CN107727931A - Ultrasonic-frequency power supply phase difference detection device and method based on combined controller - Google Patents
Ultrasonic-frequency power supply phase difference detection device and method based on combined controller Download PDFInfo
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- CN107727931A CN107727931A CN201710872505.0A CN201710872505A CN107727931A CN 107727931 A CN107727931 A CN 107727931A CN 201710872505 A CN201710872505 A CN 201710872505A CN 107727931 A CN107727931 A CN 107727931A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
Abstract
The invention discloses a kind of ultrasonic-frequency power supply phase difference detection device based on combined controller, the output end of current sensor is grounded by sampling resistor R3, the output end of the first input end connection current sensor of phase detecting circuit, an input of the first output end connection fpga chip of phase detecting circuit；The output end of the second input connection voltage sensor circuit of phase detecting circuit, another input of the second output end connection fpga chip of phase detecting circuit；The output end of current sensor and the output end of voltage sensor are also connected with two inputs of dsp chip, and fpga chip and dsp chip are connected with each other.The invention also discloses the ultrasonic-frequency power supply phase difference detection method based on combined controller.Voltage-phase feedback signal is filtered using FPGA, avoids and is made a mistake using the circuit of gate extraction phase difference, effectively measured phase signal, accurate foundation is provided for compensation phase difference.
Description
Technical field
The invention belongs to the accurate detection technique field of the phase difference of the electric current of power ultrasonic transducer and voltage, and in particular to
A kind of ultrasonic-frequency power supply phase difference detection device and method based on DSP and FPGA.
Background technology
Ultrasonic-frequency power supply has a wide range of applications in modern industry, mainly includes cleaning, spraying, food processing, welding, machinery
Processing etc..Ultrasonic-frequency power supply provides supersonic frequency AC signal to ultrasonic transducer, and transducer converts electric energy to acoustic energy i.e. machinery and shaken
Dynamic, the conversion efficiency for improving ultrasound-driven is the key problem of ultrasound-driven technology, and accurately gathers transducer phase signal, is
The premise of the regulation of power supply invariable power and automatic frequency tracking is realized, and ensures the key of ultrasonic power system steady operation,
Therefore the accurate measurement of transducer phase signal is particularly important.Simultaneously, it is necessary to logical in the ultrasonic-frequency power supply course of work
Phase-detection control frequency is crossed to keep the voltage and current phase of transducer identical.Both at home and abroad at present for high frequency ultrasound power supply
The technology that follows mainly have two kinds, one kind is that another kind is to use Digital Control using simulation control.
The phase difference detection of circuit is realized, it is necessary to design the control of large amount of complex using the high frequency ultrasound power supply of simulation control
Circuit processed, and have that circuit element is easy to aging, temperature drift is serious, parameter adjustment is inconvenient, and in dynamic response and control accuracy
Etc. it is not ideal enough, the problems such as power attenuation big, poor universality and control are dumb be present；And due to voltage and current phase
The hysteresis of detection circuit is inconsistent, and result in the frequency following of current digital high frequency ultrasound power supply very can not accurately examine
Measure and.
The content of the invention：
The defects of in order to overcome above-mentioned background technology, the invention provides the ultrasonic-frequency power supply phase difference based on combined controller
Detection means and method, this method being capable of effectively measuring phase differences.
In order to solve the above-mentioned technical problem used technical scheme of the invention is：
Including current sensor circuit and voltage sensor circuit, current sensor circuit includes current sensor, electric current
The output end of sensor is grounded by sampling resistor R3, and voltage sensor circuit includes voltage sensor and differential amplifier circuit；
Also include phase detecting circuit, the output end of the first input end connection current sensor of phase detecting circuit, phase-detection electricity
One input of the first output end connection fpga chip on road；The second input connection voltage sensor of phase detecting circuit
The output end of circuit, another input of the second output end connection fpga chip of phase detecting circuit；Current sensor
Output end and the output end of voltage sensor are also connected with two inputs of dsp chip, and fpga chip mutually interconnects with dsp chip
Connect.
It is preferred that the input of current sensor is used to connect current amplifier, the input of voltage sensor is used to connect
Connect controlled voltage source or signal generator.
It is preferred that phase detecting circuit is included in the first impedance being sequentially arranged between first input end and the first output end
Isolation circuit, the first biasing circuit, first voltage comparator circuit and the first level shifting circuit；
It is preferred that be additionally included in be sequentially arranged between the second input and the second output end the second impedance isolation circuit,
Second biasing circuit, second voltage comparator circuit and second electrical level change-over circuit.
The present invention also provides a kind of ultrasonic-frequency power supply phase difference detection method based on combined controller, including：
Step 1, the input of the input of current sensor and voltage sensor is connected in parallel on controlled voltage source or signal
The output end of generator, make the sweep voltage signal and current signal input current sensor and voltage sensor of tentering value,
Obtain the phase-frequency characteristic curve of input voltage signal and output voltage signal, and input voltage and phase detecting circuit output electricity
Press the phase difference of phase signalWherein kUFor the proportionality coefficient of frequency and delayed phase relation,
bUFor the constant term in relational expression；And the phase difference of input current signal and output current phase signalWherein kIFor the proportionality coefficient of frequency and delayed phase relation, bIFor the constant term in relational expression.
Step 2, circuit is detected in voltage-phase respectively by controlled voltage source and current source and inputs different amplitudes respectively
The phase determined frequency sinusoidal voltage signal and current signal, detect input voltage signal and output voltage phase signal respectively
Hysteresis, and the delayed phase of detection input current signal and output current phase signal；Signal generator is first passed through in voltage
The input of sensor inputs the sine voltage signal of different amplitudes, voltage magnitude corresponding to record and voltage-phase is stagnant obtains the
One group of dataPass through current amplifier
Sinusoidal current signal, current amplitude corresponding to record and current phase hysteresis are inputted in the input of current sensor, obtains the
Two groups of data
Wherein U0To UmFor the amplitude of input voltage signal,ExtremelyFor voltage-phase
Detect the hysteresis of electric current, I0To ImFor the amplitude of input current signal,ExtremelyFor electric current phase
The lagged value of position detection circuit, m are the data arrived of the m times measurement；
Described point is carried out to first group of data and second group of data, and is fitted, respectively obtain voltage-phase feedback branch and
The delayed phase of current phase feedback branch and the expression formula of input signal amplitude are as follows：
Wherein U is the amplitude of voltage signal, and I is the amplitude of current signal, and n is arbitrary positive integer, kUnFor voltage-phase
The coefficient of n item, k are corresponded in hysteresis expression formulaInThe coefficient that n item is corresponded in expression formula, b are lagged for current phaseUC, bICPoint
Not Wei voltage and current delayed phase expression formula constant term, obtain transducer work in phase lag error expression formula
Step 3, DSP distinguishes the output end of sampled voltage sensor and current sensor by AD, obtain voltage U and
Electric current I amplitude, substitute into phase lag error in transducer workExpression formula obtain the phase difference to be compensated
Value, detect actual phase differenceThen real voltage current and phase difference
It is preferred that the step of also including compensating testing result, specifically include：
The acquired results real voltage current and phase difference of judgment step 3Whether 0 is equal to, if so, then keeping PWM frequency
Output, if it is not,
Then determine whether real voltage current and phase differenceWhether the effective range of phase-difference control is exceeded, if so,
Then frequency sweep locking frequency again, if it is not, then carrying out the output frequency that PID arithmetic accurately adjusts PWM.
The beneficial effects of the present invention are：Voltage-phase feedback signal is filtered using FPGA, avoids use
The circuit of gate extraction phase difference makes a mistake, and has accurately measured phase steric retardation present in electric current and voltage-phase detection circuit
It is inconsistent afterwards, and phase signal can be converted into digital quantity in real time and DSP is sent to by expansion bus outside XINTF, carry
The speed of high DSP processing phase signal, simplifies controller, has effectively measured phase signal, is carried for compensation phase difference
Accurate foundation is supplied.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention one；
Fig. 2 is the flow chart of high frequency ultrasound power supply；
Fig. 3 is ultrasonic-frequency power supply overall structure figure.
In figure：1- current sensors, 2- voltage sensors, 3-FPGA, 4-DSP, 5- the first impedance isolation circuits, 6- first
Biasing circuit, 7- first voltage comparator circuits, the level shifting circuits of 8- first, 9- the second impedance isolation circuits, 10- second are inclined
Circuits, 11- second voltage comparator circuits, 12- second electrical level change-over circuits, 13- transducers, 14- matching inductances, 15- is certainly
Lift drive circuit, 16- full bridge inverters, 17- high frequency transformers.
Embodiment
The present invention is described further with reference to the accompanying drawings and examples.
Embodiment one
Include the circuit of current sensor 1 and the circuit of voltage sensor 2 as shown in Figure 1, the circuit of current sensor 1 includes electric current
Sensor 1, the output end of current sensor 1 are grounded by sampling resistor R3, and the circuit of voltage sensor 2 includes voltage sensor 2
And differential amplifier circuit；Also include phase detecting circuit, the first input end of phase detecting circuit connects the defeated of current sensor 1
Go out end, an input of the first output end connection FPGA3 chips of phase detecting circuit；Second input of phase detecting circuit
The output end of the end connection circuit of voltage sensor 2, another of the second output end connection FPGA3 chips of phase detecting circuit are defeated
Enter end；The output end of current sensor 1 and the output end of voltage sensor 2 are also connected with two inputs of DSP4 chips, FPGA3
Chip and DSP4 chips are connected with each other.
The input of current sensor 1 is used to connect current amplifier, and the input of voltage sensor 2 is controlled for connecting
Voltage source or signal generator.
Phase detecting circuit is included in the first impedance isolation electricity being sequentially arranged between first input end and the first output end
Road 5, the first biasing circuit 6, the level shifting circuit 8 of first voltage comparator circuit 7 and first；
It is inclined to be additionally included in the second impedance isolation circuit 9, second being sequentially arranged between the second input and the second output end
Circuits 10, second voltage comparator circuit 11 and second electrical level change-over circuit 12.
The input voltage signal of transducer 13 is then by linear optical coupling voltage sensor 2, also passes through resistance second afterwards
FPGA3 is output to after anti-isolation circuit, the second biasing circuit 10, second voltage comparator, second electrical level change-over circuit 12.Finally
Phase signal is converted to digital quantity by FPGA3, is sent to by bus in DSP4.
Wherein, the first impedance isolation circuit 5, the second impedance isolation circuit 9, the first biasing circuit 6 and the second biasing circuit
10 are realized using the amplifier chip of both end power supplying, and the model LM318 of the amplifier chip of both end power supplying is used in the present embodiment；
In first biasing circuit 6 and the second biasing circuit 10, by taking the biasing circuit of current signal as an example, by regulation resistance R1, R2 or
R4, R5 resistance, thus it is possible to vary bias voltage, and biasing ratio.In practice, R1=R2, R4=R5 are typically taken.First voltage
Comparison circuit and second voltage comparison circuit realize that voltage comparator chip is adopted in the present embodiment using voltage comparator chip
With model TLV3202；First level shifting circuit 8 and second electrical level change-over circuit 12 realized using triple gate chip, this reality
Apply the model SN74LVC1G125 of example use.(actual chips type selecting selects corresponding device according to the working frequency of design).
Different amplitudes will be inputted respectively in the input of voltage sensor 2 and current sensor 1 by ac current source and voltage source
Electric current and voltage signal, using as described in embodiment two specific steps demarcate phase detecting circuit, obtain measure loop amplitude with
The functional relation of delayed phase, and then obtain corresponding penalty function relational expression.Using the AD conversion module in DSP4 to electricity
Pressure and the amplitude of electric current are detected, and amplitude and the penalty function relational expression of delayed phase are carried out into specific software algorithm volume
Journey, calculate caused voltage signal and current signal phase steric retardation when flowing through phase detecting circuit respectively by electric current and voltage magnitude
Afterwards, and then the two phase difference is obtained, DSP4 is communicated by external bus with FPGA3.
As shown in figure 3, on the whole circuit of ultrasonic-frequency power supply after electricity, pwm signal caused by DSP4 by FPGA3 phase shifts,
Bootstrapping drive circuit 15 is connected to, driving full bridge inverter 16 works, and is high-frequency ac square wave by smooth DC inverter
Electric current；High-frequency ac square wave is isolated by high frequency transformer 17, the Vin being output in figure, is become by the resonance of matching network
Change, output high frequency sinusoidal alternating current acts on transducer 13, and transducer 13 converts electrical energy into ultrasonic mechanical vibration output.Together
When, gather the voltage signal Vin and current signal of transducer 13 respectively by voltage detecting circuit and current detection circuit, and
DSP4 determines phase difference compensation amount, by the communication with FPGA3, in FPGA3 by detecting the amplitude of voltage and current signal
Middle detection quantifies and compensates both phase differences and transmit data to DSP4.
Embodiment two
A kind of ultrasonic-frequency power supply phase difference detection method based on combined controller, including：
Step 1, the input of the input of current sensor 1 and voltage sensor 2 is connected in parallel on controlled voltage source or letter
The output end of number generator, make the sweep voltage signal and current signal input current sensor 1 and voltage sensor of tentering value
Device 2, obtains the phase-frequency characteristic curve of input voltage signal and output voltage signal, and input voltage and phase detecting circuit it is defeated
Go out the phase difference of voltage phase signalWherein kUFor frequency and the ratio of delayed phase relation
Coefficient, bUFor the constant term in relational expression；And the phase difference of input current signal and output current phase signalWherein kIFor the proportionality coefficient of frequency and delayed phase relation, bIFor the constant term in relational expression.
Step 2, circuit is detected in voltage-phase respectively by controlled voltage source and current source and inputs different amplitudes respectively
The phase determined frequency sinusoidal voltage signal and current signal, detect input voltage signal and output voltage phase signal respectively
Hysteresis, and the delayed phase of detection input current signal and output current phase signal；Signal generator is first passed through in voltage
The input of sensor 2 inputs the sine voltage signal of different amplitudes, voltage magnitude corresponding to record and voltage-phase is stagnant obtains
First group of dataPass through Current amplifier
Device inputs sinusoidal current signal, current amplitude corresponding to record and current phase hysteresis in the input of current sensor 1, obtains
Second group of data
Wherein U0To UmFor the amplitude of input voltage signal,ExtremelyFor voltage-phase
Detect the hysteresis of electric current, I0To ImFor the amplitude of input current signal,ExtremelyFor electric current phase
The lagged value of position detection circuit, m are the data arrived of the m times measurement；
Described point is carried out to first group of data and second group of data, and is fitted, respectively obtain voltage-phase feedback branch and
The delayed phase of current phase feedback branch and the expression formula of input signal amplitude are as follows：
Wherein U is the amplitude of voltage signal, and I is the amplitude of current signal, and n is arbitrary positive integer, kUnFor voltage-phase
The coefficient of n item, k are corresponded in hysteresis expression formulamThe coefficient that n item is corresponded in expression formula, b are lagged for current phaseUC, bICRespectively
For the constant term of voltage and current delayed phase expression formula, the expression formula of phase lag error during transducer 13 works is obtained
Step 3, DSP4 distinguishes the output end of sampled voltage sensor 2 and current sensor 1 by AD, obtains voltage U
And electric current I amplitude, substitute into phase lag error during transducer 13 worksExpression formula obtain the phase to be compensated
The value of potential difference, detect actual phase differenceThen real voltage current and phase difference
The penalty function is programmed in DSP4 controllers, and controls FPGA3, it is possible to achieve the accurate measurement of phase difference,
The final accurate control for realizing ultrasonic-frequency power supply.
The step of the present embodiment also includes compensating testing result, specifically include：
The acquired results real voltage current and phase difference of judgment step 3Whether 0 is equal to, if so, then keeping PWM frequencies
Rate exports, if it is not,
Then determine whether real voltage current and phase differenceWhether the effective range of phase-difference control is exceeded, if
It is, then frequency sweep locking frequency again, if it is not, then carrying out the output frequency that PID arithmetic accurately adjusts PWM.
As shown in Fig. 2 the whole control process of the ultrasonic-frequency power supply of the present embodiment is realized in DSP4, specifically include：First
DSP4, by the hardware circuit shown in Fig. 3, drives full bridge inverter 16, excited in Fig. 3 by exporting frequency sweep pwm signal
Matching inductance 14 and transducer 13.Meanwhile the current value of transducer 13 is detected, determine the Frequency point note where current maxima
Make f max, and set the Frequency point as working frequency.Then the input voltage of transducer 13 and the phase difference of output current are gatheredAnd phase-voltage x current amplitude error detection the penalty function for introducing the detection circuit based on Fig. 1 is entered by DSP4
Row AD is detected, the voltage magnitude U at detection transducer 13 both ends, and flows through the current amplitude I of transducer 13, substitutes into obtained benefit
Repay in function, obtain more accurately phase differenceRealize accurate detection phase difference.Using phase difference as input, when phase difference not
During Deng 0, if beyond the effective range of phase-difference control, frequency sweep locking frequency again；If without departing from effective range, carry out
PID arithmetic (proportional-integral-differential computing) accurately adjusts PWM output frequency.When phase difference is 0, keep PWM frequency defeated
Go out.Realize the accurate control of the resonant frequency of transducer 13.Step 1 in the present embodiment as obtains phase difference in Fig. 2 to step 3
With the specific method of the penalty function relational expression of voltage x current amplitude.
The present invention in the whole ultrasonic power circuit course of work, believe by the voltage that transducer 13 is obtained by bleeder circuit
Number, the voltage signal is after the processing of linear optical coupling voltage sensing circuit, then isolates successively by impedance respectively, biases, zero passage
FPGA3 is output to after comparison, level conversion；The current signal of transducer 13 is gathered using current sensor 1, and passes through sampling resistor
Voltage signal is converted into, FPGA3 is output to after also passing through impedance isolation, biasing, Zero-cross comparator, level conversion afterwards.
Due to the difference Jing Guo above-mentioned links response speed, can cause electric current and voltage delayed phase it is inconsistent, pass through mark
Determine measure loop characteristic, obtain existing linear relationship between electric current and the amplitude of voltage and its delayed phase, in DSP4 and
Effective algorithm calculation process has been carried out in FPGA3, the amplitude size of voltage and current is detected by DSP4 A/D module
Its delayed phase amount is obtained, hysteresis is compensated in FPGA3, accurately and effectively have detected the phase of electric current and voltage
Difference.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (5)
1. the ultrasonic-frequency power supply phase difference detection device based on combined controller, it is characterised in that：Including current sensor circuit and
Voltage sensor circuit, current sensor circuit include current sensor (1), and the output end of the current sensor (1) passes through
Sampling resistor R3 is grounded, and voltage sensor circuit includes voltage sensor (2) and differential amplifier circuit；Also include phase-detection electricity
Road, the first input end of the phase detecting circuit connect the output end of the current sensor (1), the phase detecting circuit
The first output end connection FPGA (3) chip an input；Described in the second input connection of the phase detecting circuit
The output end of voltage sensor circuit, the second output end of the phase detecting circuit connect the another of FPGA (3) chip
Individual input；The output end of the current sensor (1) and the output end of the voltage sensor (2) are also connected with DSP (4) chip
Two inputs, FPGA (3) chips and the DSP (4) chip are connected with each other.
2. the ultrasonic-frequency power supply phase difference detection device according to claim 1 based on combined controller, it is characterised in that：Institute
The input for stating current sensor (1) is used to connect current amplifier, the input of the voltage sensor (2) be used to connecting by
Control voltage source or signal generator.
3. the ultrasonic-frequency power supply phase difference detection device according to claim 1 based on combined controller, it is characterised in that：
The phase detecting circuit is included in the first resistance being sequentially arranged between the first input end and first output end
Anti- isolation circuit (5), the first biasing circuit (6), first voltage comparator circuit (7) and the first level shifting circuit (8)；
Be additionally included in be sequentially arranged between second input and second output end the second impedance isolation circuit (9),
Second biasing circuit (10), second voltage comparator circuit (11) and second electrical level change-over circuit (12).
A kind of 4. ultrasonic-frequency power supply phase difference detection method based on combined controller, it is characterised in that including：
Step 1, the input of the input of the current sensor (1) and the voltage sensor (2) is connected in parallel on controlled electricity
The output end of potential source or signal generator, the sweep voltage signal and current signal for making tentering value input the current sensor
(1) the phase-frequency characteristic curve of input voltage signal and output voltage signal, and input and the voltage sensor (2), are obtained
The phase difference of voltage and phase detecting circuit output voltage phase signalWherein kUFor frequency
With the proportionality coefficient of delayed phase relation, bUFor the constant term in relational expression；And input current signal and output current phase
The phase difference of signal
Wherein kIFor the proportionality coefficient of frequency and delayed phase relation, bIFor the constant term in relational expression.
Step 2, circuit is detected in voltage-phase respectively by controlled voltage source and current source and inputs determining for different amplitudes respectively
Frequency sinusoidal voltage signal and current signal, the phase steric retardation of input voltage signal and output voltage phase signal is detected respectively
Afterwards, and detection input current signal and output current phase signal delayed phase；Signal generator is first passed through to pass in voltage
The input of sensor (2) inputs the sine voltage signal of different amplitudes, voltage magnitude corresponding to record and voltage-phase is stagnant obtains
First group of data
By current amplifier in electric current
The input input sinusoidal current signal of sensor (1), current amplitude corresponding to record and current phase hysteresis, obtain second group
Data
Wherein U0To UmFor the amplitude of input voltage signal,ExtremelyDetected for voltage-phase
The hysteresis of electric current, I0To ImFor the amplitude of input current signal,ExtremelyDetected for current phase
The lagged value of circuit, m are the data arrived of the m times measurement；
Described point is carried out to first group of data and second group of data, and is fitted, respectively obtains voltage-phase feedback branch and electric current
The delayed phase of phase feedback branch road and the expression formula of input signal amplitude are as follows：
Wherein U is the amplitude of voltage signal, and I is the amplitude of current signal, and n is arbitrary positive integer, kUnLagged for voltage-phase
The coefficient of n item, k are corresponded in expression formulaInThe coefficient that n item is corresponded in expression formula, b are lagged for current phaseUC, bICRespectively
The constant term of voltage and current delayed phase expression formula, obtain the expression formula of phase lag error in transducer (13) work
Step 3, DSP (4) respectively sampled voltage sensor (2) and current sensor (1) output end, obtain voltage U and
Electric current I amplitude, substitute into phase lag error in transducer (13) workExpression formula obtain the phase difference to be compensated
Value, detect actual phase differenceThen real voltage current and phase difference
。
5. the ultrasonic-frequency power supply phase difference detection method according to claim 5 based on combined controller, it is characterised in that also
The step of including being compensated to testing result, specifically include：
Judge the step 3 acquired results real voltage current and phase differenceWhether 0 is equal to, if so, then keeping PWM frequency
Output, if it is not,
Then determine whether real voltage current and phase differenceWhether the effective range of phase-difference control is exceeded, if so, then weighing
New frequency sweep locking frequency, if it is not, then carrying out the output frequency that PID arithmetic accurately adjusts PWM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710872505.0A CN107727931B (en) | 2017-09-25 | 2017-09-25 | Ultrasonic power supply phase difference detection device and method based on combined controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710872505.0A CN107727931B (en) | 2017-09-25 | 2017-09-25 | Ultrasonic power supply phase difference detection device and method based on combined controller |
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| CN107727931B CN107727931B (en) | 2020-04-03 |
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