Power measuring device and method

Abstract

The invention provides a power measuring device and method. A conversion module of the power measuring device is used for converting a voltage to be measured into a first conversion voltage and converting a current to be measured into a second conversion voltage; the standard voltage source is an alternating current quantum voltage source and is used for generating standard quantum voltage of a step waveform; the first analog-to-digital converter / the second analog-to-digital converter is used for obtaining a first voltage difference value / a second voltage difference value based on the standard quantum voltage and the first conversion voltage / the second conversion voltage, and the first voltage difference value / the second voltage difference value is used for compensating the second sampling value / the first sampling value; the processor is used for obtaining to-be-measured power based on the first sampling value and the second sampling value; one of the first analog-to-digital converter and the second analog-to-digital converter is arranged to generate the first voltage difference value or the second voltage difference value, and the first voltage difference value or the second voltage difference value is used for compensating the sampling value of the other one of the first analog-to-digital converter and the second analog-to-digital converter, so that continuous full sampling is realized.

Description

Technical Field

[0001] The present application belongs to the technical field of power measurement, and in particular, relates to a power measurement device and method. Background Art

[0002] Currently, a programmable AC quantum voltage source, the Programmable Josephson Voltage Standard (PJVS), is used to measure AC power. The specific measurement process is as follows: the voltage channel and the current channel of the power to be measured correspond to sinusoidal signals respectively, and the PJVS generates a step wave corresponding to each sinusoidal signal; for each sinusoidal signal, the amplitude of the sinusoidal signal is determined according to the difference between the sinusoidal signal and the step wave corresponding to the sinusoidal signal, and the amplitude of the corresponding step wave; based on the amplitude of each sinusoidal signal and the phase difference between the two sinusoidal signals, the power to be measured is determined.

[0003] However, current power measurement devices have the problem of being unable to sample the entire process. Summary of the invention

[0004] The purpose of the present application is to provide a power measurement device and method, aiming to solve the problem that the power measurement device in the traditional technology cannot sample the whole process.

[0005] A first aspect of an embodiment of the present application provides a power measurement device, including:

[0006] A conversion module, used for acquiring a voltage to be measured and a current to be measured, and converting the voltage to be measured into a first conversion voltage, and converting the current to be measured into a second conversion voltage;

[0007] A standard voltage source, which is an AC quantum voltage source and is used to generate a standard quantum voltage of a step waveform;

[0008] A first analog-to-digital converter, configured to output a first sampling value based on the standard quantum voltage and the first conversion voltage;

[0009] a second analog-to-digital converter, configured to output a second sampled value based on the standard quantum voltage and the second converted voltage; wherein the first analog-to-digital converter is configured to obtain a first voltage difference based on the standard quantum voltage and the first converted voltage, and the second analog-to-digital converter is configured to compensate the second sampled value based on the first voltage difference; or the second analog-to-digital converter is configured to obtain a second voltage difference based on the standard quantum voltage and the second converted voltage, and the first analog-to-digital converter is configured to compensate the first sampled value based on the second voltage difference;

[0010] The processor is configured to obtain the power to be measured based on the first sampling value and the second sampling value.

[0011] In some embodiments of the present application, the standard voltage source is a programmable Josephson quantum voltage source.

[0012] In some embodiments of the present application, the power measurement device further includes a first switch element and a second switch element, one end of the first switch element is connected to the first analog-to-digital converter, and the other end of the first switch element is selectively connected to the standard voltage source or ground; one end of the second switch element is connected to the first analog-to-digital converter, and the other end of the second switch element is selectively connected to the conversion module or ground;

[0013] The first analog-to-digital converter is used for performing zero-position static calibration when the first switch element and the second switch element are grounded.

[0014] In some embodiments of the present application, the power measuring device also includes a third switch element, one end of the third switch element is connected to one end of the second switch element connected to the conversion module, and the other end of the third switch element can be selectively connected to the conversion module or to the standard voltage source; the first analog-to-digital converter is used to perform initial value static calibration when the third switch element and the first switch element are both connected to the standard voltage source and the second switch element is connected to the third switch element.

[0015] In some embodiments of the present application, the power measuring device also includes a fourth switch element and a fifth switch element, one end of the fourth switch element is connected to the second analog-to-digital converter, and the other end is selectively connected to the standard voltage source or ground; the second analog-to-digital converter is used to perform zero-position static calibration when the fourth switch element and the fifth switch element are grounded.

[0016] In some embodiments of the present application, the power measuring device also includes a sixth switch element, one end of the sixth switch element is connected to one end of the fifth switch element connected to the conversion module, and the other end of the sixth switch element can be selectively connected to the conversion module or to the standard voltage source; the second analog-to-digital converter is used to perform initial value static calibration when the sixth switch element and the fourth switch element are both connected to the standard voltage source and the fifth switch element is connected to the fourth switch element.

[0017] In some embodiments of the present application, the power measurement device includes a first conversion device, the first conversion device is used to receive the voltage to be measured, and convert the voltage to be measured into the first conversion voltage according to a first target scaling factor;

[0018] And / or, the power measurement device includes a second conversion device, wherein the second conversion device is used to receive the current to be measured and convert the current to be measured into the second conversion voltage according to a first target scaling factor.

[0019] In a second aspect, the present application further provides a power measurement method, which is applied to the power measurement device as described above, and the power measurement method comprises the following steps:

[0020] Obtaining a first voltage difference based on a standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage;

[0021] Compensating a second sampled value of a second analog-to-digital converter based on the first voltage difference; or compensating a first sampled value of the first analog-to-digital converter based on the second voltage difference;

[0022] The power to be measured is obtained based on the first sampling value and the second sampling value.

[0023] In some embodiments of the present application, before obtaining a first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes:

[0024] Grounding the first switch element and the second switch element to perform a zero-position static calibration on the first analog-to-digital converter;

[0025] Alternatively, the fourth switch element and the fifth switch element are grounded to perform a zero-position static calibration on the second analog-to-digital converter.

[0026] In some embodiments of the present application, before obtaining a first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes:

[0027] Connecting the third switch element and the first switch element to the standard voltage source, and connecting the second switch element to the third switch element, so as to perform an initial value static calibration on the first analog-to-digital converter;

[0028] Alternatively, the sixth switch element and the fourth switch element are both connected to the standard voltage source, and the fifth switch element is connected to the sixth switch element, so as to perform an initial value static calibration on the second analog-to-digital converter.

[0029] In some embodiments of the present application, the power measurement method further includes:

[0030] Check whether the electric energy meter has pulse output;

[0031] If there is a pulse output, an error value of the power to be measured / electric energy to be measured is calculated based on the pulse output.

[0032] The beneficial effects of the present application are as follows: a power measurement device and method of the present application, the power measurement device comprises a conversion module, a standard voltage source, a first analog-to-digital converter, a second analog-to-digital converter and a processor; the conversion module is used to obtain a voltage to be measured and a current to be measured, and convert the voltage to be measured into a first conversion voltage, and convert the current to be measured into a second conversion voltage; the standard voltage source is an AC quantum voltage source, and is used to generate a standard quantum voltage of a step waveform; the first analog-to-digital converter is used to output a first sampling value based on the standard quantum voltage and the first conversion voltage; the second analog-to-digital converter is used to output a second sampling value based on the standard quantum voltage and the second conversion voltage; wherein the first analog-to-digital converter is used to output a first sampling value based on the standard quantum voltage and the second conversion voltage; A first voltage difference is obtained from a standard quantum voltage and a first conversion voltage, and the second analog-to-digital converter is used to compensate a second sampling value based on the first voltage difference; or the second analog-to-digital converter is used to obtain a second voltage difference based on the standard quantum voltage and the second conversion voltage, and the first analog-to-digital converter is used to compensate the first sampling value based on the second voltage difference; the processor is used to obtain a power to be measured based on the first sampling value and the second sampling value; in the present application, by setting one of the first analog-to-digital converter or the second analog-to-digital converter to generate a first voltage difference or a second voltage difference, the first voltage difference or the second voltage difference is used to compensate the sampling value of the other of the first analog-to-digital converter or the second analog-to-digital converter, thereby achieving continuous full sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the framework structure of a power measurement device provided in one embodiment of the present application;

[0034] Figure 2 A schematic diagram of the structure of a power measurement device provided in another embodiment of the present application;

[0035] Figure 3 A schematic diagram of the steps of a power measurement method provided in one embodiment of the present application.

[0036] Explanation of specific element symbols: K1A-first switch element, K1B-second switch element, K3A-third switch element, K2A-fourth switch element, K2B-fifth switch element, K3B-sixth switch element, U8A-first analog-to-digital converter, U8B-second analog-to-digital converter, U3-first conversion element, U4-second conversion element, U5-processor. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] It is important to know that with the rapid development of global science and technology, especially in the fields of power, electronic measurement and energy management, the accuracy and reliability of power and electric energy measurement are increasingly required. Internationally, quantum power and electric energy standard technology is the cornerstone for ensuring the accuracy of electric energy measurement. Its mainstream routes are mainly divided into "standard power source" solution and "standard power meter" solution. Both solutions are based on the Josephson Voltage Standard (JVS) as the traceability benchmark, providing unprecedented accuracy and stability for electric energy and power measurement.

[0041] The standard power source solution uses a high-voltage amplifier and a high-current transconductance amplifier to accurately amplify the Josephson quantum voltage, thereby generating a standard power signal that can be directly used to calibrate power or electric energy measurement equipment. The core of this solution is to use high-precision voltage power amplifiers and transconductance power amplifiers to achieve accurate signal amplification and calibration. However, in order to overcome the transition process of PJVS (programmable Josephson voltage reference) and the influence of Gibbs phenomenon, the standard power source needs to have extremely high stability. However, the research and development of high-stability power sources is difficult and costly, and complex phase separation is required for 0.5L (inductive load) and 0.5C (capacitive load), which increases the complexity of control. At the same time, the standard power source solution requires the technical threshold of precision voltage power amplifiers and transconductance power amplifiers, and the cost of use is too high. In addition, the Josephson quantum voltage needs to work in a low-temperature environment close to absolute zero (about 4K), and is very sensitive to grounding and interference signals. This requires that the standard power source solution must be operated in a standard laboratory environment, which increases the complexity of operation and maintenance.

[0042] The standard power meter solution converts the voltage and current components in the power or electric energy signal to be measured into a small voltage through a voltage divider and a current sensor, and then performs differential measurement with the quantum voltage as the reference, thereby realizing the value transfer. The standard power meter solution collects the difference between the voltage and PJVS signal and the difference between the current signal and PJVS through two differential sampling channels, reconstructs the original signal value through the difference signal and calculates the power value. However, this process places extremely high demands on the accuracy of differential measurement, and any slight error may have a significant impact on the final result. And similar to the standard power source solution, the standard power meter solution also needs to overcome the influence of the transition process of PJVS and the Gibbs phenomenon to ensure the accuracy and stability of the measurement. Similarly, since the quantum voltage needs to work in a low-temperature environment close to absolute zero, the standard power meter solution can only operate in a standard laboratory environment, which limits its flexibility in practical applications.

[0043] Based on this, the present application improves the traditional power measurement device and method.

[0044] See also Figure 1 , Figure 1 A schematic diagram of the framework structure of the power measurement device provided in this embodiment; Figure 1 The two mirror combination ADCs correspond to the first analog-to-digital converter U8A and the second analog-to-digital converter U8B respectively, the DSP control corresponds to the processor U5, and the PJVS corresponds to the standard voltage source. The power measurement device of this embodiment includes a conversion module, a standard voltage source, a first analog-to-digital converter U8A, a second analog-to-digital converter U8B and a processor U5.

[0045] It should be explained that the conversion module is responsible for acquiring the voltage and current signals to be measured and converting them into voltage signals suitable for subsequent processing. The function of the conversion module is to convert the voltage and current to be measured with larger signal amplitudes into signals close to the signal amplitude of the standard quantum voltage. Exemplarily, the signal amplitude can be 1V. Two analog-to-digital converters can be used to sample the voltage signals of the first conversion voltage, the second conversion voltage and the standard quantum voltage.

[0046] The conversion module of this embodiment is used to obtain the voltage to be measured and the current to be measured, and convert the voltage to be measured into a first conversion voltage, and convert the current to be measured into a second conversion voltage; the standard voltage source is an AC quantum voltage source, and is used to generate a standard quantum voltage with a step waveform; the first analog-to-digital converter U8A is used to output a first sampling value based on the standard quantum voltage and the first conversion voltage; the second analog-to-digital converter U8B is used to output a second sampling value based on the standard quantum voltage and the second conversion voltage; wherein the first analog-to-digital converter U8A is used to obtain a first voltage difference based on the standard quantum voltage and the first conversion voltage, and the second analog-to-digital converter U8B is used to compensate the second sampling value based on the first voltage difference; or the second analog-to-digital converter U8B is used to obtain a second voltage difference based on the standard quantum voltage and the second conversion voltage, and the first analog-to-digital converter U8A is used to compensate the first sampling value based on the second voltage difference; the processor U5 is used to obtain the power to be measured based on the first sampling value and the second sampling value.

[0047] It is understandable that the current power measurement device needs to abandon the transition process of the standard voltage source, resulting in fragmented sampling. However, in the present application, one of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B is set to generate a first voltage difference or a second voltage difference. The first voltage difference or the second voltage difference is used to compensate for the sampling value of the other of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B, thereby achieving continuous full sampling.

[0048] Furthermore, by setting the voltage difference of one of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B to compensate the sampling value of the other, it is helpful to reduce the demand of the power measurement device on the stability of the power source. For example, the power measurement device in this embodiment does not need a ppm (parts per million) level high-precision power source, but only needs an ordinary 0.05 level power source.

[0049] Specifically, in some embodiments of the present application, the high consistency (better than 0.3ppm) and good short-term stability (better than 0.3ppm) of the AD of the first analog-to-digital converter and the second analog-to-digital converter U8B are utilized. One of the first analog-to-digital converter and the second analog-to-digital converter U8B performs real-time calibration of the linearity of the low-frequency step wave output by the standard power source and generates a dynamic compensation voltage (corresponding to the first voltage difference or the second voltage difference), and the other of the first analog-to-digital converter and the second analog-to-digital converter U8B performs real-time compensation for its sampled value according to the dynamic compensation voltage, thereby achieving continuous full sampling and avoiding the influence of the transition process and Gibbs phenomenon of the standard power source. In addition, the power measurement device of the present application greatly reduces the stability requirements of the power source, and can adopt a direct sampling method without the need for a complex and time-consuming synchronization process of the power source and the standard power source, with the advantages of simple and direct sampling, the sampling process can be carried out continuously, the stability requirements of the power source are greatly simplified, and there is no need for synchronization of the standard power source and the power source.

[0050] In some embodiments of this application, please continue to refer to Figure 1 Also see Figure 2 , Figure 2 1 shows a schematic diagram of the signal waveform of the standard voltage source provided by this embodiment. The standard voltage source of this embodiment is a programmable Josephson quantum voltage source. It can be understood that the PJVS DC accuracy can reach 10 -8 The accuracy is one level higher than that of AC. Through the combination of the first analog-to-digital converter U8A and the second analog-to-digital converter U8B in the embodiment of the present application, the original AC detection accuracy can be directly traced back to the DC step voltage of PJVS. (In the middle position of the 50mS PJVS step wave, the influence of the rising and falling edges of PJVS can be ignored)

[0051] In some embodiments of this application, please continue to refer to Figure 1 The power measurement device of this embodiment further includes a first switch K1A and a second switch K1B, one end of the first switch K1A is connected to the first analog-to-digital converter U8A, and the other end of the first switch K1A can be selectively connected to a standard voltage source or grounded; one end of the second switch K1B is connected to the first analog-to-digital converter U8A, and the other end of the second switch K1B can be selectively connected to a conversion module or grounded; the first analog-to-digital converter U8A is used to perform zero-position static calibration when the first switch K1A and the second switch K1B are grounded. It can be understood that the zero-position static calibration is conducive to improving the accuracy of the first analog-to-digital converter U8A.

[0052] In some embodiments of this application, please continue to refer to Figure 1The power measurement device of this embodiment further includes a third switch K3A, one end of which is connected to one end of the second switch K1B connected to the conversion module, and the other end of the third switch K3A can be selectively connected to the conversion module or to a standard voltage source; the first analog-to-digital converter U8A is used to perform initial value static calibration when the third switch K3A and the first switch K1A are both connected to the standard voltage source and the second switch K1B is connected to the third switch K3A. It can be understood that the initial value static calibration is conducive to improving the accuracy of the first analog-to-digital converter U8A.

[0053] In some embodiments of this application, please continue to refer to Figure 1 The power measuring device of this embodiment also includes a fourth switch element K2A and a fifth switch element K2B, one end of the fourth switch element K2A is connected to the second analog-to-digital converter U8B, and the other end can be selectively connected to a standard voltage source or grounded; the second analog-to-digital converter U8B is used to perform zero-position static calibration when the fourth switch element K2A and the fifth switch element K2B are grounded.

[0054] It can be understood that zero-position static calibration is beneficial to improving the accuracy of the second analog-to-digital converter U8B.

[0055] In some embodiments of this application, please continue to refer to Figure 1 The power measurement device of this embodiment further includes a sixth switch K3B, one end of which is connected to one end of the fifth switch K2B connected to the conversion module, and the other end of the sixth switch K3B can be selectively connected to the conversion module or to a standard voltage source; the second analog-to-digital converter U8B is used to perform initial value static calibration when the sixth switch K3B and the fourth switch K2A are both connected to the standard voltage source and the fifth switch K2B is connected to the fourth switch K2A. It can be understood that the initial value static calibration is conducive to improving the accuracy of the second analog-to-digital converter U8B.

[0056] In some embodiments, zero-position static calibration and initial value static calibration are performed on both the first analog-to-digital converter U8A and the second analog-to-digital converter U8B, which is beneficial to improving the characteristic consistency of the first analog-to-digital converter U8A and the second analog-to-digital converter U8B.

[0057] In some embodiments of this application, please continue to refer to Figure 1 The power measurement device of this embodiment includes a first conversion device U3, which is used to receive a voltage to be measured and convert the voltage to be measured into a first conversion voltage according to a first target scaling factor.

[0058] In some embodiments, the first conversion device U3 is a transformer.

[0059] In some embodiments of this application, please continue to refer to Figure 1 The power measurement device of this embodiment includes a second conversion device U4, which is used to receive the current to be measured and convert the current to be measured into a second conversion voltage according to the first target scaling factor.

[0060] In some embodiments, the second conversion device U4 is a current sensor.

[0061] Please continue reading Figure 1 The power measurement device in the embodiment of the present application includes a programmable power source U2, a high-stable clock U1, a PJVS quantum voltage synthesis device U7, a first conversion device U3, a second conversion device U4, a first switch device K1A, a second switch device K1B, a third switch device K3A, a fourth switch device K2A, a fifth switch device K2B, a sixth switch device K3B, a first analog-to-digital converter U8A, a second analog-to-digital converter U8B, a processor U5 and a human-computer interaction U6.

[0062] In some embodiments, the programmable power source U2 includes an XL803F three-phase programmable power source, or includes other 0.05-level three-phase programmable power sources.

[0063] In some embodiments, the high temperature clock U1 uses a rubidium atomic clock or a clock with an accuracy better than 10 -10 clock.

[0064] In some embodiments, the PJVS quantum voltage synthesis device U7 includes a complete PJVS quantum voltage synthesis device consisting of a microwave source, a multifunctional industrial computer, a bias voltage, a quantum chip, a quantum voltage generation control software, etc. The present invention adopts the NIM-QUANTUM-001 AC quantum voltage synthesis device.

[0065] In some embodiments, the first converter adopts a voltage ratio standard of 2ppm (Parts Per Million), and different specifications can be selected according to different input voltages, such as 100V to 1V, 220V to 1V.

[0066] In some embodiments, the second converter uses precision resistors, and different specifications can be selected according to different input currents, such as 1A to 1V, 5A to 1V, 10A to 1V, and 100A to 1V.

[0067] Further, in order to better implement the power measurement device in any of the above embodiments, on the basis of the above power measurement device, refer to Figure 3 , Figure 3A schematic diagram of the steps of the power measurement method provided in this embodiment; the present application also provides a power measurement method, the power measurement method is applied to the power measurement device as described above, and the power measurement method comprises the following steps:

[0068] S100: Obtain a first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtain a second voltage difference based on the standard quantum voltage and the second conversion voltage; specifically, the standard quantum voltage is the quantum voltage signal output by PJVS, and the first voltage difference and the second voltage difference are measured by the first analog-to-digital converter U8A or the second analog-to-digital converter U8B.

[0069] S200: Compensating the second sampling value of the second analog-to-digital converter U8B based on the first voltage difference; or compensating the first sampling value of the first analog-to-digital converter U8A based on the second voltage difference;

[0070] S300: The power to be measured is obtained based on the first sampling value and the second sampling value. Specifically, in the present application, one of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B is set to generate a first voltage difference or a second voltage difference, and the first voltage difference or the second voltage difference is used to compensate for the sampling value of the other of the first analog-to-digital converter U8A or the second analog-to-digital converter U8B, thereby achieving continuous full sampling.

[0071] In some embodiments of the present application, before obtaining the first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining the second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes:

[0072] The first switch element K1A and the second switch element K1B are grounded to perform a zero-position static calibration on the first analog-to-digital converter U8A;

[0073] Alternatively, the fourth switch element K2A and the fifth switch element K2B are grounded to perform a zero-position static calibration on the second analog-to-digital converter U8B.

[0074] In some embodiments of the present application, before obtaining the first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining the second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes:

[0075] Connect the third switch element K3A and the first switch element K1A to a standard voltage source, and connect the second switch element K1B to the third switch element K3A, so as to perform an initial value static calibration on the first analog-to-digital converter U8A;

[0076] Alternatively, the sixth switch element K3B and the fourth switch element K2A are both connected to a standard voltage source, and the fifth switch element K2B is connected to the sixth switch element K3B, so as to perform an initial value static calibration on the second analog-to-digital converter U8B.

[0077] In some embodiments of the present application, the power measurement method further includes:

[0078] Check whether the electric energy meter has pulse output;

[0079] If there is a pulse output, the error value of the power to be measured / the electric energy to be measured is calculated based on the pulse output.

[0080] Specifically, the first analog-to-digital converter U8A and the second analog-to-digital converter U8B can be calibrated to zero statically by the following formula. Specifically, the DC offset voltage V of each channel needs to be offset，x Calculation:

[0081] x: channel number, 1: sampling 2: mirroring Wherein, when the channel number x is 1, it means the first analog-to-digital converter U8A and N: 50000

[0082] S i，x : sampling value.

[0084] The analog-to-digital converter that outputs the sampled value in the second analog-to-digital converter U8B, when the channel number x is 2, represents the analog-to-digital converter that outputs the voltage difference value in the first analog-to-digital converter U8A and the second analog-to-digital converter U8B. N is the number of sampling points of one step in the standard quantum voltage. i，x is the sampling value.

[0085] The first analog-to-digital converter U8A and the second analog-to-digital converter U8B can be calibrated with the following formula for initial value static calibration. Specifically, the mth step sampling value VJM in the standard quantum voltage needs to be m，x Perform calculations, And the calibration coefficient AJ required for each channel number m，x Perform the calculation:

[0086] Specifically, in the step of obtaining the compensation value, the voltage difference (dynamic compensation voltage VEm) can be calculated by the following formula:

[0087] Specifically, in the compensation step, the sampled value can be compensated by the following formula: V i =(S 1,i -V offset,1 )×AJ m,1 +VE m

[0088] m: mth PJVS step

[0089] S m,1,i : Original sampling value of sampling channel 1 at point i

[0090] AJ m,1 Calibration coefficient for sampling channel 1

[0091] VE m : Compensation voltage within the measurement range of the mth step

[0092] V offset，1： Offset compensation voltage of channel 1

[0093] V i : The sampling value of the i-th point after dynamic compensation.

[0094] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0096] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0097] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0098] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power measurement device, characterized in that: include: A conversion module, used for acquiring a voltage to be measured and a current to be measured, and converting the voltage to be measured into a first conversion voltage, and converting the current to be measured into a second conversion voltage; A standard voltage source, which is an AC quantum voltage source and is used to generate a standard quantum voltage of a step waveform; A first analog-to-digital converter, configured to output a first sampling value based on the standard quantum voltage and the first conversion voltage; a second analog-to-digital converter, configured to output a second sampled value based on the standard quantum voltage and the second converted voltage; wherein the first analog-to-digital converter is configured to obtain a first voltage difference based on the standard quantum voltage and the first converted voltage, and the second analog-to-digital converter is configured to compensate the second sampled value based on the first voltage difference; or the second analog-to-digital converter is configured to obtain a second voltage difference based on the standard quantum voltage and the second converted voltage, and the first analog-to-digital converter is configured to compensate the first sampled value based on the second voltage difference; The processor is configured to obtain the power to be measured based on the first sampling value and the second sampling value.

2. The power measurement device according to claim 1, characterized in that: The standard voltage source is a programmable Josephson quantum voltage source.

3. The power measurement device according to claim 1, characterized in that: The power measurement device further comprises a first switch element and a second switch element, wherein one end of the first switch element is connected to the first analog-to-digital converter, and the other end of the first switch element is selectively connected to the standard voltage source or ground; one end of the second switch element is connected to the first analog-to-digital converter, and the other end of the second switch element is selectively connected to the conversion module or ground; The first analog-to-digital converter is used for performing zero-position static calibration when the first switch element and the second switch element are grounded.

4. The power measurement device according to claim 3, characterized in that: The power measurement device also includes a third switch element, one end of the third switch element is connected to one end of the second switch element connected to the conversion module, and the other end of the third switch element can be selectively connected to the conversion module or to the standard voltage source; the first analog-to-digital converter is used to perform initial value static calibration when the third switch element and the first switch element are both connected to the standard voltage source and the second switch element is connected to the third switch element.

5. The power measurement device according to claim 3, characterized in that: The power measuring device also includes a fourth switch element and a fifth switch element, one end of the fourth switch element is connected to the second analog-to-digital converter, and the other end can be selectively connected to the standard voltage source or grounded; the second analog-to-digital converter is used to perform zero-position static calibration when the fourth switch element and the fifth switch element are grounded.

6. The power measurement device according to claim 5, characterized in that: The power measurement device also includes a sixth switch element, one end of the sixth switch element is connected to one end of the fifth switch element connected to the conversion module, and the other end of the sixth switch element can be selectively connected to the conversion module or to the standard voltage source; the second analog-to-digital converter is used to perform initial value static calibration when the sixth switch element and the fourth switch element are both connected to the standard voltage source and the fifth switch element is connected to the fourth switch element.

7. The power measurement device according to claim 1, characterized in that: The power measurement device comprises a first conversion device, the first conversion device being used to receive the voltage to be measured and convert the voltage to be measured into the first conversion voltage according to a first target scaling factor; And / or, the power measurement device includes a second conversion device, wherein the second conversion device is used to receive the current to be measured and convert the current to be measured into the second conversion voltage according to a first target scaling factor.

8. A power measurement method, characterized in that: The power measurement method is applied to the power measurement device according to any one of claims 1 to 7, and the power measurement method comprises the following steps: Obtaining a first voltage difference based on a standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage; Compensating a second sampled value of a second analog-to-digital converter based on the first voltage difference; or compensating a first sampled value of the first analog-to-digital converter based on the second voltage difference; The power to be measured is obtained based on the first sampling value and the second sampling value.

9. The power measurement method according to claim 8, characterized in that: Before obtaining a first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes: Grounding the first switch element and the second switch element to perform a zero-position static calibration on the first analog-to-digital converter; Alternatively, the fourth switch element and the fifth switch element are grounded to perform a zero-position static calibration on the second analog-to-digital converter.

10. The power measurement method according to claim 8, characterized in that: Before obtaining a first voltage difference based on the standard quantum voltage and the first conversion voltage; or obtaining a second voltage difference based on the standard quantum voltage and the second conversion voltage, the power measurement method further includes: Connecting the third switch element and the first switch element to the standard voltage source, and connecting the second switch element to the third switch element, so as to perform an initial value static calibration on the first analog-to-digital converter; Alternatively, the sixth switch element and the fourth switch element are both connected to the standard voltage source, and the fifth switch element is connected to the sixth switch element, so as to perform an initial value static calibration on the second analog-to-digital converter; Or the power measurement method further includes: Check whether the electric energy meter has pulse output; If there is a pulse output, an error value of the power to be measured / electric energy to be measured is calculated based on the pulse output.

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