CN202928664U - Bridge circuit's sensitive electronic scale - Google Patents
Bridge circuit's sensitive electronic scale Download PDFInfo
- Publication number
- CN202928664U CN202928664U CN 201220675038 CN201220675038U CN202928664U CN 202928664 U CN202928664 U CN 202928664U CN 201220675038 CN201220675038 CN 201220675038 CN 201220675038 U CN201220675038 U CN 201220675038U CN 202928664 U CN202928664 U CN 202928664U
- Authority
- CN
- China
- Prior art keywords
- circuit
- bridge circuit
- bridge
- keyboard
- 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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Abstract
The utility model relates to a bridge circuit's sensitive electronic scale, which comprises an induced circuit, a filter amplifying circuit, an A/D converting circuit, a singlechip circuit, a display and a keyboard. 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 a bridge circuit composed of a high-precision fixed resistor R1, a high-precision fixed resistor R2, a precision trimming resistor R4 and a piezoresistor R3. A galvanometer G is connected on a branch of the bridge circuit. The bridge circuit is also connected with a power supply, a protective resistor R' and a switch. The electronic scale has high sensitivity and accuracy, 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 bridge circuit.
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 bridge circuit, 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 bridge circuit comprises sensor circuit, filter amplification circuit, A/D change-over circuit, single chip circuit, display and keyboard; 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, high precision fixed resistance R
2, the Precision trimming resistance R
4With voltage dependent resistor (VDR) R
3The bridge circuit that forms connects galvanometer G on the branch road of described bridge circuit; Described bridge circuit also is connected with a power supply, a protective resistance R ' and the switch of.
The beneficial effects of the utility model are: the sensitive electronic scales of this bridge circuit, sensitivity 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 bridge circuit.
Accompanying drawing 2 is the sensor circuit figure of the sensitive electronic scales of this bridge circuit.
In figure, 1. sensor circuit, 2. filter amplification circuit, 3. keyboard, 4.A/D change-over circuit, 5. single chip circuit, 6. display, 7. bridge circuit.
Embodiment
In the accompanying drawings, the sensitive electronic scales of this bridge circuit comprises sensor circuit 1, filter amplification circuit 2, A/D change-over circuit 4, single chip circuit 5, display 6 and keyboard 3; 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, high precision fixed resistance R
2, the Precision trimming resistance R
4With voltage dependent resistor (VDR) R
3The bridge circuit 7 that forms connects galvanometer G on the branch road of described bridge circuit 7; Described bridge circuit 7 also is connected with a power supply, a protective resistance R ' and the switch of.
Described high precision fixed resistance R
1With high precision fixed resistance R
2Resistance equate.
When counterweight object weighing, voltage dependent resistor (VDR) R
3The gravity of experiencing article produces resistance, by keyboard 3 operations, 5 pairs of Precision trimming resistance R of single chip circuit
4Regulate, make bridge circuit 7 be in equilibrium state, namely between ab, electric current is 0, satisfies R in circuit
1* R
3=R
2* R
4, again because R
1=R
2So, R
3=R
4, single chip circuit 5 converts resistance to gravity and shows by display 6.
The sensitive electronic scales of a kind of bridge circuit that the utility model proposes, the exact value of its measurement can reach 0.01%.
Claims (1)
1. the sensitive electronic scales of bridge circuit, comprise sensor circuit (1), filter amplification circuit (2), A/D change-over circuit (4), single chip circuit (5), display (6) and keyboard (3); 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, high precision fixed resistance R
2, the Precision trimming resistance R
4With voltage dependent resistor (VDR) R
3The bridge circuit (7) that forms connects galvanometer G on the branch road of described bridge circuit (7); Described bridge circuit (7) also is connected with a power supply, a protective resistance R ' and the switch of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220675038 CN202928664U (en) | 2012-12-10 | 2012-12-10 | Bridge circuit's sensitive electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220675038 CN202928664U (en) | 2012-12-10 | 2012-12-10 | Bridge circuit's sensitive electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202928664U true CN202928664U (en) | 2013-05-08 |
Family
ID=48218617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220675038 Expired - Fee Related CN202928664U (en) | 2012-12-10 | 2012-12-10 | Bridge circuit's sensitive electronic scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202928664U (en) |
-
2012
- 2012-12-10 CN CN 201220675038 patent/CN202928664U/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 |