CN205280802U - Three phase three wire system voltage sampling circuit - Google Patents
Three phase three wire system voltage sampling circuit Download PDFInfo
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- CN205280802U CN205280802U CN201521110198.5U CN201521110198U CN205280802U CN 205280802 U CN205280802 U CN 205280802U CN 201521110198 U CN201521110198 U CN 201521110198U CN 205280802 U CN205280802 U CN 205280802U
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Abstract
The utility model provides a three phase three wire system voltage sampling circuit, including first sampling voltage reducing module, second sampling voltage reducing module, third sampling voltage reducing module, opposition proportion operational amplifier circuit, first homophase proportion operational amplifier circuit, second homophase proportion operational amplifier circuit, third homophase proportion operational amplifier circuit, each voltage reducing module's that samples input respectively with being connected corresponding of three -phase output of outside electric wire netting, each voltage reducing module's that samples output is connected with opposition proportion operational amplifier circuit's input respectively, and opposition proportion operational amplifier circuit's output is connected with each homophase proportion operational amplifier circuit's input respectively, the utility model discloses a be connected to this sampling circuit the input of internal three phase three wire system power factor correction module to the realization just need not to use isolation transformer on being applied to the three phase three wire system power factor correction module of home external communication power equipment, also can make external communication power equipment normally work.
Description
Technical field
This utility model relates to circuit engineering field, particularly relates to a kind of three-phase three-wire system voltage sampling circuit.
Background technology
The type of the active power factor correcting module in power supply power supply is divided into two kinds: three-phase three-wire system active power factor correcting module, three-phase four-wire system active power factor correcting module.
What be most frequently with in the power supply power supply of China is three-phase four-wire system active power factor correcting module, and this three-phase four-wire system active power factor correcting module is the 220V Communication power equipment with center line mainly for domestic specified input and output phase voltage. And external power supply is generally adopted by three-phase three-wire system active power factor correcting module, this three-phase three-wire system active power factor correcting module is 220V and the Communication power equipment without center line mainly for specified input-output line voltage. And if domestic existing three-phase three-wire system active power factor correcting module or three-phase four-wire system active power factor correcting module are applied in the Communication power equipment of external three-phase three-wire system, then can cause that external Communication power equipment cannot normal operation.
In order to solve this problem, prior art increases isolating transformer by the outfan of three-phase four-wire system active power factor correcting module at home, external Communication power equipment is connected to the outfan of isolating transformer, so that external Communication power equipment normal operation. But the increase of isolating transformer causes that power supply cost and area occupied increase.
Utility model content
This utility model provides a kind of three-phase three-wire system voltage sampling circuit, to realize being applied on external Communication power equipment by domestic three-phase three-wire system power factor correction module, and without using isolating transformer, it is possible to make external Communication power equipment normal operation.
A kind of three-phase three-wire system voltage sampling circuit that this utility model provides, including: the first sampling voltage reduction module, the second sampling voltage reduction module, the 3rd sampling voltage reduction module, anti-phase scale operation amplifying circuit, the first in-phase proportion operational amplification circuit, the second in-phase proportion operational amplification circuit, the 3rd in-phase proportion operational amplification circuit;
The input of described first sampling voltage reduction module is connected with the first-phase of the three-phase output end of external electrical network, the outfan of described first sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described first in-phase proportion operational amplification circuit;
The input of described second sampling voltage reduction module is connected with the second-phase of the three-phase output end of external electrical network, the outfan of described second sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described second in-phase proportion operational amplification circuit;
The input of described 3rd sampling voltage reduction module is connected with the third phase of the three-phase output end of external electrical network, the outfan of described 3rd sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described 3rd in-phase proportion operational amplification circuit.
Three-phase three-wire system voltage sampling circuit as above, described first sampling voltage reduction module includes: the first sampling reduction voltage circuit, first penetrate with follower; The input of described first sampling reduction voltage circuit is connected with the first-phase of the three-phase output end of described external electrical network, the outfan of described first sampling reduction voltage circuit is penetrated with described first and is connected with the input of follower, and described first penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit;
Described second sampling voltage reduction module includes: the second sampling reduction voltage circuit, second penetrate with follower; The input of described second sampling reduction voltage circuit is connected with the second-phase of the three-phase output end of described external electrical network, the outfan of described second sampling reduction voltage circuit is penetrated with described second and is connected with the input of follower, and described second penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit;
Described 3rd sampling voltage reduction module includes: the 3rd sampling reduction voltage circuit, the 3rd penetrate with follower; The input of described 3rd sampling reduction voltage circuit is connected with the third phase of the three-phase output end of described external electrical network, the outfan of described 3rd sampling reduction voltage circuit is penetrated with the described 3rd and is connected with the input of follower, and the described 3rd penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit.
Three-phase three-wire system voltage sampling circuit as above, described first sampling reduction voltage circuit includes the first resistance, the second resistance; First end of described first resistance is connected with the first-phase of the three-phase output end of described external electrical network, first end of the second end of described first resistance and described second resistance is connected to the first junction point, second end ground connection of described second resistance, described first junction point is penetrated with described first and is connected with the input of follower;
Described second sampling reduction voltage circuit includes the 3rd resistance, the 4th resistance; Described first end of the 3rd resistance is connected with the second-phase of the three-phase output end of described external electrical network, second end of described 3rd resistance and the first end of described 4th resistance are connected to the second junction point, second end ground connection of described 4th resistance, described second junction point is penetrated with described second and is connected with the input of follower;
Described 3rd sampling reduction voltage circuit includes the 5th resistance, the 6th resistance; Described first end of the 5th resistance is connected with the third phase of the three-phase output end of described external electrical network, second end of described 5th resistance and the first end of described 6th resistance are connected to the 3rd junction point, second end ground connection of described 6th resistance, described 3rd junction point is penetrated with the described 3rd and is connected with the input of follower.
Three-phase three-wire system voltage sampling circuit as above, described anti-phase scale operation amplifying circuit includes: the first input resistance, the second input resistance, the 3rd input resistance, the first feedback resistance, balancing resistance, the first operational amplifier;
First end of described first input resistance is penetrated with described first and is connected with the outfan of follower, first end of the second end of described first input resistance and described first feedback resistance is connected to the 4th junction point, and described 4th junction point is connected with the reverse input end of described first operational amplifier; Second end of described first feedback resistance is connected with the outfan of described first operational amplifier;
First end of described second input resistance is penetrated with described second and is connected with the outfan of follower, first end of the second end of described second input resistance and described first feedback resistance is connected to the 5th junction point, described 5th junction point is connected with the reverse input end of described first operational amplifier, and described 4th junction point is connected with described 5th junction point;
First end of described 3rd input resistance is penetrated with the described 3rd and is connected with the outfan of follower, and the second end of described 3rd input resistance is connected with described 5th junction point;
First end of described balancing resistance is connected with the positive input of described first operational amplifier, the second end ground connection of described balancing resistance.
Three-phase three-wire system voltage sampling circuit as above, described first in-phase proportion operational amplification circuit includes: the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second feedback resistance, the second operational amplifier; First end ground connection of described 7th resistance, second end of described 7th resistance and the first end of described second feedback resistance are connected to the 6th junction point, described 6th junction point is connected with the reverse input end of described second operational amplifier, and the second end of described second feedback resistance is connected with the outfan of described second operational amplifier; First end of described 8th resistance is penetrated with described first and is connected with the outfan of follower, first end of described 9th resistance is connected with the outfan of described first operational amplifier, second end of described 8th resistance and the second end of described 9th resistance are connected to the 7th junction point, and described 7th junction point is connected with the positive input of described second operational amplifier; First end ground connection of described tenth resistance, the second end of described tenth resistance is connected with described 7th junction point;
Described second in-phase proportion operational amplification circuit includes: the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 3rd feedback resistance, the 3rd operational amplifier; First end ground connection of described 11st resistance, second end of described 11st resistance and the first end of described 3rd feedback resistance are connected to the 8th junction point, described 8th junction point is connected with the reverse input end of described 3rd operational amplifier, and the second end of described 3rd feedback resistance is connected with the outfan of described 3rd operational amplifier; First end of described 12nd resistance is penetrated with described second and is connected with the outfan of follower, first end of described 13rd resistance is connected with the outfan of described first operational amplifier, second end of described 12nd resistance and the second end of described 13rd resistance are connected to the 9th junction point, and described 9th junction point is connected with the positive input of described 3rd operational amplifier; First end ground connection of described 14th resistance, the second end of described 14th resistance is connected with described 9th junction point;
Described 3rd in-phase proportion operational amplification circuit includes: the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 4th feedback resistance, four-operational amplifier; First end ground connection of described 15th resistance, second end of described 15th resistance and the first end of described 4th feedback resistance are connected to the tenth junction point, described tenth junction point is connected with the reverse input end of described four-operational amplifier, and described second end of the 4th feedback resistance is connected with the outfan of described four-operational amplifier; First end of described 16th resistance is penetrated with the described 3rd and is connected with the outfan of follower, first end of described 17th resistance is connected with the outfan of described first operational amplifier, second end of described 16th resistance and the second end of described 17th resistance are connected to the 11st junction point, described 11st junction point is connected with the positive input of described four-operational amplifier, first end ground connection of described 18th resistance, the second end of described 18th resistance is connected with described 11st junction point.
Three-phase three-wire system voltage sampling circuit of the present utility model, by by the first sampling voltage reduction module in this circuit, second sampling voltage reduction module, the corresponding output of the three-phase output end that the input of the 3rd sampling voltage reduction module is connected to external electrical network is gone up mutually, each outfan sampling voltage reduction module is all connected with the input of anti-phase scale operation amplifying circuit, the voltage signal of each sampling voltage reduction module output calculates a total voltage signal through anti-phase scale operation amplifying circuit, then the voltage signal of respectively sampling voltage reduction module output respectively with go up corresponding in-phase proportion operational amplification circuit mutually through each output after this total voltage Signal averaging and be calculated, finally draw the voltage sampling signal of each output phase, then each voltage sampling signal exporting phase obtained is inputted to domestic three-phase three-wire system power factor correction module, namely, this sample circuit is connected to the input of domestic three-phase three-wire system power factor correction module, so that domestic three-phase three-wire system power factor correction module is mated with external three-phase three-wire system Communication power equipment, make external Communication power equipment normal operation, circuit control principle of the present utility model is simple, and without connecting isolating transformer at the outfan of three-phase four-wire system power factor correction module as prior art, thus greatly reducing use cost and the volume of power-supply device.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structured flowchart of the three-phase three-wire system voltage sampling circuit that Fig. 1 provides for this utility model one embodiment;
Fig. 2 is physical circuit figure corresponding for Fig. 1.
Detailed description of the invention
For making the purpose of this utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
The structured flowchart of the three-phase three-wire system voltage sampling circuit that Fig. 1 provides for this utility model one embodiment. Fig. 2 is physical circuit figure corresponding for Fig. 1. With reference to shown in accompanying drawing 1 to accompanying drawing 2, the present embodiment provides a kind of three-phase three-wire system voltage sampling circuit, including: the first sampling voltage reduction module the 11, second sampling voltage reduction module the 12, the 3rd sampling voltage reduction module 13, anti-phase scale operation amplifying circuit the 2, first in-phase proportion operational amplification circuit the 31, second in-phase proportion operational amplification circuit the 32, the 3rd in-phase proportion operational amplification circuit 33.
Specifically, the input ACIN-A of the first sampling voltage reduction module 11 and first-phase (the such as A phase of the three-phase output end of external electrical network, not shown) connect, the outfan of the first sampling voltage reduction module 11 is connected with the input of anti-phase scale operation amplifying circuit 2, and the outfan of anti-phase scale operation amplifying circuit 2 and the input of the first in-phase proportion operational amplification circuit 31 connect. The input ACIN-B of the second sampling voltage reduction module 12 and second-phase (the such as B phase of the three-phase output end of external electrical network, not shown) connect, the outfan of the second sampling voltage reduction module 12 is connected with the input of anti-phase scale operation amplifying circuit 2, and the outfan of anti-phase scale operation amplifying circuit 2 and the input of the second in-phase proportion operational amplification circuit 32 connect. The input ACIN-C of the 3rd sampling voltage reduction module 13 and third phase (the such as C phase of the three-phase output end of external electrical network, not shown) connect, the outfan of the 3rd sampling voltage reduction module 13 is connected with the input of anti-phase scale operation amplifying circuit 2, and the outfan of anti-phase scale operation amplifying circuit 2 and the input of the 3rd in-phase proportion operational amplification circuit 33 connect. The outfan of the first in-phase proportion operational amplification circuit 31, the outfan of the second in-phase proportion operational amplification circuit 32, the 3rd in-phase proportion operational amplification circuit 33 outfan be connected to the input of domestic three-phase three-wire system power factor correction module.
The present embodiment is by by the first sampling voltage reduction module in sample circuit, second sampling voltage reduction module, the corresponding output of the three-phase output end that the input of the 3rd sampling voltage reduction module is connected to external electrical network is gone up mutually, each outfan sampling voltage reduction module is all connected with the input of anti-phase scale operation amplifying circuit, the voltage signal of each sampling voltage reduction module output calculates a total voltage signal through anti-phase scale operation amplifying circuit, then the voltage signal of respectively sampling voltage reduction module output respectively with go up corresponding in-phase proportion operational amplification circuit mutually through each output after this total voltage Signal averaging and be calculated, finally draw the voltage sampling signal of each output phase, then each voltage sampling signal exporting phase obtained is inputted to domestic three-phase three-wire system power factor correction module. namely, in use, this three-phase three-wire system voltage sampling circuit is connected to the input of domestic three-phase three-wire system power factor correction module, so that domestic three-phase three-wire system power factor correction module is mated with external three-phase three-wire system Communication power equipment, make external Communication power equipment normal operation, the circuit control principle of the present embodiment is simple, and without connecting isolating transformer at the outfan of three-phase four-wire system power factor correction module as prior art, thus greatly reducing use cost and the volume of power-supply device.
In the present embodiment, the first sampling voltage reduction module 11 may particularly include: the first sampling reduction voltage circuit 111, first penetrates with follower 112. The input of the first sampling reduction voltage circuit 111 and first-phase (the such as A phase of the three-phase output end of external electrical network, not shown) connect, the outfan and first of the first sampling reduction voltage circuit 111 is penetrated and is connected with the input of follower 112, and first penetrates the outfan with follower 112 is connected with the input of anti-phase scale operation amplifying circuit 2. Specifically, the first sampling reduction voltage circuit 111 includes the first resistance R33, the second resistance R10. First end of the first resistance R33 is connected with the first-phase (such as A phase) of the three-phase output end of external electrical network, second end of the first resistance R33 and first end of the second resistance R10 are connected to the first junction point a, the second end ground connection of the second resistance R10, the first junction point a and the first is penetrated and connects with the input of follower 112. First penetrate with follower 112 output voltage signal be V1.
Second sampling voltage reduction module 12 may particularly include: the second sampling reduction voltage circuit 121, second penetrates with follower 122. The input of the second sampling reduction voltage circuit 121 is connected with the second-phase (such as B phase) of the three-phase output end of external electrical network, the outfan and second of the second sampling reduction voltage circuit 121 is penetrated and is connected with the input of follower 122, and second penetrates the outfan with follower 122 is connected with the input of anti-phase scale operation amplifying circuit 2. Specifically, the second sampling reduction voltage circuit 121 includes the 3rd resistance R34, the 4th resistance R21. First end of the 3rd resistance R34 is connected with the second-phase (such as B phase) of the three-phase output end of external electrical network, second end of the 3rd resistance R34 and first end of the 4th resistance R21 are connected to the second junction point b, the second end ground connection of the 4th resistance R21, the second junction point b and the second is penetrated and connects with the input of follower 122. Second penetrate with follower 122 output voltage signal be V2.
3rd sampling voltage reduction module 13 may particularly include: the 3rd sampling reduction voltage circuit the 131, the 3rd is penetrated with follower 132. The input of the 3rd sampling reduction voltage circuit 131 is connected with the third phase (such as C phase) of the three-phase output end of external electrical network, the outfan and the 3rd of the 3rd sampling reduction voltage circuit 131 is penetrated and is connected with the input of follower 132, and the 3rd penetrates the outfan with follower 132 is connected with the input of anti-phase scale operation amplifying circuit 2. Specifically, the 3rd sampling reduction voltage circuit 131 includes the 5th resistance R35, the 6th resistance R28. First end of the 5th resistance R35 is connected with the third phase (such as C phase) of the three-phase output end of external electrical network, second end of the 5th resistance R35 and first end of the 6th resistance R28 are connected to the 3rd junction point c, the second end ground connection of the 6th resistance R28, the 3rd junction point c and the three is penetrated and connects with the input of follower 132. 3rd penetrate with follower 132 output voltage signal be V3.
In the present embodiment, anti-phase scale operation amplifying circuit 2 may particularly include: the first input resistance R7, the second input resistance R11, the 3rd input resistance R13, the first feedback resistance R8, balancing resistance R14, the first operational amplifier. Wherein, first end of the first input resistance R7 and first is penetrated and is connected with the outfan of follower 112, second end of the first input resistance R7 and first end of the first feedback resistance R8 are connected to the 4th junction point d, and the reverse input end of the 4th junction point d and the first operational amplifier connects. Second end of the first feedback resistance R8 with the outfan of the first operational amplifier be connected. First end of the second input resistance R11 and second is penetrated and is connected with the outfan of follower 122, second end of the second input resistance R11 and first end of the first feedback resistance R8 are connected to the 5th junction point e, the reverse input end of the 5th junction point e and the first operational amplifier connects, and the 4th junction point d and the five junction point e is connected. First end and the 3rd of the 3rd input resistance R13 is penetrated and is connected with the outfan of follower 132, and second end of the 3rd input resistance R13 and the 5th junction point e connect. First end of balancing resistance R14 and the positive input of the first operational amplifier connect, the second end ground connection of balancing resistance R14.
In the present embodiment, the first in-phase proportion operational amplification circuit 31 may particularly include: the 7th resistance R1, the 8th resistance R3, the 9th resistance R4, the tenth resistance R6, the second feedback resistance R2, the second operational amplifier. Wherein, the first end ground connection of the 7th resistance R1, second end of the 7th resistance R1 and first end of the second feedback resistance R2 are connected to the 6th junction point f, the reverse input end of the 6th junction point f and the second operational amplifier connects, and second end of the second feedback resistance R2 and the outfan of the second operational amplifier connect. First end of the 8th resistance R3 and first is penetrated and is connected with the outfan of follower 112, first end of the 9th resistance R4 and the outfan of the first operational amplifier connect, second end of the 8th resistance R3 and second end of the 9th resistance R4 are connected to the 7th junction point g, and the positive input of the 7th junction point g and the second operational amplifier connects. The first end ground connection of the tenth resistance R6, second end of the tenth resistance R6 and the 7th junction point g connect.
Second in-phase proportion operational amplification circuit 32 may particularly include: the 11st resistance R15, the 12nd resistance R17, the 13rd resistance R19, the 14th resistance R22, the 3rd feedback resistance R16, the 3rd operational amplifier. The first end ground connection of the 11st resistance R15, second end of the 11st resistance R15 and first end of the 3rd feedback resistance R16 are connected to the 8th junction point h, and the reverse input end of the 8th junction point h and the three operational amplifier connects. Second end of the 3rd feedback resistance R16 and the outfan of the 3rd operational amplifier connect. First end of the 12nd resistance R17 and second is penetrated and is connected with the outfan of follower 122, and first end of the 13rd resistance R19 and the outfan of the first operational amplifier connect. Second end of the 12nd resistance R17 and second end of the 13rd resistance R19 are connected to the 9th junction point i, and the positive input of the 9th junction point i and the three operational amplifier connects. The first end ground connection of the 14th resistance R22, second end of the 14th resistance R22 and the 9th junction point i connect.
3rd in-phase proportion operational amplification circuit 33 may particularly include: the 15th resistance R24, the 16th resistance R32, the 17th resistance R31, the 18th resistance R29, the 4th feedback resistance R25, four-operational amplifier. Wherein, the first end ground connection of the 15th resistance R24, second end of the 15th resistance R24 and first end of the 4th feedback resistance R25 are connected to the tenth junction point j, and the reverse input end of the tenth junction point j and four-operational amplifier connects. Second end of the 4th feedback resistance R25 and the outfan of four-operational amplifier connect. First end and the 3rd of the 16th resistance R32 is penetrated and is connected with the outfan of follower 132, first end of the 17th resistance R31 and the outfan of the first operational amplifier connect, second end of the 16th resistance R32 and second end of the 17th resistance R31 are connected to the 11st junction point k, and the positive input of the 11st junction point k and four-operational amplifier connects. The first end ground connection of the 18th resistance R29, second end of the 18th resistance R29 and the 11st junction point k connect.
Specifically, first penetrate with follower 112 output voltage signal be V1, second penetrate with follower 122 output voltage signal be V2,3rd penetrate with follower 132 output voltage signal be V3, these three voltage signals V1, V2, V3 through anti-phase proportion operational amplifier 2 calculate after draw voltage signal V4. Wherein, exchange input A phase voltage sampled signal A-SAMP is calculated through the first in-phase proportion operational amplification circuit 31 after V1 and V4 Signal averaging. Exchange input B phase voltage sampled signal B-SAMP is calculated through the second in-phase proportion operational amplification circuit 32 after V2 and V4 Signal averaging. Exchange input C phase voltage sampled signal C-SAMP is calculated through the 3rd in-phase proportion operational amplification circuit 33 after V3 and V4 Signal averaging. When three-phase input voltage balances, V4 signal is ideally zero point. When three-phase input voltage imbalance, V4 signal is not zero a little, and now A phase input voltage sampled signal A-SAMP is compensated by the calculating of V1 and V4. B phase input voltage sampled signal B-SAMP is compensated by the calculating of V2 and V4. C phase input voltage sampled signal C-SAMP is compensated by the calculating of V3 and V4, thus drawing three-phase input voltage sampled signal through circuit compensation, the input of this sample circuit with domestic three-phase three-wire system power factor correction module is connected, the output voltage making domestic three-phase three-wire system power factor correction module can match with the Communication power equipment of external three-phase three-wire system, power for external three-phase three-wire system Communication power equipment, make this Communication power equipment normal operation.
Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit; Although this utility model being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of this utility model.
Claims (5)
1. a three-phase three-wire system voltage sampling circuit, it is characterized in that, including: the first sampling voltage reduction module, the second sampling voltage reduction module, the 3rd sampling voltage reduction module, anti-phase scale operation amplifying circuit, the first in-phase proportion operational amplification circuit, the second in-phase proportion operational amplification circuit, the 3rd in-phase proportion operational amplification circuit;
The input of described first sampling voltage reduction module is connected with the first-phase of the three-phase output end of external electrical network, the outfan of described first sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described first in-phase proportion operational amplification circuit;
The input of described second sampling voltage reduction module is connected with the second-phase of the three-phase output end of external electrical network, the outfan of described second sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described second in-phase proportion operational amplification circuit;
The input of described 3rd sampling voltage reduction module is connected with the third phase of the three-phase output end of external electrical network, the outfan of described 3rd sampling voltage reduction module is connected with the input of described anti-phase scale operation amplifying circuit, and the outfan of described anti-phase scale operation amplifying circuit is connected with the input of described 3rd in-phase proportion operational amplification circuit.
2. three-phase three-wire system voltage sampling circuit according to claim 1, it is characterised in that described first sampling voltage reduction module includes: the first sampling reduction voltage circuit, first penetrate with follower; The input of described first sampling reduction voltage circuit is connected with the first-phase of the three-phase output end of described external electrical network, the outfan of described first sampling reduction voltage circuit is penetrated with described first and is connected with the input of follower, and described first penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit;
Described second sampling voltage reduction module includes: the second sampling reduction voltage circuit, second penetrate with follower; The input of described second sampling reduction voltage circuit is connected with the second-phase of the three-phase output end of described external electrical network, the outfan of described second sampling reduction voltage circuit is penetrated with described second and is connected with the input of follower, and described second penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit;
Described 3rd sampling voltage reduction module includes: the 3rd sampling reduction voltage circuit, the 3rd penetrate with follower; The input of described 3rd sampling reduction voltage circuit is connected with the third phase of the three-phase output end of described external electrical network, the outfan of described 3rd sampling reduction voltage circuit is penetrated with the described 3rd and is connected with the input of follower, and the described 3rd penetrates the outfan with follower is connected with the input of described anti-phase scale operation amplifying circuit.
3. three-phase three-wire system voltage sampling circuit according to claim 2, it is characterised in that described first sampling reduction voltage circuit includes the first resistance, the second resistance; First end of described first resistance is connected with the first-phase of the three-phase output end of described external electrical network, first end of the second end of described first resistance and described second resistance is connected to the first junction point, second end ground connection of described second resistance, described first junction point is penetrated with described first and is connected with the input of follower;
Described second sampling reduction voltage circuit includes the 3rd resistance, the 4th resistance; Described first end of the 3rd resistance is connected with the second-phase of the three-phase output end of described external electrical network, second end of described 3rd resistance and the first end of described 4th resistance are connected to the second junction point, second end ground connection of described 4th resistance, described second junction point is penetrated with described second and is connected with the input of follower;
Described 3rd sampling reduction voltage circuit includes the 5th resistance, the 6th resistance; Described first end of the 5th resistance is connected with the third phase of the three-phase output end of described external electrical network, second end of described 5th resistance and the first end of described 6th resistance are connected to the 3rd junction point, second end ground connection of described 6th resistance, described 3rd junction point is penetrated with the described 3rd and is connected with the input of follower.
4. the three-phase three-wire system voltage sampling circuit according to Claims 2 or 3, it is characterized in that, described anti-phase scale operation amplifying circuit includes: the first input resistance, the second input resistance, the 3rd input resistance, the first feedback resistance, balancing resistance, the first operational amplifier;
First end of described first input resistance is penetrated with described first and is connected with the outfan of follower, first end of the second end of described first input resistance and described first feedback resistance is connected to the 4th junction point, and described 4th junction point is connected with the reverse input end of described first operational amplifier; Second end of described first feedback resistance is connected with the outfan of described first operational amplifier;
First end of described second input resistance is penetrated with described second and is connected with the outfan of follower, first end of the second end of described second input resistance and described first feedback resistance is connected to the 5th junction point, described 5th junction point is connected with the reverse input end of described first operational amplifier, and described 4th junction point is connected with described 5th junction point;
First end of described 3rd input resistance is penetrated with the described 3rd and is connected with the outfan of follower, and the second end of described 3rd input resistance is connected with described 5th junction point;
First end of described balancing resistance is connected with the positive input of described first operational amplifier, the second end ground connection of described balancing resistance.
5. three-phase three-wire system voltage sampling circuit according to claim 4, it is characterised in that described first in-phase proportion operational amplification circuit includes: the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second feedback resistance, the second operational amplifier; First end ground connection of described 7th resistance, second end of described 7th resistance and the first end of described second feedback resistance are connected to the 6th junction point, described 6th junction point is connected with the reverse input end of described second operational amplifier, and the second end of described second feedback resistance is connected with the outfan of described second operational amplifier; First end of described 8th resistance is penetrated with described first and is connected with the outfan of follower, first end of described 9th resistance is connected with the outfan of described first operational amplifier, second end of described 8th resistance and the second end of described 9th resistance are connected to the 7th junction point, and described 7th junction point is connected with the positive input of described second operational amplifier; First end ground connection of described tenth resistance, the second end of described tenth resistance is connected with described 7th junction point;
Described second in-phase proportion operational amplification circuit includes: the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 3rd feedback resistance, the 3rd operational amplifier; First end ground connection of described 11st resistance, second end of described 11st resistance and the first end of described 3rd feedback resistance are connected to the 8th junction point, described 8th junction point is connected with the reverse input end of described 3rd operational amplifier, and the second end of described 3rd feedback resistance is connected with the outfan of described 3rd operational amplifier; First end of described 12nd resistance is penetrated with described second and is connected with the outfan of follower, first end of described 13rd resistance is connected with the outfan of described first operational amplifier, second end of described 12nd resistance and the second end of described 13rd resistance are connected to the 9th junction point, and described 9th junction point is connected with the positive input of described 3rd operational amplifier; First end ground connection of described 14th resistance, the second end of described 14th resistance is connected with described 9th junction point;
Described 3rd in-phase proportion operational amplification circuit includes: the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 4th feedback resistance, four-operational amplifier; First end ground connection of described 15th resistance, second end of described 15th resistance and the first end of described 4th feedback resistance are connected to the tenth junction point, described tenth junction point is connected with the reverse input end of described four-operational amplifier, and described second end of the 4th feedback resistance is connected with the outfan of described four-operational amplifier; First end of described 16th resistance is penetrated with the described 3rd and is connected with the outfan of follower, first end of described 17th resistance is connected with the outfan of described first operational amplifier, second end of described 16th resistance and the second end of described 17th resistance are connected to the 11st junction point, described 11st junction point is connected with the positive input of described four-operational amplifier, first end ground connection of described 18th resistance, the second end of described 18th resistance is connected with described 11st junction point.
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| CN201521110198.5U CN205280802U (en) | 2015-12-28 | 2015-12-28 | Three phase three wire system voltage sampling circuit |
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| CN201521110198.5U CN205280802U (en) | 2015-12-28 | 2015-12-28 | Three phase three wire system voltage sampling circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556734A (en) * | 2017-01-25 | 2017-04-05 | 苏州振湖电炉有限公司 | Induction coil voltage sampling electronic voltage transducer |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
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2015
- 2015-12-28 CN CN201521110198.5U patent/CN205280802U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556734A (en) * | 2017-01-25 | 2017-04-05 | 苏州振湖电炉有限公司 | Induction coil voltage sampling electronic voltage transducer |
| CN106556734B (en) * | 2017-01-25 | 2023-06-27 | 苏州振湖电炉有限公司 | Electronic voltage sensor for voltage sampling of induction coil |
| CN110333384A (en) * | 2019-08-15 | 2019-10-15 | 杭州电子科技大学 | Three-phase alternating voltage high-precision quick detection circuit based on mutual inductor |
| CN110333384B (en) * | 2019-08-15 | 2021-04-13 | 杭州电子科技大学 | Three-phase alternating current voltage high-precision rapid detection circuit based on mutual inductor |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
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