CN108509178A - A kind of analog voltage divider circuit - Google Patents
A kind of analog voltage divider circuit Download PDFInfo
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- CN108509178A CN108509178A CN201810181138.4A CN201810181138A CN108509178A CN 108509178 A CN108509178 A CN 108509178A CN 201810181138 A CN201810181138 A CN 201810181138A CN 108509178 A CN108509178 A CN 108509178A
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- scale value
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
- G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
- G06F7/52—Multiplying; Dividing
- G06F7/535—Dividing only
Abstract
The invention discloses it is a kind of including ratio value computing unit, analog result output unit analog voltage divider circuit, its core is parallel A/D converter and parallel D/A converter, for calculating the ratio value between two input voltages and simultaneously the ratio value result of output digit signals form and the ratio value result of analog signal form.Described device is of less demanding for comparative example value calculating speed, and two input voltages change shallower occasion.
Description
Present patent application is divisional application, and application No. is 201610000413.9, the applying date is on January 4th, 2016 for original bill,
The entitled device for seeking ratio value between two input voltages.
Technical field
The present invention relates to a kind of analog operational circuit, especially a kind of analog voltage divider circuit.
Background technology
Conventional analog divider can realize that the division arithmetic between analog voltage, operation result output are equally simulations
Signal cannot export the digital signal and analog signal of reflection operation result simultaneously.
Invention content
The purpose of the present invention is the division arithmetics between analog voltage to provide a solution, can calculate two
Between input voltage ratio value and simultaneously output digit signals and analog signal operation result circuit.
To achieve the goals above, include ratio value computing unit, analog result output unit the present invention provides one kind
Analog voltage divider circuit.
The ratio value computing unit is equipped with molecule voltage input end, denominator voltage input end and digital ratio value output
End.
The ratio value computing unit includes parallel A/D converter；The parallel A/D converter is inputted with analog voltage
End, reference voltage input terminal and parallel data output end；The parallel A/D converter is operated in automatic continuous translative mode.
The analog voltage input of the parallel A/D converter is the molecule voltage input end of ratio value computing unit, ginseng
The denominator voltage input end that voltage input end is ratio value computing unit is examined, parallel data output end is ratio value computing unit
Numerical scale value output end.
The analog result output unit is equipped with numerical scale value input terminal, scale factor voltage input end and analog voltage
Ratio value output end；The numerical scale value input terminal is connected to the numerical scale value output end of ratio value computing unit.
The core of the analog result output unit is parallel D/A converter；The parallel D/A converter has and line number
According to input terminal, reference voltage input and conversion voltage output end；The parallel data input terminal of the parallel D/A converter is mould
The numerical scale value input terminal of quasi- result output unit, reference voltage input are scale factor voltage input end, convert voltage
Output end is analog voltage ratio value output end；The numerical scale value of the numerical scale value output end output and digital ratio value
The numerical scale value of input terminal input is binary number.
The binary digit digit of the numerical scale value output end is equal to the binary digit digit of numerical scale value input terminal,
The binary digit of numerical scale value input terminal is sequentially connected with the binary digit of numerical scale value output end；Either, the number
The binary digit digit of word ratio value output end is more than the binary digit digit of numerical scale value input terminal, the output of numerical scale value
The low level binary digit having more is held to be not attached to numerical scale value input terminal, by the binary digit and number of numerical scale value input terminal
The binary digit of the high-order corresponding digit of word ratio value output end is sequentially connected；Either, the two of the numerical scale value output end
System position digit is less than the binary digit digit of numerical scale value input terminal, the low level binary system that numerical scale value input terminal has more
Position is connected to low level, by the binary digit of numerical scale value output end and the two of the high-order corresponding digit of numerical scale value input terminal
System position is sequentially connected.
If the molecule voltage of input is U1, denominator voltage is U2；Numerical scale value output end output numerical scale value be
The maximum value of Z, Z are Zmax；The scale factor voltage of scale factor voltage input end input is UK；Analog voltage ratio value exports
The analog voltage ratio value of end output is U0；Then have
The parallel A/D converter reference voltage input terminal allows the reference voltage range of input than denominator control source
The wide input voltage range at end.The molecule voltage and denominator voltage are all positive voltages, and molecule voltage is less than or equal to denominator electricity
Pressure.
The parallel A/D converter is operated in the mode of automatic continuous translative mode, including parallel A/D converter is arranged
In automatic continuous translative mode, or by the restarting of parallel A/D converter conversion end signal, A/D is converted next time, or
Person is to control parallel A/D converter by the recurrent pulse additionally generated to carry out A/D conversions.
The parallel D/A converter is in direct D/A transition status.
The analog voltage divider circuit further includes input voltage sequencing unit.The input voltage sequencing unit is equipped with
First input voltage input terminal, the second input voltage input terminal, molecule voltage output end, denominator voltage output end and size compare
As a result output end.The molecule voltage output end, denominator voltage output end are respectively connected to the molecule electricity of ratio value computing unit
Press input terminal, denominator voltage input end.
When the first input voltage amplitude is more than the second input voltage, the denominator voltage of input voltage sequencing unit output
Equal to the first input voltage, molecule voltage is equal to the second input voltage；The first input voltage amplitude is less than the second input electricity
When pressure, the denominator voltage of input voltage sequencing unit output is equal to the second input voltage, and molecule voltage is equal to the first input voltage.
First input voltage and the second input voltage are all positive voltages.The parallel A/D converter reference voltage input terminal allows
The reference voltage range of input is all wider than the range of the first input voltage and the second input voltage.The size comparison result is defeated
Outlet output size comparison result in the form of switching value.The form of the switching value is high and low level.
The input voltage sequencing unit is made of binary channels two-way analog switch and comparator；The comparator pair first
Input voltage, the second input voltage amplitude size be compared；The size of the size comparison result output end output compares
As a result it is controlled by the output of comparator；The channel selecting of the binary channels two-way analog switch is controlled by the output of comparator.
The invention has the advantages that the ratio value between two input voltages is sought automatically, and simultaneously with digital signal
It is exported with the form of analog signal.
Description of the drawings
Fig. 1 is a kind of structure diagram for seeking the device of ratio value between two input voltages.
Fig. 2 is the embodiment 1 of ratio value computing unit 100.
Fig. 3 is the embodiment 2 of ratio value computing unit 100.
Fig. 4 is the embodiment 3 of ratio value computing unit 100.
Fig. 5 is the embodiment 1 of analog result output unit 200.
Fig. 6 is the embodiment 2 of analog result output unit 200.
Fig. 7 is 300 embodiment of input voltage sequencing unit.
Specific implementation mode
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
It is a kind of to ask the structure diagram of the device of ratio value between two input voltages as shown in Figure 1, by ratio value computing unit
100, analog result output unit 200 and input voltage sequencing unit 300 form.
The core of ratio value computing unit 100 is parallel A/D converter, is equipped with molecule voltage input end VIN, denominator voltage
Input terminal REF and number ratio value output end DB OUT.
The parallel A/D converter has analog voltage input, reference voltage input terminal and parallel data output end, work
Make in automatic continuous translative mode.The analog voltage input is the molecule voltage input end of ratio value computing unit 100
VIN, reference voltage input terminal are the denominator voltage input end REF of ratio value computing unit 100, and parallel data output end is ratio
It is worth the numerical scale value output end DB OUT of computing unit 100.
The embodiment 1 of ratio value computing unit 100 is as shown in Fig. 2, by parallel A/D converter 101, resistance 102, capacitance
103, it is formed with door 104.The model of parallel A/D converter 101 is 8 parallel-by-bit A/D converter ADC0841.The simulation of ADC0841
Voltage input end is VIN+, and reference voltage input terminal VREF, 8 bit parallel data output ends are DB7~DB0.The WR of ADC0841
To start conversion inputs, negative pulse is effective；WR is connected to the output end with door 104；With one of door 104 input be connected to by
Resistance 102, capacitance 103 form power on pulse output end, another input be connected to ADC0841 conversion end signal it is defeated
Outlet INTR；When powering on, ADC0841 is started by upper electric pulse and carries out the conversion of first time A/D, after A/D conversion ends, INTR outputs
Negative pulse start ADC0841 and carry out new A/D conversions, in cycles, ADC0841 is operated in automatic continuous modulus of conversion
Formula.
The analog voltage input negative terminal VIN- of ADC0841, output Enable Pin RD, chip select terminal CS, digitally DGND, simulation ground
AGND is connected to publicly, and the power end VCC of ADC0841 is connected to power supply+VDD.The output Enable Pin RD inputs of ADC0841 are low
When level, data output end DB7~DB0 maintains output effective.After ADC0841 conversion ends each time, automatically by result
It is exported from data output end DB7~DB0.
If the voltage for being connected to molecule voltage input end VIN is U1, being connected to the voltage of denominator voltage input end REF is
The digital signal of U2, numerical scale value output end DB OUT outputs is Z.In the embodiment 1 of ratio value computing unit 100, Z is number
It is 255 according to z7~z0 of output end DB7~DB0 outputs, maximum value Zmax.Then have
Ratio value i.e. between two input voltages U1, U2 is
The embodiment 2 of ratio value computing unit 100 is as shown in figure 3, by parallel A/D converter 111,555 time base apparatus parts
112, resistance 113, resistance 114, capacitance 115 form.The model of parallel A/D converter 111 is 8 parallel-by-bit A/D converters
ADC0841.The embodiment 2 of ratio value computing unit 100 and the embodiment 1 of ratio value computing unit 100 the difference is that,
Oscillator is formed by 555 time base apparatus parts 112, resistance 113, resistance 114, capacitance 115, the recurrent pulse of oscillator output is connected to
The startup conversion inputs WR of A/D converter 111, each pulse start an A/D conversion, A/D converter 111 are made to be operated in
Automatic continuous translative mode.The reality of the other parts and ratio value computing unit 100 of the embodiment 2 of ratio value computing unit 100
Apply that example is identical, the ratio value between two input voltages U1, U2 is
The embodiment 3 of ratio value computing unit 100 is as shown in figure 4, by parallel A/D converter 121,555 time base apparatus parts
122, resistance 123, resistance 124, capacitance 125 form.The model of parallel A/D converter 121 is 12 parallel-by-bit A/D converters
AD7492.The analog voltage input of AD7492 is VIN, and reference voltage input terminal is REF IN, 12 bit parallel data output ends
For DB11~DB0.The CONVST of AD7492 is to start conversion inputs, and failing edge starts A/D conversions.555 time base apparatus parts
122, resistance 123, resistance 124, capacitance 125 form oscillator, and the recurrent pulse of oscillator output is connected to A/D converter 121
Startup conversion inputs CONVST, each pulse starts A/D conversion, A/D converter 121 made to be operated in automatically continuously
Translative mode.
The output Enable Pin RD of AD7492, chip select terminal CS, suspend mode selection end PS/FS, digitally DGND, simulation ground
AGND is connected to publicly, and analog power end AVDD, the digital power end DVDD of AD7492 are connected to power supply+VDD.AD7492's
When exporting Enable Pin RD input low levels, data output end DB11~DB0 maintains output effective.When AD7492 is converted each time
After, result is exported from data output end DB11~DB0 automatically.
In the embodiment 3 of ratio value computing unit 100, Z is z11~z0 of data output end DB11~DB0 outputs, most
Big value Zmax is 4095.Then have
Ratio value i.e. between two input voltages U1, U2 is
Parallel A/D converter reference voltage input terminal allows the reference voltage of input in the ratio value computing unit 100
Range is wider than the input voltage U2 ranges for being connected to 100 denominator voltage input end REF of ratio value computing unit.
Used by the parallel A/D converter in above-mentioned 3 embodiments automatically continuously in addition to translative mode, when it is selected simultaneously
When row A/D converter can be operated in automatic continuous translative mode by setting, preferably parallel A/D is set to convert by set-up mode
Device is operated in automatic continuous translative mode.
The core of analog result output unit 200 is parallel D/A converter, is equipped with numerical scale value input terminal DB IN, ratio
Example factor voltage input end VIN3 and analog voltage ratio value output end VOUT.The numerical scale value input terminal DB IN connections
To the numerical scale value output end DB OUT of ratio value computing unit 100.
The parallel D/A converter has parallel data input terminal, reference voltage input and conversion voltage output end.Institute
The numerical scale value input terminal DB IN that parallel data input terminal is analog result output unit 200 are stated, reference voltage input is
The scale factor voltage input end VIN3 of analog result output unit 200, converts voltage output end as analog result output unit
200 analog voltage ratio value output end VOUT.
The embodiment 1 of analog result output unit 200 parallel D/A converter 201 as shown in figure 5, be made of, parallel D/A
The model of converter 201 is 8 parallel-by-bit D/A converter AD5330.The parallel data input terminal of AD5330 is DB7~DB0, benchmark
Voltage input end is VREF, converts voltage output end as VOUT.
The buffer switch control terminal BUF of AD5330, export ratio control terminal GAIN, input register control terminal WR, DAC
Register control terminal LDAC, chip select terminal CS, ground terminal GND are connected to publicly, the clear terminal CLR of AD5330, low power consumption control end
PD, power end VDD are connected to power supply+VDD.The input register control terminal WR and DAC register control terminal LDAC of AD5330 is defeated
When entering low level, it is in direct D/A transition status, when not considering transfer lag, conversion voltage output end VOUT reflections in real time are simultaneously
The data conversion result of row data input pin DB7~DB0.
If the voltage for being connected to scale factor voltage input end VIN3 is UK, the VOUT outputs of analog voltage ratio value output end
Voltage be U0, the data of parallel data input terminal DB7~DB0 inputs are Z, i.e. 8 z7~z0, maximum value Zmax1 are
255, then have
When Zmax1 is equal with Zmax, have
When UK being taken to be equal to 1V, have
Obviously, if analog result output unit 200 uses embodiment 1, ratio value computing unit 100 is using implementation
When example 1 or embodiment 2, Zmax1 is equal with Zmax.If analog result output unit 200 uses embodiment 1, ratio value
When the use embodiment 3 of computing unit 100, to make Zmax1 equal with Zmax, then it should 100 reality of selection percentage value computing unit
The most-significant byte applied in the 12-bit data of the numerical scale value output end DB OUT output ends output of example 3 exports list as analog result
The numerical scale value input terminal DB IN signals of first 200 embodiments 1.
The embodiment 2 of analog result output unit 200 parallel D/A converter 211 as shown in fig. 6, be made of, parallel D/A
The model of converter 211 is 12 parallel-by-bit D/A converter AD5340.The parallel data input terminal of AD5340 is DB11~DB0, base
Quasi- voltage input end is VREF, converts voltage output end as VOUT.
The buffer switch control terminal BUF of AD5340, export ratio control terminal GAIN, input register control terminal WR, DAC
Register control terminal LDAC, chip select terminal CS, ground terminal GND are connected to publicly, the clear terminal CLR of AD5340, low power consumption control end
PD, power end VDD are connected to power supply+VDD.The input register control terminal WR and DAC register control terminal LDAC of AD5340 is defeated
When entering low level, it is in direct D/A transition status, when not considering transfer lag, conversion voltage output end VOUT reflections in real time are simultaneously
The data conversion result of row data input pin DB11~DB0.
If the voltage for being connected to scale factor voltage input end VIN3 is UK, the VOUT outputs of analog voltage ratio value output end
Voltage be U0, the data of parallel data input terminal DB11~DB0 inputs are Z, i.e. 12 z11~z0, maximum value Zmax1
It is 4095, then has
When Zmax1 is equal with Zmax, have
When UK being taken to be equal to 1V, have
Obviously, if analog result output unit 200 uses embodiment 2, ratio value computing unit 100 is using implementation
When example 3, Zmax1 is equal with Zmax.If analog result output unit 200 uses embodiment 2, ratio value computing unit 100
When using embodiment 1 or embodiment 2, to make Zmax1 equal with Zmax, then it should be by 8 of ratio value computing unit 100
Numerical scale Value Data is connected to the most-significant byte in 12 bit digital ratio value input terminals of analog result output unit 200, simulation knot
Low 4 in 12 bit digital ratio value input terminals of fruit output unit 200 are connected to publicly.
In 3 embodiments of the ratio value computing unit 100 and 2 embodiments of analog result output unit 200, number
The data of word ratio value output end DB OUT and number ratio value input terminal DB IN are binary data.The molecule voltage
The voltage U2 of the voltage U1 and denominator voltage input end REF of input terminal VIN are positive voltage, and U1 is less than or equal to U2.
The effect of input voltage sequencing unit 300 is to treat two positive input voltages for seeking ratio value, i.e., the first input electricity
The amplitude size of UA, the second input voltage UB is pressed to be compared, using the larger voltage of wherein amplitude as denominator voltage input end
The smaller voltage of the voltage U2 of REF, amplitude is connected to ratio value computing unit as the voltage U1 of molecule voltage input end VIN
100, while comparison result being exported in the form of switching value.
300 embodiment of input voltage sequencing unit is as shown in fig. 7, by binary channels two-way analog switch 301, comparator 302
Composition.Binary channels two-way analog switch 301 select double 4 select one multiway analog switch CD4052.
Comparator 302 is compared the amplitude size of the first input voltage UA, the second input voltage UB, size switch letter
The effect one of number SW1 is to be exported in the form of switching value as comparative result, is acted on second is that being connected to the channel selecting of CD4052
Hold A.The channel selecting end B of CD4052, enabled input terminal INH, digitally VSS, simulation ground VEE are connected to publicly, CD4052
VDD be connected to power supply+VDD.
UA>When UB, size switch signal SW1 exports low level；The output X selection connection X0 of CD4052, output Y selections connect
Logical Y0, i.e. U1=X=X0=UB, U2=Y=Y0=UA；Meet U1<U2.
UA<When UB, size switch signal SW1 exports high level；The output X selection connection X1 of CD4052, output Y selections connect
Logical Y1, i.e. U1=X=X1=UA, U2=Y=Y1=UB；Meet U1<U2.
Therefore, work as UA>When UB, have
UA<When UB, have
When UA=UB, no matter SW1 is high level or low level, has U1=U2, so having
Size switch signal SW1 is exported in the form of switching value as comparative result, and the form of switching value is except above-mentioned
Outside high and low level, the NPN triode of open collector, open collector can also be increased after size switch signal SW1
The circuit of the diversified forms such as PNP triode, relay obtains the switching value exported in the form of normally opened, normally closed switch etc..
Described device is for of less demanding to voltage ratio value calculating speed, and the occasion that voltage change is shallower.
Example the above is only the implementation of the present invention is not intended to restrict the invention, and those skilled in the art is come
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any modification made by is equal
Replace, improve etc., it should be included within scope of the presently claimed invention.
Claims (9)
1. a kind of analog voltage divider circuit, it is characterised in that：
Including ratio value computing unit, analog result output unit；
The ratio value computing unit is equipped with molecule voltage input end, denominator voltage input end and digital ratio value output end；
The ratio value computing unit includes parallel A/D converter；The parallel A/D converter have analog voltage input,
Reference voltage input terminal and parallel data output end；The parallel A/D converter is operated in automatic continuous translative mode；
The analog voltage input of the parallel A/D converter is the molecule voltage input end of ratio value computing unit, with reference to electricity
It is the denominator voltage input end of ratio value computing unit to press input terminal, and parallel data output end is the number of ratio value computing unit
Ratio value output end；
The analog result output unit is equipped with numerical scale value input terminal, scale factor voltage input end and analog voltage ratio
It is worth output end；The numerical scale value input terminal is connected to the numerical scale value output end of ratio value computing unit；
The core of the analog result output unit is parallel D/A converter；The parallel D/A converter has parallel data defeated
Enter end, reference voltage input and conversion voltage output end；The parallel data input terminal of the parallel D/A converter is that simulation is tied
The numerical scale value input terminal of fruit output unit, reference voltage input are scale factor voltage input end, convert voltage output
End is analog voltage ratio value output end；
The numerical scale value of the numerical scale value output end output and the numerical scale value of digital ratio value input terminal input are equal
For binary number.
2. a kind of analog voltage divider circuit as described in claim 1, it is characterised in that：The numerical scale value output end
Binary digit digit be equal to numerical scale value input terminal binary digit digit, the binary digit of numerical scale value input terminal with
The binary digit of numerical scale value output end is sequentially connected.
3. a kind of analog voltage divider circuit as described in claim 1, it is characterised in that：The numerical scale value output end
Binary digit digit be more than numerical scale value input terminal binary digit digit, the low level two that numerical scale value output end has more
System position is not attached to numerical scale value input terminal, by the binary digit of numerical scale value input terminal and numerical scale value output end
The binary digit of high-order corresponding digit is sequentially connected.
4. a kind of analog voltage divider circuit as described in claim 1, it is characterised in that：The numerical scale value output end
Binary digit digit be less than numerical scale value input terminal binary digit digit, the low level two that numerical scale value input terminal has more
System position is connected to low level, by the binary digit of numerical scale value output end and the high-order corresponding digit of numerical scale value input terminal
Binary digit be sequentially connected.
5. a kind of analog voltage divider circuit of any one as described in claim 2-4, it is characterised in that：If point of input
Sub- voltage is U1, and denominator voltage is U2；The numerical scale value of numerical scale value output end output is Z, and the maximum value of Z is Zmax；
The scale factor voltage of scale factor voltage input end input is UK；The analog voltage ratio of analog voltage ratio value output end output
Example value is U0；Then have
6. a kind of analog voltage divider circuit as claimed in claim 5, it is characterised in that：The parallel A/D converter ginseng
Examining voltage input end allows the reference voltage range of input than the wide input voltage range of denominator voltage input end.
7. a kind of analog voltage divider circuit as claimed in claim 5, it is characterised in that：The molecule voltage and denominator electricity
Pressure is all positive voltage, and molecule voltage is less than or equal to denominator voltage.
8. a kind of analog voltage divider circuit as described in claim 1, it is characterised in that：The parallel A/D converter work
Make the mode in automatic continuous translative mode, including parallel A/D converter is arranged in automatic continuous translative mode, or by
A/D is converted next time for parallel A/D converter conversion end signal restarting, or the control of the recurrent pulse by additionally generating
Parallel A/D converter carries out A/D conversions.
9. a kind of analog voltage divider circuit as described in claim 1, it is characterised in that：At the parallel D/A converter
In direct D/A transition status.
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| CN201810181138.4A CN108509178B (en) | 2016-01-04 | 2016-01-04 | Analog voltage divider circuit |
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| CN201810181138.4A CN108509178B (en) | 2016-01-04 | 2016-01-04 | Analog voltage divider circuit |
| CN201610000413.9A CN105653241B (en) | 2016-01-04 | 2016-01-04 | Seek the device of ratio value between two input voltages |
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| CN105653241A (en) | 2016-06-08 |
| CN105653241B (en) | 2018-06-26 |
| CN108509178B (en) | 2022-01-18 |
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