CN211698120U - Calibration circuit and equipment for direct-current power supply metering parameters - Google Patents
Calibration circuit and equipment for direct-current power supply metering parameters Download PDFInfo
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- CN211698120U CN211698120U CN201921974135.2U CN201921974135U CN211698120U CN 211698120 U CN211698120 U CN 211698120U CN 201921974135 U CN201921974135 U CN 201921974135U CN 211698120 U CN211698120 U CN 211698120U
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Abstract
The utility model relates to a calibration circuit and equipment of DC power supply measurement parameter, include: the device comprises an alternating current voltage regulating output end, a direct current power supply measuring end, a direct current load input end, an alternating current voltage regulating unit, a direct current adjustable load unit, a direct current signal sampling unit, a ripple voltage measuring unit and a main control unit; the output end of the alternating current voltage regulating unit is connected with the alternating current voltage regulating output end, and the controlled end of the alternating current voltage regulating unit is connected with the control end of the main control unit; the measuring end of the direct current signal sampling unit and the measuring end of the ripple voltage measuring unit are respectively connected with the measuring end of the direct current power supply; the output end of the direct current signal sampling unit and the output end of the ripple voltage measuring unit are respectively connected with the input end of the main control unit; the input end of the direct current adjustable load unit is connected with the input end of the direct current load, and the controlled end of the direct current adjustable load unit is connected with the control end of the main control unit. The problems that in the prior art, a calibration instrument is inconvenient to carry and low in calibration efficiency are solved.
Description
Technical Field
The utility model relates to a power measurement parameter calibration field especially relates to a calibration circuit and equipment of DC power supply measurement parameter.
Background
At present, a plurality of different precision measurement instruments are used for metering and calibrating, the calibration work of a direct current stable power supply is completed by combined use, and the plurality of precision measurement instruments required to be used comprise: high-grade digital multimeters, precision shunts, voltage regulators or alternating current adjustable power supplies, alternating current millivoltmeter (or oscillograph), sliding resistance loads (or active electronic loads), and the like. In actual work, because a plurality of instruments need to be carried, the calibration process is very complicated; secondly, because the instrument needs to be replaced frequently, errors occur frequently in the calibration process, and the calibration efficiency is low.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a calibration circuit and equipment of DC power supply measurement parameter has solved among the prior art problem that calibration instrument carries inconveniently, and calibration efficiency is low.
In order to achieve the above purpose, the utility model can be realized by the following technical proposal:
a calibration circuit for metering parameters of a DC power supply, comprising: the device comprises an alternating current voltage regulating output end, a direct current power supply measuring end, a direct current load input end, an alternating current voltage regulating unit for calibrating a voltage regulation rate, a direct current adjustable load unit for calibrating the load regulation rate, a direct current signal sampling unit for measuring direct current voltage and direct current, a ripple voltage measuring unit for measuring ripple voltage, and a main control unit for receiving the measured voltage regulation rate, the measured load regulation rate, the measured direct current voltage, the direct current and the ripple voltage and calibrating according to the voltage regulation rate and the load regulation rate;
the output end of the alternating current voltage regulating unit is connected with the alternating current voltage regulating output end, and the controlled end of the alternating current voltage regulating unit is connected with the control end of the main control unit;
the measuring end of the direct current signal sampling unit and the measuring end of the ripple voltage measuring unit are respectively connected with the measuring end of the direct current power supply; the output end of the direct current signal sampling unit and the output end of the ripple voltage measuring unit are respectively connected with the input end of the main control unit;
the input end of the direct current adjustable load unit is connected with the input end of the direct current load, and the controlled end of the direct current adjustable load unit is connected with the control end of the main control unit.
Compared with the prior art, the embodiment of the utility model discloses a calibration circuit of DC power supply measurement parameter sends the measuring signal with DC signal sampling unit, ripple voltage measurement unit to the main control unit, and the main control unit exchanges voltage regulating unit and the adjustable load unit of direct current according to measurement standard control to calibrate DC power supply's measurement parameter. Therefore, the calibration circuit for the metering parameters of the direct-current power supply can integrate the calibration function into the same equipment, so that the instrument is more convenient to carry; and manual alignment operation of the measuring instrument is avoided, so that the measuring result is more accurate, and the calibration efficiency is improved.
As an improvement of the above scheme, the dc signal sampling unit includes: the direct current measuring unit is used for measuring direct current;
the measuring end of the direct current voltage measuring unit and the measuring end of the direct current measuring unit are respectively connected with the measuring end of the direct current power supply, and the synchronous control end of the direct current voltage measuring unit is connected with the synchronous control end of the direct current measuring unit.
As an improvement of the above, the circuit further includes: a display unit;
the display unit is connected with the main control unit.
As an improvement of the above, the circuit further includes: a keyboard circuit;
the output end of the keyboard circuit is connected with the input end of the control unit.
As an improvement of the above solution, the dc adjustable load unit includes: at least one dc adjustable load.
As an improvement of the above scheme, the main control unit includes: the power amplifier comprises a buffer, a power amplifier, a first voltage amplifier, a second voltage amplifier, a third voltage amplifier, a fourth voltage amplifier, a fifth voltage amplifier, a first power supply and a first digital-to-analog converter;
the non-inverting input end of the power amplifier is respectively connected with the output end of the direct current signal sampling unit and the output end of the ripple voltage measuring unit, the inverting input end of the power amplifier is connected with the output end of the power amplifier, the output end of the power amplifier is connected with the inverting input end of the first voltage amplifier, the non-inverting input end of the first voltage amplifier is grounded, the output end of the first voltage amplifier is connected with the inverting input end of the second voltage amplifier, the non-inverting input end of the second voltage amplifier is connected between the inverting input end of the second voltage amplifier and the output end of the first voltage amplifier, and the output end of the second voltage amplifier is connected with the non-inverting input end of a third voltage amplifier;
the input end of the buffer is connected with a first power supply, the output end of the buffer is connected with the non-inverting input end of a fourth voltage amplifier, the inverting input end of the fourth voltage amplifier is connected with the output end of the fourth voltage amplifier, and the output end of the fourth voltage amplifier is connected with the reference voltage input end of the first digital-to-analog converter;
the output end of the first digital-to-analog converter is respectively connected with the inverting input end of a fifth voltage amplifier and the non-inverting input end of a third voltage amplifier, the grounding end of the first digital-to-analog converter is grounded, the grounding end of the first digital-to-analog converter is also connected with the non-inverting input end of the fifth voltage amplifier, and the output end of the fifth voltage amplifier is connected between the output end of the first digital-to-analog converter and the inverting input end of the fifth voltage amplifier.
As an improvement of the above, the ripple voltage measurement unit includes: the device comprises a first current amplifier, a second current amplifier, a third current amplifier, a first analog-to-digital converter, a first analog switch and a direct current converter;
the non-inverting input end of the first current amplifier is connected with the direct-current power supply measuring end, the inverting input end of the first current amplifier is connected with the output end of the first current amplifier, the output end of the first current amplifier is respectively connected with the output end of the second current amplifier and the output end of the first analog switch, and the input end of the first analog switch is connected with the second power supply;
the non-inverting input end of the second current amplifier is grounded, the output end of the second current amplifier is connected with the inverting input end of the third current amplifier, the non-inverting input end of the third current amplifier is grounded, the output end of the third current amplifier is connected with the first input end of the direct current converter, the first output end of the direct current converter is connected with the second input end of the direct current converter, the control input end of the direct current converter is connected between the first output end of the direct current converter and the second input end of the direct current converter, and the second output end of the direct current converter is connected with the first analog-to-digital converter.
As an improvement of the above aspect, the direct current measuring unit includes: the first voltage management chip comprises a sixth voltage amplifier, a seventh voltage amplifier, a first voltage management chip and a second analog-to-digital converter;
the inverting input end of the sixth voltage amplifier is connected with the direct-current power supply measuring end, the non-inverting input end of the sixth voltage amplifier is grounded, the output end of the sixth voltage amplifier is connected with the second analog-to-digital converter and the input end of the first voltage management chip, and the synchronous control end of the first voltage management chip is connected with the direct-current voltage measuring unit;
the non-inverting input end of the seventh voltage amplifier is grounded, the inverting input end of the seventh voltage amplifier is connected between the output end of the sixth voltage amplifier and the input end of the first voltage management chip, and the output end of the seventh voltage amplifier is connected with the inverting input end of the seventh voltage amplifier.
As an improvement of the above aspect, the dc voltage measuring unit includes: the first amplifier, the second analog switch, the third analog switch and the second voltage management chip;
the inverting input end of the first amplifier is connected with the direct-current power supply measuring end, the non-inverting input end of the first amplifier is grounded, the output end of the first amplifier is connected with the inverting input end of the second amplifier, the non-inverting input end of the second amplifier is grounded, the output end of the second amplifier is connected with the input end of the second voltage management chip, and the synchronous control end of the second voltage management chip is connected with the direct-current measuring unit;
a first input end of the second analog switch is connected with an inverting input end of the first amplifier, a first communication end of the second analog switch is connected with an output end of the first amplifier, and a second communication end of the second analog switch is connected with an output end of the first amplifier;
the first communication end of the third analog switch is connected between the second communication end of the second analog switch and the output end of the first amplifier, the second communication end of the third analog switch is connected with the output end of the second amplifier, and the input end of the third analog switch is connected between the output end of the first amplifier and the inverting input end of the second amplifier.
The embodiment of the utility model provides a still provide a calibration equipment of DC power supply measurement parameter, include: and the calibration circuit of the metering parameters of the direct-current power supply.
Compared with the prior art, the calibration equipment for the metering parameters of the direct-current power supply provided by the embodiment of the utility model adopts the calibration circuit for the metering parameters of the direct-current power supply, so that the calibration function is integrated in the same equipment, and the instrument is more convenient to carry; and manual alignment operation of the measuring instrument is avoided, so that the measuring result is more accurate, and the calibration efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a calibration circuit for measuring parameters of a dc power supply according to the present invention.
Fig. 2 is a specific structure diagram of a calibration circuit for dc power measurement parameters according to the present invention.
Fig. 3 is a schematic circuit diagram of the main control unit of the present invention.
Fig. 4 is a specific circuit schematic diagram of the ripple voltage measurement unit of the present invention.
Fig. 5 is a schematic circuit diagram of the dc current measuring unit according to the present invention.
Fig. 6 is a schematic circuit diagram of the dc voltage measuring unit according to the present invention.
Reference numerals: 1. a ripple voltage measuring unit; 2. a direct current signal sampling unit; 3. a direct current adjustable load unit; 4. an AC voltage regulation unit; 5. a main control unit; 6. a display unit; 7. a keyboard circuit.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments:
referring to fig. 1, the utility model provides an embodiment is a calibration circuit of dc power supply measurement parameter, include: the device comprises an alternating current voltage regulating output end, a direct current power supply measuring end, a direct current load input end, an alternating current voltage regulating unit 4 for calibrating a voltage regulation rate, a direct current adjustable load unit 3 for calibrating the load regulation rate, a direct current signal sampling unit 2 for measuring direct current voltage and direct current, a ripple voltage measuring unit 1 for measuring ripple voltage, and a main control unit 5 for receiving the measured voltage regulation rate, the measured load regulation rate, the measured direct current voltage, the direct current and the ripple voltage and calibrating according to the voltage regulation rate and the load regulation rate. In this embodiment, the ac voltage regulating unit 4 is designed mainly for the calibration requirement of the regulated output source voltage regulation rate of the dc regulated power supply, and provides the calibrated dc regulated power supply with variable voltage in a wide range and variable frequency operation in a power frequency range
The output end of the alternating current voltage regulating unit 4 is connected with the alternating current voltage regulating output end, and the controlled end of the alternating current voltage regulating unit 4 is connected with the control end of the main control unit 5;
the measuring end of the direct current signal sampling unit 2 and the measuring end of the ripple voltage measuring unit 1 are respectively connected with the measuring end of the direct current power supply; the output end of the direct current signal sampling unit 2 and the output end of the ripple voltage measuring unit 1 are respectively connected with the input end of the main control unit 5;
the input end of the direct current adjustable load unit 3 is connected with the direct current load input end, and the controlled end of the direct current adjustable load unit 3 is connected with the control end of the main control unit 5.
The working principle is as follows:
the direct current signal sampling unit 2 and the ripple voltage measuring unit 1 measure the direct current voltage, the direct current and the ripple voltage of the direct current voltage source to be measured. The control unit tests the power supply parameters according to the measurement standard, and the main control unit 5 controls the alternating current voltage regulating unit 4 and the direct current adjustable load unit 3 according to the measurement standard, so that the measurement parameters of the direct current power supply are calibrated. In the present embodiment, the calibration standard of the dc regulated power supply is generally adopted as the metering standard.
To sum up, the calibration circuit for the direct current power supply metering parameters disclosed in the embodiment of the present invention can integrate the calibration function into the same device by sending the measurement signals of the direct current signal sampling unit 2 and the ripple voltage measurement unit 1 to the main control unit 5, so that the instrument can be more conveniently carried; and manual alignment operation of the measuring instrument is avoided, so that the measuring result is more accurate, and the calibration efficiency is improved.
As an improvement of the above scheme, the dc signal sampling unit 2 includes: the direct current measuring device comprises a direct current voltage measuring unit for measuring direct current voltage and a direct current measuring unit for measuring direct current.
The measuring end of the direct current voltage measuring unit and the measuring end of the direct current measuring unit are respectively connected with the measuring end of the direct current power supply, and the synchronous control end of the direct current voltage measuring unit is connected with the synchronous control end of the direct current measuring unit.
In this embodiment, the dc signal sampling and converting unit includes a dc voltage measuring unit and a dc current measuring unit, the dc voltage measuring unit is designed mainly for the calibration requirements of the items of indication error of the regulated voltage setting value, indication error of the dc voltage measurement value, and short-term stability of regulated voltage output, and the output voltage accurate measurement function and the short-term stability calculation analysis calibration function of the dc regulated power supply can be completed by using the same device without using a digital voltmeter or a digital multimeter in the conventional calibration apparatus.
As an improvement of the above, the circuit further includes: a display unit 6; the display unit 6 is connected with the main control unit 5.
Specifically, referring to fig. 2, since the main control circuit is connected to the display unit 6, the calibration circuit for the dc power metering parameter can display according to the measurement result. The display unit 6 may be a display screen.
As an improvement of the above, the circuit further includes: a keyboard circuit 7; the output end of the keyboard circuit 7 is connected with the input end of the control unit. The keyboard circuit 7 may be a matrix keyboard, and may also be another keyboard circuit 7, which is not limited herein.
Specifically, referring to fig. 2, since the main control circuit is connected to the keyboard circuit 7, the user can control each module in the above circuits through the keyboard.
As an improvement of the above solution, the dc adjustable load unit 3 includes: at least one dc adjustable load. The direct current adjustable load unit 3 can also be used as an external module.
Specifically, the dc adjustable load unit 3 includes at least one dc adjustable load, so that the calibration circuit for the dc power supply metering parameter can adjust the load power at any time according to the requirement, and the calibration requirement of the load adjustment rate item is met.
Referring to fig. 3, as a modification of the above scheme, the main control unit 5 includes: the buffer, the power amplifier, the first voltage amplifier, the second voltage amplifier, the third voltage amplifier, the fourth voltage amplifier, the fifth voltage amplifier, the first power source, and the first digital-to-analog converter further include a resistor and a capacitor as shown in fig. 3.
The power amplifier non inverting input end respectively with direct current signal sampling unit 2's output and ripple voltage measurement unit 1's output is connected, power amplifier inverting input end with power amplifier's output is connected, power amplifier's output with first voltage amplifier's inverting input end is connected, first voltage amplifier's non inverting input end ground connection, first voltage amplifier's output with second voltage amplifier's inverting input end is connected, second voltage amplifier's non inverting input end connect in second voltage amplifier's inverting input end with between first voltage amplifier's the output, second voltage amplifier's output and third voltage amplifier's non inverting input end are connected.
The input end of the buffer is connected with the first power supply, the output end of the buffer is connected with the non-inverting input end of the fourth voltage amplifier, the inverting input end of the fourth voltage amplifier is connected with the output end of the fourth voltage amplifier, and the output end of the fourth voltage amplifier is connected with the reference voltage input end of the first digital-to-analog converter.
The output end of the first digital-to-analog converter is respectively connected with the inverting input end of a fifth voltage amplifier and the non-inverting input end of a third voltage amplifier, the grounding end of the first digital-to-analog converter is grounded, the grounding end of the first digital-to-analog converter is also connected with the non-inverting input end of the fifth voltage amplifier, and the output end of the fifth voltage amplifier is connected between the output end of the first digital-to-analog converter and the inverting input end of the fifth voltage amplifier.
In this embodiment, fig. 3 is a specific implementation of the main control unit 5 of this embodiment. Due to the adoption of the connection mode, the main control unit 5 can receive signals of the direct current signal sampling unit 2 and the ripple voltage measuring unit 1, and can also control the alternating current voltage regulating unit 4 and the direct current adjustable load unit 3.
As a modification of the above, the ripple voltage measurement unit 1 includes: the circuit comprises a first current amplifier, a second current amplifier, a third current amplifier, a first analog-to-digital converter, a first analog switch and a direct current converter. In this embodiment, the resistor and the capacitor shown in fig. 4 are also included.
The non-inverting input end of the first current amplifier is connected with the direct current power supply measuring end, the inverting input end of the first current amplifier is connected with the output end of the first current amplifier, the output end of the first current amplifier is respectively connected with the output end of the second current amplifier and the output end of the first analog switch, and the input end of the first analog switch is connected with the second power supply.
The non-inverting input end of the second current amplifier is grounded, the output end of the second current amplifier is connected with the inverting input end of the third current amplifier, the non-inverting input end of the third current amplifier is grounded, the output end of the third current amplifier is connected with the first input end of the direct current converter, the first output end of the direct current converter is connected with the second input end of the direct current converter, the control input end of the direct current converter is connected between the first output end of the direct current converter and the second input end of the direct current converter, and the second output end of the direct current converter is connected with the first analog-to-digital converter.
In this embodiment, fig. 4 is a specific implementation of the ripple voltage measurement unit 1 of this embodiment. Due to the adoption of the connection mode, the ripple voltage measuring unit 1 realizes the measurement and calibration of the effective value of the ripple voltage.
As an improvement of the above aspect, the direct current measuring unit includes: the second voltage amplifier, the third voltage amplifier, the fourth voltage management chip and the second analog-to-digital converter. In this embodiment, the resistor and the capacitor shown in fig. 5 are also included.
The inverting input end of the sixth voltage amplifier is connected with the direct-current power supply measuring end, the non-inverting input end of the sixth voltage amplifier is grounded, the output end of the sixth voltage amplifier is connected with the second analog-to-digital converter and the input end of the first voltage management chip, and the synchronous control end of the first voltage management chip is connected with the direct-current voltage measuring unit.
The non-inverting input end of the seventh voltage amplifier is grounded, the inverting input end of the seventh voltage amplifier is connected between the output end of the sixth voltage amplifier and the input end of the first voltage management chip, and the output end of the seventh voltage amplifier is connected with the inverting input end of the seventh voltage amplifier.
In this embodiment, fig. 5 is a specific implementation of the dc current measuring unit of this embodiment. Due to the adoption of the connection mode, the direct current measuring unit realizes the functions of precise measurement and calibration of wide-range current.
As an improvement of the above aspect, the dc voltage measuring unit includes: the voltage regulator circuit comprises a first amplifier, a second analog switch, a third analog switch and a second voltage management chip, and in the embodiment, the voltage regulator circuit further comprises a resistor and a capacitor as shown in fig. 6.
The inverting input end of the first amplifier is connected with the direct current power supply measuring end, the non-inverting input end of the first amplifier is grounded, the output end of the first amplifier is connected with the inverting input end of the second amplifier, the non-inverting input end of the second amplifier is grounded, the output end of the second amplifier is connected with the input end of the second voltage management chip, and the synchronous control end of the second voltage management chip is connected with the direct current measuring unit.
A first input end of the second analog switch is connected with an inverting input end of the first amplifier, a first communication end of the second analog switch is connected with an output end of the first amplifier, and a second communication end of the second analog switch is connected with an output end of the first amplifier;
the first communication end of the third analog switch is connected between the second communication end of the second analog switch and the output end of the first amplifier, the second communication end of the third analog switch is connected with the output end of the second amplifier, and the input end of the third analog switch is connected between the output end of the first amplifier and the inverting input end of the second amplifier.
In this embodiment, fig. 6 is a specific implementation of the dc voltage measuring unit of this embodiment. Due to the adoption of the connection mode, the accurate output voltage measurement function and the short-term stability calculation analysis calibration function of the direct-current stabilized power supply are realized.
The embodiment of the utility model provides a still provide a calibration equipment of DC power supply measurement parameter, include: and the calibration circuit of the metering parameters of the direct-current power supply.
Compared with the prior art, the calibration equipment for the metering parameters of the direct-current power supply provided by the embodiment of the utility model adopts the calibration circuit for the metering parameters of the direct-current power supply, so that the calibration function is integrated in the same equipment, and the instrument is more convenient to carry; and manual alignment operation of the measuring instrument is avoided, so that the measuring result is more accurate, and the calibration efficiency is improved.
Various other equivalent changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should fall within the protective scope of the present invention.
Claims (10)
1. A calibration circuit for metering parameters of a DC power supply, comprising: the device comprises an alternating current voltage regulating output end, a direct current power supply measuring end, a direct current load input end, an alternating current voltage regulating unit for calibrating a voltage regulation rate, a direct current adjustable load unit for calibrating the load regulation rate, a direct current signal sampling unit for measuring direct current voltage and direct current, a ripple voltage measuring unit for measuring ripple voltage, and a main control unit for receiving the measured voltage regulation rate, the measured load regulation rate, the measured direct current voltage, the direct current and the ripple voltage and calibrating according to the voltage regulation rate and the load regulation rate;
the output end of the alternating current voltage regulating unit is connected with the alternating current voltage regulating output end, and the controlled end of the alternating current voltage regulating unit is connected with the control end of the main control unit;
the measuring end of the direct current signal sampling unit and the measuring end of the ripple voltage measuring unit are respectively connected with the measuring end of the direct current power supply; the output end of the direct current signal sampling unit and the output end of the ripple voltage measuring unit are respectively connected with the input end of the main control unit;
the input end of the direct current adjustable load unit is connected with the input end of the direct current load, and the controlled end of the direct current adjustable load unit is connected with the control end of the main control unit.
2. The calibration circuit for the metering parameters of the direct current power supply according to claim 1, wherein the direct current signal sampling unit comprises: the direct current measuring unit is used for measuring direct current;
the measuring end of the direct current voltage measuring unit and the measuring end of the direct current measuring unit are respectively connected with the measuring end of the direct current power supply, and the synchronous control end of the direct current voltage measuring unit is connected with the synchronous control end of the direct current measuring unit.
3. The calibration circuit for the metering parameters of a dc power supply of claim 1, wherein said circuit further comprises: a display unit;
the display unit is connected with the main control unit.
4. The calibration circuit for the metering parameters of a dc power supply of claim 1, wherein said circuit further comprises: a keyboard circuit;
the output end of the keyboard circuit is connected with the input end of the main control unit.
5. The calibration circuit for the metering parameters of the dc power supply according to claim 1, wherein the dc adjustable load unit comprises: at least one dc adjustable load.
6. The calibration circuit for the metering parameters of the direct current power supply according to claim 1, wherein the main control unit comprises: the power amplifier comprises a buffer, a power amplifier, a first voltage amplifier, a second voltage amplifier, a third voltage amplifier, a fourth voltage amplifier, a fifth voltage amplifier, a first power supply and a first digital-to-analog converter;
the non-inverting input end of the power amplifier is respectively connected with the output end of the direct current signal sampling unit and the output end of the ripple voltage measuring unit, the inverting input end of the power amplifier is connected with the output end of the power amplifier, the output end of the power amplifier is connected with the inverting input end of the first voltage amplifier, the non-inverting input end of the first voltage amplifier is grounded, the output end of the first voltage amplifier is connected with the inverting input end of the second voltage amplifier, the non-inverting input end of the second voltage amplifier is connected between the inverting input end of the second voltage amplifier and the output end of the first voltage amplifier, and the output end of the second voltage amplifier is connected with the non-inverting input end of a third voltage amplifier;
the input end of the buffer is connected with a first power supply, the output end of the buffer is connected with the non-inverting input end of a fourth voltage amplifier, the inverting input end of the fourth voltage amplifier is connected with the output end of the fourth voltage amplifier, and the output end of the fourth voltage amplifier is connected with the reference voltage input end of the first digital-to-analog converter;
the output end of the first digital-to-analog converter is respectively connected with the inverting input end of a fifth voltage amplifier and the non-inverting input end of a third voltage amplifier, the grounding end of the first digital-to-analog converter is grounded, the grounding end of the first digital-to-analog converter is also connected with the non-inverting input end of the fifth voltage amplifier, and the output end of the fifth voltage amplifier is connected between the output end of the first digital-to-analog converter and the inverting input end of the fifth voltage amplifier.
7. The calibration circuit for the metering parameters of the direct current power supply according to claim 1, wherein the ripple voltage measurement unit comprises: the device comprises a first current amplifier, a second current amplifier, a third current amplifier, a first analog-to-digital converter, a first analog switch and a direct current converter;
the non-inverting input end of the first current amplifier is connected with the direct-current power supply measuring end, the inverting input end of the first current amplifier is connected with the output end of the first current amplifier, the output end of the first current amplifier is respectively connected with the output end of the second current amplifier and the output end of the first analog switch, and the input end of the first analog switch is connected with the second power supply;
the non-inverting input end of the second current amplifier is grounded, the output end of the second current amplifier is connected with the inverting input end of the third current amplifier, the non-inverting input end of the third current amplifier is grounded, the output end of the third current amplifier is connected with the first input end of the direct current converter, the first output end of the direct current converter is connected with the second input end of the direct current converter, the control input end of the direct current converter is connected between the first output end of the direct current converter and the second input end of the direct current converter, and the second output end of the direct current converter is connected with the first analog-to-digital converter.
8. The calibration circuit for the metering parameters of the direct current power supply according to claim 2, wherein the direct current measurement unit comprises: the first voltage management chip comprises a sixth voltage amplifier, a seventh voltage amplifier, a first voltage management chip and a second analog-to-digital converter;
the inverting input end of the sixth voltage amplifier is connected with the direct-current power supply measuring end, the non-inverting input end of the sixth voltage amplifier is grounded, the output end of the sixth voltage amplifier is connected with the second analog-to-digital converter and the input end of the first voltage management chip, and the synchronous control end of the first voltage management chip is connected with the direct-current voltage measuring unit;
the non-inverting input end of the seventh voltage amplifier is grounded, the inverting input end of the seventh voltage amplifier is connected between the output end of the sixth voltage amplifier and the input end of the first voltage management chip, and the output end of the seventh voltage amplifier is connected with the inverting input end of the seventh voltage amplifier.
9. The calibration circuit for the metering parameters of the direct current power supply according to claim 2, wherein the direct current voltage measurement unit comprises: the first amplifier, the second analog switch, the third analog switch and the second voltage management chip;
the inverting input end of the first amplifier is connected with the direct-current power supply measuring end, the non-inverting input end of the first amplifier is grounded, the output end of the first amplifier is connected with the inverting input end of the second amplifier, the non-inverting input end of the second amplifier is grounded, the output end of the second amplifier is connected with the input end of the second voltage management chip, and the synchronous control end of the second voltage management chip is connected with the direct-current measuring unit;
a first input end of the second analog switch is connected with an inverting input end of the first amplifier, a first communication end of the second analog switch is connected with an output end of the first amplifier, and a second communication end of the second analog switch is connected with an output end of the first amplifier;
the first communication end of the third analog switch is connected between the second communication end of the second analog switch and the output end of the first amplifier, the second communication end of the third analog switch is connected with the output end of the second amplifier, and the input end of the third analog switch is connected between the output end of the first amplifier and the inverting input end of the second amplifier.
10. A calibration device for dc power supply metering parameters, characterized by comprising a calibration circuit for dc power supply metering parameters according to any one of claims 1 to 9.
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| CN201921974135.2U CN211698120U (en) | 2019-11-14 | 2019-11-14 | Calibration circuit and equipment for direct-current power supply metering parameters |
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| CN201921974135.2U CN211698120U (en) | 2019-11-14 | 2019-11-14 | Calibration circuit and equipment for direct-current power supply metering parameters |
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