CN211123236U - Novel current and voltage load box test system - Google Patents
Novel current and voltage load box test system Download PDFInfo
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- CN211123236U CN211123236U CN201921616665.XU CN201921616665U CN211123236U CN 211123236 U CN211123236 U CN 211123236U CN 201921616665 U CN201921616665 U CN 201921616665U CN 211123236 U CN211123236 U CN 211123236U
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a novel current-voltage load box test system, which comprises a direct current power supply, an alternating current power supply, a tested object, a power supply selection unit, a current sampling circuit, a voltage sampling circuit, a low-pass filter circuit unit, an AD analog-to-digital conversion circuit and a main CPU, wherein the AD analog-to-digital conversion circuit is used for converting analog signals behind the low-pass filter circuit unit into digital signals; and after the internal processing of the CPU, displaying the test result through a display terminal. The load box test system can accurately test the resistance and inductance values of the current load box and the voltage load box, and the adverse effect in the traditional method is avoided, so that the stability of test precision is improved. Meanwhile, the current load box and the voltage load box under different frequencies can be tested, the system stability is higher, the use is more convenient, and the test effect is better.
Description
Technical Field
The utility model relates to a novel load box tests technical field, concretely relates to novel current-voltage load box test system.
Background
At present, the test calibration of current load boxes and voltage load boxes in the market is 'JJF 1264-2010 transformer load box calibration specification', the basic principle of which is that power frequency voltage or current is loaded on the voltage load boxes and the current load boxes respectively, R and L are calculated respectively in a z = u/i mode, and the mode is influenced by the power factor of the load boxes, the test precision of instruments and the tested load boxes R L.
Disclosure of Invention
In order to solve the existing problem, the utility model provides a novel current-voltage load box test system.
The utility model discloses a realize through following technical scheme:
a novel current and voltage load box test system, the load box test system comprises:
the direct current power supply is a 1A direct power supply or a 10mA direct power supply;
the alternating current power supply can be selected from a 50HZ alternating current power supply, a 60HZ alternating current power supply or a 400HZ alternating current power supply;
the device comprises a tested article, a power supply and a control circuit, wherein the tested article can be a current load box or a voltage load box;
the power supply selection unit selects one power supply to output according to the tested article;
the current sampling circuit and the voltage sampling circuit are mainly used for sampling a current parameter value and a voltage parameter value of a tested object;
the low-pass filter circuit unit is used for filtering high-pass signals of the current sampling circuit and the voltage sampling circuit and allowing the low-pass signals to pass;
the AD analog-to-digital conversion circuit is used for converting the analog signals after the low-pass filter circuit unit into digital signals;
the main CPU is mainly used for processing the numerical value output by the AD analog-to-digital conversion circuit through the CPU and displaying the test result through a display terminal;
further, the tested object is selected as a current load box, and the power supply selection unit selects a direct-current power supply; the tested object is selected to be a voltage load box, and the power supply selection unit selects an alternating current power supply.
Furthermore, the power selection unit is connected with a current sampling circuit and a tested object in series, the tested object is connected with a switch and a resistor in parallel, the switch is normally in a normally open state, the other end of the tested object is connected with a voltage sampling circuit in parallel, the current sampling circuit and the voltage sampling circuit are connected to the low-pass filter circuit unit respectively, and meanwhile, the digital signal is processed through the main CPU inside through the AD analog-to-digital conversion circuit, and then the test result is displayed on an external terminal.
Furthermore, the abnormal information read by the main CPU is used for suspending the direct current power supply or the alternating current power supply at any time through the emergency switch.
Furthermore, when the tested object is tested by changing the current load box into the voltage load box, the switch is firstly switched on and discharged, then the switch is switched off, and the power supply selection unit selects the alternating current power supply.
Compared with the prior art, the beneficial effects of the utility model are that: the load box test system can accurately test the resistance inductance values of the current load box and the voltage load box, and the adverse effect in the traditional method is avoided, so that the test precision stability is improved. Meanwhile, the current load box and the voltage load box under different frequencies can be tested, the system stability is higher, the use is more convenient, and the test effect is better.
Drawings
Fig. 1 is a diagram of a novel current-voltage load box test system.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
as shown in fig. 1, a novel current-voltage load box test system includes:
the direct current power supply is a 1A direct power supply or a 10mA direct power supply;
the alternating current power supply can be selected from a 50HZ alternating current power supply, a 60HZ alternating current power supply or a 400HZ alternating current power supply, and the alternating current power supplies with different Hertz are selected according to the standards of different countries;
the tested object can be a current load box or a voltage load box;
the power supply selection unit selects one power supply to output according to the tested article;
the current sampling circuit and the voltage sampling circuit are mainly used for sampling a current parameter value and a voltage parameter value of a tested object;
the low-pass filter circuit unit is used for filtering high-pass signals of the current sampling circuit and the voltage sampling circuit and allowing the low-pass signals to pass;
the AD analog-to-digital conversion circuit is used for converting the analog signals after the low-pass filter circuit unit into digital signals;
the main CPU is mainly used for processing the numerical value output by the AD analog-to-digital conversion circuit through the CPU and displaying the test result through a display terminal;
the tested object is selected as a current load box, and the power supply selection unit selects a direct-current power supply; the tested object is selected to be a voltage load box, and the power supply selection unit selects an alternating current power supply.
The power selection unit is connected with a current sampling circuit and a tested object in series, the tested object is connected with a switch and a resistor in parallel, the switch is normally in a normally open state, the other end of the tested object is connected to a voltage sampling circuit in parallel, the current sampling circuit and the voltage sampling circuit are connected to a low-pass filter circuit unit respectively, meanwhile, the AD analog-to-digital conversion circuit is used for displaying a test result to an external terminal after digital signals are processed through the main CPU.
The main CPU judges the abnormal information and then suspends the DC power supply or the AC power supply at any time through the emergency switch.
When the tested object is tested by changing the current load box into the voltage load box, the switch is firstly switched on and discharged, then the switch is switched off, and the power supply selection unit selects the alternating current power supply.
The present invention will be further explained with reference to the tested article.
Selective current load box
Firstly, entering an instrument software interface to select a test object as a current load box;
secondly, the power supply selection unit is switched to a direct power supply 1A by an internal relay of the instrument for output;
thirdly, testing the Udc by a sampling circuit board, sampling 128 data, and then performing software filtering processing to obtain Rdc = Udc/1;
and fourthly, closing the switch, merging the switch into the discharge resistor and fully discharging.
Fifthly, the adjustable alternating current source is switched to an output alternating current source by an internal relay of the instrument to be output;
sixthly, the voltage and current signals enter a low-pass filter and enter a sampling circuit
And seventhly, the current and voltage sampling circuit samples the voltage and the current at 128 points respectively, calculates an effective value by an integration method, and performs digital filtering to obtain the amplitudes of U and I. Z = U/I, yielding Z. And by X = sqrt (Z + Z-Rdc + Rdc).
And eighthly, cutting off the power supply output, and displaying the result in R X size on the external display terminal.
Load box for selecting voltage
Firstly, entering an instrument software interface to select a test object as a voltage load box
Secondly, adjusting the direct current power supply to be switched to the output of 1mA of the constant current source by an internal relay of the instrument
And thirdly, testing the Udc by a sampling circuit board, sampling 128 data, and then performing software filtering processing to obtain the Rdc = Udc/1 × 1000.
And fourthly, closing the switch, merging the switch into the discharge resistor and fully discharging.
Fifthly, the adjustable alternating current source is switched to output alternating current source output by the relay inside the instrument
Sixthly, a voltage current signal result low-pass filter enters a sampling circuit
And seventhly, the voltage and current sampling circuit samples the voltage and the current at 128 points respectively, calculates an effective value by an integration method, and performs digital filtering to obtain the amplitudes of U and I. Z = U/I, yielding Z. And by X = sqrt (Z + Z-Rdc + Rdc).
And eighthly, cutting off the power supply output, and displaying the result in R X size on the external display terminal.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a novel current-voltage load box test system which characterized in that, this load box test system includes:
the direct current power supply is a 1A direct power supply or a 10mA direct power supply;
the alternating current power supply can be selected from a 50HZ alternating current power supply, a 60HZ alternating current power supply or a 400HZ alternating current power supply;
the device comprises a tested article, a power supply and a control circuit, wherein the tested article can be a current load box or a voltage load box;
the power supply selection unit selects one power supply to output according to the tested article;
the current sampling circuit and the voltage sampling circuit are mainly used for sampling a current parameter value and a voltage parameter value of a tested object;
the low-pass filter circuit unit is used for filtering high-pass signals of the current sampling circuit and the voltage sampling circuit and allowing low-frequency signals to pass;
the AD analog-to-digital conversion circuit is used for converting the analog signal after the low-pass filter circuit unit into a digital signal;
the main CPU is used for processing the numerical value output by the AD analog-to-digital conversion circuit through the CPU and displaying the test result through a display terminal.
2. The novel current-voltage load box test system of claim 1, wherein: the tested object is selected as a current load box, and the power supply selection unit selects a direct-current power supply; the tested object is selected to be a voltage load box, and the power supply selection unit selects an alternating current power supply.
3. The novel current-voltage load box test system of claim 1, wherein: the power selection unit is connected with a current sampling circuit and a tested object in series, the tested object is connected with a switch and a resistor in parallel, the switch is normally in a normally open state, the other end of the tested object is connected with a voltage sampling circuit in parallel, the current sampling circuit and the voltage sampling circuit are connected to a low-pass filter circuit unit respectively, meanwhile, the AD analog-to-digital conversion circuit is used for displaying a test result to an external terminal after digital signals are processed through the main CPU.
4. The novel current-voltage load box test system of claim 1, wherein: the main CPU judges the abnormal information and then suspends the direct current power supply or the alternating current power supply at any time through the emergency switch.
5. The novel current-voltage load box test system of claim 1, wherein: when the tested object is tested by changing the current load box into the voltage load box, the switch is firstly switched on and then switched off, and the power supply selection unit selects the alternating current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921616665.XU CN211123236U (en) | 2019-09-26 | 2019-09-26 | Novel current and voltage load box test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921616665.XU CN211123236U (en) | 2019-09-26 | 2019-09-26 | Novel current and voltage load box test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211123236U true CN211123236U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921616665.XU Expired - Fee Related CN211123236U (en) | 2019-09-26 | 2019-09-26 | Novel current and voltage load box test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211123236U (en) |
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2019
- 2019-09-26 CN CN201921616665.XU patent/CN211123236U/en not_active Expired - Fee Related
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Granted publication date: 20200728 |