CN202798589U - Signal amplifier - Google Patents
Signal amplifier Download PDFInfo
- Publication number
- CN202798589U CN202798589U CN 201220397434 CN201220397434U CN202798589U CN 202798589 U CN202798589 U CN 202798589U CN 201220397434 CN201220397434 CN 201220397434 CN 201220397434 U CN201220397434 U CN 201220397434U CN 202798589 U CN202798589 U CN 202798589U
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- Prior art keywords
- amplifying circuit
- circuit
- signal
- signal amplifier
- filtering
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Abstract
The utility model provides a signal amplifier, and relates to circuit improvement for a common bridge signal amplifier in industrial automation. The utility model provides the signal amplifier which is strong in drive loading capacity and anti-jamming capacity, wide in application range, low in cost and convenient to maintain. The signal amplifier comprises a bridge amplifying circuit composed of a sensor and an operational amplifier. A toggle switch used for controlling amplification power and zero adjustment ranges is arranged in the bridge amplifying circuit. Signals at an input end of the sensor in the bridge amplifying circuit enter a chopping amplifying circuit after liquid chromatograph (LC) filtering, the signals are amplified in the chopping amplifying circuit, and the amplified signals after being isolated from an output end of the sensor by an optoelectronic isolation circuit are output in a signal mode after first-stage remote control (RC) filtering.
Description
Technical field
The circuit that the utility model relates to electric bridge signal amplifier commonly used in a kind of industrial automation improves.
Background technology
Existing electric bridge signal amplifier exists a little less than the driving load capacity, a little less than the anti-frequency converter interference performance more.And existing electric bridge signal amplifier all is fixing enlargement ratio, makes its range of application be subject to certain limitation.
Summary of the invention
The utility model is exactly for the deficiencies in the prior art, provides that a kind of driving load capacity is strong, antijamming capability strong, range of application has enlarged, and the low maintenance of cost a kind of signal amplifier easily.
For achieving the above object, the utility model adopts following technical scheme, the utility model comprises the electric bridge amplifying circuit, the electric bridge amplifying circuit is made of transducer and operational amplifier, toggle switch is set in order to control enlargement ratio and zeroing scope in the electric bridge amplifying circuit, enter a differential amplifier circuit after the input end signal of the transducer process LC filtering in the electric bridge amplifying circuit, signal is exaggerated in differential amplifier circuit, amplifying signal through the isolation of a photoelectric isolating circuit and output after, through signal output after the one-level RC filtering.
Preferably, the insulating power supply that driving force is strong adopts independent-excited to recommend Switching Power Supply, and its frequency can reach the volume that 100KHz has reduced power unit greatly, has improved the capacity of power supply; What wherein be used for driving sensor has adopted the mode of accurate benchmark and pliotron combination with the live source, the rotating band loading capability that it had not only solved the stability of power supply but also improved power supply.
Preferably, differential amplifier circuit adopts the chopper amplifier of zero shift to form.
The utility model beneficial effect:
(1) antijamming capability is strong: because the input signal of transducer is at first through after amplifying signal in the differential amplifier circuit that the chopper amplifier that adopts zero shift forms after the LC filtering, thereby avoided the interference signal of input to be delivered to output by circuit input and output isolation through photoelectric isolating circuit again, through exporting through signal after the one-level RC filtering again behind the optically coupled isolation circuit; Such combination has very strong antijamming capability.
(2) range of application enlarges: existing electric bridge signal amplifier all is fixing enlargement ratio, make its range of application be subject to certain limitation, and the utility model adopts toggle switch to control the scope of enlargement ratio and zeroing, so enlarged range of application of the present utility model.
(3) cost lower and keep in repair convenient: power volume of the present utility model is little, and it is strong to drive load capacity, thereby can reduce the purchase quantity of power supply, greatly reduces device density, thus cost lower and keep in repair convenient.
Description of drawings
Fig. 1 is electric bridge amplifying circuit principle framework figure of the present utility model;
Fig. 2 is the circuit theory diagrams of chopper amplification circuit;
Fig. 3 is the circuit theory diagrams of photoelectric isolating circuit;
Embodiment
Below in conjunction with accompanying drawing the utility model is further described, following each description only is used for illustrating embodiment of the present utility model, to the not restriction of the utility model protection range.
The utility model comprises the electric bridge amplifying circuit, the electric bridge amplifying circuit is made of transducer and operational amplifier, toggle switch is set in order to control enlargement ratio and zeroing scope in the electric bridge amplifying circuit, enter a differential amplifier circuit after the input end signal of the transducer process LC filtering in the electric bridge amplifying circuit, signal is exaggerated in differential amplifier circuit, amplifying signal through the isolation of a photoelectric isolating circuit and output after, through signal output after the one-level RC filtering.
Above-mentioned chopper amplification circuit adopts the chopper amplifier of zero shift to form.
Claims (1)
1. signal amplifier, it is characterized in that: described signal amplifier comprises the electric bridge amplifying circuit, the electric bridge amplifying circuit is made of transducer and operational amplifier, toggle switch is set in order to control enlargement ratio and zeroing scope in the electric bridge amplifying circuit, enter a differential amplifier circuit after the input end signal of the transducer process LC filtering in the electric bridge amplifying circuit, signal is exaggerated in differential amplifier circuit, amplifying signal through the isolation of a photoelectric isolating circuit and output after, through signal output after the one-level RC filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220397434 CN202798589U (en) | 2012-08-13 | 2012-08-13 | Signal amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220397434 CN202798589U (en) | 2012-08-13 | 2012-08-13 | Signal amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798589U true CN202798589U (en) | 2013-03-13 |
Family
ID=47825758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220397434 Expired - Fee Related CN202798589U (en) | 2012-08-13 | 2012-08-13 | Signal amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202798589U (en) |
-
2012
- 2012-08-13 CN CN 201220397434 patent/CN202798589U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20130813 |