CN202928665U - Unbalanced bridge sensitive electronic scale - Google Patents
Unbalanced bridge sensitive electronic scale Download PDFInfo
- Publication number
- CN202928665U CN202928665U CN 201220675187 CN201220675187U CN202928665U CN 202928665 U CN202928665 U CN 202928665U CN 201220675187 CN201220675187 CN 201220675187 CN 201220675187 U CN201220675187 U CN 201220675187U CN 202928665 U CN202928665 U CN 202928665U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- voltage follower
- unbalanced bridge
- sensitive electronic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to an unbalanced bridge sensitive electronic scale, which comprises an induced circuit, a filter amplifying circuit, a keyboard, an A/D converting circuit, a singlechip circuit, a display, an unbalanced bridge circuit and a voltage follower. The induced circuit is sequentially connected with the filter amplifying circuit, the A/D converting circuit and the singlechip circuit. The singlechip circuit is respectively connected with the display and the keyboard. The induced circuit comprises an unbalanced bridge circuit which is composed of high-precision fixed resistors R1, R2 and R3 and a piezoresistor Rx. The unbalanced bridge circuit is connected with a constant voltage power supply E. a subcircuit of the unbalanced bridge circuit is connected with a voltage follower. A voltage output end of the voltage follower is connected with an electronic voltmeter V. the voltage follower is connected with the constant voltage power supply E. The electronic scale has high sensitivity and precision, and has good practical values.
Description
Technical field
The utility model relates to a kind of weighing apparatus, the sensitive electronic scales of especially a kind of nonequilibrium bridge.
Background technology
Electronic scales is for measuring the instrument of mass of object, and traditional electronic scales in use exists degree of accuracy and the relatively poor problem of sensitivity, can't satisfy the demand of the situation of accurately weighing for some needs.
The utility model content
In order to address the above problem, the utility model proposes the sensitive electronic scales of a kind of nonequilibrium bridge, this electronic scales sensitivity and degree of accuracy are high, have practical value preferably.
The technical scheme that its technical matters that solves the utility model adopts is: the sensitive electronic scales of this nonequilibrium bridge comprises sensor circuit, filter amplification circuit, keyboard, A/D change-over circuit, single chip circuit, display, non-equilibrium bridge circuit and voltage follower; Described sensor circuit order is connected with filter amplification circuit, A/D change-over circuit and single chip circuit, and described single chip circuit is connected with display and keyboard respectively; Described sensor circuit comprises one by high precision fixed resistance R
1,R
2, R
3And voltage dependent resistor (VDR) R
xThe non-equilibrium bridge circuit that forms, described non-equilibrium bridge circuit is connected with a constant voltage source E; Connect a voltage follower on the branch road of described non-equilibrium bridge circuit, the voltage output end of described voltage follower is connected with the electronic voltage Table V; Described voltage follower is connected with constant voltage source E.
The beneficial effects of the utility model are: the sensitive electronic scales sensitivity of this nonequilibrium bridge and degree of accuracy are high, have practical value preferably.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Accompanying drawing 1 is the structural representation of the sensitive electronic scales of this nonequilibrium bridge.
Accompanying drawing 2 is the sensor circuit figure of the sensitive electronic scales of this nonequilibrium bridge.
In figure, 1. sensor circuit, 2. filter amplification circuit, 3. keyboard, 4.A/D change-over circuit, 5. single chip circuit, 6. display, 7. non-equilibrium bridge circuit, 8. voltage follower.
Embodiment
In the accompanying drawings, the sensitive electronic scales of this nonequilibrium bridge comprises sensor circuit 1, filter amplification circuit 2, keyboard 3, A/D change-over circuit 4, single chip circuit 5, display 6, non-equilibrium bridge circuit 7 and voltage follower 8; Described sensor circuit 1 order is connected with filter amplification circuit 2, A/D change-over circuit 4 and single chip circuit 5, and described single chip circuit 5 is connected with display 6 and keyboard 3 respectively; Described sensor circuit 1 comprises one by high precision fixed resistance R
1,R
2, R
3And voltage dependent resistor (VDR) R
xThe non-equilibrium bridge circuit 7 that forms, described non-equilibrium bridge circuit 7 is connected with a constant voltage source E; Connect a voltage follower 8 on the branch road of described non-equilibrium bridge circuit 7, the voltage output end of described voltage follower 8 is connected with the electronic voltage Table V; Described voltage follower 8 is connected with constant voltage source E.
Described high precision fixed resistance R
1, R
2, R
3Resistance equate.
E is constant voltage source; Voltage follower 8 can reduce the impact that voltage table V produces circuit, thereby makes the weighing value more accurate.
As can be seen from Figure 2, the voltage input end a ' b ' of voltage follower 8 is connected with the voltage output end ab of non-equilibrium bridge circuit 7, its E
+, E
-End is connected with the positive and negative electrode of constant voltage source E respectively, voltage output end a ' ' b of described voltage follower 8 " between connecting electronic voltage table V; when the input resistance of voltage follower 8 is very big; the voltage that the electronic voltage Table V measures is namely the voltage between the voltage output end ab of non-balance bridge circuit 7, i.e. U
o=U
oc
To the object weighing time, voltage dependent resistor (VDR) R
xStressed having a resistance, non-equilibrium bridge circuit 7 output voltages read and are sent to single chip circuit 5 by the electronic voltage Table V, and 5 pairs of data of single chip circuit are processed and are calculated, that is, because Uo=
So, R
x=
, draw R
xResistance, and the weight that resistance value is converted to article shows by display 6.
Claims (2)
1. the sensitive electronic scales of nonequilibrium bridge, comprise sensor circuit (1), filter amplification circuit (2), keyboard (3), A/D change-over circuit (4), single chip circuit (5), display (6), non-equilibrium bridge circuit (7) and voltage follower (8); Described sensor circuit (1) order is connected with filter amplification circuit (2), A/D change-over circuit (4) and single chip circuit (5), and described single chip circuit (5) is connected with display (6) and keyboard (3) respectively; It is characterized in that: described sensor circuit (1) comprises one by high precision fixed resistance R
1,R
2, R
3And voltage dependent resistor (VDR) R
xThe non-equilibrium bridge circuit (7) that forms, described non-equilibrium bridge circuit (7) is connected with a constant voltage source E; Connect a voltage follower (8) on the branch road of described non-equilibrium bridge circuit (7), the voltage output end of described voltage follower (8) is connected with the electronic voltage Table V; Described voltage follower (8) is connected with constant voltage source E.
2. the sensitive electronic scales of a kind of nonequilibrium bridge according to claim 1, is characterized in that: described high precision fixed resistance R
1, R
2, R
3Resistance equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220675187 CN202928665U (en) | 2012-12-10 | 2012-12-10 | Unbalanced bridge sensitive electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220675187 CN202928665U (en) | 2012-12-10 | 2012-12-10 | Unbalanced bridge sensitive electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202928665U true CN202928665U (en) | 2013-05-08 |
Family
ID=48218618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220675187 Expired - Fee Related CN202928665U (en) | 2012-12-10 | 2012-12-10 | Unbalanced bridge sensitive electronic scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202928665U (en) |
-
2012
- 2012-12-10 CN CN 201220675187 patent/CN202928665U/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: 20130508 Termination date: 20131210 |