CN209296902U - A kind of source of high frequency current - Google Patents
A kind of source of high frequency current Download PDFInfo
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- CN209296902U CN209296902U CN201920012440.7U CN201920012440U CN209296902U CN 209296902 U CN209296902 U CN 209296902U CN 201920012440 U CN201920012440 U CN 201920012440U CN 209296902 U CN209296902 U CN 209296902U
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Abstract
A kind of source of high frequency current provided by the present application, comprising: FPGA module, the first D/A converter module, the second D/A converter module and power electronics formula current feedback circuit；The FPGA module is controlled for receiving with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and a-c cycle identical with sampling signal frequency control signal, the coding output and transmission timing for completing direct current amplitude control signal and a-c cycle control signal；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 utility model relates to current source technology field more particularly to a kind of source of high frequency current.
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.
Utility model content
The utility model provides a kind of source of high frequency current, has 10kHz~50kHz range frequencies fan-out capability, can
Carry out the frequency characteristic tests such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing effect.
A kind of source of high frequency current provided by the present application, comprising: FPGA module, the first D/A converter module, the second digital-to-analogue turn
Change the mold block and power electronics formula current feedback circuit；
The FPGA module is separately connected first D/A converter module and second D/A converter module, and described
Two D/A converter modules connect the power electronics formula current feedback circuit；
The FPGA module for receive with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and with adopt
The identical a-c cycle of sample signal frequency controls signal, completes the coding of direct current amplitude control signal and a-c cycle control signal
Output and transmission 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, 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.
Preferably, first D/A converter module is DAC modulus conversion chip.
Preferably, second D/A converter module is DAC modulus conversion chip.
Preferably, the FPGA module includes system gate circuit, special multiplier and digital dock management module.
Preferably, the diode is specially Transient Suppression Diode.
As can be seen from the above technical solutions, the utility model has the advantage that
A kind of source of high frequency current provided by the present application, comprising: FPGA module, the first D/A converter module, the second digital-to-analogue turn
Change the mold block and power electronics formula current feedback circuit；The FPGA module is straight with sampled signal amplitude in proportion relationship for receiving
It flows amplitude control signal and a-c cycle identical with sampling signal frequency controls signal, complete direct current amplitude control signal and hand over
Flow the coding output and transmission timing control of frequency control signal；First D/A converter module is used for according to direct current amplitude control
Signal processed generates the DC voltage analog signal with sampled signal amplitude in proportion relationship；Second D/A converter module is used for
Generate and sampled signal with frequency alternating voltage analog signal；The power electronics formula current feedback circuit is for straight based on the received
Voltage analog signal and alternating voltage analog signal, which are flowed, as the control signal of amplitude and frequency exports high-frequency current signal.This Shen
Incorporated by reference to the good high frequency output characteristic of conventional analog power amplifier test method and digital current source, DC electronic can be carried out
The frequency runs such as the frequency response precision of formula mutual inductor, filter cutoff frequency, frequency aliasing；Rear end output uses power electronics formula
Current feedback circuit solves the high frequency limitation problem of traditional analog formula power amplifier output signal from principle, has within the scope of 50kHz
Signal fan-out capability.
Detailed description of the invention
It, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of the utility model embodiment
The attached drawing used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
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 a kind of schematic diagram of one embodiment of source of high frequency current provided by the present application；
Fig. 4 is a kind of schematic diagram of another embodiment of source of high frequency current provided by the present application；
Fig. 5 is the circuit diagram of frequency modulation module in a kind of source of high frequency current provided by the present application.
Specific embodiment
The utility model provides a kind of source of high frequency current, has 10kHz~50kHz range frequencies fan-out capability, can
Carry out the frequency characteristic tests such as the frequency response precision of DC electronic transformer, filter cutoff frequency, frequency aliasing effect.
It, below will knot to enable the purpose of utility model, feature, advantage of the utility model more obvious and understandable
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only the utility model a part of the embodiment, and not all embodiment.Based on this reality
It is obtained by those of ordinary skill in the art without making creative efforts all other with the embodiment in novel
Embodiment is fallen within the protection scope of the utility model.
Referring to Fig. 3, a kind of one embodiment of source of high frequency current provided by the present application, comprising: FPGA module 101,
One D/A converter module 102, the second D/A converter module 103 and power electronics formula current feedback circuit 104；
FPGA module 101 is separately connected the first D/A converter module 102 and the second D/A converter module 103, the second digital-to-analogue
Conversion module 103 connects power electronics formula current feedback circuit 104；
FPGA module 101 for receives and the direct current amplitude control signal of sampled signal amplitude in proportion relationship and with sampling
The identical a-c cycle of signal frequency controls signal, completes direct current amplitude control signal and the coding of a-c cycle control signal is defeated
Out and transmission timing controls；
It should be noted that frequently with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and with sampled signal
The identical a-c cycle control signal of rate can be provided by equipment such as PC machine or PowerPC, usually amplitude signal and sine
Signal can be encoded by FPGA module 101 and be exported, and be completed to synchronize by FPGA module 101.
First D/A converter module 102 is used to be generated according to direct current amplitude control signal and close with sampled signal amplitude in proportion
The DC voltage analog signal of system；
Second D/A converter module 103 be used for generate and sampled signal with frequency alternating voltage analog signal；
Power electronics formula current feedback circuit 104 is believed for DC voltage analog signal based on the received and alternating voltage simulation
Number as the control signal of amplitude and frequency export high-frequency current signal.
In the present embodiment, the second D/A converter module 103 can arrange in pairs or groups with power electronics formula current feedback circuit 104 and use, i.e.,
Second D/A converter module 103, which can issue square-wave signal either power electronics formula current feedback circuit 104, 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
With electric power electronic current generator 104, solve the high frequency limitation problem of traditional analog formula power amplifier output signal from principle,
Has the signal fan-out capability within the scope of 50kHz.
It is that a kind of one embodiment of source of high frequency current provided by the present application is described in detail above, it below will be right
A kind of another embodiment of source of high frequency current provided by the present application is described in detail.
Referring to Fig. 4, a kind of another embodiment of source of high frequency current provided by the present application, comprising: FPGA module 101,
First D/A converter module 102, the second D/A converter module 103 and power electronics formula current feedback circuit 104；
FPGA module 101 is separately connected the first D/A converter module 102 and the second D/A converter module 103, the second digital-to-analogue
Conversion module 103 connects power electronics formula current feedback circuit 104；
FPGA module 101 for receives and the direct current amplitude control signal of sampled signal amplitude in proportion relationship and with sampling
The identical a-c cycle of signal frequency controls signal, completes direct current amplitude control signal and the coding of a-c cycle control signal is defeated
Out and transmission timing controls (for controlling the first D/A converter module 102 and the second D/A converter module 103)；
First D/A converter module 102 is used to be generated according to direct current amplitude control signal and close with sampled signal amplitude in proportion
The DC voltage analog signal of system；
Second D/A converter module 103 be used for generate and sampled signal with frequency alternating voltage analog signal；
Power electronics formula current feedback circuit 104 is believed for DC voltage analog signal based on the received and alternating voltage simulation
Number as the control signal of amplitude and frequency export high-frequency current signal.
The current source further includes frequency modulation(PFM) module 105；
Frequency modulation(PFM) module 105 be connected to the second D/A converter module 103 and power electronics formula current feedback circuit 104 it
Between；
The sinusoidal alternating current pressing mold for the same frequency that frequency modulation(PFM) module 105 is used to send the second D/A converter module 103
Quasi- signal is converted to the alternating voltage analog signal of the square wave of corresponding same frequency.
Referring to Fig. 3, the high-frequency current source device of real-time control is separated in dotted line frame for waveform amplitude-frequency, by FPGA module
101, D/A converter module, frequency modulation(PFM) module 105, power electronics formula current feedback circuit 104 form.FPGA module 101 receives
It is controlled with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and a-c cycle identical with sampling signal frequency
Signal；FPGA module 101 controls D/A converter module according to interactive output signal parameter, generates press crude sampling width respectively
It is worth the direct current small voltage analog signal of scale smaller and with crude sampling with the AC sine small voltage analog signal of frequency；Digital-to-analogue turns
Mold changing block is responsible for the digital quantity signal that FPGA module 101 exports being converted to analog signals；Frequency modulation(PFM) module 105 is responsible for will
Corresponding square wave small voltage analog quantity is converted to frequency AC sine small voltage analog quantity；Power electronics formula current feedback circuit 104
DC analogue quantity and square wave Analog control signal are received, final high frequency high current signal is exported.
FPGA module 101 receives the direct current amplitude control signal and and sampled signal with sampled signal amplitude in proportion relationship
After frequency identical a-c cycle control signal, under the control of high precision clock module, complete direct current amplitude control signal with
A-c cycle controls the coding output and transmission timing control of signal, and driving D/A converter module exports corresponding small voltage simulation
Measure signal.
101 processor of FPGA module uses the Spartan3 series of products XC3S1500 of Xilinx, and including 1,500,000 is
System door, 32 special multipliers, 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 102 and the second D/A converter module 103, for receiving FPGA
The digital drive signals of module 101 are converted to corresponding small voltage analog signals, realize digital control loop and simulation output
The control signal interaction interface in circuit.
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 102 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:
In step 1 FPGA module 101 receive with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and
A-c cycle identical with sampling signal frequency controls signal, in step 2, by small voltage respectively to the amplitude of current source
It is controlled with frequency.Finally by step 3, output and the consistent high frequency high current signal of crude sampling file data.
Step 1:
FPGA module 101 receives the direct current amplitude control signal and and sampled signal with sampled signal amplitude in proportion relationship
The identical a-c cycle of frequency controls signal.
Step 2: frequency width separation control
FPGA module 101 in step 1 receives the direct current amplitude control signal with sampled signal amplitude in proportion relationship,
That is amplitude signal generates the identical small voltage DC analogue quantity signal of amplitude by digital-to-analogue conversion, can control back end current source defeated
The amplitude of signal out.
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；
FPGA module 101 also has received a-c cycle control signal identical with sampling signal frequency in step 1, passes through
Digital-to-analogue conversion generates the identical small voltage ac analog signal (sinusoidal signal) of frequency, by frequency modulation process, reconvert
For the small voltage square wave analog signals of same frequency, the frequency of back end current source output signal can control.
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 3: high-frequency current output
Direct current small voltage signal and square wave small voltage signal that step 2 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 3, FPGA module 101 receives the direct current amplitude with sampled signal amplitude in proportion relationship
It controls signal and a-c cycle identical with sampling signal frequency controls signal, be separately converted to associated small voltage control letter
Number, the output of synchronous driving power electronic current generator realizes the automatic real-time control in digital current source.
Referring to Fig. 5, frequency modulation(PFM) module 105 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 105 include: operational amplifier, resistance R11, resistance R12, resistance R13, resistance R14,
Capacitor CA10, capacitor CA11, capacitor CA12, diode；
The second end of the input terminal of the first end rate of connections modulation module 105 of resistance R11, resistance R11 connects resistance R12
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 105；
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
105 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 105 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 105 of operational amplifier, the 7th end connection+12V's of operational amplifier
Power supply.
By frequency modulation(PFM) module 105, the High-frequency Interference amount in original sampled signal is filtered out, extracted valid data information,
The square-wave frequency modulation voltage signal with initial sinusoids sampling with frequency is generated, 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 104 is specifically used for obtaining the direct current small voltage signal amplitude of input, adjusts in proportion
The amplitude of itself whole output high current signal；Square wave small voltage signal is obtained, control internal power electronic device is cut-off, and is changed
The frequency of output 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.
First D/A converter module 102 is DAC modulus conversion chip.
Second D/A converter module 103 is DAC modulus conversion chip.
FPGA module 101 includes system gate circuit, special multiplier and digital dock management module.
Diode is specially Transient Suppression Diode, i.e. TVS (Transient Voltage Suppressor) diode.
The application has following technical characterstic:
(1) by the digital-to-analogue conversion process of 101 driving control signal of FPGA module, have good timing control and concurrently locate
Reason ability ensure that the synchronism of amplitude control signal and frequency control signal, it can be achieved that the accurate of current source output characteristics
It adjusts；
(2) 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, above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, those skilled in the art should understand that: it is still
It is possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equally replaced
It changes；And these are modified or replaceed, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. a kind of source of high frequency current characterized by comprising FPGA module, the first D/A converter module, the second digital-to-analogue conversion mould
Block and power electronics formula current feedback circuit；
The FPGA module is separately connected first D/A converter module and second D/A converter module, second number
Mould conversion module connects the power electronics formula current feedback circuit；
The FPGA module is believed for receiving with the direct current amplitude control signal of sampled signal amplitude in proportion relationship and with sampling
The identical a-c cycle of number frequency controls signal, and the coding for completing direct current amplitude control signal and a-c cycle control signal exports
And transmission timing 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 according to claim 1, which is characterized in that further 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 according to claim 1, which is characterized in that first D/A converter module uses two
Complement on n n coding, 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.
4. a kind of source of high frequency current according to claim 2, which is characterized in that the frequency modulation(PFM) module includes low pass filtered
Wave 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.
5. a kind of source of high frequency current according to claim 4, which is characterized in that the circuit packet of the frequency modulation(PFM) module
It includes: operational amplifier, resistance R11, resistance R12, resistance R13, resistance R14, capacitor CA10, capacitor CA11, capacitor CA12, two poles
Pipe；
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.
6. a kind of source of high frequency current 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.
7. a kind of source of high frequency current according to claim 1, which is characterized in that first D/A converter module is DAC
Modulus conversion chip.
8. a kind of source of high frequency current according to claim 1, which is characterized in that second D/A converter module is DAC
Modulus conversion chip.
9. a kind of source of high frequency current according to claim 1, which is characterized in that the FPGA module includes system door electricity
Road, special multiplier and digital dock management module.
10. a kind of source of high frequency current according to claim 5, which is characterized in that the diode is specially that transient state inhibits
Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920012440.7U CN209296902U (en) | 2019-01-04 | 2019-01-04 | A kind of source of high frequency current |
Applications Claiming Priority (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610482A (en) * | 2020-06-10 | 2020-09-01 | 国网四川省电力公司电力科学研究院 | Converter station direct-current voltage transformer broadband transfer characteristic test system and method |
| CN112737394A (en) * | 2020-12-30 | 2021-04-30 | 四川红华实业有限公司 | Control method for special power supply device |
| CN113009197A (en) * | 2021-02-08 | 2021-06-22 | 中山职业技术学院 | Amplitude-frequency adjustable power source |
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2019
- 2019-01-04 CN CN201920012440.7U patent/CN209296902U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610482A (en) * | 2020-06-10 | 2020-09-01 | 国网四川省电力公司电力科学研究院 | Converter station direct-current voltage transformer broadband transfer characteristic test system and method |
| CN111610482B (en) * | 2020-06-10 | 2022-09-13 | 国网四川省电力公司电力科学研究院 | Converter station direct-current voltage transformer broadband transfer characteristic test system and method |
| CN112737394A (en) * | 2020-12-30 | 2021-04-30 | 四川红华实业有限公司 | Control method for special power supply device |
| CN113009197A (en) * | 2021-02-08 | 2021-06-22 | 中山职业技术学院 | Amplitude-frequency adjustable power source |
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