CN208956006U - A kind of high-precision current/freq converting circuit based on triangular modulation - Google Patents
A kind of high-precision current/freq converting circuit based on triangular modulation Download PDFInfo
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- CN208956006U CN208956006U CN201821616263.5U CN201821616263U CN208956006U CN 208956006 U CN208956006 U CN 208956006U CN 201821616263 U CN201821616263 U CN 201821616263U CN 208956006 U CN208956006 U CN 208956006U
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Abstract
The utility model relates to a kind of high-precision current/freq converting circuit based on triangular modulation, including main integrator, the input terminal of the main integrator is input current end, the input terminal of the output end and comparator of main integrator and circuit for generating triangular wave connects, the output end of comparator and the input terminal all the way of digital processing circuit connect, the two-way output end of the digital processing circuit control terminal with ultrahigh speed switching circuit respectively, the input terminal of output circuit connects, the input terminal of ultrahigh speed switching circuit and the output end of constant-current source circuit connect, the output end of ultrahigh speed switching circuit is connect with the input terminal of main integrator, the output end of shaping circuit and the another way input terminal of digital processing circuit connect, the input terminal of shaping circuit and the output end of circuit for generating triangular wave connect.The utility model solves the problems, such as that debugging difficulty is big, personnel requirement is higher, is unable to satisfy batch production demand to debugging during current scheduling and planning.
Description
Technical field
A kind of the utility model analog-digital hybrid circuit technical field, and in particular to high-precision based on triangular modulation
Current/frequency conversion circuit.
Background technique
Current/frequency conversion circuit is one of important component of inertial navigation system, in inertial navigation system with accelerometer
It is used together, the output electric current of accelerometer is converted into the digital pulse signal being proportional.Currently, using charge balance
The current/frequency conversion circuit of principle is used widely, and the threshold level in traditional method compared with main integrator uses
Fixed threshold level, in big input current signal, it is larger to switch number for constant-current source, due to transition in constant-current source handoff procedure
Time is the principal element for influencing conversion accuracy, so its precision is difficult to reach dreamboat, generallys use compensation or digital school
Quasi- method compensates, but its process is complicated, and debugging work load is big, higher to component requirements.It is therefore desirable to traditional electricity
Line structure improves, and reduces error caused by above-mentioned transient process from mechanism, promotes circuit precision, reduces debugging difficulty.
Utility model content
The purpose of this utility model is to provide a kind of high-precision current/freq converting circuit based on triangular modulation,
The global switch working frequency for reducing circuit reduces error caused by transient process from mechanism, promotes circuit precision, reduces and adjusts
Try difficulty.
To achieve the above object, the utility model uses following technical scheme:
A kind of high-precision current/freq converting circuit based on triangular modulation, it is characterised in that: including main integrator,
Comparator, digital processing circuit, shaping circuit, ultrahigh speed switching circuit, constant-current source circuit, output circuit and triangular wave generate electricity
Road, the input terminal of the main integrator are input current end, the output end and comparator of main integrator and circuit for generating triangular wave
Input terminal connection, the input terminal all the way of the output end of comparator and digital processing circuit connects, the two-way of digital processing circuit
Output end is connect with the input terminal of the control terminal of ultrahigh speed switching circuit, output circuit respectively, the input of ultrahigh speed switching circuit
End is connect with the output end of constant-current source circuit, and the output end of ultrahigh speed switching circuit is connect with the input terminal of main integrator, shaping
The output end of circuit and the another way input terminal of digital processing circuit connect, the input terminal and circuit for generating triangular wave of shaping circuit
Output end connection.
Further, the circuit for generating triangular wave includes frequency dividing circuit, threshold integrating amplification circuit and crystal oscillator, and described point
The input terminal of frequency circuit is connected through the input terminal of crystal oscillator and shaping circuit, the output end and threshold integrating amplification circuit of frequency dividing circuit
Import and export connection, the input terminal of the output end of threshold integrating amplification circuit and comparator connects.
Further, the main integrator includes accurate amplifier N1, integrating capacitor Cf1, triode VJ1 and triode VJ2,
The non-inverting input terminal ground connection of the precision amplifier N1, inverting input terminal is through resistance RJ1 as input current end, accurate amplifier N1
Output end successively through the input terminal of resistance RJ2, RJ3 and comparator connect, the base stage of the triode VJ1 and triode VJ2
It being connected at the node between resistance RJ2 and resistance RJ3, the collector of triode VJ1 and triode VJ2 connect to power supply, and three
One end of input terminal of the emitter of pole pipe VJ1 and triode VJ2 respectively through resistance RJ4, RJ5 and comparator, integrating capacitor Cf1
Connection, the other end of integrating capacitor Cf1 are connect with the inverting input terminal of accurate amplifier N1.
Further, the threshold integrating amplification circuit includes integrator N2 and proportion operational amplifier N3, the integral
The non-inverting input terminal of device N2 is grounded, and inverting input terminal is connected through the output end of resistance RT1 and frequency dividing circuit, and integrator N2's is defeated
Outlet is connect through resistance RT2 with the inverting input terminal of proportion operational amplifier N3, the non-inverting input terminal of proportion operational amplifier N3
Ground connection, the output end of proportion operational amplifier N3 are connect with comparator.
Further, the ultrahigh speed switching circuit is by triode V1, V2, field effect transistor V3 and peripheral circuit group
At the base stage of the triode V1 is connect after resistance R1, capacitor C1 are in parallel with the output end of digital processing circuit, triode V1
Collector connect to power supply, the emitter of triode V1 is connect through resistance R2 with the grid of field effect transistor V3；Described three
Pole pipe V2 collector is connect with the grid of field effect transistor V3, and emitter connects to power supply, and base stage is connected through capacitor C3
At node between capacitor C1 and resistance R1, the source electrode and grid of field effect transistor V3 are the output of ultrahigh speed switching circuit
End.
As shown from the above technical solution, high-precision current/frequency described in the utility model based on triangular modulation turns
Circuit is changed, the global switch working frequency of circuit is reduced, is switched using the ultrahigh speed of discrete device composition, was reduced from mechanism
Error caused by transient promotes circuit precision.By electric current/frequency-conversion circuit provided by the utility model without compensating just
Can reach degree of precision, solve debugging difficulty during current scheduling and planning it is big, it is higher to debugging personnel requirement, be unable to satisfy
The problem of batch production demand.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the utility model；
Fig. 2 is the circuit diagram of the main integrator of the utility model；
Fig. 3 is the circuit diagram of the threshold integrating amplification circuit of the utility model；
Fig. 4 is the circuit diagram of the hypervelocity switching circuit of the utility model；
Fig. 5 is the utility model circuit working signal waveform diagram.
Specific embodiment
The utility model is described further with reference to the accompanying drawing:
As shown in Figure 1, high-precision current/the freq converting circuit based on triangular modulation of the present embodiment, including main product
Divide device 1, comparator 5, digital processing circuit 7, shaping circuit 6, ultrahigh speed switching circuit 8, constant-current source circuit 9, output circuit 10
And circuit for generating triangular wave, the input terminal of main integrator 1 are input current end, main integrator 1 and circuit for generating triangular wave it is defeated
Outlet is connect with the input terminal of comparator 5, and the output end of comparator 5 is connect with the input terminal all the way of digital processing circuit 7, number
The two-way output end of processing circuit 7 is connect with the input terminal of the control terminal of ultrahigh speed switching circuit 8, output circuit 10 respectively, is surpassed
The input terminal of high-speed switching circuit 8 is connect with the output end of constant-current source circuit 9, the output end of ultrahigh speed switching circuit 8 and main product
Divide the input terminal connection of device 1, the output end of shaping circuit 6 is connect with the another way input terminal of digital processing circuit 7, shaping circuit
6 input terminal and the output end of circuit for generating triangular wave connect.
The output of main integrator 1 connects an input of comparator 5, is compared with the another way threshold level of comparator 5,
Another way threshold level is low frequency triangular wave, which is generated by threshold integrating amplification circuit 4, threshold integral amplification electricity
The input on road 4 is 16KHz low-frequency square-wave signal, is obtained by crystal oscillator by frequency dividing circuit 3.Digital processing circuit 7 it is defeated all the way
The input terminal that constant-current source circuit 9 is accessed to by controlling ultrahigh speed switching circuit 8 main integrator 1 out, according to digital processing circuit 7
Output situation control the on-off of super ultrahigh speed switching circuit 8, it is whole that the 128KHz frequency standard signal that crystal oscillator 2 generates passes through shaping circuit
Digital processing circuit 7 is input to after shape, control output circuit 10 generates pulse output.
Circuit for generating triangular wave includes frequency dividing circuit 3, threshold integrating amplification circuit 4 and crystal oscillator 2, the input of frequency dividing circuit 3
End is connect through crystal oscillator 2 with the input terminal of shaping circuit 6, the output end of frequency dividing circuit 3 and the import and export of threshold integrating amplification circuit 4
Connection, the output end of threshold integrating amplification circuit 4 are connect with the input terminal of comparator 5.
As shown in Fig. 2, main integrator 1 includes accurate amplifier N1, integrating capacitor Cf1, triode VJ1 and triode VJ2, essence
The non-inverting input terminal of close amplifier N1 is grounded, and the inverting input terminal of accurate amplifier is through resistance RJ1 as input current end, accurate amplifier
The output end of N1 is successively connected through the input terminal of resistance RJ2, RJ3 and comparator 5, and the base stage of triode VJ1 and triode VJ2 connect
It connects at the node between resistance RJ2 and resistance RJ3, the collector of triode VJ1 and triode VJ2 connect to power supply, three poles
One end of input terminal of the emitter of pipe VJ1 and triode VJ2 respectively through resistance RJ4, RJ5 and comparator 5, integrating capacitor Cf1
Connection, the other end of integrating capacitor Cf1 are connect with the inverting input terminal of accurate amplifier N1.
As shown in figure 3, threshold integrating amplification circuit 4 is by the prime integrator N2 integrating circuit constituted and rear class scale operation
The scale operation amplifying circuit that amplifier N3 is constituted is constituted, the non-inverting input terminal ground connection of integrator N2, and the reverse phase of integrator N2 is defeated
Enter end to connect through 3 output ends of resistance RT1 and frequency dividing circuit, the output end of integrator N2 amplifies through resistance RT2 and scale operation
The inverting input terminal of device N3 connects, the non-inverting input terminal ground connection of proportion operational amplifier N3, the output of proportion operational amplifier N3
End is connect with comparator.
The integrating circuit that prime integrator N2 is constituted is the low-frequency square-wave that crystal oscillation fractional frequency obtains, frequency 16KHz, N2 structure
At integrating circuit in integrating capacitor CT1 capacitance be 0.033uf, the value that section RT2 and RT3 can be adjusted flexibly as needed is finely tuned
The horizontal current potential of whole output threshold triangular wave makes circuit reach desired work so that the circuit actual measurement linearity is micro-adjusted
Make precision.
As shown in figure 4, ultrahigh speed switching circuit 8 is made of triode V1, V2, field effect transistor V3 and peripheral circuit,
The base stage of triode V1 is connect after resistance R1, capacitor C1 are in parallel with the output end of digital processing circuit 7, the current collection of triode V1
Pole connects to power supply, and the emitter of triode V1 is connect through resistance R2 with the grid of field effect transistor V3；The collection of triode V2
Electrode is connect with the grid of field effect transistor V3, and the emitter of triode V2 connects to power supply, and the base stage of triode V2 is through electricity
Hold C3 to be connected at the node between capacitor C1 and resistance R1, the source electrode and grid of field effect transistor V3 is ultrahigh speed switch electricity
The output end on road 8.
When input is high level, triode V1 cut-off, when the G step voltage of JFET pipe V3 is -15v, switch is disconnected.When defeated
When entering for low level.Triode V1 conducting, by the resistance value of reasonable distribution R2 and R3, can make the G step voltage of JFET pipe V3
In -2v or so, switch conduction.The charge and discharge path of opening process is made of triode V1 and capacitor C2, and turn off process fills
Discharge path is made of triode V2.The turn-on time of usual triode is smaller than turn-off time, can use this feature, when
When input is high level, the first conducting of triode V2, then triode V1 is turned off, this will make the G step voltage-of JFET pipe V3
15v because, even if when triode V1 is not complete switched off also, the conducting of triode V2 can make the G grade of JFET be charged to immediately-
15v.Triode V2 base capacity C3, which can generate excitation triode is made to be held on V1, to be complete switched off.It is equally low when inputting
When level triode V1 base capacity C1 can generate excitation make triode V1 be connected, capacitor immediately C2 to JFET charging lead JFET
It is logical.By optimizing each component parameters, the switching rate of ultrahigh speed switching circuit can be made to be less than 5ns
Working principle: input current is connected to the input terminal of main integrator 5, and constant-current source circuit 9 switchs electricity by ultrahigh speed
Road 8 is also connected to the input terminal of main 1 circuit of integrator, this two-way electric current in this way can be such that main 1 circuit of integrator is constantly accumulated
Divide and reset, generates periodic sawtooth wave integral voltage, this integral voltage is said after being connected to comparator 5 compared with threshold level
Integral voltage digitlization forms height impulse waveform, and comparator 5 exports the input for being connected to digital processing circuit 7, then at number
Reason circuit 7 makes the impulse wave after digitlization carry out shaping by the frequency that shaping circuit exports, and keeps the pulsewidth of impulse wave and frequency same
The integral multiple of the frequency of the output of shaping circuit 6 is walked, the pulse control ultrahigh speed switching circuit 8 that digital processing circuit 7 exports
On-off controls integral and the resetting time of main integrator 1, according to charge to realize the disconnection and access of constant-current source circuit
Equilibrium principle, the integral and the ratio of resetting time of the sawtooth wave are proportional to input current, and 7 outputting standard of digital processing circuit
The pulse duty factor of change is proportional to the integral of sawtooth wave and the ratio of resetting time, then the output direct ratio of digital processing circuit 7
In input circuit, output circuit carries out the generation of integer multiple frequency pulse number by the pulse duty factor of digital processing circuit output,
Then the pulse number of output circuit output is proportional to input current, to realize that high-precision analog current arrives digit pulse
Conversion.
It is illustrated in figure 5 the work wave of circuit, when input current Iin is smaller, main 1 waveform of integrator work is in threshold
Integral and reseting procedure are completed in the upper end of triangular wave in a cycle of triangular wave, and reset pulse is smaller at this time, corresponding defeated
Pulse is less out.When input current Iin is larger, main 1 waveform of integrator work is in the lower end of threshold triangular wave, equally in triangle
Integral and reseting procedure are completed in a cycle of wave, reset pulse is larger at this time, and corresponding output pulse is more.It can see
Arrive, with the introducing of low frequency triangular waveform, when high current and low current input circuit integral reset always work in one it is lower
Switching frequency on, which is the frequency of the threshold triangle wave level of 16KHz, thus will be greatly reduced whole due to opening
Closing the error that transient process generates reduces the high frequency error of integrator.And output circuit passes through the 128KHz that generates crystal oscillator 2 frequency
Mark signal and reset pulse phase with can very in terms of obtain direct proportion in the output pulse number of the width of reset pulse, thus
The high-precision for realizing electric current to frequency is converted.
Embodiment described above is only that preferred embodiments of the present invention are described, not practical to this
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to this
The various changes and improvements that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In range.
Claims (5)
1. a kind of high-precision current/freq converting circuit based on triangular modulation, it is characterised in that: including main integrator, ratio
Electricity is generated compared with device, digital processing circuit, shaping circuit, ultrahigh speed switching circuit, constant-current source circuit, output circuit and triangular wave
Road, the input terminal of the main integrator are input current end, the output end and comparator of main integrator and circuit for generating triangular wave
Input terminal connection, the input terminal all the way of the output end of comparator and digital processing circuit connects, the two-way of digital processing circuit
Output end is connect with the input terminal of the control terminal of ultrahigh speed switching circuit, output circuit respectively, the input of ultrahigh speed switching circuit
End is connect with the output end of constant-current source circuit, and the output end of ultrahigh speed switching circuit is connect with the input terminal of main integrator, shaping
The output end of circuit and the another way input terminal of digital processing circuit connect, the input terminal and circuit for generating triangular wave of shaping circuit
Output end connection.
2. high-precision current/freq converting circuit according to claim 1 based on triangular modulation, it is characterised in that:
The circuit for generating triangular wave includes frequency dividing circuit, threshold integrating amplification circuit and crystal oscillator, the input terminal warp of the frequency dividing circuit
The connection of the input terminal of crystal oscillator and shaping circuit, the output end of frequency dividing circuit are connect with the import and export of threshold integrating amplification circuit, door
The output end of sill integrating amplification circuit and the input terminal of comparator connect.
3. high-precision current/freq converting circuit according to claim 1 based on triangular modulation, it is characterised in that:
The main integrator includes accurate amplifier N1, integrating capacitor Cf1, triode VJ1 and triode VJ2, the precision amplifier N1's
Non-inverting input terminal ground connection, inverting input terminal is through resistance RJ1 as input current end, and the output end of accurate amplifier N1 is successively through electricity
The input terminal for hindering RJ2, RJ3 and comparator connects, and the base stage of the triode VJ1 and triode VJ2 are connected to resistance RJ2 and electricity
It hinders at the node between RJ3, the collector of triode VJ1 and triode VJ2 connect to power supply, triode VJ1 and triode VJ2
Input terminal of the emitter respectively through resistance RJ4, RJ5 and comparator, integrating capacitor Cf1 one end connection, integrating capacitor Cf1's
The other end is connect with the inverting input terminal of accurate amplifier N1.
4. high-precision current/freq converting circuit according to claim 2 based on triangular modulation, it is characterised in that:
The threshold integrating amplification circuit includes the homophase input termination of integrator N2 and proportion operational amplifier N3, the integrator N2
Ground, inverting input terminal are connected through the output end of resistance RT1 and frequency dividing circuit, the output end of integrator N2 through resistance RT2 with than
The inverting input terminal connection of example operational amplifier N3, the non-inverting input terminal ground connection of proportion operational amplifier N3, scale operation amplification
The output end of device N3 is connect with comparator.
5. high-precision current/freq converting circuit according to claim 1 based on triangular modulation, it is characterised in that:
The ultrahigh speed switching circuit is made of triode V1, V2, field effect transistor V3 and peripheral circuit, the base of the triode V1
Pole is connect after resistance R1, capacitor C1 are in parallel with the output end of digital processing circuit, and the collector of triode V1 connects to power supply,
The emitter of triode V1 is connect through resistance R2 with the grid of field effect transistor V3；The triode V2 collector and field-effect
The grid of transistor V3 connects, and emitter connects to power supply, and base stage is connected between capacitor C1 and resistance R1 through capacitor C3
Node at, the source electrode and grid of field effect transistor V3 are the output end of ultrahigh speed switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616263.5U CN208956006U (en) | 2018-09-30 | 2018-09-30 | A kind of high-precision current/freq converting circuit based on triangular modulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616263.5U CN208956006U (en) | 2018-09-30 | 2018-09-30 | A kind of high-precision current/freq converting circuit based on triangular modulation |
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| CN208956006U true CN208956006U (en) | 2019-06-07 |
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| CN201821616263.5U Active CN208956006U (en) | 2018-09-30 | 2018-09-30 | A kind of high-precision current/freq converting circuit based on triangular modulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004919A (en) * | 2018-09-30 | 2018-12-14 | 中国电子科技集团公司第四十三研究所 | A kind of high-precision current/freq converting circuit and conversion method based on triangular modulation |
-
2018
- 2018-09-30 CN CN201821616263.5U patent/CN208956006U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004919A (en) * | 2018-09-30 | 2018-12-14 | 中国电子科技集团公司第四十三研究所 | A kind of high-precision current/freq converting circuit and conversion method based on triangular modulation |
| CN109004919B (en) * | 2018-09-30 | 2024-03-22 | 中国电子科技集团公司第四十三研究所 | Current/frequency conversion circuit and conversion method based on triangular wave modulation |
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