CN203069666U - Intelligent high-precision digital voltmeter - Google Patents
Intelligent high-precision digital voltmeter Download PDFInfo
- Publication number
- CN203069666U CN203069666U CN 201320097855 CN201320097855U CN203069666U CN 203069666 U CN203069666 U CN 203069666U CN 201320097855 CN201320097855 CN 201320097855 CN 201320097855 U CN201320097855 U CN 201320097855U CN 203069666 U CN203069666 U CN 203069666U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- voltage signal
- converter
- chip microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Analogue/Digital Conversion (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses an intelligent high-precision digital voltmeter, comprising a shifting circuit used for inducing a measured voltage and performing voltage reduction processing for the measured voltage when the measured voltage surpasses a preset value, an A/D convertor used for receiving an analog voltage signal transmitted by the shifting circuit and converting the analog voltage signal into a digital voltage signal, a single-chip microcomputer used for receiving the digital voltage signal transmitted by the A/D convertor and transmitting the digital voltage signal to a display circuit after processing the digital voltage signal, and the display circuit used for receiving a voltage value transmitted by the single-chip microcomputer and displaying the voltage value; wherein the shifting circuit, the A/D convertor and the display circuit are all connected with the single-chip microcomputer; and the shifting circuit also includes a voltage reduction module. The intelligent high-precision digital voltmeter of the utility model has the advantages of good extensibility, high cost performance, low cost, visual display, etc.
Description
Technical field
The utility model relates to a kind of intelligent high-precision digital voltage table.
Background technology
Digital voltmeter is a kind ofly voltage transitions can be the numeral voltage measuring instrument that directly show, it has intuitive display, advantage such as easy to use.In the prior art, digital voltmeter generally adopts the PLD device as master control unit, and this voltage table such as has on the extendability resource relatively being limited to, take also many, cost is higher at problem.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of intelligent high-precision digital voltage table is provided, with the Scalable Performance that improves voltage table, the cost that reduces voltage table.
The utility model be the technical solution problem by the following technical solutions.
Intelligence high-precision digital voltage table, its design feature is, comprise for introduce tested voltage and when tested voltage surpasses preset value, tested voltage carried out gearshift circuit that step-down handles, be used for accepting analog voltage signal and the A/D converter that analog voltage signal is converted into digital voltage signal that the gearshift circuit transmits, be used for receiving digital voltage signal that A/D converter transmits and digital voltage signal handled after send the single-chip microcomputer of display circuit to and be used for receiving the magnitude of voltage that single-chip microcomputer transmits and the display circuit that shows this magnitude of voltage; Described gearshift circuit, A/D converter and display circuit all are connected with described single-chip microcomputer; Described gearshift circuit also comprises for when tested voltage surpasses preset value tested voltage being carried out the step-down module that step-down is handled.
Intelligent high-precision digital voltage table of the present utility model also has following technical characterstic.
Described A/D converter is the TLC549A/D converter.
Described gearshift circuit comprises relay R L1, triode Q1, operational amplifier U3, operational amplifier U4 and operational amplifier U5.
Compared with the prior art, the utility model beneficial effect is embodied in:
Intelligent high-precision digital voltage table of the present utility model has the advantage of the following aspects:
1) adopt the AT89C52 singlechip chip as control section, single-chip microcomputer has abundant interrupt source, and its accuracy is quite high, and the applying in a flexible way of C language, and has been with convenience to programming.The I/0 function of single-chip microcomputer is also more powerful, easily it is expanded, and makes design more perfect.The cost of single-chip microcomputer is lower in addition; In sum, AT89C52 aboundresources, programming are also simple flexibly, and cost performance is also high, so select AT89C52 as main control chip;
2) adopt 12864 LCDs; 12864 liquid crystal also are a kind of industrial character mode lcds, and it not only can show information such as character that 1602 liquid crystal can show, numeral, but also can show 8*4 Chinese character and some simple pictures, and demonstration information is very clear also.Also directly writing software program during use gets final product by the certain time sequence driving.
3) adopt TLC549 as A/D converter, it is a kind of low price, high performance 8 A/D converters, and the method that it approaches one by one with 8 bit switch electric capacity realizes the A/D conversion, and its slewing rate is lower than 17us, maximum slew rate is 40000HZ, has conversion accuracy height, fireballing advantage.
Intelligent high-precision digital voltage table of the present utility model has advantages such as Scalable Performance is good, cost performance is high, cost is low, intuitive display.
Description of drawings
Fig. 1 is the structured flowchart of intelligent high-precision digital voltage table of the present utility model.
Fig. 2 is the circuit diagram (1) of the gearshift circuit of intelligent high-precision digital voltage table of the present utility model.
Fig. 3 is the circuit diagram (2) of the gearshift circuit of intelligent high-precision digital voltage table of the present utility model.
Below pass through embodiment, and the utility model is described in further detail by reference to the accompanying drawings.
Embodiment
Referring to Fig. 1～Fig. 3, intelligence high-precision digital voltage table, comprise for introduce tested voltage and when tested voltage surpasses preset value, tested voltage carried out gearshift circuit that step-down handles, be used for accepting analog voltage signal and the A/D converter that analog voltage signal is converted into digital voltage signal that the gearshift circuit transmits, be used for receiving digital voltage signal that A/D converter transmits and digital voltage signal handled after send the single-chip microcomputer of display circuit to and be used for receiving the magnitude of voltage that single-chip microcomputer transmits and the display circuit that shows this magnitude of voltage; Described gearshift circuit, A/D converter and display circuit all are connected with described single-chip microcomputer; Described gearshift circuit also comprises for when tested voltage surpasses preset value tested voltage being carried out the step-down module that step-down is handled.
Tested analog voltage signal is introduced by the gearshift circuit, if tested voltage is no more than preset value (this preset value is according to the upper limit adjustment of the collection voltage of A/D converter), the circuit of shifting gears so directly sends tested analog voltage signal to A/D converter; If tested voltage has surpassed preset value, by the step-down module of gearshift circuit tested voltage is carried out 1/2 step-down and handle, after being at half, tested voltage drop sends A/D converter to; Simultaneously, the gearshift circuit sends signal of single-chip microcomputer to, and the tested voltage of this signal indicating is handled through step-down 1/2.A/D converter receives the analog voltage signal that the gearshift circuit transmits, and carries out the digital-to-analog conversion of voltage signal, this analog voltage signal is converted into corresponding digital voltage signal, and sends this digital voltage signal to single-chip microcomputer.Single-chip microcomputer through handling, if be twice through again voltage being expanded of handling of step-down, sends digital voltage signal to display circuit then, by the LCD of display circuit magnitude of voltage is shown.
Intelligent high-precision digital voltage table of the present utility model adopts AT89C52 as master control system, and the LCD1602 liquid crystal is as the display part, and TLC549 is as the A/D modular converter.The aanalogvoltage of input judges that by the gearshift circuit if less than 5v, then directly send into the A/D conversion chip and gather, the digital voltage that obtains after the conversion is shown by display module.If greater than 5V, then doing 1/2nd step-downs by the gearshift circuit handles, and the voltage after will handling is sent into the A/D conversion chip and is gathered, single-chip microcomputer learns that by the gearshift circuit this voltage is greater than 5V simultaneously, send into the display part after voltage expansion after will gathering is twice and show in program, show numerical value thereby obtain real voltage.
Described A/D converter is the TLC549A/D converter.
TLC549 is 8 bits serial A/D converter chip, can carry out serial line interface by CLK, CS, DATA OUT three Tiaokou lines with general purpose microprocessor, controller.Have system clock and soft, hardware control circuit in the 4MHZ sheet, switching time the longest 17us, TLC549 is 4000 times/s.Total offset error is to the maximum ± 0.5LSB, and typical power consumption value is 6mW.Employing differential reference voltage high resistant is imported, and is anti-interference, in proportion the range calibration conversion range.
Described gearshift circuit comprises relay R L1, triode Q1, operational amplifier U3, operational amplifier U4 and operational amplifier U5.
Because A/D converter TLC549 gathers the upper limit of voltage, and the test voltage scope of voltage table of the present utility model is 0～10V, so carrying out ratio with the voltage of 5V～10V, the step-down module that needs the gearshift circuit dwindles, gather for TLC549.The gearshift circuit mainly contains integrated transporting discharging and relay is formed, and the design of its hardware circuit respectively as shown in Figures 2 and 3.
As Fig. 2 and Fig. 3, at first analog input voltage (in) compares through integrated transporting discharging (U3), if less than 5V, then the out end is low level, not conducting of triode Q1, and in and ain connect, input voltage is directly received TLC549, is shown at display screen after changing.If input voltage is greater than 5V, then the out end is high level, triode Q1 conducting, the shell fragment of relay is attracted, and a and ain connect, and a dwindles half gained by input voltage through scale operation circuit (U4 and U5 form), its voltage range is between 0-5v, within the acquisition range of TLC549, in program, this part voltage is enlarged half then then, shown at display screen to obtain real magnitude of voltage.
Claims (3)
1. intelligent high-precision digital voltage table, it is characterized in that, comprise for introduce tested voltage and when tested voltage surpasses preset value, tested voltage carried out gearshift circuit that step-down handles, be used for accepting analog voltage signal and the A/D converter that analog voltage signal is converted into digital voltage signal that the gearshift circuit transmits, be used for receiving digital voltage signal that A/D converter transmits and digital voltage signal handled after send the single-chip microcomputer of display circuit to and be used for receiving the magnitude of voltage that single-chip microcomputer transmits and the display circuit that shows this magnitude of voltage; Described gearshift circuit, A/D converter and display circuit all are connected with described single-chip microcomputer; Described gearshift circuit also comprises for when tested voltage surpasses preset value tested voltage being carried out the step-down module that step-down is handled.
2. intelligent high-precision digital voltage table according to claim 1 is characterized in that, described A/D converter is the TLC549A/D converter.
3. intelligent high-precision digital voltage table according to claim 1 is characterized in that, described gearshift circuit comprises relay R L1, triode Q1, operational amplifier U3, operational amplifier U4 and operational amplifier U5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097855 CN203069666U (en) | 2013-03-04 | 2013-03-04 | Intelligent high-precision digital voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097855 CN203069666U (en) | 2013-03-04 | 2013-03-04 | Intelligent high-precision digital voltmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203069666U true CN203069666U (en) | 2013-07-17 |
Family
ID=48768438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320097855 Expired - Fee Related CN203069666U (en) | 2013-03-04 | 2013-03-04 | Intelligent high-precision digital voltmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203069666U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983831A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Voltmeter and voltmeter pen special for protecting pressure plate |
| CN105353201A (en) * | 2015-12-14 | 2016-02-24 | 浪潮(北京)电子信息产业有限公司 | Voltage data measurement method and system |
| CN106802364A (en) * | 2017-03-14 | 2017-06-06 | 南宁市高光信息技术有限公司 | A kind of digital voltmeter system |
-
2013
- 2013-03-04 CN CN 201320097855 patent/CN203069666U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983831A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Voltmeter and voltmeter pen special for protecting pressure plate |
| CN105353201A (en) * | 2015-12-14 | 2016-02-24 | 浪潮(北京)电子信息产业有限公司 | Voltage data measurement method and system |
| CN106802364A (en) * | 2017-03-14 | 2017-06-06 | 南宁市高光信息技术有限公司 | A kind of digital voltmeter system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203069666U (en) | Intelligent high-precision digital voltmeter | |
| CN101807053A (en) | Structure of multi-channel high-speed pulse counting for industrial control touch screen | |
| CN203949716U (en) | A kind of digital weighing sensor | |
| CN205228803U (en) | Isolator state test device | |
| CN205122151U (en) | Novel test of multi -functional LCD module device | |
| CN201477136U (en) | Color LCD multifunctional power instrument | |
| CN201765279U (en) | TFT-LCD display-based electric power quality analysis meter | |
| CN202661573U (en) | Capacitance and inductance measurement circuit | |
| CN201594112U (en) | Digital voltmeter | |
| CN201885737U (en) | Digital display instrument | |
| CN204479667U (en) | A kind of portable electric energy quality analysis system based on DSP and ARM | |
| CN207650989U (en) | A kind of intelligence instrument data collection architecture | |
| CN203588034U (en) | Temperature detection experiment module based on PLC controller | |
| CN203479389U (en) | One-piece weighing instrument big screen | |
| CN203672963U (en) | Digital voltmeter based on singlechip | |
| CN203573181U (en) | PH controller | |
| CN201909805U (en) | Digital universal meter | |
| CN201583589U (en) | Digital voltmeter | |
| CN203551997U (en) | Signal collector | |
| CN105741837A (en) | Voice control system based on SPCE061A | |
| CN202816188U (en) | Pressure analog dial indicator having serial communication interface | |
| CN203883481U (en) | Independent compensation and co-compensation universal intelligent capacitor | |
| CN202304888U (en) | Instrument for measuring phase frequency time | |
| CN202486697U (en) | Man-machine interactive system for real-time image analysis of embedded machine vision system | |
| CN201364360Y (en) | Circuit voltage testing device |
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 |
Granted publication date: 20130717 Termination date: 20150304 |
|
| EXPY | Termination of patent right or utility model |