CN101551415B - Passive power distribution isolator and 0-20mA signal passive isolator - Google Patents
Passive power distribution isolator and 0-20mA signal passive isolator Download PDFInfo
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- CN101551415B CN101551415B CN2009101113716A CN200910111371A CN101551415B CN 101551415 B CN101551415 B CN 101551415B CN 2009101113716 A CN2009101113716 A CN 2009101113716A CN 200910111371 A CN200910111371 A CN 200910111371A CN 101551415 B CN101551415 B CN 101551415B
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Abstract
The invention discloses a passive power distribution isolator and 0-20mA signal passive isolator, pertaining to the passive isolator used in electric control line products. The present invention provides a passive power distribution isolator and 0-20mA signal passive isolator, using complementary symmetry type emitter output circuit and high-frequency transformer to realize capability of transmitting Hart communication digit signals. The invention can be widely applied to industrial automation instruments and systems for realizing automation of information acquisition, transmission, conversionand processing in the production process, the passive isolator is usually added between the field sensor and the control room apparatus in the information acquisition and transmission process to enha nce the stability and reliability of information acquisition. The innovative current mutual inductance, self-oscillation and signal no waste magnetic isolation technique of the invention by improving the circuit and high-frequency transformer, solves the problem of low transmission efficiency due to self variation of signal and load sizes.
Description
Technical field
The present invention relates to the passive isolator that uses in the electric control series of products, a kind of specifically passive power distribution isolator and 0～20mA passive signal isolator.
Background technology
Along with the emerge in multitude of industrial automation product with extensively popularize, electronic equipment, Switching Power Supply, computing machine and Programmable Logic Controller PLC etc., when industrial automation is brought convenience, promptly be the object of noise, be a noise source again; The noise of particularly transition character, its climbing speed are fast, and the duration is short, and voltage amplitude is big; Randomness is strong, and automated system realizes the obtaining of production process information, transmission, transfer process, when signal circuit two ends all during ground connection; Because there is potential difference (PD) in the place, two ends, will form the vagabond current loop, vagabond current is through signal wire resistance; Become interference voltage, metering circuit is caused interference.Therefore in industrial automation control system; Between pulpit, computer house PLC and on-the-spot electronic measuring instrument, sensor according to the different common adjunction passive power distribution isolator and the passive signal isolator of control method; Can filter extraneous interference; Can avoid again sending out noise and string mould, common mode interference all being played inhibiting effect, to improve electronic measuring instrument, sensor, the antijamming capability of PLC and the reliability of system to the external world.
In a word, in passive isolator, all adopt the magnetic isolation mode of electric current mutual inductance at present both at home and abroad, the dc current signal of its transmission, the communication digital signal, antidamping, bringing onto load, signal linear index etc. all receive the very big restriction of employed separation principle.
Show patents such as the enterprise of existing many production passive isolators, and " realizing passive 4～20mA isolator " 200720008536.3 at present from the interrelated data retrieval that comprises Chinese patent with constant current source and high-frequency transformer.And the product that present product mainly is provided with signal, audio frequency etc., it is strong to have a unicity, does not have defectives such as versatility.
Summary of the invention
In order to overcome the deficiency of prior art, the objective of the invention is to provide passive power distribution isolator and the 0～20mA passive signal isolator of realizing transmitting Hart communication digital signal with complementary symmetrical expression emitter output circuit and high-frequency transformer.
The technical solution adopted for the present invention to solve the technical problems is: a kind of passive power distribution isolator and 0～20mA signal passive isolator; It is characterized in that: the circuit of forming by output of complementary symmetrical expression emitter-base bandgap grading and high-frequency transformer: Vi+end with-hold input end to be connected to source device for isolator, Vo+end and-hold output terminal into isolator; One end of resistance R 1 with an end of the collector of triode T1 and capacitor C 3 be connected to Vi+end; One end of the negative terminal of the other end of resistance R 1 and diode D1, capacitor C 1 and the base stage of triode T1 connect; One end of the other end of the negative terminal of the anode of diode D1 and diode D2, capacitor C 1, capacitor C 2 and the end of coil resistance r1 connect; The other end of resistance r1 is connected with an end of inductance L 1; One end of the emitter of the emitter of the other end of inductance L 1 and triode T1, triode T2 and inductance L 2 connects; The other end of inductance L 2 is connected with an end of inductance L 3; One end of the other end of the other end of inductance L 3 and capacitor C 3 and capacitor C 4 connects; The base stage of one end of the anode of diode D2 and resistance R 2, the other end of capacitor C 2 and triode T2 connects; The other end of resistance R 2 with the other end of the collector of triode T2 and capacitor C 4 be connected to Vi-end; The negative terminal of one end of inductance L 4 and the anode of diode D3 and diode D4 connects; One end of the other end of inductance L 4 and capacitor C 5 and an end of capacitor C 6 connect; The negative terminal of diode D3 with an end of the other end of capacitor C 5 and capacitor C 7 be connected to Vo+end; The anode of diode D4 with the other end of the other end of capacitor C 6 and capacitor C 7 be connected to Vo-end.
R1, R2 are the identical resistance of resistance in the described circuit, and D1, D2 are the diode of same model, and T1 is a NPN type triode, and T2 is the positive-negative-positive triode.
C1, C2 are the alternating voltage shunt capacitance in the described circuit; R1, L1, L2 are step-up transformer; R1 is a transformer secondary coil resistance; L1 is a transformer secondary coil inductance, and the induced voltage that the connection between them makes L1 is connected to input end as the input signal of complementary symmetrical expression emitter output circuit through C1, C2.
L2 is a transformer polar curve circle inductance just in the described circuit, very for a short time the ignoring of first polar curve circle resistance, and C3, C4 electric capacity rise and cut off that the direct current conducting exchanges the source of doing and the appearance value equates; The L3 inductance value is greater than L2, and L3, L4 are mutual inductor polar curve circle inductance just for current transformer L3, and L4 is a mutual inductor secondary coil inductance; The load that connects to form complementary symmetrical expression emitter output circuit between them; They and triode T1, T2 connect to form modulation-demodulation circuit, and when circuit was used for Signal Spacing, circuit can be modulated into square wave current signal with dc current signal; When circuit was used for the distribution isolation, circuit can be demodulated to dc current signal with square wave current signal.
D3, D4 are the diode of same model in the described circuit; C5, C6, C7 are electric capacity, connect to form between they and the L4, and also be modulation-demodulation circuit simultaneously; When circuit is used for the distribution isolation; Circuit can be modulated into square wave current signal with dc current signal again, and when circuit was used for Signal Spacing, circuit can be demodulated to dc current signal with square wave current signal.
Its principle of work is to make distribution when circuit to isolate the time spent; Vi connects 24 volts of power supplys of direct current; Because the dividing potential drop effect B point voltage of C3, C4 is 12 volts, and the bias line of setting at this moment triode T1 saturation conduction e point voltage be 24 volts, the T1 collector current flows to the B point through L2, L3 by the e point; Because of the electric current that flows through inductance can not suddenly change; L2 produces induced voltage A point voltage after L1 boosts and is higher than the e point the further saturated T2 of T1 is ended, and raises gradually along with the transient process L1 ends A point voltage of induced voltage reduces the e point voltage gradually, and triode T1 ends when voltage e point is higher than the A point; T2 conducting at this moment e point voltage is 0 volt; The T2 collector current flows to the e point through L3, L2 by the A point, and L2 produces induced voltage e point voltage after L1 boosts and is higher than the A point the further saturated T1 of T2 is ended, along with the transient process L1 ends A point voltage of the induced voltage e point voltage that raises gradually reduces gradually; Triode T2 ends when voltage e point is lower than the A point; Complementary symmetrical expression emitter-base bandgap grading output multivibrator circuit has just been formed in the upset repeatedly of the such T1 of T1 conducting, T2 conducting cut-off state, above-mentioned schematic diagram, and the L3 two ends also just form its frequency of square-wave signal that amplitude is about 24 volts and are about L1, r1 0.7 times the inverse of two transit times.Because L3, L4 are current transformer ratio 1: 1; L4 two ends square-wave signal produces 24 volts of power supplys of direct current of isolation when spot sensor is supplied power after D3, D4, C5, C6 rectification C7 filtering; Sensor generates the 4～20mA Constant Direct Current electric current that changes with the in-site measurement value; 4～20mA Constant Direct Current electric current that square-wave frequency modulation becomes square wave current signal to be demodulated to by L3, T1, T2 to change with the in-site measurement value through the two ends of D4 and L4 is again flowed out by the input negative terminal to be delivered to the pulpit and regulates or control; When the scene is intelligence sensor; The isolator component parameter is selected, and circuit is very little to the Hart 1.2KHz ~ 2KHz numerical frequency signal impedance of communicating by letter, so this circuit can transmit the Hart signal of communication when realizing on-the-spot distribution isolated; And realize the loss of direct supply isolation processes noenergy, so this circuit realizes that Signal Spacing signal transduction process good linearity carrying load ability is strong.Make 0～20mA dc current signal when this circuit and isolate the time spent; Input end inserts current signal; The voltage of signal itself makes the circuit resonance current be modulated into square wave current signal through T1, T2, L3; Be demodulated to flow out through D3 with the corresponding 0～20mA dc current signal of input signal by L4, D3, D4, C5, C6 again and be used for control or regulate, this sample circuit has just been realized the function of passive isolated DC current signal.
Passive power distribution isolator can play by the pulpit active equipment when spot sensor provides the direct supply effect of isolation; 4～20mA the dc current signal with the variation of in-site measurement value that reception is produced by sensor is delivered to the pulpit active equipment and is used for control and adjusting, and can transmit Hart communication digital signal synchronously.Be used as the passive signal isolator time spent, can play 0～20mA dc current signal effect that isolation was controlled or regulated by pulpit active equipment and instrument, instrument being used to of seeing off.
The invention has the beneficial effects as follows: the present invention can be widely applied to the automation equipment that obtains, transmits, changes, handles of industrial automation instrument and system's realization production process information; Obtain in information, sensor and pulpit equipment room add this passive isolator, the reliability and stability that obtains with raising information to transmittance process at the scene usually.The present invention transmits lossless magnetic isolation technology through electric current mutual inductance, self-sustained oscillation, the signal that the improvement of circuit and high-frequency transformer is innovated, and has solved because of signal self variation and the big or small transmission efficiency problem that influences of load.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is an isolation module work synoptic diagram of the present invention.
1 is (resource loop are arranged) such as pulpit instrument or computing machines among Fig. 2, and 2 is the HART digital signal, and 3 is spot sensor.
When expression is isolated among Fig. 2; Module makes complementary symmetrical expression emitter output circuit high-frequency transformer generation multi-harmonic-oscillations frequency 100KHz make isolation module work from there being resource loop to obtain voltage signal; Output provides the power supply of isolation to spot sensor with rectifier system; And 4～20mA signal that receiving sensor produces passes back to the pulpit, and can transmit Hart communication digital signal synchronously.As resource loop is that 0～20mA can improve behind isolation module and anti-interferencely can be used for control or regulate.
Embodiment
Embodiment 1:
See also the circuit that Fig. 1 and Fig. 2 are made up of output of complementary symmetrical expression emitter-base bandgap grading and high-frequency transformer: Vi+end with-hold input end to be connected to source device for isolator, Vo+end and-hold output terminal into isolator; One end of resistance R 1 with an end of the collector of triode T1 and capacitor C 3 be connected to Vi+end; One end of the negative terminal of the other end of resistance R 1 and diode D1, capacitor C 1 and the base stage of triode T1 connect; One end of the other end of the negative terminal of the anode of diode D1 and diode D2, capacitor C 1, capacitor C 2 and the end of coil resistance r1 connect; The other end of resistance r1 is connected with an end of inductance L 1; One end of the emitter of the emitter of the other end of inductance L 1 and triode T1, triode T2 and inductance L 2 connects; The other end of inductance L 2 is connected with an end of inductance L 3; One end of the other end of the other end of inductance L 3 and capacitor C 3 and capacitor C 4 connects; The base stage of one end of the anode of diode D2 and resistance R 2, the other end of capacitor C 2 and triode T2 connects; The other end of resistance R 2 with the other end of the collector of triode T2 and capacitor C 4 be connected to Vi-end; The negative terminal of one end of inductance L 4 and the anode of diode D3 and diode D4 connects; One end of the other end of inductance L 4 and capacitor C 5 and an end of capacitor C 6 connect; The negative terminal of diode D3 with an end of the other end of capacitor C 5 and capacitor C 7 be connected to Vo+end; The anode of diode D4 with the other end of the other end of capacitor C 6 and capacitor C 7 be connected to Vo-end.
The present embodiment isolator can play by the pulpit active equipment when spot sensor provides the direct supply effect of isolation; 4～20mA the dc current signal with the variation of in-site measurement value that reception is produced by sensor is delivered to the pulpit active equipment and is used for control and adjusting, and can transmit Hart communication digital signal synchronously.Be used as the passive signal isolator time spent, can play 0～20mA dc current signal effect that isolation was controlled or regulated by pulpit active equipment and instrument, instrument being used to of seeing off.
Claims (5)
1. passive isolator is characterized in that: the circuit of forming by complementary symmetrical expression emitter-base bandgap grading output and high-frequency transformer: Vi+end and an end are that the input end of isolator is connected to source device, Vo+hold and an end is the output terminal of isolator; One end of resistance R 1 with an end of the collector of triode T1 and capacitor C 3 be connected to Vi+end; One end of the negative terminal of the other end of resistance R 1 and diode D1, capacitor C 1 and the base stage of triode T1 connect; One end of the other end of the negative terminal of the anode of diode D1 and diode D2, capacitor C 1, capacitor C 2 and the end of coil resistance r1 connect; The other end of resistance r1 is connected with an end of inductance L 1; One end of the emitter of the emitter of the other end of inductance L 1 and triode T1, triode T2 and inductance L 2 connects; The other end of inductance L 2 is connected with an end of inductance L 3; One end of the other end of the other end of inductance L 3 and capacitor C 3 and capacitor C 4 connects; The base stage of one end of the anode of diode D2 and resistance R 2, the other end of capacitor C 2 and triode T2 connects; The other end of resistance R 2 is connected to the end of Vi with the other end of the collector of triode T2 and capacitor C 4; Inductance L 3 and inductance L 4 are connected by electromagnetic induction; The negative terminal of one end of inductance L 4 and the anode of diode D3 and diode D4 connects; One end of the other end of inductance L 4 and capacitor C 5 and an end of capacitor C 6 connect; The negative terminal of diode D3 with an end of the other end of capacitor C 5 and capacitor C 7 be connected to Vo+end; The anode of diode D4 is connected to the end of Vo with the other end of the other end of capacitor C 6 and capacitor C 7.
2. a kind of passive isolator according to claim 1 is characterized in that: R1, R2 are the identical resistance of resistance in the described circuit, and D1, D2 are the diode of same model, and T1 is a NPN type triode, and T2 is the positive-negative-positive triode.
3. a kind of passive isolator according to claim 1; It is characterized in that: C1, C2 are the alternating voltage shunt capacitance in the described circuit; R1, L1, L2 are step-up transformer; R1 is a transformer secondary coil resistance, and L1 is a transformer secondary coil inductance, and transformer r1, L1, L2 connection are connected to input end through C1, C2.
4. a kind of passive isolator according to claim 1; It is characterized in that: L2 is a transformer polar curve circle inductance just in the described circuit, and capacitor C 3, C4 appearance value equate that L3 is a mutual inductor polar curve circle inductance just; L4 is a mutual inductor secondary coil inductance, and L3, L4 are connected with triode T1, T2.
5. a kind of passive isolator according to claim 1 is characterized in that: D3, D4 are the diode of same model in the described circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101113716A CN101551415B (en) | 2009-03-30 | 2009-03-30 | Passive power distribution isolator and 0-20mA signal passive isolator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101113716A CN101551415B (en) | 2009-03-30 | 2009-03-30 | Passive power distribution isolator and 0-20mA signal passive isolator |
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| CN101551415A CN101551415A (en) | 2009-10-07 |
| CN101551415B true CN101551415B (en) | 2012-07-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887076B (en) * | 2010-06-22 | 2012-11-21 | 深圳和而泰智能控制股份有限公司 | Circuit and device of isolation sensor |
| CN109709368B (en) * | 2019-01-16 | 2024-03-22 | 中国科学院空间应用工程与技术中心 | Pulse sampling isolation circuit |
| CN109831202A (en) * | 2019-03-07 | 2019-05-31 | 北京中科格励微科技有限公司 | Linear isolator |
| CN112944198A (en) * | 2021-03-20 | 2021-06-11 | 青海西钢自动化信息技术有限公司 | Method and device for detecting inclination direction of floating roof in gas chamber in real time |
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|---|---|---|---|---|
| CN1139213A (en) * | 1995-01-13 | 1997-01-01 | 特克特朗尼克公司 | Split-path linear isolation circuit apparatus and method |
| DE10057315A1 (en) * | 2000-11-17 | 2002-05-29 | Skorp Messtechnik Gmbh | Circuit for floating transfer of measurement signal has transformer with primary winding connected to chopper unit, secondary connected to passive rectifier unit, preferably with two diodes |
| CN2775937Y (en) * | 2005-04-11 | 2006-04-26 | 于广沅 | Two line passive analogue signalisolation amplifier |
| CN201378797Y (en) * | 2009-04-07 | 2010-01-06 | 北京华视通广科技有限公司 | Monitoring device for voltage input and current output |
-
2009
- 2009-03-30 CN CN2009101113716A patent/CN101551415B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139213A (en) * | 1995-01-13 | 1997-01-01 | 特克特朗尼克公司 | Split-path linear isolation circuit apparatus and method |
| DE10057315A1 (en) * | 2000-11-17 | 2002-05-29 | Skorp Messtechnik Gmbh | Circuit for floating transfer of measurement signal has transformer with primary winding connected to chopper unit, secondary connected to passive rectifier unit, preferably with two diodes |
| CN2775937Y (en) * | 2005-04-11 | 2006-04-26 | 于广沅 | Two line passive analogue signalisolation amplifier |
| CN201378797Y (en) * | 2009-04-07 | 2010-01-06 | 北京华视通广科技有限公司 | Monitoring device for voltage input and current output |
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