CN213817614U - Power supply circuit capable of effectively improving welding effect of ultrasonic mask - Google Patents
Power supply circuit capable of effectively improving welding effect of ultrasonic mask Download PDFInfo
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Abstract
The utility model belongs to the technical field of the ultrasonic drive power supply technique and specifically relates to a effectively improve power supply circuit of ultrasonic wave gauze mask welding effect, including rectifier circuit, power control circuit, power vary voltage circuit and ultrasonic transducer, outside commercial power is connected to rectifier circuit's input, and the parallel connection has compensation capacitance on rectifier circuit's the output, and power control circuit's power input end is connected with rectifier circuit's output, and power vary voltage circuit includes transformer and inductance coils, and power control circuit includes controller, sampling circuit and inverter control circuit, the utility model discloses can automatic tracking frequency when load resonant frequency changes, have advantages such as power is big, efficient, the interference killing feature is strong, job stabilization is reliable.
Description
Technical Field
The utility model relates to an ultrasonic drive power supply technical field, concrete field is a power supply circuit who effectively improves ultrasonic wave gauze mask welding effect.
Background
The traditional ultrasonic mask welding power supply adopts an oscillator to generate a high-frequency signal, generates ultrasonic waves after power amplification, regards the transducer as a capacitive load, and does not consider the adverse effects of the charge and discharge process and other dynamic characteristics on the power supply, which are generated by the expansion and contraction of piezoelectric ceramics when the transducer works normally.
The transistor works in a nonlinear region, has large loss, not very high frequency, poor working stability and poor starting capability, can not realize frequency tracking, can not adapt to the change of load caused by heating and loss, can not lead the transducer to be in a resonance state any more, can not realize high power and has poor efficiency and precision.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a power supply circuit who effectively improves ultrasonic wave gauze mask welding effect can be at load resonant frequency automatic tracking frequency when changing, has advantages such as power is big, efficient, the interference killing feature is strong, job stabilization is reliable.
In order to achieve the above object, the utility model provides a following technical scheme: a power supply circuit for effectively improving the welding effect of an ultrasonic mask, which comprises a rectifying circuit, a power control circuit, a power transformer circuit and an ultrasonic transducer,
the input end of the rectifying circuit is connected with an external commercial power, the output end of the rectifying circuit is connected with a compensation capacitor in parallel, the positive end of the compensation capacitor is connected with the positive output end of the rectifying circuit, and the negative end of the compensation capacitor is connected with the negative output end of the rectifying circuit;
the power supply input end of the power control circuit is connected with the output end of the rectifying circuit;
the power supply transformation circuit comprises a transformer and an inductance coil, wherein the input side of the transformer is connected with the power supply output end side of the power control circuit, the output side of the transformer is connected with the power supply end of the ultrasonic transducer, and the inductance coil is connected in series between the output side of the transformer and the power supply end of the ultrasonic transducer;
the power control circuit comprises a controller, a sampling circuit and an inversion control circuit, wherein the power input end of the inversion control circuit is connected with the output end of the rectification circuit, the power output end of the inversion control circuit is connected with the input side of the transformer, the sampling end of the sampling circuit is connected with the power supply end of the ultrasonic transducer, the output end of the sampling circuit is connected with the output end of the controller, and the output end of the controller is connected with the control end of the inversion control circuit.
Preferably, the rectification circuit is a single-phase bridge rectifier.
Preferably, the inverter control circuit comprises an IGBT transistor I, an IGBT transistor II, an IGBT transistor III, an IGBT transistor IV, a diode I, a diode II, a diode III, a diode IV, a resonance capacitor I, a resonance capacitor II, a resonance capacitor III and a resonance capacitor IV,
a first diode and a first resonant capacitor are connected to the first IGBT transistor in parallel, the positive end of the first diode is connected with the output end of the first IGBT transistor, and the negative end of the first diode is connected with the input end of the first IGBT transistor;
a second diode and a second resonant capacitor are connected in parallel to the second IGBT transistor, the positive end of the second diode is connected with the output end of the second IGBT transistor, and the negative end of the second diode is connected with the input end of the second IGBT transistor;
a third diode and a third resonant capacitor are connected in parallel to the third IGBT transistor, the positive end of the third diode is connected with the output end of the third IGBT transistor, and the negative end of the third diode is connected with the input end of the third IGBT transistor;
a fourth diode and a fourth resonant capacitor are connected in parallel to the fourth IGBT transistor, the positive end of the fourth diode is connected with the output end of the fourth IGBT transistor, and the negative end of the fourth diode is connected with the input end of the fourth IGBT transistor;
the input ends of the IGBT transistor I and the IGBT transistor III are connected with the positive output end of the rectifying circuit, the output ends of the IGBT transistor II and the IGBT transistor IV are connected with the negative output end of the rectifying circuit, the output end of the IGBT transistor I is connected with the input end of the IGBT transistor II, and the output end of the IGBT transistor III is connected with the input end of the IGBT transistor IV;
the output end of the IGBT transistor I is connected with the negative electrode input end of the transformer, and the output end of the IGBT transistor III is connected with the positive electrode input end of the transformer.
Preferably, the sampling circuit is a voltage-current sampler, and a sampling end of the voltage-current sampler is connected with a voltage input end of the ultrasonic transducer.
Preferably, the controller includes the phase discriminator, voltage controlled oscillator, the wave filter, the DSP controller, sampling circuit's sampling signal output part and voltage controlled oscillator's signal output part are connected with the input of phase discriminator respectively, the output of phase discriminator is connected with the input of wave filter, the output of wave filter is connected with voltage controlled oscillator's input, the input of DSP controller is connected with the phase discriminator respectively, voltage controlled oscillator and sampling circuit's signal output part, the output of DSP controller is connected with IGBT transistor one respectively, IGBT transistor two, IGBT transistor three and IGBT transistor four's control end.
Preferably, the controller further comprises a display control module, the display control module comprises a display screen and an input key, the signal output end of the DSP controller is connected with the input end of the display screen, and the input key is connected with the input end of the DSP controller.
Preferably, the compensation capacitor is an electrolytic capacitor.
Preferably, the DSP controller is a TMS320F2812 type DSP processor.
Compared with the prior art, the beneficial effects of the utility model are that: the power supply circuit of the utility model can automatically track the frequency when the load resonance frequency changes, and has the advantages of high power, high efficiency, strong anti-interference capability, stable and reliable work and the like;
the power device is switched on at zero voltage by adopting a full-bridge inversion topological structure and taking an IGBT (insulated gate bipolar transistor) as an inversion bridge arm through the conduction of an anti-parallel diode of the transistor, and the zero voltage switching-off of the power device is realized through the charging process of a power resonance capacitor, so that the field effect transistor works in a soft switching state, and the power device has the characteristics of small loss and high efficiency, can bear high-power output and is convenient for digital control;
the method of serially connecting an inductor Ls at the end of the transducer is adopted to carry out capacitive reactance compensation on the transducer circuit, so that the load of the ultrasonic power supply is close to pure resistance, and the power factor of the circuit is increased;
a phase-shifting control strategy is adopted, a complementary PWM wave with dead zone control is generated by a DSP, and when a phase shifting angle is continuously changed, the pulse width of an output voltage is changed along with the phase shifting angle, so that the continuous regulation of the output power of the ultrasonic power supply is realized;
the constant power output of the ultrasonic power supply is realized by adjusting the phase shift angle alpha, when the ultrasonic power supply works stably, load voltage and current are sampled, feedback power is obtained through DSP calculation, power difference is obtained through comparison with given power, the power controller adjusts the output power according to the power difference, and finally the output power is stabilized around the given power, so that the constant power control of the ultrasonic power supply is realized.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a block flow diagram of the present invention.
In the figure: 1. a rectifying circuit; 2. a power control circuit; 3. a power supply voltage transformation circuit; 4. an ultrasonic transducer; 5. a controller; 6. a sampling circuit; 7. an inverter control circuit; 8. a phase discriminator; 9. a voltage controlled oscillator; 10. a filter; 11. a DSP controller; 12. a display control module; 13. a display screen; 14. inputting a key; 15. a compensation capacitor; 16. an inductor coil; 17. an IGBT transistor I; 18. an IGBT transistor II; 19. an IGBT transistor III; 20. an IGBT transistor IV; 21. a first diode; 22. a second diode; 23. A diode III; 24. a fourth diode; 25. a first resonance capacitor; 26. a second resonance capacitor; 27. a third resonant capacitor; 28. a resonant capacitor IV; 29. a transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a technical solution: a power supply circuit for effectively improving the welding effect of an ultrasonic mask, which comprises a rectifying circuit, a power control circuit, a power transformer circuit and an ultrasonic transducer,
the input end of the rectifying circuit is connected with an external commercial power, the output end of the rectifying circuit is connected with a compensation capacitor in parallel, the positive end of the compensation capacitor is connected with the positive output end of the rectifying circuit, and the negative end of the compensation capacitor is connected with the negative output end of the rectifying circuit;
the power supply input end of the power control circuit is connected with the output end of the rectifying circuit;
the power supply transformation circuit comprises a transformer and an inductance coil, wherein the input side of the transformer is connected with the power supply output end side of the power control circuit, the output side of the transformer is connected with the power supply end of the ultrasonic transducer, and the inductance coil is connected in series between the output side of the transformer and the power supply end of the ultrasonic transducer;
series tuning matching is to connect a suitable inductor in series between the ultrasonic power supply and the piezoelectric transducer to improve the load impedance characteristics and power factor of the power supply. Under the ideal condition, when the series branch of the piezoelectric transducer is in series resonance, the ultrasonic power supply load is pure resistance after being tuned by the series matching inductor.
The impedance of the ultrasonic power supply is matched by adopting the transformer with reasonable transformation ratio, and the power supply circuit can realize full power output under different loads.
Under the condition that the power supply voltage is stable, the power obtained by the resistive load only depends on the resistance of the load, and when the power supply works normally, the equivalent impedance of the ultrasonic power supply load is pure resistive under the action of series tuning matching, the transformation of the primary and secondary side impedances is realized by adopting a transformer, and the impedance matching is carried out by designing the transformation ratio of the transformer.
The power control circuit comprises a controller, a sampling circuit and an inversion control circuit, wherein the power input end of the inversion control circuit is connected with the output end of the rectification circuit, the power output end of the inversion control circuit is connected with the input side of the transformer, the sampling end of the sampling circuit is connected with the power supply end of the ultrasonic transducer, the output end of the sampling circuit is connected with the output end of the controller, and the output end of the controller is connected with the control end of the inversion control circuit.
The rectification circuit is a single-phase bridge rectifier.
The inversion control circuit comprises an IGBT transistor I, an IGBT transistor II, an IGBT transistor III, an IGBT transistor IV, a diode I, a diode II, a diode III, a diode IV, a resonance capacitor I, a resonance capacitor II, a resonance capacitor III and a resonance capacitor IV,
a first diode and a first resonant capacitor are connected to the first IGBT transistor in parallel, the positive end of the first diode is connected with the output end of the first IGBT transistor, and the negative end of the first diode is connected with the input end of the first IGBT transistor;
a second diode and a second resonant capacitor are connected in parallel to the second IGBT transistor, the positive end of the second diode is connected with the output end of the second IGBT transistor, and the negative end of the second diode is connected with the input end of the second IGBT transistor;
a third diode and a third resonant capacitor are connected in parallel to the third IGBT transistor, the positive end of the third diode is connected with the output end of the third IGBT transistor, and the negative end of the third diode is connected with the input end of the third IGBT transistor;
a fourth diode and a fourth resonant capacitor are connected in parallel to the fourth IGBT transistor, the positive end of the fourth diode is connected with the output end of the fourth IGBT transistor, and the negative end of the fourth diode is connected with the input end of the fourth IGBT transistor;
the input ends of the IGBT transistor I and the IGBT transistor III are connected with the positive output end of the rectifying circuit, the output ends of the IGBT transistor II and the IGBT transistor IV are connected with the negative output end of the rectifying circuit, the output end of the IGBT transistor I is connected with the input end of the IGBT transistor II, and the output end of the IGBT transistor III is connected with the input end of the IGBT transistor IV;
the output end of the IGBT transistor I is connected with the negative electrode input end of the transformer, and the output end of the IGBT transistor III is connected with the positive electrode input end of the transformer.
As shown in fig. 2, during the phase shift control, the IGBT transistors T1 and T4 or T2 and T3 are no longer turned on and off simultaneously, but have a certain phase difference, i.e., a phase shift angle, when the operating frequency of the ultrasonic power supply is stable, the on time of the switching tube is fixed, and the output voltage of the inverter can be changed by adjusting the size of the phase shift angle, so that the amplitude of the output sine wave current is adjusted, and the output power is adjusted
The sampling circuit is a voltage and current sampler, and the sampling end of the voltage and current sampler is connected with the voltage input end of the ultrasonic transducer.
The controller comprises a phase discriminator, a voltage-controlled oscillator, a filter and a DSP controller, wherein the sampling signal output end of a sampling circuit and the signal output end of the voltage-controlled oscillator are respectively connected with the input end of the phase discriminator, the output end of the phase discriminator is connected with the input end of the filter, the output end of the filter is connected with the input end of the voltage-controlled oscillator, the input end of the DSP controller is respectively connected with the phase discriminator, the signal output ends of the voltage-controlled oscillator and the sampling circuit, and the output end of the DSP controller is respectively connected with the control ends of a first IGBT transistor, a second IGBT transistor, a third IGBT transistor and a fourth IGBT transistor.
The controller is characterized by further comprising a display control module, the display control module comprises a display screen and an input key, the signal output end of the DSP controller is connected with the input end of the display screen, and the input key is connected with the input end of the DSP controller.
The compensation capacitor is an electrolytic capacitor.
The DSP controller is a TMS320F2812 type DSP processor.
The shielding cover is further coated and designed outside the power circuit, electromagnetic shielding is performed through the shielding cover, the electromagnetic interference condition in the power supply is greatly reduced, the stability of the welding process is improved, and the conditions of random halt and dead halt in the midway of welding are greatly reduced.
A method for controlling a power circuit for effectively improving the welding effect of an ultrasonic mask comprises the following steps:
(1) an external commercial power is input into the single-phase bridge rectifier, and the output direct current is subjected to voltage stabilization through the compensation capacitor to realize a stable direct current output end;
(2) the method is characterized in that a full-bridge inversion topological structure is adopted, an IGBT (insulated gate bipolar transistor) is used as an inversion bridge arm, zero-voltage switching-on of a transistor device is realized by means of conduction of an anti-parallel diode on the transistor, and zero-voltage switching-off of the transistor device is realized through a charging process of a resonant capacitor;
(3) when the ultrasonic transducer is required to operate, the DSP controller outputs PWM control signals to 4 IGBT transistors for respective control;
(4) generating complementary PWM waves with dead zone control through a DSP controller, and outputting the complementary PWM waves to an IGBT transistor I, an IGBT transistor II, an IGBT transistor III and an IGBT transistor IV to realize that the IGBT transistor I and the IGBT transistor IV, and the IGBT transistor II and the IGBT transistor III are not simultaneously switched on and off;
(5) adjusting the output power according to actual needs to adjust the size of a phase shift angle of the PWM wave through the DSP controller when the working frequency of the ultrasonic power supply is stable, and adjusting and controlling the inverter control circuit to adjust the amplitude of the output sine wave current so as to adjust the output power;
sampling load voltage and load current, calculating active power through a DSP, analyzing power difference, calculating a phase shift angle required for realizing consistency with given power, and adjusting the phase shift angle through the change of a corresponding register value in DSP software to achieve the purpose of constant output power;
(6) in order to realize constant power output, a voltage and current sampler is used for acquiring voltage and current signals of an input power supply of the ultrasonic transducer, a phase discriminator is used for comparing the phases of the sampled voltage and current signals and output signals of a voltage-controlled oscillator to obtain error voltage with the phase difference of the sampled voltage and current signals, the error voltage is converted into average voltage through a filter, and the voltage-controlled oscillator continuously changes the frequency of the output signals according to the output average voltage to enable the frequency of the output signals to be gradually close to the frequency of the input signals, so that no phase error is finally achieved;
(7) the DSP controller receives and processes output signals of the phase discriminator, the voltage-controlled oscillator and the sampling power supply, judges the adjustment frequency by monitoring the change of a voltage and current phase difference feedback signal in real time, and realizes the tracking and control of the load resonant frequency by adjusting the frequency of the PWM wave.
The process of the DSP controller for frequency tracking of the load resonant frequency adopts a variable step length frequency tracking scheme of firstly greatly reducing the frequency and then reducing the step length to more accurately track the frequency,
by judging the size of the frequency drift range, under the condition that the phase difference between voltage and current is large, the step length of frequency tracking is changed by modifying the value of a timer period register TxPER in a DSP controller, phase tracking is firstly carried out by large step length, the phase difference value is quickly reduced, after the tracking is finished, the step length is reduced, the phase difference is judged once again and corrected until all step length gears are searched and judged, and the frequency tracking speed is accelerated under the condition of ensuring the frequency tracking precision.
The register value is set by adopting the DSP of the TMS320F2812 in a mode of generating a table value in a main program, the judgment of how to adjust the frequency is made by monitoring the change of a voltage and current phase difference feedback signal, and the tracking of the load resonant frequency is realized by adjusting the frequency of a PWM driving pulse.
The power factor correction circuit is adopted, so that harmonic current in the circuit is suppressed, and the integral power factor is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an effectively improve power supply circuit of ultrasonic wave gauze mask welding effect which characterized in that: comprises a rectifying circuit, a power control circuit, a power supply transformation circuit and an ultrasonic transducer,
the input end of the rectifying circuit is connected with an external commercial power, the output end of the rectifying circuit is connected with a compensation capacitor in parallel, the positive end of the compensation capacitor is connected with the positive output end of the rectifying circuit, and the negative end of the compensation capacitor is connected with the negative output end of the rectifying circuit;
the power supply input end of the power control circuit is connected with the output end of the rectifying circuit;
the power supply transformation circuit comprises a transformer and an inductance coil, wherein the input side of the transformer is connected with the power supply output end side of the power control circuit, the output side of the transformer is connected with the power supply end of the ultrasonic transducer, and the inductance coil is connected in series between the output side of the transformer and the power supply end of the ultrasonic transducer;
the power control circuit comprises a controller, a sampling circuit and an inversion control circuit, wherein the power input end of the inversion control circuit is connected with the output end of the rectification circuit, the power output end of the inversion control circuit is connected with the input side of the transformer, the sampling end of the sampling circuit is connected with the power supply end of the ultrasonic transducer, the output end of the sampling circuit is connected with the output end of the controller, and the output end of the controller is connected with the control end of the inversion control circuit.
2. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 1, wherein: the rectification circuit is a single-phase bridge rectifier.
3. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 1, wherein: the inversion control circuit comprises an IGBT transistor I, an IGBT transistor II, an IGBT transistor III, an IGBT transistor IV, a diode I, a diode II, a diode III, a diode IV, a resonance capacitor I, a resonance capacitor II, a resonance capacitor III and a resonance capacitor IV,
a first diode and a first resonant capacitor are connected to the first IGBT transistor in parallel, the positive end of the first diode is connected with the output end of the first IGBT transistor, and the negative end of the first diode is connected with the input end of the first IGBT transistor;
a second diode and a second resonant capacitor are connected in parallel to the second IGBT transistor, the positive end of the second diode is connected with the output end of the second IGBT transistor, and the negative end of the second diode is connected with the input end of the second IGBT transistor;
a third diode and a third resonant capacitor are connected in parallel to the third IGBT transistor, the positive end of the third diode is connected with the output end of the third IGBT transistor, and the negative end of the third diode is connected with the input end of the third IGBT transistor;
a fourth diode and a fourth resonant capacitor are connected in parallel to the fourth IGBT transistor, the positive end of the fourth diode is connected with the output end of the fourth IGBT transistor, and the negative end of the fourth diode is connected with the input end of the fourth IGBT transistor;
the input ends of the IGBT transistor I and the IGBT transistor III are connected with the positive output end of the rectifying circuit, the output ends of the IGBT transistor II and the IGBT transistor IV are connected with the negative output end of the rectifying circuit, the output end of the IGBT transistor I is connected with the input end of the IGBT transistor II, and the output end of the IGBT transistor III is connected with the input end of the IGBT transistor IV;
the output end of the IGBT transistor I is connected with the negative electrode input end of the transformer, and the output end of the IGBT transistor III is connected with the positive electrode input end of the transformer.
4. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 3, wherein: the sampling circuit is a voltage and current sampler, and the sampling end of the voltage and current sampler is connected with the voltage input end of the ultrasonic transducer.
5. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 3, wherein: the controller comprises a phase discriminator, a voltage-controlled oscillator, a filter and a DSP controller, wherein the sampling signal output end of a sampling circuit and the signal output end of the voltage-controlled oscillator are respectively connected with the input end of the phase discriminator, the output end of the phase discriminator is connected with the input end of the filter, the output end of the filter is connected with the input end of the voltage-controlled oscillator, the input end of the DSP controller is respectively connected with the phase discriminator, the signal output ends of the voltage-controlled oscillator and the sampling circuit, and the output end of the DSP controller is respectively connected with the control ends of a first IGBT transistor, a second IGBT transistor, a third IGBT transistor and a fourth IGBT transistor.
6. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 5, wherein: the controller is characterized by further comprising a display control module, the display control module comprises a display screen and an input key, the signal output end of the DSP controller is connected with the input end of the display screen, and the input key is connected with the input end of the DSP controller.
7. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 3, wherein: the compensation capacitor is an electrolytic capacitor.
8. The power circuit for effectively improving the welding effect of an ultrasonic mask according to claim 5, wherein: the DSP controller is a TMS320F2812 type DSP processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022554539.5U CN213817614U (en) | 2020-11-08 | 2020-11-08 | Power supply circuit capable of effectively improving welding effect of ultrasonic mask |
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| CN202022554539.5U CN213817614U (en) | 2020-11-08 | 2020-11-08 | Power supply circuit capable of effectively improving welding effect of ultrasonic mask |
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