CN101252270A - Circuit for preventing phase of three-phase power supply from unbalance - Google Patents
Circuit for preventing phase of three-phase power supply from unbalance Download PDFInfo
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- CN101252270A CN101252270A CNA2007101535579A CN200710153557A CN101252270A CN 101252270 A CN101252270 A CN 101252270A CN A2007101535579 A CNA2007101535579 A CN A2007101535579A CN 200710153557 A CN200710153557 A CN 200710153557A CN 101252270 A CN101252270 A CN 101252270A
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- phase
- zero crossing
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- electric power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to an unbalanced preventing circuit for a tri-phase power source. The purpose is solving the problem of unbalanced phases by using R, S, T phases to supply the power orderly instead of using N phase and another phase to supply power while using the tri-phase power source driving single phase load. Thereby, the unbalanced preventing circuit of the invention comprises: a zero nodical detecting potion for detecting the tri-phase power source; a power control relay for controlling the power supply and cutting based on the zero nodical moment of the detected phases; and a control potion for controlling the switching action of the power control relay by receiving the zero nodical signals of the phases.
Description
Technical field
The present invention relates to a kind of each that takes place when preventing to adopt three phase mains to drive single-phase load mutually the imbalance mutually of the three phase mains of uneven (imbalance) phenomenon prevent circuit.
Background technology
Recently, along with the develop rapidly of analog-and digital-technology, the electronic product that possesses most advanced and sophisticated function spreads to each family and office space fast.
The increase of this electronic product causes electrification to increase, especially as have the building of a plurality of separated spaces (such as, school, company or hospital) system air conditioner that generally uses, on one or more off-premises stations, connect a plurality of indoor sets, so power consumption is very big with different shape and volume.
In order to adopt three phase mains to the bigger electronic product supply electric power of power consumption such as these system air conditioners, this is because compare with single phase poaer supply, and the pulsation of three phase mains is littler and can supply more electric power.
Three phase mains is that amplitude and three sine-wave currents that have 120 degree phase differences identical with frequency flow through three-phase (R, S, T) respectively, and general use will be converged the N of intermediate point of three-phase (R, S, T) as shown in Figure 1 as the three-phase four-wire system mode of connection of earth connection.
Three-phase four-wire system power supply as shown in Figure 1, voltage is 380V between R-S, S-T except that earth connection (N phase), the T-R phase, with earth connection (N phase) is benchmark, among R, S, the T three-phase one with N mutually between, being that supply voltage between N-R, N-S, the N-T is 220V, is can be in single-phase and the shared mode of connection of threephase load.
This three-phase four-wire system power supply is connected in electronic product (to be specially, when the off-premises station of system air conditioner) using, as shown in Figure 2, R, S, the supply of T three-phase are used for the electric power of Driven Compressor 1, and N mutually and among R, S, the T three-phase supplies the electric power that is used to drive single phase fan motor 3 mutually.
At this moment, the electric current that flows through R, S, T, N phase respectively is
S=T=Ic (driven compressor electric current)
N=If (fan electromotor drive current)
R=If+Ic (fan electromotor drive current+driven compressor electric current), thus the electric current that flows through the R phase is greater than the electric current that flows through S, T phase.
As mentioned above, (be specially when adopting three phase mains to drive single-phase load, fan electromotor) time, as shown in Figure 3, flow through the current waveform distortion (distortion) of each phase and supply unbalanced electric power mutually to each, and if take place uneven mutually, even consume same current, the power consumption when power consumption also can be greater than balance.
For example, the power loss that takes place under following two kinds of situations.
Suppose that 1. the three-phase current sum of number circuit is 150A, wherein, the electric current of R, S, each phase of T is respectively 25A, 50A, 75A and takes place uneven mutually, suppose that 2. the three-phase current sum of number circuit is 150A, wherein, the electric current of R, S, each phase of T is respectively 50A and imbalance mutually takes place, though the total electricity that use this moment is identical, and power loss (PL=I
2* R) difference.
If 1., 2. wire thicknesses is identical in number circuit, then because the resistance (R) of electric wire is identical, therefore 1. the power loss of number circuit (PL1) is PL1=25
2+ 50
2+ 75
2=8750 (W), and 2. the power loss of number circuit (PL2) is PL2=50
2+ 50
2+ 50
2=7500 (W), hence one can see that when each is uneven mutually, and power loss increases about 16%.
And, in the system that uses threephase loads such as compressor 1 or fan electromotor 3, if produce uneven mutually, three phase rotating field disequilibrium and become the reason of noise or bearing wear then.
Summary of the invention
Therefore, the present invention is devoted to solve above-mentioned existing issue, the object of the present invention is to provide a kind of when adopting three phase mains to drive single-phase load, supply electric power successively rather than only supply electric power mutually with another one mutually by N by R, S, three phases of T, the imbalance mutually of the three phase mains of the problem of uneven (imbalance) prevents circuit thereby can solve mutually.
To achieve these goals, the imbalance mutually of three phase mains provided by the present invention prevents that circuit from comprising: the zero crossing test section that detects each phase zero crossing (zero-crossing) of three phase mains; With detected each phase zero crossing is benchmark constantly, controls the electric power control relay of each phase supply of electric power and cut-out; And receive described each phase zero crossing signal and control the control part of described electric power control with the switch motion of relay.
And the uneven mutually of described three phase mains prevents that circuit is characterised in that described three phase mains is a three-phase four-wire system 380V power supply.
And described three phase mains uneven mutually prevents that circuit is characterised in that described three phase mains unevenly mutually prevents that circuit is arranged on the connection single-phase load of three-phase four-wire system power supply and in the system that drives.
And described zero crossing test section comprises R, the S that is used to detect described three phase mains, three zero crossing testing circuits of each phase zero crossing of T.
And described zero crossing testing circuit comprises photoelectrical coupler, and described photoelectrical coupler comprises: positive pole and the light-emitting diode that R, S, T respectively are connected and negative pole is connected with N are used for moving according to the electric current that flows through described R, S, each phase of T; Phototransistor is used for action according to described light-emitting diode and is switched on/disconnects and each phase zero crossing signal is input to described control part.
And the control of described electric power comprises three solid-state relays (Solid State Relay) with relay, and each the phase zero crossing that is used for detecting with described three zero crossing testing circuits is benchmark constantly, to the single-phase load supply with cut off each electric power mutually of R, S, T.
And described three solid-state relays are switched on successively/disconnect constantly and supply the electric power of R, S, each phase of T to described single-phase load at described each phase zero crossing.
And described control part is carried out described three solid-state relays of on/off successively according to each the phase zero crossing signal that detects from described three zero crossing testing circuits, to be used for supplying R, S, each phase electric power of T successively to described single-phase load.
Description of drawings
Fig. 1 is the figure that each voltage between phases of general three-phase four-wire system power supply is shown;
Fig. 2 is the structure chart that the system air conditioner of the three-phase four-wire system power supply that adopts Fig. 1 is shown for example;
Fig. 3 is the phase unsymmetrical current oscillogram that takes place when adopting the three-phase four-wire system power drives single-phase load of Fig. 1;
The imbalance mutually of the three phase mains that Fig. 4 is according to an exemplary embodiment of the present to be provided prevents circuit diagram;
Fig. 5 is the signal output waveform figure by zero crossing test section of the present invention;
Fig. 6 is the control timing figure that uses relay according to the electric power control of zero crossing signal of the present invention;
Fig. 7 is the ultimate current oscillogram that is fed to single-phase load of the present invention.
Main symbol description:
10,12,14-zero crossing test section, 10a, 12a, 14a-photoelectrical coupler, 20-single-phase load, 30,32, the control of 34-electric power relay, 40-control part
Embodiment
Below, describe embodiments of the invention in detail with reference to accompanying drawing.
Uneven (imbalance) mutually of the three phase mains that Fig. 4 is according to an exemplary embodiment of the present to be provided prevents circuit diagram, and this circuit comprises: three the zero crossing test sections (10,12,14) that detect the zero crossing (zero-crossing) of R, S, T three-phase respectively; Each the phase zero crossing that is detected with described three zero crossing test sections (10,12,14) is benchmark constantly, to single-phase load 20 supply with cut off R, S, T each mutually three electric power controls of electric power with relays (30,32,34); And receive each phase that described three zero crossing test sections (10,12,14) are detected the zero crossing signal and successively described three electric power control of on/off with the control part 40 of relays (30,32,34).
Described first to the 3rd zero crossing test section (10,12,14) comprising: detect R, S, each phase zero crossing of T photoelectrical coupler (10a, 12a, 14a) constantly; Current-limiting resistance (R1, R2), (R3, R4), (R5, R6); And on draw (pull-up) resistance R 7, R8, R9.
Described photoelectrical coupler (10a, 12a, 14a) comprising: light-emitting diode (10b, 12b, 14b), this light-emitting diode positive pole is that media is connected to R, S, each phase of T with current-limiting resistance (R1, R2), (R3, R4), (R5, R6), and negative pole is connected to N mutually and luminous; Phototransistor (10c, 12c, 14c), action according to described light-emitting diode (10b, 12b, 14b) is switched on/disconnects, thus with the zero crossing of each phase constantly (zero-potential point) be input to R, S, the T phase input port (P1, P2, P3) of control part 40.
The control of described electric power is that zero crossing with each phase is that benchmark takes turns doing solid-state relay (the Solid State Relay that on/off is moved constantly with relay (30,32,34), SSR), reception is each phase supply of electric power signal that benchmark is exported successively from R, S, the T phase output terminal mouth (O1, O2, O3) of described control part 40 with each phase zero crossing constantly, thereby control power supply is to supply or to cut off R, S, T phase power supply successively to single-phase load 20.
And described electric power control is gone up with relay (30,32,34) and is connected pull-up resistor R10, R11, the R12 that is connected with stabilized voltage power supply (Vcc:5V).
Described control part 40 is to receive each phase zero crossing signal that described three zero crossing test sections (10,12,14) are detected and successively to the microcomputer of described single-phase load 20 supply R, S, each phase electric power of T, and with each phase zero crossing is that benchmark is to described electric power control relay (30,32,34) output power suppling signal, so that described three electric power control relay (30,32,34) on/off successively constantly.
Below, the imbalance mutually of describing aforesaid three phase mains prevents the running and the action effect of circuit.
Originally, be in off-state with relay (30,32,34), so R, S, each phase of T do not have the electric current supply owing to be connected to the electric power control of R, S, each phase of T.Simultaneously, three the zero crossing test sections (10,12,14) that are connected to each phase are gone up the sine wave that input has 120 degree phase differences.At this moment, when the sine wave that is input to each phase passed through described three zero crossing test sections (10,12,14), described zero crossing test section (10,12,14) was linked into the light-emitting diode (10b, 12b, 14b) of photoelectrical coupler (10a, 12a, 14a) with it after limiting the sine-wave current composition that is input to each phase by current-limiting resistance (R1, R2), (R3, R4), (R5, R6).
Light-emitting diode (10b, 12b, 14b) sends light when electric current flow into described light-emitting diode (10b, 12b, 14b), and the light that is sent is connected phototransistor (10c, 12c, 14c) makes phototransistor (10c, 12c, 14c) have electric current to flow from collector electrode to emitter.When described phototransistor (10c, 12c, 14c) when being switched on, the collector electrode of each phototransistor (10c, 12c, 14c) is because its voltage of ground connection becomes 0V (promptly, low level), thus the input port of the R of control part 40, S, T phase (P1, P2, P3) in the input low level signal.
On the contrary, when described light-emitting diode (10b, 12b, 14b) not during inflow current light-emitting diode (10b, 12b, 14b) not luminous, phototransistor this moment (10c, 12c, 14c) is kept off-state, because the collector electrode of phototransistor (10c, 12c, 14c) is connected to stabilized voltage power supply (Vcc), therefore voltage be 5V (promptly, high level), thus input high level signal in the R of control part 40, S, the T phase input port (P1, P2, P3).
By these operations, the exportable zero crossing signal waveform as shown in Figure 5 of zero crossing test section (10,12,14), the R of control part 40, S, T phase input port (P1, P2, P3) receive this zero crossing signal and according to as shown in Figure 6 order successively the supply of electric power signal is outputed to the electric power control that respectively is connected and successively on/off electric power control with relay (30,32,34) with relay (30,32,34).
When the control of described electric power with relay (30,32,34) be switched on successively/when disconnecting, R, S, T three-phase be alternate supplies electric power and the electric power that balances each other to single-phase load 20 supply successively, thereby as shown in Figure 7, therefore the final electric current that balances each other to described single-phase load 20 supplies and only solving in the past by N mutually and a certain specific mutually unbalanced problem that takes place when supplying electric power mutually and driving single-phase load 20 can suppress that power consumption increases and the raising reliability of products.
In sum, according to three phase mains provided by the present invention mutually imbalance prevent circuit, when connecting single-phase 220V load at three-phase four-wire system 380V power supply and drive this load, supply electric power successively rather than supply electric power permanently by R, S, T three-phase, thereby solved mutually unbalanced problem by N phase and another one.
Claims (8)
1, a kind of imbalance mutually of three phase mains prevents circuit, and this circuit comprises:
Detect the zero crossing test section of each phase zero crossing of three phase mains;
With detected each phase zero crossing is benchmark constantly, controls the electric power control relay of the supply of electric power and the cut-out of each phase; And
The zero crossing signal that receives described each phase is controlled the control part of described electric power control with the switch motion of relay.
2, the imbalance mutually of three phase mains as claimed in claim 1 prevents circuit, it is characterized in that described three phase mains is a three-phase four-wire system 380V power supply.
3, the imbalance mutually of three phase mains as claimed in claim 1 prevents circuit, and what it is characterized in that described three phase mains unevenly mutually prevents that circuit is arranged on that the three-phase four-wire system power supply connects three-phase and single-phase load and in the system that drives.
4, the imbalance mutually of three phase mains as claimed in claim 1 prevents circuit, it is characterized in that described zero crossing test section comprises R, the S that is used to detect described three phase mains, three zero crossing testing circuits of each phase zero crossing of T.
5, the imbalance mutually of three phase mains as claimed in claim 4 prevents circuit, it is characterized in that described zero crossing testing circuit comprises photoelectrical coupler, this photoelectrical coupler comprises: positive pole and the light-emitting diode that R, S, T respectively are connected and negative pole is connected with N are used for moving according to the electric current that flows through described R, S, each phase of T; Phototransistor is used for action according to described light-emitting diode and is switched on/disconnects and each phase zero crossing signal is input to described control part.
6, the imbalance mutually of three phase mains as claimed in claim 4 prevents circuit, it is characterized in that described electric power control comprises three solid-state relays with relay, each the phase zero crossing that is used for being detected with described three zero crossing testing circuits is benchmark constantly, to the single-phase load supply with cut off each electric power mutually of R, S, T.
7, the imbalance mutually of three phase mains as claimed in claim 6 prevents circuit, it is characterized in that described three solid-state relays are switched on successively/disconnect constantly and supply the electric power of R, S, each phase of T to described individual event load successively at the zero crossing of described each phase.
8, the imbalance mutually of three phase mains as claimed in claim 6 prevents circuit, it is characterized in that described control part is according to each phase zero crossing signal that detects from described three zero crossing testing circuits described three solid-state relays of on/off successively, to be used for supplying R, S, each phase electric power of T successively to described single-phase load.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070017003A KR101116681B1 (en) | 2007-02-20 | 2007-02-20 | A prevention circuit imbalance of phase in three phase power supply |
| KR10-2007-0017003 | 2007-02-20 | ||
| KR1020070017003 | 2007-02-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101252270A true CN101252270A (en) | 2008-08-27 |
| CN101252270B CN101252270B (en) | 2011-11-09 |
Family
ID=39783265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101535579A Expired - Fee Related CN101252270B (en) | 2007-02-20 | 2007-09-21 | Circuit for preventing phase of three-phase power supply from unbalance |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2008206384A (en) |
| KR (1) | KR101116681B1 (en) |
| CN (1) | CN101252270B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118895A (en) * | 2010-12-03 | 2011-07-06 | 李旭亮 | LED streetlight direct current (DC) power supply line structure and method for reconstructing streetlight power supply line |
| DE102011087280A1 (en) * | 2011-11-29 | 2013-05-29 | BSH Bosch und Siemens Hausgeräte GmbH | A system of networked home appliances having a common time base and a recognizer of a respective phase of building installation, and methods of operating such a system |
| CN102623947B (en) * | 2012-03-29 | 2015-09-23 | 临安亿安电力电子科技有限公司 | A kind of earth leakage protective device with phase line handoff functionality |
| DE102015000076A1 (en) * | 2015-01-12 | 2016-07-14 | Rwe Deutschland Ag | Method for operating an electrical consumer or generator on a subscriber network and a device and a switching matrix |
| CN104852398B (en) * | 2015-06-09 | 2017-03-29 | 河南博通电力技术有限公司 | Three-phase imbalance and low-voltage controlling device, system and compensation loop operation/cutting method |
| CN108365619A (en) * | 2018-05-03 | 2018-08-03 | 广东电网有限责任公司 | Three-phase unbalanced phase-changing device |
| CN110098625B (en) * | 2019-05-13 | 2020-10-30 | 武汉武新电气科技股份有限公司 | Seamless switching commutation device and method |
| CN117277858A (en) * | 2023-10-19 | 2023-12-22 | 江苏科曜能源科技有限公司 | Three-phase three-level four-bridge arm energy storage inverter and inverter system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002247758A (en) * | 2001-02-21 | 2002-08-30 | Mitsubishi Rayon Co Ltd | Triac control device |
| JP2003087977A (en) * | 2001-09-10 | 2003-03-20 | Fuji Photo Film Co Ltd | Load connection controller and photograph processing system |
| CN100349353C (en) * | 2002-04-05 | 2007-11-14 | 清华大学 | Method for compensating dynamic three-phase imbalance load and compensator |
| CN2643540Y (en) * | 2003-05-12 | 2004-09-22 | 亚太电效系统(珠海)有限公司 | Three-phase electric power electricity saver |
-
2007
- 2007-02-20 KR KR1020070017003A patent/KR101116681B1/en active IP Right Grant
- 2007-09-07 JP JP2007232767A patent/JP2008206384A/en active Pending
- 2007-09-21 CN CN2007101535579A patent/CN101252270B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR101116681B1 (en) | 2012-03-08 |
| JP2008206384A (en) | 2008-09-04 |
| CN101252270B (en) | 2011-11-09 |
| KR20080077453A (en) | 2008-08-25 |
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Granted publication date: 20111109 Termination date: 20190921 |