. Moreover, the vibration frequency of the ultrasonic transducer cannot be tracked and fed back in real time, so that the ultrasonic transducer cannot always work in a resonance state, and the power loss is serious.
Disclosure of Invention
The invention aims to solve the technical problems that the output power of the existing ultrasonic power supply is not adjustable, the output power is limited, the bandwidth is limited, the working performance of an ultrasonic transducer is affected, and the vibration frequency of the ultrasonic transducer cannot be tracked and fed back in real time, so that the ultrasonic transducer cannot always work in a resonance state, and the power loss is serious.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide an ultrasonic power supply circuit which comprises a power conversion module, a driving control and display module and a sampling and protecting module; the sampling and protecting module samples the voltage and current of the ultrasonic transducer in real time and sends the sampled voltage and current to the driving control and display module; the driving control and display module processes the received sampling signals to obtain real-time output power and vibration frequency of the ultrasonic transducer, and sends the real-time output power and vibration frequency to the power conversion module;
the power conversion module controls the output voltage of the ultrasonic power supply in real time according to the received output power of the ultrasonic transducer, and adjusts the output power of the ultrasonic transducer to be in a constant state; the power conversion module compensates and corrects the vibration frequency of the received ultrasonic transducer in real time, so that the ultrasonic transducer keeps working in a resonance state.
Preferably, the power conversion module comprises a single-phase full-bridge controllable rectifying unit, a filter, an IGBT high-frequency full-bridge inversion unit and a network matching unit, wherein the direct current passing through the single-phase full-bridge controllable rectifying unit is filtered by the filter to obtain stable direct current, the IGBT high-frequency full-bridge inversion unit processes the stable direct current to obtain square waves with required ultrasonic frequency, and the square waves are matched with the ultrasonic transducer through the network matching unit so as to meet power and resonance matching between an ultrasonic power supply and the ultrasonic transducer.
Preferably, the power conversion module further comprises a protection circuit RCD and a waveform conversion unit arranged between the network matching unit and the ultrasonic transducer, wherein the protection circuit RCD protects the IGBT high-frequency full-bridge inversion unit; the waveform transforming unit transforms Cheng Xianbo the square wave.
Preferably, the driving control and display module comprises an isolated DAC, an IGBT driving amplifying unit and a DSP controller;
Different level control signals sent by the DSP controller are output and stabilized by the isolated DAC and used for controlling the output voltage of the single-phase full-bridge controllable rectifying unit;
After the PWM wave sent by the DSP controller is amplified by the IGBT driving amplifying unit, the PWM wave is used for controlling the on and off of the IGBT high-frequency full-bridge inversion unit; the frequency of the PWM wave sent by the DSP controller is obtained through calculation after sampling and processing by the sampling and protecting module.
Preferably, the driving control and display module further comprises a PC communication unit, a man-machine interaction unit and an alarm indicator lamp, and the DSP controller is communicated with the PC through the PC communication unit; the man-machine interaction function is realized through a man-machine interaction unit; when the circuit fails, an alarm indicator lamp is lightened to send an alarm signal to an operator.
Preferably, the sampling and protecting module comprises a high-frequency voltage or current sampling tracking unit and a true effective value converter, wherein the high-frequency voltage or current sampling tracking unit samples the voltage and the current of the ultrasonic transducer in real time, sends a sampling signal to the true effective value converter for conversion, and inputs the obtained output power of the ultrasonic transducer to the DSP controller.
Preferably, the sampling and protecting module further comprises a circuit protecting unit and a phase discriminator, wherein the circuit protecting unit judges whether the circuit works normally or not and performs corresponding protection according to the conversion result of the true effective value converter; the phase discriminator analyzes and processes the sampling signal, judges whether the voltage and the current of the ultrasonic transducer are in phase, and feeds back the result to the DSP controller to control the sending of PWM waves.
Preferably, the system further comprises an auxiliary power supply module for supplying power to the drive control and display module and the sampling and protecting module, wherein the auxiliary power supply module comprises a rectifying and filtering unit and a flyback transformer, and the rectifying and filtering unit rectifies and filters the commercial power and then sends the commercial power to the flyback transformer; the flyback transformer adopts multipath output to supply power for the isolation type DAC, the DSP controller, the IGBT driving amplifying unit, the man-machine interaction unit, the true effective value converter, the phase discriminator and the high-frequency voltage or current sampling tracking unit.
The ultrasonic power supply circuit provided by the invention processes the sampled signals to obtain real-time output power and vibration frequency of the ultrasonic transducer through the voltage and current of the ultrasonic transducer obtained by sampling, controls the output voltage of the ultrasonic power supply in real time, and adjusts the output power of the ultrasonic transducer to be in a constant state; and compensating and correcting the received vibration frequency of the ultrasonic transducer in real time to ensure that the ultrasonic transducer keeps working in a resonance state, thereby ensuring the reliability and stability of ultrasonic processing or welding.
Drawings
FIG. 1 is a schematic diagram of a frame structure of an ultrasonic power supply circuit according to the present invention;
FIG. 2 is a schematic diagram of an IGBT full-bridge inverter circuit according to the invention;
FIG. 3 is a schematic diagram of an IGBT driving amplifying circuit in the invention;
Fig. 4 is a schematic diagram of a phase detector circuit according to the present invention.
Detailed Description
In order to solve the problems that the output power of the existing ultrasonic power supply is not adjustable, the output power is limited and the bandwidth is limited, and the vibration frequency of the ultrasonic transducer cannot be tracked and fed back in real time, so that the ultrasonic transducer cannot always work in a resonance state, and the power loss of the ultrasonic transducer is serious.
The embodiment of the invention provides an ultrasonic power supply circuit, which can adjust the output power of an ultrasonic power supply according to the requirement, can also meet the requirement of constant power in the working process, ensures that the output power of the ultrasonic power supply is constant, has stable amplitude, can track and feed back the output power and the vibration frequency of an ultrasonic transducer in real time, controls the output voltage of the ultrasonic power supply in real time, and adjusts the output power of the ultrasonic transducer to be in a constant state; the received vibration frequency of the ultrasonic transducer is compensated and corrected in real time, so that the ultrasonic transducer is ensured to keep working in a resonance state, the working performance of an ultrasonic power supply is improved, the output power is adjustable, the constant power and the stable amplitude are realized, and the ultrasonic transducer has the advantages of high efficiency, high stability and the like.
The invention is described in detail below with reference to the drawings and the detailed description.
The embodiment of the invention provides an ultrasonic power supply circuit, which is shown in fig. 1, and comprises a power conversion module 1, a driving control and display module 2 and a sampling and protecting module 4, wherein the sampling and protecting module 4 samples the voltage and current of an ultrasonic transducer in real time and sends the voltage and current to the driving control and display module 2; the driving control and display module 2 processes the received sampling signals to obtain real-time output power and vibration frequency of the ultrasonic transducer, and sends the real-time output power and vibration frequency to the power conversion module 1; the power conversion module 1 controls the output voltage of an ultrasonic power supply in real time according to the received output power of the ultrasonic transducer, and adjusts the output power of the ultrasonic transducer to be in a constant state; the power conversion module 1 compensates and corrects the vibration frequency of the received ultrasonic transducer in real time, so that the ultrasonic transducer keeps working in a resonance state.
The power conversion module 1 comprises a single-phase full-bridge controllable rectifying unit 10, a filter 11, an IGBT high-frequency full-bridge inversion unit 12, a protection circuit RCD13, a network matching unit 14 and a waveform conversion unit 15, wherein direct current passing through the single-phase full-bridge controllable rectifying unit 10 is filtered by the filter 11 to obtain stable direct current, the IGBT high-frequency full-bridge inversion unit 12 processes the stable direct current to obtain square waves with required ultrasonic frequency, and the square waves are matched with an ultrasonic transducer by the network matching unit 14 so as to meet power and resonance matching between an ultrasonic power supply and the ultrasonic transducer. The power conversion module 1 further comprises a protection circuit RCD13 and a waveform conversion unit 15 arranged between the network matching unit 14 and the ultrasonic transducer, wherein the protection circuit RCD13 protects the IGBT high-frequency full-bridge inverter unit 12; the waveform transforming unit 15 transforms Cheng Xianbo the square wave to reduce the influence of the voltage on the vibration stability of the ultrasonic transducer during the alternating process.
The driving control and display module 2 comprises an isolated DAC 20, an IGBT driving amplifying unit 21, a DSP controller 22, a PC communication unit 23, a man-machine interaction unit 24 and an alarm indicator lamp 25, wherein different level control signals sent by the DSP controller 22 are output and stabilized by the isolated DAC 20 and used for controlling the output voltage of the single-phase full-bridge controllable rectifying unit 10 so as to meet the requirements of different power and constant power; after the PWM wave sent by the DSP controller 22 is amplified by the IGBT driving amplifying unit 21, the IGBT (Insulated GateBipolar Transistor ) of the IGBT high-frequency full-bridge inverter unit 12 is controlled to be turned on and off; the frequency of the PWM wave sent by the DSP controller 22 is calculated after the sampling and protecting module 4 processes the PWM wave, and the working frequency is the resonant frequency of the ultrasonic transducer. The DSP controller 22 realizes communication with a PC through a PC communication unit 23; the human-computer interaction unit 24 is used for realizing the human-computer interaction function, the human-computer interaction unit 24 adopts a touch screen for display, and the frequency searching range can be adjusted by modifying parameters on the touch screen, so that the bandwidth is increased; when the circuit fails, the alarm indicator lamp 25 is turned on to send an alarm signal to the operator.
The sampling and protecting module 4 comprises a circuit protecting unit 41, a phase discriminator 42, a high-frequency voltage or current sampling tracking unit 43 and a true effective value converter 40, wherein the high-frequency voltage or current sampling tracking unit 43 samples the voltage and current of the ultrasonic transducer in real time, sends sampling signals to the true effective value converter 40 for conversion, and inputs the obtained output power of the ultrasonic transducer to the DSP controller 22, so that real-time tracking of the output power of the ultrasonic transducer and constant control of the power are realized, and the ultrasonic transducer is ensured to work in a resonance state. The circuit protection unit 41 judges whether the circuit works normally according to the conversion result of the true effective value converter 40, so that the hardware of the whole ultrasonic power supply is protected, and the conditions such as overcurrent and the like are prevented from burning or breaking down components; the phase discriminator 42 analyzes the sampled signal, collects the phase of the voltage and the current of the ultrasonic transducer, determines whether the voltage and the current of the ultrasonic transducer are in phase, and feeds back the result to the DSP controller 22 to control the transmission of the PWM wave, thereby ensuring that the ultrasonic transducer operates in a resonant state and improving the operation performance of the ultrasonic transducer.
The ultrasonic power supply circuit further comprises an auxiliary power supply module 3 for supplying power to the driving control and display module 2 and the sampling and protecting module 4, wherein the auxiliary power supply module 3 comprises a rectifying and filtering unit 30 and a flyback transformer 31, and the rectifying and filtering unit 30 rectifies and filters commercial power and then sends the commercial power to the flyback transformer 31; the flyback transformer 31 can reduce the volume and multiplex output, and supplies power to the isolated DAC 20, the DSP controller 22, the IGBT driving and amplifying unit 21, the man-machine interaction unit 24, the true effective value converter 40, the phase detector 42, the high-frequency voltage or current sampling and tracking unit 43, and the like.
The ultrasonic power supply circuit of the embodiment of the present invention is described in detail below.
The ultrasonic power supply circuit adopts alternating current commercial power, so that the ultrasonic power supply circuit has no too much limit on application occasions and has wide application range. After the power is electrified, the power is filtered by the power grid filter, so that the interference of the power grid to the power supply is filtered, and the power is respectively supplied to the power part and the auxiliary power part by two paths after the power is filtered by the power grid filter.
Firstly, the commercial power is rectified and filtered to obtain flyback switching power supply, and the commercial power is processed to obtain 5V, 12V, 24V and other paths of weak current which do not affect each other, so that the power supply is provided for chips and modules such as a touch screen, a DSP, a driving chip and the like.
The touch screen can display information such as frequency and power, can operate the information, realize man-machine interaction, the processing of signals is completed in the DSP controller, the DSP is a core control component of the whole power supply, the DSP can be communicated with the display screen, the PC, the alarm indicator lamp and the control voltage required by the PWM wave and full-control rectification module (the required voltage is obtained by conversion through the DAC chip after the digital signal is sent), and the signals such as phase difference and effective value fed back by sampling can be accepted, so that the real-time monitoring and control of the whole power supply are realized. The DAC control signal can be connected to the single-phase full-control rectification module after isolation, so that interference of strong current in the power circuit to weak current of the control circuit can be prevented, and errors of a main program or burning of the DAC and the DSP chip can be prevented.
The utility power coming out through the power grid filter also passes through the single-phase full-bridge controllable rectifying module, and the full-control rectifying module comes out as direct current with a plurality of alternating current components, so that filtering is needed first and then inversion can be carried out, and the inversion of the power supply adopts IGBT high-frequency H-bridge inversion, as shown in figure 2. Since IGBTs can develop spikes and overcurrents at the moment of switching. Therefore, if the processing is not performed, the phenomenon that the IGBT is broken down easily occurs, so in the present invention, four IGBTs of Q1, Q2, Q3, and Q4 are protected by using resistors R7, R8, R9, and R10, capacitors CBB1, CBB2, CBB3, CBB4, and fast recovery diodes D3, D4, D5, and D6 as shown in fig. 2, and the control terminals of the 4 IGBTs, that is, the 1 pin, is further provided with a driving resistor and a voltage regulator to limit current and voltage, so as to ensure stable operation of the IGBTs.
The PWM signals required by the on and off of the IGBT are directly given through a DSP chip, but the signal size given by the DSP is limited, the on and off of the IGBT cannot be driven, so that the PWM signals are required to be amplified and isolated to improve the driving capability and the isolation, as shown in an IGBT driving and amplifying circuit schematic diagram in FIG. 3, 4 paths of PWM signals buffer the signals through a U4 chip, so that the consistency of the signals can be ensured, U1 in FIG. 3 is a dial switch, the on and off of the U4 can be directly controlled through the DSP, the on and off of the U4 can also be manually controlled through the U1 dial switch, and U2 and U5 are two isolation chips, the front and back isolation of the PWM signals can be realized, the influence of a rear high-power circuit on a front control circuit is avoided, and the phenomenon that the strong motion control circuit is dead or burnt is prevented. For the isolated signal, the isolated signal can be given to the IGBT through one driving chip, U3 and U6 in FIG. 3 are two driving chips, one driving chip can process two paths of PWM waves, and the driving capability of the PWM waves can be improved by the driving chip.
In order to prevent the PWM wave from being wrong, the IGBT is turned on to be disordered, so that the circuit short circuit is burnt, 4 paths of PWM waves are judged through the U7 chip before the driving chip, and when the PWM error is judged, a 6 pin of the U7 chip signals to be fed into the U3 and U6 driving chips, so that the PWM signals are prevented from being continuously sent out, and the circuit is protected.
The H-bridge inverts out to be the required high frequency ac. The alternating current is square wave, and the current can be dithered at high frequency when the voltage of the square wave is exchanged, so the invention also carries out waveform transformation, and the current is more stable and the transducer can work more stably when the waveform is transformed into sine wave.
Because the working state and power of the transducer are required to be controlled and tracked in real time, the invention samples and tracks the high-frequency voltage and current of the transducer when the transducer is connected. Then, the sampled signals are respectively processed into two kinds of effective value conversion, and the effective value conversion is needed because the sampled signals are the same-proportion alternating current signals as the actual signals, so that the effective value conversion is needed, on one hand, the power is calculated, and on the other hand, the working state of the transducer can be judged according to the current effective value, and the working state of the transducer is detected. Another process is to perform phase qualification and pass the sampled signal through zero crossing comparison to a phase detector, such as the phase detector circuit shown in fig. 4. The square wave after zero crossing comparison obtains the phase difference between voltage and current after passing through the exclusive-or gate chips U8 and U12, the chip U10 is a trigger which can be used for judging which of the current and the voltage leads, then the lead is represented through a Q pin, the output signal of the U10 and the exclusive-or signals of the U8 and U12 can obtain the required phase difference signals through the AND gate chips U9 and U11, and then the signals are transmitted to the DSP controller to achieve the effect of real-time tracking, so that the transducer is ensured to work in a resonant state all the time, and the processing performance or the welding performance is improved.
The result converted from the effective value can be protected by under-voltage and over-voltage/current, and the work is in an invalid state when under-voltage/current is generated, and the result belongs to abnormal phenomenon, so that an alarm signal is given to the DSP controller, and an alarm is generated. Also, when overvoltage/current occurs, an alarm signal is given to the DSP controller for protecting the circuit and ensuring stability of processing, welding, etc. In addition, the temperature protection is realized by the signals acquired by the temperature sensor, and an alarm can be generated when the temperature is too high so as to ensure that the power supply can always be in a normal working state.
When the energy converter is connected to the power supply, the power switch is turned on, then the resonance point of the energy converter is found through the frequency searching process, namely the effective value of the sampled phase difference is calculated, the energy converter starts to work by sending PWM waves with corresponding frequency at the frequency of the resonance point after the frequency searching work is completed, the energy converter can continue to work in the working process, and the energy converter can shift the resonance point of the energy converter when the external environment changes, such as load or environmental temperature changes, at the moment, the frequency can be tracked by adopting the energy converter to ensure that the energy converter is always in the optimal resonance state, so that the energy converter can work stably and efficiently.
The ultrasonic power supply circuit provided by the invention can obtain the real-time output power of the ultrasonic generator after the voltage and the current of the ultrasonic transducer are obtained through sampling and conversion according to the true effective value, and then controls the output voltage of the ultrasonic power supply through the single-phase full-bridge controllable rectifying module to control the output power of the ultrasonic power supply in real time, so that the obtained power of the ultrasonic transducer is constant, and the reliability and the stability of ultrasonic processing or welding are ensured.
In addition, the phase of the voltage and the current obtained by sampling is identified and processed through the phase discriminator and fed back to the DSP controller, so that the current frequency can be effectively tracked and controlled in real time, the DSP controller judges the obtained signal and adjusts the output of PWM waves in real time until the voltage and the current are in the same phase, and the ultrasonic transducer can be ensured to work in a resonance state, namely, the state with the maximum amplitude, the highest efficiency and the best performance all the time.
The invention has the following advantages:
1. a single-phase full-bridge controllable rectifying module is adopted to meet the requirements of different powers and constant power;
2. The RCD overvoltage and overcurrent circuit protects the IGBT;
3. the vibration stability of the transducer is improved through waveform transformation;
4. The DSP is utilized for feedback control, so that frequency tracking is realized, and the working reliability and efficiency are improved;
5. Man-machine interaction, corresponding modification is carried out on each parameter, and the application range is improved;
6. Phase difference feedback is achieved by a phase detector circuit.
In the present invention, as applied to an ultrasonic transducer in rotation, a rotary transformer may be employed between the power supply and the ultrasonic transducer, but a matching capacitance needs to be added in between when in use.
The invention is not limited to the above-mentioned best mode, any structural change made by anyone under the teaching of the invention, and all technical schemes which are the same as or similar to the invention fall within the protection scope of the invention.
Claims (2)
1. An ultrasonic power supply circuit is characterized by comprising a power conversion module, a driving control and display module and a sampling and protecting module; the sampling and protecting module samples the voltage and current of the ultrasonic transducer in real time and sends the sampled voltage and current to the driving control and display module; the driving control and display module processes the received sampling signals to obtain real-time output power and vibration frequency of the ultrasonic transducer, and sends the real-time output power and vibration frequency to the power conversion module;
The power conversion module controls the output voltage of the ultrasonic power supply circuit in real time according to the received output power of the ultrasonic transducer, and adjusts the output power of the ultrasonic transducer to be in a constant state; the power conversion module compensates and corrects the vibration frequency of the received ultrasonic transducer in real time, so that the ultrasonic transducer keeps working in a resonance state;
The power conversion module comprises a single-phase full-bridge controllable rectifying unit, a filter, an IGBT high-frequency full-bridge inversion unit and a network matching unit, wherein direct current passing through the single-phase full-bridge controllable rectifying unit is filtered by the filter to obtain stable direct current, the IGBT high-frequency full-bridge inversion unit processes the stable direct current to obtain square waves with required ultrasonic frequency, and the square waves are matched with the ultrasonic transducer through the network matching unit so as to meet power and resonance matching between an ultrasonic power supply circuit and the ultrasonic transducer;
The driving control and display module comprises an isolated DAC, an IGBT driving amplifying unit and a DSP controller;
Different level control signals sent by the DSP controller are output and stabilized by the isolated DAC and used for controlling the output voltage of the single-phase full-bridge controllable rectifying unit;
After the PWM wave sent by the DSP controller is amplified by the IGBT driving amplifying unit, the PWM wave is used for controlling the on and off of the IGBT high-frequency full-bridge inversion unit; the frequency of the PWM wave sent by the DSP controller is obtained by calculation after sampling and processing by a sampling and protecting module;
The sampling and protecting module comprises a high-frequency voltage or current sampling tracking unit and a true effective value converter, wherein the high-frequency voltage or current sampling tracking unit samples the voltage and the current of the ultrasonic transducer in real time, sends a sampling signal to the true effective value converter for conversion, and inputs the obtained output power of the ultrasonic transducer to the DSP controller;
the sampling and protecting module further comprises a circuit protecting unit and a phase discriminator, wherein the circuit protecting unit judges whether the circuit works normally or not and performs corresponding protection according to the conversion result of the true effective value converter; the phase discriminator analyzes and processes the sampling signal, judges whether the voltage and the current of the ultrasonic transducer are in phase or not, and feeds back the result to the DSP controller to control the sending of PWM waves;
the power conversion module further comprises a protection circuit RCD and a waveform conversion unit arranged between the network matching unit and the ultrasonic transducer, wherein the protection circuit RCD protects the IGBT high-frequency full-bridge inversion unit; the waveform transforming unit transforms Cheng Xianbo the square wave;
The driving control and display module further comprises a PC communication unit, a man-machine interaction unit and an alarm indicator lamp, and the DSP controller is communicated with the PC through the PC communication unit; the man-machine interaction function is realized through a man-machine interaction unit; when the circuit fails, an alarm indicator lamp is lightened to send an alarm signal to an operator.
2. The ultrasonic power supply circuit of claim 1, further comprising an auxiliary power supply module for supplying power to the drive control and display module and the sampling and protection module, wherein the auxiliary power supply module comprises a rectifying and filtering unit and a flyback transformer, and the rectifying and filtering unit rectifies and filters commercial power and sends the commercial power to the flyback transformer; the flyback transformer adopts multipath output to supply power for the isolation type DAC, the DSP controller, the IGBT driving amplifying unit, the man-machine interaction unit, the true effective value converter, the phase discriminator and the high-frequency voltage or current sampling tracking unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121563.4A CN108233745B (en) | 2018-02-07 | 2018-02-07 | Ultrasonic power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121563.4A CN108233745B (en) | 2018-02-07 | 2018-02-07 | Ultrasonic power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108233745A CN108233745A (en) | 2018-06-29 |
| CN108233745B true CN108233745B (en) | 2024-07-09 |
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| CN111193437B (en) * | 2018-11-15 | 2022-04-12 | 北京自动化控制设备研究所 | Ultrasonic motor LC resonance matching circuit with feedback loop |
| CN110401375B (en) * | 2019-07-29 | 2020-11-24 | 西南科技大学 | High-voltage piezoelectric ceramic driving power supply and control method |
| CN111817711B (en) * | 2020-07-09 | 2024-01-30 | 杭州国彪超声设备有限公司 | Frequency tracking method of ultrasonic processing system |
| CN111865110B (en) * | 2020-08-13 | 2022-04-19 | 广州道一科学技术有限公司 | Electrophoresis power supply |
| CN113904569A (en) * | 2021-10-20 | 2022-01-07 | 杭州茂葳科技有限公司 | Ultrasonic drive circuit |
| CN113985795A (en) * | 2021-11-26 | 2022-01-28 | 广东亲太智能厨电有限公司 | Intelligent digital dry-burning-resistant ultrasonic device |
| CN114362550B (en) * | 2021-12-29 | 2024-08-20 | 广州市昊志机电股份有限公司 | Ultrasonic power supply device and control method thereof |
| CN114653565B (en) * | 2022-03-25 | 2023-04-21 | 广州市弘健生物医用制品科技有限公司 | Ultrasonic biological material welding machine circuit and self-adaptive resonant circuit |
| CN116667275B (en) * | 2023-07-28 | 2024-06-18 | 深圳洁盟技术股份有限公司 | Intelligent matrix type medical cleaning system equipment overcurrent protection system |
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| US4973876A (en) * | 1989-09-20 | 1990-11-27 | Branson Ultrasonics Corporation | Ultrasonic power supply |
| US5777860A (en) * | 1996-10-16 | 1998-07-07 | Branson Ultrasonics Corporation | Ultrasonic frequency power supply |
| CN202306225U (en) * | 2011-10-17 | 2012-07-04 | 重庆海扶(Hifu)技术有限公司 | Constant-power switching power supply, ultrasonic transducer and ultrasonic therapeutic system |
| CN103199712A (en) * | 2013-03-14 | 2013-07-10 | 然斯康波达机电设备(深圳)有限公司 | Ultrasonic cleaning power system |
| CN104549979B (en) * | 2014-12-29 | 2017-08-04 | 东莞市优超精密技术有限公司 | Based on phase-shifting full-bridge high-power ultrasound generator |
| CN107623452B (en) * | 2017-10-19 | 2019-11-08 | 武汉理工大学 | A kind of ultrasonic power and control method |
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| CN207910698U (en) * | 2018-02-07 | 2018-09-25 | 广州市昊志机电股份有限公司 | A kind of ultrasonic power circuit |
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