Standard power source based on pulse driving alternating current quantum voltage self-calibration and self-calibration method of standard power source

Abstract

The invention discloses a standard power source based on pulse driving alternating current quantum voltage self-calibration and a self-calibration method of the standard power source. The standard power source comprises a JAWS quantum alternating current voltage module, an ADC module and a DSP module. The ADC module is used for collecting a first measurement signal and a second measurement signal; the DSP module is used for sending a quantum voltage acquisition signal to the ADC module when determining that the error between the first measurement signal and the second measurement signal is within a preset range; otherwise, taking the current voltage waveform and the current waveform as a final voltage waveform and a final current waveform; the ADC module is used for collecting a current quantum voltage signal; and the DSP module is also used for correcting the current voltage waveform and the current current waveform according to the current quantum voltage signal. Through the implementation of the invention, the standard power source can have long-term high accuracy and high stability during calibration.

Description

Technical Field

[0001] The present invention relates to the technical field of digital data processing, and in particular to a standard power source based on pulse-driven AC quantum voltage self-calibration, and a self-calibration method for the standard power source. Background Art

[0002] A standard power source is a high-precision electronic measuring instrument used for calibrating power quality measurement devices. It can provide standard voltage and current signals, and independently adjust the amplitudes of the voltage and current and the phase difference between the two, so it is widely used in the power quality calibration, detection, and evaluation of power systems.

[0003] However, in the design process of the standard power source, there are design processes with extremely high technological levels, such as analog circuit design, DAC design, and long-term stability design, which result in the long-term stability of the power source being limited by the long-term stability of the ADC sampling channels in the analog circuit. Summary of the Invention

[0004] The present invention provides a standard power source based on pulse-driven AC quantum voltage self-calibration, and a self-calibration method for the standard power source, which can have long-term high accuracy and high stability during calibration.

[0005] An embodiment of the present invention provides a standard power source based on pulse-driven AC quantum voltage self-calibration, including:

[0006] A JAWS quantum AC voltage module, an ADC module, and a DSP module; the DSP module is connected to the ADC module, and the JAWS quantum AC voltage module is connected to the ADC module through a switch;

[0007] The ADC module is used to collect a first measurement signal of the current voltage waveform and a second measurement signal of the current current waveform in real time; wherein, the current voltage waveform and the current current waveform at the initial time are generated by the DSP module according to preset target electrical parameter values;

[0008] The DSP module is used to send a quantum voltage acquisition signal to the ADC module when it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than a preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than a preset current threshold; otherwise, the current voltage waveform and the current current waveform are used as the final voltage waveform and current waveform;

[0009] The ADC module is used to collect the current quantum voltage signal generated by the JAWS quantum AC voltage module and transmit it to the DSP module every time a quantum voltage acquisition signal is received;

[0010] The above DSP module is also used to calculate the current electrical correction coefficient according to the current quantum voltage signal; and correct the current voltage waveform and the current current waveform according to the current electrical correction coefficient and the above preset target electrical parameter value to obtain the updated current voltage waveform and the updated current current waveform.

[0011] Furthermore, it further includes:

[0012] A human-machine interface; the above human-machine interface is connected to the above DSP module;

[0013] The above human-machine interface is used to obtain the preset target electrical parameter value input by the user and input the above preset target electrical parameter value into the above DSP module, so that the above DSP module generates the above preset target voltage waveform and the above preset target current waveform according to the above preset target electrical parameter value.

[0014] Furthermore, it further includes:

[0015] A first DAC conversion module, a second DAC conversion module, a voltage power amplifier module, a transconductance power amplifier module, a precision voltage transformer, and a precision current transducer;

[0016] The above first DAC conversion module is connected to the above DSP module, the above second DAC conversion module is connected to the above DSP module, the above voltage power amplifier module is connected to the above first DAC conversion module, the above transconductance power amplifier module is connected to the above second DAC conversion module, the above precision voltage transformer is connected to the above voltage power amplifier module, and the above precision current transducer is connected to the above transconductance power amplifier module;

[0017] The above first DAC conversion module is used to convert the updated current voltage waveform from a digital signal into an analog signal to obtain the updated current analog voltage waveform and input the current analog voltage waveform into the above voltage power amplifier module;

[0018] The above voltage power amplifier module is used to amplify the current analog voltage waveform and input it into the above precision voltage transformer, so that the above precision voltage transformer generates a first measurement signal according to the amplified current analog voltage waveform for the above ADC module to collect;

[0019] The above second DAC conversion module is used to convert the updated current current waveform from a digital signal into an analog signal to obtain the updated current analog current waveform and input the current analog current waveform into the above transconductance power amplifier module;

[0020] The above transconductance power amplifier module is used to amplify the current analog current waveform and then input it into the above precision current converter, so that the above precision current converter generates a second measurement signal according to the amplified current analog current for the above ADC module to collect.

[0021] Further, it further includes:

[0022] A reference voltage module;

[0023] After the above first DAC conversion module, the above second DAC conversion module, and the above ADC module are connected, they are jointly connected to the above reference voltage module;

[0024] The above reference voltage module is used to provide a reference voltage for the above first DAC conversion module, the above second DAC conversion module, and the above ADC module.

[0025] Further, it further includes:

[0026] A first switch and a second switch;

[0027] The first end of the above first switch is connected to the first port of the above ADC module for collecting the above first measurement signal, the second end of the above first switch is connected to the above JAWS quantum AC voltage module, the third end of the above first switch is connected to the above precision voltage transformer, the first end of the above second switch is connected to the second port of the above ADC module for collecting the above second measurement signal, the second end of the above second switch is connected to the above JAWS quantum AC voltage module, and the third end of the above second switch is connected to the above precision current converter;

[0028] When the second end of the above first switch is closed and the second end of the above second switch is closed, the above ADC module synchronously collects the current quantum voltage signal generated by the JAWS quantum AC voltage module through the above first port and the above second port;

[0029] When the third end of the above first switch is closed and the third end of the above second switch is closed, the above ADC module synchronously collects the first measurement signal of the current voltage waveform and the second measurement signal of the current current waveform through the above first port and the above second port.

[0030] Further, the above DSP module is further used for:

[0031] When each current electrical correction coefficient is calculated, the current electrical correction coefficient is stored, so that when the above ADC module cannot collect the current quantum voltage signal, the latest stored electrical correction coefficient is used as the current electrical correction coefficient.

[0032] Further, the generation of the above-mentioned preset target voltage waveform and the above-mentioned preset target current waveform includes:

[0033] Generating the above-mentioned preset target voltage waveform and the above-mentioned preset target current waveform according to the preset voltage amplitude, preset current amplitude and preset power factor angle in the above-mentioned preset target electrical parameter values.

[0034] Further, the calculation of the current electrical correction coefficient according to the current quantum voltage signal includes:

[0035] Performing a fast Fourier transform on the current quantum voltage signal to obtain the first fundamental wave amplitude of the first fundamental wave, the second fundamental wave amplitude of the second fundamental wave, the first fundamental wave phase of the first fundamental wave, and the second fundamental wave phase of the second fundamental wave in the quantum voltage signal; wherein, the above-mentioned first fundamental wave is the fundamental wave after performing a fast Fourier transform on the current quantum voltage signal collected at the above-mentioned first port, and the above-mentioned second fundamental wave is the fundamental wave after performing a fast Fourier transform on the current quantum voltage signal collected at the above-mentioned second port;

[0036] Obtaining the signal amplitude of the current quantum voltage signal, calculating the quotient of the above-mentioned signal amplitude and the above-mentioned first fundamental wave amplitude to obtain the first amplitude correction coefficient of the above-mentioned first port, and calculating the quotient of the above-mentioned signal amplitude and the above-mentioned second fundamental wave amplitude to obtain the second amplitude correction coefficient of the above-mentioned second port;

[0037] Calculating the difference between the above-mentioned first fundamental wave phase and the above-mentioned second fundamental wave phase to obtain the second phase correction coefficient of the second port;

[0038] Obtaining the current electrical correction coefficient according to the above-mentioned first amplitude correction coefficient, second amplitude correction coefficient and the above-mentioned second phase correction coefficient.

[0039] Further, the correction of the current voltage waveform and the current current waveform according to the current electrical correction coefficient and the preset target electrical parameter values to obtain the updated current voltage waveform and current current waveform includes:

[0040] Performing a fast Fourier transform on the current voltage waveform and the current waveform to obtain the voltage amplitude, voltage phase, current amplitude and current phase;

[0041] Calculating the difference between the above-mentioned voltage phase and the current phase to obtain the current power factor angle;

[0042] Calculating the product of the above-mentioned voltage amplitude and the above-mentioned first amplitude correction coefficient to obtain the corrected voltage amplitude;

[0043] Calculating the product of the above-mentioned current amplitude and the above-mentioned second amplitude correction coefficient to obtain the corrected current amplitude;

[0044] Calculate the sum of the current power factor angle and the above-mentioned second phase correction coefficient to obtain the corrected power factor angle;

[0045] Calculate and generate an updated current voltage waveform based on the above-mentioned preset voltage amplitude, corrected voltage amplitude, and the current voltage waveform;

[0046] Calculate and generate an updated current current waveform based on the above-mentioned preset current amplitude, preset power factor angle, corrected current amplitude, the current current waveform, and the corrected power factor angle.

[0047] Based on the above device item embodiments, the present invention correspondingly provides a self-calibration method for a standard power source, applicable to a standard power source for pulsed-driven AC quantum voltage self-calibration as described in any one of the above, including:

[0048] Collect a first measurement signal of the current voltage waveform and a second measurement signal of the current current waveform in real time; wherein, the initial current voltage waveform and current current waveform are generated by the DSP module according to preset electrical parameter values;

[0049] When it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than the preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than the preset current threshold, send a quantum voltage acquisition signal to the ADC module, so that the ADC module collects the current quantum voltage signal generated by the JAWS quantum AC voltage module each time it receives a quantum voltage acquisition signal; calculate the current electrical correction coefficient according to the current quantum voltage signal; correct the current voltage waveform and current current waveform according to the current electrical correction coefficient and the preset target electrical parameter values to obtain updated current voltage waveform and current current waveform;

[0050] Otherwise, use the current voltage waveform and current current waveform as the final voltage waveform and current waveform.

[0051] The embodiments of the present invention have the following beneficial effects:

[0052] The present invention provides a standard power source based on pulse-driven AC quantum voltage self-calibration and a self-calibration method for the standard power source. The standard power source includes: a JAWS quantum AC voltage module, an ADC module, and a DSP module; the DSP module is connected to the ADC module, and the JAWS quantum AC voltage module is connected to the ADC module through a switch; the ADC module is configured to collect a first measurement signal of the current voltage waveform and a second measurement signal of the current current waveform in real time; wherein, the current voltage waveform and the current current waveform at the initial time are generated by the DSP module according to a preset target electrical parameter value; the DSP module is configured to send a quantum voltage acquisition signal to the ADC module when it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than a preset voltage threshold and the difference between the second measurement signal and the preset target current waveform is greater than a preset current threshold; otherwise, the current voltage waveform and the current current waveform are used as the final voltage waveform and current waveform; the ADC module is configured to collect the current quantum voltage signal generated by the JAWS quantum AC voltage module and transmit it to the DSP module every time a quantum voltage acquisition signal is received; the DSP module is further configured to calculate the current electrical correction coefficient according to the current quantum voltage signal; and correct the current voltage waveform and the current current waveform according to the current electrical correction coefficient and the preset target electrical parameter value to obtain an updated current voltage waveform and current current waveform. Therefore, the quantum voltage signal generated by the JAWS quantum AC voltage module in the present invention has the advantage of being directly traceable to natural constants, that is, it does not need to be calibrated or referenced depending on external environmental conditions (such as temperature, pressure, etc.) like traditional signal sources. Therefore, using the quantum voltage signal generated by the JAWS quantum AC voltage module to calculate the correction coefficient of the data collected by the ADC module can make the calculated correction coefficient extremely accurate. Subsequently, using this correction coefficient as a correction standard to calibrate the output of the standard power source until the voltage output waveform meets the requirements, so that this standard power source has long-term high accuracy and high stability during calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 FIG. is a structural diagram of a standard power source based on pulse-driven AC quantum voltage self-calibration provided by an embodiment of the present invention.

[0054] Figure 2 FIG. is a structural diagram of the ADC module provided by an embodiment of the present invention.

[0055] Figure 3 FIG. is a structural diagram of the DAC conversion module provided by an embodiment of the present invention.

[0056] Figure 4 FIG. is a structural diagram of the voltage power amplifier module provided by an embodiment of the present invention.

[0057] Figure 5 It is the structural diagram of a transconductance power amplifier module provided by an embodiment of the present invention.

[0058] Figure 6 It is the structural diagram of a precision current converter provided by an embodiment of the present invention.

[0059] Figure 7 It is the flowchart of a self - calibration method for a standard power source provided by an embodiment of the present invention. Detailed implementation manners

[0060] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] As Figure 1 shown, a standard power source based on pulse - driven AC quantum voltage self - calibration provided by an embodiment of the present invention includes:

[0062] A JAWS quantum AC voltage module, an ADC module, and a DSP module; the above - mentioned DSP module is connected to the above - mentioned ADC module, and the above - mentioned JAWS quantum AC voltage module is connected to the above - mentioned ADC module through a switch;

[0063] Specifically, the above - mentioned JAWS quantum voltage generator is composed of a Josephson junction array chip, microwave, cryogenic refrigerator, high - temperature crystal, pulse code generator, low - pass filter, etc., and is used to generate a power frequency signal source based on the Josephson quantum effect. Since the voltage value output by it is only related to basic physical constants, it has extremely high stability and accuracy. The amplitude of the quantum voltage signal output by the JAWS quantum voltage generator can be traced back to natural constants, and its waveform has the advantages of ultra - low noise and ultra - low distortion, and the uncertainty at 50 Hz is better than 5 ppm.

[0064] Specifically, the above - mentioned DSP module is composed of a BF609 chip and its peripherals. The chip is built - in with a large number of peripherals, including 3 SPI interfaces, 3 SPORT interfaces, 16 general - purpose IO ports, an AMC interface (asynchronous storage interface), 256 MBYTE DRAM, etc.

[0065] Specifically, the above ADC module consists of a front-end driver and an AD4630-24 chip. The AD4630-24 chip has extremely low noise performance, and its linearity specification of ±0.1 ppm typical value (±0.9 ppm maximum value) is far better than that of other ADC modules. The AD4630-24 has low noise, high linearity, low zero-point and gain drift specifications, and is a dual-channel, synchronous sampling, 2MSPS SAR ADC. The front-end driver is a differential input and differential output driver circuit composed of 4 resistors, an operational amplifier OPA1632, and a reference voltage ADR441B. The resistors are metal film resistors with a temperature drift of 1 ppm from VISHAY, and the resistance values are all 1 kΩ, with a tolerance of ±0.001% within the custom resistor tolerance range. OPA1632 is a differential operational amplifier with ultra-low distortion of 0.000022%. The reference voltage uses the voltage value of 2.5V output by ADR441B. The purpose of the front-end driver circuit is to increase the drive current and provide a common-mode voltage of 2.5V at the same time. Schematically, the structure diagram of the above ADC module is as Figure 2 shown, Figure 2 In part a of the figure, it is a schematic structural diagram of the front-end driver in the ADC module, Figure 2 and in part b of the figure, it is a schematic overall structural diagram of the ADC module.

[0066] The above ADC module is used to collect the first measurement signal of the current voltage waveform and the second measurement signal of the current current waveform in real time; among them, the current voltage waveform and the current current waveform at the initial time are generated by the DSP module according to the preset target electrical parameter values;

[0067] Specifically, the current voltage waveform and the current current waveform at the initial time are the preset target voltage waveform and the preset target current waveform generated according to the preset target electrical parameter values.

[0068] The above DSP module is used to send a quantum voltage acquisition signal to the above ADC module when it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than the preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than the preset current threshold; otherwise, the current voltage waveform and the current current waveform are used as the final voltage waveform and current waveform;

[0069] In a preferred embodiment, the generation of the above preset target voltage waveform and the above preset target current waveform includes:

[0070] Generating the above preset target voltage waveform and the above preset target current waveform according to the preset voltage amplitude, the preset current amplitude, and the preset power factor angle in the above preset target electrical parameter values.

[0071] Specifically, after the DSP module generates the preset target voltage waveform and the preset target current waveform, it stores the waveform data of 18,000 points per cycle, stores the waveform data, and then can output a pure sine wave after enabling the built-in DMA.

[0072] In this preferred embodiment, the preset target voltage waveform and the above-mentioned preset target current waveform are generated by the preset voltage amplitude, the preset current amplitude, and the preset power factor angle in the preset target electrical parameter values.

[0073] The above ADC module is used to collect the current quantum voltage signal generated by the JAWS quantum AC voltage module and transmit it to the above DSP module every time a quantum voltage acquisition signal is received;

[0074] Preferably, since the accuracy of the standard power source itself can only reach 0.01 level. Therefore, it is necessary to use the JAWS quantum AC voltage module as a reference and adopt a synchronous sampling dual-channel ADC module as a transitional reference for calibration to make the accuracy approach the accuracy of the reference JAWS, so as to achieve the purpose of power tracing to voltage and voltage tracing to the quantum natural reference constant.

[0075] The above DSP module is also used to calculate the current electrical correction coefficient according to the current quantum voltage signal; according to the current electrical correction coefficient and the above-mentioned preset target electrical parameter values, correct the current voltage waveform and the current current waveform to obtain the updated current voltage waveform and the current current waveform.

[0076] In a preferred embodiment, the calculating the current electrical correction coefficient according to the current quantum voltage signal includes:

[0077] Performing a fast Fourier transform on the current quantum voltage signal to obtain the first fundamental wave amplitude of the first fundamental wave, the second fundamental wave amplitude of the second fundamental wave, the first fundamental wave phase of the first fundamental wave, and the second fundamental wave phase of the second fundamental wave in the quantum voltage signal; wherein, the above first fundamental wave is the fundamental wave after performing a fast Fourier transform on the current quantum voltage signal collected at the above first port, and the above second fundamental wave is the fundamental wave after performing a fast Fourier transform on the current quantum voltage signal collected at the above second port;

[0078] Specifically, let the quantum voltage signals of one cycle sampled by the above ADC module be CH0_JAWS (corresponding to the quantum voltage signal collected at the first port) and CH1_JAWS (corresponding to the quantum voltage signal collected at the second port), and the sampling rate is set to 51.2 kSPS, that is, 1024 points per cycle.

[0079] Then the FFT (fast Fourier transform) conversion result corresponding to the first port is:

[0080] DFT_JAWS_CH0 = DFT(CH0_JAWS, 1024)

[0081] Wherein, DFT_JAWS_CH0 represents the waveform array after the conversion of the quantum voltage signal of the first port, and there are 512 elements including DC and harmonics in this array.

[0082] The FFT conversion result corresponding to the second port is:

[0083] DFT_JAWS_CH1 = DFT(CH1_JAWS, 1024)

[0084] Wherein, DFT_JAWS_CH1 represents the waveform array after the conversion of the quantum voltage signal of the second port, and there are 512 elements including DC and harmonics in this array.

[0085] Specifically, the above-mentioned first fundamental wave amplitude JAWS_CH0_A is calculated by the following formula:

[0086] JAWS_CH0_A = abs(DFT_JAWS_CH0[1])

[0087] Wherein, DFT_JAWS_CH0[1] represents the fundamental wave vector after the FFT conversion of the quantum voltage signal of the first port, and abs represents the amplitude operation.

[0088] Specifically, the above-mentioned second fundamental wave amplitude JAWS_CH1_A is calculated by the following formula:

[0089] JAWS_CH1_A = abs(DFT_JAWS_CH1[1])

[0090] Wherein, DFT_JAWS_CH1[1] represents the fundamental wave vector after the FFT conversion of the quantum voltage signal of the second port.

[0091] Specifically, the above-mentioned first fundamental wave phase JAWS_CH0_φ is calculated by the following formula:

[0092] JAWS_CH0_φ = atan2(DFT_JAWS_CH0[1].im, DFT_JAWS_CH0[1].re) × 180 / π

[0093] Wherein, atan2 represents the function for calculating the polar coordinate angle, DFT_JAWS_CH0[1].im represents the imaginary part value of the fundamental wave vector after the FFT conversion of the quantum voltage signal of the first port, and DFT_JAWS_CH0[1].re represents the real part value of the fundamental wave vector after the FFT conversion of the quantum voltage signal of the first port.

[0094] Specifically, the above-mentioned second fundamental wave phase JAWS_CH1_φ is calculated by the following formula:

[0095] JAWS_CH1_φ = atan2(DFT_JAWS_CH1[1].im / DFT_JAWS_CH1[1].re) × 180 / π

[0096] Specifically, the units of the first fundamental wave phase and the second fundamental wave phase are degrees.

[0097] Preferably, since the waveform of the quantum voltage signal is close to the ideal value, only the fundamental wave signal is taken.

[0098] Obtain the signal amplitude of the current quantum voltage signal, calculate the quotient of the above-mentioned signal amplitude and the above-mentioned first fundamental wave amplitude to obtain the first amplitude correction coefficient of the above-mentioned first port, and calculate the quotient of the above-mentioned signal amplitude and the above-mentioned second fundamental wave amplitude to obtain the second amplitude correction coefficient of the above-mentioned second port;

[0099] Specifically, the signal amplitude of the quantum voltage signal is a known quantity, and this value can be considered as the true value (i.e., traceable to natural constants). Let the signal amplitude be AJ, and the first amplitude correction coefficient CH0_AJ is calculated by the following formula:

[0100] CH0_AJ = AJ / JAWS_CHO_A

[0101] Specifically, the second amplitude correction coefficient CH1_AJ is calculated by the following formula:

[0102] CH1_AJ = AJ / JAWS_CH1_A

[0103] Calculate the difference between the above-mentioned first fundamental wave phase and the above-mentioned second fundamental wave phase to obtain the second phase correction coefficient of the second port;

[0104] Specifically, since the power factor angle of the voltage and current is known, that is, the above-mentioned preset power factor angle, there is no need to correct the phase of the first port. The second phase correction coefficient CH1_φJ is calculated by the following formula:

[0105] CH1_φJ = JAWS_CH0_φ - JAWS_CH1_φ

[0106] Obtain the current electrical correction coefficient according to the above-mentioned first amplitude correction coefficient, second amplitude correction coefficient, and the above-mentioned second phase correction coefficient.

[0107] In this preferred embodiment, the electrical correction coefficient is calculated by performing a fast Fourier transform on the quantum voltage signal.

[0108] In another preferred embodiment, correcting the current voltage waveform and the current current waveform according to the current electrical correction coefficient and the preset target electrical parameter value to obtain the updated current voltage waveform and the current current waveform includes:

[0109] Performing a fast Fourier transform on the current voltage waveform and the current waveform to obtain a voltage amplitude, a voltage phase, a current amplitude, and a current phase;

[0110] Specifically, after performing a fast Fourier transform on the voltage waveform, extracting the amplitude and phase corresponding to the fundamental wave to obtain the voltage amplitude and the voltage phase, and after performing a fast Fourier transform on the current waveform, extracting the amplitude and phase corresponding to the fundamental wave to obtain the current amplitude and the current phase.

[0111] Calculating the difference between the above voltage phase and the current phase to obtain the current power factor angle;

[0112] Specifically, the power factor angle CH_φ is calculated according to the following formula:

[0113] CH_φ = V_CH0_φ - I_CH1_φ

[0114] In the formula, V_CH0_φ represents the voltage phase, and I_CH1_φ represents the current phase.

[0115] Calculating the product of the above voltage amplitude and the first amplitude correction coefficient to obtain the corrected voltage amplitude;

[0116] Specifically, the corrected voltage amplitude V_CH0_A_J is calculated according to the following formula:

[0117] V_CH0_A_J = V_CH0_A × CH0_AJ

[0118] Calculating the product of the above current amplitude and the second amplitude correction coefficient to obtain the corrected current amplitude;

[0119] Specifically, the corrected current amplitude I_CH1_A_J is calculated through the following formula:

[0120] I_CH1_A_J = I_CH1_A × CH1_AJ

[0121] Calculating the sum of the current power factor angle and the second phase correction coefficient to obtain the corrected power factor angle;

[0122] Specifically, the corrected power factor angle CH_φ_J is calculated according to the following formula:

[0123] CH_φ_J = CH_φ + CH1_φJ

[0124] Calculate and generate an updated current voltage waveform based on the above-mentioned preset voltage amplitude, corrected voltage amplitude, and the current voltage waveform;

[0125] Calculate and generate an updated current current waveform based on the above-mentioned preset current amplitude, preset power factor angle, corrected current amplitude, the current current waveform, and the corrected power factor angle.

[0126] Specifically, let the preset voltage amplitude be V set , the preset current amplitude be I set , and the preset power factor angle be φ set . Then, the amplitude adjustment ratio V sj corresponding to the first DAC conversion module can be calculated according to the following formula:

[0127]

[0128] At the same time, the amplitude adjustment ratio I sj corresponding to the second DAC conversion module is calculated according to the following formula:

[0129]

[0130] At the same time, the phase adjustment ratio φ sj corresponding to the second DAC conversion model is calculated according to the following formula:

[0131] φ sj = φ set - CH_φ_J

[0132] Specifically, calculate the product of the current voltage waveform and the amplitude adjustment ratio V sj to obtain the amplitude of the updated current voltage waveform. Calculate the product of the current voltage waveform and the amplitude adjustment ratio I sj to obtain the amplitude of the updated current voltage waveform. Subsequently, based on the amplitude of the updated current voltage waveform, the amplitude of the updated current voltage waveform, and the phase adjustment ratio φ sj corresponding to the second DAC conversion model, generate an updated current current waveform and an updated current voltage waveform.

[0133] Specifically, after the waveform is generated, the updated current voltage waveform and current current waveform are written in another replicated area within the above DSP module. When the waveform is completely written, the built-in ChainDMA of the DSP module is enabled (the above DSP module has the function of chained DMA, which is an efficient direct memory access (DMA) technology), and the output is switched to the compensated waveform buffer. ChainDMA (can seamlessly switch between multiple or two buffers. When ChainDMA is enabled, the DSP module will wait until the previous area is executed and then seamlessly switch to execute the new area). The ChainDMA adopted can ensure that there is no jitter or waveform discontinuity during the waveform generation and output process.

[0134] In this preferred embodiment, according to the current electrical correction coefficient and the preset target electrical parameter value, the current voltage waveform and current current waveform are corrected to obtain the updated current voltage waveform and current current waveform.

[0135] In another preferred embodiment, it further includes:

[0136] A human-machine interface; the above human-machine interface is connected to the above DSP module;

[0137] The above human-machine interface is used to obtain the preset target electrical parameter value input by the user and input the above preset target electrical parameter value into the above DSP module, so that the above DSP module generates the above preset target voltage waveform and the above preset target current waveform according to the above preset target electrical parameter value.

[0138] Specifically, the above human-machine interface is composed of a display LCD and a keyboard. The display LCD is driven by the BF609 chip and its peripherals through the AMC interface for display. The keyboard contains 16 general-purpose IO ports to implement 16 buttons.

[0139] In this preferred embodiment, through the connection between the human-machine interface and the DSP module, the user input data obtained by the human-machine interface can be transmitted into the DSP module, so that the DSP module generates the above preset target voltage waveform and the above preset target current waveform.

[0140] In another preferred embodiment, it further includes:

[0141] A first DAC conversion module, a second DAC conversion module, a voltage power amplifier module, a transconductance power amplifier module, a precision voltage transformer, and a precision current transducer;

[0142] Specifically, the first DAC conversion module and the second DAC conversion module use a high-precision 20-bit digital-to-analog converter of model AD5791, which is a single-channel 20-bit voltage-output digital-to-analog converter. The bipolar operating voltage is up to 33V, the positive reference voltage ranges from 5V to VDD - 2.5V, the negative reference voltage ranges from VSS + 2.5V to 0V, the accuracy reaches 1ppm, the noise spectral density is 7.5nV / √Hz, the temperature drift is 0.05ppm / °C, and the relative accuracy is ±1 LSB. Within the entire output range, the maximum deviation between the analog output increment corresponding to any two adjacent digital codes and the ideal 1LSB analog increment does not exceed 1LSB. At the same time, it has a low-frequency noise of 0.025ppm and an output drift of 0.05ppm / °C, and can be configured as a standard unipolar (+5V, +10V) or bipolar (±5V, ±10V) voltage, and is configured as a ±5V voltage output in the present invention. Schematically, the structural diagram of the DAC conversion module is as shown in Figure 3 shown.

[0143] Specifically, the power supply range of the voltage power amplifier module is ±50V to 450V, the output current reaches 100mA, and the amplification factor in the present invention is 220 times (that is, when there is an input voltage of 1V, the voltage output is 220V). The resistors use voltage-dividing resistors of 1kΩ and 219kΩ, the temperature drift is 0.1ppm, and the noise is 2μV RMS. Schematically, the structural diagram of the above voltage power amplifier module is as shown in Figure 4 shown.

[0144] Specifically, the above transconductance power amplifier module is composed of a precision power amplifier and a resistor. When an input voltage of 1V is applied, it can output a current with a voltage of 5V. The precision power amplifier has an output current capacity of 2A, has a parallel interface, supports parallel output, the noise is 8μV, the resistor noise is 0.010μVRMS / V, the rise time of the resistor is 1ns, the temperature drift is 0.2ppm, and the accuracy is 0.01%. In the present invention, the accuracy of the resistor is 0.01%. Schematically, the structural diagram of the above transconductance power amplifier module is as shown in Figure 5 shown.

[0145] Specifically, the ratio of the above precision voltage transformer is 100V:1V, and the accuracy is 2ppm. The above precision current converter also has a precision resistor. The precision current converter uses an AC zero-flux transformer with 2ppm, the ratio is 5A:10mA, its resistor uses a 100-ohm resistor, and the accuracy is 4ppm. Schematically, the structural diagram of the precision current converter is as shown in Figure 6 shown.

[0146] The above-mentioned first DAC conversion module is connected to the above-mentioned DSP module, the above-mentioned second DAC conversion module is connected to the above-mentioned DSP module, the above-mentioned voltage power amplifier module is connected to the above-mentioned first DAC conversion module, the above-mentioned transconductance power amplifier module is connected to the above-mentioned second DAC conversion module, the above-mentioned precision voltage transformer is connected to the above-mentioned voltage power amplifier module, and the above-mentioned precision current converter is connected to the above-mentioned transconductance power amplifier module;

[0147] The above-mentioned first DAC conversion module is used to convert the updated current voltage waveform from a digital signal into an analog signal to obtain an updated current analog voltage waveform, and input the current analog voltage waveform into the above-mentioned voltage power amplifier module;

[0148] Specifically, since the first DAC conversion module is 20-bit and the single polarity is 19-bit, that is, 2 to the 19th power corresponds to the sampling point of the 5V reference, so the current analog voltage waveform obtained after the 220V output voltage passes through the first DAC conversion module is:

[0149]

[0150] VD = [VD0 VD1, VD2, …, VD N-2 , VD N-1 , N = 18000

[0151] In the formula, VD(i) represents the voltage value of the i-th waveform point on the analog voltage waveform, V represents the effective voltage value corresponding to the analog voltage waveform, and N represents the total number of waveform points collected on the analog voltage waveform.

[0152] The above-mentioned voltage power amplifier module is used to amplify the current analog voltage waveform and then input it into the above-mentioned precision voltage transformer, so that the above-mentioned precision voltage transformer generates a first measurement signal according to the amplified current analog voltage waveform for the above-mentioned ADC module to collect;

[0153] The above-mentioned second DAC conversion module is used to convert the updated current current waveform from a digital signal into an analog signal to obtain an updated current analog current waveform, and input the current analog current waveform into the above-mentioned transconductance power amplifier module;

[0154] Specifically, the current analog current waveform obtained through the second DAC conversion module is:

[0155]

[0156] VI = [VI0 VI1, VI2, …, VI N-2 , VI N-1 , N = 18000

[0157] Wherein, VI(i) represents the current value of the i-th waveform point on the analog current waveform, and S represents the reciprocal of the Siemens resistance.

[0158] Specifically, when it is necessary to simulate the phase of the current waveform and the voltage waveform, it can be directly obtained by waveform algorithm fitting. When performing fitting, calculations are carried out at 21BIT 18000 points, and the resolution can reach 0.000001 degrees. The current analog current waveform at this time is:

[0159]

[0160] Wherein, φ represents the included angle between the analog voltage and the analog current.

[0161] The above-mentioned transconductance power amplifier module is used to amplify the current analog current waveform and input it into the above-mentioned precision current converter, so that the above-mentioned precision current converter generates a second measurement signal according to the amplified current analog current for the above-mentioned ADC module to collect.

[0162] In this preferred embodiment, the updated current voltage waveform and the updated current waveform obtained by the DSP module pass through the first DAC conversion module, the second DAC conversion module, the voltage power amplifier module, the transconductance power amplifier module, the precision voltage transformer, and the precision current converter to obtain the first measurement signal and the second measurement signal that can be collected.

[0163] In another preferred embodiment, it further includes:

[0164] Reference voltage module;

[0165] Specifically, the model of the reference voltage module is the ADR1001E-EBZ module, which has a built-in shunt reference voltage and can be connected to the first DAC conversion module, the second DAC conversion module, and the ADC module. The reference voltage module has a noise of 1.2 μV and a temperature drift of 0.05 ppm / °C, and the output voltage of the reference voltage module is set to 5V.

[0166] After the above-mentioned first DAC conversion module, the second DAC conversion module, and the ADC module are connected, they are jointly connected to the above-mentioned reference voltage module;

[0167] The above-mentioned reference voltage module is used to provide a reference voltage for the above-mentioned first DAC conversion module, the second DAC conversion module, and the ADC module.

[0168] In this preferred embodiment, the reference voltage module provides a reference voltage of 5V for the first DAC conversion module, the second DAC conversion module, and the ADC module.

[0169] In another preferred embodiment, it further includes:

[0170] The first switch and the second switch;

[0171] Specifically, both the first switch and the second switch adopt signal relays with low contact impedance.

[0172] The first end of the first switch is connected to the first port in the ADC module for collecting the first measurement signal, the second end of the first switch is connected to the JAWS quantum AC voltage module, the third end of the first switch is connected to the precision voltage transformer, the first end of the second switch is connected to the second port in the ADC module for collecting the second measurement signal, the second end of the second switch is connected to the JAWS quantum AC voltage module, and the third end of the second switch is connected to the precision current transducer;

[0173] When the second end of the first switch is closed and the second end of the second switch is closed, the ADC module synchronously collects the current quantum voltage signal generated by the JAWS quantum AC voltage module through the first port and the second port;

[0174] When the third end of the first switch is closed and the third end of the second switch is closed, the ADC module synchronously collects the first measurement signal of the current voltage waveform and the second measurement signal of the current current waveform through the first port and the second port.

[0175] In this preferred embodiment, through the opening and closing states of each end of the first switch and the second switch, the ADC module realizes the collection of the current quantum voltage signal, the first measurement signal, and the second measurement signal.

[0176] In another preferred embodiment, the DSP module is further configured to:

[0177] When each current electrical correction coefficient is calculated, store the current electrical correction coefficient so that when the ADC module cannot collect the current quantum voltage signal, the latest stored electrical correction coefficient is used as the current electrical correction coefficient.

[0178] Specifically, if in the current self-calibration process, the JAWS quantum AC voltage module is not used to generate the current quantum voltage signal, that is, when the JAWS quantum AC voltage module is not connected to the second end of the first switch and the second end of the second switch, the electrical correction coefficient calculated from the quantum voltage signal generated by the JAWS quantum AC voltage module for the last time before is used as the current electrical correction coefficient for the subsequent correction and calibration process.

[0179] Specifically, when there is a JAWS quantum AC voltage module, the accuracy of its standard power source is determined by the short-term error of the ADC module during the sampling process, the short-term stability, noise, accuracy of the voltage power amplifier module and the transconductance power amplifier module, as well as the accuracy of the precision voltage transformer and the precision current transducer. Among them, the resistance accuracy of the precision current transducer is 4 ppm, the accuracy of the voltage transformer is 2 ppm, the noise of the voltage power amplifier is 2 μV, the noise of the transconductance power amplifier is 8 μV, the accuracy of the JAWS quantum AC voltage module is 5 ppm, and other quantization errors, wiring impedance and thermoelectric potential are converted to 5 ppm. Therefore, the accuracy of the standard power source when outputting 220 V voltage and 5 A current is: It can meet the design requirements of the standard power source.

[0180] When there is no JAWS quantum AC voltage module, it is necessary to increase the sampling accuracy of the ADC module and the stability of the reference voltage. The stability of the reference voltage within 1000 hours is 4 ppm, and the drift of the ADC module is better than 5 ppm. Therefore, at this time, the accuracy of the standard power source calibrated by the JAWS quantum AC voltage module when outputting 220 V voltage and 5 A current is:

[0181]

[0182] In this way, as long as the JAWS quantum AC voltage module is connected once after leaving the factory, the calibration work can be automatically completed to ensure that the standard power source can meet the index of 50 ppm.

[0183] Based on the above device item embodiments, the present invention correspondingly provides method item embodiments;

[0184] Schematically, as Figure 7 shown, the present invention provides a self-calibration method for a standard power source. The above method is applicable to a standard power source based on pulse-driven AC quantum voltage self-calibration in any of the above embodiments, including:

[0185] Step S101: Real-time collect a first measurement signal of the current voltage waveform and a second measurement signal of the current current waveform; wherein, the current voltage waveform and the current current waveform at the initial time are generated by the DSP module according to preset electrical parameter values;

[0186] Step S102: When it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than the preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than the preset current threshold, a quantum voltage acquisition signal is sent to the ADC module, so that when the ADC module receives a quantum voltage acquisition signal each time, it acquires the current quantum voltage signal generated by the JAWS quantum AC voltage module; according to the current quantum voltage signal, the current electrical correction factor is calculated; according to the current electrical correction factor and the preset target electrical parameter value, the current voltage waveform and the current current waveform are corrected to obtain the updated current voltage waveform and current current waveform;

[0187] Otherwise, the current voltage waveform and the current current waveform are used as the final voltage waveform and current waveform.

[0188] By implementing the above various embodiments of the present invention, the standard power source can have long-term high accuracy and high stability during calibration.

[0189] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A standard power source based on pulse-driven AC quantum voltage self-calibration, characterized in that: include: JAWS quantum AC voltage module, ADC module and DSP module; The DSP module is connected to the ADC module, and the JAWS quantum AC voltage module is connected to the ADC module via a switch; The ADC module is used to collect a first measurement signal of a current voltage waveform and a second measurement signal of a current current waveform in real time; wherein the current voltage waveform and the current current waveform are initially generated by the DSP module according to a preset target electrical parameter value; The DSP module is used to send a quantum voltage acquisition signal to the ADC module when it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than the preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than the preset current threshold; otherwise, the current voltage waveform and the current current waveform are used as the final voltage waveform and current waveform; The ADC module is used to collect the current quantum voltage signal generated by the JAWS quantum AC voltage module and transmit it to the DSP module every time a quantum voltage acquisition signal is received; The DSP module is also used to calculate the current electrical correction coefficient based on the current quantum voltage signal; according to the current electrical correction coefficient and the preset target electrical parameter value, the current voltage waveform and the current current waveform are corrected to obtain updated current voltage waveform and current current waveform.

2. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 1, characterized in that: Also includes: Human-machine interface; The man-machine interface is connected to the DSP module; The human-machine interface is used to obtain the preset target electrical parameter value input by the user, and input the preset target electrical parameter value into the DSP module, so that the DSP module generates the preset target voltage waveform and the preset target current waveform according to the preset target electrical parameter value.

3. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 2, characterized in that: Also includes: A first DAC conversion module, a second DAC conversion module, a voltage power amplifier module, a transconductance power amplifier module, a precision voltage transformer and a precision current converter; The first DAC conversion module is connected to the DSP module, the second DAC conversion module is connected to the DSP module, the voltage power amplifier module is connected to the first DAC conversion module, the transconductance power amplifier module is connected to the second DAC conversion module, the precision voltage transformer is connected to the voltage power amplifier module, and the precision current converter is connected to the transconductance power amplifier module; The first DAC conversion module is used to convert the updated current voltage waveform from a digital signal into an analog signal to obtain an updated current analog voltage waveform, and input the current analog voltage waveform into the voltage power amplifier module; The voltage power amplifier module is used to amplify the current analog voltage waveform and input it into the precision voltage transformer, so that the precision voltage transformer generates a first measurement signal according to the amplified current analog voltage waveform for collection by the ADC module; The second DAC conversion module is used to convert the updated current current waveform from a digital signal to an analog signal to obtain an updated current analog current waveform, and input the current analog current waveform to the transconductance power amplifier module; The transconductance amplifier module is used to amplify the current analog current waveform and input it into the precision current converter, so that the precision current converter generates a second measurement signal according to the amplified current analog current for collection by the ADC module.

4. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 3, characterized in that: Also includes: Reference voltage module; The first DAC conversion module, the second DAC conversion module and the ADC module are connected to the reference voltage module; The reference voltage module is used to provide a reference voltage for the first DAC conversion module, the second DAC conversion module and the ADC module.

5. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 4, characterized in that: Also includes: a first switch and a second switch; The first end of the first switch is connected to a first port in the ADC module for collecting the first measurement signal, the second end of the first switch is connected to the JAWS quantum AC voltage module, the third end of the first switch is connected to the precision voltage transformer, the first end of the second switch is connected to a second port in the ADC module for collecting the second measurement signal, the second end of the second switch is connected to the JAWS quantum AC voltage module, and the third end of the second switch is connected to the precision current converter; When the second end of the first switch is closed and the second end of the second switch is closed, the ADC module synchronously collects the current quantum voltage signal generated by the JAWS quantum AC voltage module through the first port and the second port; When the third end of the first switch is closed and the third end of the second switch is closed, the ADC module synchronously collects a first measurement signal of a current voltage waveform and a second measurement signal of a current current waveform through the first port and the second port.

6. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 5, characterized in that: The DSP module is also used for: Each time a current electrical correction coefficient is calculated, the current electrical correction coefficient is stored, so that when the ADC module cannot collect the current quantum voltage signal, the latest stored electrical correction coefficient is used as the current electrical correction coefficient.

7. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 6, characterized in that: The generation of the preset target voltage waveform and the preset target current waveform includes: The preset target voltage waveform and the preset target current waveform are generated according to the preset voltage amplitude, the preset current amplitude and the preset power factor angle in the preset target electrical parameter value.

8. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 7, characterized in that: The current electrical correction coefficient is calculated based on the current quantum voltage signal, including: Performing a fast Fourier transform on the current quantum voltage signal to obtain a first fundamental wave amplitude of a first fundamental wave, a second fundamental wave amplitude of a second fundamental wave, a first fundamental wave phase of the first fundamental wave, and a second fundamental wave phase of the second fundamental wave in the quantum voltage signal; wherein the first fundamental wave is the fundamental wave after the current quantum voltage signal collected by the first port is subjected to a fast Fourier transform, and the second fundamental wave is the fundamental wave after the current quantum voltage signal collected by the second port is subjected to a fast Fourier transform; Acquire the signal amplitude of the current quantum voltage signal, calculate the quotient of the signal amplitude and the first fundamental wave amplitude, obtain the first amplitude correction coefficient of the first port, calculate the quotient of the signal amplitude and the second fundamental wave amplitude, obtain the second amplitude correction coefficient of the second port; Calculating a difference between the first fundamental wave phase and the second fundamental wave phase to obtain a second phase correction coefficient of the second port; A current electrical correction coefficient is obtained according to the first amplitude correction coefficient, the second amplitude correction coefficient and the second phase correction coefficient.

9. A standard power source based on pulse-driven AC quantum voltage self-calibration according to claim 8, characterized in that: The method of correcting the current voltage waveform and the current current waveform according to the current electrical correction coefficient and the preset target electrical parameter value to obtain the updated current voltage waveform and the current current waveform includes: Performing fast Fourier transform on the current voltage waveform and current waveform to obtain voltage amplitude, voltage phase, current amplitude and current phase; Calculate the difference between the voltage phase and the current phase to obtain the current power factor angle; Calculating the product of the voltage amplitude and the first amplitude correction coefficient to obtain a corrected voltage amplitude; Calculating the product of the current amplitude and the second amplitude correction coefficient to obtain a corrected current amplitude; Calculating the sum of the current power factor angle and the second phase correction coefficient to obtain a corrected power factor angle; Calculating and generating an updated current voltage waveform according to the preset voltage amplitude, the corrected voltage amplitude, and the current voltage waveform; An updated current waveform is calculated and generated according to the preset current amplitude, the preset power factor angle, the corrected current amplitude, the current current waveform, and the corrected power factor angle.

10. A self-calibration method for a standard power source, characterized in that: A standard power source based on pulse-driven AC quantum voltage self-calibration as claimed in any one of claims 1 to 9, characterized in that it comprises: Collecting in real time a first measurement signal of a current voltage waveform and a second measurement signal of a current current waveform; wherein the current voltage waveform and the current current waveform are initially generated by a DSP module according to a preset electrical parameter value; When it is determined that the difference between the first measurement signal and the preset target voltage waveform is greater than the preset voltage threshold, and the difference between the second measurement signal and the preset target current waveform is greater than the preset current threshold, a quantum voltage acquisition signal is sent to the ADC module, so that the ADC module acquires the current quantum voltage signal generated by the JAWS quantum AC voltage module each time a quantum voltage acquisition signal is received; the current electrical correction coefficient is calculated according to the current quantum voltage signal; the current voltage waveform and the current current waveform are corrected according to the current electrical correction coefficient and the preset target electrical parameter value to obtain an updated current voltage waveform and current current waveform; Otherwise, the current voltage waveform and the current current waveform are taken as the final voltage waveform and the current waveform.

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