CN203311202U - Analog output quantity circuit - Google Patents
Analog output quantity circuit Download PDFInfo
- Publication number
- CN203311202U CN203311202U CN2013203177428U CN201320317742U CN203311202U CN 203311202 U CN203311202 U CN 203311202U CN 2013203177428 U CN2013203177428 U CN 2013203177428U CN 201320317742 U CN201320317742 U CN 201320317742U CN 203311202 U CN203311202 U CN 203311202U
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- spare
- wire jumper
- circuit
- triode
- output
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Abstract
The utility model discloses an analog output quantity circuit comprising a magnetic isolation unit, a wave filtering unit and a voltage following circuit, wherein the output end of the voltage following circuit is connected with the first ends of a first jumper wire member and a second jumper wire member, the negative input end of the voltage following circuit is connected with the second end of a third jumper wire member through a resistor, the second end and the third end of the first jumper wire member are connected with the first end of the third jumper wire member through the first resistor, the second end and the third end of the first jumper wire member are connected with the positive output end of the analog output quantity circuit, the third end of the third jumper wire member is suspended in the air, the first end of the third jumper wire member is connected with the second end of the third jumper wire member through a second resistor, the second end of the third jumper wire member is also connected with the third end of the second jumper wire member through a third resistor, and the second end of the second jumper wire member is connected with the negative output end of the analog output quantity circuit. The analog output quantity circuit is advantageous in that multi-type analog quantity output control can be realized through connection of the jumper wire members, and circuit cost is low.
Description
Technical field
The utility model relates to circuit design field, is specifically related to the analogue quantity output circuit of Weighing control instrument.
Background technology
Between traditional weighing instrument and peripheral smart machine, with the communication of 4-20mA analog signals, the analog quantity telecommunication circuit of instrument is carried out outputting analog signal with expensive integrated D/A conversion chip.Therefore make the circuit cost of output circuit high.
Summary of the invention
The analogue quantity output circuit that provides a kind of price comparison cheap is provided the purpose of this utility model.
To achieve these goals, the technical solution of the utility model is as follows: a kind of analogue quantity output circuit, comprise the magnetic isolated location be connected with input end, the output terminal that it is characterized in that this magnetic isolated location is connected with the input end of filter unit, the output terminal of this filter unit is connected with the positive input terminal of voltage follower circuit, the output terminal of described voltage follower circuit is connected with the first end of the second wire jumper spare with the first wire jumper spare, the negative input end of described voltage follower circuit is connected with the second end of the 3rd wire jumper spare by a resistance, the second end of the first wire jumper spare all is connected with the first end of the 3rd wire jumper spare by the first resistance with the 3rd end, the second end of the first wire jumper spare is connected with the positive output end of this analogue quantity output circuit with the 3rd end, the 3rd end of the 3rd wire jumper spare is unsettled, first end at the 3rd wire jumper spare is connected with the second end of the 3rd wire jumper spare by the second resistance, the second end of the 3rd wire jumper spare also is connected with the 3rd end of the second wire jumper spare by the 3rd resistance, the second end of the second wire jumper spare is connected with the negative output terminal of this analogue quantity output circuit.
The utility model can solve with lower cost the problem of the polymorphic type signal output of two kinds of voltage ranges and two kinds of range of current, and possesses polymorphic type analog quantity isolation output function.High-resolution PWM pattern exists the cycle long, and ripple is large, in the utility model scheme, both can guarantee that the response time was short, can guarantee that again its ripple is little.The utility model has the advantage of that the connection by wire jumper spare can realize the control of polymorphic type analog output, and circuit cost is low.
The accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
A kind of analogue quantity output circuit, comprise the magnetic isolated location U11 be connected with input end, the output terminal that it is characterized in that this magnetic isolated location U11 is connected with the input end of filter unit 1, the output terminal of this filter unit 1 is connected with the positive input terminal of voltage follower circuit 2, the output terminal of described voltage follower circuit 2 is connected with the first end of the second wire jumper spare JM3 with the first wire jumper spare JM5, the negative input end of described voltage follower circuit 2 is connected with the second end of the 3rd wire jumper spare JM4 by a resistance R 78, the second end of the first wire jumper spare JM5 all is connected with the first end of the 3rd wire jumper spare JM4 by the first resistance R 83 with the 3rd end, the second end of the first wire jumper spare JM5 is connected with the positive output end OUT+ of this analogue quantity output circuit with the 3rd end, the 3rd end of the 3rd wire jumper spare JM4 is unsettled, first end at the 3rd wire jumper spare JM4 is connected with the second end of the 3rd wire jumper spare JM4 by the second resistance R 81, the second end of the 3rd wire jumper spare JM4 also is connected with the 3rd end of the second wire jumper spare JM3 by the 3rd resistance R 82, the second end of the second wire jumper spare JM3 is connected with the negative output terminal OUT-of this analogue quantity output circuit.
Wherein magnetic isolated location U11 adopts the magnetic isolating device ADuM1200 of ADI company, and function class, like high speed photo coupling, is isolated rear output by pulse-width signal PWMH, the PWML of the control simulation amount that the is used for output of single-chip microcomputer output.R76, R77, R78, C77 form the RC filtering circuit, filter the AC compounent of pulse-width signal, and the dutycycle that DC voltage component equals pulse-width signal is multiplied by reference voltage, is proportional to the analog quantity size of output.Voltage follower circuit comprises a discharge circuit U12, the positive-negative input end of described discharge circuit U12 is the positive-negative input end of voltage follower circuit, the output terminal of this discharge circuit U12 is connected with the base stage of the first triode Q8, the collector of this first triode Q8 is connected with the base stage of the second triode Q2, the collector of the emitter of the first triode Q8 and the second triode Q2 is connected and passes through a resistance R 93 and is connected with the negative voltage side of this discharge circuit U12, the output terminal of this discharge circuit U12 also is connected with the base stage of the 3rd triode Q7 by a resistance R 79, the collector of the 3rd triode Q7 is connected with the emitter of the second triode Q2, between the collector of the second triode Q2 and base stage, be provided with a resistance R 80, the emitter of the 3rd triode Q7 is connected with the positive voltage terminal of discharge circuit U12, the emitter of this first triode Q8 is the output terminal of described voltage follower circuit.The positive output end of described analogue quantity output circuit and negative output terminal are in series with respectively an inductance L 5, L6, between this analogue quantity output circuit positive output end and negative output terminal, be connected with a capacitor C 73, between this analogue quantity output circuit positive output end and negative output terminal and ground, be respectively equipped with capacitor C 72, C74, these inductance and electric capacity form respectively the filtering circuit that prevents external disturbance and the leadage circuit of static discharge.
By magnetic isolated location U11, the pwm signal of input end is isolated, and be converted to more stable 5V pulse signal by voltage reference circuit U13, after the RC filtering circuit, obtain the DC voltage of a direct ratio and PWM, circuit, by the voltage follow principle of amplifier U12, makes the voltage that the B on resistance R 82 is ordered only depend on the DC voltage (A point voltage) obtained after the RC filtering circuit.(jumper: connect first end and the second end of the first wire jumper spare JM5, connect the second end and the 3rd end of the second wire jumper spare JM3, connect first end and the second end of the 3rd wire jumper spare JM4 when being operated in voltage mode 0 ~ 5V.), R81 is by short circuit, and mark A point PWM output voltage is U
A, OUT+ and OUT-both end voltage are (R82+R83) * U
A/ R82, the voltage at these two ends passes through to change the pulsewidth voltage of A point PWM, thereby realizes the 0-5V analog output.Illustrate, if A point PWM output voltage is 4.8V, now OUT+ and OUT-are just in time 5V.Equally, in the time will exporting 0-10V (the first wire jumper spare and the second wire jumper spare are the same, connect the second end and the 3rd end of the 3rd wire jumper spare), OUT+ and OUT-both end voltage are by (R81+R82+R83) * U
A/ R82 determines, can realize the 0-10V analog output.(jumper: the second end and the 3rd end that connect the first wire jumper spare JM5 when being operated in the electric current output mode, the first end and the second end that connect the second wire jumper spare JM3, the first end and the second end that connect the 3rd wire jumper spare JM4), in figure, the electric current at OUT+ and OUT-two ends depends on the electric current on R82, and it is irrelevant with load, when maximum pwm signal output, B point voltage maximum can arrive 5V, now the maximum current on R82 can arrive 5/240=20.8mA, therefore can realize by the pulsewidth that changes PWM the output adjustment of 4-20mA scope.
Claims (6)
1. analogue quantity output circuit, comprise the magnetic isolated location be connected with input end, the output terminal that it is characterized in that this magnetic isolated location is connected with the input end of filter unit, the output terminal of this filter unit is connected with the positive input terminal of voltage follower circuit, the output terminal of described voltage follower circuit is connected with the first end of the second wire jumper spare with the first wire jumper spare, the negative input end of described voltage follower circuit is connected with the second end of the 3rd wire jumper spare by a resistance, the second end of the first wire jumper spare all is connected with the first end of the 3rd wire jumper spare by the first resistance with the 3rd end, the second end of the first wire jumper spare is connected with the positive output end of this analogue quantity output circuit with the 3rd end, the 3rd end of the 3rd wire jumper spare is unsettled, first end at the 3rd wire jumper spare is connected with the second end of the 3rd wire jumper spare by the second resistance, the second end of the 3rd wire jumper spare also is connected with the 3rd end of the second wire jumper spare by the 3rd resistance, the second end of the second wire jumper spare is connected with the negative output terminal of this analogue quantity output circuit.
2. analogue quantity output circuit as claimed in claim 1, it is characterized in that voltage follower circuit comprises a discharge circuit, the positive-negative input end of described discharge circuit is the positive-negative input end of voltage follower circuit, the output terminal of this discharge circuit is connected with the base stage of the first triode, the collector of this first triode is connected with the base stage of the second triode, the collector of the emitter of the first triode and the second triode is connected and passes through a resistance and is connected with the negative voltage side of this discharge circuit, the output terminal of this discharge circuit also is connected with the base stage of the 3rd triode by a resistance, the collector of the 3rd triode is connected with the emitter of the second triode, between the collector of the second triode and base stage, be provided with a resistance, the emitter of the 3rd triode Q7 is connected with the positive voltage terminal of discharge circuit, the emitter of this first triode is the output terminal of described voltage follower circuit.
3. analogue quantity output circuit as claimed in claim 1, the positive output end and the negative output terminal that it is characterized in that described analogue quantity output circuit are in series with respectively an inductance, between this analogue quantity output circuit positive output end and negative output terminal, be connected with an electric capacity, be respectively equipped with electric capacity between this analogue quantity output circuit positive output end and negative output terminal and ground.
4. analogue quantity output circuit as described as any one in claim 1 ~ 3, is characterized in that connecting first end and second end of the first wire jumper spare, connects the second end and the 3rd end of the second wire jumper spare, connects first end and second end of the 3rd wire jumper spare.
5. analogue quantity output circuit as described as any one in claim 1 ~ 3, is characterized in that connecting first end and second end of the first wire jumper spare, connects the second end and the 3rd end of the second wire jumper spare, and the 3rd wire jumper spare selects to connect the second end and the 3rd end.
6. analogue quantity output circuit as described as any one in claim 1 ~ 3, is characterized in that connecting the second end and the 3rd end of the first wire jumper spare, connects first end and second end of the second wire jumper spare, connects first end and second end of the 3rd wire jumper spare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203177428U CN203311202U (en) | 2013-06-04 | 2013-06-04 | Analog output quantity circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203177428U CN203311202U (en) | 2013-06-04 | 2013-06-04 | Analog output quantity circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203311202U true CN203311202U (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203177428U Expired - Lifetime CN203311202U (en) | 2013-06-04 | 2013-06-04 | Analog output quantity circuit |
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| Country | Link |
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| CN (1) | CN203311202U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104850164A (en) * | 2015-05-29 | 2015-08-19 | 成都瑞联电气股份有限公司 | Circuit composed of three operational amplifiers and capable of outputting four types of analog signals in configurable manner |
-
2013
- 2013-06-04 CN CN2013203177428U patent/CN203311202U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104850164A (en) * | 2015-05-29 | 2015-08-19 | 成都瑞联电气股份有限公司 | Circuit composed of three operational amplifiers and capable of outputting four types of analog signals in configurable manner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |
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| CX01 | Expiry of patent term |