CN201478869U

CN201478869U - Parallel online circuit capable of achieving UPS zero-circulating current

Info

Publication number: CN201478869U
Application number: CN2009201938733U
Authority: CN
Inventors: 巫良生; 陈文全; 林火土
Original assignee: Xiamen Protek Technology Co Ltd
Current assignee: Avic Tech Xiamen Electric Power Technology Co ltd; Avic Tech Xiamen Electronics Co ltd
Priority date: 2009-08-28
Filing date: 2009-08-28
Publication date: 2010-05-19
Anticipated expiration: 2019-08-28

Abstract

The utility model relates to the field of an uninterruptible power supply (UPS), in particular to the parallel online application of the UPS. The parallel online circuit capable of achieving the UPS zero-circulating current is characterized in that based on the original stand-alone UPS, a parallel line, a plurality of connecting cables, a thyristor or an IGBT, and an isolation transformer are added, and a parallel control unit circuit is internally added; and the parallel control unit is mainly responsible for ensuring the synchronization of two machines, i.e. the same frequency and phase output, and responsible for the triggering and conduction logic of an SCR1, an SCR2 and an SCR3 of the UPS so as to achieve the zero-circulating current parallel system control. The control circuit is simple, does not need complicated current and voltage equalizing and active and reactive current calculation and feedback control circuits, and an anti-reverse charge circuit and other various protection circuits, accordingly, the number of public circuits can be effectively reduced, the reliability is greatly improved, and the utility model has the advantages of zero circulation, ultra isolation, easy achievement of balanced power output and the like, and the machine is not exploded and the like even if the parallel line falls off.

Description

Realize the in parallel online circuit of UPS nullring stream

Technical field

The utility model relates to the uninterrupted power supply (ups) Unity field, relates in particular to the on-line Application in parallel of UPS.

Background technology

Uninterrupted power supply (ups) Unity is a kind of constant frequency, voltage stabilizing, pure, continual high quality power supply, and along with the extensive use of the high speed development and the computer of information technology, it has become the indispensable supply unit of many important events.The generation that UPS can once prevent to cut off the power supply is if can't avoid outage to take place but UPS damages.Therefore need the on-line Application in parallel of UPS to carry out second protection.The standby system in parallel of UPS then is applied to even more important occasion, requires higher reliability; How improving UPS backup in parallel reliability is the research and development emphasis of each company unit; At present domestic and international employing technology all is an output mode directly in parallel, and it must satisfy the control requirement of with the frequency homophase, all pressing current-sharing and various logic like this; Increase a lot of controls and protective circuit again on the basis of original unit; wherein include a lot of public partial circuits; can interact between them; such as wherein one current sample unusual or mistake in computation or communication abnormality etc. appear; will cause that this machine circulation is excessive or other is unusual; protection even aircraft bombing etc. then can appear; simultaneously also can make another operation irregularity occur; therefore its failure rate is the relation of adding up; rather than desirable the thinking relation of backuping each other, also be the main cause that at present big multi-vendor parallel UPS failure rate adopts its failure rate of backup in parallel back to go up not down.

The utility model content

Therefore, at the deficiency of prior art, the UPS nullring stream online circuit in parallel that the utility model proposes a kind of advantages of simple more solves.

The technical solution of the utility model is:

The in parallel online circuit of realization UPS nullring stream comprises 2 UPS, and wherein each UPS all has the output channel and the output channel that exchanges input or storage battery input process power converting circuit of standby bypass.Wherein, the output channel of the standby bypass of 2 UPS connects the input side that first electronic switch unit exports isolating transformer to respectively, the output channel of power converting circuit connects the input side that second electronic switch unit exports isolating transformer to respectively, also be connected with the Parallel Control unit on the power converting circuit of each UPS respectively and be provided with the 3rd electronic switch unit, the 3rd electronic switch unit also is connected in the input side of isolating transformer, described Parallel Control unit output control first electronic switch unit, second electronic switch unit, the control utmost point of the 3rd electronic switch unit; Wherein, the Parallel Control unit of the one UPS is connected in the Parallel Control unit of the 2nd UPS by communication cable, the 3rd electronic switch unit of the one UPS is by connect the 3rd electronic switch unit of the 2nd UPS of electric wire cable, the outlet side series connection back output of the outlet side of first isolating transformer and second isolating transformer.

Further, described isolating transformer is 2: 1 isolating transformer.

Further, described electronic switch unit is controllable silicon (SCR).Perhaps, described electronic switch unit is insulated gate bipolar transistor (IGBT).

First electronic switch unit of a described UPS and the 2nd UPS, second electronic switch unit, the output of the 3rd electronic switch unit all is input side coil first ends that are connected in described isolating transformer, the input side coil second end ground connection, the end of the same name of the outlet side coil of first isolating transformer and its input side coil first end is the live wire output, the other end of the outlet side coil of first isolating transformer is series at the outlet side of second isolating transformer and the end of the same name of its input side coil first end, and the different name end of the outlet side coil of second isolating transformer and its input side coil first end is the zero line output.

The output that the utility model adopts is directly in parallel but through the output again that is connected in series after the transformer transformation, it exports direct parallel way, save the control circuit of all pressing current-sharing, this circuit requirement current-sharing is all pressed, the calculating and the FEEDBACK CONTROL of meritorious reactive current, it is many to relate to parts, and exigent real-time is big to original circuit construction variations, construction cycle is just grown like this, and stability can't guarantee; And that the utility model controlling party rule and unit change is little, saves complicated circuit control again, and its failure rate reduces naturally greatly, can not produce circulation again, and therefore more direct scheme in parallel has, reliability height, nullring stream, superly isolate, advantage that current-sharing is good; It has increased transformer, and cost can rise, but is requiring very important events to have high high praise to be worth.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.

Consulting shown in Figure 1 is an embodiment of the in parallel online circuit of realization UPS nullring stream of the present utility model.Wherein, comprise 2 uninterrupted power supply (ups) Unitys, UPS1 and UPS2, UPS1 be provided with the output channel 121 of standby bypass and exchange input 1221 or storage battery input 1222 through the output channels 122 of power converting circuits (AC/DC translation circuit 131 and DC/AC translation circuit 132), UPS2 is provided with the output channel 221 of standby bypass and exchanges input 2221 or storage battery is imported the output channels 222 of 2222 process power converting circuits (AC/DC translation circuit 231 and DC/AC translation circuit 232).Wherein, the output channel 121 of the standby bypass of UPS1 connects the input side that first electronic switch unit 111 exports first isolating transformer 15 to respectively, and the output channel 221 of the standby bypass of UPS2 connects the input side that first electronic switch unit 211 exports second isolating transformer 25 to respectively.The output channel 122 of the power converting circuit of UPS1 connects the input side that second electronic switch unit 112 exports first isolating transformer 15 to respectively, and the output channel 222 of the power converting circuit of UPS2 connects the input side that second electronic switch unit 212 exports second isolating transformer 25 to respectively.Also be connected with

Parallel Control unit

133 and 233 and establish the 3rd

electronic switch unit

113 and 213 are arranged respectively on the power converting circuit of UPS1 and UPS2 respectively, the 3rd electronic switch unit 113 of UPS1 also is connected in the input side of first isolating transformer 15, and the 3rd electronic switch unit 213 of UPS2 also is connected in the input side of second isolating transformer 25.The control utmost point 141,142,143 of Parallel Control unit 133 outputs, 134 controls first electronic switch unit 111 of UPS1, second electronic switch unit 112, the 3rd electronic switch unit 113, the control utmost point 241,242,243 of Parallel Control unit 233 outputs, 234 controls first electronic switch unit 211 of UPS2, second electronic switch unit 212, the 3rd electronic switch unit 213.Wherein, the Parallel Control unit 133 of UPS1 is connected in the Parallel Control unit 233 of UPS2 by communication cable, is used for the transfer of data of parallel operation control.The 3rd electronic switch unit 113 of UPS1 is by the 3rd electronic switch unit 213 (A-A line) of electric wire cable series connection UPS2, and export the outlet side series connection back of the outlet side of first isolating transformer 15 and second isolating transformer 25.

Concrete, the output of first electronic switch unit 111 of UPS1, second electronic switch unit 112, the 3rd electronic switch unit 113 all is to be connected in the input side coil of first isolating transformer 15 first end 151, input side coil second end 152 ground connection, the output of first electronic switch unit 211 of UPS2, second electronic switch unit 212, the 3rd electronic switch unit 213 all is to be connected in the input side coil of second isolating transformer 25 first end 251, input side coil second end 252 ground connection.The end of the same name 153 of the outlet side coil of first isolating transformer 15 and its input side coil first end 151 is a live wire L output, the other end 154 of 15 outlet side coils of first isolating transformer is series at the outlet side coil of end of the same name 253, the second isolating transformers 25 of the outlet side of second isolating transformer 25 and its input side coil first end 251 and the different name end 254 of its input side coil first end 251 is a zero line N output.

Described first isolating transformer 15 and second isolating transformer 25 are the isolating transformer of 2:1, are responsible for the output of 1/2 voltage, realize load sharing, nullring stream, the super purpose of isolating by it.

Described electronic switch unit is controllable silicon (SCR).Perhaps, described electronic switch unit is insulated gate bipolar transistor (IGBT).Insulated gate bipolar transistor IGBT (Insulated Gate BipolarTransistor), by the compound full-control type voltage driven type power semiconductor that BJT (double pole triode) and MOS (insulating gate type field effect tube) form, have the advantage of low conduction voltage drop two aspects of the high input impedance of MOSFET and GTR concurrently.

The utility model is a Synchronization Control in parallel and to the logic control of SCR.It is responsible for realizing that two machines are with homophase requirement frequently synchronous control unit.The relation of the control of SCR: SCR1 and SCR2 right and wrong, the then SCR1 of two machines shutoff when SCR2 opens, then two bypass is all necessary when promptly having one to switch to the inversion attitude turn-offs; The SCR3 condition of closing is when having only two all to switch to the inversion attitude, and other all is open-minded.Parallel operation line: realize the transmission of above control signal.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.

Claims

1. realize the in parallel online circuit of UPS nullring stream, comprise 2 UPS, wherein each UPS all has the output channel and the output channel that exchanges input or storage battery input process power converting circuit of standby bypass, it is characterized in that: the output channel of the standby bypass of 2 UPS connects the input side that first electronic switch unit exports isolating transformer to respectively, the output channel of power converting circuit connects the input side that second electronic switch unit exports isolating transformer to respectively, also be connected with the Parallel Control unit on the power converting circuit of each UPS respectively and be provided with the 3rd electronic switch unit, the 3rd electronic switch unit also is connected in the input side of isolating transformer, described Parallel Control unit output control first electronic switch unit, second electronic switch unit, the control utmost point of the 3rd electronic switch unit; Wherein, the Parallel Control unit of the one UPS is connected in the Parallel Control unit of the 2nd UPS by communication cable, the 3rd electronic switch unit of the one UPS is by connect the 3rd electronic switch unit of the 2nd UPS of electric wire cable, the outlet side series connection back output of the outlet side of first isolating transformer and second isolating transformer.

2. the in parallel online circuit of realization UPS nullring stream according to claim 1, it is characterized in that: described isolating transformer is 2: 1 isolating transformer.

3. the in parallel online circuit of realization UPS nullring stream according to claim 1, it is characterized in that: described electronic switch unit is controllable silicon (SCR).

4. the in parallel online circuit of realization UPS nullring stream according to claim 1, it is characterized in that: described electronic switch unit is insulated gate bipolar transistor (IGBT).

5. the in parallel online circuit of realization UPS nullring stream according to claim 1, it is characterized in that: first electronic switch unit of a described UPS and the 2nd UPS, second electronic switch unit, the output of the 3rd electronic switch unit all is input side coil first ends that are connected in described isolating transformer, the input side coil second end ground connection, the end of the same name of the outlet side coil of first isolating transformer and its input side coil first end is the live wire output, the other end of the outlet side coil of first isolating transformer is series at the outlet side of second isolating transformer and the end of the same name of its input side coil first end, and the different name end of the outlet side coil of second isolating transformer and its input side coil first end is the zero line output.