CN1755743A - Passive electromagnetic isolated signal converter - Google Patents
Passive electromagnetic isolated signal converter Download PDFInfo
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- CN1755743A CN1755743A CN 200510037079 CN200510037079A CN1755743A CN 1755743 A CN1755743 A CN 1755743A CN 200510037079 CN200510037079 CN 200510037079 CN 200510037079 A CN200510037079 A CN 200510037079A CN 1755743 A CN1755743 A CN 1755743A
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Abstract
The invention discloses a massive electromagnetic isolation signal converter, which comprises a push-pull drive circuit, a coupling transformer, a rectification filter circuit, a signal transition processing circuit, a power acquisition circuit and starting circuit parallel with input end of push-pull circuit; the positive and negative ends of input current signal accesses respectively positive end of power acquisition end and negative end of starting and push-pull circuits; arranging two coils to output square wave of opposite phase and provide push-pull signal and synchronous rectification signal in inner transformer in power circuit. This invention can achieve high-standard precision of output signal.
Description
Technical field
The present invention relates to a kind of passive electromagnetic isolated signal converter that is applicable to 4～20mA normalized current Signal Spacing conversion transmission.
Background technology
The existing passive electromagnetic isolated signal converter comprises push-pull driver circuit, coupling transformer, current rectifying and wave filtering circuit and signal processing circuit, and 4 to 20mA constant current source signal is imported from current input terminal; The current signal energy that flows into makes the push-pull driver circuit starting of oscillation and makes push-pull driver circuit work, and current signal is carried out chopping modulation; The current signal energy passes through transformer coupled the secondary of transformer that arrive, and exports from current output terminal after being connected secondary current rectifying and wave filtering circuit and signal transformation processing circuit processes again.There is following defective in this passive electromagnetic isolation signals mapping mode: (1) is not because rectifying and wave-filtering has the power supply power supply, can't realize the active processing of back level signal, when the load variations of signal, amplitude output signal and then changes, and does not accomplish real constant current source signal output; (2) because the operate as normal of push-pull driver circuit is shunted one part of current, and divide the signal that pours off to be compensated in the back level, so non-linearization is serious, precision can't guarantee, can only reach 0.2 class precision usually.
Summary of the invention
The object of the present invention is to provide a kind of passive electromagnetic isolated signal converter, make output signal reach high-level precision, improved the performance of passive electromagnetic isolated signal converter greatly.
Above-mentioned purpose can realize by following technical measures: a kind of passive electromagnetic isolated signal converter comprises push-pull driver circuit, coupling transformer, current rectifying and wave filtering circuit and signal transformation treatment circuit, it is characterized in that also comprising energy harvesting circuit and start-up circuit, start-up circuit is parallel to the input end of push-pull driver circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, and the negative terminal of input current signal inserts the negative terminal of start-up circuit and push-pull driver circuit; The output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, be provided with at the internal transformer of energy harvesting circuit and be used to provide two windings of recommending drive signal and synchronous rectification signal, the opposite square wave of two winding output phases, and insert the signal drive end of push-pull driver circuit and circuit of synchronous rectification accordingly.
Described energy harvesting circuit comprises triode TS1, TS2, transformer T2, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding of transformer T2 separately, the positive input terminal of the centre tap connecting circuit of first grade coupled winding, the centre tap of elementary feedback winding connects the series connection point of resistance R 2 and capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.
Described energy harvesting circuit comprises triode TS1, TS2, transformer T2, transformer T3, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, while triode TS1, the collector of TS2 also connects an anti-phase termination of the first grade coupled winding on the transformer T3 separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding on the transformer T3 separately, transformer T2 goes up the positive input terminal of the centre tap connecting circuit of grade coupled winding just, and transformer T3 goes up the centre tap connection resistance R 2 of elementary feedback winding and the series connection point of capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.
Described start-up circuit is electric capacity, resistance or being formed in parallel by electric capacity, resistance.
In order to make the energy harvesting circuit working stability, shunt regulating circuit between the input end of energy harvesting circuit.Described mu balanced circuit is voltage stabilizing diode, divider resistance or dividing potential drop electric capacity.
The present invention can also be achieved through the following technical solutions: a kind of passive electromagnetic isolated signal converter comprises linear optical coupling, current rectifying and wave filtering circuit and signal transformation treatment circuit, it is characterized in that also comprising energy harvesting circuit, mu balanced circuit and signal sampling amplifying circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, and the negative terminal of input current signal inserts the signal sampling amplifying circuit; Mu balanced circuit is connected between the positive-negative input end of energy harvesting circuit, the voltage that mu balanced circuit forms inserts the power end of signal sampling and amplifying circuit and linear optical coupling, the input that the output of signal sampling amplifying circuit connects linear optical coupling drives linear optical coupling, the output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, and the output of linear optical coupling inserts the signal transformation treatment circuit.
The present invention compared with prior art has the following advantages:
(1) by connecting energy harvesting circuit, can import loop from current signal and obtain that energy is supplied with circuit of synchronous rectification and these secondary treatment circuit are handled in signal transformation, the signal that has solved the signal converter of traditional passive electromagnetic isolation transmits secondary powerup issue; Make passive signal transducer output signal reach high-level precision, the linearity and temperature drift; Improved the performance of passive electromagnetic isolated signal converter greatly.
(2) increase coil winding at the internal transformer of energy harvesting circuit, for push-pull driver circuit and circuit of synchronous rectification provide drive signal, making only needs to increase the chopping modulation frequency signal problem that simple coil winding has solved electric current.Simultaneously modulating frequency can be brought up to a high standard, improve the response speed of system greatly.
(3) input end at push-pull driver circuit connects start-up circuit, makes the preceding energy harvesting circuit input end of push-pull driver circuit operate as normal constitute the loop.The start-up circuit terminal voltage drops to automatically near zero volt after the push-pull driver circuit operate as normal simultaneously, makes start-up circuit only cause minimum shunting, can not influence system accuracy.
Description of drawings
Fig. 1 is the theory diagram of the specific embodiment of the invention one;
Fig. 2 is the circuit theory diagrams of specific embodiment shown in Figure 1;
Fig. 3 is the theory diagram of the specific embodiment of the invention two;
Fig. 4 is the circuit theory diagrams of specific embodiment shown in Figure 3;
Fig. 5 is the another embodiment circuit theory diagrams of energy harvesting circuit among the present invention.
Embodiment
As shown in Figure 1 and Figure 2, present embodiment one comprises push-pull driver circuit, coupling transformer T1, current rectifying and wave filtering circuit and signal transformation treatment circuit, energy harvesting circuit and start-up circuit, start-up circuit is formed in parallel by capacitor C 1, resistance R 1, start-up circuit is parallel to the input end of push-pull driver circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, in order to make the energy harvesting circuit working stability, parallel voltage-stabilizing diode V between the input end of energy harvesting circuit
Z, voltage stabilizing diode V
zAnode connect start-up circuit, negative electrode connects the anode of input current signal.The negative terminal of input current signal inserts the negative terminal of start-up circuit and push-pull driver circuit.The output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, be provided with at the internal transformer of energy harvesting circuit and be used to provide two windings of recommending drive signal and synchronous rectification signal, the opposite square wave of two winding output phases, and insert the signal drive end of push-pull driver circuit and circuit of synchronous rectification accordingly.
Energy harvesting circuit comprises triode TS1, TS2, transformer T2, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding of transformer T2 separately, the positive input terminal of the centre tap connecting circuit of first grade coupled winding, the centre tap of elementary feedback winding connects the series connection point of resistance R 2 and capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.One of them first conducting of powered on moment triode TS1 or TS2 causes transformer T2 flux change, feeds back the conducting electric current that winding 13,14,15 is strengthened triode this moment.The collector electrode current of the triode of conducting increases.After the electric current of the triode of conducting reached capacity, the magnetic flux of transformer T2 no longer increased, and caused the anti-phase variation of feedback winding voltage, turn-on transistor is turn-offed and opens the triode that does not have conducting originally, caused vibration.Electric current is with the oscillation frequency first grade coupled winding that 1,2,3 pin among the transformer T2 constitute of flowing through, and energy is coupled to secondary that 4,5,6 pin among the transformer T2 constitute, and exports after rectifying block D1 commutation capacitor C3 filtering again.
The current signal of 4 end inputs to the constant current source signals of 20mA from Iin+ insert moment from Iin+end flows into, the mu balanced circuit that the stabilivolt VZ that flows through constitutes, the start-up circuit that resistance R 1 and capacitor C 1 constitute flows back to the Iin-end and forms the loop.Then stabilivolt VZ end forms voltage and gives resistance R 2, capacitor C 2, triode TS1, TS2, transformer T2, rectifying block D1, the energy harvesting circuit power supply that filter capacitor C3 constitutes, energy harvesting circuit operate as normal.The opposite drive signal of elementary winding 7,8,9 end output phases at transformer T2 makes field effect transistor MT1 then, the push-pull driver circuit work that MT2 forms.As field effect pipe MT1, after MT2 entered and recommends driving normally, current signal overwhelming majority energy flowed into from 2 ends of the elementary winding of transformer T1, and elementary winding 1 of transformer T1 and 3 ends flow out gets back to the Iin-end.The start-up circuit both end voltage of capacitor C 1 formation of resistance R 1 can not cause big shunting to Iin near zero volt at this moment, does not influence the precision that transformer T1 energy is coupled.Energy harvesting circuit is obtained energy after the D1 rectification outputs to the signal transformation treatment circuit after the C3 filtering from current signal, is reached for the purpose of late-class circuit power supply.And signal energy through transformer T1 be coupled to secondary after by field effect transistor MT3, send into output current or voltage signal after the signal transformation processing circuit processes after the MT4 synchronous rectification.
Above-mentioned start-up circuit is electricity consumption resistance perhaps separately also, also can play the effect of startup; Also available resistance of voltage stabilizing diode or electric capacity substitute, and also can play the effect of voltage stabilizing.
As shown in Figure 3, Figure 4, present embodiment two comprises linear optical coupling, current rectifying and wave filtering circuit and signal transformation treatment circuit, it is characterized in that also comprising energy harvesting circuit, mu balanced circuit and signal sampling amplifying circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, and the negative terminal of input current signal inserts the signal sampling amplifying circuit; Mu balanced circuit is connected between the positive-negative input end of energy harvesting circuit, the voltage that mu balanced circuit forms inserts the power end of signal sampling and amplifying circuit and linear optical coupling, the input that the output of signal sampling amplifying circuit connects linear optical coupling drives linear optical coupling, the output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, and the output of linear optical coupling inserts the signal transformation treatment circuit.
Above-mentioned energy harvesting circuit is identical with embodiment one.Different is to be not activated circuit, and also not needing increases coil winding at the energy harvesting circuit internal transformer, and the signal coupling transformer replaces with linear optical coupling, and sampling resistor is not too big, less than 100 ohm just.The voltage that mu balanced circuit forms is directly to signal sampling and amplifying circuit and linear optical coupling IC power supply.Current signal Iin flow through signal sampling and amplifying circuit obtain a voltage or a current signal with the linear ratio of Iin, send into linear optical coupling IC then and drive linear optical coupling work.Coupling by light after the signal that the receiving end of linear optical coupling obtained and imported the linear ratio of electric Iin is sent into the signal transformation processor again from linear optical coupling output by electric current or voltage signal behind the signal transformation processor output isolated variable.
Flow through stabilivolt and sampling resistor R1 of electric current forms the loop as shown in Figure 4, forms voltage at stabilivolt VZ two ends and gives energy harvesting circuit and operational amplifier U1 power supply.The current signal sampling resistor R1 that flows through obtains the electric signal that is directly proportional with signal Iin, sends into the interior light emitting diodes that operational amplifier U1 amplifies rear drive linear optical coupling U2, and then the luminous intensity of light emitting diode is directly proportional with input signal.For making drive signal stable as early as possible, the end of oppisite phase that 3,4 pin of linear optical coupling U2 insert operational amplifier U1 forms negative feedback simultaneously, and resistance R 3 is negative feedback resistors, and capacitor C 4 is negative anti-meal electric capacity, increases signal stabilization.The inner receiving tube of linear optical coupling is subjected to the irradiation of interior light emitting diodes, light signal is become send the curtage signal that is directly proportional with Iin after electric signal passes out to the signal transformation processing circuit processes by 5,6 pin of linear optical coupling U2.
As shown in Figure 5, energy harvesting circuit can adopt another kind of mode in the foregoing description, comprise triode TS1, TS2, transformer T2, transformer T3, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, while triode TS1, the collector of TS2 also connects an anti-phase termination of the first grade coupled winding on the transformer T3 separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding on the transformer T3 separately, transformer T2 goes up the positive input terminal of the centre tap connecting circuit of grade coupled winding just, and transformer T3 goes up the centre tap connection resistance R 2 of elementary feedback winding and the series connection point of capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.
One of them first conducting of powered on moment triode TS1 or TS2 causes transformer T3 flux change.Two of another winding that 16,17 pin of transformer T3 constitute terminates to 1,3 pin of T2.This moment, the effect by the feedback winding that 13,14,15 pin of transformer T3 constitute was a conducting electric current of strengthening triode.The collector electrode current of the triode of conducting increases.After the electric current of turn-on transistor reached capacity, the magnetic flux of transformer T3 no longer increased, and caused feedback winding voltage anti-phase variation, turn-on transistor is turn-offed and opens the triode that does not have conducting originally, caused vibration.Electric current is with the oscillation frequency winding that 1,2,3 pin of transformer T2 constitute of flowing through, and energy is coupled to secondary that 4,5,6 pin of transformer T2 constitute, and exports after rectifying block D1 commutation capacitor C3 filtering again.This energy acquisition cuicuit separates signal and main energy transformer T2 the saturation transformer of transformer T3 as triode TS1, TS2 feedback signal.That is to say that main energy transformer T2 does not need to reach the saturated energy of just realizing of magnetic core and is coupled, greatly reduce the thermal losses of transformer.By adjusting the turn ratio of transformer T3, be easy to realize the adjustment of oscillation frequency in addition, can promote oscillation frequency significantly under the little situation guaranteeing that transformer generates heat.The lifting significantly of oscillation frequency has two benefits; One only needs less coil turn just can realize more powerful transmission on the transformer T2 magnetic core; Its two, can increase substantially the chopping frequency of transformer T1 signal coupling transformer, improve signal response speed greatly.
Claims (6)
1, a kind of passive electromagnetic isolated signal converter, comprise push-pull driver circuit, coupling transformer, current rectifying and wave filtering circuit and signal transformation treatment circuit, it is characterized in that also comprising energy harvesting circuit and start-up circuit, start-up circuit is parallel to the input end of push-pull driver circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, and the negative terminal of input current signal inserts the negative terminal of start-up circuit and push-pull driver circuit; The output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, be provided with at the internal transformer of energy harvesting circuit and be used to provide two windings of recommending drive signal and synchronous rectification signal, the opposite square wave of two winding output phases, and insert the signal drive end of push-pull driver circuit and circuit of synchronous rectification accordingly.
2, passive electromagnetic isolated signal converter according to claim 1, it is characterized in that described energy harvesting circuit comprises triode TS1, TS2, transformer T2, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding of transformer T2 separately, the positive input terminal of the centre tap connecting circuit of first grade coupled winding, the centre tap of elementary feedback winding connects the series connection point of resistance R 2 and capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.
3, passive electromagnetic isolated signal converter according to claim 1, it is characterized in that described energy harvesting circuit comprises triode TS1, TS2, transformer T2, transformer T3, rectifying block D1, resistance R 2 and capacitor C 2, after being in series, resistance R 2 and capacitor C 2 be connected between the energy harvesting circuit input end, triode TS1, the emitter of TS2 links to each other and the place in circuit negative input end, triode TS1, the collector of TS2 connects a transformer T2 termination of grade coupled winding just separately, while triode TS1, the collector of TS2 also connects an anti-phase termination of the first grade coupled winding on the transformer T3 separately, triode TS1, the base stage of TS2 connects a termination of the elementary feedback winding on the transformer T3 separately, transformer T2 goes up the positive input terminal of the centre tap connecting circuit of grade coupled winding just, and transformer T3 goes up the centre tap connection resistance R 2 of elementary feedback winding and the series connection point of capacitor C 2; The secondary winding termination of transformer T2 connects rectifying block D1.
4, passive electromagnetic isolated signal converter according to claim 1 is characterized in that described start-up circuit is electric capacity, resistance or being formed in parallel by electric capacity, resistance.
5, according to claim 1,2 or 3 described passive electromagnetic isolated signal converters, it is characterized in that shunt regulating circuit between the input end of described energy harvesting circuit, this mu balanced circuit is voltage stabilizing diode, divider resistance or dividing potential drop electric capacity.
6, a kind of passive electromagnetic isolated signal converter, comprise linear optical coupling, current rectifying and wave filtering circuit and signal transformation treatment circuit, it is characterized in that also comprising energy harvesting circuit, mu balanced circuit and signal sampling amplifying circuit, the anode of input current signal inserts the positive input terminal of energy harvesting circuit, and the negative terminal of input current signal inserts the signal sampling amplifying circuit; Mu balanced circuit is connected between the positive-negative input end of energy harvesting circuit, the voltage that mu balanced circuit forms inserts the power end of signal sampling and amplifying circuit and linear optical coupling, the input that the output of signal sampling amplifying circuit connects linear optical coupling drives linear optical coupling, the output terminal of energy harvesting circuit inserts the power supply side of signal processing circuit, and the output of linear optical coupling inserts the signal transformation treatment circuit.
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| CNB2005100370796A CN100346363C (en) | 2005-09-08 | 2005-09-08 | Passive electromagnetic isolated signal converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175903A (en) * | 2011-02-23 | 2011-09-07 | 湘潭电机股份有限公司 | Passive isolated direct current (DC) voltage detection device for urban railway vehicle |
| CN102944719A (en) * | 2012-11-16 | 2013-02-27 | 大连丰和日丽电气有限公司 | Passive direct-current voltage transducer |
| CN107508381A (en) * | 2017-09-25 | 2017-12-22 | 贵州电网有限责任公司电力科学研究院 | One kind is used for active power distribution network intelligent terminal battery isolation monitoring device |
| CN109995243A (en) * | 2019-04-23 | 2019-07-09 | 中国电子科技集团公司第四十三研究所 | A kind of magnetic isolation feedback circuit |
| CN112688564A (en) * | 2019-10-17 | 2021-04-20 | 上海辰竹仪表有限公司 | Isolation transmission circuit of transformer based on center tap removal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO980416A1 (en) * | 1998-05-15 | 1999-11-15 | Sgs Thomson Microelectronics | CIRCUIT FOR TRACKING AND MAINTAINING THE VALUE OF A WAVEFORM |
| US6272025B1 (en) * | 1999-10-01 | 2001-08-07 | Online Power Supply, Inc. | Individual for distributed non-saturated magnetic element(s) (referenced herein as NSME) power converters |
| CN1502996A (en) * | 2002-11-20 | 2004-06-09 | 伟 吴 | Detection isolation and transmission device for voltage and current signal |
| CN2694618Y (en) * | 2004-04-30 | 2005-04-20 | 张万江 | Photoelectric isolation active constant current signal converter |
-
2005
- 2005-09-08 CN CNB2005100370796A patent/CN100346363C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175903A (en) * | 2011-02-23 | 2011-09-07 | 湘潭电机股份有限公司 | Passive isolated direct current (DC) voltage detection device for urban railway vehicle |
| CN102175903B (en) * | 2011-02-23 | 2013-06-19 | 湘潭电机股份有限公司 | Passive isolated direct current (DC) voltage detection device for urban railway vehicle |
| CN102944719A (en) * | 2012-11-16 | 2013-02-27 | 大连丰和日丽电气有限公司 | Passive direct-current voltage transducer |
| CN107508381A (en) * | 2017-09-25 | 2017-12-22 | 贵州电网有限责任公司电力科学研究院 | One kind is used for active power distribution network intelligent terminal battery isolation monitoring device |
| CN109995243A (en) * | 2019-04-23 | 2019-07-09 | 中国电子科技集团公司第四十三研究所 | A kind of magnetic isolation feedback circuit |
| CN112688564A (en) * | 2019-10-17 | 2021-04-20 | 上海辰竹仪表有限公司 | Isolation transmission circuit of transformer based on center tap removal |
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| CN100346363C (en) | 2007-10-31 |
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Owner name: ZHANG JIAORU Free format text: FORMER OWNER: GUANGZHOU HIGHWAY ELECTRONICS CO., LTD. Effective date: 20081024 |
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Effective date of registration: 20081024 Address after: Floor 6, building 2, Huang Zhou Industrial Zone, Che Po Road, Guangzhou, Guangdong, Tianhe District Patentee after: Zhang Jiaoru Address before: Room 504, block B, Huajing garden, Tianhe Software Park, No. 89 Zhongshan Road, Tianhe District, Guangdong, Guangzhou, China Patentee before: Guangzhou Highway Electronics Co., Ltd. |