CN109709428A - A kind of source of high frequency current of waveform amplitude-frequency separation real-time control - Google Patents
A kind of source of high frequency current of waveform amplitude-frequency separation real-time control Download PDFInfo
- Publication number
- CN109709428A CN109709428A CN201910008147.8A CN201910008147A CN109709428A CN 109709428 A CN109709428 A CN 109709428A CN 201910008147 A CN201910008147 A CN 201910008147A CN 109709428 A CN109709428 A CN 109709428A
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- amplitude
- current
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Amplifiers (AREA)
Abstract
A kind of source of high frequency current of waveform amplitude-frequency separation real-time control provided by the present application, the original sampling data imported by PowerPC parsing, the amplitude and frequency parameter of signal are analyzed, calculates and controls signal with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and a-c cycle identical with sampling signal frequency；The coding output and transmission timing control of control signal are completed by FPGA module；DC voltage analog signal is generated by the first D/A converter module；Alternating voltage analog signal is generated by the second D/A converter module；High-frequency current signal is exported by power electronics formula current feedback circuit.The application combines the good high frequency output characteristic of conventional analog power amplifier test method and digital current source, can carry out the frequency runs such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing.
Description
Technical field
The present invention relates to current source technology field more particularly to a kind of high-frequency currents of waveform amplitude-frequency separation real-time control
Source.
Background technique
Direct current instrument transformer is the important primary equipment of DC transmission system construction and operation, is mentioned for the control and protection of system
For accurately and reliably metrical information, operational reliability and measurement accuracy are directly related to the safety and stability of DC transmission system
Operation.Mainly from external import, the country lacks accordingly DC electronic transformer used in China's DC transmission engineering at this stage
Development and production experience and debugging calibration means, mutual inductor and related measuring system can not especially be carried out at converter station scene
Effectively detection, can not assess the operating condition of direct current instrument transformer.In actual motion, the direct current instrument transformer of part converter station
Repeatedly there is the problems such as measurement is inaccurate, output signal drift is excessively high, interchannel data difference is larger, to converter station electrical energy measurement,
The various aspects such as protection control bring influence, have seriously affected the operation stability of DC transmission system.
It is past for the step response rapidity and frequency response accuracy for solving DC electronic transformer in engineer application
Toward the cutoff frequency that can improve its filter circuit, change its Transfer characteristic to high-frequency signal.Direct current system actual motion and event
Can be with a large amount of high-frequency signal during barrier, and the sampling rate of DC electronic transformer is generally 10kHz or 50kHz,
Frequency aliasing can be generated for more than half the high-frequency signal beyond its sampling rate, seriously affect the sampling essence of direct current instrument transformer
Degree.When carrying out high-frequency current test to DC electronic transformer at present, current mode power is generally controlled using signal generator
Amplifier come realize DC electronic transformer frequency response test, and frequency aliasing test do not carry out substantially.Current
Source of high frequency current can be divided into analog current source and digital current source；
(1) analog current source
Analog current source is the push-pull type linear power amplifier based on the control of small voltage signal as shown in Figure 1:, by mould
Quasi- device is constituted, and output electric current is unrelated with load, is constituted adjustment link by using power tube, is utilized the output that transistor is flat
Characteristic and profound and negative feedbck circuit available stable constant current output and high output impedance, realize the control of voltage verses current
System.
Analog source of high frequency current control mode such as Fig. 1 imports data waveform by host computer, generates real time data, will
Waveform real time data is sent to master cpu, and master cpu generates sample values according to voltage value export ratio and send to D/A chip,
Then control D/A chip exports small voltage signal, and it is defeated to control push-pull type linear current type power amplifier by small voltage signal
High frequency high current out.
(2) digital current source
It is realized using power electronic technique in digital current source.Based on PWM modulation technology, controlled using pwm modulator
The conducting and shutdown of electronic switch change the voltage at load both ends by controlling the duty ratio of power switch, to make to pass through
The electric current of load maintains to stablize, and exports stable current signal.
Output amplitude and frequency parameter is manually arranged in digital source of high frequency current control mode such as Fig. 2, changes
The output modulated signal and carrier signal of power electronics formula current feedback circuit, the on-off of control switch pipe, output amplitude and frequency
Variable high current analog quantity.
However, analog current source essence is a voltage-controlled type current source, realization principle is determined when output letter
When number frequency is higher, output loading induction reactance can become very high, so as to cause the distortion of output waveform.Therefore its high frequency output ability
With certain restrictions, high frequency output and High-current output can not be combined.Digital current source is real using power electronics mode
Existing, the quick on-off by controlling electronic switch realizes high-frequency signal output.It needs to manually control output signal amplitude before output
With frequency parameter, realizes that the amplitude of high-frequency current and frequency control by feedback regulation, be substantially a kind of fixed output type
Stable state source of high frequency current.Output signal parameter can not be adjusted during output in real time, is not had to live recorded wave file or emulation
The playback output function of sampling files.At present in the high-frequency current test for carrying out DC electronic transformer, generally pass through control
Current-mode Power Amplifier processed realizes that frequency response is tested to 3kHZ, lacks mixed to the frequency of higher frequency signal
Folded test, there are hidden danger in test content.
Therefore, it is necessary to reinforce the research to DC electronic transformer high frequency Transfer characteristic, exploitation have 10kHz~
The high frequency test current source of 50kHz range frequencies fan-out capability, to carry out the frequency response precision of DC electronic transformer, filtering is cut
The only frequency characteristic tests such as frequency, frequency aliasing effect.
Summary of the invention
The present invention provides a kind of source of high frequency current of waveform amplitude-frequency separation real-time control, have 10kHz~50kHz range
Rate-adaptive pacemaker ability can carry out the frequency such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing effect
Rate characteristic test.
The source of high frequency current of a kind of waveform amplitude-frequency separation real-time control provided by the present application, comprising: PowerPC, FPGA mould
Block, the first D/A converter module, the second D/A converter module and power electronics formula current feedback circuit；
The PowerPC is used to parse the original sampling data imported, analyzes the amplitude and frequency parameter of signal, calculate and
The direct current amplitude control signal of sampled signal amplitude in proportion relationship and a-c cycle identical with sampling signal frequency control letter
Number, it is input to FPGA module；
The FPGA module is used to complete coding output and the hair of direct current amplitude control signal and a-c cycle control signal
Send timing control；
First D/A converter module is used to be generated and sampled signal amplitude in proportion according to direct current amplitude control signal
The DC voltage analog signal of relationship；
Second D/A converter module be used for generate and sampled signal with frequency alternating voltage analog signal；
The power electronics formula current feedback circuit is simulated for DC voltage analog signal based on the received and alternating voltage
Signal exports high-frequency current signal as the control signal of amplitude and frequency.
Preferably, which further includes frequency modulation(PFM) module；
The frequency modulation(PFM) module is connected to second D/A converter module and the power electronics formula current feedback circuit
Between；
The sinusoidal alternating voltage for the same frequency that the frequency modulation(PFM) module is used to send second D/A converter module
Analog signal is converted to the alternating voltage analog signal of the square wave of corresponding same frequency.
Preferably, the PowerPC is specifically used for:
Every point sampling data are extracted from the original sampling data of importing, are actually adopted according to the reduction of cfg file configuration parameter
Sample value obtains sample variance signal；
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm, obtains the width of sample variance signal
Value parameter and frequency parameter；
According to preset ratio adjusting amplitude parameter size, the direct current amplitude control of output and sampled signal amplitude in proportion relationship
Signal processed generates a-c cycle identical with frequency parameter and controls signal.
Preferably, sample variance is obtained according to cfg file configuration parameter reduction actual sample value especially by the first formula
Signal；
First formula are as follows:
Wherein, S ' is actual samples, and S is crude sampling, CchnFor channel multiplying power, OchnFor channel offset, k is that sampling becomes
Than.
Preferably, frequency spectrum point is carried out to sample variance signal using fast Fourier transformation algorithm especially by the second formula
Analysis obtains the frequency parameter of sample variance signal；
Second formula are as follows:
Wherein, fnFor n-th signal frequency, fsFor sample frequency, n is signal serial number, and N is sampling number.
Preferably, frequency spectrum point is carried out to sample variance signal using fast Fourier transformation algorithm especially by third formula
Analysis obtains the frequency parameter of sample variance signal；
The third formula are as follows:
Wherein, AnFor n-th signal amplitude,The mould of negative value is calculated for n-th FFT, N is sampling number.
Preferably, first D/A converter module is encoded using the complement of two's two's complement, output voltage and input digital signal
Relationship are as follows:
Wherein, VoutFor output voltage, D is loaded the decimal equivalent of coding, V by DACrefFor benchmark voltage.
Preferably, the frequency modulation(PFM) module includes low-pass filter circuit and square wave modulation circuit；
The low-pass filter circuit is specially second order active low-pass filter circuit；
The square wave modulation circuit is specially in-phase proportion computing circuit.
Preferably, the circuit of the frequency modulation(PFM) module include: operational amplifier, resistance R11, resistance R12, resistance R13,
Resistance R14, capacitor CA10, capacitor CA11, capacitor CA12, diode；
The first end of the resistance R11 connects the input terminal of the frequency modulation(PFM) module, and the second end of the resistance R11 connects
Connect the first end of the resistance R12；
The second end of the resistance R12 connects the third end of the operational amplifier；
The first end of the resistance R13 is grounded, and the second end of the resistance R13 connects the first end of the resistance R14, institute
The second end for stating resistance R14 connects the output end of the frequency modulation(PFM) module；
The first end of the capacitor CA10 connects the second end of the resistance R11, the second end ground connection of the capacitor CA10；
The first end of the capacitor CA11 connects the second end of the resistance R11, the second end connection of the capacitor CA11
The output end of the frequency modulation(PFM) module；
The first end of the capacitor CA12 connects the second end of the resistance R12, the second end ground connection of the capacitor CA12；
One end of the diode connects the input terminal of the frequency modulation(PFM) module, the other end ground connection of the diode；
The second end of the operational amplifier connects the second end of the resistance R13, the 4th end of the operational amplifier
The power supply of connection -12V, the output end of frequency modulation(PFM) module described in the six end connecting of the operational amplifier, the operation are put
The power supply of 7th end connection+12V of big device.
Preferably, the power electronics formula current feedback circuit specifically is used to obtain the direct current small voltage signal amplitude of input,
The amplitude of itself output high current signal is scaled；Square wave small voltage signal is obtained, control internal power electronic device
It cut-offs, changes the frequency of output signal.
As can be seen from the above technical solutions, the invention has the following advantages that
The source of high frequency current of a kind of waveform amplitude-frequency separation real-time control provided by the present application, comprising: PowerPC, FPGA mould
Block, the first D/A converter module, the second D/A converter module and power electronics formula current feedback circuit；The PowerPC is for solving
The original sampling data imported is analysed, the amplitude and frequency parameter of signal are analyzed, is calculated and sampled signal amplitude in proportion relationship
Direct current amplitude control signal and a-c cycle identical with sampling signal frequency control signal, are input to FPGA module；It is described
FPGA module is used to complete the coding output of direct current amplitude control signal and a-c cycle control signal and transmission timing controls；Institute
The first D/A converter module is stated for generating the direct current with sampled signal amplitude in proportion relationship according to direct current amplitude control signal
Voltage analog signal；Second D/A converter module be used for generate and sampled signal with frequency alternating voltage analog signal；Institute
Power electronics formula current feedback circuit is stated for DC voltage analog signal based on the received and alternating voltage analog signal as width
The control signal of value and frequency exports high-frequency current signal.The application combine conventional analog power amplifier test method with it is digital
The good high frequency output characteristic of current source, frequency response precision, filter cutoff frequency, the frequency that can carry out DC electronic transformer are mixed
It is folded to wait frequency runs；Rear end output uses power electronics formula current feedback circuit, solves traditional analog formula function from principle
The high frequency limitation problem for putting output signal has the signal fan-out capability within the scope of 50kHz；It is controlled using amplitude and frequency separation
Technology increases the application scenarios and pilot project in digital current source without the manual setting output signal parameter before output
Type；Have sampling files importing and signal spectral analysis ability, can realize the width of output signal Yu crude sampling file automatically
Value, frequency matching, under the premise of guaranteeing output accuracy, improve the using flexible of source of high frequency current.
Detailed description of the invention
It in order to illustrate the embodiments of the present invention more clearly, below will be to required use in embodiment or description of the prior art
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the schematic diagram that the application is used to illustrate analog current source in the prior art；
Fig. 2 is the schematic diagram that the application is used to illustrate digital current source in the prior art；
Fig. 3 is showing for the one embodiment for the source of high frequency current that a kind of waveform amplitude-frequency provided by the present application separates real-time control
It is intended to；
Fig. 4 is another embodiment of the source of high frequency current that a kind of waveform amplitude-frequency provided by the present application separates real-time control
Schematic diagram；
Fig. 5 is the schematic illustration for the source of high frequency current that a kind of waveform amplitude-frequency provided by the present application separates real-time control；
Fig. 6 is that a kind of waveform amplitude-frequency provided by the present application separates frequency modulation module in the source of high frequency current of real-time control
Circuit diagram.
Specific embodiment
The present invention provides a kind of source of high frequency current of waveform amplitude-frequency separation real-time control, have 10kHz~50kHz range
Rate-adaptive pacemaker ability can carry out the frequency such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing effect
Rate characteristic test.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 3, an a kind of implementation of the source of high frequency current of waveform amplitude-frequency separation real-time control provided by the present application
Example, comprising: PowerPC, FPGA module, the first D/A converter module, the second D/A converter module and power electronics formula electric current hair
Raw device；
PowerPC is used to parse the original sampling data imported, analyzes the amplitude and frequency parameter of signal, calculates and samples
The direct current amplitude control signal of the proportional relationship of signal amplitude and a-c cycle identical with sampling signal frequency control signal, defeated
Enter to FPGA module；
When FPGA module is used to complete the coding output of direct current amplitude control signal and a-c cycle control signal and sends
Sequence control；
First D/A converter module is used to be generated and sampled signal amplitude in proportion relationship according to direct current amplitude control signal
DC voltage analog signal；
Second D/A converter module be used for generate and sampled signal with frequency alternating voltage analog signal；
Power electronics formula current feedback circuit is for DC voltage analog signal based on the received and alternating voltage analog signal
High-frequency current signal is exported as the control signal of amplitude and frequency.
In the present embodiment, the second D/A converter module can arrange in pairs or groups with power electronics formula current feedback circuit and use, i.e., the second number
Mould conversion module, which can issue square-wave signal either power electronics formula current feedback circuit, can handle sinusoidal signal.
The application combines the good high frequency output characteristic of conventional analog power amplifier test method and digital current source, can
Carry out the frequency runs such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing；Rear end output is adopted
It with electric power electronic current generator, solves the high frequency limitation problem of traditional analog formula power amplifier output signal from principle, has
Signal fan-out capability within the scope of standby 50kHz；Using amplitude and frequency separation control technology, it is defeated to be not necessarily to the manual setting before output
Signal parameter out increases the application scenarios and pilot project type in digital current source；Have sampling files importing and signal
Spectrum analysis ability can realize that output signal is matched with the amplitude of crude sampling file, frequency automatically, guarantee output accuracy
Under the premise of, improve the using flexible of source of high frequency current.
It is to a kind of one embodiment of the source of high frequency current of waveform amplitude-frequency separation real-time control provided by the present application above
It is described in detail, below by the another of the source of high frequency current to a kind of waveform amplitude-frequency separation real-time control provided by the present application
A embodiment is described in detail.
Referring to Fig. 4, a kind of another reality of the source of high frequency current of waveform amplitude-frequency separation real-time control provided by the present application
Apply example, comprising: PowerPC, FPGA module, the first D/A converter module, the second D/A converter module and power electronics formula electric current
Generator；
PowerPC is used to parse the original sampling data imported, analyzes the amplitude and frequency parameter of signal, calculates and samples
The direct current amplitude control signal of the proportional relationship of signal amplitude and a-c cycle identical with sampling signal frequency control signal, defeated
Enter to FPGA module；
When FPGA module is used to complete the coding output of direct current amplitude control signal and a-c cycle control signal and sends
Sequence control (for controlling the first D/A converter module and the second D/A converter module)；
First D/A converter module is used to be generated and sampled signal amplitude in proportion relationship according to direct current amplitude control signal
DC voltage analog signal；
Second D/A converter module be used for generate and sampled signal with frequency alternating voltage analog signal；
Power electronics formula current feedback circuit is for DC voltage analog signal based on the received and alternating voltage analog signal
High-frequency current signal is exported as the control signal of amplitude and frequency.
The current source further includes frequency modulation(PFM) module；
Frequency modulation(PFM) module is connected between the second D/A converter module and power electronics formula current feedback circuit；
The sinusoidal alternating voltage analog signal for the same frequency that frequency modulation(PFM) module is used to send the second D/A converter module
Be converted to the alternating voltage analog signal of the square wave of corresponding same frequency.
Referring to Fig. 3, dotted line frame in for waveform amplitude-frequency separate real-time control high-frequency current source device, by PowerPC,
FPGA, D/A converter module, frequency modulation(PFM) module, power electronics formula current feedback circuit composition.PowerPC parsing imports original
Sampled data analyzes the amplitude and frequency parameter of signal, calculates amplitude proportion and reduces signal and with the small sample of frequency, input
To FPGA module；FPGA module controls D/A converter module according to interactive output signal parameter, generates press crude sampling respectively
Amplitude proportion reduce direct current small voltage analog signal and with crude sampling with the AC sine small voltage analog signal of frequency；Digital-to-analogue
Conversion module is responsible for the digital quantity signal that FPGA is exported being converted to analog signals；Frequency modulation(PFM) module is responsible for exchanging same frequency
Sinusoidal small voltage analog quantity is converted to corresponding square wave small voltage analog quantity；Power electronics formula current feedback circuit receives DC simulation
Amount and square wave Analog control signal, export final high frequency high current signal.
PowerPC is specifically used for:
Every point sampling data are extracted from the original sampling data of importing, are actually adopted according to the reduction of cfg file configuration parameter
Sample value obtains sample variance signal；
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm, obtains the width of sample variance signal
Value parameter and frequency parameter；
According to preset ratio adjusting amplitude parameter size, the direct current amplitude control of output and sampled signal amplitude in proportion relationship
Signal processed generates a-c cycle identical with frequency parameter and controls signal.
Sample variance signal is obtained according to cfg file configuration parameter reduction actual sample value especially by the first formula；
First formula are as follows:
Wherein, S ' is actual samples, and S is crude sampling, CchnFor channel multiplying power, OchnFor channel offset, k is that sampling becomes
Than.
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm especially by the second formula, is obtained
The frequency parameter of sample variance signal；
Second formula are as follows:
Wherein, fnFor n-th signal frequency, fsFor sample frequency, n is signal serial number, and N is sampling number.
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm especially by third formula, is obtained
The frequency parameter of sample variance signal；
Third formula are as follows:
Wherein, AnFor n-th signal amplitude,The mould of negative value is calculated for n-th FFT, N is sampling number.
PowerPC completes the works such as system initialization and self-test, sampled data importing, signal spectral analysis, data prediction
Make.According to the sampled data file of importing, the amplitude and frequency parameter of decomposed signal are generated and sampled signal amplitude by calculating
The direct current amplitude control signal of proportional relationship and a-c cycle identical with sampling signal frequency control signal, realize to electric current
The pretreatment work of source operation related control data.
PowerPC uses the MPC8247 embedded microprocessor of Freescale company, which belongs to
PowerQUICC II series, kernel and a communication process kernel CPM comprising one based on PowerPC MPC603e.Tool
There are powerful processing capacity and higher integrated level, reduces the composition expense of system, simplify the design of circuit board, reduce
Power consumption.
FPGA completes direct current amplitude control signal and a-c cycle controls signal under the control of high precision clock module
Coding output and transmission timing control, cooperation PowerPC module reappears the amplitude and frequency information of crude sampling file, and drives
D/A converter module exports corresponding small voltage analog signals.
FPGA processor uses the Spartan3 series of products XC3S1500 of Xilinx, includes 1,500,000 system doors, and 32
A special multiplier, 4 digital dock management modules, logical resource is abundant, and the speed of service is fast.
D/A converter module includes the first D/A converter module and the second D/A converter module, for receiving the number of FPGA
Driving signal is converted to corresponding small voltage analog signals, realizes that the control in digital control loop and simulation output circuit is believed
Number interactive interface.
D/A converter module is realized by dedicated DAC modulus conversion chip.Using 16 high-precisions, voltage output type
DAC converter AD5764.AD5764 has synchronous 4 channels, 16 no missing code resolution ratio, and integral nonlinearity (INL) error is ±
The advantages that sampling rate of 1LSB, up to 1.26M.Numerical portion uses complement code mode to indicate, analog output voltage range-
10v to+10v.
First D/A converter module is encoded using the complement of two's two's complement, output voltage and input digital signal relationship are as follows:
Wherein, VoutFor output voltage, D is loaded the decimal equivalent of coding, V by DACrefFor benchmark voltage.
The principle of the application will be explained below:
Such as Fig. 5, original sampled data file is imported by step 1 first, is then carried out by step 2 to data are imported
Fourier analysis obtains the amplitude information and frequency information of sampled signal, in step 3, by small voltage respectively to electricity respectively
The amplitude and frequency in stream source are controlled.Finally by step 4, output and the big electricity of the consistent high frequency of crude sampling file data
Flow signal.
Step 1: sampling files import
The high-frequency current sampling files generated by live recording or modeling and simulating are imported, check the reasonability of file, are read
The configuration information and sampling channel parameter information of sampling files parse sampled data file and calculate the actual samples of sampling channel
Value.Sampling files use COMTEADE electric system transient data general format, CFG configuration file including ASCII fromat and
The DAT data file of binary system or ASCII fromat.
It parses CFG configuration file line by line first and determines data boundary by byte 0x2c as data delimiter, obtain
Sampling channel parameter, sample frequency and total sampling number.Then sampling files Command Line Parsing DAT data file is pressed, if data
File is stored by binary format, after determining the memory space that every point sampling data occupy, obtains every point data address offset
And read every point sampling data；If data file is stored by ASCII fromat, every row first byte in file is determined according to newline
Address offset amount, and obtain every point sampling data according to the fixed format of sampling sequence number, sampling time and sampled value.
After obtaining every point sampling data, actual sample value is restored according to cfg file configuration parameter, such as following formula:
Wherein: S ' is actual samples, and S is crude sampling, CchnFor channel multiplying power, OchnFor channel offset, k is that sampling becomes
Than；
Step 2: signal analysis and calculating
Using fast Fourier transformation algorithm (FFT), spectrum analysis is carried out to the sample variance signal that step 1 obtains, is obtained
Take its amplitude and frequency parameter.It is calculated by FFT and obtains N point complex values, then the n-th signal frequency for including in original signal
Are as follows:
Wherein: fnFor n-th signal frequency, fsFor sample frequency, n is signal serial number, and N is sampling number；
The amplitude of n-th signal are as follows:
Wherein: AnFor n-th signal amplitude,The mould of negative value is calculated for n-th FFT, N is sampling number；
After the completion of FFT is calculated, by AnIt is scaled, the amplitude A ' of small voltage direct current signal is obtained, step 3 control is used for
The amplitude of current source output signal processed；Simultaneously virtually and fnWith the small voltage AC sine signal of frequency, and calculate its instantaneous value sequence
Arrange Sn, the frequency of the control current source output signal of waiting step three.
Step 3: frequency width separation control
Step 2 calculates the direct current signal data of crude sampling amplitude proportion diminution, and amplitude is A ', turns by digital-to-analogue
It changes and generates the identical small voltage DC analogue quantity signal of amplitude, can control the amplitude of back end current source output signal.
It is encoded using the complement of two's two's complement, output voltage and digital signal relationship are as follows:
Wherein: VoutFor output voltage, D is loaded the decimal equivalent of coding, V by DACrefFor benchmark voltage；
Step 2 has also calculated small voltage AC sine signal data of the crude sampling with frequency, frequency fn, pass through
Digital-to-analogue conversion generates the identical small voltage ac analog signal of frequency and is reconverted into the small of same frequency by frequency modulation process
Voltage square wave analog signals can control the frequency of back end current source output signal.
Frequency modulation procedure is based on in-phase proportion computing circuit, utilizes the Transfer characteristic of its saturation region data, adjustment feedback
The ratio of resistance allows input sinusoidal signal to be rapidly saturated, exports the square-wave signal of same frequency in real time.
Step 4: high-frequency current output
Direct current small voltage signal and square wave small voltage signal that step 3 generates are synchronized and be input to current feedback circuit, is passed through
Time control and transmission delay compensation are exported, guarantees that the output delay error between two groups of analog signals is less than 1us, realizes electric current
The amplitude-frequency of generator separates control.
Power electronics current feedback circuit obtains the direct current small voltage signal amplitude of input, and the big electricity of itself output is scaled
Flow the amplitude of signal；Square wave small voltage signal is obtained, cut-offfing for control internal power electronic device changes the frequency of output signal
Rate.By adjusting the amplitude and frequency of control small voltage signal, the output current characteristic of current feedback circuit can be changed in real time.
By step 1 to step 4, the amplitude information of original sampling data is separated with frequency information, is separately converted to
Associated small voltage controls signal, and the output of synchronization driving power electronic current generator realizes oneself of digital current source
Dynamic real-time control.
Referring to Fig. 6, frequency modulation(PFM) module includes low-pass filter circuit and square wave modulation circuit；
Low-pass filter circuit is specially second order active low-pass filter circuit；
Square wave modulation circuit is specially in-phase proportion computing circuit.
The circuit of frequency modulation(PFM) module includes: operational amplifier, resistance R11, resistance R12, resistance R13, resistance R14, electricity
Hold CA10, capacitor CA11, capacitor CA12, diode；
The input terminal of the first end rate of connections modulation module of resistance R11, the second end connection resistance R12's of resistance R11
First end；
The third end of the second end connection operational amplifier of resistance R12；
The first end of resistance R13 is grounded, the first end of the second end connection resistance R14 of resistance R13, and the second of resistance R14
Hold the output end of rate of connections modulation module；
The second end of the first end connection resistance R11 of capacitor CA10, the second end ground connection of capacitor CA10；
The second end of the first end connection resistance R11 of capacitor CA11, the second end rate of connections modulation module of capacitor CA11
Output end；
The second end of the first end connection resistance R12 of capacitor CA12, the second end ground connection of capacitor CA12；
The input terminal of one end rate of connections modulation module of diode, the other end ground connection of diode；
The second end of the second end connection resistance R13 of operational amplifier, the electricity of the 4th end connection -12V of operational amplifier
Source, the output end of the six end connecting frequency modulation(PFM) module of operational amplifier, the electricity of the 7th end connection+12V of operational amplifier
Source.
By frequency modulation(PFM) module, the High-frequency Interference amount in original sampled signal is filtered out, extracted valid data information generates
With initial sinusoids sampling with the square-wave frequency modulation voltage signal of frequency, realizes and the output frequency of back end current generator is controlled.
Low-pass filtering circuit uses second order active low-pass filter circuit, Parameter adjustable, by changing resistance R11, R12 and electricity
Hold the size of C11, C12, can adjust the cutoff frequency of filter circuit output signal, obtains interference signal and filter out at ability and signal
Manage the balance of delay.
Square-wave frequency modulation circuit uses in-phase proportion computing circuit, by the resistance value for adjusting resistance R13, R14, thus it is possible to vary defeated
The proportionate relationship of signal and input signal out will be originally inputted sinusoidal letter using the working characteristics of operational amplifier zone of saturation
Number with frequency it is squared, with realize the frequency of current feedback circuit output signal is controlled.
Power electronics formula current feedback circuit specifically is used to obtain the direct current small voltage signal amplitude of input, is scaled certainly
The amplitude of body output high current signal；Square wave small voltage signal is obtained, control internal power electronic device is cut-off, and changes output
The frequency of signal.
It is small by direct current small voltage amplitude control signal and square wave using the strong current generator based on power electronics principle
Electric voltage frequency controls signal, and the output of real-time synchronization driving current generator generates the high-current test analog signals of high frequency.
Current feedback circuit uses power electronics high-frequency current generator, and output electric current 0 arrives 100A, and frequency range 10KHZ is arrived
50KHZ, frequency accuracy are ± 50ppm, and ± 5ppm/ DEG C of frequency temperature drift, output current distortion degree is better than 0.5%, output
Current stability, is better than 0.02%/1min.
The application has following technical characterstic:
(1) amplitude and frequency parameter that output electric current is controlled based on amplitude-frequency isolation technics, by contracting in sample magnitude ratio
Small d. c. voltage signal controls current source output amplitude, controls current source by square wave voltage signal identical with sample frequency
Output frequency；
(2) it supports sampling files to import control, the amplitude-frequency characteristic of crude sampling, the big electricity of real-time control high frequency can be automatically analyzed
The analog output in stream source；
(3) by the digital-to-analogue conversion process of FPGA driving control signal, have good timing control and oncurrent processing ability,
The synchronism of amplitude control signal and frequency control signal be ensure that, it can be achieved that accurate adjusting to current source output characteristics；
(4) the saturation region operation characteristic for utilizing in-phase proportion computing circuit, is realized to high frequency just by complete analog circuit
The squared modulation of the same frequency of string signal.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control characterized by comprising PowerPC, FPGA module,
First D/A converter module, the second D/A converter module and power electronics formula current feedback circuit；
The PowerPC is used to parse the original sampling data imported, analyzes the amplitude and frequency parameter of signal, calculates and samples
The direct current amplitude control signal of the proportional relationship of signal amplitude and a-c cycle identical with sampling signal frequency control signal, defeated
Enter to the FPGA module；
When the FPGA module is used to complete the coding output of direct current amplitude control signal and a-c cycle control signal and sends
Sequence control；
First D/A converter module is used to be generated and sampled signal amplitude in proportion relationship according to direct current amplitude control signal
DC voltage analog signal；
Second D/A converter module be used for generate and sampled signal with frequency alternating voltage analog signal；
The power electronics formula current feedback circuit is for DC voltage analog signal based on the received and alternating voltage analog signal
High-frequency current signal is exported as the control signal of amplitude and frequency.
2. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 1, which is characterized in that also wrap
Include frequency modulation(PFM) module；
The frequency modulation(PFM) module is connected between second D/A converter module and the power electronics formula current feedback circuit；
The sinusoidal alternating voltage simulation for the same frequency that the frequency modulation(PFM) module is used to send second D/A converter module
Signal is converted to the alternating voltage analog signal of the square wave of corresponding same frequency.
3. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 1, which is characterized in that described
PowerPC is specifically used for:
Every point sampling data are extracted from the original sampling data of importing, restore actual sample value according to cfg file configuration parameter,
Obtain sample variance signal；
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm, obtains the amplitude ginseng of sample variance signal
Several and frequency parameter；
According to preset ratio adjusting amplitude parameter size, the direct current amplitude of output and sampled signal amplitude in proportion relationship, which controls, to be believed
Number, it generates a-c cycle identical with frequency parameter and controls signal.
4. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 3, which is characterized in that specific
Actual sample value, which is restored, according to cfg file configuration parameter by the first formula obtains sample variance signal；
First formula are as follows:
Wherein, S ' is actual samples, and S is crude sampling, CchnFor channel multiplying power, OchnFor channel offset, k is sampling no-load voltage ratio.
5. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 3, which is characterized in that specific
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm by the second formula, obtains sample variance signal
Frequency parameter；
Second formula are as follows:
Wherein, fnFor n-th signal frequency, fsFor sample frequency, n is signal serial number, and N is sampling number.
6. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 3, which is characterized in that specific
Spectrum analysis is carried out to sample variance signal using fast Fourier transformation algorithm by third formula, obtains sample variance signal
Frequency parameter；
The third formula are as follows:
Wherein, AnFor n-th signal amplitude,The mould of negative value is calculated for n-th FFT, N is sampling number.
7. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 1, which is characterized in that described
First D/A converter module is encoded using the complement of two's two's complement, output voltage and input digital signal relationship are as follows:
Wherein, VoutFor output voltage, D is loaded the decimal equivalent of coding, V by DACrefFor benchmark voltage.
8. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 2, which is characterized in that described
Frequency modulation(PFM) module includes low-pass filter circuit and square wave modulation circuit；
The low-pass filter circuit is specially second order active low-pass filter circuit；
The square wave modulation circuit is specially in-phase proportion computing circuit.
9. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 8, which is characterized in that described
The circuit of frequency modulation(PFM) module includes: operational amplifier, resistance R11, resistance R12, resistance R13, resistance R14, capacitor CA10, electricity
Hold CA11, capacitor CA12, diode；
The first end of the resistance R11 connects the input terminal of the frequency modulation(PFM) module, and the second end of the resistance R11 connects institute
State the first end of resistance R12；
The second end of the resistance R12 connects the third end of the operational amplifier；
The first end of the resistance R13 is grounded, and the second end of the resistance R13 connects the first end of the resistance R14, the electricity
The second end of resistance R14 connects the output end of the frequency modulation(PFM) module；
The first end of the capacitor CA10 connects the second end of the resistance R11, the second end ground connection of the capacitor CA10；
The first end of the capacitor CA11 connects the second end of the resistance R11, described in the second end connection of the capacitor CA11
The output end of frequency modulation(PFM) module；
The first end of the capacitor CA12 connects the second end of the resistance R12, the second end ground connection of the capacitor CA12；
One end of the diode connects the input terminal of the frequency modulation(PFM) module, the other end ground connection of the diode；
The second end of the operational amplifier connects the second end of the resistance R13, the 4th end connection-of the operational amplifier
The power supply of 12V, the output end of frequency modulation(PFM) module described in the six end connecting of the operational amplifier, the operational amplifier
The power supply of 7th end connection+12V.
10. a kind of source of high frequency current of waveform amplitude-frequency separation real-time control according to claim 1, which is characterized in that
The power electronics formula current feedback circuit specifically is used to obtain the direct current small voltage signal amplitude of input, is scaled certainly
The amplitude of body output high current signal；Square wave small voltage signal is obtained, control internal power electronic device is cut-off, and changes output
The frequency of signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008147.8A CN109709428B (en) | 2019-01-04 | 2019-01-04 | High-frequency current source with waveform amplitude-frequency separation real-time control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008147.8A CN109709428B (en) | 2019-01-04 | 2019-01-04 | High-frequency current source with waveform amplitude-frequency separation real-time control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109709428A true CN109709428A (en) | 2019-05-03 |
| CN109709428B CN109709428B (en) | 2021-05-28 |
Family
ID=66260793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910008147.8A Active CN109709428B (en) | 2019-01-04 | 2019-01-04 | High-frequency current source with waveform amplitude-frequency separation real-time control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109709428B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009197A (en) * | 2021-02-08 | 2021-06-22 | 中山职业技术学院 | Amplitude-frequency adjustable power source |
| CN113468837A (en) * | 2021-05-10 | 2021-10-01 | 浙江大学 | Method and system for estimating salient fast current of chip power supply network |
| CN113960364A (en) * | 2021-09-30 | 2022-01-21 | 陕西航空电气有限责任公司 | Frequency determination method and device suitable for wide-frequency-conversion alternating-current power generation system |
| CN114221527A (en) * | 2022-02-22 | 2022-03-22 | 深圳市深澳视觉科技有限公司 | Alternating current-direct current energy conversion control circuit and high-frequency medical equipment |
| CN116090570A (en) * | 2023-04-12 | 2023-05-09 | 合肥本源量子计算科技有限责任公司 | Quantum bit state regulation and control circuit, measurement and control circuit and quantum computer |
| CN117236262A (en) * | 2023-11-15 | 2023-12-15 | 深圳市恒运昌真空技术有限公司 | Analysis method and system for output power amplification coefficient of radio frequency power supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332922A (en) * | 2011-07-25 | 2012-01-25 | 复旦大学 | Current source and drive circuit for improving high frequency characteristic of digital analog converter |
| CN102525456A (en) * | 2012-01-11 | 2012-07-04 | 中国人民解放军国防科学技术大学 | Voltage control current source for electrical impedance tomography |
| CN103543430A (en) * | 2013-09-27 | 2014-01-29 | 广东电网公司电力科学研究院 | Standard modulus synchronous signal source |
| WO2015112103A1 (en) * | 2014-01-22 | 2015-07-30 | Durukan Coşkun | Training and experiment system supported by an animation based full simulation method |
| CN105232041A (en) * | 2014-07-07 | 2016-01-13 | 北京大学深圳研究生院 | Measuring device for electrical characteristic distribution of human body surface, data terminal and method |
| CN105656489A (en) * | 2016-03-08 | 2016-06-08 | 天津大学 | Exciting current source for bioelectrical impedance imaging |
-
2019
- 2019-01-04 CN CN201910008147.8A patent/CN109709428B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332922A (en) * | 2011-07-25 | 2012-01-25 | 复旦大学 | Current source and drive circuit for improving high frequency characteristic of digital analog converter |
| CN102525456A (en) * | 2012-01-11 | 2012-07-04 | 中国人民解放军国防科学技术大学 | Voltage control current source for electrical impedance tomography |
| CN103543430A (en) * | 2013-09-27 | 2014-01-29 | 广东电网公司电力科学研究院 | Standard modulus synchronous signal source |
| WO2015112103A1 (en) * | 2014-01-22 | 2015-07-30 | Durukan Coşkun | Training and experiment system supported by an animation based full simulation method |
| CN105232041A (en) * | 2014-07-07 | 2016-01-13 | 北京大学深圳研究生院 | Measuring device for electrical characteristic distribution of human body surface, data terminal and method |
| CN105656489A (en) * | 2016-03-08 | 2016-06-08 | 天津大学 | Exciting current source for bioelectrical impedance imaging |
Non-Patent Citations (1)
| Title |
|---|
| 王红星等: "电子式互感器交直流一体化测试技术", 《广东电力》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009197A (en) * | 2021-02-08 | 2021-06-22 | 中山职业技术学院 | Amplitude-frequency adjustable power source |
| CN113468837A (en) * | 2021-05-10 | 2021-10-01 | 浙江大学 | Method and system for estimating salient fast current of chip power supply network |
| CN113468837B (en) * | 2021-05-10 | 2023-11-03 | 浙江大学 | Method and system for estimating current of chip power supply network bump |
| CN113960364A (en) * | 2021-09-30 | 2022-01-21 | 陕西航空电气有限责任公司 | Frequency determination method and device suitable for wide-frequency-conversion alternating-current power generation system |
| CN114221527A (en) * | 2022-02-22 | 2022-03-22 | 深圳市深澳视觉科技有限公司 | Alternating current-direct current energy conversion control circuit and high-frequency medical equipment |
| CN114221527B (en) * | 2022-02-22 | 2022-05-20 | 深圳市深澳视觉科技有限公司 | Alternating current-direct current energy conversion control circuit and high-frequency medical equipment |
| CN116090570A (en) * | 2023-04-12 | 2023-05-09 | 合肥本源量子计算科技有限责任公司 | Quantum bit state regulation and control circuit, measurement and control circuit and quantum computer |
| CN116090570B (en) * | 2023-04-12 | 2024-02-23 | 本源量子计算科技（合肥）股份有限公司 | Quantum bit state regulation and control circuit, measurement and control circuit and quantum computer |
| CN117236262A (en) * | 2023-11-15 | 2023-12-15 | 深圳市恒运昌真空技术有限公司 | Analysis method and system for output power amplification coefficient of radio frequency power supply |
| CN117236262B (en) * | 2023-11-15 | 2024-03-19 | 深圳市恒运昌真空技术股份有限公司 | Analysis method and system for output power amplification coefficient of radio frequency power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109709428B (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109709428A (en) | A kind of source of high frequency current of waveform amplitude-frequency separation real-time control | |
| CN209296902U (en) | A kind of source of high frequency current | |
| CN101149425B (en) | Electronic electric energy meter debugging, checkout automated system | |
| CN105203983A (en) | Flexible alternating current/direct current electronic transformer checking device based on mixed sampling | |
| CN101718856A (en) | Calibration system of digital quantity input type electric energy meter | |
| CN205067713U (en) | Flexible alternating current -direct current electronic transformer calibration equipment based on mix sampling | |
| CN103941211B (en) | A kind of analog input merge cells automatic Verification method | |
| CN109655776A (en) | The broadband properties test macro and method of ground electrode circuit DC current transformer | |
| CN102375106A (en) | Device for testing harmonic influence of electronic mutual inductor | |
| CN114019297B (en) | High-frequency transient characteristic signal generating device of distribution line and control method thereof | |
| CN109507627A (en) | A kind of DC electronic transformer emulation mode | |
| CN113193801B (en) | High-speed motor simulator control system and high-speed motor simulator | |
| CN201188128Y (en) | Automatization system for debugging and checking electronic type electric energy meter | |
| CN201166685Y (en) | Wide band high voltage intelligent resistance voltage division type voltage sensor | |
| CN105067851B (en) | A kind of signal generation apparatus for electric system live testing instrument verification | |
| CN206292324U (en) | A kind of frequency-characteristic measuring-testing instrument | |
| CN208902817U (en) | The test platform of current transformer | |
| CN209486284U (en) | A kind of power source | |
| CN101464501B (en) | Calibrating apparatus for electric energy quality test analyzer | |
| CN204479673U (en) | A kind of novel alternating current electronic load | |
| CN217306018U (en) | Transformer substation training system for realizing small signal simulation | |
| CN203376440U (en) | Three-phase distribution induction withstand voltage test instrument | |
| CN114978366A (en) | ARINC664 bus signal calibration source device | |
| CN205139190U (en) | Can edit square wave generating device of code element | |
| CN106125033A (en) | A kind of voltage x current synchronicity classification error testing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |