CN106338639A - Pulse peak voltage measurement and display device - Google Patents
Pulse peak voltage measurement and display device Download PDFInfo
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- CN106338639A CN106338639A CN201510393884.6A CN201510393884A CN106338639A CN 106338639 A CN106338639 A CN 106338639A CN 201510393884 A CN201510393884 A CN 201510393884A CN 106338639 A CN106338639 A CN 106338639A
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Abstract
The invention discloses a pulse peak voltage measurement and display device, and relates to a peak measurement device for AC/DC voltage. The pulse peak voltage measurement and display device is mainly composed of a hardware portion and a software portion, and is characterized in that the hardware portion comprises a voltage range switching circuit, a peak voltage acquisition and maintenance circuit, an A/D conversion circuit, a single-chip microcomputer control circuit, a display device and a 5V voltage-stabilized power supply; and the software portion comprises an operation program of the single-chip microcomputer control circuit, wherein the operation program comprises a control main program, a data acquisition subprogram, a data processing subprogram and a display subprogram. The pulse peak voltage measurement and display device can carry out intelligent detection on the peak of AC/DC voltage pulses, selects the range automatically according to the measured voltage pulse peak, can measure the peak of 1mV-1000V voltage pulses with the frequency range being 0-1000HZ, and is high in measurement precision.
Description
Technical field
Technical scheme relates to the peak value measurement device of combined-voltage, specifically peak impulse voltage
Measurement and display device.
Background technology
In alternating current circuit, in the output voltage of power supply or circuit, the voltage between certain 2 points is being continually changing, straight
In current circuit, voltage is likely to situation fluctuation.So, change in voltage is known as Voltage Peak to numerical value during highest
Value.Voltage peak is a very important electrical parameter in engineering practice, for specific waveform, by measuring peak value
Virtual value can be calculated, in addition peak value is directly related with pressure, be also that various electric equipment products are necessary in its design and use
One of safety factorss considering.For DC voltage, virtual value, peak value, meansigma methodss are all identicals；For just
For string alternating voltage, peak value is about virtual valueTimes, after generally measuring virtual value from electromagnetic type or electrodynamic type meter,
Calculate peak value in proportion, this kind of instrument, while measured waveform, can show peak value on screen simultaneously.But for
For non-sinusoidal voltage, between peak value and virtual value, there is not fixing proportionate relationship, at this moment voltage peak must be by special
With equipment measure.The instrument range being capable of measuring combined-voltage peak value on the market is all less, and range is larger
Peak voltage measuring apparatus table is all mainly used to measure the peak value of surge voltage, also needs to use cooperatively with potentiometer during use,
Overall structure is numerous and diverse, and equipment is excessively complicated.Existing measurement combined-voltage peak value instrument of realizing can only be fixing relatively at it
Measurement result is obtained, measurement range is less and precision is not high in little measurement range.
Content of the invention
The technical problem to be solved is: peak impulse voltage measurement and display device are provided, can be to alternating current-direct current
The peak value of potential pulse carries out Intelligent Measurement, automatically selects range according to the size of measured potential pulse peak value, and passes through
Numeral method device out；Instant invention overcomes existing combined-voltage peak value measurement measurement device scope is less
Shortcoming, measurable range is 1mv-1000v, the peak value of the potential pulse of frequency range 0-1000hz, and tested voltage arteries and veins
The waveform of punching is unrestricted, periodically or non-periodically.
The technical scheme that the present invention solves this technical problem and provided is: peak impulse voltage measurement and display device, mainly
It is made up of hardware and software two parts, wherein, described hardware components include voltage range switching circuit, crest voltage collection
This six part of holding circuit, a/d change-over circuit, single chip machine controlling circuit, display device and 5v regulated power supply；Described soft
Part part is the operation sequence of single chip machine controlling circuit, and including controlling, mastery routine, data acquisition routines, data processing are sub
Program and display subroutine；Described voltage range switching circuit mainly by two cd4052 double four select a variable connector i and
Ii, op07 operational amplifier and a divider resistance are constituted；Described crest voltage collection holding circuit is mainly by one piece of lf398
Sampling holder and one piece of lm311 voltage comparator are constituted；Described a/d change-over circuit by adc0809 chip and
Sun7474 chip forms；Described single chip machine controlling circuit mainly adopts 89c52 single-chip microcomputer；Described display device is led
Numeral method device, its circuit is made up of p0, p2 mouth of 89c52 single-chip microcomputer and chip sr420561k；Peak value of pulse electricity
Pressure measurement and display device integrated connection mode are: the cd4052 of voltage range switching circuit double four selects a variable connector ii
The input of the outfan and crest voltage lf398 sampling holder that gathers holding circuit is connected, crest voltage collection guarantor
The outfan holding the lf398 sampling holder of circuit exports the adc0809 chip in sampled signal and a/d change-over circuit
Input connects, and 89c52 single-chip microcomputer carries out assignment, the output of adc0809 chip to the address input line of adc0809 chip
As the input of 89c52 single-chip microcomputer, sun7474 chip is connected with the address latch port ale of adc0809 chip, 5v
The voltage source of regulated power supply is connected by wire with the feeder ear of a/d change-over circuit, 89c52 single-chip microcomputer and display device,
89c52 single-chip microcomputer is also turned with display device, voltage range switching circuit, crest voltage collection holding circuit and a/d simultaneously
Change circuit to connect, be thus connected into the overall circuit of peak impulse voltage measurement and display device.
Above-mentioned peak impulse voltage measurement and display device, the connected mode of described voltage range switching circuit is: peak value electricity
Pressure signal input selects a variable connector i to be connected with cd4052 double four, selects a variable connector i output by cd4052 double four
Signal sends into the input of op07 operational amplifier after divider resistance blood pressure lowering, and cd4052 double four selects a variable connector ii
Input be connected with the negative electrode of op07 operational amplifier, cd4052 double four selects double four choosings of variable connector i and cd4052
The control end of one variable connector ii is connected with p2.4, p2.5 and p2.6 of 89c52 single-chip microcomputer, p2.7 respectively.
Above-mentioned peak impulse voltage measurement and display device, the connected mode that described crest voltage gathers holding circuit is:
Input 3 pin of lf398 sampling holder and outfan 5 pin are connected on lm311 voltage comparator positive and negative polarities respectively,
Lm311 voltage comparator outfan is connected with logic control end 8 pin of lf398 sampling holder simultaneously, lm311 electricity
Pressure comparator output terminal is connected with r1 pull-up resistor again, and 6 pins of lf398 sampling holder pass through diode in4148
It is connected with the emitter stage of audion 9013, the base stage of audion 9013 is connected with the p3.7 of 89c52 single-chip microcomputer, simultaneously
6 pins of lf398 sampling holder are connected with voltage holding capacitor c1,1 pin of voltage comparator lf398 and 4
Pin is connected with power supply positive and negative pole, and 2 pins of lf398 sampling holder are connected with phaser r2, and lf398 samples
The input 5 pin output analogue signal of keeper.
Above-mentioned peak impulse voltage measurement and display device, described 5v regulated power supply is by chip lm22676 and its periphery electricity
Road forms, and its chips lm22676 is as follows with the connected mode of peripheral circuit: the 7th pin vin of chip lm22676
Through input capacitance c1 and c2 earth, the 5th pin Enable Pin en of chip lm22676 meets high level, chip lm22676
The 6th pin gnd ground connection, the 2nd and 3 pin nc of chip lm22676 are hanging, the 1st pin of chip lm22676
The indirect bootstrap capacitor c3 of boot and the 8th pin sw, sw are grounded through Zener diode d1 again, and the of chip lm22676
8 pin sw output termination inductance l1 one end, the l1 other end is simultaneously grounded and electric capacity c4 through divider resistance r1 and r2 series connection
Ground connection, the 4th pin fb of chip lm22676 is connected between r1 and r2.
Above-mentioned peak impulse voltage measurement and display device, in described display device, after display is processed by 89c52 single-chip microcomputer
The measurement electric current Value Data obtaining.The p0 of single-chip microcomputer includes p0.0～p0.7, respectively with the pin a of chip sr420561k,
B, c, d, e, f, g and dp connect；P2 includes p2.0～p2.3, passes through 500 ω resistance and audion and core respectively
Pin s1, s2, s3 and s4 of piece sr420561k connects.
The measurement of above-mentioned peak impulse voltage and display device, six having measurement display gear be respectively as follows: 1mv～10mv,
10mv～100mv, 100mv～1v, 1v～10v, 10v～100v and 100v～1000v.
Above-mentioned peak impulse voltage measurement and display device, the Embedded of described 89c52 single-chip microcomputer has built-in random storage
Device ram and read only memory rom.
The measurement of above-mentioned peak impulse voltage and display device, wherein involved circuit, element and its connected mode are all
Known to those skilled in the art, used components and parts can pass through commercially available.
Above-mentioned peak impulse voltage measurement and display device, the operation sequence in its single chip machine controlling circuit includes controlling main journey
Sequence, data acquisition routines, data processing subprogram and display subroutine, content is as follows:
(1) control main program flow is: starts → initializes and input channel sets → call data acquisition routines → startup
Whether a/d conversion → a/d conversion terminates？→ n, returns and continues ad conversion；Y, calls data processing subprogram → tune
Set with display subroutine → return initialization and input channel.
(2) data acquisition routines flow process is: starts whether collection voltages → p3.7 is high voltage？Y → proceed to Acquisition Circuit
Electric discharge → return and restart collection voltages；N → proceed to and compare whether input terminal voltage is more than output end voltage？Y → collection
Voltage；N → holding voltage → return restarts collection voltages.
(3) data processing subroutine flow is: beginning → 89c52 initializes → input 8 ad transformation result → binary systems
Be converted to decimal scale bcd code → end.
(4) display subroutine flow process is: beginning → 89c52 initialization → Dynamic Announce initializes → send a word selection → look into Duan Xuan
Whether table → section code selection feeding → time delay 1ms → sensing next buffering display unit → 4 show completes？→ n, display
Next bit → return Dynamic Announce initialization；Y → end.
The invention has the beneficial effects as follows: peak impulse voltage measurement of the present invention and display device are a kind of intelligent alterating and direct currents
Pressure peak value of pulse measuring instrument, can automatically select range according to the size of measured crest voltage, peak value of pulse electricity of the present invention
Pressure measurement and display device have six gears, and 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 measures
Precision is higher, can reach 0.5 μ v；The waveform of tested voltage is unrestricted, periodically or non-periodically, because
This scope of application is wider, add corresponding calculate judge module and Background control circuit, also can achieve the automatization controlling and
Intellectuality, thus overcomes the less shortcoming of existing combined-voltage peak value measurement measurement device scope completely；The present invention
Display in display device display device is connected with the pin of chip sr420561k institute's structure by p1, p2 mouth of single-chip microcomputer
Become, the measurement electric current Value Data that display obtains after being processed by 89c52 single-chip microcomputer, simplify measuring instrument internal display part,
It is a kind of easy to carry, simple to operate, cheap, potential pulse peak value measurement instrument that certainty of measurement is high.Following enforcement
Beneficial effects of the present invention will be proved further in example.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the composition block diagram of peak impulse voltage measurement of the present invention and display device.
Fig. 2 is the voltage range switching circuit figure of peak impulse voltage measurement of the present invention and display device.
Fig. 3 is the crest voltage collection holding composition circuit diagram of peak impulse voltage measurement of the present invention and display device.
Fig. 4 is the a/d change-over circuit pie graph of peak impulse voltage measurement of the present invention and display device.
Fig. 5 is the composition circuit diagram of the 5v regulated power supply of peak impulse voltage measurement of the present invention and display device.
Fig. 6 is the display device composition circuit diagram of peak impulse voltage measurement of the present invention and display device.
Fig. 7 is single chip machine controlling circuit and the display device connection figure of peak impulse voltage of the present invention measurement and display device.
Fig. 8 is the overall connection line figure of peak impulse voltage measurement of the present invention and display device.
Fig. 9 is to control main journey in peak impulse voltage measurement of the present invention and the single chip machine controlling circuit operation sequence of display device
Program flow diagram.
Figure 10 is that in peak impulse voltage measurement of the present invention and the single chip machine controlling circuit operation sequence of display device, data is adopted
Collection subroutine flow chart.
Figure 11 is at data in peak impulse voltage measurement of the present invention and the single chip machine controlling circuit operation sequence of display device
Reason subroutine flow chart.
Figure 12 is to show son in peak impulse voltage measurement of the present invention and the single chip machine controlling circuit operation sequence of display device
Program flow diagram.
In figure, 1.cd4052 double four selects a variable connector i, 2. divider resistance, 3.op07 operational amplifier, 4.cd4052
Double four select a variable connector ii.
Specific embodiment
Embodiment illustrated in fig. 1 explanation peak impulse voltage of the present invention measurement and display device are mainly by hardware components and software portion
Be grouped into, wherein hardware components include voltage range switching circuit, crest voltage collection holding circuit, a/d change-over circuit,
Single chip machine controlling circuit, display device and 5v regulated power supply six part, its integrated circuit connected mode switches for voltage range
Circuit, crest voltage collection holding circuit, a/d change-over circuit, single chip machine controlling circuit and display device are sequentially connected, 5v
The voltage source of regulated power supply is connected by wire with the feeder ear of a/d transducer, control single chip computer and display, simultaneously single
Piece machine control circuit is also electric with display device, voltage range switching circuit, crest voltage collection holding circuit and a/d conversion
Road connects；Software section is the operation sequence of single chip machine controlling circuit, by control mastery routine, data acquisition routines, number
According to process subprogram and display subroutine composition.
Embodiment illustrated in fig. 2 shows the voltage range switching circuit figure master of peak impulse voltage measurement of the present invention and display device
Cd4052 to be comprised double four selects a variable connector i 1, divider resistance 2, op07 operational amplifier 3 and cd4052 double four
Select a variable connector ii 4, cd4052 double four selects a variable connector i 1 to be used for blood pressure lowering, and cd4052 double four selects a variable connector
Ii 4 is used for voltage amplification, and its result is the needs making this part output voltage meet subsequent conditioning circuit, the selection of switch by
The low and high level of cpu respective pins determines；The effect of op07 operational amplifier 3 is: when the peak voltage signal mistake of input
Hour, select a variable connector ii 4 by switching cd4052 double four, it is different that op07 operational amplifier 3 can reach amplification
The effect of multiple.The connected mode of voltage range switching circuit is: peak voltage signal input selects one with cd4052 double four
Variable connector i 1 is connected, by cd4052 pair four signal selecting a variable connector i 1 to export after divider resistance 2 blood pressure lowering
Send into the input of op07 operational amplifier 3, cd4052 double four selects input and the op07 computing of a variable connector ii 4
The negative electrode of amplifier 3 is connected, and cd4052 double four selects a variable connector i 1 and cd4052 double four to select a variable connector ii's 4
Control end is connected with p2.4, p2.5 and p2.6 of 89c52 single-chip microcomputer, p2.7 respectively, peak voltage signal input
Select with cd4052 double four and be connected at the x0 of a variable connector i.
The effect of voltage range switching circuit is that the size according to tested voltage selects different ranges, and can be in single-chip microcomputer
The control of control circuit is lower automatically to be carried out suitable blood pressure lowering and carries out suitable amplification to tested low pressure to tested high pressure, meets
The needs of subsequent conditioning circuit, are entangled by controlling mastery routine to call corresponding subprogram that the voltage sampling signal of this part is compensated
Just, thus both reduced measurement error, played a protective role to prevent overtension from instrument is caused damage again.As when defeated
When entering voltage for 1000v, 89c52 single-chip microcomputer sends switch selection signal makes x with x3 connect, now according to resistance blood pressure lowering
Computing can be output as 1v, and this voltage meets subsequent voltage and requires, and now cd4052 double four selects a variable connector ii 4 to make
X0 with x connects, and directly exports this signal.When input voltage is for 20mv, cd4052 double four selects a variable connector i 1
X0 with x is made to connect, cd4052 double four selects a variable connector ii 4 so that x2 with x is connected, that is, constituting amplification is 100
Operational amplifier, output voltage be 2v, now also meet subsequent conditioning circuit requirement.
Embodiment illustrated in fig. 3 shows the crest voltage collection holding circuit of peak impulse voltage measurement of the present invention and display device
Figure is mainly made up of one piece of lf398 sampling holder and one piece of lm311 voltage comparator, and crest voltage gathers holding circuit
Connected mode be: input 3 pin of lf398 sampling holder and outfan 5 pin are connected on lm311 voltage respectively
Comparator positive and negative polarities, lm311 voltage comparator outfan and the logic control end 8 of lf398 sampling holder are drawn simultaneously
Foot is connected, and lm311 voltage comparator outfan is connected with r1 pull-up resistor again, and 6 pins of lf398 sampling holder lead to
The emitter stage crossing diode in4148 with audion 9013 is connected, the base stage of audion 9013 and 89c52 single-chip microcomputer
P1.5 is connected, and 6 pins of lf398 sampling holder are connected with voltage holding capacitor c1 simultaneously, voltage comparator lf398
1 pin and 4 pins be connected with power supply positive and negative pole, 2 pins of lf398 sampling holder are connected with phaser r2
Connect.The input voltage of wherein lf398 sampling holder is the output voltage of selective circuit of measuring range, lf398 sampling holder
Output voltage and input voltage compared by lm311 voltage comparator, when input voltage be more than output voltage when, lm311
Voltage comparator exports high level, delivers to 8 pins of lf398 sampling holder, so that lf398 sampling holder is in and adopt
Sample state, when input voltage is less than output voltage, lm311 voltage comparator exports low-voltage, so that lf398 is sampled and protects
Holder is in hold mode, send clear signal by p3.7, measurement is from the beginning of newly after the completion of sampling.
Embodiment illustrated in fig. 4 shows a/d change-over circuit in peak impulse voltage of the present invention measurement and display device by this figure
Sun7474 chip composition on the right of the adc0809 chip on the left side and this figure.When single-chip microcomputer 89c52 is to a/d transducer
Address input line add-a, add-b and add-c of 14th, 15 and 16 pin of adc0809 assignment 1,1,0 respectively
When, the analog input of gating in3.The analogue signal of the input in3 of chip adc08095 is turned by a/d change-over circuit
Be changed to digital signal, and export to single-chip microcomputer 89c52 single-chip microcomputer do next step process.
Embodiment illustrated in fig. 5 shows the composition electricity of the 5v regulated power supply in peak impulse voltage measurement of the present invention and display device
Route lm22676 chip, capacitor c1, capacitor c2, capacitor c3, capacitor c4, resistance r1, resistance r2、
Inductance l1With Zener diode d1Composition.Wherein, capacitor c1Positive pole and capacitor c2Positive pole be jointly connected on
On the 7th pin vin of lm22676, its negative pole is all grounded gnd, and vin connects high level；The 6th of lm22676 chip
Pin is grounded gnd, and the 5th pin en of lm22676 chip connects high level, and the 1st pin boot of lm22676 chip connects
The positive pole of capacitor c3, and the negative pole of c3 is met lm22676 chip the 8th pin sw and is grounded by stabilivolt d1, lm22676
Another termination inductance l of chip the 8th pin sw1One end, inductance l1The other end is through divider resistance r1With r2Series connection ground connection,
Inductance l simultaneously1The other end is connected with electric capacity c4 positive pole and is connected to the voltage output end of this power supply, another electric capacity c4Negative pole
Ground connection；Lm22676 chip the 4th pin fb is connected on resistance r1With resistance r2Intermediate contact on.So, resistance r1One
End output voltage is stable 5v voltage it is ensured that the stable work of this power distribution network low-voltage large-current magnetic field simulation display device
Make 5v voltage, its effect is to provide stable running voltage for a/d transducer, control single chip computer and display.Each electronics
The parameter of element is as follows: c1=22 μ f, c2=2.2 μ f, c3=10nf, c4=120 μ f, r1=4.7k ω, r2=0.828
K ω, l1=8.2 μ h, Zener diode d1It is the 1n4756 of 45v using voltage stabilizing value.This circuit is prior art.
Embodiment illustrated in fig. 6 shows that the display device in peak impulse voltage measurement of the present invention and display device constitutes circuit
Figure, wherein, display is connected with the pin of chip sr420561k by p0, p2 mouth of single-chip microcomputer and is constituted, show by
The measurement electric current Value Data that 89c52 single-chip microcomputer obtains after processing；The p0 of single-chip microcomputer includes p0.0～p0.7, respectively with chip
Pin a, b, c, d, e, f, g and dp of sr420561k connects；P2 includes p2.0～p2.3, passes through 500 respectively
ω resistance and audion are connected with pin s1, s2, s3 and s4 of chip sr420561k.
Embodiment illustrated in fig. 7 show single chip machine controlling circuit in peak impulse voltage of the present invention measurement and display device with aobvious
Showing device connection figure, wherein control single chip computer are the circuit diagram such as figure of 89c52 single-chip microcomputer, and 89c52 single-chip microcomputer is changed to by a/d
The incoming digital signal of device is processed, and digital signal passes through pin p1.0～p1.7 input, and the data obtaining after process is led to
Cross pin p0.0～p0.7 and be delivered to display.
Embodiment illustrated in fig. 8 shows the overall connection line figure of peak impulse voltage measurement of the present invention and display device, wherein
A dotted box portion is voltage range switching circuit, and b dotted box portion gathers holding circuit, c dotted line frame portion for crest voltage
It is divided into the adc0809 chip in a/d change-over circuit and sun7474 chip, d dotted box portion is single chip machine controlling circuit
In 89c52 single-chip microcomputer, e dotted box portion be mainly display device chips sr420561k；Integrated connection mode is electricity
The cd4052 double four of pressure range switch circuit selects the outfan of a variable connector ii 4 and crest voltage to gather holding circuit
The input of lf398 sampling holder connects, and crest voltage gathers the outfan of the lf398 sampling holder of holding circuit
Output sampled signal is connected with the input of the adc0809 chip in a/d change-over circuit, and 89c52 single-chip microcomputer is to adc0809
The address input line of chip carries out assignment, the input exporting as 89c52 single-chip microcomputer of adc0809 chip, sun7474
Chip is connected with the address latch port ale of adc0809 chip, the voltage source of 5v regulated power supply and a/d change-over circuit,
The feeder ear of 89c52 single-chip microcomputer and display device is connected by wire, 89c52 single-chip microcomputer also simultaneously with display device, voltage
Range switch circuit, crest voltage collection holding circuit and a/d change-over circuit connect.
Embodiment illustrated in fig. 9 shows the single chip machine controlling circuit operation journey of peak impulse voltage measurement of the present invention and display device
In sequence, control main program flow chart is: starts → initializes and input channel sets → call data acquisition routines → startup
Whether a/d conversion → a/d conversion terminates？→ n, returns and continues ad conversion；Y, calls data processing subprogram → tune
Set with display subroutine → return initialization and input channel.
Embodiment illustrated in fig. 10 shows the single chip machine controlling circuit operation of peak impulse voltage measurement of the present invention and display device
In program, data acquisition routines flow chart is: starts whether collection voltages → p3.7 is high voltage？Y → proceed to collection electricity
Road electric discharge → return and restart collection voltages；N → proceed to and compare whether input terminal voltage is more than output end voltage？Y → adopt
Collecting voltage；N → holding voltage → return restarts collection voltages.
Embodiment illustrated in fig. 11 shows the single chip machine controlling circuit operation of peak impulse voltage measurement of the present invention and display device
In program, data processing subroutine flow chart is: beginning → 89c52 initializes → inputs 8 ad transformation result → bis- and enters
System is converted to decimal scale bcd code → end.
Embodiment illustrated in fig. 12 shows the single chip machine controlling circuit operation of peak impulse voltage measurement of the present invention and display device
In program, display subroutine flow chart is: beginning → 89c52 initialization → Dynamic Announce initializes → send a word selection → look into section
Select table → section code selection feeding → time delay 1ms → sensing next buffering display unit → 4 whether to show to complete？→ n, shows
Show next bit → return Dynamic Announce initialization；Y → end.
Embodiment 1
Tested crest voltage is between 1mv～10mv.
Switch on power, 89c52 single-chip microcomputer is initialized, 1. voltage range switching circuit can automatically select in range
1mv～10mv, now the p2.4 and p2.5 pin of 89c52 single-chip microcomputer send low level, cd4052 double four selects a multichannel
The x0 and x of switch i 1 are joined directly together, p2.6 the and p2.7 pin of 89c52 single-chip microcomputer sends high level, and cd4052 is double
Four select the x of a variable connector ii 4 to be connected with x3, and cd4052 double four selects divider resistance 2 and the op07 of a variable connector ii 4
Realize to input voltage signal 1000 times of amplifications under operational amplifier 3 collective effect, the voltage signal after amplifying is sent into
Crest voltage gathers holding circuit, and the output voltage of lf398 sampling holder and input voltage pass through lm311 voltage ratio relatively
Device compares, and when input is more than output, lm311 voltage comparator exports high level, delivers to the 8 of lf398 sampling holder
Pin, makes lf398 sampling holder be in sample states, and when input is less than output, lm311 voltage comparator exports
Low-voltage, makes lf398 sampling holder be in hold mode.Now single-chip microcomputer calls control mastery routine, 89c52 monolithic
Machine initialized and input channel setting, its i/o mouth p3.4, p3.5 and p3.6 address to adc0809 chip
When input line add-a, add-b and add-c are entered as 1,1,0 respectively, the in3 analog quantity of gating adc0809 chip
Input, sun7474 chip is as the clk signal frequency generator of adc0809 chip.Adc0809 chip will input in3
Analogue signal be converted to the digital signal that 89c52 single-chip microcomputer can identify, 89c52 single-chip microcomputer pass through i/o mouth p0.0～
P0.7 receiving data, and call data processing subprogram that the data of collection is processed, call display subroutine to incite somebody to action simultaneously
Result is delivered to nixie display sr420561k chip by i/o mouth p0.0～p0.7, p2.0～p2.3.
Embodiment 2
Tested crest voltage is between more than 10mv to 100mv.
Switch on power, 89c52 single-chip microcomputer is initialized, 2. voltage range switching circuit can automatically select in range
10mv～100mv, now the p2.4 and p2.5 pin of 89c52 single-chip microcomputer send low level, control variable connector i 1
Middle x0 and x is joined directly together, and the p2.6 pin of 89c52 single-chip microcomputer sends high level, and p2.7 pin sends low level, control
In variable connector ii 4 processed, x is connected with x2, and cd4052 double four selects divider resistance 2 and the op07 of a variable connector ii 4
Realize under operational amplifier 3 collective effect outside to input voltage signal 100 times of amplifications, other operate and measurement process
With embodiment 1.
Embodiment 3
Tested crest voltage is between more than 100mv to 1v.
Switch on power, 89c52 single-chip microcomputer is initialized, 3. voltage range switching circuit can automatically select in range
100mv～1v, now the p2.4 and p2.5 pin of 89c52 single-chip microcomputer send low level, control in variable connector i 1
X0 is joined directly together with x, and the p2.6 of 89c52 single-chip microcomputer sends low level, and p2.7 pin sends high level, controls multichannel
In switch ii 4, x is connected with x1, and cd4052 double four selects divider resistance 2 and the op07 operation amplifier of a variable connector ii 4
Realize outside to input voltage signal 10 times of amplifications under device 3 collective effect, other operations and measurement process are with embodiment 1.
Embodiment 4
Tested crest voltage is between more than 1v to 10v.
Switch on power, 89c52 single-chip microcomputer is initialized, voltage range switching circuit can automatically select 4. 1v in range～
10v, now the p2.4 and p2.5 pin of 89c52 single-chip microcomputer send low level, control x0 and x in variable connector i 1
It is joined directly together, p2.6 the and p2.7 pin of 89c52 single-chip microcomputer sends low level, controls x and x0 in variable connector ii 4
Outside being joined directly together, other operations and measurement process are with embodiment 1.
Embodiment 5
Tested crest voltage is between more than 10v to 100v.
Switch on power, 89c52 single-chip microcomputer is initialized, 5. voltage range switching circuit can automatically select in range
10v～100v, now the p2.4 pin of 89c52 single-chip microcomputer send low level, p2.5 sends high level, controls multichannel to open
Close x0 in i 1 to be connected with x1,10 times of blood pressure lowerings, 89c52 single-chip microcomputer p2.6 and p2.7 are carried out to the voltage signal of input
Pin sends low level, and outside in control variable connector ii 4, x and x0 is joined directly together, other operations and measurement process are same
Embodiment 1.
Embodiment 6
Tested crest voltage is between more than 100v to 1000v.
Switch on power, 89c52 single-chip microcomputer is initialized, 6. voltage range switching circuit can automatically select in range
100v～1000v, now the p2.4 pin of 89c52 single-chip microcomputer send high level, p2.5 sends low level, controls multichannel
In switch i 1, x0 is connected with x2, carries out 100 times of blood pressure lowerings to the voltage signal of input, the p2.6 of 89c52 single-chip microcomputer with
P2.7 pin sends low level, and outside in control variable connector ii 4, x and x0 is joined directly together, other operate and measured
Journey is with embodiment 1.
In above-mentioned all embodiments, involved circuit, element and its connected mode are all the ordinary skills of the art
Known to personnel, used components and parts can pass through commercially available.
Claims (9)
1. peak impulse voltage measurement and display device it is characterised in that: be made up of hardware components and software section, wherein,
Described hardware components include voltage range switching circuit, crest voltage collection holding circuit, a/d change-over circuit, single-chip microcomputer
This six part of control circuit, display device and 5v regulated power supply；Described software section is the operation journey of single chip machine controlling circuit
Sequence, including control mastery routine, data acquisition routines, data processing subprogram and display subroutine；
Described voltage range switching circuit mainly selects variable connector i and ii, op07 operational amplifier by two cd4052 double four
Constitute with a divider resistance；Described crest voltage collection holding circuit is mainly by one piece of lf398 sampling holder and one piece
Lm311 voltage comparator is constituted；Described a/d change-over circuit is made up of adc0809 chip and sun7474 chip；Institute
State single chip machine controlling circuit and mainly adopt 89c52 single-chip microcomputer；Described display device is led numeral method device, its electricity
P0, p2 mouth of route 89c52 single-chip microcomputer and chip sr420561k composition；Peak impulse voltage measurement and display device are whole
Body connected mode is: the cd4052 of voltage range switching circuit double four selects outfan and the crest voltage of a variable connector ii
The input of the lf398 sampling holder of collection holding circuit connects, and crest voltage gathers the lf398 sampling of holding circuit
The outfan output sampled signal of keeper is connected with the input of the adc0809 chip in a/d change-over circuit, 89c52
Single-chip microcomputer carries out assignment to the address input line of adc0809 chip, and the output of adc0809 chip is as 89c52 single-chip microcomputer
Input, sun7474 chip is connected with the address latch port ale of adc0809 chip, the voltage source of 5v regulated power supply
It is connected by wire with the feeder ear of a/d change-over circuit, 89c52 single-chip microcomputer and display device, 89c52 single-chip microcomputer is also simultaneously
It is connected with display device, voltage range switching circuit, crest voltage collection holding circuit and a/d change-over circuit, thus connect
It is connected into the overall circuit of peak impulse voltage measurement and display device；The connected mode of described voltage range switching circuit is:
Peak voltage signal input selects a variable connector i to be connected with cd4052 double four, selects a variable connector i by cd4052 double four
The signal of output sends into the input of op07 operational amplifier after divider resistance blood pressure lowering, and cd4052 double four selects a multichannel
The input of switch ii is connected with the negative electrode of op07 operational amplifier, and cd4052 double four selects variable connector i and cd4052
Double four select the control end of a variable connector ii to be connected with p2.4, p2.5 and p2.6 of 89c52 single-chip microcomputer, p2.7 respectively；
The connected mode that described crest voltage gathers holding circuit is: input 3 pin of lf398 sampling holder and outfan 5
Pin is connected on lm311 voltage comparator positive and negative polarities respectively, and lm311 voltage comparator outfan and lf398 sample simultaneously
Logic control end 8 pin of keeper is connected, and lm311 voltage comparator outfan is connected with r1 pull-up resistor again, lf398
6 pins of sampling holder are connected with the emitter stage of audion 9013 by diode in4148, the base of audion 9013
Pole is connected with the p3.7 of 89c52 single-chip microcomputer, simultaneously 6 pins of lf398 sampling holder and voltage holding capacitor c1 phase
Even, 1 pin of voltage comparator lf398 and 4 pins are connected with power supply positive and negative pole, lf398 sampling holder
2 pins are connected with phaser r2, the input 5 pin output analogue signal of lf398 sampling holder.
2. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described have six
Individual measurement display gear is respectively as follows: 1mv～10mv, 10mv～100mv, 100mv～1v, 1v～10v, 10v～100v
With 100v～1000v.
3. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described 89c52 is mono-
The Embedded of piece machine has built-in random access memory ram and read only memory rom.
4. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described display device
In, the measurement electric current Value Data that display obtains after being processed by 89c52 single-chip microcomputer, the p0 of single-chip microcomputer includes p0.0～p0.7,
It is connected with pin a, b, c, d, e, f, g and dp of chip sr420561k respectively；P2 includes p2.0～p2.3,
Pass through 500 ω resistance respectively and audion is connected with pin s1, s2, s3 and s4 of chip sr420561k.
5. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described a/d turns
Change circuit to be made up of adc0809 chip and sun7474 chip.
6. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described control master
Program circuit is: starts → initializes and input channel sets → call data acquisition routines → startup a/d conversion
Whether → a/d conversion terminates？→ n, returns and continues ad conversion；Y, calls data processing subprogram → call display
Program → return initialization and input channel set.
7. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described data is adopted
Integrating subroutine flow is: whether starts collection voltages → p3.7 as high voltage？Y → proceed to Acquisition Circuit electric discharge → return weight
Newly start collection voltages；N → proceed to and compare whether input terminal voltage is more than output end voltage？Y → collection voltages；N → holding
Voltage → return restarts collection voltages.
8. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: at described data
Reason subroutine flow is: it is decimal scale that beginning → 89c52 initializes → input 8 ad transformation result → Binary Conversion
Bcd code → end.
9. according to claim 1 peak impulse voltage measurement and display device it is characterised in that: described display
Program circuit is: beginning → 89c52 initialization → Dynamic Announce initializes → send a word selection → look into Duan Xuanbiao → section code selection and send
Enter → whether time delay 1ms → sensing next buffering display unit → 4 show completes？→ n, shows next bit → return
Dynamic Announce initializes；Y → end.
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| CN108957103A (en) * | 2018-05-22 | 2018-12-07 | 梧州学院 | A method of the high precision peak detection for the small signal of high bandwidth |
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Application publication date: 20170118 |