CN201955395U - Sensor frequency transmitter circuit - Google Patents
Sensor frequency transmitter circuit Download PDFInfo
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- CN201955395U CN201955395U CN2010206802198U CN201020680219U CN201955395U CN 201955395 U CN201955395 U CN 201955395U CN 2010206802198 U CN2010206802198 U CN 2010206802198U CN 201020680219 U CN201020680219 U CN 201020680219U CN 201955395 U CN201955395 U CN 201955395U
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- operational amplifier
- frequency transmitter
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Abstract
The utility model relates to a sensor frequency transmitter circuit, belonging to the technical field of a transmitter and mainly solving the problems of the sensor frequency transmitter circuit that the circuit cost is high and the debugging cannot be carried out easily. The sensor frequency transmitter circuit comprises a Wheatstone bridge, an operational amplifier, a V/F (voltage/frequency) converter LM331, a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4) and a frequency output terminal (f). Since the principle of virtual access of input ends of the operational amplifier with the same phase or with opposite phases is adopted, and the short-circuit output current of the Wheatstone bridge is used as an input signal of a sensor frequency transmitter, a signal amplifier is eliminated directly, sensor bridge signals are directly converted into frequency signals, the circuit is very simple and practical, the cost of the transmitter is greatly reduced, and the production efficiency is increased.
Description
Technical field
The utility model relates to a kind of transmitter circuit, and specifically a kind of sensor frequency transmitter circuit belongs to the transmitter technical field.
Background technology
At present, a lot of sensor frequency transmitter circuits all are Wheatstone bridges, or form signal conversion circuit with Wheatstone bridge.Since the voltage output signal of traditional Wheatstone bridge generally be the millivolt level other, can not directly export as voltage transmitter, must be amplified to the volt level by amplifier, therefore, most of sensors all will amplify through signal, after becoming the normal voltage signal, give frequency/voltage (V/F) change-over circuit again, convert frequency signal output to.Because signal amplifier is accurate mimic channel, the sensor frequency transmitter circuit is the cost height not only, and debugging bothers.
The utility model content
For overcoming the deficiency that above-mentioned prior art exists, technical problem to be solved in the utility model is to provide a kind of sensor frequency transmitter circuit, not only can reduce the transmitter cost, and debugging is simple.The technical scheme in the invention for solving the technical problem is: this a kind of sensor frequency transmitter circuit, it is characterized in that, comprise Wheatstone bridge, operational amplifier, V/F converter LM331, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity and frequency outlet terminal; Wherein, described Wheatstone bridge one input end connects driving voltage, another input end grounding, one output terminal is connected with the inverting input of operational amplifier, an end of second electric capacity and 1 pin of V/F converter LM331 respectively, and another output terminal is connected with the in-phase input end of operational amplifier and an end of first electric capacity respectively; The positive voltage input end of described operational amplifier connects supply voltage, and negative voltage input end grounding, output terminal are connected with the other end of second electric capacity and an end of first resistance respectively; 2 pin of described V/F converter LM331 are connected with an end of the 5th resistance, 3 pin are connected with the frequency outlet terminal with an end of the 6th resistance respectively, 4 pin ground connection, 5 pin are connected with an end of second resistance and an end of the 3rd electric capacity respectively, 6 pin are connected with an end of the 3rd resistance, an end of the 4th resistance and an end of the 4th electric capacity respectively, 7 pin are connected with the other end of first resistance, and 8 pin are connected with reference voltage with the other end of second resistance, the other end of the 3rd resistance; The other end of the other end of the other end of the other end of the other end of first electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th resistance and the 5th resistance is ground connection respectively; The other end of the 6th resistance is connected with reference voltage.
Two output terminals of Wheatstone bridge directly are connected with homophase, the inverting input of operational amplifier, because operational amplifier OP normal phase input end and inverting input equipotential, Wheatstone bridge BR output terminal is equivalent to short circuit, and short-circuit current just becomes the input current of frequency transmitter.
Further, Wheatstone bridge output terminal can the connect resistance or the adjustable resistance of little resistance are in order to adjust the input current of V/F translation circuit.
Further, the 5th resistance is adjustable resistance, can improve the accuracy of frequency output.
The beneficial effects of the utility model are, this kind sensor frequency transmitter circuit has been used the virtual connection principle of operational amplifier positive and inverting input, utilize the short-circuit output current of Wheatstone bridge, input signal as frequency transmitter, directly saved signal amplifier, directly sensor bridge signal transformation has been become frequency signal, circuit is very simple, practical, not only greatly reduce the cost of transmitter, and enhance productivity.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, this kind sensor frequency transmitter circuit, it is characterized in that, comprise Wheatstone bridge BR, operational amplifier OP, V/F converter LM331, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 and frequency outlet terminal end f; Wherein, described Wheatstone bridge BR one input end connects driving voltage, another input end grounding, one output terminal is connected with the inverting input of operational amplifier OP, an end of capacitor C 2 and 1 pin of V/F converter LM331 respectively, and another output terminal is connected with the in-phase input end of operational amplifier OP and an end of capacitor C 1 respectively; The positive voltage input end of described operational amplifier OP connects supply voltage, and negative voltage input end grounding, output terminal are connected with the other end of capacitor C 2 and an end of resistance R 1 respectively; 2 pin of described V/F converter LM331 are connected with an end of resistance R 5,3 pin are connected with frequency outlet terminal f with an end of resistance R 6 respectively, 4 pin ground connection, 5 pin are connected with an end of resistance R 2 and an end of capacitor C 3 respectively, 6 pin are connected with an end of resistance R 3, an end of resistance R 4 and an end of capacitor C 4 respectively, 7 pin are connected with the other end of resistance R 1, and 8 pin are connected with reference voltage with the other end of resistance R 2, the other end of resistance R 3; The other end of the other end of the other end of the other end of the other end of capacitor C 1, capacitor C 3, capacitor C 4, resistance R 4 and resistance R 5 is ground connection respectively; The other end of resistance R 6 is connected with reference voltage.
Two output terminals of Wheatstone bridge BR directly are connected with homophase, the inverting input of operational amplifier OP, because operational amplifier OP positive and inverting input equipotential, Wheatstone bridge BR output terminal is equivalent to short circuit, and short-circuit current just becomes the input current of frequency transmitter.Electric current carries out integration by capacitor C 2, and integral voltage is received 7 pin (internal comparator input end) of V/F converter LM331.Integral voltage is elevated to when equaling 6 pin voltages, LM331 will discharge to integral voltage by fixed current of 1 pin output, depend on resistance R 2 and capacitor C 3 discharge time, the 1 pin output current that discharge is just cut off V/F converter LM331 after finishing so moves in circles.
In addition, Wheatstone bridge BR output terminal can the connect resistance or the adjustable resistance of little resistance are used for adjusting the input current of V/F translation circuit; The 5th resistance can be selected adjustable resistance for use, can improve the accuracy of frequency output.
Claims (4)
1. sensor frequency transmitter circuit, it is characterized in that, comprise Wheatstone bridge (BR), operational amplifier (OP), V/F converter LM331, first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), first electric capacity (C1), second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4) and frequency outlet terminal (f); Wherein, described Wheatstone bridge (BR) input end connects driving voltage, another input end grounding, one output terminal is connected with the inverting input of operational amplifier (OP), an end of second electric capacity (C2) and 1 pin of V/F converter LM331, and another output terminal is connected with the in-phase input end of operational amplifier (OP) and an end of first electric capacity (C1) respectively; The positive voltage input end of described operational amplifier (OP) connects supply voltage, and negative voltage input end grounding, output terminal are connected with the other end of second electric capacity (C2) and an end of first resistance (R1) respectively; 2 pin of described V/F converter LM331 are connected with an end of the 5th resistance (R5), 3 pin are connected with frequency outlet terminal (f) with an end of the 6th resistance (R6) respectively, 4 pin ground connection, 5 pin are connected with an end of second resistance (R2) and an end of the 3rd electric capacity (C3) respectively, 6 pin are connected with an end of the 3rd resistance (R3), an end of the 4th resistance (R4) and an end of the 4th electric capacity (C4) respectively, 7 pin are connected with the other end of first resistance (R1), and 8 pin are connected with reference voltage with the other end of second resistance (R2), the other end of the 3rd resistance (R3); The other end of the other end of the other end of the other end of the other end of first electric capacity (C1), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 4th resistance (R4) and the 5th resistance (R5) is ground connection respectively; The other end of the 6th resistance (R6) is connected with reference voltage.
2. a kind of sensor frequency transmitter circuit according to claim 1 is characterized in that, two output terminals of Wheatstone bridge (BR) directly are connected with homophase, the inverting input of operational amplifier (OP).
3. a kind of sensor frequency transmitter circuit according to claim 2 is characterized in that, Wheatstone bridge (BR) output terminal can the connect resistance or the adjustable resistance of little resistance are in order to adjust the input current of V/F translation circuit.
4. a kind of sensor frequency transmitter circuit according to claim 1 is characterized in that the 5th resistance (R5) is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206802198U CN201955395U (en) | 2010-12-27 | 2010-12-27 | Sensor frequency transmitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206802198U CN201955395U (en) | 2010-12-27 | 2010-12-27 | Sensor frequency transmitter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201955395U true CN201955395U (en) | 2011-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206802198U Expired - Fee Related CN201955395U (en) | 2010-12-27 | 2010-12-27 | Sensor frequency transmitter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201955395U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099452A (en) * | 2015-08-12 | 2015-11-25 | 成都易思科科技有限公司 | Circuit for converting voltage signal into frequency signal |
| CN117811352A (en) * | 2024-03-01 | 2024-04-02 | 南京信息工程大学 | Cathode quick start power supply based on computer control |
-
2010
- 2010-12-27 CN CN2010206802198U patent/CN201955395U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099452A (en) * | 2015-08-12 | 2015-11-25 | 成都易思科科技有限公司 | Circuit for converting voltage signal into frequency signal |
| CN105099452B (en) * | 2015-08-12 | 2018-10-26 | 成都易思科科技有限公司 | A kind of circuit for voltage signal to be converted to frequency signal |
| CN117811352A (en) * | 2024-03-01 | 2024-04-02 | 南京信息工程大学 | Cathode quick start power supply based on computer control |
| CN117811352B (en) * | 2024-03-01 | 2024-05-14 | 南京信息工程大学 | Cathode quick start power supply based on computer control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20141227 |
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| EXPY | Termination of patent right or utility model |