CN112286275B - Compensation method and device of active capacitive voltage divider - Google Patents
Compensation method and device of active capacitive voltage divider Download PDFInfo
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- CN112286275B CN112286275B CN202010972830.6A CN202010972830A CN112286275B CN 112286275 B CN112286275 B CN 112286275B CN 202010972830 A CN202010972830 A CN 202010972830A CN 112286275 B CN112286275 B CN 112286275B
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- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a compensation method and a device of an active capacitive voltage divider, comprising the following steps: determining an actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider, and determining an error to be compensated of the voltage divider according to the actual voltage division ratio and a rated voltage division ratio of the capacitive voltage divider; determining a compensation amount according to the error to be compensated and the error of the compensation unit; and determining the capacitance value of the compensation capacitor according to the compensation quantity and the capacitance value of the low-voltage arm capacitor, so that the capacitive voltage divider is compensated according to the compensation capacitor. The invention can realize the compensation of the voltage division ratio error of the traditional voltage divider caused by tolerance, the compensation quantity can offset the capacitance deviation of the compensation capacitor caused by temperature coefficient, the additional errors caused by each link in the compensation circuit are errors which can be ignored, and the integral output voltage division ratio error of the voltage divider can be controlled within 0.05 percent.
Description
Technical Field
The present invention relates to the field of electrical measurement technologies, and more particularly, to a compensation method and apparatus for an active capacitive voltage divider.
Background
Capacitive voltage dividers are commonly used measurement devices in high voltage measurements. Traditional passive capacitive voltage divider adopts many electric capacity series connection forms, and the meter is connected to the secondary, because the input impedance influence of meter, the whole partial pressure ratio of voltage divider can change, in order to obtain better output performance, can adopt active electronic circuit and the mode that passive voltage divider body combined together and used. One scheme is that a voltage follower is added between the output of the voltage divider and the rear-end load, and the follower has the characteristics of high input impedance and low output impedance, so that the measurement accuracy can be obviously improved. Or a mode of converting capacitance current into voltage is adopted, and a specific design is given in a paper 'development of an active capacitive voltage divider', however, the tolerance of a commercial capacitor is generally 5% for manufacturing elements of the capacitive voltage divider, the commercial capacitor can be configured within 1% after matching, the capacitive voltage divider uses an actual transformation ratio, namely the transformation ratio is determined according to an actual measurement result, and the error of the transformation ratio with the design can be controlled to be only about 1%. If the design transformation ratio of the voltage divider is 1000, and the transformation ratio of the actual voltage divider is 995.6 due to the tolerance problem of the device, the voltage divider is used according to 995.6. And many times, the rated transformation ratio of the voltage divider needs to be used for work, for example, in the verification procedure of JJG 496 and 2016 (Industrial frequency high Voltage divider), a differential measurement method is used for verifying the tested voltage divider, and the voltage divider with the high-accuracy rated transformation ratio is needed.
Therefore, it is necessary to design a compensation method to reduce the overall voltage division ratio error due to the tolerance and improve the output accuracy of the voltage divider.
Disclosure of Invention
The invention provides a compensation method and a compensation device of an active capacitive voltage divider, which aim to solve the problem of how to compensate the error of the active capacitive voltage divider and reduce the voltage division ratio error of the capacitive voltage divider.
In order to solve the above problem, according to an aspect of the present invention, there is provided a compensation method of an active capacitive divider, the capacitive divider comprising: the compensation unit is connected with two ends of the compensation capacitor and the compensation capacitor, and the compensation unit is respectively connected with the output end of the low-voltage arm capacitor of the capacitive voltage divider and the output end of the first operational amplifier, and the method comprises the following steps:
determining an actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider, and determining an error to be compensated of the voltage divider according to the actual voltage division ratio and a rated voltage division ratio of the capacitive voltage divider;
determining a compensation amount according to the error to be compensated and the error of the compensation unit;
and determining the capacitance value of the compensation capacitor according to the compensation quantity and the capacitance value of the low-voltage arm capacitor, so that the capacitive voltage divider is compensated according to the compensation capacitor.
Preferably, the determining the capacitance value of the compensation capacitor according to the compensation amount and the capacitance value of the low-voltage arm capacitor comprises:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
Preferably, the low-voltage arm capacitor and the compensation capacitor are made of the same material.
Preferably, wherein the method further comprises:
constructing the compensation unit; wherein the compensation unit includes: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of the third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
According to another aspect of the present invention, there is provided a compensation arrangement for an active capacitive voltage divider, the capacitive voltage divider comprising: the compensation unit that the compensation electric capacity that is connected with the output of the low pressure arm electric capacity of capacitive voltage divider and the output of first operational amplifier and be connected with the both ends of compensation electric capacity respectively, the device includes:
the device comprises a to-be-compensated error determining module, a voltage divider and a compensation error determining module, wherein the to-be-compensated error determining module is used for determining the actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider and determining the to-be-compensated error of the voltage divider according to the actual voltage division ratio and the rated voltage division ratio of the capacitive voltage divider;
the compensation quantity determining module is used for determining the compensation quantity according to the error to be compensated and the error of the compensation unit;
and the compensation capacitance determining module is used for determining the capacitance value of the compensation capacitance according to the compensation quantity and the capacitance value of the low-voltage arm capacitance, so that the capacitive voltage divider is compensated according to the compensation capacitance.
Preferably, the compensation capacitance determining module determines the capacitance value of the compensation capacitance according to the compensation amount and the capacitance value of the low-voltage arm capacitance, and includes:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
Preferably, the low-voltage arm capacitor and the compensation capacitor are made of the same material.
Preferably, the compensation unit comprises: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of the third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
The invention provides a compensation method and a device of an active capacitive voltage divider, which determine the error to be compensated of the voltage divider according to the actual voltage dividing ratio and the rated voltage dividing ratio of a capacitor; determining a compensation amount according to the error to be compensated and the error of the compensation unit; determining the capacitance value of a compensation capacitor according to the compensation quantity and the capacitance value of the low-voltage arm capacitor, so as to realize compensation of the capacitive voltage divider according to the compensation capacitor; the invention can realize the compensation of the voltage division ratio error caused by the tolerance of the traditional voltage divider, the compensation quantity can offset the capacitance deviation caused by the temperature coefficient of the compensation capacitor, the additional errors caused by each link in the compensation circuit are errors which can be ignored, and the integral output voltage division ratio error of the voltage divider can be controlled within 0.05 percent.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow diagram of a method 100 for compensating an active capacitive divider according to an embodiment of the present invention;
FIG. 2 is a basic schematic diagram of a conventional active capacitive voltage divider;
FIG. 3 is a schematic diagram of the compensation principle according to an embodiment of the present invention;
FIG. 4 is an exemplary diagram of a simulation using Multisim according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a compensation apparatus 500 of an active capacitive voltage divider according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a compensation method 100 for an active capacitive divider according to an embodiment of the present invention. As shown in fig. 1, the compensation method for an active capacitive voltage divider according to the embodiment of the present invention can compensate a voltage division ratio error of a conventional voltage divider due to tolerance, and the compensation amount can offset capacitance deviation of a compensation capacitor due to a temperature coefficient, and additional errors caused by various links in a compensation circuit are errors of errors, which can be ignored, so that the overall output voltage division ratio error of the voltage divider can be controlled within 0.05%. The compensation method 100 for the active capacitive voltage divider provided by the embodiment of the present invention starts from step 101, where the capacitive voltage divider includes: the compensation unit is connected with the two ends of the compensation capacitor. In step 101, an actual voltage division ratio of the capacitive voltage divider is determined according to an input voltage and an output voltage of the capacitive voltage divider, and an error to be compensated of the capacitive voltage divider is determined according to the actual voltage division ratio and a rated voltage division ratio of the capacitive voltage divider.
In step 102, a compensation amount is determined according to the error to be compensated and the error of the compensation unit.
Preferably, wherein the method further comprises:
constructing the compensation unit; wherein the compensation unit includes: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of the third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
In step 103, the capacitance value of the compensation capacitor is determined according to the compensation amount and the capacitance value of the low-voltage arm capacitor, so that the capacitive voltage divider is compensated according to the compensation capacitor.
Preferably, the determining the capacitance value of the compensation capacitor according to the compensation amount and the capacitance value of the low-voltage arm capacitor comprises:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
Fig. 2 is a basic schematic diagram of a conventional active capacitive voltage divider. As shown in fig. 2, the active capacitive voltage divider includes a high-voltage arm capacitor C1 and a low-voltage arm capacitor C2, and an operational amplifier OP 1.
If the output error of the voltage divider is epsilon 0, the input and output voltages satisfy the following formula.
Fig. 3 is a schematic diagram of a compensation principle according to an embodiment of the present invention. As shown in fig. 3, on the basis of the low-voltage arm C2 of the active capacitive voltage divider of fig. 2, a compensation capacitor C3 is inserted, and the voltage at the C2 end is led to the rear end for output through a voltage follower circuit (including R2, R3 and an operational amplifier OP2), the voltage is denoted as V1, and the voltage at the output end of the operational amplifier OP2 is V1. The differential operational amplifier circuit (comprising R8, R9 and an operational amplifier OP4) is connected to the C3, the voltage at two ends of the C3 is converted into a single-ended signal, and then the single-ended signal is used for back-end compensation, and the compensation voltage is Vc. A compensating circuit is connected at the rear end of the output of the voltage division circuit (comprising R6, R7 and an operational amplifier OP 5); the compensation circuit includes: r4, R5, an operational amplifier OP3 and a precision isolation transformer (ratio of 1: 1). The two resistors R4 and R5 are connected in series, the middle connecting point is connected with the inverting input end of OP3, the voltage is marked as V-, the other end of R5 is connected with the output end of OP3, and the voltage is marked as Vo; vo is connected to one input end of the precision transformer; the compensation voltage Vc is connected to the other input end of the precision isolation transformer; one output end of the precision isolation mutual inductor is grounded, and the other output end of the precision isolation mutual inductor is connected to the non-inverting input end of the OP3 in a feedback mode; the same-name ends of the precision isolation mutual inductor are an output connection end and a feedback output end of the OP 3. According to the circuit shown in fig. 3, for the compensation unit section, there is the following formula:
V - ＝Vf (3)
if the error of the precision isolation voltage transformer is epsilon 1, the following steps are carried out:
Vf＝(Vo-Vc)(1+ε1) (4)
the finishing formulae (1), (2) and (3) have:
since the capacitors C2 and C3 are connected in the same feedback loop, there are:
and the positive and negative values can be adjusted by adjusting the directions of the non-inverting and inverting input ends of the differential operational amplifier OP 4.
Substituting equations (1) and (6) into (5) yields:
if the error ε 0 of the voltage divider is-0.01, let R1 be 1k Ω, R2 be 10M Ω, C2 be 100nF, and C3 be 10uF, then after the compensation unit:
it can be found that if Vo output is the rated value proportion of C1 and C2, the error is the isolation transformer error. Therefore, if the error of the isolation transformer can be within 0.001%, the error of the capacitive voltage divider can be compensated to be within 0.05%, and the compensation amount is the capacitance ratio of C2 and C3. Since the error of the isolation transformer is known, the capacitance value of C3 may be controlled according to the compensation amount.
Therefore, in an embodiment of the present invention, the process of implementing compensation includes: firstly, the actual voltage division ratio of the capacitive voltage divider is determined according to the input voltage and the output voltage of the capacitive voltage divider, and the error to be compensated of the capacitive voltage divider (namely, the error to be compensated of the capacitive voltage divider is determined according to the actual voltage division ratio and the rated voltage division ratio of the capacitive voltage divider
) (ii) a Then, a compensation quantity (namely, the error epsilon 1 of the isolation transformer) is determined according to the error to be compensated and the error of the compensation unit (namely, the error epsilon 1 of the isolation transformer)
) (ii) a And finally, calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation amount as the capacitance value of the compensation capacitor C3, and setting the compensation capacitor according to the capacitance value of the compensation capacitor, namely realizing the compensation of the capacitive voltage divider according to the compensation capacitor.
Firstly, after a compensation amount is determined, the ratio of the capacitance value of the low-voltage arm capacitor to the compensation amount is calculated as the capacitance value of the compensation capacitor C3, so that the capacitive voltage divider can be compensated according to the compensation capacitor.
Preferably, the low-voltage arm capacitor and the compensation capacitor are made of the same material.
In order to satisfy the capacitance of C2 and C3, there is no error in temperature variation, thereby affecting the compensation amount. In the embodiment of the invention, the capacitors C2 and C3 are made of the same dielectric material, and the capacitance changes of the capacitors can be offset when the temperature changes, so that the compensation quantity is not influenced. In addition, the additional errors brought by each link in the compensation unit are errors of errors which can be ignored.
Fig. 4 is an exemplary diagram of a simulation using Multisim according to an embodiment of the present invention. As shown in fig. 4, a 100kV active capacitive voltage divider is taken as an example, and the primary rated voltage is 100kV and the secondary rated output voltage is 5V. The capacitor high-voltage arm capacitor C1 is a 100kV gas capacitor with the capacitance of 50 pF. The low-voltage arm capacitor is a multilayer ceramic capacitor, the rated capacitance of C2 is 1 muF, and the output error of the voltage divider V1 is 0.5%.
According to analysis, VC/V1 should be-0.5%, namely C2/C3 is 0.5%, then the capacitance value of C3 is 200uF, and the multilayer ceramic capacitor with the capacitance value is difficult to construct, therefore, an active voltage divider formed by R6, R7 and OP5 is added in a compensation voltage loop, the resistor is a common chip resistor with the tolerance of 1%, the resistance value of R6 is 10k omega, R7 is 100 omega, and the rated voltage division ratio is 100. For this reason, the capacitance of C3 takes 2 μ F. As shown in fig. 4, R1 is 10M Ω, R2 is 470 Ω, R3 is 470 Ω, R4 is 1k Ω, and R5 is 10M Ω, all of which are patch resistances with a tolerance of 1%. OP4 selects a precise differential operational amplifier AD8421, unit gain is set, error is less than 0.01%, and linearity is better than 0.0002%. OP1 and OP5 are two OP amplifiers in OPA2140 one chip, and OP2 and OP3 are two OP amplifiers in OPA2140 one chip. All chips are powered by a +/-15V direct-current power supply. The precise isolation mutual inductor adopts a two-stage mutual inductor structure, the first stage uses silicon steel sheets as iron cores, the primary excitation winding is 200 turns, the second stage iron core adopts permalloy iron cores, the primary proportional winding is 200 turns, and the secondary proportional winding is 200 turns. The ratio is 1: 1.
In order to verify the voltage division effect, a simulation circuit is built in circuit simulation software Multisim, the low-voltage capacitor tolerance is set to be-0.5%, the VC feedback voltage division error is 0.1%, the isolation transformer error is 0.001%, the simulation result is visible, the output error is 0.0014%, the calculation result is consistent, and the compensation result is not influenced by the feedback capacitor and the feedback loop error.
Fig. 5 is a schematic structural diagram of a compensation apparatus 500 of an active capacitive voltage divider according to an embodiment of the present invention. As shown in fig. 5, the compensation apparatus 500 of the active capacitive divider according to the embodiment of the present invention includes: an error to be compensated determining module 501, a compensation amount determining module 502 and a compensation capacitance determining module 503. Wherein the capacitive voltage divider comprises: the compensation unit is connected with the two ends of the compensation capacitor.
Preferably, the to-be-compensated error determining module 501 is configured to determine an actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider, and determine an to-be-compensated error of the voltage divider according to the actual voltage division ratio and a rated voltage division ratio of the capacitive voltage divider.
Preferably, the compensation amount determining module 502 is configured to determine a compensation amount according to the error to be compensated and the error of the compensation unit.
Preferably, the compensation capacitance determining module 503 is configured to determine a capacitance value of a compensation capacitance according to the compensation amount and a capacitance value of a low-voltage arm capacitance, so as to implement compensation of the capacitive voltage divider according to the compensation capacitance.
Preferably, the determining module 503 of the compensation capacitance determines the capacitance value of the compensation capacitance according to the compensation amount and the capacitance value of the low-voltage arm capacitance, and includes:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
Preferably, the low-voltage arm capacitor and the compensation capacitor are made of the same material.
Preferably, the compensation unit comprises: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of the third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
The compensation apparatus 500 of the active capacitive divider according to the embodiment of the present invention corresponds to the compensation method 100 of the active capacitive divider according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the ones disclosed above are equally possible within the scope of these appended patent claims, as these are known to those skilled in the art.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. A method of compensating an active capacitive divider, the capacitive divider comprising: the compensation unit is connected with two ends of the compensation capacitor and the compensation capacitor, and the compensation unit is respectively connected with the output end of the low-voltage arm capacitor of the capacitive voltage divider and the output end of the first operational amplifier, and the method comprises the following steps:
determining an actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider, and determining an error to be compensated of the voltage divider according to the actual voltage division ratio and a rated voltage division ratio of the capacitive voltage divider;
determining a compensation amount according to the error to be compensated and the error of the compensation unit;
determining the capacitance value of a compensation capacitor according to the compensation quantity and the capacitance value of the low-voltage arm capacitor, so as to realize compensation of the capacitive voltage divider according to the compensation capacitor;
wherein the method further comprises:
constructing the compensation unit; wherein the compensation unit includes: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of a third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
2. The method of claim 1, wherein determining the capacitance value of the compensation capacitor based on the compensation amount and the capacitance value of the low-voltage arm capacitor comprises:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
3. The method of claim 1, wherein the low-side arm capacitor and the compensation capacitor are made of the same material.
4. An active capacitive divider compensation apparatus, the capacitive divider comprising: the compensation unit that the compensation electric capacity that is connected with the output of the low pressure arm electric capacity of capacitive voltage divider and the output of first operational amplifier and be connected with the both ends of compensation electric capacity respectively, the device includes:
the device comprises a to-be-compensated error determining module, a voltage divider and a compensation error determining module, wherein the to-be-compensated error determining module is used for determining the actual voltage division ratio of the capacitive voltage divider according to the input voltage and the output voltage of the capacitive voltage divider and determining the to-be-compensated error of the voltage divider according to the actual voltage division ratio and the rated voltage division ratio of the capacitive voltage divider;
the compensation quantity determining module is used for determining the compensation quantity according to the error to be compensated and the error of the compensation unit;
the compensation capacitor determining module is used for determining the capacitance value of the compensation capacitor according to the compensation quantity and the capacitance value of the low-voltage arm capacitor, so that the capacitive voltage divider is compensated according to the compensation capacitor;
wherein the compensation unit includes: voltage follower circuit, difference operational amplifier circuit, compensating circuit and bleeder circuit, the compensating circuit includes: the circuit comprises a first resistor, a second operational amplifier and an isolation transformer; the output end of the voltage follower circuit is respectively connected with one end of a first resistor and the input end of the differential operational amplifier circuit; the input end of the differential operational amplifier circuit is also connected with a connection point of a third capacitor and the output end of the first operational amplifier, and the output end of the differential operational amplifier circuit is connected with the voltage division circuit; the other end of the first resistor is connected with one end of a second resistor, the connection point of the first resistor and the second resistor is connected with the reverse input end of a second operational amplifier, the other end of the second resistor is connected with the output end of the second operational amplifier, two input ends of the isolation mutual inductor are respectively connected with the output end of the second operational amplifier and the output end of the voltage division circuit, one output end of the isolation mutual inductor is connected with the non-inverting input end of the second operational amplifier, and the other output end of the isolation mutual inductor is grounded; the homonymous ends of the isolation mutual inductor are the output connecting end and the feedback output end of the second operational amplifier.
5. The apparatus of claim 4, wherein the compensation capacitance determining module determines the capacitance value of the compensation capacitance according to the compensation amount and the capacitance value of the low-voltage arm capacitance, and comprises:
and calculating the ratio of the capacitance value of the low-voltage arm capacitor to the compensation quantity, wherein the ratio is the capacitance value of the compensation capacitor.
6. The apparatus of claim 4, wherein the low-side arm capacitor and the compensation capacitor are made of the same material.
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