CN102353830A - Peak voltage digital display meter - Google Patents
Peak voltage digital display meter Download PDFInfo
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- CN102353830A CN102353830A CN201110152723XA CN201110152723A CN102353830A CN 102353830 A CN102353830 A CN 102353830A CN 201110152723X A CN201110152723X A CN 201110152723XA CN 201110152723 A CN201110152723 A CN 201110152723A CN 102353830 A CN102353830 A CN 102353830A
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Abstract
The invention discloses a peak voltage digital display meter and relates to a measuring apparatus for a voltage pulse peak value. The peak voltage digital display meter mainly consists of an automatic range switching circuit, a peak voltage collecting and retaining circuit, an A/D (Analog-to-Digital) conversion circuit and a main control circuit, wherein the automatic range switching circuit mainly consists of a CD4052 double four-in-one multi-path switch I, a CD4052 double four-in-one multi-path switch II, an OP07 operational amplifier and a divider resistor; the peak voltage collecting and retaining circuit mainly consists of an LF398 sampling holder and an LM311 voltage comparator; the A/D conversion circuit is provided with a 12-bit AD574 chip; the main control circuit comprises an input keyboard, a master processing chip and a display output module; the master processing chip is provided with an 89C52 single chip computer; and the display output module comprises a digital display circuit and a digital display tube. The measuring range of the total peak voltage of the peak voltage digital display meter is 1 mv-1000 V, and the measuring accuracy is high.
Description
Technical field
Technical scheme of the present invention relates to the measurement mechanism that is used for the potential pulse peak value, specifically the crest voltage digital display meter.
Background technology
Voltage peak is a very important electrical parameter in the engineering practice, also is various electric equipment products one of necessary safety factors of considering in its design and use.For DC voltage, effective value, peak value, mean value all are identical, select for use moving-coil instrument to measure usually; For sinusoidal voltage, peak value is about 1.414 times of effective value, select for use electromagnetic type or electrodynamic type meter to measure effective value usually after, calculate peak value in proportion.Yet for non-sinusoidal voltage, do not have fixing proportionate relationship between peak value and the effective value, at this moment voltage peak must be measured by specialized apparatus.Existing crest voltage measuring instrument can only obtain measurement result in its fixing less measurement range, measurement range is less and precision is not high.
Summary of the invention
Technical matters to be solved by this invention is: the crest voltage digital display meter is provided; Size according to measured crest voltage is selected range automatically; Overcome existing crest voltage measuring instrument and can only in its fixing less measurement range, obtain measurement result, the shortcoming that measurement range is less and precision is not high.
The present invention solves the technical problem the technology program are: peak voltage digital form, mainly by automatic range switching circuit, the peak voltage acquisition and holding circuit, A / D converter circuit and control circuit composed of four parts, including automatic range switching circuit mainly by CD4052 dual four selected more than one way switch I, CD4052 choose more than one pair of four-way switch II, OP07 operational amplifier and a voltage divider resistors, the peak voltage acquisition and holding circuit mainly by an LF398 sample holder and a LM311 voltage a comparator constituted, A / D conversion circuit using 12-bit AD574 chip, control circuit from the keyboard input, the main processing chip and display output modules, wherein the main processing chip 89C52 microcontroller, the display output module includes a digital display circuit and the digital display tube; automatic range switching circuit CD4052 dual four-way switch II selected more than one output terminal and a peak voltage acquisition and retention LF398 sample and hold circuit connected to the input, the peak voltage holding circuit LF398 acquisition and the output of the sample and hold and A / D conversion circuit connection, A / D converter circuit and control circuit according to AD conversion circuit pin 89C52 microcontroller connected to the corresponding pin, keyboard input is connected to the 89C52 microcontroller, 89C52 microcontroller also simultaneously display the output module, the range Automatic switching circuit, the peak voltage acquisition and holding circuit and A / D conversion circuit, which connects to the peak voltage of the DRO overall circuit; said automatic range switching circuit connections are: peak voltage signal input and CD4052 dual quad-election more than one way switch I connected to the CD4052 dual four-way switch I choose more than one output signal through the resistor divider down and sent to the input of operational amplifier OP07, CD4052 dual four-way switch II selected more than one input terminal and OP07 operational amplifier connected to the cathode, CD4052 choose more than one pair of four-way switch I and elect more than one CD4052 dual four-way switch control terminal II respectively 89C52 MCU P1.1, P1.2 and P1.3, P1.4 connected ; the acquisition and peak voltage holding circuit connection method is: LF398 sample holder 3-pin input terminal and the output terminal 5 pins are connected to the positive and negative poles of the voltage comparator LM311, LM311 voltage comparator while the output of the sampling and LF398 retainer pin logic control terminal 8 is connected, LM311 voltage comparator output and pull-up resistor is connected to R1, LF398 sample holder 6 pin diode IN4148 through the emitter of the transistor 9013 is connected to the base of transistor 9013 and 89C52 MCU P1.5 connected while LF398 sample holder 6 pin voltage holding capacitor C1 is connected to the voltage comparator LF398 of a pin and 4-pin power supply positive and negative phase connection, LF398 sample and hold the two cited feet and phaser R2 is connected.
Above-mentioned crest voltage digital display meter; Described circuit all is placed in the carton and crate with whole components and parts; The header board of this carton and crate is highly to be that 120mm, width are that 120mm and thickness are the outer screen of 12mm, and this outer screen is provided with six displays of measuring the range selection button, power switch and the six figure place sign indicating numbers that show gears; The bonnet height of this carton and crate is that 110mm, width 1 are that 110mm and thickness are 56mm.
Above-mentioned crest voltage digital display meter, six of being had measure and show that gear is respectively: 1mv～10mV, 10mv～100mV, 100mv～1V, 1V～10V, 10V～100V and 100V～1000V.
Above-mentioned crest voltage digital display meter, the chip integration of said 89C52 single-chip microcomputer becomes to have built-in random access memory ram and read only memory ROM.
Above-mentioned crest voltage digital display meter, said keyboard input is adopted and is interrupted defeated people's mode, takies the outer middle fracture INTO of 89C52 single-chip microcomputer.
Above-mentioned crest voltage digital display meter, said digital display tube is made up of 6 LED, adopts static the demonstration and decoded mode.
Above-mentioned crest voltage digital display meter, wherein involved circuit, element and connected mode thereof all are that those skilled in the art know, and used components and parts can be through being purchased acquisition.
Above-mentioned crest voltage digital display meter, the running program of its governor circuit comprise master routine, interrupt routine, data acquisition subroutine and display subroutine, wherein,
Is main program flow: program initialization → open interruption → measurement to accomplish? N → return measurement; Y, complement mark are that 1 → A/D changes → calls data processing subroutine → call display subroutine → removing and measures complement mark.
Is the interrupt routine flow process: preserve and interrupt interrupt spot → first time? The n time interruption of N → change over to? Y → open and regularly interrupt T0 → the n time interruption? N → interruption times adds 1 → end; Y → timeing closing device T0 → storage time and interruption times → interruption times and timer reset → set measurement complement mark → recovery scene → end.
Is data acquisition subroutine flow process is: beginning to gather voltage → P1.5 high voltage? Y → change Acquisition Circuit over to and discharge → return and restart to gather voltage; N → change the comparison input terminal voltage over to greater than output end voltage? Y → collection voltage; N → sustaining voltage → return and restart to gather voltage.
Does the display subroutine flow process is: beginning → 89c52 initialization → static state show that initialization → a send word selection → look into Duan Xuanbiao → section code selection sends into → delay time that 1ms → sensing next one cushions display unit → 6 shows completion? N → demonstration next bit → return is static to show initialization; Y → end.
The invention has the beneficial effects as follows: crest voltage digital display meter of the present invention is a kind of intelligent crest voltage digital display meter; Select a multi-way switch I owing to being provided with at crest voltage digital display meter of the present invention by CD4052 two four; CD4052 two four selects a multi-way switch II; The range automatic switching circuit that OP07 operational amplifier and divider resistance constitute and by a LF398 sampling holder and a crest voltage collection and the holding circuit that the LM311 voltage comparator constitutes; Crest voltage digital display meter of the present invention for this reason can be selected range automatically according to the size of measured crest voltage; This crest voltage digital display meter has six gears; Be respectively 1mv～10mV; 10mv～100mV; 100mv～1V; 1V～10V; 10V～100V and 100V～1000V; The measurement range of crest voltage frequency is between 0～1000HZ; And measuring accuracy is higher; Can reach 0.5 μ v; And through digital display circuit and digital display tube in addition numeral show measurement result; The waveform of tested voltage is unrestricted; Periodicity or aperiodicity all can; Therefore the scope of application is wider; Add corresponding calculated judge module and back to control circuit; Also can realize robotization and the intellectuality controlled; Overcome existing crest voltage measuring instrument thus fully and can only in its fixing less measurement range, obtain measurement result, the shortcoming that measurement range is less and precision is not high.Further illustrated the substantive distinguishing features that the present invention gives prominence in the following example.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the formation schematic block diagram of crest voltage digital display meter of the present invention.
Fig. 2 is the range automatic switching circuit figure of crest voltage digital display meter of the present invention.
Fig. 3 is the crest voltage collection and the holding circuit figure of crest voltage digital display meter of the present invention.
Fig. 4 is the A/D change-over circuit figure of crest voltage digital display meter of the present invention.
Fig. 5 is the master control and the digital display circuit figure of crest voltage digital display meter of the present invention.
Fig. 6 is the overall connection line figure of crest voltage digital display meter of the present invention.
Fig. 7 is the main program flow chart of crest voltage digital display meter of the present invention.
Fig. 8 is the interrupt routine process flow diagram of crest voltage digital display meter of the present invention.
Fig. 9 is the data acquisition subroutine flow chart of crest voltage digital display meter of the present invention.
Figure 10 is the display subroutine process flow diagram of crest voltage digital display meter of the present invention.
Figure 11 is the profile view of crest voltage digital display meter of the present invention.
Among the figure, 1.CD4052 two four selects a multi-way switch I, and 2.CD4052 two four selects a multi-way switch II, 3. divider resistance, 4.OP07 operational amplifier, 5. carton and crate header board, 6. carton and crate bonnet, the 7. display of six figure place sign indicating numbers, 8. power switch, 9. range selection button.
Embodiment
Explanation embodiment illustrated in fig. 1 crest voltage digital display meter of the present invention has comprised range automatic switching circuit; Crest voltage is gathered and holding circuit; A/D change-over circuit and governor circuit four parts; Wherein governor circuit has comprised the keyboard input again; 89C52 single-chip microcomputer (promptly main process chip) and demonstration output module; Range automatic switching circuit connects crest voltage collection and holding circuit; Crest voltage is gathered and holding circuit connects the A/D change-over circuit; The A/D change-over circuit is connected to the 89C52 single-chip microcomputer in the governor circuit; The keyboard input is connected to the 89C52 single-chip microcomputer, and the 89C52 single-chip microcomputer is while and demonstration output module also; Range automatic switching circuit; Crest voltage collection and holding circuit are connected with the A/D change-over circuit.
The range automatic switching circuit figure that shows crest voltage digital display meter of the present invention embodiment illustrated in fig. 2 mainly comprises CD4052 two four and selects a multi-way switch I 1, CD4052 two four to select a multi-way switch II 2, divider resistance 3 and OP07 operational amplifier 4; CD4052 two four selects a multi-way switch I 1 to be used for step-down; CD4052 two four selects a multi-way switch II 2 to be used for voltage amplification; Its result is to make this part output voltage to satisfy the needs of subsequent conditioning circuit, and the selection of switch is by the high-low level decision of CPU respective pins; The effect of OP07 operational amplifier 4 is: when the peak voltage signal of input is too small, select a multi-way switch II 2 through switching CD4052 two four, OP07 operational amplifier 4 can reach the effect of amplifying different multiples.The connected mode of range automatic switching circuit is: the peak voltage signal input end selects a multi-way switch I 1 to link to each other with CD4052 two four; By the input end of sending into OP07 operational amplifier 4 after CD4052 pair of four signal process divider resistance 3 step-downs of selecting a multi-way switch I 1 to export; CD4052 two four selects the input end of a multi-way switch II 2 to link to each other with the negative electrode of OP07 operational amplifier 4; CD4052 two four select control end that a multi-way switch I 1 and CD4052 two four select a multi-way switch II 2 respectively with the P1.1 of 89C52 single-chip microcomputer; P1.2 and P1.3; P1.4 is connected, and the peak voltage signal input end selects the XO place of a multi-way switch I to link to each other with CD4052 two four.
The effect of range automatic switching circuit is to select different ranges according to the size of tested voltage; And can under the control of governor circuit, carry out suitable step-down and tested low pressure is carried out suitable amplification tested high pressure automatically; Satisfy the needs of subsequent conditioning circuit; Call corresponding subroutine by master routine this part voltage sampling signal is compensated correction; Both reduced measuring error thus, played a protective role again to prevent that overtension from causing damage to instrument.As when input voltage is 1000V; The 89C52 single-chip microcomputer sends switch and selects signal that X and X3 are connected, and can be output as 1V according to resistance step-down computing this moment, and this voltage satisfies the subsequent voltage requirement; CD4052 two four selects a multi-way switch II 2 that X0 and X are connected at this moment, promptly directly exports this signal.When input voltage is 20mv; CD4052 two four selects a multi-way switch I 1 that X0 and X are connected, and CD4052 two four selects a multi-way switch II 2 to make X2 and X connection, promptly constitutes enlargement factor and be 100 operational amplifier; Output voltage is 2V, also satisfies the subsequent conditioning circuit requirement this moment.
The crest voltage collection of crest voltage digital display meter of the present invention and the holding circuit figure of showing embodiment illustrated in fig. 3 mainly is made of a LF398 sampling holder and a LM311 voltage comparator; The connected mode of crest voltage collection and holding circuit is: input 3 pins and output 5 pins of LF398 sampling holder are connected on LM311 voltage comparator positive and negative polarities respectively; LM311 voltage comparator output links to each other with logic control end 8 pins of LF398 sampling holder simultaneously; LM311 voltage comparator output links to each other with the R1 pull-up resistor again; 6 pins of LF398 sampling holder link to each other with the emitter stage of triode 9013 by diode IN4148; The base stage of triode 9013 links to each other with the P1.5 of 89C52 single-chip microcomputer; 6 pins of LF398 sampling holder keep capacitor C 1 to link to each other with voltage simultaneously; 1 pin of voltage comparator LF398 is connected with the power supply positive and negative utmost point with 4 pins, and 2 pins of LF398 sampling holder are connected with phaser R2.Wherein the input voltage of LF398 sampling holder is the output voltage of selective circuit of measuring range; The output voltage of LF398 sampling holder and input voltage are by the LM311 voltage comparator relatively; When input voltage during greater than output voltage; LM311 voltage comparator output high level; Deliver to 8 pins of LF398 sampling holder; Make the LF398 sampling holder be in sample states; When input voltage during less than output voltage; LM311 voltage comparator output LOW voltage; Make the LF398 sampling holder be in hold mode; Sampling is sent clear signal by P1.5 after accomplishing, and measures from newly beginning.
Adopted 12 AD574 chip among the A/D change-over circuit figure that shows crest voltage digital display meter of the present invention embodiment illustrated in fig. 4, had conversion accuracy and reach the characteristics of 25 μ s soon with slewing rate up to 0.05%.The A/D transformation is that the simulating signal that will collect is converted into the digital signal that single-chip microcomputer can be discerned, owing in the chip of this model ternary output buffer is arranged, can directly link to each other with microprocessor, so additional logic interface circuit again.This circuit is a prior art.
Master control and the digital display circuit figure that shows crest voltage digital display meter of the present invention embodiment illustrated in fig. 5, governor circuit is the core of crest voltage digital display meter of the present invention, and it comprises the keyboard input, and main process chip shows output module three parts.Wherein main process chip adopts the 89C52 single-chip microcomputer, and chip integration becomes to have built-in random access memory ram and read only memory ROM.Wherein, ROM is used for stored programme software; RAM is used to store the measurement data in nearly stage, so that user inquiring is in time made reflection to the unusual fluctuations of voltage peak, this function is very important to the monitoring of electric system and industrial processes.Keyboard and data display unit are also included within the governor circuit, and keyboard adopts and interrupts defeated people's mode, take the outer middle fracture INTO of main process chip 89C52 single-chip microcomputer; Show that output module comprises digital display circuit and digital display tube, digital display tube is made up of 6 LED, adopts static the demonstration and decoded mode.Circuit shown in Figure 5 is a prior art.
The overall connection line that shows crest voltage digital display meter of the present invention embodiment illustrated in fig. 6; Wherein the A frame of broken lines partly is a range automatic switching circuit; The B frame of broken lines partly is crest voltage collection and holding circuit; The C frame of broken lines partly is the AD574 chip in the A/D change-over circuit; The voltage range that the AD574 chip can bear is-10～10V; The D frame of broken lines partly is the main process chip 89C52 single-chip microcomputer among master control and the digital display circuit figure; The CD4052 of range automatic switching circuit two four selects the output of a variable connector II to be connected with crest voltage collection and holding circuit; The output of the LF398 sampling holder of crest voltage collection and holding circuit is connected with the AD574 chip in the A/D change-over circuit; The A/D change-over circuit is connected by corresponding pin with the 89C52 single-chip microcomputer, and the 89C52 single-chip microcomputer also is connected with crest voltage collection and holding circuit with range automatic switching circuit simultaneously.
Collected voltage signal is sent into the input of range automatic switching circuit; The 89C52 single-chip microcomputer is by pin P1.1; P1.2 and P1.3; P1.4 control range automatic switching circuit switches to suitable range; So that the voltage signal of input satisfies the needs of subsequent conditioning circuit; The output of range automatic switching circuit links to each other respectively at the LF398 sampling holder input and the LM311 voltage comparator anode input of crest voltage collection and holding circuit; When input voltage during less than output voltage; LM311 voltage comparator output LOW voltage; Make the LF398 sampling holder be in hold mode; A range automatic switching circuit control this moment A/D change-over circuit is opened interruption; And the peak voltage signal that keeps sent into the A/D change-over circuit; Make it be converted to the data signal that the 89C52 single-chip microcomputer can be discerned; The respective pins of A/D change-over circuit links to each other with single-chip microcomputer in the 89C52 single-chip microcomputer; Single-chip microcomputer calls the data subprogram voltage data of sending into is carried out computing; And store the measurement data in nearly stage, with user friendly inquiry.
Is the main program flow of crest voltage digital display meter of the present invention that shows embodiment illustrated in fig. 7: program initialization → open interruption → measurement to accomplish? N → return measurement; Y, complement mark are that 1 → A/D changes → calls data processing subroutine → call display subroutine → removing and measures complement mark.Master routine is used to control the orderly work of total system.After the energising of this crest voltage digital display meter; Master routine at first carries out initialization; Then according to the size of tested voltage; Look-at-me through keyboard produces is confirmed suitable range; And the voltage after will handling is sent into the crest voltage holding circuit; The crest voltage that collects is remained unchanged within a certain period of time, convert this crest voltage into digital signal, and the store sample data.Then master routine compensates to correct to sampled data and calculates, and this sampled value is shown output with charactron after changing.Sampling period, for improving the accuracy of measuring, the sampling period should suitably reduce by software set.For being periodically variable ac voltage signal, the sampling period should be greater than 1/10 of the measured signal cycle.
Is the interrupt routine flow process of crest voltage digital display meter of the present invention that shows embodiment illustrated in fig. 8: preserve and interrupt interrupt spot → first time? The n time interruption of N → change over to? Y → open and regularly interrupt T0 → the n time interruption? N → interruption times adds 1 → end; Y → timeing closing device T0 → storage time and interruption times → interruption times and timer reset → set measurement complement mark → recovery scene → end.Interrupt routine response button respectively interrupts and the AD interruption.Wherein T0 is interrupt register TO position.
Is the data acquisition subroutine flow process of crest voltage digital display meter of the present invention that shows embodiment illustrated in fig. 9 is: beginning to gather voltage → P1.5 high voltage? Y → change Acquisition Circuit over to and discharge → return and restart to gather voltage; N → change the comparison input terminal voltage over to greater than output end voltage? Y → collection voltage; N → sustaining voltage → return and restart to gather voltage.
Does the display subroutine flow process of crest voltage digital display meter of the present invention that shows embodiment illustrated in fig. 10 is: beginning → 89c52 initialization → static state show that initialization → a send word selection → look into Duan Xuanbiao → section code selection sends into → delay time that 1ms → sensing next one cushions display unit → 6 shows completion? N → demonstration next bit → return is static to show initialization; Y → end.
The profile that shows crest voltage digital display meter of the present invention embodiment illustrated in fig. 11, comprise carton and crate header board 5, carton and crate bonnet 6, be positioned at the six figure place sign indicating numbers at carton and crate header board 5 middle parts display 7, be positioned at the power switch 8 of carton and crate header board 5 lower left quarters and be positioned at 6 range selection buttons 9 of carton and crate header board 5 bottoms.This carton and crate header board 5 is highly to be that 120mm, width are that 120mm and thickness are the outer screen of 12mm, and the height of this carton and crate bonnet 6 is that 110mm, width 1 are that 110mm and thickness are 56mm.The range ability of 6 range selection buttons 9 is respectively: 1. 1mv～10mV, 2. 10mv～100mV, 3. 100mv～1V, 4. 1V～10V, 5. 10V～100V and 6. 100V～1000V.The display 7 of six figure place sign indicating numbers is made up of 6 LED.
Tested crest voltage is between 1mv～10mV.
Tested crest voltage is greater than between the 10mv to 100mV.
Remove and press power switch 8; Energized; The 89C52 single-chip microcomputer carries out initialization; Range automatic switching circuit can be selected the 2. 10mv～100mV in the range selection button 9 automatically; This moment, the P1.1 and the P1.2 pin of 89C52 single-chip microcomputer sent low level; X0 directly links to each other with X among the control variable connector I1; The P1.3 pin of 89C52 single-chip microcomputer sends high level; The P1.4 pin sends low level; X links to each other with X2 among the control variable connector II2; CD4052 two four selects the divider resistance 3 of a variable connector II2 and 4 actings in conjunction of OP07 operational amplifier to realize outside 100 times of amplifications to input voltage signal that down other operations and measuring process are with embodiment 1.
Tested crest voltage is greater than between the 100mv to 1V.
Remove and press power switch 8; Energized; The 89C52 single-chip microcomputer carries out initialization; Range automatic switching circuit can be selected the 3. 100mv～1V in the range selection button 9 automatically; This moment, the P1.1 and the P1.2 pin of 89C52 single-chip microcomputer sent low level; X0 directly links to each other with X among the control variable connector I1; The P1.3 of 89C52 single-chip microcomputer sends low level; The P1.4 pin sends high level; X links to each other with X1 among the control variable connector II2; CD4052 two four selects the divider resistance 3 of a variable connector II2 and 4 actings in conjunction of OP07 operational amplifier to realize outside 10 times of amplifications to input voltage signal that down other operations and measuring process are with embodiment 1.
Tested crest voltage is greater than between the 1V to 10V.
Remove and press power switch 8; Energized; The 89C52 single-chip microcomputer carries out initialization; Select the 4. 1V～10V in the range selection button 9; This moment, the P1.1 and the P1.2 pin of 89C52 single-chip microcomputer sent low level, and X0 directly links to each other with X among the control multi-way switch I 1, and the P1.3 of 89C52 single-chip microcomputer and P1.4 pin send low level; X is with outside X0 directly links to each other among the control multi-way switch II 2, other operate and measuring process with embodiment 1.
Tested crest voltage is greater than between the 10V to 100V.
Remove and press power switch 8; Energized; The 89C52 single-chip microcomputer carries out initialization; Range automatic switching circuit can be selected the 5. 10V～100V in the range selection button 9 automatically; This moment, the P1.1 pin of 89C52 single-chip microcomputer sent low level; P1.2 sends high level; X0 links to each other with X1 among the control multi-way switch I 1; Voltage signal to input carries out 10 times of step-downs; 89C52 single-chip microcomputer P1.3 and P1.4 pin send low level; X is with outside X0 directly links to each other among the control multi-way switch II 2, other operate and measuring process with embodiment 1.
Tested crest voltage is greater than between the 100V to 1000V.
Remove and press power switch 8; Energized; The 89C52 single-chip microcomputer carries out initialization; Range automatic switching circuit can be selected the 6. 100V～1000V in the range selection button 9 automatically; This moment, the P1.1 pin of 89C52 single-chip microcomputer sent high level; P1.2 sends low level; X0 links to each other with X2 among the control multi-way switch I 1; Voltage signal to input carries out 100 times of step-downs; The P1.3 of 89C52 single-chip microcomputer and P1.4 pin send low level; X is with outside X0 directly links to each other among the control multi-way switch II 2, other operate and measuring process with embodiment 1.
Involved circuit, element and connected mode thereof all is that those skilled in the art know among above-mentioned all embodiment, and used components and parts can be through being purchased acquisition.
Claims (7)
1 peak voltage digital form, wherein: the main by automatic range switching circuit, the peak voltage acquisition and holding circuit, A / D converter circuit and control circuit composed of four parts, including automatic range switching circuit mainly by CD4052 dual quad-election more than one way switch I, CD4052 choose more than one pair of four-way switch II, OP07 operational amplifier and a voltage divider resistors, the peak voltage acquisition and holding circuit mainly by an LF398 sample holder and a LM311 voltage comparator constituted, A / D conversion circuit 12 of the AD574 chip, control circuit input from the keyboard, the main processing chip and display output modules, of which the main processing chip 89C52 microcontroller, display output module includes a digital display circuit and digital display tube; automatic range switching circuit Two out of four CD4052 multiplexer output terminal II and a peak voltage holding circuit LF398 collection and sample holder connected to the input, the peak voltage holding circuit LF398 collection and sample and hold the output of the A / D conversion circuit , A / D converter circuit and control circuit according to AD conversion circuit pin 89C52 microcontroller connected to the corresponding pin, keyboard input is connected to the 89C52 microcontroller, 89C52 microcontroller also simultaneously display output module, automatic range switching circuit, the peak voltage acquisition and-hold circuit and A / D conversion circuit, which connects to the peak voltage of the DRO overall circuit; said automatic range switching circuit connections are: peak voltage signal input and CD4052 dual four-way switch I choose more than one connected by the CD4052 dual four-way switch I choose more than one output signal through the resistor divider down and sent to the input of operational amplifier OP07, CD4052 dual four-way switch II selected more than one input terminal of the operational amplifier OP07 connected to the cathode, CD4052 Select more than one pair of four-way switch I and elect more than one CD4052 dual four-way switch control terminal II respectively 89C52 MCU P1.1, P1.2 and P1.3, P1.4 connected; acquisition and retention of the peak voltage circuit connections are: LF398 sample and hold input terminal 3-pin and 5-pin output terminal respectively connected to the positive and negative poles LM311 voltage comparator, and voltage comparator LM311 LF398 sample and hold output and the logic control terminal 8 connected to the pin, LM311 voltage comparator output and pull-up resistor is connected to R1, LF398 sample holder 6 pin diode IN4148 through the emitter of the transistor 9013 is connected to the base of transistor 9013 with 89C52 microcontroller is connected to P1.5 while LF398 sample holder 6 pin voltage holding capacitor C1 is connected to the voltage comparator LF398 of a pin and 4-pin power supply positive and negative phase connection, LF398 sample holder 2 pin connected with phasers R2 .
2. according to the said crest voltage digital display meter of claim 1; It is characterized in that: described circuit all is placed in the carton and crate with whole components and parts; The header board of this carton and crate is highly to be that 120mm, width are that 120mm and thickness are the outer screen of 12mm, and this outer screen is provided with six displays of measuring the range selection button, power switch and the six figure place sign indicating numbers that show gears; The bonnet height of this carton and crate is that 110mm, width 1 are that 110mm and thickness are 56mm.
3. according to the said crest voltage digital display meter of claim 2, it is characterized in that: said six of having measure and show that gear is respectively: 1mv～10mV, 10mv～100mV, 100mv～1V, 1V～10V, 10V～100V and 100V～1000V.
4. according to the said crest voltage digital display meter of claim 1, it is characterized in that: the chip integration of said 89C52 single-chip microcomputer becomes to have built-in random access memory ram and read only memory ROM.
5. according to the said crest voltage digital display meter of claim 1, it is characterized in that: said keyboard input, adopt and interrupt defeated people's mode, take the outer middle fracture INTO of 89C52 single-chip microcomputer.
6. according to the said crest voltage digital display meter of claim 1, it is characterized in that: said digital display tube is made up of 6 LED, adopts static the demonstration and decoded mode.
7. the said crest voltage digital display meter of claim 1, it is characterized in that: the running program of its governor circuit comprises master routine, interrupt routine, data acquisition subroutine and display subroutine, wherein,
Is main program flow: program initialization → open interruption → measurement to accomplish? N → return measurement; Y, complement mark are that 1 → A/D changes → calls data processing subroutine → call display subroutine → removing and measures complement mark.
Is the interrupt routine flow process: preserve and interrupt interrupt spot → first time? The n time interruption of N → change over to? Y → open and regularly interrupt T0 → the n time interruption? N → interruption times adds 1 → end; Y → timeing closing device T0 → storage time and interruption times → interruption times and timer reset → set measurement complement mark → recovery scene → end.
Is data acquisition subroutine flow process is: beginning to gather voltage → P1.5 high voltage? Y → change Acquisition Circuit over to and discharge → return and restart to gather voltage; N → change the comparison input terminal voltage over to greater than output end voltage? Y → collection voltage; N → sustaining voltage → return and restart to gather voltage.
Does the display subroutine flow process is: beginning → 89c52 initialization → static state show that initialization → a send word selection → look into Duan Xuanbiao → section code selection sends into → delay time that 1ms → sensing next one cushions display unit → 6 shows completion? N → demonstration next bit → return is static to show initialization; Y → end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110152723XA CN102353830A (en) | 2011-06-09 | 2011-06-09 | Peak voltage digital display meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110152723XA CN102353830A (en) | 2011-06-09 | 2011-06-09 | Peak voltage digital display meter |
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| CN102353830A true CN102353830A (en) | 2012-02-15 |
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| CN102759656A (en) * | 2012-07-18 | 2012-10-31 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN103091550A (en) * | 2013-01-08 | 2013-05-08 | 北京优科利尔能源设备有限公司 | Synchronous isolation sampling direct-current power meter of wide voltage and large current |
| CN103558484A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Substation cable lightning strike interference detecting device and method |
| CN104062487A (en) * | 2013-03-20 | 2014-09-24 | 鸿富锦精密工业(武汉)有限公司 | Voltage detection system |
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
| CN106338639A (en) * | 2015-07-06 | 2017-01-18 | 河北工业大学 | Pulse peak voltage measurement and display device |
| CN111025008A (en) * | 2019-12-31 | 2020-04-17 | 深圳市有方科技股份有限公司 | Voltage detection method and device |
| CN117871921A (en) * | 2024-03-11 | 2024-04-12 | 成都汉度科技有限公司 | Single-channel multi-range automatic switching measurement circuit and load monitoring unit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759656A (en) * | 2012-07-18 | 2012-10-31 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN102759656B (en) * | 2012-07-18 | 2014-11-05 | 河北工业大学 | Power distribution network low-voltage large-current magnetic field simulation display device |
| CN103091550A (en) * | 2013-01-08 | 2013-05-08 | 北京优科利尔能源设备有限公司 | Synchronous isolation sampling direct-current power meter of wide voltage and large current |
| CN103091550B (en) * | 2013-01-08 | 2015-02-11 | 北京优科利尔能源设备有限公司 | Synchronous isolation sampling direct-current power meter of wide voltage and large current |
| CN104062487A (en) * | 2013-03-20 | 2014-09-24 | 鸿富锦精密工业(武汉)有限公司 | Voltage detection system |
| CN104062487B (en) * | 2013-03-20 | 2016-08-24 | 国家电网公司 | Voltage detecting system |
| CN103558484A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Substation cable lightning strike interference detecting device and method |
| CN104767517A (en) * | 2015-04-10 | 2015-07-08 | 乐山一拉得电网自动化有限公司 | Data display instrument analog quantity output circuit |
| CN106338639A (en) * | 2015-07-06 | 2017-01-18 | 河北工业大学 | Pulse peak voltage measurement and display device |
| CN111025008A (en) * | 2019-12-31 | 2020-04-17 | 深圳市有方科技股份有限公司 | Voltage detection method and device |
| CN117871921A (en) * | 2024-03-11 | 2024-04-12 | 成都汉度科技有限公司 | Single-channel multi-range automatic switching measurement circuit and load monitoring unit |
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Application publication date: 20120215 |