CN116449082B - Sampling circuit and power supply system - Google Patents
Sampling circuit and power supply system Download PDFInfo
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- CN116449082B CN116449082B CN202310720688.XA CN202310720688A CN116449082B CN 116449082 B CN116449082 B CN 116449082B CN 202310720688 A CN202310720688 A CN 202310720688A CN 116449082 B CN116449082 B CN 116449082B
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- 238000005070 sampling Methods 0.000 title claims abstract description 122
- 230000008859 change Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 32
- 238000001914 filtration Methods 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 10
- 230000006641 stabilisation Effects 0.000 abstract description 6
- 238000011105 stabilization Methods 0.000 abstract description 6
- 230000005284 excitation Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Control Of Voltage And Current In General (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a sampling circuit and a power supply system, wherein the power supply system comprises the sampling circuit, the sampling circuit samples an alternating current power supply and a direct current power supply of the power supply system at the same time, and a compensation sampling signal is provided according to the obtained parallel quantity of a first sampling signal and a second sampling signal. The sampling circuit and the compensation sampling signal in the power supply system respond to the output states of the alternating current power supply and the direct current power supply of the power supply system simultaneously, have high response speed and high precision to the change of the output state of the power supply system, can effectively improve the response speed and precision of the voltage stabilization control of the power supply system which performs voltage stabilization control according to the compensation sampling signal, and improve the power supply performance.
Description
Technical Field
The present invention relates to the field of power technologies, and in particular, to a sampling circuit and a power system.
Background
Currently, mobile dc power is produced in two ways: the first is that the diesel engine drives the alternating current excitation generator, the direct current is formed by uncontrolled rectification, and the voltage regulator directly samples the direct current signal, so that the direct current voltage is constant. And secondly, the diesel engine drives an alternating-current permanent magnet generator, and voltage constant control is carried out through an AC/DC converter.
The diesel engine drives the alternating-current permanent magnet generator, and the scheme for performing constant voltage control through the AC/DC converter has high cost and poor electromagnetic compatibility.
The diesel engine drives the alternating current excitation generator, the alternating current excitation generator is rectified into direct current through a rectifying circuit, a voltage regulator directly samples direct current signals, voltage stabilization control is carried out according to sampling signals of the sampled direct current signals, and a filtering device such as a high-capacity filtering capacitor and a storage battery is connected to the rear end of the direct current power supply in parallel to enable transient response and steady-state voltage regulation of the direct current power supply to be poor.
Disclosure of Invention
Based on the above, the invention aims to provide a sampling circuit and a power supply system, which can improve the response capability and sampling precision of sampling the output voltage of the power supply system, improve the response speed and the output precision of the power supply system and improve the power supply performance.
An aspect of the present invention provides a sampling circuit for sampling a power supply in a power supply system to obtain a compensated sampling signal, where the compensated sampling signal is used for voltage regulation control of the power supply system, the sampling circuit is characterized by comprising:
the alternating current sampling module is used for providing a first sampling signal according to an alternating current power supply in the power supply system;
the direct current sampling module is used for providing a second sampling signal according to a direct current power supply in the power supply system;
an output module for providing the compensated sampling signal according to the parallel amount of the first sampling signal and the second sampling signal;
the alternating current sampling module comprises a low-pass filtering and absolute value rectifying process for the alternating current power supply.
Optionally, the ac sampling module includes:
the first voltage reduction unit is used for obtaining a first electric signal according to the alternating current power supply;
a first amplifying unit for obtaining a second electric signal according to the first electric signal;
a low-pass filtering unit, configured to obtain a third electrical signal according to the second electrical signal;
an absolute value rectifying unit for obtaining a fourth electrical signal from the third electrical signal;
a second amplifying unit for obtaining the first sampling signal according to the fourth electric signal, wherein,
the first voltage reduction unit comprises a voltage transformer, a first resistor and a second resistor, wherein the first resistor and the second resistor are respectively connected in series to two ends of a primary winding of the voltage transformer so as to be connected into the alternating current power supply through the first resistor and the second resistor, one end of a secondary winding of the voltage transformer is grounded, and the first voltage reduction unit provides the first electric signal at the other end of the secondary winding of the voltage transformer.
Optionally, the first amplifying unit includes a first operational amplifier, a third resistor, and a first capacitor, wherein,
the third resistor and the first capacitor are respectively connected in series between the output end and the negative input end of the first operational amplifier;
the positive input end of the first operational amplifier is grounded;
the first amplifying unit is connected with the first electric signal at the negative input end of the first operational amplifier, and provides the second electric signal at the output end of the first operational amplifier.
Optionally, the low-pass filtering unit includes a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, and a fourth capacitor, wherein,
the fourth resistor, the fifth resistor and the sixth resistor are sequentially connected in series to the positive input end of the second operational amplifier;
the second capacitor is connected in series between the intermediate nodes of the fourth resistor and the fifth resistor and ground;
the third capacitor is connected in series between the intermediate node of the fifth resistor and the sixth resistor and the negative input end of the second operational amplifier;
the fourth capacitor is connected in series between the positive input end of the second operational amplifier and ground;
the negative input end of the second operational amplifier is connected with the output end;
the low-pass filtering unit is connected to the second electric signal through the fourth resistor, and the third electric signal is provided at the output end of the second operational amplifier.
Optionally, the absolute value rectifying unit includes a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a diode, wherein,
the anode of the diode is connected to the output end of the third operational amplifier;
one end of the seventh resistor is connected to the input end of the third operational amplifier, and the other end of the seventh resistor is used for accessing the third electric signal;
the eighth resistor is connected in series between the negative input end of the third operational amplifier and the cathode of the diode;
the ninth resistor is connected in series between the positive input end of the third operational amplifier and ground;
the tenth resistor is connected in series between the cathode of the diode and ground;
the absolute value rectification unit provides the fourth electrical signal at the cathode of the diode.
Optionally, the second amplifying unit includes a fourth operational amplifier and an eleventh resistor, wherein,
the negative input end of the fourth operational amplifier is connected with the output end;
a first end of the eleventh resistor is connected to an output end of the fourth operational amplifier;
the second amplifying unit is connected to the fourth electric signal at the positive input end of the fourth operational amplifier, and the first sampling signal is provided at the second end of the eleventh resistor.
Optionally, the direct current sampling module includes:
the second voltage reducing unit is used for providing a fifth electric signal according to the direct current power supply;
a third amplifying unit for providing the second sampling signal according to the fifth electric signal,
the second voltage reduction unit comprises a twelfth resistor, a thirteenth resistor and a fifth capacitor, wherein the twelfth resistor and the thirteenth resistor are sequentially connected in series between a positive output end of the direct-current power supply and ground, the fifth capacitor is connected in series between an intermediate node of the twelfth resistor and the thirteenth resistor and ground, and the second voltage reduction unit provides the fifth electric signal at the intermediate node of the twelfth resistor and the thirteenth resistor.
Optionally, the third amplifying unit includes a fifth operational amplifier, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor, wherein,
one end of the fourteenth resistor is connected to the positive input end of the fifth operational amplifier;
the fifteenth resistor is connected in series between the positive input end of the fifth operational amplifier and ground;
the sixteenth resistor is connected in series between the negative input end of the fifth operational amplifier and ground;
the seventeenth resistor is connected in series between the output end and the negative input end of the fifth operational amplifier;
one end of the eighteenth resistor is connected to the output end of the fifth operational amplifier;
the third amplifying unit is connected to the fifth electric signal at the other end of the fourteenth resistor, and provides the second sampling signal at the other end of the eighteenth resistor.
Optionally, the output module comprises a potentiometer and a nineteenth resistor, wherein,
the input end of the potentiometer is connected with the parallel connection quantity of the first sampling signal and the second sampling signal, the output end of the potentiometer is grounded through the nineteenth resistor, and the output module provides the compensation sampling signal at the selection end of the potentiometer.
According to another aspect of the present invention, there is provided a power supply system including the sampling circuit provided according to the above-described present invention.
The sampling circuit provided by the invention is provided with the alternating current sampling module and the direct current sampling module, can sample the alternating current power supply and the direct current power supply in the power supply system at the same time, respectively obtain a first sampling signal and a second sampling signal, and obtain a compensation sampling signal according to the parallel connection quantity of the first sampling signal and the second sampling signal, wherein the compensation sampling signal is simultaneously responsive to the states of the alternating current power supply and the direct current power supply in the power supply system, and can accurately capture the alternating current power supply and the direct current power supply when the output state of any one of the alternating current power supply and the direct current power supply in the power supply system changes, thereby improving the response speed and the regulation precision of voltage stabilization control on the power supply system according to the compensation sampling signal and improving the performance of the power supply system. The alternating current sampling module comprises a low-pass filtering and absolute value rectifying treatment for the alternating current power supply, and can filter and remove high-frequency interference signals generated by a power supply source of a diesel engine driving alternating current excitation generator, so that the sampling accuracy is improved, the provided first sampling signal is processed into a direct current signal through the absolute value rectifying treatment, the risk that negative voltage occurs at a processing end, backflow is generated to damage a sampling circuit is reduced, and the sampling reliability of the sampling circuit is improved.
The power supply system provided by the invention comprises the sampling circuit provided by the invention, the compensation sampling signal has high response speed and high precision to the state of the power supply system, the response speed and precision of the voltage stabilizing control of the power supply system are effectively improved, and the performance of the power supply system is improved.
Drawings
FIG. 1 is a schematic diagram of a sampling circuit according to an embodiment of the present invention;
description of main reference numerals:
the invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a sampling circuit according to an embodiment of the invention is shown.
In the sampling circuit 100 of this embodiment, the sampling circuit includes an AC sampling module 110, a DC sampling module 120, and an output module including a nineteenth resistor R19 and a potentiometer R20, where the AC sampling module 110 provides a first sampling signal V1 according to AC sampling of the AC power supply, the DC sampling module 120 provides a second sampling signal V2 according to DC sampling of the DC power supply, the first sampling signal V1 and the second sampling signal V2 are connected in parallel to an input terminal of the potentiometer R20, an output terminal of the potentiometer R20 is grounded through the nineteenth resistor R19, and a compensation sampling signal VOUT is provided at a selection terminal of the potentiometer R20.
The sampling circuit 100 of this embodiment samples the output of the ac power supply and the dc power supply (the dc power supply is obtained by rectifying the ac power supply) associated with each other in the power supply system, and compensates the two sampled signals obtained by sampling in parallel, and the compensated sampled signal obtained according to the parallel amount of the two sampled signals can respond to the change of the output states of the ac power supply and the dc power supply in the power supply system at the same time, and can capture accurately in time when the output state of any one of the ac power supply and the dc power supply in the power supply system changes, so that the synchronization of the compensated sampled signal and the total output state of the power supply system is high.
The voltage stabilizing control is carried out on the power supply system according to the compensation sampling signal, the response speed of the control is high, the precision is high, and the rectifying system of the power supply system is not required to be adjusted.
The ac sampling module 110 includes a first step-down unit 111, a first amplification unit 112, a low-pass filtering unit 113, an absolute value rectifying unit 114, and a second amplification unit 115, which are sequentially disposed.
The first voltage dropping unit 111 includes a voltage transformer T1, a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are respectively connected in series to two ends of a primary winding of the voltage transformer T1 to be connected to an AC power source AC through the first resistor R1 and the second resistor R2, one end of a secondary winding of the voltage transformer T1 is grounded, and the first voltage dropping unit 111 provides a first electrical signal at the other end of the secondary winding of the voltage transformer T1.
The first step-down unit 111 converts the high-voltage AC power AC into a first electrical signal with a small current, and has low high-voltage performance requirement on the subsequent processing circuit, so that the difficulty and cost of implementing the system can be reduced.
The first amplifying unit 112 includes a first operational amplifier U1, a third resistor R3, and a first capacitor C1.
Wherein, the third resistor R3 and the first capacitor C1 are respectively connected in series between the output end and the negative input end of the first operational amplifier U1; the positive input end of the first operational amplifier U1 is grounded; the first amplifying unit 112 is connected to the first electrical signal at the negative input terminal of the first operational amplifier U1, and provides the second electrical signal at the output terminal of the first operational amplifier U1.
The first amplifying unit 112 amplifies the first electric signal of the small current to obtain the second electric signal of the ac low voltage in equal proportion to the first electric signal.
The low-pass filtering unit 113 includes a second operational amplifier U2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.
Wherein the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are sequentially connected in series to the positive input of the second operational amplifier U2; the second capacitor C2 is connected in series between the intermediate nodes of the fourth resistor R4 and the fifth resistor R5 and ground; the third capacitor C3 is connected in series between the intermediate node of the fifth resistor R5 and the sixth resistor R6 and the negative input terminal of the second operational amplifier U2; the fourth capacitor C4 is connected in series between the positive input end of the second operational amplifier U2 and the ground; the negative input end of the second operational amplifier U2 is connected with the output end; the low-pass filter unit 113 is connected to the second electric signal through the fourth resistor R4, and provides the third electric signal at the output terminal of the second operational amplifier U2.
The low-pass filter unit 113 in this embodiment is a third-order low-pass filter circuit, and filters out the high-frequency interference signal in the second electrical signal to obtain a third electrical signal.
The absolute value rectification unit 114 includes a third operational amplifier U3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R7, a tenth resistor R10, and a diode D1.
Wherein the anode of the diode D1 is connected to the output end of the third operational amplifier U3; one end of the seventh resistor R7 is connected to the input end of the third operational amplifier U3, and the other end is used for accessing a third electric signal; an eighth resistor R8 is connected in series between the negative input of the third operational amplifier U3 and the cathode of the diode D1; the ninth resistor R9 is connected in series between the positive input terminal of the third operational amplifier U3 and ground; a tenth resistor R10 is connected in series between the cathode of the diode D and ground; the absolute value rectifying unit 114 supplies a fourth electric signal at the cathode of the diode D1.
The second amplifying unit 115 includes a fourth operational amplifier U4 and an eleventh resistor R11.
The negative input end of the fourth operational amplifier U4 is connected with the output end; the first end of the eleventh resistor R11 is connected to the output end of the fourth operational amplifier U4; the second amplifying unit 115 taps the fourth electric signal at the positive input terminal of the fourth operational amplifier U4, and provides the first sampling signal at the second terminal of the eleventh resistor R11.
The absolute value rectifying unit 114 converts the third electrical signal into a fourth electrical signal of direct current, and the fourth electrical signal is further processed by the second amplifying unit 115 to obtain a first sampling signal.
The dc sampling module 120 includes: a second step-down unit 121 for providing a fifth electric signal according to the direct current power DC; the third amplifying unit 122 is configured to provide a second sampling signal according to the fifth electrical signal.
The second voltage reducing unit 121 includes a twelfth resistor R12, a thirteenth resistor R13, and a fifth capacitor C5, the twelfth resistor R12 and the thirteenth resistor R13 are sequentially connected in series between the positive output terminal of the direct current power supply DC and the ground, the fifth capacitor C5 is connected in series between an intermediate node of the twelfth resistor R12 and the thirteenth resistor R13 and the ground, and the second voltage reducing unit 121 provides a fifth electric signal at an intermediate node of the twelfth resistor R12 and the thirteenth resistor R13.
The second step-down unit 121 performs AC voltage division processing on the high-voltage dc power supply to obtain a fifth voltage signal, and stabilizes the value of the fifth voltage signal through the fifth capacitor C5, so as to primarily filter out the high-frequency interference signal in the connected dc power supply, and improve the reliability of the fifth electrical signal.
The third amplifying unit 122 includes a fifth operational amplifier U5, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18.
Wherein one end of the fourteenth resistor R14 is connected to the positive input end of the fifth operational amplifier U5; the fifteenth resistor R15 is connected in series between the positive input terminal of the fifth operational amplifier U5 and ground; the sixteenth resistor R16 is connected in series between the negative input terminal of the fifth operational amplifier U5 and ground; the seventeenth resistor R17 is connected in series between the output terminal and the negative input terminal of the fifth operational amplifier U5; one end of the eighteenth resistor R18 is connected to the output end of the fifth operational amplifier U5; the third amplifying unit 122 is connected to the fifth electric signal at the other end of the fourteenth resistor R14, and supplies the second sampling signal at the other end of the eighteenth resistor R18.
The sampling circuit 100 of the embodiment of the invention has simple overall circuit, low cost and good electromagnetic compatibility, and can be applied to a power supply system of a high-power generator such as a diesel engine driven alternating current excitation generator, so as to improve the voltage stabilizing control performance of the power supply system and the voltage stabilizing output quality of the power supply.
The invention also provides a power supply system which comprises the sampling circuit provided by the invention, so that the voltage stabilization control is carried out on the power supply system according to the compensation sampling signal provided by the sampling circuit, and the response speed and the precision of the voltage stabilization control are high. And the whole circuit is simple to realize, low in cost and good in electromagnetic compatibility.
In conclusion, the sampling circuit provided by the invention has the advantages of simple circuit, low cost and good electromagnetic compatibility, can effectively improve the voltage stabilizing control performance of a power supply system, and has good practical prospect.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A sampling circuit for sampling a power supply in a power supply system to obtain a compensated sampling signal, the compensated sampling signal being used for voltage regulation control of the power supply system, the power supply system comprising an alternator for providing an ac power supply and a rectifying circuit for providing a dc power supply output in accordance with the ac power supply, the sampling circuit comprising:
the alternating current sampling module is used for sampling the output of the alternating current power supply so as to obtain a first sampling signal;
the direct current sampling module is used for sampling the output of the direct current power supply to obtain a second sampling signal;
the output module comprises a potentiometer and a nineteenth resistor, wherein the input end of the potentiometer is connected with the parallel connection quantity of the first sampling signal and the second sampling signal, the output end of the potentiometer is grounded through the nineteenth resistor, and the output module provides the compensation sampling signal at the selection end of the potentiometer so that the compensation sampling signal can simultaneously respond to the change of the integral output voltage of the alternating current power supply and the direct current power supply and the synchronization of the compensation sampling signal and the final total output state of the power supply system is improved;
the alternating current sampling module comprises a first voltage reduction unit, a first amplifying unit, a low-pass filtering unit, an absolute value rectifying unit and a second amplifying unit which are sequentially arranged, and the alternating current sampling module is respectively used for obtaining a first electric signal according to the alternating current power supply, a second electric signal according to the first electric signal, a third electric signal according to the second electric signal, a fourth electric signal according to the third electric signal and the first sampling signal according to the fourth electric signal;
the low-pass filtering unit comprises a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor and a fourth capacitor, wherein the fourth resistor, the fifth resistor and the sixth resistor are sequentially connected in series to the positive input end of the second operational amplifier, the second capacitor is connected in series between the middle node of the fourth resistor and the fifth resistor and the ground, the third capacitor is connected in series between the middle node of the fifth resistor and the sixth resistor and the negative input end of the second operational amplifier, and the fourth capacitor is connected in series between the positive input end of the second operational amplifier and the ground; the negative input end of the second operational amplifier is connected with the output end, the low-pass filtering unit is connected with the second electric signal through the fourth resistor, and the third electric signal is provided at the output end of the second operational amplifier;
the absolute value rectifying unit comprises a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and a diode, wherein the anode of the diode is connected to the output end of the third operational amplifier, one end of the seventh resistor is connected to the input end of the third operational amplifier, the other end of the seventh resistor is used for being connected with the third electric signal, the eighth resistor is connected between the negative input end of the third operational amplifier and the cathode of the diode in series, the ninth resistor is connected between the positive input end of the third operational amplifier and the ground in series, the tenth resistor is connected between the cathode of the diode and the ground in series, and the absolute value rectifying unit provides the fourth electric signal at the cathode of the diode;
the first sampled signal, the second sampled signal, the first electrical signal, the second electrical signal, the third electrical signal, and the fourth electrical signal are voltage signals.
2. The sampling circuit of claim 1, wherein the first voltage step-down unit comprises a voltage transformer, a first resistor and a second resistor, the first resistor and the second resistor being connected in series to two ends of a primary winding of the voltage transformer, respectively, to access the ac power source through the first resistor and the second resistor, one end of a secondary winding of the voltage transformer being grounded, the first voltage step-down unit providing the first electrical signal at the other end of the secondary winding of the voltage transformer.
3. The sampling circuit of claim 2, wherein: the first amplifying unit includes a first operational amplifier, a third resistor, and a first capacitor, wherein,
the third resistor and the first capacitor are respectively connected in series between the output end and the negative input end of the first operational amplifier;
the positive input end of the first operational amplifier is grounded;
the first amplifying unit is connected with the first electric signal at the negative input end of the first operational amplifier, and provides the second electric signal at the output end of the first operational amplifier.
4. The sampling circuit of claim 2, wherein the second amplifying unit comprises a fourth operational amplifier and an eleventh resistor, wherein,
the negative input end of the fourth operational amplifier is connected with the output end;
a first end of the eleventh resistor is connected to an output end of the fourth operational amplifier;
the second amplifying unit is connected to the fourth electric signal at the positive input end of the fourth operational amplifier, and the first sampling signal is provided at the second end of the eleventh resistor.
5. The sampling circuit of claim 1, wherein the dc sampling module comprises:
the second voltage reduction unit is used for providing a fifth electric signal according to the direct current power supply, wherein the fifth electric signal is a voltage signal;
a third amplifying unit for providing the second sampling signal according to the fifth electric signal,
the second voltage reduction unit comprises a twelfth resistor, a thirteenth resistor and a fifth capacitor, wherein the twelfth resistor and the thirteenth resistor are sequentially connected in series between a positive output end of the direct-current power supply and ground, the fifth capacitor is connected in series between an intermediate node of the twelfth resistor and the thirteenth resistor and ground, and the second voltage reduction unit provides the fifth electric signal at the intermediate node of the twelfth resistor and the thirteenth resistor.
6. The sampling circuit of claim 5, wherein the third amplifying unit comprises a fifth operational amplifier, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor, wherein,
one end of the fourteenth resistor is connected to the positive input end of the fifth operational amplifier;
the fifteenth resistor is connected in series between the positive input end of the fifth operational amplifier and ground;
the sixteenth resistor is connected in series between the negative input end of the fifth operational amplifier and ground;
the seventeenth resistor is connected in series between the output end and the negative input end of the fifth operational amplifier;
one end of the eighteenth resistor is connected to the output end of the fifth operational amplifier;
the third amplifying unit is connected to the fifth electric signal at the other end of the fourteenth resistor, and provides the second sampling signal at the other end of the eighteenth resistor.
7. A power supply system comprising an alternator and a rectifying circuit, and a sampling circuit according to any one of claims 1 to 6, wherein,
the alternating current generator is used for providing alternating current power supply;
the rectification circuit is used for rectifying the alternating current power supply to provide a direct current power supply;
the sampling circuit samples the output of the alternating current power supply and the output of the direct current power supply respectively to obtain a first sampling signal and a second sampling signal, and obtains a compensation sampling signal according to the parallel quantity of the first sampling signal and the second sampling signal;
and the power supply system outputs the power outwards according to the direct current power supply and performs voltage stabilizing control on the output outwards according to the compensation sampling signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310720688.XA CN116449082B (en) | 2023-06-19 | 2023-06-19 | Sampling circuit and power supply system |
Applications Claiming Priority (1)
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