CN202075334U - Peak voltage digital display meter - Google Patents
Peak voltage digital display meter Download PDFInfo
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- CN202075334U CN202075334U CN2011201917700U CN201120191770U CN202075334U CN 202075334 U CN202075334 U CN 202075334U CN 2011201917700 U CN2011201917700 U CN 2011201917700U CN 201120191770 U CN201120191770 U CN 201120191770U CN 202075334 U CN202075334 U CN 202075334U
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Abstract
The utility model provides a peak voltage digital display meter, and relates to a measuring device for a voltage pulse peak value. The peak voltage digital display meter comprises an automatic measuring range switching circuit, a peak voltage collection and keeping circuit, an A\D converting circuit and a master control circuit. The automatic measuring range switching circuit comprises a CD4052 double four-one multiway switch I, a CD4052 double four-one multiway switch II, an OP07 operational amplifier and a divider resistor. The peak voltage collection and keeping circuit comprises an LF 398 sampling retainer and an LM 311 voltage comparator. A 12-bit AD 574 chip is adopted by the A\D converting circuit. The master control circuit is composed of a keyboard input, a master processing chip and a display output module, wherein a 89C52 single-chip microcomputer is employed by the master processing chip, and the display output module comprises a digital display circuit and a digital display tube. The total peak voltage measuring scope of the peak voltage digital display meter is from 1mv to 1000V, and the measuring precision of the meter is high.
Description
Technical field
The technical solution of the utility model 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.
The utility model content
Technical problem to be solved in the utility model 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 utility model solves this technical problem the technical scheme that is adopted: the crest voltage digital display meter, mainly by range automatic switching circuit, crest voltage is gathered and holding circuit, A/D change-over circuit and governor circuit four parts constitute, wherein range automatic switching circuit mainly selects a multi-way switch I by CD4052 two four, CD4052 two four selects a multi-way switch II, OP07 operational amplifier and a divider resistance constitute, crest voltage collection and holding circuit mainly are made of a LF398 sampling holder and a LM311 voltage comparator, the A/D change-over circuit adopts 12 AD574 chip, governor circuit is imported by keyboard, main process chip and demonstration output module constitute, wherein main process chip adopts the 89C52 single-chip microcomputer, shows that output module comprises digital display circuit and digital display tube; The CD4052 of range automatic switching circuit two four selects the output terminal of a multi-way switch II to be connected with the input end of the LF398 sampling holder of crest voltage collection and holding circuit, the output terminal of the LF398 sampling holder of crest voltage collection and holding circuit is connected with the A/D change-over circuit, the A/D change-over circuit is connected according to the A/D convertor circuit pin pin corresponding with the 89C52 single-chip microcomputer with governor circuit, the keyboard input is connected to the 89C52 single-chip microcomputer, 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, are thus connected into the overall circuit of crest voltage digital display meter; The connected mode of above-mentioned range automatic switching circuit is: the peak voltage signal input selects a multi-way switch I to link to each other with CD4052 two four, by the input end of sending into the OP07 operational amplifier after the CD4052 pair of four signal process divider resistance step-downs of selecting a multi-way switch I to export, CD4052 two four selects the input end of a multi-way switch II to link to each other with the negative electrode of OP07 operational amplifier, and CD4052 two four selects a multi-way switch I to select the control end of a multi-way switch II to be connected with P1.3, P1.4 with P1.1, the P1.2 of 89C52 single-chip microcomputer respectively with CD4052 two four; The connected mode of above-mentioned crest voltage collection and holding circuit is: input end 3 pins and output terminal 5 pins of LF398 sampling holder are connected on LM311 voltage comparator positive and negative polarities respectively, LM311 voltage comparator output terminal links to each other with logic control end 8 pins of LF398 sampling holder simultaneously, LM311 voltage comparator output terminal links to each other with the P1 pull-up resistor again, 6 pins of LF398 sampling holder link to each other with the emitter 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.
Above-mentioned crest voltage digital display meter, described circuit and whole components and parts all are placed in the carton and crate, 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 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 described 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, described 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, described 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 are known, and used components and parts can be by commercially available.
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 finish? 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 1ms → sensing next one and cushion display unit → 6 and show and to finish? N → demonstration next bit → return is static to show initialization; Y → end.
The beneficial effects of the utility model are: the utility model crest voltage digital display meter is a kind of intelligent crest voltage digital display meter, select a multi-way switch I owing to being provided with at the utility model crest voltage digital display meter 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, the utility model crest voltage digital display meter can be selected range automatically according to the size of measured crest voltage for this reason, 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 by 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 outstanding substantive distinguishing features of the utility model in the following example.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the formation schematic block diagram of the utility model crest voltage digital display meter.
Fig. 2 is the range automatic switching circuit figure of the utility model crest voltage digital display meter.
Fig. 3 is the crest voltage collection and the holding circuit figure of the utility model crest voltage digital display meter.
Fig. 4 is the A/D change-over circuit figure of the utility model crest voltage digital display meter.
Fig. 5 is the master control and the digital display circuit figure of the utility model crest voltage digital display meter.
Fig. 6 is the overall connection line figure of the utility model crest voltage digital display meter.
Fig. 7 is the main program flow chart of the utility model crest voltage digital display meter.
Fig. 8 is the interrupt routine process flow diagram of the utility model crest voltage digital display meter.
Fig. 9 is the data acquisition subroutine flow chart of the utility model crest voltage digital display meter.
Figure 10 is the display subroutine process flow diagram of the utility model crest voltage digital display meter.
Figure 11 is the profile view of the utility model crest voltage digital display meter.
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 the utility model crest voltage digital display meter embodiment illustrated in fig. 1 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 the utility model crest voltage digital display meter 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) by 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 couples 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) that X2 and X are connected, and 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 the utility model crest voltage digital display meter 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 end 3 pins and output terminal 5 pins of LF398 sampling holder are connected on LM311 voltage comparator positive and negative polarities respectively, LM311 voltage comparator output terminal links to each other with logic control end 8 pins of LF398 sampling holder simultaneously, LM311 voltage comparator output terminal links to each other with the R1 pull-up resistor again, 6 pins of LF398 sampling holder link to each other with the emitter 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, send clear signal by P1.5 after sampling is finished, measure from newly.
Adopted 12 AD574 chip among the A/D change-over circuit figure that shows the utility model crest voltage digital display meter embodiment illustrated in fig. 4, have conversion accuracy up to 0.05% and slewing rate reach the characteristics of 25 μ s soon.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 the utility model crest voltage digital display meter embodiment illustrated in fig. 5, governor circuit is the core of the utility model crest voltage digital display meter, 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 the utility model crest voltage digital display meter 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 terminal of a multi-way switch II to be connected with crest voltage collection and holding circuit, the output terminal 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.
The input end of range automatic switching circuit is sent in the peak voltage signal input, 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 signal of input satisfies the needs of subsequent conditioning circuit, the output terminal of range automatic switching circuit links to each other respectively at the LF398 sampling holder input end and the LM311 voltage comparator anode input end 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 digital 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 processing subroutine 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 the utility model crest voltage digital display meter that shows embodiment illustrated in fig. 7: program initialization → open interruption → measurement to finish? 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, determine suitable range by the look-at-me that keyboard produces, 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, this crest voltage is converted to 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 the utility model crest voltage digital display meter 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 responds the button interruption respectively and AD interrupts.Wherein T0 is interrupt register TO position.
Is the data acquisition subroutine flow process of the utility model crest voltage digital display meter 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 the utility model crest voltage digital display meter 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 1ms → sensing next one and cushion display unit → 6 and show and to finish? N → demonstration next bit → return is static to show initialization; Y → end.
The profile that shows the utility model crest voltage digital display meter 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 part display (7), be positioned at the power switch (8) of carton and crate header board (5) lower left quarter and be positioned at 6 range selection buttons (9) of carton and crate header board (5) bottom.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 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.
Tested crest voltage is between 1mv～10mV.
Press power switch (8), energized, the 89C52 single-chip microcomputer carries out initialization, range automatic switching circuit can be selected the 1. 1mv～10mv 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, CD4052 two four selects the X0 of a multi-way switch I (1) directly to link to each other with X, the P1.3 of 89C52 single-chip microcomputer and P1.4 pin send high level, CD4052 two four selects the X of a multi-way switch II (2) to link to each other with X3, CD4052 two four selects divider resistance (3) and the following 1000 times of amplifications that realize input voltage signal of OP07 operational amplifier (4) acting in conjunction of a multi-way switch II (2), voltage signal after amplifying is sent into crest voltage collection and holding circuit, the output voltage of LF398 sampling holder and input voltage are by the LM311 voltage comparator relatively, when importing greater than output, LM311 voltage comparator output high level, deliver to 8 pins of LF398 sampling holder, make the LF398 sampling holder be in sample states, when importing less than output, LM311 voltage comparator output LOW voltage makes the LF398 sampling holder be in hold mode.This moment, single-chip microcomputer called interruption subroutine, control A/D opens interruption, and the crest voltage that keeps sent into A/D convertor circuit, be converted into the digital signal that the 89C52 single-chip microcomputer can be discerned, the 89C52 single-chip microcomputer receives data by the I/O mouth, and call the data processing subroutine data of gathering are handled, store data the back that disposes, and calls display subroutine simultaneously the data that the record display (7) by six figure place sign indicating numbers is shown.
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, CD4052 two four selects the middle X0 of a multi-way switch I (1) directly to link to each other with X, the P1.3 pin of 89C52 single-chip microcomputer sends high level, the P1.4 pin sends low level, CD4052 two four selects the middle X of a multi-way switch II (2) to link to each other with X2, CD4052 two four selects outside the divider resistance (3) and the following 100 times of amplifications that realize input voltage signal of OP07 operational amplifier (4) acting in conjunction of a multi-way switch II (2), and 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, CD4052 two four selects the middle X0 of a multi-way switch I (1) directly to link to each other with X, the P1.3 of 89C52 single-chip microcomputer sends low level, the P1.4 pin sends high level, CD4052 two four selects the middle X of a multi-way switch II (2) to link to each other with X1, CD4052 two four selects outside the divider resistance (3) and the following 10 times of amplifications that realize input voltage signal of OP07 operational amplifier (4) acting in conjunction of a multi-way switch II (2), and 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 P2.2 pin of 89C52 single-chip microcomputer sent low level, and CD4052 two four selects the middle X0 of a multi-way switch I (1) directly to link to each other with X, and the P1.3 of 89C52 single-chip microcomputer and P1.4 pin send low level, outside CD4052 two four selected the middle X of a multi-way switch II (2) and X0 directly links to each other, other operations and measuring process were 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, CD4052 two four selects the middle X0 of a multi-way switch I (1) to link to each other with X1, voltage signal to input carries out 10 times of step-downs, 89C52 single-chip microcomputer P1.3 and P1.4 pin send low level, outside CD4052 two four selects among the multi-way switch II (2) X and X0 directly links to each other, 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, CD4052 two four selects the middle X0 of a multi-way switch I (1) to link to each other with X2, 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, outside CD4052 two four selected the middle X of a multi-way switch II (2) and X0 directly links to each other, other operations and measuring process were with embodiment 1.
Involved circuit, element and connected mode thereof all is that those skilled in the art are known among above-mentioned all embodiment, and used components and parts can be by commercially available.
Claims (5)
1. crest voltage digital display meter, it is characterized in that: mainly by range automatic switching circuit, crest voltage is gathered and holding circuit, A/D change-over circuit and governor circuit four parts constitute, wherein range automatic switching circuit mainly selects a multi-way switch I by CD4052 two four, CD4052 two four selects a multi-way switch II, OP07 operational amplifier and a divider resistance constitute, crest voltage collection and holding circuit mainly are made of a LF398 sampling holder and a LM311 voltage comparator, the A/D change-over circuit adopts 12 AD574 chip, governor circuit is imported by keyboard, main process chip and demonstration output module constitute, wherein main process chip adopts the 89C52 single-chip microcomputer, shows that output module comprises digital display circuit and digital display tube; The CD4052 of range automatic switching circuit two four selects the output terminal of a multi-way switch II to be connected with the input end of the LF398 sampling holder of crest voltage collection and holding circuit, the output terminal of the LF398 sampling holder of crest voltage collection and holding circuit is connected with the A/D change-over circuit, the A/D change-over circuit is connected according to the A/D convertor circuit pin pin corresponding with the 89C52 single-chip microcomputer with governor circuit, the keyboard input is connected to the 89C52 single-chip microcomputer, 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, are thus connected into the overall circuit of crest voltage digital display meter; The connected mode of above-mentioned range automatic switching circuit is: the peak voltage signal input selects a multi-way switch I to link to each other with CD4052 two four, by the input end of sending into the OP07 operational amplifier after the CD4052 pair of four signal process divider resistance step-downs of selecting a multi-way switch I to export, CD4052 two four selects the input end of a multi-way switch II to link to each other with the negative electrode of OP07 operational amplifier, and CD4052 two four selects a multi-way switch I to select the control end of a multi-way switch II to be connected with P1.3, P1.4 with P1.1, the P1.2 of 89C52 single-chip microcomputer respectively with CD4052 two four; The connected mode of above-mentioned crest voltage collection and holding circuit is: input end 3 pins and output terminal 5 pins of LF398 sampling holder are connected on LM311 voltage comparator positive and negative polarities respectively, LM311 voltage comparator output terminal links to each other with logic control end 8 pins of LF398 sampling holder simultaneously, LM311 voltage comparator output terminal links to each other with the R1 pull-up resistor again, 6 pins of LF398 sampling holder link to each other with the emitter 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.
2. according to the described crest voltage digital display meter of claim 1, it is characterized in that: described circuit and whole components and parts all are placed in the carton and crate, 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 are that 110mm and thickness are 56mm.
3. according to the described crest voltage digital display meter of claim 2, it is characterized in that: described 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 described crest voltage digital display meter of claim 1, it is characterized in that: the chip integration of described 89C52 single-chip microcomputer becomes to have built-in random access memory ram and read only memory ROM.
5. according to the described crest voltage digital display meter of claim 1, it is characterized in that: described digital display tube is made up of 6 LED.
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| CN2011201917700U CN202075334U (en) | 2011-06-09 | 2011-06-09 | Peak voltage digital display meter |
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| CN2011201917700U CN202075334U (en) | 2011-06-09 | 2011-06-09 | Peak voltage digital display meter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353830A (en) * | 2011-06-09 | 2012-02-15 | 河北工业大学 | Peak voltage digital display meter |
| CN102611426A (en) * | 2012-03-23 | 2012-07-25 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN103323638A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Multifunctional digital scope meter |
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
| CN105952571A (en) * | 2016-04-26 | 2016-09-21 | 马骏 | Novel hydraulic generator based on Internet of Things |
| CN109633231A (en) * | 2018-12-29 | 2019-04-16 | 中国电子科技集团公司第十二研究所 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
| CN111398844A (en) * | 2020-03-10 | 2020-07-10 | 深圳供电局有限公司 | Ripple peak sampling circuit and direct current system monitoring device |
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2011
- 2011-06-09 CN CN2011201917700U patent/CN202075334U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353830A (en) * | 2011-06-09 | 2012-02-15 | 河北工业大学 | Peak voltage digital display meter |
| CN102611426A (en) * | 2012-03-23 | 2012-07-25 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN102611426B (en) * | 2012-03-23 | 2014-11-05 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN103323638A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Multifunctional digital scope meter |
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
| CN105952571A (en) * | 2016-04-26 | 2016-09-21 | 马骏 | Novel hydraulic generator based on Internet of Things |
| CN109633231A (en) * | 2018-12-29 | 2019-04-16 | 中国电子科技集团公司第十二研究所 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
| CN111398844A (en) * | 2020-03-10 | 2020-07-10 | 深圳供电局有限公司 | Ripple peak sampling circuit and direct current system monitoring device |
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