CN204498109U - A kind of voltage-frequency conversion circuit - Google Patents
A kind of voltage-frequency conversion circuit Download PDFInfo
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- CN204498109U CN204498109U CN201520256337.9U CN201520256337U CN204498109U CN 204498109 U CN204498109 U CN 204498109U CN 201520256337 U CN201520256337 U CN 201520256337U CN 204498109 U CN204498109 U CN 204498109U
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- conversion circuit
- frequency conversion
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Abstract
A kind of voltage-frequency conversion circuit, it comprises: follower module, and the input of described follower module is electrically connected on power supply; Image current source module, the input of described image current source module is coupled to the output of follower module; Voltage-frequency modular converter, the input of described voltage-frequency modular converter is coupled to the output of image current source module.Voltage-frequency conversion circuit of the present utility model, adopts simple electronic devices and components, and composition voltage-frequency conversion circuit, has not only saved circuit cost, and the simultaneously compatible linearity of voltage-frequency conversion, cost is low, and the linearity is good.
Description
Technical field
The utility model relates to voltage to frequency convert technical field, particularly relates to a kind of voltage-frequency conversion circuit.
Background technology
Voltage to frequency convert is in fact that a kind of frequency of oscillation changes with the change of applied voltage, and control output frequency by input voltage, the output signal frequency of voltage/frequency translation circuit is directly proportional to input voltage.So be widely used in frequency modulation and the many fields of mould/transformation of variables.Common product uses voltage-frequency conversion chip, and such as AD7740, AD0809, AD574A, although can reach very high conversion accuracy, cost is relatively high, or uses 555 common timer change-over circuits, and cost is not high, but the linearity is poor.
Utility model content
The purpose of this utility model is to provide a kind of voltage-frequency conversion circuit, which solves current voltage frequency conversioning circuit cost high, the technical problem of poor linearity.
For achieving the above object, the technical scheme that the utility model proposes is:
A kind of voltage-frequency conversion circuit of the present utility model, it comprises:
Follower module, the input of described follower module is electrically connected on power supply;
Image current source module, the input of described image current source module is coupled to the output of follower module;
Voltage-frequency modular converter, the input of described voltage-frequency modular converter is coupled to the output of image current source module.
Wherein, the voltage of power supply passes through described follower module successively, output frequency signal after image current source module and voltage-frequency modular converter.
Wherein, described follower module comprises operational amplifier U1, and the input in the same way of described operational amplifier U1 is connected to power supply, and reverse input end is connected to output.
Wherein, image current source module comprises, resistance R4, resistance R5, electric capacity C2, triode Q1 and Q2, wherein, resistance R4 is electrically connected on the collector electrode of triode Q1, and the emitter of triode Q1 and base stage are electrically connected on emitter and the base stage of triode Q2 respectively, the collector electrode of triode Q1 is directly electrically connected on base stage, ground connection after being series at electric capacity C2 after the collector electrode of triode Q2 is electrically connected on resistance R5.
Wherein, described voltage-frequency modular converter comprises 555 timer U2.
Voltage-frequency conversion circuit of the present utility model, adopts simple electronic devices and components, and composition voltage-frequency conversion circuit, has not only saved circuit cost, and the simultaneously compatible linearity of voltage-frequency conversion, cost is low, and the linearity is good.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model voltage-frequency conversion circuit.
Fig. 2 is input voltage and the output frequency coordinate diagram of the utility model voltage-frequency conversion circuit.
Embodiment
Below with reference to accompanying drawing, elaboration is further given to the utility model.
Refer to Fig. 1, a kind of voltage-frequency conversion circuit, it comprises: follower module 100, image current source module 200 and voltage-frequency modular converter 300.Wherein, the input of follower module 100 is electrically connected on power supply; The input of image current source module is coupled to the output of follower module 100; The input of voltage-frequency modular converter 300 is coupled to the output of image current source module 200.
Follower module 100 comprises operational amplifier U1, electric capacity C1.The input in the same way of described operational amplifier U1 is connected after a resistance R1 and is connected to power supply, and reverse input end is directly connected in the output of operational amplifier U1 by wire.Directly connect between the positive source of operational amplifier and negative pole an electric capacity C1.Further, positive source is connected to 5V power supply.The object done like this does not allow high-frequency signal affect input signal conversely, and emitter follower serves the effect of an isolation.
Image current source module 200 comprises, resistance R4, resistance R5, electric capacity C2, triode Q1 and Q2.Wherein, one end of resistance R4 is connected to the output of operational amplifier U1, and one end is electrically connected on the collector electrode of triode Q1 in addition.The emitter of triode Q1 and base stage are electrically connected on emitter and the base stage of triode Q2 respectively, and the node between the collector electrode of triode Q1 and resistance is directly electrically connected on the base stage of triode Q1 by wire.The emitter of triode Q1, Q2 is connected to 5V power supply jointly.The collector electrode of triode Q2 be series at resistance R5 and electric capacity C2 after ground connection.Image current source module 200 is for stabilized power supply electric current.
Wherein, described voltage-frequency modular converter comprises 555 timer U2, electric capacity C4.Wherein, the DSCHG of 555 timer U2 is connected to the collector electrode of triode Q2, and THR pin and TRG pin are connected to the node between resistance R5 and electric capacity C2 simultaneously, and RST pin is directly connected in 5V power supply, the direct ground connection of CV pin.Further, connect between VCC pin and GND an electric capacity C4.
Refer to following table, adopt the experimental data of this voltage-frequency conversion circuit, table one is input voltage and output frequency table.
| Input voltage (Vdc) | Output frequency (KHz) |
| 0 | 4.89 |
| 0.5 | 4.54 |
| 1 | 4.19 |
| 1.5 | 3.83 |
| 2 | 3.48 |
| 2.5 | 3.12 |
| 3 | 2.75 |
| 3.5 | 2.39 |
| 4 | 2.01 |
| 4.5 | 1.63 |
| 5 | 1.25 |
Table one
Refer to accompanying drawing 2 visible, the output frequency linearity of this voltage-frequency conversion circuit is very high.
Foregoing; be only preferred embodiment of the present utility model; not for limiting embodiment of the present utility model; those of ordinary skill in the art are according to central scope of the present utility model and spirit; can carry out corresponding flexible or amendment very easily, therefore protection range of the present utility model should be as the criterion with the protection range required by claims.
Claims (4)
1. a voltage-frequency conversion circuit, is characterized in that, comprising:
Follower module, the input of described follower module is electrically connected on power supply;
Image current source module, the input of described image current source module is coupled to the output of follower module;
Voltage-frequency modular converter, the input of described voltage-frequency modular converter is coupled to the output of image current source module
Wherein, the voltage of power supply passes through described follower module successively, output frequency signal after image current source module and voltage-frequency modular converter.
2. voltage-frequency conversion circuit as claimed in claim 1, it is characterized in that, described follower module comprises operational amplifier U1, and the input in the same way of described operational amplifier U1 is connected to power supply, and reverse input end is connected to output.
3. voltage-frequency conversion circuit as claimed in claim 1, it is characterized in that, described image current source module comprises, resistance R4, resistance R5, electric capacity C2, triode Q1 and Q2, wherein, resistance R4 is electrically connected on the collector electrode of triode Q1, the emitter of triode Q1 and base stage are electrically connected on emitter and the base stage of triode Q2 respectively, and the collector electrode of triode Q1 is directly electrically connected on base stage, ground connection after being series at electric capacity C2 after the collector electrode of triode Q2 is electrically connected on resistance R5.
4. voltage-frequency conversion circuit as claimed in claim 1, it is characterized in that, described voltage-frequency modular converter comprises 555 timer U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520256337.9U CN204498109U (en) | 2015-04-24 | 2015-04-24 | A kind of voltage-frequency conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520256337.9U CN204498109U (en) | 2015-04-24 | 2015-04-24 | A kind of voltage-frequency conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204498109U true CN204498109U (en) | 2015-07-22 |
Family
ID=53577384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520256337.9U Active CN204498109U (en) | 2015-04-24 | 2015-04-24 | A kind of voltage-frequency conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204498109U (en) |
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2015
- 2015-04-24 CN CN201520256337.9U patent/CN204498109U/en active Active
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