CN203574613U - Single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier - Google Patents
Single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier Download PDFInfo
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- CN203574613U CN203574613U CN201320651984.0U CN201320651984U CN203574613U CN 203574613 U CN203574613 U CN 203574613U CN 201320651984 U CN201320651984 U CN 201320651984U CN 203574613 U CN203574613 U CN 203574613U
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Abstract
The utility model provides a single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier. The single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier is composed of a reference voltage unit, a positive voltage and negative voltage converting unit and a Wheatstone bridge amplifier unit, wherein the reference voltage unit is connected with the Wheatstone bridge amplifier unit, the positive voltage and negative voltage converting unit is also connected with the Wheatstone bridge amplifier unit, the reference voltage unit provides high-precision and low-temperature-drift voltage for a bridge arm of a Wheatstone bridge through a high-precision three-end voltage reference circuit, the output precision of the bridge is improved, the positive voltage and negative voltage converting unit converts positive voltage into negative voltage through a one-chip non-isolated DC/DC converting circuit to provide electricity for an operational amplifier, and as a result, both positive voltage and negative voltage can be output by the Wheatstone bridge amplifier. The single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier has the advantages that the circuit structure is simple, using is convenient, bipolar voltage output of the Wheatstone bridge is achieved under the condition that a unipolar power supply is adopted for supplying power, a path of input voltage is saved, and cost is reduced greatly.
Description
Technical field
The utility model belongs to field of electronic devices, is specifically related to the Wheatstone bridge amplifier of a kind of single supply input duplicate supply output.
Background technology
In existing amplifier circuit, if adopt single positive supply power supply, amplifier output must be positive voltage output, and can not export negative voltage; Can realize in the amplifying circuit of bipolar voltage output, supply power mode is all negative and positive dual power power supply, and this dual power supply has caused the significant wastage of cost; In addition, existing amplifier circuit adopts printed board (pcb board) and plastic device manufacture, there is the shortcomings such as volume is large, operating temperature range is narrow, poor reliability, development along with electronic device, the volume of circuit module, working temperature, reliability etc. are had higher requirement, under some special environment for use, traditional PCB printed circuit cannot meet instructions for use.
Utility model content
The utility model, for problems of the prior art, provides the Wheatstone bridge amplifier of a kind of single supply input duplicate supply output.
A Wheatstone bridge amplifier for single supply input duplicate supply output, comprises supply voltage VCC, and reference voltage unit, also comprises generating positive and negative voltage converting unit and Wheatstone bridge amplifier unit; The output of described supply voltage VCC connects respectively the input of reference voltage unit and generating positive and negative voltage converting unit, and the output of reference voltage unit and generating positive and negative voltage converting unit is connected with Wheatstone bridge amplifier unit respectively.
Described reference voltage unit is three terminal voltage reference circuits.
Described generating positive and negative voltage converting unit is used one chip non-isolation DC/DC change-over circuit.
Described reference voltage unit comprises that the voltage input end of the first IC circuit 1, the first IC circuit 1 connects supply voltage VCC, and the first common port of the first IC circuit 1 connects GND, and the reference voltage output end of the first IC circuit 1 connects Wheatstone bridge amplifier unit;
Described generating positive and negative voltage converting unit comprises second circuit IC2, diode D1, inductance L 1; The voltage input end of second circuit IC2 connects supply voltage VCC, the feedback input end of second circuit IC2 connects one end of the first inductance L 1 and the negative electrode of diode D1, the other end of inductance L 1 connects GND, the switching voltage output of second circuit IC2 connects the anode of diode D1, the second common port of second circuit IC2 connects GND, the control input end of second circuit IC2 connects the switching voltage output of second circuit IC2, and the switching voltage output of second circuit IC2 connects Wheatstone bridge amplifier unit;
Described Wheatstone bridge amplifier unit comprises tertiary circuit IC3, the positive voltage input of tertiary circuit IC3 connects supply voltage VCC, the in-phase input end of tertiary circuit IC3 is connected and ground connection with the reference voltage output end of the first IC circuit 1 by resistance, the inverting input of tertiary circuit IC3 is connected with the reference voltage output end of the first IC circuit 1 by resistance, the negative voltage input of tertiary circuit IC3 connects the switching voltage output of the second circuit IC2 of generating positive and negative voltage converting unit, and the amplifier output of tertiary circuit IC3 is exported and ground connection by resistance.
The Wheatstone bridge amplifier of a kind of single supply input duplicate supply of the present utility model output, adopt high accuracy, Low Drift Temperature, the trifocal fiducial chip of high stability provides input reference voltage for electric bridge, adopt the integrated DC/DC electric pressure converter of the non-isolation of one chip chip, the supply voltage of positive polarity is converted to reverse voltage, for the high precision operating amplifier in bridge circuit provides negative voltage, the output that makes operational amplifier not only can output cathode voltage but also can output negative pole voltage, thereby realized the function of single supply input duplicate supply output.
The relative prior art of the utility model has the following advantages:
1, the utility model circuit structure is simple, easy to use, adopts unipolarity Power supply to realize the function of the bipolar voltage output of Wheatstone bridge, thereby saves Liao Yi road input voltage, has saved greatly cost;
2, the utility model has adopted the operational amplifier of the trifocal fiducial chip of high accuracy, Low Drift Temperature, high stability and high accuracy, low drift, low imbalance to make the output of electric bridge to have the characteristic of high accuracy, Low Drift Temperature.
3, the utility model adopts the integrated DC/DC electric pressure converter of the non-isolation of one chip chip, and the supply voltage of positive polarity is converted to reverse voltage, has conversion efficiency high, the feature that output accuracy is high.
4, the utility model circuit adopts the manufacture of thick film hybrid integrated circuit technique, and reliability is high, and operating temperature range is wide, and maximum temperature can reach 125 ℃, minimum reaching-55 ℃.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the Wheatstone bridge amplifier of a kind of single supply input duplicate supply of the present utility model output is described in further detail.
As shown in Figure 1, the Wheatstone bridge amplifier of a kind of single supply input duplicate supply of the present utility model output, reference voltage unit 1, generating positive and negative voltage converting unit 2, Wheatstone bridge amplifier unit Unit 3 three, consist of, described reference voltage unit 1 connects amplifier of electrical bridge unit 3; Described generating positive and negative voltage converting unit 2 connects Wheatstone bridge amplifier unit 3; Reference voltage unit 1 is used high-precision three terminal voltage reference circuits to provide high accuracy to the brachium pontis of Wheatstone bridge, the reference voltage of Low Drift Temperature, improve the output accuracy of electric bridge, generating positive and negative voltage converting unit 2 is used one chip non-isolation DC/DC change-over circuit, positive voltage is converted into negative voltage, to operational amplifier power supply, make both also exportable negative voltages of exportable positive voltage of Wheatstone bridge amplifier.
Reference voltage unit 1 comprises the first IC circuit 1, the first capacitor C 1, the second capacitor C 2; One end of the first capacitor C 1 connects supply voltage VCC, and the other end connects GND; One end of the second capacitor C 2 connects supply voltage VCC, and the other end connects GND; The voltage input end of the first IC circuit 1 connects supply voltage VCC, and the first common port of the first IC circuit 1 connects GND, and the reference voltage output end of the first IC circuit 1 connects Wheatstone bridge amplifier unit 3.
Generating positive and negative voltage converting unit 2 comprises second circuit IC2, the 4th capacitor C 4, the five capacitor C 5, the first diode D1, the first inductance L 1, the voltage input end of second circuit IC2 connects supply voltage VCC, the feedback input end of second circuit IC2 connects one end of the first inductance L 1, the feedback input end of second circuit IC2 connects the negative electrode of the first diode D1, the switching voltage output of second circuit IC2 connects the anode of the first diode D1, the second common port of second circuit IC2 connects GND, the control input end of second circuit IC2 connects the switching voltage output of second circuit IC2, the other end of the first inductance L 1 connects GND, one end of the 4th capacitor C 4 connects the switching voltage output of second circuit IC2, one end of the 5th capacitor C 5 connects the switching voltage output of second circuit IC2, the other end of the 4th capacitor C 4 connects GND, the other end of the 5th capacitor C 5 connects GND, the switching voltage output of second circuit IC2 connects Wheatstone bridge amplifier unit 3.
Wheatstone bridge amplifier unit 3 comprises tertiary circuit IC3, the 3rd capacitor C 3, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the four resistance R 4, the five resistance R 5, the six resistance R 6, the 7th resistance R 7, the eight resistance R 8, the nine resistance R 9, the ten resistance R 10, one end of the first resistance R 1 connects the reference voltage output end of the first IC circuit 1 of reference voltage unit, the other end of the first resistance R 1 connects one end of the 4th resistance R 4, one end of the second resistance R 2 connects the reference voltage output end of the first IC circuit 1 of reference voltage unit, the other end of the second resistance R 2 connects one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 connects the in-phase input end of tertiary circuit IC3, the other end of the 4th resistance R 4 connects the inverting input of tertiary circuit IC3, one end of the 5th resistance R 5 connects the inverting input of tertiary circuit IC3, the other end of the 5th resistance R 5 connects one end of the 6th resistance R 6, the other end of the 6th resistance R 6 connects one end of the tenth resistance R 10, the other end of the tenth resistance R 10 connects the output of Wheatstone bridge amplifier unit 3, one end of the 7th resistance R 7 connects the in-phase input end of tertiary circuit IC3, the other end of the 7th resistance R 7 connects one end of the 8th resistance R 8, the other end of the 8th resistance R 8 connects GND, one end of the 9th resistance R 9 connects one end of the tenth resistance R 10, the other end of the 9th resistance R 9 connects the amplifier output of tertiary circuit IC3, one end of the 3rd capacitor C 3 connects one end of the 9th resistance R 9, the other end of the 3rd capacitor C 3 connects GND, the positive voltage input of tertiary circuit IC3 connects supply voltage VCC, the negative voltage input of tertiary circuit IC3 connects the switching voltage output of the second circuit IC2 of generating positive and negative voltage converting unit.
The utility model adopts the manufacture of thick film hybrid integrated circuit technique to produce, and adopts bare chip assembling, and the full level Hermetic Package of metal dual-in-line has that volume is little, operating temperature range is wide, high reliability.
Claims (4)
1. a Wheatstone bridge amplifier for single supply input duplicate supply output, comprises supply voltage VCC, and reference voltage unit (1), is characterized in that: also comprise generating positive and negative voltage converting unit (2) and Wheatstone bridge amplifier unit (3); The output of described supply voltage VCC connects respectively the input of reference voltage unit (1) and generating positive and negative voltage converting unit (2), and the output of reference voltage unit (1) and generating positive and negative voltage converting unit (2) is connected with Wheatstone bridge amplifier unit (3) respectively.
2. the Wheatstone bridge amplifier of a kind of single supply input duplicate supply as claimed in claim 1 output, is characterized in that: described reference voltage unit (1) is three terminal voltage reference circuits.
3. the Wheatstone bridge amplifier of a kind of single supply input duplicate supply as claimed in claim 2 output, is characterized in that: described generating positive and negative voltage converting unit (2) is used one chip non-isolation DC/DC change-over circuit.
4. the Wheatstone bridge amplifier that a kind of single supply input duplicate supply is exported as claimed any one in claims 1 to 3, is characterized in that:
Described reference voltage unit (1) comprises the first IC circuit 1, the voltage input end of the first IC circuit 1 connects supply voltage VCC, the first common port of the first IC circuit 1 connects GND, and the reference voltage output end of the first IC circuit 1 connects Wheatstone bridge amplifier unit (3);
Described generating positive and negative voltage converting unit (2) comprises second circuit IC2, diode D1, inductance L 1; The voltage input end of second circuit IC2 connects supply voltage VCC, the feedback input end of second circuit IC2 connects one end of the first inductance L 1 and the negative electrode of diode D1, the other end of inductance L 1 connects GND, the switching voltage output of second circuit IC2 connects the anode of diode D1, the second common port of second circuit IC2 connects GND, the control input end of second circuit IC2 connects the switching voltage output of second circuit IC2, and the switching voltage output of second circuit IC2 connects Wheatstone bridge amplifier unit (3);
Described Wheatstone bridge amplifier unit (3) comprises tertiary circuit IC3, the positive voltage input of tertiary circuit IC3 connects supply voltage VCC, the in-phase input end of tertiary circuit IC3 is connected and ground connection with the reference voltage output end of the first IC circuit 1 by resistance, the inverting input of tertiary circuit IC3 is connected with the reference voltage output end of the first IC circuit 1 by resistance, the negative voltage input of tertiary circuit IC3 connects the switching voltage output of the second circuit IC2 of generating positive and negative voltage converting unit, and the amplifier output of tertiary circuit IC3 is exported and ground connection by resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320651984.0U CN203574613U (en) | 2013-10-22 | 2013-10-22 | Single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320651984.0U CN203574613U (en) | 2013-10-22 | 2013-10-22 | Single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574613U true CN203574613U (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320651984.0U Expired - Fee Related CN203574613U (en) | 2013-10-22 | 2013-10-22 | Single-power-supply-input and double-power-supply-output Wheatstone bridge amplifier |
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| Country | Link |
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| CN (1) | CN203574613U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646018A (en) * | 2019-09-12 | 2020-01-03 | 东南大学 | High-frequency current source Wheatstone bridge detection circuit realized by low-speed operational amplifier |
| CN114785288A (en) * | 2022-06-20 | 2022-07-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Amplifier power supply circuit of balance bridge and bridge amplifying circuit |
-
2013
- 2013-10-22 CN CN201320651984.0U patent/CN203574613U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646018A (en) * | 2019-09-12 | 2020-01-03 | 东南大学 | High-frequency current source Wheatstone bridge detection circuit realized by low-speed operational amplifier |
| CN110646018B (en) * | 2019-09-12 | 2021-10-19 | 东南大学 | High-frequency current source Wheatstone bridge detection circuit realized by low-speed operational amplifier |
| CN114785288A (en) * | 2022-06-20 | 2022-07-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Amplifier power supply circuit of balance bridge and bridge amplifying circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20191022 |