CN209488537U - A kind of high AC impedance circuit and its application system - Google Patents
A kind of high AC impedance circuit and its application system Download PDFInfo
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- CN209488537U CN209488537U CN201920202427.8U CN201920202427U CN209488537U CN 209488537 U CN209488537 U CN 209488537U CN 201920202427 U CN201920202427 U CN 201920202427U CN 209488537 U CN209488537 U CN 209488537U
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Abstract
The utility model embodiment discloses a kind of high AC impedance circuit and its application system, the high AC impedance circuit is placed between DC terminal and exchange end, the high AC impedance circuit is placed between DC terminal and exchange end, the high AC impedance circuit includes the first triode Q1, and the DC terminal is based on Q1 input dc power to exchanging end；It is in series with base resistance in DC terminal and the base stage of the Q1, is provided with AC signal feedback circuit in the base stage of exchange end and the Q1.Deficiency present in existing inductive circuit can be replaced using the device of smaller cost in the utility model embodiment, the method that tradition realizes high AC impedance circuit with big inductance can be improved by large current characteristic in magnification region by triode.
Description
Technical field
The utility model relates to electronic circuit technology field more particularly to a kind of high AC impedance circuit and its application systems
System.
Background technique
Existing elevator intercom system realizes the power supply of intercommunication terminal using two-wire system bus, and uses bus transfer simultaneously
Voice signal, and this bus is also usually applied to various circuit structures using lower realization direct current supply and transmission of speech signals
In.Using its needs of the elevator intercom system of two-wire system in face of how to pass through bus to the power supply of each intercommunication terminal simultaneously simultaneously with same
The problem of to bus transfer voice signal, entire bus-type system need a kind of DC impedance smaller and the biggish device of AC impedance
Part or circuit, be placed in DC terminal end with exchange between end.
Existing realization direct current supply exchanges end high resistant using big inductance value inductance L0 under AC signal transmission mode to realize
Anti-, as shown in fig. 1, the left side inductance L0 is DC terminal to entire equivalent schematic diagram, i.e. DC terminal supplies power for, and the right is exchange
End, the i.e. high frequency ac signals such as voice can be transmitted at exchange end, and inductance L0 can indicate the impedance of AC signal are as follows:
Z0=R0+jωL0；Wherein R0For the resistance of inductance, L0For inductance value.In the certain situation of AC signal angular frequency, inductance value
Bigger, inductance is bigger to the impedance of AC signal, smaller to the decaying of the signal at exchange end.
Here exchange end high impedance function is realized, using big inductance value inductance in order to ensure DC voltage passes through after inductance
Pressure drop is small as far as possible, therefore the resistance of inductance must be made low as far as possible, to need to use thicker conducting wire coiling inductance, this allows for electricity
It is excessive to feel volume, increased costs.Moreover, DC voltage is dynamic by the pressure drop after inductance, therefore is exported when curent change
Voltage be also dynamic, be the requirement for being extremely difficult to voltage range in the demanding occasion of some voltage ranges.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, the utility model provides a kind of high AC impedance
Circuit and its application system can replace deficiency present in existing inductive circuit using the device of smaller cost, lead to
The side that tradition realizes high exchange end high impedance with big inductance can be improved by large current characteristic in magnification region by crossing triode
Method.
To solve the above-mentioned problems, the utility model proposes a kind of high AC impedance circuit, the high AC impedance electricity
Road is placed between DC terminal and exchange end, and the high AC impedance circuit includes the first triode Q1, and the DC terminal is based on Q1
Input dc power is to exchanging end；In DC terminal and the base stage of the Q1 it is in series with base resistance, in exchange end and the Q1
AC signal feedback circuit is provided in base stage.
The AC signal feedback circuit includes feedback network circuit and discharge loop, the feedback network circuit and described
Discharge loop forms the base stage that parallel circuit one end is connected to the Q1, and the other end is connected to exchange end.
The base resistance includes that resistance R4 and resistance R5, the R4 and the R5 are cascaded, and the R4 is connected to
DC terminal, the R5 are connected to the base stage of Q1.
The feedback network circuit includes capacitor C1 and resistance R7, and the discharge loop includes resistance R8；The R8 is institute
It states C1 and discharge loop is provided.
The Q1 is NPN type single-stage or multilevel semiconductor triode or is three pole of positive-negative-positive single-stage or multilevel semiconductor
Pipe.
The high AC impedance circuit further includes current-limiting circuit, and the current-limiting circuit includes the second triode Q2 and resistance
R6, the Q2 are NPN type transistor, in which:
The emitter of the base stage of the Q2 and the Q1 are connected to R6；
The collector of the Q2 is connected to the base stage of the Q1；
The emitter of the Q2 is connected to exchange end；
The collector and emitter of the Q2 and the feedback network circuit and discharge loop are formed together parallel circuit one
End is connected to the base stage of the Q1, and the other end is connected to exchange end.
The high AC impedance circuit further includes diode D1 and third transistor Q3, the Q3 are NPN type triode,
Wherein:
The cathode of the D1 is connected to exchange end, and the anode of the D1 is connected to the emitter of Q3；
The base stage of the Q3 is connected to DC terminal, and the collector of the Q3 is connected on the circuit between the R4 and R5.
It include resistance R1, resistance R2, resistance R3 and capacitor C2 between the base stage and DC terminal of the Q3, in which:
The one end resistance R1 is connected to DC terminal, and the R1 other end is connected in parallel to the R2 and R3；
Described one end R2 is connected to R1, the R2 other end and the C2 earth；
Described one end R3 and R2 are connected in parallel R1, and the R3 other end and the C2 are connected in parallel the ground level of Q3；
Described one end C2 and the R2 earth, the C2 and the R3 are connected in parallel the base stage of Q3.
Correspondingly, the utility model also proposed a kind of elevator intercom system, the elevator intercom system be based on bus with
Each intercommunication terminal power supply, and simultaneously using with a pair of of bus transfer voice signal, bus supply DC terminal with exchange end it
Between be provided with above-described AC impedance circuit.
Correspondingly, the utility model also proposed a kind of system, the system is based on same route and realizes direct current supply extremely
Load end, and signal is transmitted to load end based on exchange end, above-described exchange is provided between DC terminal and exchange end
Impedance circuit.
In the utility model embodiment, can using AC signal feedback circuit AC signal from the electric current of triode
Output end feeds back to base stage, by triode amplification, original AC signal is maintained by network degradation, not can be equivalent to
One AC impedance is infinitely great network, therefore, can substitute traditional high inductance value inductance, so reduce the volume of product with
Cost, and the DC voltage of output end can satisfy some pairs of voltage change ranges and have certain requirements in controlled range
Occasion.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is to be realized under direct current supply in the prior art and AC signal transmission mode using big inductance value inductance L0
Exchange end end high impedance circuit schematic diagram；
Fig. 2 is the high AC impedance circuit theory schematic diagram based on NPN type triode in the utility model embodiment；
Fig. 3 is the AC impedance circuit theory based on NPN type triode with overcurrent protection in the utility model embodiment
Schematic diagram；
Fig. 4 is the high AC impedance circuit theory schematic diagram based on PNP type triode in the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
High AC impedance circuit involved in the utility model is placed between DC terminal and exchange end, the exchange resistance
Reactive circuit can realize that DC terminal exchanges end with realization to load end power supply and transmits signal to load end, which sets
Between DC terminal and exchange end, the high AC impedance circuit includes the first triode Q1, and the DC terminal is inputted based on Q1
Direct current is to exchanging end；It is in series with base resistance in DC terminal and the base stage of the Q1, the base stage at exchange end and the Q1
On be provided with AC signal feedback circuit.
It should be noted that the Q1 can be NPN type single-stage or multilevel semiconductor triode or positive-negative-positive single-stage or more
Level semiconductor triode.Transistor type in the utility model can be bipolar transistor (BJT), bipolar transistor
Pipe forms emitter (Emitter), base stage (Base) and collector (Collector) with p-type by N-type respectively.Fig. 2 shows
High AC impedance circuit theory schematic diagram and Fig. 3 based on NPN type triode are shown based on NPN type triode band overcurrent
The AC impedance circuit theory schematic diagram of protection specifically can be refering to Fig. 2 extremely based on high the realized process of AC impedance circuit
Content shown in Fig. 3.The AC impedance circuit include: direct-flow input end Vin, DC output end Vout, load end RL, resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, diode D1, first capacitor C1, the second capacitor
C2, the first triode Q1, the second triode Q2 and third transistor Q3 etc..
It should be noted that high AC impedance circuit here is powered to load end for realizing DC terminal and is exchanged with realization
It holds to load end and transmits signal, the collector of the Q1 is connected to DC terminal, and the emitter of Q1 is connected to resistance R6, the connection of the one end R6
The emitter output end of Q1, the R6 other end be connected to exchange end；It is in series with base resistance on the ground level of DC terminal and Q1,
It is provided with feedback network circuit and discharge loop in the base stage of exchange end and Q1, the feedback network circuit and discharge loop composition one
A AC signal feedback circuit；The feedback network circuit and discharge loop form the base stage that parallel circuit one end is connected to Q1, separately
One end is connected to exchange end.
The base resistance includes resistance R4 and resistance R5, and the R4 and R5 are cascaded, which is connected to DC terminal, should
R5 is connected to the base stage of Q1.
The feedback network circuit includes capacitor C1 and resistance R7, which includes R8；The R8 provides for C1 to discharge back
Road.
The base stage of Q2 on the AC impedance circuit and the emitter of the Q1 are connected to R6；The collector and emitter of Q2
It is formed together the base stage that parallel circuit one end is connected to Q1 with feedback network circuit and discharge loop, the other end is connected to exchange
End.That is the collector of the Q2 base stage that is connected to Q1, the emitter of Q2 are connected to exchange end.
Here the cathode of D1 is connected to exchange end, and the anode of D1 is connected to the emitter of Q3；The ground level of the Q3 is connected to
DC terminal, the collector of Q3 are connected on the circuit between the R4 and R5.
It here include resistance R1, resistance R2, resistance R3 and capacitor C2 between the ground level and DC terminal of Q3, in which: resistance R1
One end is connected to DC terminal, and the R1 other end is connected in parallel to the R2 and R3；The one end R2 is connected to R1, the R2 other end with
The C2 earth；The one end R3 and R2 are connected in parallel R1, which is connected in parallel the ground level of Q3 with the C2；It should
The one end C2 and the R2 earth, the C2 and R3 are connected in parallel the ground level of Q3.
Here Q1 can use Darlington transistor, and Darlington transistor refers to that two triodes are connected together, the pole of Darlington transistor
Property be first triode polarity, the amplification factor of Darlington transistor is the product of two triode amplification factors, therefore reaches woods
The pipe that pauses is normally acting in highly sensitive amplifying circuit such as high-power switching circuit, plays a part of to amplify very small signal.
In the utility model embodiment shown in Fig. 2 and Fig. 3 in Q1, Q2, Q3 all use NPN silicone tube type triode.Its
In, have base stage B, collector C and emitter E in Q1, Q2, Q3 here, the working condition of triode by each pole voltage potential
It determines:
As emitter voltage gesture UELess than base voltage gesture UB, and base voltage gesture UBLess than collector voltage gesture UCWhen, i.e.,
UE< UB< UCWhen, the triode of NPN silicon cast is in magnifying state；
As emitter voltage gesture UEGreater than base voltage gesture UB, and collector voltage gesture UCGreater than base voltage gesture UBWhen, i.e.,
UE> UBAnd UC> UBWhen, the triode of NPN silicon cast is in off state；
As base voltage gesture UBGreater than emitter voltage gesture UE, and base voltage gesture UBGreater than collector voltage gesture UCWhen, i.e.,
UB> UEAnd UB> UCWhen, the triode of NPN silicon cast is in a saturated state.
Specifically, the collector C of the Q1 is connected with direct-flow input end Vin, the base stage B of Q1 is inputted by R4, R5 and direct current
Vin is held to be connected, the emitter E of Q1 realizes direct current output to load end RL by R6；Therefore in the AC impedance circuit course of work
In, the base voltage gesture U of Q1BLess than collector voltage gesture UC1, and emitter voltage gesture UE1Less than base voltage gesture UB1, Da Lin
The pipe Q1 that pauses is constantly in the state of amplification in course of normal operation, and Q1 plays a part of to amplify very small signal.
Specifically, the collector C of the base stage B and Q2 of Q1 is connected, the emitter E of Q1 is connected with the base stage B of Q2；The base of Q2
Pole B is connected on the route of Q1 to R6；In the high AC impedance circuit course of work, the emitter voltage gesture U of Q2E2Greater than base stage
Voltage potential UB2, the collector voltage gesture U of Q2C2Base voltage gesture U greater than Q2B2, Q2 is constantly in course of normal operation to be cut
State only.In addition, being in off state in Q2, the Q2 and resistance R6 play the role of limitation output size of current jointly；Root
The voltage V between base stage B and emitter E according to the characteristic of NPN silicon cast triode, on Q2BEThe V in off stateBE≤
0.7V, the maximum current of the high AC impedance circuit at DC output end OUT are
First capacitor C1, resistance R7 in the utility model embodiment collectively constitute feedback network circuit, the feedback network
The connection of the base stage of circuit on one side and Q1, one end is connect with DC output end；R8 provides discharge loop for C1, the discharge loop and
Feedback network circuit is formed together parallel circuit, and in the base stage of an end Jie Q1, one end is connect with DC output end.
D1, Q3, R1, R2, R3 and C2 in the utility model embodiment collectively constitute short circuit, overcurrent protection network.
Specifically, the base stage B of Q3 is connected by R3, R1 with direct-flow input end Vin；The collector C of Q3 is accessed in R4 and R5
Between route on；The emitter E of Q3 is connected to DC current output end vo ut by diode D1.Therefore, in AC impedance
Circuit is in course of normal operation, the emitter voltage gesture U of Q3E3Greater than base voltage gesture UB3, and the collector voltage gesture on Q3
UC3Greater than base voltage gesture UB3, therefore Q3 is constantly in the state of cut-off in course of normal operation.Short circuit, overcurrent at this time
Network is protected not work, the voltage V of DC output end VoutoutWith DC output end voltage VinRising and rise.
The maximum current of the AC impedance circuit at DC output end Vout beThat is the 7th in shown in Fig. 2 and Fig. 3
The maximum current at place isIt should be noted that in embodiments of the present invention, can 7 shown in the figure at load voice, FSK etc.
AC signal is used for the transmitting of information, and the concrete type of signal is not construed as limiting in embodiments of the present invention.
Once and electric current consumed by the AC signal loaded at Fig. 2 or shown in Fig. 37 is closeIt can go out at 7
Existing overcurrent or the situation of short circuit, at this time the voltage potential U at 77It can drop to and be infinitely close to zero；Due to the emitter voltage gesture of Q3
UE3With the voltage potential V at figure shown 77It is equal, therefore the emitter voltage U of Q3E3Also it can accordingly drop to and be infinitely close to zero；Due to
The emitter voltage U of Q3E3It is infinitely close to zero, therefore in Q3, the emitter voltage gesture UE3 on Q3 is less than the base voltage on Q1
Gesture UB1, and the collector voltage gesture UC3 on Q3 is greater than the base voltage gesture UB1 on Q1, third transistor Q3 is by cut-off shape at this time
State becomes on state.
Due to third transistor Q3Conducting, thus shown in Fig. 2 or Fig. 3 in voltage potential at 4 can reduce, correspondingly, reach
The base voltage gesture U of Islington pipe Q1B1When can also reduce, therefore overcurrent or short circuit occur, Darlington transistor Q1 can be in weak conducting
State；Under weak on state, the passable collector current I of Darlington transistor Q1C1Very little, Darlington transistor Q1 consumption at this time
It is much smaller when power ratio is fully on；The conducting of third transistor Q3, the voltage being loaded on resistance R5 can reduce, but due to straight
Flow the input voltage V at endinIt is constant, therefore be loaded into and will increase with the voltage of the concatenated resistance R4 of resistance R5, corresponding resistor R4's
Consumption power also will increase, i.e. dissipated power caused by resistance R4 needs to consume because of short circuit or overcurrent.
In high AC impedance circuit provided in an embodiment of the present invention, short circuit or overcurrent is occurring, by by the three or three pole
Pipe Q3 becomes on state from off state, so that the power of Darlington transistor Q1 is transferred on resistance R4, makes Darlington transistor Q1
It is protected when short circuit or overcurrent occurs, avoids cause thermal damage of the Darlington transistor Q1 in overcurrent or short circuit.Due to resistance
R4 needs to dissipate input voltage VinMost of power of generation, therefore resistance R4Selection need to be according to input voltage VinIt determines,
That is resistance R4Maximum power should be greater than
After overcurrent or short circuit disappear, 7 in figure at be linked into the high AC impedance circuit again, at this time 7 in figure
Locate voltage potential U7It begins to ramp up, the emitter voltage U of Q3E3Also the state before overcurrent or short circuit occurs can be accordingly risen to, because
This Q3 comes back to off state by state；After Q3 is restored back to off state, at this time 4 in figure at voltage potential can increase,
Correspondingly, the base voltage gesture U of Darlington transistor Q1B1Also can rise, therefore Darlington Q1 can also be come back to by weak on state
Magnifying state, the high AC impedance circuit restore normal.
The short circuit, the setting of overcurrent protection network can be in high AC impedance circuits when short circuit, overcurrent occurs
Important amplifier element Darlington transistor Q1 protected；In addition, after short circuit, over-current phenomenon avoidance disappear, the high AC impedance circuit
Can be with self- recoverage to normal condition, practicability is good.
Fig. 2 is the equivalent electricity of AC impedance circuit when short circuit, overcurrent protection network are inactive in the utility model embodiment
Lu Tu, or only play the circuit diagram under high AC impedance.When short circuit, overcurrent protection network are inactive, height exchange resistance
The circuit diagram of reactive circuit can be reduced to equivalent circuit diagram as shown in Figure 2；It should be noted that due to short circuit, overcurrent protection net
Network is inactive, and the second triode Q2 does not also have an effect, therefore can ignore the second triode Q2 in isoboles.
When high AC impedance circuit is in quiescent point, there is an original excitation δ V (to can be voice, FSK at this time
Equal AC signals) it is loaded at 7 in figure, the excitation can partially be decayed when load, set attenuation coefficient as k1；Then, this swashs
Encouraging can be transmitted at 5 in figure by feedback network first capacitor C1, resistance R7, set attenuation coefficient here as k2, therefore in figure
Voltage at 5 can generate the variation of k1*k2* δ V, and due to VinIt is constant, it then passes through the base current at R4, R5 and becomes
Change, can indicate are as follows:
According to the amplification characteristic of triode, triode Q1 is in magnifying state, therefore in triode Q1, it is believed that Q1
Voltage V between upper collector, emitterCEWith base current IBDirectly proportional, all proportionality coefficient is β, the collector of triode Q1 for this
C, the voltage change between emitter E can indicate are as follows:
By resistance R6Attenuation coefficient be k3, at this time 7 in figure at voltage change can state are as follows:
Thus, δ V7It, will not be by when original excitation δ V only being needed to be loaded into 7 in figure here with the same phase of original excitation δ V
Decaying, as long as meeting following formula:
Therefore, as long as meeting above-mentioned equation, it is infinitely great net that the circuit of Fig. 2, which can be equivalent to a high AC impedance,
Network；Wherein, direct-flow input end VinDC power supply is provided, and be loaded at 7 in figure it is ac-excited will not be attenuated, therefore can be with
AC signals, the circuits such as voice, FSK are transmitted at 7 can substitute traditional big inductance value inductance completely, solve existing big sense
It is worth the problems of inductance and deficiency.Circuit shown in Fig. 2 is using resistance-capacitance network AC signal from the transmitting of triode
Pole feeds back to base stage, by triode amplification, original AC signal is maintained by network degradation, not can be equivalent to one
AC impedance is infinitely great network, therefore, can substitute traditional high inductance value inductance, so reduce the volume of product at
This, and the DC voltage of output end is in controlled range, can satisfy some pairs of voltage change ranges and has certain requirements field
It closes.
Fig. 4 shows the high AC impedance circuit theory signal based on PNP type triode in the utility model embodiment
Figure, high AC impedance circuit shown in Fig. 4 includes: PNP type triode Q1, resistance R6, resistance R4, resistance R5, capacitor C1, electricity
Hinder R7, resistance R8 and load RL etc..Resistance R6 is in series on the emitter of Q1, the emitter of Q1 is based on R6 and is connected to direct current
End；Base resistance R4 and R5 are in series in the base stage of Q1, the base stage of Q1 is based on base resistance and is connected to DC terminal；The current collection of Q1
Pole is connected to load end, i.e. the collector of Q1 may be implemented to extend outside direct current output to the collector of load end and Q1 defeated
Outlet is loaded with exchange end, and is realized at direct current output and AC signal to load RL simultaneously；In the base stage of exchange end and Q1
It is provided with AC signal feedback circuit, AC signal feedback circuit includes feedback network circuit and discharge loop, the feedback net
Network circuit and the discharge loop form the base stage that parallel circuit one end is connected to the Q1, and the other end is connected to exchange end, tool
Body, which includes capacitor C1 and resistance R7, which includes resistance R8, and R8 here provides for C1 to be put
Electrical circuit.
It should be noted that Q1 shown in Fig. 4 can be positive-negative-positive single-stage or multilevel semiconductor triode etc..
Here it sets circuit shown in Fig. 4 and is in quiescent point (i.e. Q1 is in amplification region), at this time, it is assumed that have an original
Begin that δ V (can be the AC signals such as voice, FSK) is motivated to be loaded at 47, which can partially be decayed, it is assumed that attenuation coefficient
For k1, later, the excitation can be by feedback network C1, R7 to 45 at, set attenuation coefficient is k2, thus 45 in figure at
Voltage has the variation of k1*k2* δ V, and since Vin is constant, then passing through the base current at R4, R5 changes, and can indicate
Are as follows:
According to the amplification characteristic of BJT triode, Q1 works in amplification region, and the base current of middle Q1 and C, E shown in Fig. 4 are extremely electric
It is pressed into direct ratio, sets its proportionality coefficient as β, therefore C, E pole tension variation of Q1 can indicate are as follows:
Voltage change between shown in Fig. 4 41 and 47 are as follows:
And due to the pole the C Vin of Q1 be it is constant, 7 in figure at voltage change can be expressed as
It follows that δ V7With the same phase of original excitation δ V, it is loaded at 7 in figure and is not declined if necessary to original excitation δ V
Subtract, meet following formula:
By analyzing above, as long as meeting above formula, circuit shown in Fig. 4 can be equivalent to an AC impedance as infinity
Network, Vin is direct-flow input end, and be loaded at 47 shown in Fig. 4 it is ac-excited will not be attenuated, therefore can be
AC signal is loaded at 47 to transmit voice, FSK etc., and the circuit can substitute traditional big inductance value inductance completely.
Fig. 2 can be applied in elevator intercom system to high AC impedance circuit shown in Fig. 4, to realize elevator intercommunication
System is based on bus and each intercommunication terminal is powered, and simultaneously using same a pair of of bus transfer voice signal, in the straight of bus supply
Flow end and exchange the AC impedance circuit being arranged in the utility model embodiment between end, can maintain in bus voice signal or
AC signal will not be decayed by transmission network, and can be equivalent to an AC impedance is infinitely great network, can substitute tradition
High inductance value inductance, and then reduce the volume and cost of product, and the DC voltage of output end is in controlled range, can be compared with
Meet that voltage change range on elevator device requires well is applicable in.
Fig. 2 can be applied to realize direct current supply to load based on same route to high AC impedance circuit shown in Fig. 4
End is provided with this between the DC terminal in system and exchange end with based on exchanging on end transmission signal to the system of load end
AC impedance circuit in utility model embodiment, can maintain the AC signal on same route not decline to transmission network
Subtract, can be equivalent to the network of one high AC impedance infinity, reduces DC terminal end and decay to the signal at exchange end end, it can
To substitute traditional high inductance value inductance, and then reduce the volume and cost of product, and the DC voltage of output end is in controllable model
In enclosing, can preferably meet that system electrification pressure variation range requires is applicable in.
It should be noted that the DC output end in the utility model is DC terminal, ac output end is to exchange end.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
In addition, having been carried out in detail to high AC impedance circuit provided by the utility model embodiment and its application system above
Thin to introduce, specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range, in conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. a kind of high AC impedance circuit, which is characterized in that the high AC impedance circuit is placed between DC terminal and exchange end,
The high AC impedance circuit includes the first triode Q1, and the DC terminal is based on Q1 input dc power to exchanging end；In direct current
It is in series with base resistance in the base stage of end and the Q1, AC signal feedback electricity is provided in the base stage of exchange end and the Q1
Road.
2. high AC impedance circuit as described in claim 1, which is characterized in that the AC signal feedback circuit includes feedback
Lattice network and discharge loop, the feedback network circuit and the discharge loop form parallel circuit one end and are connected to the Q1
Base stage, the other end be connected to exchange end.
3. high AC impedance circuit as described in claim 1, which is characterized in that the base resistance includes resistance R4 and resistance
R5, the R4 and the R5 are cascaded, and the R4 is connected to DC terminal, and the R5 is connected to the base stage of Q1.
4. high AC impedance circuit as claimed in claim 2, which is characterized in that the feedback network circuit include capacitor C1 and
Resistance R7, the discharge loop include resistance R8；The R8 provides discharge loop for the C1.
5. such as the described in any item high AC impedance circuits of Claims 1-4, which is characterized in that the Q1 be NPN type single-stage or
Multilevel semiconductor triode or be positive-negative-positive single-stage or multilevel semiconductor triode.
6. high AC impedance circuit as claimed in claim 5, which is characterized in that the high AC impedance circuit further includes current limliting
Circuit, the current-limiting circuit includes the second triode Q2 and resistance R6, the Q1 are NPN type transistor, and the Q2 is
NPN type transistor, in which:
The emitter of the base stage of the Q2 and the Q1 are connected to R6；
The collector of the Q2 is connected to the base stage of the Q1；
The emitter of the Q2 is connected to exchange end；
The AC signal feedback circuit includes feedback network circuit and discharge loop, the collector and emitter of the Q2 and institute
It states feedback network circuit and discharge loop is formed together the base stage that parallel circuit one end is connected to the Q1, the other end is connected to hand over
Flow end.
7. high AC impedance circuit as claimed in claim 6, which is characterized in that the high AC impedance circuit further includes two poles
Pipe D1 and third transistor Q3, the Q3 are NPN type triode, in which:
The cathode of the D1 is connected to exchange end, and the anode of the D1 is connected to the emitter of Q3；
The base resistance includes resistance R4 and resistance R5, and the base stage of the Q3 is connected to DC terminal, and the collector of the Q3 connects
It connects on the circuit between the R4 and R5.
8. high AC impedance circuit as claimed in claim 7, which is characterized in that include electricity between the base stage and DC terminal of the Q3
Hinder R1, resistance R2, resistance R3 and capacitor C2, in which:
Described one end R1 is connected to DC terminal, and the R1 other end is connected in parallel to the R2 and R3；
Described one end R2 is connected to R1, the R2 other end and the C2 earth；
Described one end R3 and R2 are connected in parallel R1, and the R3 other end and the C2 are connected in parallel the ground level of Q3；
Described one end C2 and the R2 earth, the C2 and the R3 are connected in parallel the base stage of Q3.
9. a kind of elevator intercom system, which is characterized in that the elevator intercom system is based on bus and each intercommunication terminal is powered, and
Simultaneously using with a pair of of bus transfer voice signal, it is arranged between the DC terminal and exchange end of bus supply just like claim
1 to 8 described in any item high AC impedance circuits.
10. a kind of system, which is characterized in that the system is based on handing over based on same route realization direct current supply to load end
It flows end and transmits signal to load end, high friendship as claimed in any one of claims 1 to 8 is provided between DC terminal and exchange end
Flow resistance reactive circuit.
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