CN203773034U - Testing device of direct-current ripple system - Google Patents
Testing device of direct-current ripple system Download PDFInfo
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- CN203773034U CN203773034U CN201320722889.5U CN201320722889U CN203773034U CN 203773034 U CN203773034 U CN 203773034U CN 201320722889 U CN201320722889 U CN 201320722889U CN 203773034 U CN203773034 U CN 203773034U
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Abstract
The utility model relates to a testing device of a direct-current ripple system. The testing device comprises a host machine and a current sensor. The hose machine is equipped with a liquid crystal screen and four buttons. The host machine is provided with a voltage bias circuit, an AD sampling circuit, a direct-current voltage division circuit, a blocking circuit, a voltage-division filter circuit, an effective value sampling circuit, a peak-to-peak value high-speed sampling circuit, and a processor. The current sensor converts tested current signals into voltage signals. Positive current is converted into the positive voltage signal while negative current is converted into the negative voltage signal. The converted positive and negative voltage signals are converted through the voltage bias circuit into a positive voltage signal which is identifiable to the AD sampling circuit and is inputted into a first channel of a 24-bit high-precision sampling chip ADS1232. The ADS1232 converts a digital analog signal into a digital signal, and then uploads the digital signal to the processor. The processor measures the voltage stabilization precision, current stabilization precision, and ripple coefficient of a direct-current power supply in the direct-current system according to the digital signal, and the voltage stabilization precision, current stabilization precision, and ripple coefficient are displayed through the liquid crystal screen.
Description
Technical field
The utility model relates to electric power checkout equipment field, specifically a kind of DC ripple opening machine system test device.
Background technology
In recent years, a large amount of employings of valve-regulated battery, have higher requirement to the performance of charging set.Portion of former State Grid has just formulated relevant control criterion, and the charging set precision of voltage regulation, precision of steady current, ripple factor are proposed to clear and definite requirement.To be often that ripple factor is excessive cause in the damage of battery, and charging set is long-term in service, and its ripple factor total amount changes.In order to measure the precision of voltage regulation of direct supply in straight-flow system, precision of steady current and ripple factor, we have developed this product.
Summary of the invention
The purpose of this utility model is for above-mentioned existing problems and deficiency, and a kind of DC ripple opening machine system test device of measuring the precision of voltage regulation, precision of steady current and the ripple factor of direct supply in straight-flow system is provided.
The technical solution of the utility model is achieved in that a kind of DC ripple opening machine system test device, comprise main frame and current sensor, described main frame is equipped with 2.8 inches of liquid crystal displays and 4 buttons, in main frame, be provided with voltage offset electric circuit, AD sample circuit, DC voltage divider circuit, block isolating circuit, pressure filter circuit, effective value sample circuit, peak-to-peak value high-speed sampling circuit and processor, described current sensor is converted into voltage signal by tested current signal, positive current is converted into positive voltage signal, negative current is converted into negative voltage signal, the positive/negative voltage signal transforming is out converted into the discernible positive voltage signal of AD sample circuit by voltage offset electric circuit, be input to first passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, be uploaded to processor,
When tested voltage is DC voltage, but while wherein containing Alternating Component, the DC component in tested voltage, after DC voltage divider circuit, is input to second passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, is uploaded to processor; AC compounent in tested voltage extracts through block isolating circuit, minute two-way output after pressure filter circuit, ADS1232 effective value sample circuit is exported on one tunnel, peak-to-peak value high-speed sampling circuit is exported on one tunnel, be uploaded to processor, processor is measured the precision of voltage regulation, precision of steady current and the ripple factor of direct supply in straight-flow system and shows by liquid crystal display according to digital signal again.
Further, described ADS1232 sample circuit inside is with low-noise programmable precision amplifier, accurate Delta-Sigma AD converter and built-in oscillator.Have low-down noise, in the time of PGA=128 times, only have 17nVrms effective noise in the input range of 20mV, sampling rate is 10Hz and 80Hz, for 50Hz and 60Hz, has the inhibition ability that is greater than 100dB.
Further, described main frame is also provided with data storage socket, supports serial ports, USB flash disk to derive Excel file, adopts I2C bus protocol, autostore parameters last time.
The utility model AD736 effective value sample circuit, its principal feature is that accuracy is high, sensitivity good, measure that speed is fast, frequency characteristic good (operating frequency range can reach 0～460kHz), input impedance is high, output impedance is low, power range is wide and the power work electric current of maximum low in energy consumption is 200 μ A, with the composition error that it measures sine voltage be no more than ± 3%.
Principle of the present utility model is as follows:
The precision of voltage regulation is defined:
Charging device is under voltage stabilizing state, and VD is set as any point in specialized range, and AC-input voltage changes in (85%-115%) ratings, and adjusting load current is 0-100% ratings, measures respectively the output voltage of its charging device.Find out the ultimate value Um of charging device output voltage in above-mentioned variation range.
The precision of voltage regulation is defined as:
δU= [（UM-UZ）÷ Uz]×100%
In formula:
δ U-precision of voltage regulation;
When UZ-AC-input voltage is ratings and the load current rated current that is 50%, output voltage measured value;
The ultimate value of UM-output voltage.
Precision of steady current is defined as:
Charging device is under constant-current charge state, charging current is set any point in the setting range of stipulating, AC-input voltage changes in (85%-115%) ratings, adjust charging voltage changes in the variation range of regulation, measure respectively charging current, find out the ultimate value Im of charging current in above-mentioned variation range.
Precision of steady current is defined as:
δI= [（Im-Iz）÷ Iz]×100%
In formula:
δ I-precision of steady current;
When Iz-AC-input voltage is intermediate value in setting range of ratings and charging voltage, charging current measured value;
The ultimate value of Im-charging current.
Ripple factor: ripple effective value coefficient and ripple peak-to-peak value coefficient general designation ripple factor;
Ripple effective value: AC compounent effective value voltage in the current output dc voltage of charging module;
Ripple effective value coefficient: the root mean square of pulsation effective value coefficient content and the absolute value of DC component it
Ratio;
Ripple peak-to-peak value: between the percent ripple peak valley in the current output dc voltage of charging module in AC compounent
Voltage;
Ripple peak-to-peak value coefficient: between percent ripple ripple peak valley, difference (comprising noise) is absolute with DC component
The ratio of value;
Calculate ripple effective value coefficient and ripple value coefficient:
: ripple effective value coefficient
: ripple peak-to-peak value coefficient
: output voltage AC compounent effective value
: output voltage AC compounent peak-to-peak value
: VD mean value
The major function of the utility model DC ripple opening machine system test device:
1, precision of voltage regulation test function, device can be tested the precision of voltage regulation of straight source voltage, shows in real time voltage waveform and the numerical value of tested direct supply in test process, records display measurement value, show test maximal value and minimum value simultaneously, calculate and show the precision of voltage regulation;
2, precision of steady current test function, device can detect the precision of steady current of direct supply, shows in real time current waveform profile and the numerical value of tested direct supply in testing process, records display measurement value, show test maximal value and minimum value simultaneously, calculate and show precision of steady current;
3, ripple factor test function, device can be measured the ripple factor of direct supply, comprises ripple effective value coefficient and ripple peak-to-peak value coefficient.In measuring process, with peak-mode, show in real time ripple squiggle figure, ripple peak-to-peak value size and coefficient, ripple effective value size and coefficient, DC voltage value.
4, data storage and look facility, can press memory function key and store current test data in test process, can check historical test data record, can delete wall scroll or whole group of historical record.
Below in conjunction with accompanying drawing, the utility model is further described.
accompanying drawing explanationfig. 1 is the utility model hardware structure block diagram.
Embodiment
As shown in Figure 1, the utility model is the hardware structure block diagram of DC ripple opening machine system test device, comprise main frame and current sensor, main frame is equipped with 2.8 inches of liquid crystal displays and 4 buttons, in main frame, be provided with voltage offset electric circuit, AD sample circuit, DC voltage divider circuit, block isolating circuit, pressure filter circuit, effective value sample circuit, peak-to-peak value high-speed sampling circuit and processor, current sensor is converted into voltage signal by tested current signal, positive current is converted into positive voltage signal, negative current is converted into negative voltage signal, the positive/negative voltage signal transforming is out converted into the discernible positive voltage signal of AD sample circuit by voltage offset electric circuit, be input to first passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, be uploaded to processor.
When tested voltage is DC voltage, but while wherein containing Alternating Component, the DC component in tested voltage, after DC voltage divider circuit, is input to second passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, is uploaded to processor; AC compounent in tested voltage extracts through block isolating circuit, minute two-way output after pressure filter circuit, ADS1232 effective value sample circuit is exported on one tunnel, peak-to-peak value high-speed sampling circuit is exported on one tunnel, be uploaded to processor, processor is measured the precision of voltage regulation, precision of steady current and the ripple factor of direct supply in straight-flow system and shows by liquid crystal display according to digital signal again.
Described ADS1232 sample circuit inside is with low-noise programmable precision amplifier, accurate Delta-Sigma AD converter and built-in oscillator.Have low-down noise, in the time of PGA=128 times, only have 17nVrms effective noise in the input range of 20mV, sampling rate is 10Hz and 80Hz, for 50Hz and 60Hz, has the inhibition ability that is greater than 100dB.
Main frame is also provided with data storage socket, supports USB flash disk to derive Excel file, adopts I2C bus protocol, autostore parameters last time.AD736 effective value sample circuit, its principal feature is that accuracy is high, sensitivity good, measure that speed is fast, frequency characteristic good (operating frequency range can reach 0～460kHz), input impedance is high, output impedance is low, power range is wide and the power work electric current of maximum low in energy consumption is 200 μ A, with the composition error that it measures sine voltage be no more than ± 3%.
Described MCU processor adopting STM32 series.The ARM Cortex-M3 kernel of 32 digit flash memory microcontrollers based on breakthrough, has improved again the Thumb-2 instruction set of code density when rising performance, the interrupt response increasing substantially, and also all new functions all have the power consumption levels of industry optimum simultaneously.
The utility model technical requirement: working power: AC220 ± 15V
| Project | Measurement range | Resolution | Precision |
| DC voltage | 0-300V | 0.01V | <0.1% |
| DC current | 0-100A | 0.01A | <1% |
| Ripple crest voltage | 0-20V | 0.1V | <2% |
| Ripple effective value voltage | 0-10V | 0.1V | <1% |
DC voltage waveform curve: transverse axis 256 points, 1 point/50 millisecond, the longitudinal axis 120 points, 0.1V/ point
DC current squiggle: transverse axis 256 points, 1 point/50 millisecond, the longitudinal axis 120 points, 0.05A/ point
Ripple peak value squiggle: transverse axis 256 points, 1 point/50 millisecond, the longitudinal axis 120 points, 0.1V/ point
500 groups of data storage sets numbers.
DC voltage and electric current adopt independently 24 AD to sample, and ripple effective value is completed by the inner ADC of processor after effective value IC conversion, and ripple peak value sampling circuit is entered processor inner high speed AD sample circuit after high-pass filtering circuit by direct supply.
In this hardware circuit, design 4 buttons, be defined as respectively " confirmation " " on " D score " returns to " four functions.In this hardware circuit, design 4 pilot lamp, be defined as respectively " power supply " " work " " normally " " fault " one of four states.Four keypress function specifications: enter corresponding function items by acknowledgement key on main interface; At arbitrary interface, by return key, return to main interface; Switching that can practical function by upper and lower key, can realize look facility one by one at historical record query interface.In historical record interface length, by acknowledgement key, can realize the record of wall scroll or all Records of the Historians and delete and select prompting frame, reaffirm that key can realize corresponding delete function.
This tester comprises four major function items altogether, five main interfaces, consists of, and comprises main interface, precision of voltage regulation test interface, precision of steady current test interface, ripple factor test interface, historgraphic data recording interface.
According to the definition of the precision of voltage regulation, carry out when the precision of voltage regulation is measured first gathering the reference value that a direct current voltage measuring value is measured as the precision of voltage regulation.Start the front sampling that completes measured value for 5 seconds after this function, do not carry out waveform tracing, the 6th second starts recording voltage waveform, and voltage waveform is point centered by measured value, and maximal value and minimum value are compared for estimating voltage and measured value in process.Real-time update current voltage displayed value, maximal value, minimum value and precision of voltage regulation value in this project testing process.The test precision of voltage regulation is greater than 0.5% rear normal pilot lamp and goes out, and malfunction indicator lamp is bright.
Precision of steady current is consistent with the precision of voltage regulation, and test precision of steady current is greater than 1% rear normal pilot lamp and goes out, and malfunction indicator lamp is bright.
Ripple factor test comprises ripple peak factor and ripple effective value coefficient.Describing of ripple peak value waveform, adopts follow-on test to calculate peak-mode, and sampling described point is synchronizeed and carried out with calculating, and the rear peak-to-peak value that calculates of continuous sampling point that often completes 10ms carries out described point, and counting that 10ms sampling comprises determined according to sampling rate.When carrying out peak value sampling described point, read DC voltage and ripple effective value voltage, calculate ripple effective value coefficient and ripple peak factor real-time update.(1-3s update time).It is bright that ripple peak factor surpasses 1% rear trouble light, and it is bright that ripple effective value coefficient surpasses 0.5% rear trouble light.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (1)
1. a DC ripple opening machine system test device, is characterized in that: comprise main frame and current sensor,
Described main frame is equipped with 2.8 inches of liquid crystal displays and button, in main frame, be provided with voltage offset electric circuit, AD sample circuit, DC voltage divider circuit, block isolating circuit, pressure filter circuit, effective value sample circuit, peak-to-peak value high-speed sampling circuit and processor, described current sensor is converted into voltage signal by tested current signal, positive current is converted into positive voltage signal, negative current is converted into negative voltage signal, the positive/negative voltage signal transforming is out converted into the discernible positive voltage signal of AD sample circuit by voltage offset electric circuit, be input to first passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, be uploaded to processor,
When tested voltage is DC voltage, but while wherein containing Alternating Component, the DC component in tested voltage, after DC voltage divider circuit, is input to second passage of 24 sampling with high precision chip ADS1232, ADS1232 is converted into simulating signal after digital signal, is uploaded to processor; AC compounent in tested voltage extracts through block isolating circuit, minute two-way output after pressure filter circuit, ADS1232 effective value sample circuit is exported on one tunnel, peak-to-peak value high-speed sampling circuit is exported on one tunnel, be uploaded to processor, processor is measured the precision of voltage regulation, precision of steady current and the ripple factor of direct supply in straight-flow system and shows by liquid crystal display according to digital signal again;
Described ADS1232 sample circuit inside is with low-noise programmable precision amplifier, accurate Delta-Sigma AD converter and built-in oscillator;
Described main frame is also provided with data storage socket and supports serial ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320722889.5U CN203773034U (en) | 2013-11-15 | 2013-11-15 | Testing device of direct-current ripple system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320722889.5U CN203773034U (en) | 2013-11-15 | 2013-11-15 | Testing device of direct-current ripple system |
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| Publication Number | Publication Date |
|---|---|
| CN203773034U true CN203773034U (en) | 2014-08-13 |
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|---|---|---|---|
| CN201320722889.5U Expired - Fee Related CN203773034U (en) | 2013-11-15 | 2013-11-15 | Testing device of direct-current ripple system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865430A (en) * | 2015-05-28 | 2015-08-26 | 武汉精测电子技术股份有限公司 | Automatic ripple testing device and method |
| CN107015167A (en) * | 2016-12-30 | 2017-08-04 | 国网天津市电力公司 | A kind of Switching Power Supply ripple voltage detection method based on detection techniques |
| CN108132444A (en) * | 2017-12-20 | 2018-06-08 | 广州勤正电力科技有限公司 | Direct current ripple coefficient test device |
| CN108828337A (en) * | 2018-06-16 | 2018-11-16 | 桂林电子科技大学 | Ripple noise test device |
| CN110441711A (en) * | 2019-09-19 | 2019-11-12 | 扬州万泰电子科技有限公司 | A kind of WEDM control system processing power source test device |
| CN113834965A (en) * | 2021-09-15 | 2021-12-24 | 广东电网有限责任公司 | Ripple voltage measuring device and method |
-
2013
- 2013-11-15 CN CN201320722889.5U patent/CN203773034U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865430A (en) * | 2015-05-28 | 2015-08-26 | 武汉精测电子技术股份有限公司 | Automatic ripple testing device and method |
| CN104865430B (en) * | 2015-05-28 | 2019-01-01 | 武汉精测电子集团股份有限公司 | A kind of device and method of automatic test ripple |
| CN107015167A (en) * | 2016-12-30 | 2017-08-04 | 国网天津市电力公司 | A kind of Switching Power Supply ripple voltage detection method based on detection techniques |
| CN107015167B (en) * | 2016-12-30 | 2020-01-07 | 国网天津市电力公司 | Detection technology-based switching power supply ripple voltage detection method |
| CN108132444A (en) * | 2017-12-20 | 2018-06-08 | 广州勤正电力科技有限公司 | Direct current ripple coefficient test device |
| CN108828337A (en) * | 2018-06-16 | 2018-11-16 | 桂林电子科技大学 | Ripple noise test device |
| CN110441711A (en) * | 2019-09-19 | 2019-11-12 | 扬州万泰电子科技有限公司 | A kind of WEDM control system processing power source test device |
| CN110441711B (en) * | 2019-09-19 | 2024-03-08 | 扬州万泰电子科技有限公司 | Power supply testing device of wire cutting control system |
| CN113834965A (en) * | 2021-09-15 | 2021-12-24 | 广东电网有限责任公司 | Ripple voltage measuring device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20171115 |