CN205353179U - Nonlinearity current sampling subassembly - Google Patents
Nonlinearity current sampling subassembly Download PDFInfo
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- CN205353179U CN205353179U CN201620085739.1U CN201620085739U CN205353179U CN 205353179 U CN205353179 U CN 205353179U CN 201620085739 U CN201620085739 U CN 201620085739U CN 205353179 U CN205353179 U CN 205353179U
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Abstract
The utility model provides a nonlinearity current sampling subassembly, includes non -linear subassembly (1), compensation component (2), voltage/current signal processing circuit unit (3). Nonlinearity subassembly (1) forms electric parallel connection with compensation component (2) to both ends behind the antithetical couplet form electrical connection with voltage/current signal processing circuit unit (3). This subassembly mainly used satisfies some special application's needs, resolution ratio and anti -interference ability in the time of can enough improving instantaneous undercurrent signal, and the voltage drop in the time of guaranteeing the heavy current signal again on the sample subassembly is lower, the power consumption of sample subassembly when effectively reducing the heavy current to sampling signal's time delay is little.
Description
Technical field
The present invention relates to a kind of current sampling assembly, particularly a kind of non-linear current sampling assemble controlled for thyristor switch, belongs to Power Electronic Circuit technical field.
Background technology
IGCT has advantage in the application of high-voltage large current, but, it bears the poor ability of overvoltage, overcurrent, and the thermal capacity of IGCT is only small, once there is overcurrent, temperature steeply rises, it is likely to burn out PN junction, causes element internal short circuit or open circuit.Such as, when the IGCT overcurrent of one 100 peace is 400A, only allows to continue 0.02 second, otherwise will damage because of overheated；The ability extreme difference of IGCT tolerance overvoltage, when voltage exceedes its breakdown reverse voltage, even if the time is extremely short, is also easily damaged.If forward voltage exceedes break over voltage, then IGCT misleads, and the electric current after conducting is relatively big, makes device impaired.
IGCT belongs to half control type device, and its gate signal can control the conducting of element, but can not control it and turn off, although the gate signal of GTO can control the conducting of device, can control again it and turn off, but its control circuit is complicated, can reduce the reliability of system equally.For common IGCT, after triggering and conducting, it is necessary to naturally turn off until flowing through the current over-zero of IGCT, therefore, in order to efficiently control IGCT, it is necessary for measuring the electric current flowing through IGCT accurately.For contactless electromagnetic voltage adjusting system, only it is accurately detected the current zero signal of IGCT for switching transformer winding, provides the triggering signal of IGCT, the high-performance of guarantee system dynamics pressure regulation and high reliability exactly.Only carry out non-linear sampling to by the electric current of transformator associated winding, both resolution during instantaneous small area analysis signal had been improved, the voltage drop ensured again during big current signal on sampling element is relatively low, and reaching sufficiently small signal lag, guarantee system in broad current range possesses excellent performance.
But, at present the element of current sampling is substantially shunt resistance, current transformer or Hall element, it is all that electric current is linearly sampled, when small-signal, resolution is low, it is difficult to meet the needs of some special applications, and make Current Transformer that electric current to be sampled, there is bigger phase shift, therefore can not detect current zero exactly.
At present, also there are some patented technologies for current sampling, such as the patent CN201010133923.6 current sampling circuit provided, it is that sample circuit is connected in parallel on resonant capacitance, capacitance ratio by shunting capacitance with main circuit electric capacity determines the electric current relations of distribution, advantage is electric current only only small in current sampling circuit, the power attenuation of current sampling circuit can be substantially reduced, and small-sized transformer can be selected to realize the inspection stream of high-current circuit, to reduce cost and volume, but this is only applicable to the current sampling of resonant zero on-off circuit, it is not suitable for the current sampling of IGCT.And for example patent CN200810018517.8, CN201110268069.9, although there being some advantages, but still it is based on Hall element or the principle of resistive linearity sampling, thus resolution when can not improve small area analysis signal, it is difficult to meet the needs of some particular application.
Summary of the invention
It is an object of the invention to propose a kind of non-linear current sampling assemble, resolution during instantaneous small area analysis signal can either be improved, the voltage drop ensured again during big current signal on sampling assemble is relatively low, effectively reduces the power attenuation of sampling assemble during big electric current, and the time delay of sampled signal is little.Present invention is mainly used for meeting the needs of some special applications, rather than in order to accurately measure the size of electric current.
The present invention is achieved in that a kind of non-linear current sampling assemble, it is characterised in that including: non-linear component (1), compensating element, (2), current signal processing unit (3).Wherein:
Non-linear component (1) is formed with compensating element, (2) and is electrically connected in parallel, and the two ends after parallel connection form electrical connection with current signal processing unit (3)；
Non-linear component (1) and compensating element, (2) are formed after being electrically connected in parallel, and access in sampled current branch (4) electrically connecting.
Described non-linear component (1) is made up of the two of reverse parallel connection groups of PNP type triode V21, V22；The base stage of audion V21 is connected with the emitter stage of colelctor electrode and audion V22；The base stage of audion V22 is connected with the emitter stage of colelctor electrode and audion V21, forms audion V21 and V22 and is connected in antiparallel, then is connected in parallel with linear resistance R21.
The present invention uses above-mentioned critical piece to constitute according to above-mentioned design.Its operation principle is: when sampled electric current is by non-linear component (1), form voltage signal on non-linear component (1), is taken out by this voltage signal and gives current signal processing unit (3).Owing to current sampling is to take out according to the nonlinear electrical characteristic of non-linear component (1), therefore both can accomplish there is sufficiently high resolution when instantaneous small area analysis signal, the voltage drop that can guarantee that again during big current signal on sampling element is relatively low, thus effectively reducing the power attenuation of sampling assemble during big electric current, and owing to the electric capacity of non-linear component self is only small, thus the time delay of the signal of sampling current is very little.In order to make sampled signal have the good electrical characteristic of concordance when small area analysis signal, at two ends shunt compensation element (2) of non-linear component (1), and compensating element, (2) is generally made up of linear element.
Advantages of the present invention and effect:
(1) resolution during instantaneous small area analysis signal can be improved；
(2) when big current signal, the voltage drop on sampling assemble is relatively low, can effectively reduce the power attenuation of sampling assemble during big electric current；
(3) interference free performance during Weak current signal can be improved；
(4) time delay of current sampling signal is little.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the circuit block diagram of the present invention.
Fig. 2 is the current sampling characteristic curve of the present invention.
Fig. 3 is the non-linear current sampling assemble schematic diagram being made up of PNP type triode.
Fig. 4 is the non-linear current sampling assemble schematic diagram being made up of NPN type triode.
Fig. 5 is the non-linear current sampling assemble schematic diagram being made up of diode.
Fig. 6 is the electronic switch control circuit functional-block diagram using non-linear current sampling assemble.
Fig. 7 is the electric main circuit diagram of the AC voltage adjusting lighting energy saving power supply for high-intensity gas discharge lamp.
Detailed description of the invention
Refer to Fig. 1, non-linear component (1) is formed with compensating element, (2) and is electrically connected in parallel, and the two ends after parallel connection form electrical connection with current signal processing unit (3)；Non-linear component (1) and compensating element, (2) are formed after being electrically connected in parallel, and access in sampled current branch (4) electrically connecting.When sampled electric current is by non-linear component (1), non-linear component (1) forms voltage signal, this voltage signal is taken out and gives current signal processing unit (3).Owing to current sampling is to take out according to the nonlinear electrical characteristic of non-linear component (1), therefore both can accomplish there is sufficiently high resolution when instantaneous small area analysis signal, the voltage drop that can guarantee that again during big current signal on sampling element is relatively low, thus effectively reducing the power attenuation of sampling assemble during big electric current, and owing to the electric capacity of non-linear component self is only small, thus the time delay of the signal of sampling current is very little.In order to make sampled signal have the good electrical characteristic of concordance when small area analysis signal, at two ends shunt compensation element (2) of non-linear component (1), and compensating element, (2) is generally made up of linear element.
Refer to Fig. 2, voltage response when this is sampling current I by non-linear component, when sampling current I is less than or equal to Icr, the output voltage V of sampling assemble is directly proportional to electric current, and slope size is determined by the linear resistance of compensating element,；When electric current is more than Icr, the output voltage of sampling assemble and electric current press logarithmic parabola change, thus the output voltage of sampling assemble is significantly reduced when big current sampling, also just reducing the power attenuation of sampling assemble during big electric current, output voltage when electric current is more than Icr is mainly determined by the characteristic of non-linear component.
According to required nonlinear characteristic, it is possible to use different nonlinear devices realizes non-linear component (1), the following is several embodiment.
Embodiment 1:
Refer to Fig. 3, be made up of non-linear current sampling assemble PNP type triode.During sampling non-linear for alternating current, non-linear component (1) is made up of the two of reverse parallel connection groups of PNP type triode V21, V22, often organizes the quantity of PNP type triode relevant with the load current value of the maximum of branch current and every PNP type triode.When sampled branch current is less, V21, V22 all can be made up of 1 PNP type triode, and when sampled branch current is bigger, V21, V22 all need to use many PNP type triode parallel connections, the base stage of every PNP type triode and colelctor electrode link together.When sampling non-linear for DC current, non-linear component (1) has only to 1 group of PNP type triode V21 or V22 and constitutes, and the principle now using PNP type triode is that branch current direction flows to colelctor electrode from the emitter stage of PNP type triode.Compensating element, (2) uses 1 linear resistance R21, is connected in parallel on the two ends of non-linear component (1), and the voltage signal thus taken out gives current signal processing unit (3).
The base stage of audion V21 is connected with the emitter stage of colelctor electrode and audion V22；The base stage of audion V22 is connected with the emitter stage of colelctor electrode and audion V21, forms audion V21 and V22 and is connected in antiparallel, then is connected in parallel with linear resistance R21.Under this connected mode, audion V21 and V22 is operated in critical saturation, through coordinating with linear resistance R21, resolution during instantaneous small area analysis signal can be improved, interference free performance during Weak current signal can be improved again, can also effectively reduce the voltage drop on audion V21 and V22 of the alternating current big current signal of positive and negative half-wave, effectively reduce the power attenuation of sampling assemble during big electric current.
Embodiment 2:
Refer to Fig. 4, be made up of non-linear current sampling assemble NPN type triode.During sampling non-linear for alternating current, non-linear component (1) is made up of the two of reverse parallel connection groups of NPN type triode V31, V32, often organizes the quantity of NPN type triode relevant with the load current value of the maximum of branch current and every NPN type triode.When sampled branch current is less, V31, V32 all can be made up of 1 NPN type triode, and when sampled branch current is bigger, V31, V32 all need to use many NPN type triode parallel connections, the base stage of every NPN type triode and colelctor electrode link together.When sampling non-linear for DC current, non-linear component (1) has only to 1 group of NPN type triode V31 or V32 and constitutes, and the principle now using NPN type triode is that branch current direction flows to emitter stage from the colelctor electrode of NPN type triode.Compensating element, (2) uses 1 linear resistance R31, is connected in parallel on the two ends of non-linear component (1), and the voltage signal thus taken out gives current signal processing unit (3).
The base stage of audion V31 is connected with the emitter stage of colelctor electrode and audion V32；The base stage of audion V32 is connected with the emitter stage of colelctor electrode and audion V31, forms audion V31 and V32 and is connected in antiparallel, then is connected in parallel with linear resistance R21.Under this connected mode, audion V31 and V32 is operated in critical saturation, through coordinating with linear resistance R31, resolution during instantaneous small area analysis signal can be improved, interference free performance during Weak current signal can be improved again, can also effectively reduce the voltage drop on audion V31 and V32 of the alternating current big current signal of positive and negative half-wave, effectively reduce the power attenuation of sampling assemble during big electric current.
Embodiment 3:
Refer to Fig. 5, be made up of non-linear current sampling assemble diode.During sampling non-linear for alternating current, non-linear component (1) is made up of the two of reverse parallel connection groups of diodes D1, D2, often organize the quantity of diode relevant with the load current value of the maximum of branch current and every diode, when sampled branch current is less, D1, D2 all can be made up of 1 diode, and when sampled branch current is bigger, D1, D2 all need to use many diodes in parallel in the same direction.When sampling non-linear for DC current, non-linear component (1) has only to 1 group of diode D1 or D2 and constitutes, and now uses one group of diode that sense of current during diode current flow is consistent with branch current direction.Compensating element, (2) uses 1 linear resistance R1, is connected in parallel on the two ends of non-linear component (1), and the voltage signal thus taken out gives current signal processing unit (3).
Embodiment 4:
Refer to Fig. 6, be the electronic switch control circuit functional-block diagram using non-linear current sampling assemble, in the contactless electromagnetic voltage adjusting product of transformator.Non-linear component (1) is formed with compensating element, (2) and is electrically connected in parallel, and the two ends after parallel connection form electrical connection with current signal processing unit (3)；Non-linear component (1) and compensating element, (2) are formed after being electrically connected in parallel, and access in sampled current branch (4) electrically connecting；Control circuit (5) constitutes electrical connection with current signal processing unit (3) and electrical switch (6)；Electrical switch (6) series connection being made up of one group of bidirectional thyristor accesses in sampled current branch (4).When sampled electric current is by non-linear component (1), non-linear component (1) forms voltage signal, this voltage signal is taken out and gives current signal processing unit (3).Owing to current sampling is to take out according to the nonlinear electrical characteristic of non-linear component (1), therefore both can accomplish there is sufficiently high resolution when instantaneous small area analysis signal, the voltage drop that can guarantee that again during big current signal on sampling element is relatively low, thus effectively reducing the power attenuation of sampling assemble during big electric current, and owing to the electric capacity of non-linear component self is only small, thus the time delay of the signal of sampling current is very little.In order to make sampled signal have the good electrical characteristic of concordance when small area analysis signal, at two ends shunt compensation element (2) of non-linear component (1), and compensating element, (2) is made up of linear resistive element.Signal after current signal processing unit (3) is nursed one's health sends into control circuit (5), control circuit (5) send control signal according to the condition set, and controls to trigger and connects relevant electrical switch (6).Owing to employing non-linear current sampling assemble in circuit, resolution during instantaneous small area analysis signal can be improved, interference free performance during Weak current signal can be improved again, can also effectively reduce the power attenuation of sampling assemble, the more important thing is that the sampled signal that this assembly provides can make control circuit accurately control the switching of IGCT when current zero, improve the Performance And Reliability of the contactless electromagnetic voltage adjusting product of transformator.
Please referring further to Fig. 7, this is the electric main circuit diagram of the AC voltage adjusting lighting energy saving power supply for high-intensity gas discharge lamp.M1 is intelligent control module (model is MCT801E)；M2 is isolation and the driver element of IGBT group signal；Resistance R3, R4 and audion V5 composition bypass drive circuit, control the action of auxiliary reclay KJ1, and its contact KJ1-1 controls bypass contactor KM1；Permutator S1 is used for controlling manual bypass and work automatically；Transformator T1 has multiple tap, is connected to the bidirectional thyristor V1 as switching device～V4 pressure regulation unit constituted respectively through fastp-acting fuse；Fastp-acting fuse F1～F4 plays the effect quickly protecting bidirectional thyristor；ZJ1 is non-linear current sampling assemble, and the electric current flowing through IGCT also flows through ZJ1, and the sampled signal that this assembly provides can make intelligent control module accurately control the switching of IGCT when current zero, improves the Performance And Reliability of transformator No-contact switch；The normally opened contact KM1-2 and normally-closed contact KM1-1 of KM1 constitutes electrical interlocks；Lin is the phase line of exchange input, and Lout is the phase line exchanging output, and exchange input is N with the common port exported；The auxiliary normally-closed contact KM1-4 of catalyst KM1, resistance R5, light emitting diode D2 constitute bypass instruction.
Operation principle is: by the manually controllable power work of permutator S1 in auto state or bypass condition, when permutator S1 connects A contact, work in auto state, be now added to the armature winding (high voltage winding) of transformator T1 from the alternating voltage of Lin input by permutator S1；When permutator S1 connects B contact, working in bypass condition, permutator S1 is by the armature winding short circuit of transformator T1, thus the output voltage of transformer secondary output winding is zero, and ac output voltage is equal to AC-input voltage, completes manual bypass function.
When permutator S1 is placed in automatic mode: when the PL pin of intelligent control module M1 exports high level signal, by resistance R3, R4 provides bias voltage to audion V5 base stage, audion V5 saturation conduction, relay K J1 coil energized action, catalyst KM1 coil obtains voltage operation, bypass contact KM1-1 disconnects, the each tap of armature winding of transformator T1 is controlled by bidirectional thyristor V1～V4, by the bidirectional thyristor wherein turned on, corresponding for transformator tap is connected to the normally opened contact KM1-2 of electrical interlocks, owing to now normally opened contact KM1-2 is in closure state, therefore the armature winding of transformator T1 has been received exchange input Lin and has exchanged common port N, the voltage of transformer secondary output winding is equal to armature winding institute making alive divided by no-load voltage ratio, ac output voltage subtracts the voltage of transformer secondary output winding equal to AC-input voltage, the tap joint position that no-load voltage ratio is connected with IGCT is relevant, then, ac output voltage obtains adjustment, the power consumption of high-intensity gas discharge lamp is relevant to added voltage, the thus brightness of adjustable high-intensity gas discharge lamp and fractional energy savings.M2 is the triggering signal driving unit of bidirectional thyristor V1～V4, and it receives from the control signal controlling module M1, realizes electrical isolation by the optocoupler in M2, triggers corresponding IGCT then through the drive circuit in M2.The electric current flowing through bidirectional thyristor V1～V4 IGCT also flows through non-linear current sampling assemble ZJ1, this assembly can improve resolution during instantaneous small area analysis signal, interference free performance during Weak current signal can be improved again, can also effectively reduce the power attenuation of sampling assemble, the sampled signal that ZJ1 provides can make intelligent control module accurately control the switching of IGCT when current zero, improves the Performance And Reliability of Transformer Winding No-contact switch.
When controlling module M1 output low level signal, audion V5 ends without bias voltage because of base stage, relay K J1 is failure to actuate, catalyst KM1 coil is in reset state because of no-voltage, bypass contact KM1-1 Guan Bi, by the short circuit of the armature winding of transformator T1, thus the output voltage of transformer secondary output winding is zero, ac output voltage is equal to AC-input voltage, completes auto by pass function.Meanwhile, the normally opened contact KM1-2 of electrical interlocks disconnects, it is achieved electrical interlocks.The normally-closed contact KM1-4 Guan Bi of catalyst KM1, power supply [1] the DC voltage VCC provided is added on light emitting diode D2 by contact KM1-4, resistance R5, and D2 is luminous, and instruction is in auto by pass state.
Additionally, the normally opened contact KM1-3 of catalyst KM1 is for controlling module M1 offer bypass condition signal.
Owing to the present invention carries out Bypass Control at the high-voltage side of transformator, thus it is less to control electric current, the capacity of required electrical equipment is little, with switching compared with bypass at major loop of prior art, the volume of required bypass electrical equipment is little, cost is low, reliability is high, and easily controllable.
Claims (2)
1. a non-linear current sampling assemble, it is characterised in that including: non-linear component (1), compensating element, (2), current signal processing unit (3)；Wherein:
Non-linear component (1) is formed with compensating element, (2) and is electrically connected in parallel, and the two ends after parallel connection form electrical connection with current signal processing unit (3)；
Non-linear component (1) and compensating element, (2) are formed after being electrically connected in parallel, and access in sampled current branch (4) electrically connecting.
2. a kind of non-linear current sampling assemble according to claim 1, it is characterised in that described non-linear component (1) is made up of the two of reverse parallel connection groups of PNP type triode V21, V22；The base stage of audion V21 is connected with the emitter stage of colelctor electrode and audion V22；The base stage of audion V22 is connected with the emitter stage of colelctor electrode and audion V21, forms audion V21 and V22 and is connected in antiparallel, then is connected in parallel with linear resistance R21.
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| CN201620085739.1U CN205353179U (en) | 2016-01-28 | 2016-01-28 | Nonlinearity current sampling subassembly |
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| CN201620085739.1U CN205353179U (en) | 2016-01-28 | 2016-01-28 | Nonlinearity current sampling subassembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510681A (en) * | 2016-01-28 | 2016-04-20 | 南京交通职业技术学院 | Nonlinear current sampling assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105510681A (en) * | 2016-01-28 | 2016-04-20 | 南京交通职业技术学院 | Nonlinear current sampling assembly |
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Granted publication date: 20160629 Termination date: 20170128 |