CN203968084U - A kind of signal conditioning circuit - Google Patents
A kind of signal conditioning circuit Download PDFInfo
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- CN203968084U CN203968084U CN201420342120.5U CN201420342120U CN203968084U CN 203968084 U CN203968084 U CN 203968084U CN 201420342120 U CN201420342120 U CN 201420342120U CN 203968084 U CN203968084 U CN 203968084U
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- operational amplifier
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Abstract
The utility model relates to a kind of circuit structure, especially a kind of signal conditioning circuit that is applicable to TL494 type pulse width modulator.It comprises single order operational amplifier and second order operational amplifier; Between 1 pin of single order operational amplifier and 8 pin, be in series with successively single order adjustable resistance and single order resistive element, between 1 pin of second order operational amplifier and 8 pin, be in series with successively second order adjustable resistance and second order resistive element; 6 pin of single order operational amplifier connect 2 pin of second order operational amplifier by the 5th resistance, 6 pin of second order operational amplifier connect A/D converter by the 6th resistance.The utility model has formed low pass filter taking single order operational amplifier as core, formed voltage-tracing device taking second order operational amplifier as core, it can effectively reduce noise jamming, and in the time connecting TL494 type pulse width modulator, be conducive to improve its load-carrying ability, reduce output impedance; It is simple in structure, has very strong practicality.
Description
Technical field
The utility model relates to a kind of circuit structure, especially a kind of signal conditioning circuit that is applicable to TL494 type pulse width modulator.
Background technology
Known, analog sensor can be measured a lot of physical quantitys, as temperature, pressure, light intensity etc., but because sensor signal can not directly be converted to numerical data, this be because transducer output be quite little voltage, electric current or resistance variations.Therefore, before being transformed to digital signal, must nurse one's health, namely amplify, buffering or to fix the scale by simulation signal etc., make it be suitable for the input of A/D converter (ADC); Then, ADC carries out digitlization to analog signal, and digital signal is delivered to MCU or other digital devices, for use in the data processing of system.
And the fixed frequency pulse-width modulation circuit being made up of TL494 type pulse width modulator has comprised the required repertoire of Switching Power Supply control, it is widely used in single-end ortho-exciting double hose, semibridge system, full-bridge type Switching Power Supply; The voltage signal that the analog signal that the ADC module of TL494 type pulse width modulator can be accepted is 0-3V, therefore, need to nurse one's health the signal of input ADC module, to convert the voltage signal within the scope of 0-3V to, existing signal conditioning circuit structure relative complex, the noise jamming that is applicable to TL494 type pulse width modulator is large, is unfavorable for improving the load-carrying ability of modulator.
Utility model content
The deficiency existing for above-mentioned prior art, the purpose of this utility model is to provide that a kind of circuit structure is simple, noise jamming is little, can be conducive to improve the signal conditioning circuit of TL494 type pulse width modulator carrying load ability.
To achieve these goals, the utility model adopts following technical scheme:
A kind of signal conditioning circuit, it comprises single order operational amplifier and second order operational amplifier;
Between 1 pin of described single order operational amplifier and 8 pin, be in series with successively single order adjustable resistance and single order resistive element, all be connected+15V of the 7 pin voltage of the adjustable side of described single order adjustable resistance and single order operational amplifier, between 2 pin of described single order operational amplifier and 6 pin, be in series with the first resistance, 3 pin of described single order operational amplifier pass through the 7th resistance external connected electronic element by the second grounding through resistance, 4 pin connection-15V voltages, 2 pin;
Between 1 pin of described second order operational amplifier and 8 pin, be in series with successively second order adjustable resistance and second order resistive element, all be connected+15V of the 7 pin voltage of the adjustable side of described second order adjustable resistance and second order operational amplifier, between 2 pin of described second order operational amplifier and 6 pin, be in series with the 3rd resistance, 3 pin of described second order operational amplifier are by the 4th resistance external connected electronic components and parts, 4 pin connection-15V voltages;
6 pin of described single order operational amplifier connect 2 pin of second order operational amplifier by the 5th resistance, 6 pin of described second order operational amplifier connect A/D converter by the 6th resistance.
Owing to having adopted such scheme, the utility model has formed low pass filter taking single order operational amplifier as core, formed voltage-tracing device taking second order operational amplifier as core, it can effectively reduce noise jamming, and in the time connecting TL494 type pulse width modulator, be conducive to improve its load-carrying ability, reduce output impedance; It is simple in structure, has very strong practicality.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, the signal conditioning circuit of the present embodiment, it comprises single order operational amplifier Q1 and second order operational amplifier Q2; Between 1 pin of single order operational amplifier Q1 and 8 pin, be in series with successively single order adjustable resistance RW3 and single order resistive element AR1, all be connected+15V of the 7 pin voltage of the adjustable side of single order adjustable resistance RW3 and single order operational amplifier Q1, between 2 pin of single order operational amplifier Q1 and 6 pin, be in series with the first resistance R 18,3 pin of single order operational amplifier Q1 pass through the 7th resistance R 22 external connected electronic elements (continued access is multiple as the electronic devices and components of the syndeton of single order operational amplifier Q1 and second order operational amplifier Q2) by the second resistance R 28 ground connection, 4 pin connection-15V voltages, 2 pin; And between 1 pin of second order operational amplifier Q2 and 8 pin, be in series with successively second order adjustable resistance RW1 and second order resistive element AR3, all be connected+15V of the 7 pin voltage of the adjustable side of second order adjustable resistance RW1 and second order operational amplifier Q2, between 2 pin of second order operational amplifier Q2 and 6 pin, be in series with the 3rd resistance R 19,3 pin of second order operational amplifier Q2 are by the 4th resistance R 30 external connected electronic components and parts (as the output of transducer), 4 pin connection-15V voltages; Meanwhile, 6 pin of single order operational amplifier Q1 connect 2 pin of second order operational amplifier Q2 by the 5th resistance R 24, and 6 pin of second order operational amplifier Q2 connect A/D converter (ADC) by the 6th resistance R 25.
So, can utilize single order resistive element AR1, the first resistance R 18, the 7th resistance R 22 and the second resistance R 28 to carry out the effect of filter out noise interference, make single order operational amplifier Q1 play the effect of low pass filter; And utilize second order resistive element AR3, the 3rd resistance R 19, the 5th resistance R 24, the 4th resistance R 30 and second order operational amplifier Q2 to form voltage follower, in the time that the modulate circuit of the present embodiment is connected in TL494 type pulse width modulator, be conducive to improve its load-carrying ability, reduce output impedance.
The modulate circuit of the present embodiment is simple in structure, can realize the several functions such as filtering, amplitude transformation, signal conversion, has very strong practicality.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (1)
1. a signal conditioning circuit, is characterized in that: it comprises single order operational amplifier and second order operational amplifier;
Between 1 pin of described single order operational amplifier and 8 pin, be in series with successively single order adjustable resistance and single order resistive element, all be connected+15V of the 7 pin voltage of the adjustable side of described single order adjustable resistance and single order operational amplifier, between 2 pin of described single order operational amplifier and 6 pin, be in series with the first resistance, 3 pin of described single order operational amplifier pass through the 7th resistance external connected electronic element by the second grounding through resistance, 4 pin connection-15V voltages, 2 pin;
Between 1 pin of described second order operational amplifier and 8 pin, be in series with successively second order adjustable resistance and second order resistive element, all be connected+15V of the 7 pin voltage of the adjustable side of described second order adjustable resistance and second order operational amplifier, between 2 pin of described second order operational amplifier and 6 pin, be in series with the 3rd resistance, 3 pin of described second order operational amplifier are by the 4th resistance external connected electronic components and parts, 4 pin connection-15V voltages;
6 pin of described single order operational amplifier connect 2 pin of second order operational amplifier by the 5th resistance, 6 pin of described second order operational amplifier connect A/D converter by the 6th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342120.5U CN203968084U (en) | 2014-06-24 | 2014-06-24 | A kind of signal conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420342120.5U CN203968084U (en) | 2014-06-24 | 2014-06-24 | A kind of signal conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203968084U true CN203968084U (en) | 2014-11-26 |
Family
ID=51928624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420342120.5U Expired - Fee Related CN203968084U (en) | 2014-06-24 | 2014-06-24 | A kind of signal conditioning circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203968084U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197720A (en) * | 2016-07-26 | 2016-12-07 | 北京六合伟业科技股份有限公司 | Orientation sensor circuit without temperature calibration |
-
2014
- 2014-06-24 CN CN201420342120.5U patent/CN203968084U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197720A (en) * | 2016-07-26 | 2016-12-07 | 北京六合伟业科技股份有限公司 | Orientation sensor circuit without temperature calibration |
| CN106197720B (en) * | 2016-07-26 | 2019-05-24 | 北京六合伟业科技股份有限公司 | Orientation sensor circuit without temperature calibration |
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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: 20141126 Termination date: 20150624 |
|
| EXPY | Termination of patent right or utility model |