CN2775937Y - Two line passive analogue signalisolation amplifier - Google Patents
Two line passive analogue signalisolation amplifier Download PDFInfo
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- CN2775937Y CN2775937Y CN 200520057066 CN200520057066U CN2775937Y CN 2775937 Y CN2775937 Y CN 2775937Y CN 200520057066 CN200520057066 CN 200520057066 CN 200520057066 U CN200520057066 U CN 200520057066U CN 2775937 Y CN2775937 Y CN 2775937Y
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- analog signal
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Abstract
The utility model relates to a passive analog signal isolation amplifier of double lines, which comprises a hybrid integrated circuit which can isolate and convert analog signals according to proportions and can realize the isolation of electric current loops or the signal conversion of the mode of inputting one signal and outputting two signals and the mode of inputting two signals and outputting two signals, etc. The utility model comprises a modulation-demodulation circuit of current signals, a conversion circuit of signal coupling and isolation, etc., wherein after passing through an operational amplifier U11, input signals enter a photoelectric coupler U12 and are output through the isolation of the photoelectric coupler. The technique is suitable for the circuit designs with big differences of ground potential in the systems of industrial control, medical equipment, instruments, etc. and has a high level of performance integration, therefore the crossing of isolation barriers can realize more complicated operation which can not be done in the past. The utility model realizes the advantages of low cost, small size, high precision and multiple functions.
Description
Technical field
The utility model relates to integrated circuit (IC), mainly be meant and a kind ofly can be applied in the analog signal data collection, isolate transmission and power supply, transmission of industry spot Signal Spacing and conversion, ground wire disturbs and suppresses, the long-range undistorted transmission of signal, the passive analog signal isolated amplifier of two lines of the isolated variable of instrument and meter and sensor signal and power equipment and Medical Instruments safety isolated gate etc.
Background technology
Signal Isolation Technology is to make analog signal not exist the electric current that passes through barrier between transmission and the receiving terminal to connect when sending.This allow to send and the receiving terminal ground or the difference of reference level outward can be up to several kilovolts, and has prevented to damage the differently loop current between the current potential of signal.The noise of signal ground can make signal impaired.Isolation can make Signal Separation to a clean signaling subsystem ground between transducer, instrument and meter or control system and the power supply and isolate mutually, thus the work safety of assurance whole system device, reliable and stable.
And in another kind was used, the electrical connection between the reference level can be isolated and produces one for operating personnel or the unsafe current path of patient.
The Signal Spacing device depends on no transmitter and recipient is crossed over isolation barrier, and this device once was used for digital signal, realizes but linearization problem forces analog signal to isolate devices such as adopting transformer, photoelectronic coupler, electric capacity or photocell.
Analog signal is isolated: in many systems, analog signal must be isolated.The circuit parameter that analog signal is considered is different from digital signal fully.
Analog signal will be considered earlier usually: the precision or the linearity, frequency response, noise etc.Be the requirement to power supply then, the high isolation of power requirement, high accuracy, low noise are particularly to input stage.The basic accuracy or the linearity that also should pay close attention to isolated amplifier can not rely on the application corresponding circuit to improve, but these circuit can reduce noise and reduce the input stage power requirement.
Another problem to Signal Spacing is the required power consumption of isolated amplifier input stage.And the input impedance of isolated amplifier and the equivalent resistance of self are the key points of problem.And output stage is a benchmark with casing or ground usually, and input stage is floated usually on another current potential.Therefore, the power supply of input stage also must be isolated.
Summary of the invention
The purpose of this utility model provides the passive analog signal isolated amplifier of a kind of two lines, in order to solve the deficiencies in the prior art.
The realization the technical solution of the utility model is: the passive analog signal isolated amplifier of this two lines comprises the hybrid integrated circuit that analog signal is isolated in proportion and changed, and can realize that electric current loop is isolated or signal one-in-and-two-out, two advances two and conversion such as goes out; Its major technique is to include current signal modulation-demodulation circuit, signal coupling isolated variable circuit etc., wherein after the input signal process operational amplifier U11, enters photoelectrical coupler U12, exports after photoelectric coupler isolation.
This technical scheme also comprises:
Described 4-20mA direct current signal forward is by reverse connecting protection diode D1; after C1 filtering, get back to the negative terminal of 4-20mA by resistance R 1, R2, IC1; C2, C3, C4, L1 produce vibration simultaneously; through passing to L2 after the IC2 modulation; control high isolating transformer T1 vibration through L2, C5, C6 are by discharging and recharging to T1 compensation energy.Signal is delivered to the secondary of transformer by electromagnetic coupled, then through D1, D2, C7, C8, the reduction of C9 demodulator circuit, again by output 4-20mA direct current signal after the band-pass filter of C10, C11, L3 composition.
The signal input Low ESR of described 4-20mA signal isolator is handled, the equivalent resistance of entire circuit is very little, make the magnitude of voltage of input signal reach super wide range: 7.5～32VDC, the pressure drop of signal is less than 2.5V, to satisfy the needs of the undistorted transmission of Chief Signal Boatswain line after this isolator of process.
What the coupling transformer of described signal isolator adopted is a kind of high Q value, low permeability, low-impedance magnet ring.With guarantee signal can high accuracy (0.1%), the undistorted transmission of high linearity (0.2%).
The internal circuit of described signal isolator adopts wide creepage distance, and the effective measures of high-quality magnet wire insulation make the input of signal and the isolation voltage between the output reach 3KVAC (5KVDC).
Ceramic substrate is adopted in the inside of described signal isolator, vacuumizes the fire proofing embedding, improves the heat-sinking capability and the reliability of entire product. make the wide temperature that product can be in technical grade-45～+ 85 ℃, long-term work under the moist vibration environment.
Installing and using of described signal isolator is easy, need not the repertoire that external any components and parts can be realized product during use.If pack in the guide rail box, cold installing and using on the guide rail of control apparatus at the scene.And
Described 12 pin encapsulation IC pinout is: 1 signal input lin+; 2 signals input GND; 9,10 signals output Io-; 11,12 signals output Io+.
The beneficial effects of the utility model are: this technology is applicable to that earth potential in the systems such as Industry Control, Medical Devices, instrument and meter has in the circuit design of big difference very.Have the integrated high level of performance and make the leap isolation barrier can realize the more complicated operations of in the past not accomplishing, realized low cost, small size, high accuracy, multi-functional.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is a theory diagram of the present utility model.
Fig. 3 is overall dimensions figure of the present utility model.
Fig. 4 is 12 pin packaging pin wiring description figure of the present utility model.
Embodiment
Passive IC inside includes current signal modulation-demodulation circuit, signal coupling isolated variable circuit etc., very little input equivalent resistance, make the input voltage of this IC reach super wide range (7.5-32V), realize that to satisfy user's dispense with outer connecting power signal is remote, the needs of undistorted transmission.Inner ceramic substrate, printed resistor technology and new technology quarantine measures make device can reach the on-the-spot adverse circumstances requirement of 3KVAC insulation voltage and the wide temperature of technical grade, humidity, vibrations.This chip is very easy to use, need not that external any element can realize that the 4-20mA electric current loop is isolated or signal one-in-and-two-out, two advances two and mapping function such as goes out.
For the interference of power supply noise, can adopt modulated carrier to make analog signal cross over this barrier.As the passive isolated amplifier (see figure 2) of two lines simulation being isolated simplifies.Input signal is modulated by duty cycle and is striden across barrier with the digital form transmission.Output receives modulated signal, analog signal is returned in its conversion remove ripple composition intrinsic in the modulating/demodulating process.
Installing and using of described signal isolator is easy, need not the repertoire that external any components and parts can be realized product during use.If pack in the guide rail box, cold installing and using on the guide rail of control apparatus at the scene.The beneficial effects of the utility model are: this technology is applicable to that earth potential in the systems such as Industry Control, Medical Devices, instrument and meter has in the circuit design of big difference very; Have the integrated high level of performance and make the leap isolation barrier can realize the more complicated operations of in the past not accomplishing, realized low cost, small size, high accuracy, multi-functional.
The characteristic of present technique:
Accuracy class: 0.1 grade, 0.2 grade, 0.5 grade;
The interior high linearity of gamut scope (nonlinearity＜0.2% 〉;
International standard signal: 0-10mA/0-20mA/4-20mA I/O;
Super wide range signal input voltage: 7.5～32V;
Have the anti-group of low input (pressure drop＜2.5V) and output high load capability;
Low cost, small size, the single-row SIP12 pin of standard IC encapsulation;
The technical grade operating temperature range meets the fire proofing vacuum encapsulation of UL-94 standard;
Signal I/O isolation voltage 3KVAC;
Claims (8)
1. passive analog signal isolated amplifier of line, comprise the hybrid integrated circuit that analog signal is isolated in proportion and changed, it is characterized in that including current signal modulation-demodulation circuit, signal coupling isolated variable circuit etc., can realize that electric current loop is isolated or signal one-in-and-two-out, two advances two and conversion such as goes out; Wherein after the input signal process operational amplifier U11, enter photoelectrical coupler U12, after photoelectric coupler isolation, export.
2. the passive analog signal isolated amplifier of two lines as claimed in claim 1; it is characterized in that described 4-20mA direct current signal forward is by reverse connecting protection diode D1; after C1 filtering, get back to the negative terminal of 4-20mA by resistance R 1, R2, IC1; C2, C3, C4, L1 produce vibration simultaneously; through passing to L2 after the IC2 modulation; control high isolating transformer T1 vibration through L2, C5, C6 are by discharging and recharging to T1 compensation energy.Signal is delivered to the secondary of transformer by electromagnetic coupled, then through D1, D2, C7, C8, the reduction of C9 demodulator circuit, again by output 4-20mA direct current signal after the band-pass filter of C10, C11, L3 composition.
3. the passive analog signal isolated amplifier of two lines as claimed in claim 1, the signal input Low ESR that it is characterized in that described 4-20mA signal isolator is handled, the equivalent resistance of entire circuit is very little, make the magnitude of voltage of input signal reach super wide range: 7.5～32VDC, the pressure drop of signal is less than 2.5V after this isolator of process.
4. the passive analog signal isolated amplifier of two lines as claimed in claim 1, what it is characterized in that the coupling transformer of described signal isolator adopts is a kind of high Q value, low permeability, low-impedance magnet ring, with guarantee signal can high accuracy (0.1%), the undistorted transmission of high linearity (0.2%).
5. the passive analog signal isolated amplifier of two lines as claimed in claim 1 is characterized in that the internal circuit of described signal isolator adopts wide creepage distance, and high-quality magnet wire insulation makes the input of signal and the isolation voltage between the output reach 3KVAC-5KVDC.
6. the passive analog signal isolated amplifier of two lines as claimed in claim 1 is characterized in that ceramic substrate is adopted in the inside of described signal isolator, vacuumizes the fire proofing embedding, wide temperature that can anti-technical grade-45～+ 85 ℃, humidity, vibration.
7. the passive analog signal isolated amplifier of two lines as claimed in claim 1 is characterized in that described signal isolator does not have external any components and parts; Pack in the guide rail box, promptly can be used for cold installation on the guide rail of control apparatus at the scene.
8. the passive analog signal isolated amplifier of two lines as claimed in claim 1 is characterized in that described 12 pin encapsulation IC pinout is: 1 signal input lin+; 2 signals input GND; 9,10 signals output Io-; 11,12 signals output Io+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520057066 CN2775937Y (en) | 2005-04-11 | 2005-04-11 | Two line passive analogue signalisolation amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520057066 CN2775937Y (en) | 2005-04-11 | 2005-04-11 | Two line passive analogue signalisolation amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2775937Y true CN2775937Y (en) | 2006-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520057066 Expired - Fee Related CN2775937Y (en) | 2005-04-11 | 2005-04-11 | Two line passive analogue signalisolation amplifier |
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| Country | Link |
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| CN (1) | CN2775937Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551415B (en) * | 2009-03-30 | 2012-07-25 | 福建上润精密仪器有限公司 | Passive power distribution isolator and 0-20mA signal passive isolator |
| CN102937499A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
| CN105519132A (en) * | 2015-07-13 | 2016-04-20 | 深圳市柔宇科技有限公司 | Electronic system denoising device, wearable display device and electronic device |
-
2005
- 2005-04-11 CN CN 200520057066 patent/CN2775937Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551415B (en) * | 2009-03-30 | 2012-07-25 | 福建上润精密仪器有限公司 | Passive power distribution isolator and 0-20mA signal passive isolator |
| CN102937499A (en) * | 2011-08-15 | 2013-02-20 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
| CN102937499B (en) * | 2011-08-15 | 2014-11-19 | 上海朝辉压力仪器有限公司 | Double-isolation type pressure transmitter circuit |
| CN105519132A (en) * | 2015-07-13 | 2016-04-20 | 深圳市柔宇科技有限公司 | Electronic system denoising device, wearable display device and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |