CN213581812U - AC/DC signal parameter intelligent detection device - Google Patents
AC/DC signal parameter intelligent detection device Download PDFInfo
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- CN213581812U CN213581812U CN202023125144.XU CN202023125144U CN213581812U CN 213581812 U CN213581812 U CN 213581812U CN 202023125144 U CN202023125144 U CN 202023125144U CN 213581812 U CN213581812 U CN 213581812U
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Abstract
The utility model relates to an AC/DC signal parameter intelligent detection device, which comprises an amplitude tracking circuit, a range selection circuit, a zero-crossing comparison circuit, a control chip circuit, a power module circuit and a display screen; the amplitude tracking circuit is connected with the range selection circuit and used for converting one path of signal of the signal to be detected into a level signal with the same amplitude as that of the signal to be detected through the amplitude tracking circuit and then outputting the level signal through the range selection circuit; the range selection circuit is connected with the control chip circuit and used for carrying out A/D conversion on the output signal and obtaining the amplitude of the signal to be detected; the zero-crossing comparison circuit is connected with the control chip circuit and used for outputting a pulse signal to the other path of the signal to be detected through the zero-crossing comparator circuit, measuring the frequency of the output pulse signal through the control chip circuit, and judging whether the signal is a direct current signal or an alternating current signal according to the frequency value and displaying the signal type, amplitude and frequency obtained through the display screen. The utility model discloses can accurately show kind, amplitude and the frequency of surveying the signal.
Description
Technical Field
The utility model relates to the field of electronic technology, especially an alternating current-direct current signal parameter intellectual detection system device.
Background
The amplitude and frequency of the ac signal and the magnitude of the dc voltage are important parameters in electronics, and these parameters need to be measured in many measurement fields. At present, common equipment for measuring parameters of alternating current and direct current signals is provided with a multimeter and an oscilloscope, but the multimeter cannot measure the frequency of alternating current signals and the amplitude of high-frequency signals, and the measuring range needs to be manually switched. Oscilloscopes are generally expensive, complex to operate, large in size, heavy in weight and inconvenient to use. The existing other measurement schemes can only realize the detection of the parameters of alternating current low-frequency signals (less than 20 kHz), have single function, also need human intervention (adjusting related potentiometers) during measurement, and have complex circuits and low measurement precision.
The existing device for measuring the parameters of the alternating current and direct current signals has the problems of single function, complex operation, high price and low measurement precision.
Disclosure of Invention
In view of this, the utility model aims at providing an alternating current-direct current signal parameter intellectual detection system device need not to carry out any operation during the measurement, can automatic identification alternating current-direct current signal to show kind (direct current or exchange), amplitude and the frequency of signal measured fast, accurately.
The utility model discloses a following scheme realizes: an AC/DC signal parameter intelligent detection device comprises an amplitude tracking circuit, a range selection circuit, a zero-crossing comparison circuit, a control chip circuit, a power module circuit and a display screen; the amplitude tracking circuit is connected with the range selection circuit and used for converting one path of signals of the signals to be detected into level signals with the same amplitude as the signals to be detected through the amplitude tracking circuit and then outputting the level signals through the range selection circuit; the range selection circuit is connected with the control chip circuit and used for carrying out A/D conversion on the output signal and obtaining the amplitude of the signal to be detected; the zero-crossing comparison circuit is connected with the control chip circuit and used for outputting a pulse signal to the other path of the signal to be detected through the zero-crossing comparator circuit, measuring the frequency of the output pulse signal through the control chip circuit and judging whether the signal is a direct current signal or an alternating current signal according to the frequency value; the control chip circuit is also connected with the display screen and used for displaying the obtained signal type, amplitude and frequency; the power module circuit is respectively connected with the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen and is used for providing electric energy for the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen.
Further, the range selection circuit comprises a three-way voltage division circuit and an analog electronic switch circuit; the analog electronic switch circuit is connected with the control chip circuit; the three voltage division circuits are respectively connected with the amplitude tracking circuit and the analog electronic switch circuit and are used for carrying out trisection voltage division on the voltage output by the amplitude tracking circuit, the three voltages are transmitted to the analog electronic switch circuit for selection, and one of the three voltages is selected and then transmitted to the control chip circuit.
Further, the control chip adopted by the control chip circuit is a single chip microcomputer, and the model of the single chip microcomputer is ATMEGA 16.
Further, the model of the display screen is an LCD 1602.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses need not to carry out any operation during the measurement, ability automatic identification alternating current-direct current signal to show the kind (direct current or exchange), amplitude and the frequency of surveying the signal fast, accurately.
Drawings
Fig. 1 is a diagram illustrating an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the signal conversion to be measured according to the embodiment of the present invention.
Fig. 3 is a minimum system diagram of the single chip microcomputer according to the embodiment of the present invention.
Fig. 4 is a circuit diagram of an LCD according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a power module according to an embodiment of the present invention.
Fig. 6 is a flowchart of a range switching subroutine according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a circuit of the device according to the embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 1 and 7, the present embodiment provides an intelligent detection apparatus for parameters of ac/dc signals, which includes an amplitude tracking circuit, a range selection circuit, a zero-crossing comparison circuit, a control chip circuit, a power module circuit, and a display screen; the amplitude tracking circuit is connected with the range selection circuit and used for converting one path of signals of the signals to be detected into level signals with the same amplitude as the signals to be detected through the amplitude tracking circuit and then outputting the level signals through the range selection circuit; the range selection circuit is connected with the control chip circuit and used for carrying out A/D conversion on the output signal and obtaining the amplitude of the signal to be detected; the zero-crossing comparison circuit is connected with the control chip circuit and used for outputting a pulse signal to the other path of the signal to be detected through the zero-crossing comparator circuit, measuring the frequency of the output pulse signal through the control chip circuit and judging whether the signal is a direct current signal or an alternating current signal according to the frequency value; the control chip circuit is also connected with the display screen and used for displaying the obtained signal type, amplitude and frequency; the power module circuit is respectively connected with the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen and is used for providing electric energy for the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen.
In this embodiment, the range selection circuit includes a three-way voltage divider circuit and an analog electronic switch circuit; the analog electronic switch circuit is connected with the control chip circuit; the three voltage division circuits are respectively connected with the amplitude tracking circuit and the analog electronic switch circuit and are used for carrying out trisection voltage division (three-way output) on the voltage output by the amplitude tracking circuit, and the three voltages are transmitted to the analog electronic switch circuit for selection (one of the three voltages is selected) and then transmitted to the control chip circuit.
In this embodiment, the control chip used by the control chip circuit is a single chip microcomputer, and the model is ATMEGA 16.
In this embodiment, the display screen is of the type LCD 1602.
Preferably, the device designed in this embodiment divides the signal to be detected into two paths, as shown in fig. 2, one path is used to detect the amplitude of the signal, i.e. the signal is first converted into a level signal with the same magnitude as the amplitude of the signal to be detected by the amplitude tracking circuit, and then output by the range selection circuit (including the three-path voltage division circuit and the analog electronic switch circuit), and the other path is used to detect the frequency of the signal, i.e. the signal is converted into a pulse signal by the frequency detection circuit formed by the zero-crossing comparison circuit. The ATMEGA16 singlechip selects a proper measuring range (namely, selects one of the three paths of output voltage dividing circuits) under the control of the existing algorithm, and performs A/D conversion on the signal output by the measuring range selection circuit, and obtains the amplitude of the signal to be detected through calculation; the pulse signal output by the frequency detection circuit is subjected to frequency measurement, whether the pulse signal is a direct current signal or an alternating current signal is judged according to the frequency value, and the obtained parameters (signal type, amplitude and frequency) are displayed through a 1602 LCD.
Preferably, in the embodiment, as shown in fig. 2, the amplitude tracking circuit is composed of U1, U2, U3 and related rc elements, and outputs a dc voltage, wherein the output voltage is equal to the input level when the input signal is a dc signal, and the output voltage is equal to the amplitude of the input signal when the input signal is an ac signal. That is, the voltage output by the amplitude tracking circuit can track the amplitude of the input signal regardless of whether the input is direct current or alternating current.
As shown in fig. 2, the range selection circuit is composed of a voltage division circuit and an analog electronic switch circuit. Because the maximum voltage output by the amplitude tracking circuit is 15V, and the singlechip can only perform A/D conversion on the voltage less than 5V, the output voltage of the amplitude tracking circuit needs to be divided into three equal parts. Three 100k resistors R4, R5 and R6 are connected in series to divide voltage.
The analog electronic switch circuit consists of an analog electronic switch 4051, triodes Q1 and Q2, and pull-up resistors R7 and R8. Because the high level of the singlechip is 5V, and when 4051 supplies power at 15V, the high level is judged only when the input is more than 11V, a level conversion circuit is needed between the singlechip and the input, and two inverters are formed by Q1, R7, Q2 and R8 in the design to realize the level conversion of two circuit signals. The single chip microcomputer selects one of V3, V4 and V5 to carry out A/D conversion by controlling the level of the PB7 and PB6 pins. When PB7=1 and PB6=1, 4051 selects "V3 gear", namely V3 voltage is input to the singlechip to carry out A/D conversion; when PB7=1 and PB6=0, 4051 selects "V4 gear", namely V4 voltage is input to the singlechip to carry out A/D conversion; PB7=0, PB6=1, 4051 selects "V5 shelves" promptly, V5 voltage inputs to the singlechip and carries out A/D conversion. Obviously, the three output voltages of the voltage division circuit are respectively:
. Since the maximum voltages of V3, V4, and V5 are 5V, the maximum output voltages of V2 allowed when measured with V3, V4, and V5 are determined to be 5V, 7.5V, and 15V, respectively.
As shown in fig. 2, the frequency detection circuit is implemented by a zero-crossing comparator composed of TLC372, R9, R10. When the signal voltage is greater than 0, V6 is high, otherwise V6 is low. If the input signal is an alternating current signal, V6 is a pulse signal with the same frequency as the input signal; if the input signal is a dc signal, V6 is all high, i.e. the frequency is 0. Therefore, the single chip microcomputer can judge whether the input signal is a direct current signal or an alternating current signal by measuring the frequency of V6.
Fig. 3 is a circuit diagram of a minimum system circuit of the AVR single chip microcomputer ATMEGA16, namely a circuit diagram of a control chip. In order to simplify the circuit, the ATMEGA16 singlechip uses an internal 4MHz RC oscillator, and selects the power supply voltage +5V as the reference voltage of A/D conversion. The LCD is connected with the single chip microcomputer in a 4-bit parallel transmission mode, as shown in FIG. 4.
Preferably, in this embodiment, the +5V voltage in the device is obtained by inputting +15V through 7805, as shown in fig. 5.
The main tasks of the singlechip in the device are as follows: firstly, measuring frequency; secondly, selecting a proper measuring range to carry out A/D conversion and solving an actual voltage value according to a control strategy, wherein if the V3 gear is selected, the value after the A/D conversion is the actual voltage value, if the V4 gear is selected, the value after the A/D conversion is multiplied by 3/2 to obtain the actual voltage value, and if the V5 gear is selected, the value after the A/D conversion is multiplied by 3 to obtain the actual voltage value; and thirdly, displaying the related parameters on an LCD. In order to realize the real-time performance of detection, the measurement frequency is completed by a timed interruption program, a main program is initialized, and then a measuring range switching subprogram of the amplitude of a detection signal and a program for displaying the measured parameters are circularly operated. Fig. 6 is a flowchart of a range switching subroutine for detecting the amplitude of a signal.
Preferably, in the present embodiment, the range switching strategy of the range selection circuit (the circuit formed by U4, R4-R8, Q1, Q2 in fig. 2) is as follows: as shown in fig. 6, the maximum range is used to test the approximate magnitude of the voltage, then the most suitable range is switched to carry out accurate measurement, when V2 is less than or equal to 5V, the "V3 gear" is selected to carry out a/D conversion, and the value after the a/D conversion is the actual voltage value; when the voltage is more than 5V and less than or equal to 7.5V and V2, selecting a V4 gear to perform A/D conversion, and multiplying the value after the A/D conversion by 3/2 to obtain an actual voltage value; when the voltage is more than 7.5V and less than or equal to 15V and the voltage is more than or equal to 7.5V and 2, selecting V5 gear to carry out A/D conversion, and multiplying the value after the A/D conversion by 3 to obtain the actual voltage value.
Preferably, the embodiment:
1. the device is fully intelligent, and no manual operation is needed during measurement. (1) A range selection circuit is adopted on hardware, and a range switching strategy is adopted in the method; (2) and judging whether the signal to be detected is a direct current signal or an alternating current signal through the frequency.
2. The function is various, can survey direct current again can survey the alternating current signal. An amplitude detection circuit and a frequency detection circuit suitable for both direct current and alternating current signals are adopted.
3. The measurement precision is high. According to the tested voltage, the most suitable measuring range is selected for accurate measurement, and in addition, an A/D converter in the single chip microcomputer is 10 bits.
4. The cost performance is high. The hardware circuit is simple, and the cost is low.
It is worth mentioning that the utility model protects a hardware structure, as for the control method does not require protection. The above is only a preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments, and any equivalent changes and modifications made according to the present invention do not exceed the scope of the present invention, and all belong to the protection scope of the present invention.
Claims (4)
1. The utility model provides an alternating current-direct current signal parameter intellectual detection system device which characterized in that: the device comprises an amplitude tracking circuit, a range selection circuit, a zero-crossing comparison circuit, a control chip circuit, a power module circuit and a display screen; the amplitude tracking circuit is connected with the range selection circuit and used for converting one path of signals of the signals to be detected into level signals with the same amplitude as the signals to be detected through the amplitude tracking circuit and then outputting the level signals through the range selection circuit; the range selection circuit is connected with the control chip circuit and used for carrying out A/D conversion on the output signal and obtaining the amplitude of the signal to be detected; the zero-crossing comparison circuit is connected with the control chip circuit and used for outputting a pulse signal to the other path of the signal to be detected through the zero-crossing comparator circuit, measuring the frequency of the output pulse signal through the control chip circuit and judging whether the signal is a direct current signal or an alternating current signal according to the frequency value; the control chip circuit is also connected with the display screen and used for displaying the obtained signal type, amplitude and frequency; the power module circuit is respectively connected with the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen and is used for providing electric energy for the amplitude tracking circuit, the range selection circuit, the zero-crossing comparison circuit, the control chip circuit and the display screen.
2. The intelligent AC/DC signal parameter detection device according to claim 1, wherein: the range selection circuit comprises a three-way voltage division circuit and an analog electronic switch circuit; the analog electronic switch is connected with the control chip circuit; the three voltage division circuits are respectively connected with the amplitude tracking circuit and the analog electronic switch circuit and are used for carrying out trisection voltage division on the voltage output by the amplitude tracking circuit, the three voltages are transmitted to the analog electronic switch circuit for selection, and one of the three voltages is selected and then transmitted to the control chip circuit.
3. The intelligent AC/DC signal parameter detection device according to claim 1, wherein: the control chip adopted by the control chip circuit is a single chip microcomputer, and the model of the control chip circuit is ATMEGA 16.
4. The intelligent AC/DC signal parameter detection device according to claim 1, wherein: the display screen is of the type LCD 1602.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023125144.XU CN213581812U (en) | 2020-12-23 | 2020-12-23 | AC/DC signal parameter intelligent detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023125144.XU CN213581812U (en) | 2020-12-23 | 2020-12-23 | AC/DC signal parameter intelligent detection device |
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| CN213581812U true CN213581812U (en) | 2021-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078798A (en) * | 2022-07-26 | 2022-09-20 | 武汉格蓝若智能技术有限公司 | Current range switching method and current collecting device |
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2020
- 2020-12-23 CN CN202023125144.XU patent/CN213581812U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078798A (en) * | 2022-07-26 | 2022-09-20 | 武汉格蓝若智能技术有限公司 | Current range switching method and current collecting device |
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