CN108832838A - Constant-power drive power supply and driving method based on ARM and multiplier - Google Patents
Constant-power drive power supply and driving method based on ARM and multiplier Download PDFInfo
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- CN108832838A CN108832838A CN201810660932.7A CN201810660932A CN108832838A CN 108832838 A CN108832838 A CN 108832838A CN 201810660932 A CN201810660932 A CN 201810660932A CN 108832838 A CN108832838 A CN 108832838A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/06—Drive circuits; Control arrangements or methods
- H02N2/065—Large signal circuits, e.g. final stages
- H02N2/067—Large signal circuits, e.g. final stages generating drive pulses
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The present invention relates to ultrasonic power technology, for the constant-power power source for proposing a kind of High Power Factor, quick response, system complexity is reduced, detection accuracy is improved, for this purpose, the present invention is based on the Constant-power drive power supply and driving method of ARM and multiplier, structure is as follows：First part is driving circuit, including DDS chip, integrated PWM wave control chip and inversion amplifying circuit；Second part is sampling match circuit；Part III is signal conditioning circuit；Part IV is micro-control module, is made of ARM microprocessor, and by adjusting the PWM wave frequency, duty ratio realizes power limitation control.Present invention is mainly applied to ultrasonic powers to manufacture and design occasion.
Description
Technical field
The present invention relates to power technique fields, especially ultrasonic wave driving power technical field, are one kind based on ARM and multiply
The invariable power ultrasonic wave driving power of musical instruments used in a Buddhist or Taoist mass.
Background technique
Ultrasonic technique is widely used in machinery, aviation, electronics, material, doctor based on electronic technology, computer technology
The fields such as medicine are internationally recognized high-technology fields.Ultrasonic wave driving power, abbreviation ultrasonic-frequency power supply, by frequency 50Hz, voltage
The alternating current of 220V or 380V is converted into the alternating current of the hundreds of supreme kilovolts of frequency 20kHz or more, voltage, mentions to ultrasonic transducer
It is the core component of ultrasonic system for high-frequency energy, the performance of ultrasonic-frequency power supply directly determines the performance of ultrasonic system.And
The key technology of ultrasonic-frequency power supply is the frequency-tracking and power limitation control of energy converter.
The frequency-tracking of energy converter is always the emphasis and hot spot of ultrasonic-frequency power supply research, mostly uses the mode of locking phase greatly at present
It realizes.In contrast, the research and development of invariable power ultrasonic-frequency power supply system are less, and in fact, the power invariability of ultrasonic system has emphatically
The meaning wanted, especially in fields such as ultrasonic cleaning, ultrasonic extraction, Ultrasonic machinings.Firstly, power it is constant whether directly affect
The experience of user, stable ultrasonic instrument will bring user and preferably experience；Secondly, power it is constant whether directly affect ultrasound
The quality of processing, ultrasonic cleaning, stable output power can bring preferably processing and cleaning effect；Finally, power invariability control
System decides the safety of ultrasonic system, and the longevity of energy converter, amplitude transformer, plumb joint etc. will be greatly reduced in violent changed power
Life, instantaneous power is excessive or even can burn system, causes security risk.
The output power of ultrasonic system is affected by many factors, and causes the difficulty of power limitation control, these factors include：
1) variation loaded；2) variation of environment such as temperature, humidity etc.；3) state of energy converter, such as difference of different energy converters, transducing
Device aging, mounting means etc.；4) driving frequency selects different driving frequencies to have different power outputs, mostly adopts at present
Use the series resonance frequency (i.e. mechanical resonant frequency) of energy converter as driving frequency.In factors above, the variation and drive of load
Dynamic frequency is major influence factors.
For a long time, domestic and foreign scholars conduct extensive research in ultrasonic-frequency power supply field, substantially increase ultrasonic-frequency power supply
Performance, but still come with some shortcomings place, these deficiency mainly have：1) the accurate tracking of pursuit resonance frequency simply,
It causes at different conditions, the power difference after frequency-tracking is huge；2) due to the error of resonance matching circuit, frequency-tracking
Afterwards, the power factor of system is lower, is unsatisfactory for national relevant regulations, and increase the calorific value of driving circuit；3) existing permanent function
Rate controls ultrasonic-frequency power supply, and the mode of stepping is mostly used to adjust power, regulates the speed slow, is not suitable for load and changes violent field
It closes.
In order to solve above-mentioned deficiency, the present invention devises the Constant-power drive power supply of a kind of High Power Factor, quick response.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose the invariable power electricity of a kind of High Power Factor, quick response
Source：
(1) a kind of active power detection circuit based on multiplier is devised, is examined instead of traditional peak value or virtual value
Slowdown monitoring circuit can directly detect the active power of system, reduce system complexity, improve detection accuracy.
(2) a kind of voltage, current sample and phase detecting circuit and corresponding signal processing circuit are devised, and is added
Phase-correcting circuit carries out error compensation, ensure that the precision of phase-detection.
(3) a kind of power limitation control algorithm for being based on ARM (Advanced RISC Machines) microcontroller is devised,
The power factor and active power of real-time monitoring system make system fast and stable under the premise of maintaining system High Power Factor
Work near the rated power set.
For this purpose, the technical solution adopted by the present invention is that, the Constant-power drive power supply based on ARM and multiplier, structure is as follows：
First part is driving circuit, including DDS ((Direct Digital Synthesizer) chip, integrated PWM
(Pulse Width Modulation) wave controls chip and inversion amplifying circuit；ARM microprocessor exports two-way DA
(Digital to Analog Convert) signal controls the oscillator oscillation frequency and duty ratio of integrated PWM wave control chip,
ARM microprocessor controls the square wave of DDS chip output optional frequency to the synchronization end of integrated PWM wave control chip, and control exports
PWM wave frequency, driving PWM square wave is exported to inversion amplifying circuit, then is exported through transformer coupled to energy converter；
Second part be sampling match circuit, energy converter is matched using LC network, the inductance in LC network with change
Can device concatenation, capacitor in LC network and energy converter simultaneously connect, and to realize the tuning and impedance matching of energy converter, current sensor is adopted
Collection flows through the electric current of energy converter, and precision resistance is connected in parallel on the both ends collection voltages signal of transformer；
Part III is signal conditioning circuit, and voltage, current sampling signal first pass around signal amplification circuit and carry out signal
Amplification, filters out noise and harmonic component using switch-capacitor filtering circuit, carries out phasing using phase-shift circuit；Correction
Signal afterwards connects multiplier all the way, connects phase discriminator all the way, and voltage, current signal are multiplied to obtain by multiplier to be believed containing active power
The signal of breath, then low-pass filtered device obtain direct current signal, reach AD (the Analog to Digital of ARM microprocessor
Convert) port is detected, and voltage and current signal is converted the square-wave pulse containing phase angle information by phase discriminator, is reached
Microprocessor I/O (input/output) mouth carries out phase angle detection；Switch-capacitor filtering circuit is by switch capacitor filter
The identical two-way bandwidth-limited circuit of composition, centre frequency control DDS chip output frequency side by ARM microprocessor
The PWM wave frequency of wave real-time control, centre frequency and driving energy converter is completely the same, ensure that filtered signal gain one
It causes；
Part IV is micro-control module, is made of ARM microprocessor, and ARM microprocessor, which is removed, to be completed to chat in first part
Outside the integrated PWM wave control chip of the control stated, DDS chip, it is also used to control DDS chip output pulse square wave signal control switch
Capacitive filter centre frequency, to realize the tracking filter of sampled signal；By adjusting the PWM wave frequency, duty ratio is realized
Power limitation control.
Realize that specific step is as follows for power limitation control：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1,
Wherein F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△, △ are the phase error allowed, then at this time
Driving frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0, P0For watt level is arranged, then with frequency f at this timek, duty ratio c drive
Dynamic energy converter；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again,
Skip to step a).
Constant-power drive power supply drive method based on ARM and multiplier realizes have by means of aforementioned drive electric power unit
Body includes the following steps：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1,
Wherein F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△, △ are the phase error allowed, then at this time
Driving frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0, P0For watt level is arranged, then with frequency f at this timek, duty ratio c drive
Dynamic energy converter；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again,
Skip to step a).
Further, step d), e), f) is executed, power invariability is carried out, energy converter, output power are driven using PWM wave
It is directly proportional with the duty ratio c of PWM wave, it enablesThen adjust P to P0, directly track in single-step iteration to required function
The corresponding duty ratio of rate.
Further, if big change do not occur for load, environment etc., system will in step d), e), f) between recycle,
Stablize the active power of energy converter in P0Left and right, if big change occurs for load, the offset of energy converter occurrence frequency will then be jumped
It recycles out, reruns step a), carry out frequency-tracking again, carry out permanent rate control again later.
The features of the present invention and beneficial effect are：
(1) right using ARM microprocessor control DDS chip output frequency square wave to the synchronization end of PWM integrated control chip
Driving PWM wave frequency accurately controls, and effectively prevents the frequency drift of vibrating type frequency generator, realizes numerical frequency control
System, it is stable and reliable in work；
(2) ARM microprocessor control DDS chip output frequency square wave real-time control switch capacitor filter center frequency is utilized
Rate realizes the tracking filter of permanent bandwidth, when avoiding sampling signal frequency fluctuation, amplitude after different frequency signals filtering
Variation, improves the precision of power detection；
(3) active power of energy converter, i.e. real output are directly detected using multiplier, avoid voltage, electricity
Influence of the error to testing result when stream RMS to DC, improves detection accuracy, reduces system complexity.In addition, electric
The conditioning circuit of pressure, current signal, using identical amplification, filter circuit, and joined phase-shift circuit, carries out before runtime
Phasing improves precision of phase discrimination；
(4) system maintains higher power factor always, improves the utilization rate of energy and the EMC performance of system, together
Sample, higher power factor can reduce the calorific value of metal-oxide-semiconductor and transformer, extend lifetime of system；
(5) fast power is constant, and the present invention is using stable power output as control stress point, by closed-loop control, makes to surpass
Acoustic-electric source fast and stable is near predetermined power, and the phase and power information of constantly detection system, controls the perseverance of output power
It is fixed；
(6) adaptable, this system has wide applicability, lower to the required precision of matching network, exists
It can quick constant power output in the case where slight matching imbalance, load variation.
In conclusion compared with other ultrasonic-frequency power supplies, the present invention simple, fast response time, power invariability, height with structure
The advantages that power factor.
Detailed description of the invention：
Fig. 1 is that a kind of system of Constant-power drive power supply based on ARM and multiplier constitutes block diagram.
Fig. 2 is the flow chart of power limitation control algorithm.
Fig. 3 is permanent rate control algolithm operational effect figure.
In Fig. 1,1 is driving circuit, and 2 be sampling match circuit, and 3 be signal conditioning circuit, and 4 be micro treatment module, and 5 be inverse
Become amplifying circuit, 6 be integrated PWM generator circuit, and 7 be sampling precision resistance, and 8 be current sensor, and 9 change for piezoelectric-type ultrasonic
Energy device, 10 signal amplification circuits, 11 are switch capacitor filter, and 12 be phase-shift circuit, and 13 be zero-crossing comparator circuit, and 14 be to multiply
Adder circuit, 15 be phase discriminator, and 16 be low-pass filter circuit, and 17 be ARM microprocessor, and 18 be DDS chip.
Specific embodiment
The technical solution adopted by the present invention is that a kind of Constant-power drive power supply based on ARM and multiplier, including following four
Part：
First part is driving circuit, as shown in Figure 1, including DDS ((Direct Digital Synthesizer) chip
18, it integrates PWM (Pulse Width Modulation) wave control chip 6 (such as SG3525A) and inversion amplifying circuit 5 forms.
ARM microprocessor exports two-way DA (Digital to Analog Convert) signal and controls integrated PWM wave control chip oscillation
Device oscillation frequency and duty ratio, square wave to the integrated PWM wave that ARM microprocessor controls DDS chip output optional frequency control core
The synchronization end of piece, accurate control output PWM wave frequency, to realize the synchronization of driving PWM square wave frequency, accurate control.Driving
PWM square wave is exported to inversion amplifying circuit 5, and signal is zoomed into the power signal of energy converter needs.
Second part is sampling match circuit, as shown in Figure 1, being matched using LC network to energy converter, is changed with realizing
The tuning and impedance matching of energy device, are consistent the series resonance frequency of energy converter and the resonance frequency after matching, and reduce
System equivalent resistance.The electric current for flowing through energy converter is acquired using current sensor 8, is connected in parallel on transformer using precision resistance 7
Both ends collection voltages signal replaces the voltage at traditional acquisition energy converter both ends, keeps the fluctuation of sampled signal smaller.
Part III is signal conditioning circuit, as shown in Figure 1, voltage, current sampling signal first pass around signal amplification electricity
Road 10 carries out signal amplification, noise and harmonic component is filtered out using switch-capacitor filtering circuit 11, using phase-shift circuit 12
Carry out phasing；Signal after correction connects multiplier 14 all the way, connects phase discriminator 15 all the way, and multiplier believes voltage, electric current
Number multiplication obtains the signal containing active power information, then low-pass filtered device 16 obtains direct current signal, reaches ARM microprocessor
The port AD (Analog to Digital Convert) is detected, and phase discriminator converts voltage and current signal to containing phase
The square-wave pulse of angle information reaches microprocessor I/O (input/output) mouth and carries out phase angle detection.Switch-capacitor filtering electricity
The identical two-way bandwidth-limited circuit that road 11 is made of switch capacitor filter (such as LTC1068, LTC1064),
Centre frequency controls DDS chip output frequency square wave real-time control, the PWM wave frequency of centre frequency and driving energy converter by ARM
Rate is completely the same, ensure that filtered signal gain is consistent.
Part IV is micro-control module, as shown in Figure 1, being made of ARM microprocessor 17 and external circuit, microprocessor
Output two-way DA signal controls integrated PWM wave control chip oscillator oscillation frequency and duty ratio, microprocessor pass through SPI
Square wave to the integrated PWM wave of (Serial Peripheral Interface) Communication Control DDS chip output optional frequency controls
Chip synchronization end controls it and exports PWM wave frequency, to realize the synchronization of driving PWM square wave frequency, accurate control；Microprocessor
It controls DDS chip and exports pulse square wave signal control switch capacitive filter centre frequency, to realize the tracking filter of sampled signal
Wave；Microprocessor passes through SPI protocol and display screen, use using the active power information of internal A D interface detection multiplier output
The interaction of family key；Microprocessor is programmed, realizes automatic collection, the operation, processing of above-mentioned signal, and realizes a kind of permanent function
Rate control algolithm.
Specific implementation process is as follows：
The DA mouth of ARM microprocessor 17 exports DC voltage to PWM wave and controls integrated chip 6, makes its oscillator frequency
f1, while the synchronization end that the pulse square wave that 18 output frequency of DDS chip is f controls integrated chip 6 to PWM wave is controlled, keep its defeated
The PWM that frequency is f out drives square wave, and f is slightly larger than f1, take f=1.02f1。
Further, driving square wave is through semi-bridge inversion amplifying circuit 5, then is added to match circuit after transformer transformation and changes
17 both ends of energy device, driving energy converter 17 work.Sampling resistor 7 and current sensor 8 sample respectively obtains voltage, current signal,
Amplify through signal amplification circuit 10, reaches switch capacitor filter 11, the center of ARM microprocessor control switch capacitive filter
Frequency is consistent with signal frequency, after filtering out harmonic wave and noise.Filtered current signal passes through phase modulation circuit 12, starts in system
Before, it carries out phasing first with offset voltage, the phase-delay difference of current sample, obtains the voltage of single-frequencyElectric current
SignalIfPhase angle be 0, then.
Further, the voltage after phase modulation, current signal are divided into two-way, reach comparator 13 all the way, are converted into square wave, then
Phase discriminator 15 is reached, the pulse square wave comprising phase angle information is obtained, the I/O mouth for reaching ARM microprocessor carries out pulse and catches
It obtains, calculates voltage, current phase angle θ；Another way reaches multiplier 14, by voltageAnd current signalIt is multiplied, if：
U, I is respectively voltage, current amplitude, and w is signal frequency, then multiplier exports result U0For：
E is fixed value, the constant determined by multiplier chip in formula.It can be seen that U0In include high fdrequency component, through low pass
After filtering, DC voltage U is obtained1For：
It can be seen that 2EU1For total active power of output end, and matching inductance, matching capacitance, transducer static capacitor
It only include reactive power component, therefore, 2EU1The as active power of energy converter.U1It samples to obtain through AD by ARM microprocessor,
To which real-time monitoring goes out the size of active-power P.
Correspondingly, a kind of Constant-power drive power supply based on ARM and multiplier, the flow chart of power limitation control algorithm is such as
Shown in Fig. 2, specific step is as follows：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1,
Wherein F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△ (△ is the phase error allowed), then at this time
Driving frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0(P0For watt level is arranged), then with frequency f at this timek, duty ratio c drive
Dynamic energy converter；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again,
Skip to step a).
System is executed according to above-mentioned steps, through step a), b), c), carries out the frequency-tracking based on dichotomy, make voltage,
The phase angle θ of electric current controls near 0 °, thus to approach the frequency of energy converter series resonance frequency driving energy converter, and obtain
Higher power factor, the power factor in energy converter circuit are cos θ, when setting △ as 8 °, the power factor in energy converter circuit
0.99 or more；When setting △ as 15 °, the power factor in energy converter circuit is 0.966 or more；When setting △ as 20 ° of energy converters
The power factor in circuit is 0.94 or more；When setting △ as 25 °, the power factor in energy converter circuit is 0.906 or more.
Further, step d), e), f) is executed, power invariability is carried out, energy converter, output power are driven using PWM wave
It is directly proportional with the duty ratio c of PWM wave, it enablesThen P can be directly set to adjust to P0Left and right, is directly tracked in single-step iteration
To the corresponding duty ratio of required power.
Further, if big change do not occur for load, environment etc., system will in step d), e), f) between recycle,
Stablize the active power of energy converter in P0Left and right, if big change occurs for load, the offset of energy converter occurrence frequency will then be jumped
It recycles out, reruns step a), carry out frequency-tracking again, carry out permanent rate control again later.It, can be with by the above process
So that ultrasonic transducer is had constant power output in the case where loading variation, and keeps the higher power factor of system.
The present invention is described in detail with reference to the accompanying drawings and detailed description.
In Fig. 1, driving circuit 1 is made of PWM wave control integrated chip 6, semi-bridge inversion amplifying circuit 5, ARM micro process
The DA mouth of device 17 exports DC voltage to PWM wave and controls integrated chip 6, makes its oscillator frequency f1, while controlling DDS chip
18 output frequencies are that the pulse square wave of f controls the synchronization end of integrated chip 6 to PWM wave, drive the PWM of its output frequency f
Square wave, f are slightly larger than f1, take f=1.02f1.It drives square wave through semi-bridge inversion amplifying circuit 5, then is added to after transformer transformation
With 17 both ends of circuit and energy converter, energy converter 17 is driven to work.Sampling resistor 7 and current sensor 8 sample respectively obtain voltage,
Current signal amplifies through signal amplification circuit 10, reaches switch capacitor filter 11, the filter of ARM microprocessor control switch capacitor
The centre frequency of wave device is consistent with signal frequency, after filtering out harmonic wave and noise.Filtered current signal passes through phase modulation circuit 12,
Before system starting, carries out phasing first with offset voltage, the phase-delay difference of current sample, obtaining single-frequency just
String voltage signalCurrent signalIfPhase angle be 0.
Further, the voltage after phase modulation, current signal are divided into two-way, reach comparator 13 all the way, are converted into square wave, then
Phase discriminator 15 is reached, the pulse square wave comprising phase angle information is obtained, the I/O mouth for reaching ARM microprocessor carries out pulse and catches
It obtains, calculates voltage, current phase angle θ；Another way reaches multiplier 14, by voltageAnd current signalIt is multiplied, if：
U, I is respectively voltage and current amplitude, and w is signal frequency, then multiplier exports result U0For：
E is fixed voltage, the constant determined by multiplier chip in formula.It can be seen that U0In include high fdrequency component, through low
After pass filter, DC voltage U is obtained1For：
It can be seen that 2EU1For total active power of output end, and matching inductance, matching capacitance, transducer static capacitor
It only include reactive power component, therefore, 2EU1The as active power of energy converter.U1It samples to obtain through AD by ARM microprocessor,
To which real-time monitoring goes out the size of active-power P.
Correspondingly, a kind of Constant-power drive power supply based on ARM and multiplier, the flow chart of power limitation control algorithm is such as
Shown in Fig. 2, specific step is as follows：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1,
Wherein F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△ (△ is the phase error allowed), then at this time
Driving frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0(P0For watt level is arranged), then with frequency f at this timek, duty ratio c drive
Dynamic energy converter；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again,
Skip to step a).
System is executed according to above-mentioned steps, through step a), b), c), carries out the frequency-tracking based on dichotomy, make voltage,
The phase angle θ of electric current controls near 0 °, thus to approach the frequency of energy converter series resonance frequency driving energy converter, and obtain
Higher power factor, the power factor in energy converter circuit are cos θ, when setting △ as 8 °, the power factor in energy converter circuit
0.99 or more；When setting △ as 15 °, the power factor in energy converter circuit is 0.966 or more；When setting △ as 20 ° of energy converters
The power factor in circuit is 0.94 or more；When setting △ as 25 °, the power factor in energy converter circuit is 0.906 or more.
Further, step d), e), f) is executed, power invariability is carried out, energy converter, output power are driven using PWM wave
It is directly proportional with the duty ratio c of PWM wave, it enablesThen P can be directly set to adjust to P0Left and right, is directly tracked in single-step iteration
To the corresponding duty ratio of required power.
Further, if big change do not occur for load, environment etc., system will in step d), e), f) between recycle,
Stablize the active power of energy converter in P0Left and right, if big change occurs for load, the offset of energy converter occurrence frequency will then be jumped
It recycles out, reruns step a), carry out frequency-tracking again, carry out permanent rate control again later.It, can be with by the above process
So that ultrasonic transducer is had constant power output in the case where loading variation, and keeps the higher power factor of system.
In confirmatory experiment, used ultrasonic transducer, series resonance frequency is 37486hz, load resistance after band carries
210.3 Ω are equivalent to, energy converter Q value is about 50, driving voltage 200V, is brought into operation with wider initial swept frequency range above-mentioned
F is arranged in algorithm1=35000hz, F2=45000hz, C1=0.2, △=4 °, P0=50W, operation result is as shown in figure 3, in k
When=10, i.e., when the 10th time adjustment, phase angle meet demand, power factor 0.998 then carries out power invariability, in k=11
When, power stability is in 50w or so, c=0.702 at this time.As it can be seen that this system can be quickly real in wider frequency range
The constant power output of existing ultrasonic transducer, and keep the higher power factor of system.
Claims (3)
1. a kind of Constant-power drive power supply based on ARM and multiplier, characterized in that structure is as follows：
First part is driving circuit, including DDS (Direct Digital Synthesizer) chip, integrated PWM (Pulse
Width Modulation) wave control chip and inversion amplifying circuit；ARM microprocessor exports two-way DA (Digital to
Analog Convert) signal controls the oscillator oscillation frequency and duty ratio of integrated PWM wave control chip, ARM microprocessor
The square wave of DDS chip output optional frequency is controlled to the synchronization end of integrated PWM wave control chip, control output PWM wave frequency is driven
Dynamic PWM square wave is exported to inversion amplifying circuit, then is exported through transformer coupled to energy converter；
Second part is sampling match circuit, is matched using LC network to energy converter, inductance and energy converter in LC network
Concatenation, capacitor and energy converter in LC network simultaneously connect, to realize that the tuning and impedance matching of energy converter, current sensor acquisition are flowed
The electric current of energy converter is crossed, precision resistance is connected in parallel on the both ends collection voltages signal of transformer；
Part III is signal conditioning circuit, and voltage, current sampling signal first pass around signal amplification circuit and carry out signal amplification,
Noise and harmonic component are filtered out using switch-capacitor filtering circuit, carries out phasing using phase-shift circuit；After correction
Signal connects multiplier all the way, connects phase discriminator all the way, and voltage, current signal are multiplied to obtain containing active power information by multiplier
Signal, then low-pass filtered device obtain direct current signal, reach AD (the Analog to Digital of ARM microprocessor
Convert) port is detected, and voltage and current signal is converted the square-wave pulse containing phase angle information by phase discriminator, is reached
Microprocessor I/O (input/output) mouth carries out phase angle detection；Switch-capacitor filtering circuit is by switch capacitor filter
The identical two-way bandwidth-limited circuit of composition, centre frequency control DDS chip output frequency side by ARM microprocessor
The PWM wave frequency of wave real-time control, centre frequency and driving energy converter is completely the same, ensure that filtered signal gain one
It causes；
Part IV is micro-control module, be made of ARM microprocessor, and ARM microprocessor is except completing to describe in first part
Outside the integrated PWM wave control chip of control, DDS chip, it is also used to control DDS chip output pulse square wave signal control switch capacitor
Filter centre frequency, to realize the tracking filter of sampled signal；By adjusting the PWM wave frequency, the permanent function of duty ratio realization
Rate control.
2. the Constant-power drive power supply based on ARM and multiplier as described in claim 1, characterized in that realize invariable power control
Specific step is as follows for system：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1, wherein
F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△, △ are the phase error allowed, then with drive at this time
Dynamic frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0, P0For watt level is arranged, then with frequency f at this timek, duty ratio c driving transducing
Device；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again, skips to
Step a).
3. a kind of Constant-power drive power supply drive method based on ARM and multiplier, characterized in that by means of aforementioned driving power
Device is realized, following steps are specifically included：
A) initial swept frequency range is set as (fd,fu), enable fu=F1, fd=F2, driving duty ratio is set as c, enables c=C1, wherein
F1、F2、C1For the constant of setting, enabling k=1, k is the number of frequency sweep iteration；
B) driving circuit is controlled, with frequencyDuty ratio c drives energy converter；
C) it samples, the phase angle θ of detection voltage, electric current, if-△<θ<△, △ are the phase error allowed, then with drive at this time
Dynamic frequency fkFor working frequency；
If θ>△ then enables fu=fk, k=k+1 skips to step b)；
Otherwise, f is enabledd=fk, k=k+1 skips to step b)；
D) with frequency fk, duty ratio c driving energy converter, the active-power P of detection system；
E) P is differentiated, if 0.99P0<P<1.05P0, P0For watt level is arranged, then with frequency f at this timek, duty ratio c driving transducing
Device；
Otherwise, it enablesSkip to step d)；
F) voltage, current phase angle θ are detected, if-△<θ<△, skips to step d), and circulation executes；Otherwise, frequency sweep again, skips to
Step a).
Further, execute step d), e), f), carry out power invariability, energy converter is driven using PWM wave, output power and
The duty ratio c of PWM wave is directly proportional, enablesThen adjust P to P0, directly track in single-step iteration to required power
Corresponding duty ratio.
Further, if big change do not occur for load, environment etc., system will in step d), e), f) between recycle, make to change
The active power of energy device is stablized in P0Left and right, if big change occurs for load, the offset of energy converter occurrence frequency then will jump out and follow
Ring reruns step a), carries out frequency-tracking again, carries out permanent rate control again later.
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