CN102005802B - Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit - Google Patents
Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit Download PDFInfo
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- CN102005802B CN102005802B CN2010106153407A CN201010615340A CN102005802B CN 102005802 B CN102005802 B CN 102005802B CN 2010106153407 A CN2010106153407 A CN 2010106153407A CN 201010615340 A CN201010615340 A CN 201010615340A CN 102005802 B CN102005802 B CN 102005802B
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Abstract
The invention relates to the field of uninterruptable power supplies, in particular to a power frequency UPS (Uninterrupted Power Supply) isolation center line circuit which comprises a transformer connected with a contravariant PWM (Pulse-Width Modulator), wherein a secondary N wire of the transformer is connected with an output N wire. The power frequency UPS isolation center line circuit also comprises relays RLY 1 and RLY2, wherein a movable contact of the switching part of the RLY1 is connected with an output L wire, a normally closed contact of the switching part of the RLY1 is connected with a bypass L wire, the movable contact of the switching part of the RLY 1 is connected with a secondary L wire of the transformer, a movable contact of the switching part of the RLY2 is connected with the output N wire, a normally closed contact of the switching part of the RLY2 is connected with the bypass N wire, and the movable contact of the switching part of the RLY2 is grounded. The invention has the advantages of simple control and low cost, and can effectively solve the problems of zero to earth voltage, earthed system transformation and input and output isolation.
Description
Technical field
The present invention relates to the uninterrupted power supply technical field, relate in particular to the circuit that a kind of power frequency UPS isolates center line.
Background technology
The development that Along with computer technology is maked rapid progress, the operating voltage of computer-internal chip is more and more lower, and energy consumption is more and more littler.For the server operate as normal needs, the new services device of producers such as IBM, HP proposes increasingly high requirement to machine room zero ground voltage.
The zero ground voltage of UPS is meant the zero ground voltage of not extra increase, promptly refers on the input power distribution cabinet of machine room, and when zero ground voltage is 0V, the zero ground voltage in the output of UPS.If but user's distribution system itself does not just reach requirement; High order harmonic component coupling between neutral line current or line; The capital causes zero line that ground wire is had certain voltage difference; So in input place of UPS, zero ground voltage will raise and not reach equipment requirements, and UPS itself can not settle the matter once and for all.
At present, power frequency UPS generally has two mode of operations, and one is bypass mode, and one is normal line model; Under the bypass mode, with the direct powering load of mode of civil power or sending and receiving motor; Under normal line model, export to electric through transformer again after the double conversion of UPS through rectification and inversion, well-known; Power frequency isolating transformer of the inner existence of power frequency UPS, this transformer is absolutely necessary on topology design, and transformer is the full-bridge circuit inalienable part; Although the design of this transformer is isolated; But inner at UPS, in fact transformer does not isolate, for the output that guarantees UPS produces a N line; Load has complete ac circuit during UPS bypass work simultaneously; The input zero line of power frequency UPS generally all links to each other with the output zero line, and some UPS increases devices such as EMI filtering between input N and output N, but does not isolate.The structure of transformer in main circuit is as shown in Figure 1.
Summary of the invention
The objective of the invention is to be directed against the deficiency of prior art and provide a kind of control simple, with low cost, the power frequency UPS that can effectively solve the problem of zero low-voltage, grounding system transformation, input and output isolation isolates the circuit of center line.
The object of the invention is realized through following technical measures:
A kind of power frequency UPS isolates neutral circuit; Comprise the transformer that is connected with inversion PWM, the secondary N line of transformer is connected with output N line, also comprises relay R LY1, RLY2; The moving contact of the switch sections of RLY1 is connected with output L line; The normally-closed contact of the switch sections of RLY1 is connected with bypass L line, and the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, and the moving contact of the switch sections of RLY2 is connected with output N line; The normally-closed contact of the switch sections of RLY2 is connected with bypass N line, the normally opened contact ground connection of the switch sections of RLY2.
Wherein, also comprise thyristor SCR1, the T1 utmost point of SCR1 is connected with bypass L line, and the T2 utmost point of SCR1 is connected with the moving contact of the switch sections of RLY1, output L line.
Wherein, also comprise thyristor SCR2, the T1 utmost point of SCR2 is connected with bypass N line, and the T2 of SCR2 is connected with the moving contact of the switch sections of output N line, RLY2.
Wherein, the control signal of the control section of the control section of RLY1 and RLY2 is a synchronous control signal.
Beneficial effect of the present invention is: a kind of power frequency UPS isolates neutral circuit, comprises the transformer that is connected with inversion PWM, and the secondary N line of transformer is connected with output N line; Also comprise relay R LY1, RLY2, the moving contact of the switch sections of RLY1 is connected with output L line, and the normally-closed contact of the switch sections of RLY1 is connected with bypass L line; The normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, and the moving contact of the switch sections of RLY2 is connected with output N line, and the normally-closed contact of the switch sections of RLY2 is connected with bypass N line; The normally opened contact ground connection of the switch sections of RLY2, UPS is in opening process, and UPS works in bypass mode; This moment, relay R LY1 and RLY2 worked in normally off, and UPS bypass output is when the UPS operate as normal; RLY1 and RLY2 will move; UPS switches to contravariant transformer output, and the moving contact of RLY1 connects the L line of contravariant transformer, and the moving contact of RLY2 connects the earth or unsettled.After RLY1 and RLY2 completion switching; This moment, output and the input of UPS were just kept apart fully; The connection status of center line during also by bypass mode switches to isolation; Solved the complete isolating problem of input and output under normal mode of operation, it is simple, with low cost that the present invention controls, and can effectively solve the problem of zero low-voltage, grounding system transformation, input and output isolation.
Description of drawings
Fig. 1 is the circuit diagram of prior art of the present invention;
Fig. 2 is a circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment 1
As shown in Figure 2, a kind of power frequency UPS isolates neutral circuit, comprises the transformer that is connected with inversion PWM; The secondary N line of transformer is connected with output N line, also comprises relay R LY1, RLY2, and the moving contact of the switch sections of RLY1 is connected with output L line; The normally-closed contact of the switch sections of RLY1 is connected with bypass L line, and the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, and the moving contact of the switch sections of RLY2 is connected with output N line; The normally-closed contact of the switch sections of RLY2 is connected with bypass N line, the normally opened contact ground connection of the switch sections of RLY2, and UPS is in opening process; UPS works in bypass mode, and this moment, relay R LY1 and RLY2 worked in normally off, UPS bypass output; When the UPS operate as normal, RLY1 and RLY2 will move, and UPS switches to contravariant transformer output; The moving contact of RLY1 connects the L line of contravariant transformer, and the moving contact of RLY2 connects the earth or unsettled.After RLY1 and RLY2 completion switching; This moment, output and the input of UPS were just kept apart fully; The connection status of center line during also by bypass mode switches to isolation, solved the complete isolating problem of input and output under normal mode of operation, and the present invention controls simply, realizes easily; With low cost, can effectively solve the problem of zero low-voltage, grounding system transformation, input and output isolation.
If the moving contact of RLY2 connects the earth, accomplish after switching under normal mode of operation, the N line of transformer output is because of directly isolating ground connection, the zero ground voltage that no matter importing zero ground voltage has how high UPS to export is 0V.
If the moving contact of RLY2 is unsettled; Under the normal mode of operation of accomplishing after switching, the L-N line of output all is suspended states over the ground, can be grounded the transformation of TN-S system of system to IT system; Can be applicable to require the application scenario of neutral point and the earth isolation, such as occasions such as medical treatment.
The control signal of the control section of the RLY1 of present embodiment and the control section of RLY2 is a synchronous control signal.
Present embodiment also comprises thyristor SCR1, and the T1 utmost point of SCR1 is connected with bypass L line, and the T2 utmost point of SCR1 is connected with the moving contact of the switch sections of RLY1, output L line.
It is to solve the matter of time that RLY1 switches that present embodiment connects SCR1 purpose parallelly connected with RLY1, guarantees switching uninterruptedly, and the operating time of SCR1 is very short, mainly be solution RLY1 switching time length problem, the power of the SCR1 of present embodiment is eligible very little.
Embodiment 2
Present embodiment also comprises thyristor SCR2, and the T1 utmost point of SCR2 is connected with bypass N line, and the T2 of SCR2 is connected with the moving contact of the switch sections of output N line, RLY2.
It is to solve the matter of time that RLY2 switches that present embodiment connects the SCR2 purpose parallelly connected with RLY2, guarantees switching uninterrupted.The operating time of SCR2 is very short, mainly is long problem switching time that solves RLY2, and the power of the SCR2 of present embodiment is eligible very little.
The N line is the neutral line in the presents, and L is the circuitry lines of high pressure.
In the presents: the TN-S system is the neutral line in the three-phase four-wire system (N) and the distinct grounding system of protective wire (PE).
IT system is the pattern of grounding system, isolated neutral system.
Should be noted that at last; Above embodiment is only in order to explain technical scheme of the present invention; But not to the restriction of protection range of the present invention, although with reference to preferred embodiment the present invention has been done explanation at length, those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the essence and the scope of technical scheme of the present invention.
Claims (1)
1. a power frequency UPS isolates neutral circuit; Comprise the transformer that is connected with inversion PWM, the secondary N line of transformer is connected with output N line, it is characterized in that: also comprise relay R LY1, RLY2; The moving contact of the switch sections of RLY1 is connected with output L line; The normally-closed contact of the switch sections of RLY1 is connected with bypass L line, and the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, and the moving contact of the switch sections of RLY2 is connected with output N line; The normally-closed contact of the switch sections of RLY2 is connected with bypass N line, the normally opened contact ground connection of the switch sections of RLY2.
2, a kind of power frequency UPS according to claim 1 isolates neutral circuit, and it is characterized in that: also comprise thyristor SCR1, the T1 utmost point of SCR1 is connected with bypass L line, and the T2 utmost point of SCR1 is connected with the moving contact of the switch sections of RLY1, output L line.
3, a kind of power frequency UPS according to claim 2 isolates neutral circuit, and it is characterized in that: also comprise thyristor SCR2, the T1 utmost point of SCR2 is connected with bypass N line, and the T2 of SCR2 is connected with the moving contact of the switch sections of output N line, RLY2.
4, a kind of power frequency UPS according to claim 3 isolates neutral circuit, and it is characterized in that: the control signal of the control section of RLY1 and the control section of RLY2 is a synchronous control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106153407A CN102005802B (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106153407A CN102005802B (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102005802A CN102005802A (en) | 2011-04-06 |
| CN102005802B true CN102005802B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010106153407A Active CN102005802B (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit |
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| CN (1) | CN102005802B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9337690B2 (en) * | 2012-10-26 | 2016-05-10 | Eaton Corporation | UPS systems and methods using mode-dependent grounding |
| CN103715762A (en) * | 2014-01-09 | 2014-04-09 | 惠州天能源科技有限公司 | Bidirectional switching circuit of hybrid power supply system and control method of bidirectional switching circuit |
| CN106849047A (en) * | 2017-04-21 | 2017-06-13 | 广东浪潮大数据研究有限公司 | A kind of method that N line-to-earth voltages are reduced under UPS battery pattern |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6218744B1 (en) * | 1999-03-22 | 2001-04-17 | Powerware Corporation | Uninterruptible power supply and ferroresonant transformer for use therewith |
| CN201910638U (en) * | 2010-12-30 | 2011-07-27 | 易事特电力系统技术有限公司 | A power frequency UPS isolated neutral circuit |
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Effective date of registration: 20190419 Address after: Room No.1, 99 Huaxia Road, Lujia Town, Kunshan City, Jiangsu Province Patentee after: YISHITE NEW ENERGY (KUNSHAN) Co.,Ltd. Address before: 523808 Easy Power System Technology Co., Ltd. of North Industrial City A, Songshan Lake Science and Technology Industrial Park, Dongguan City, Guangdong Province Patentee before: EAST ELECTRIC SYSTEM TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20240130 Address after: No. 500 Linyang Road, Qidong Economic Development Zone, Nantong City, Jiangsu Province, 226000 (cluster registration) Patentee after: Yishite (Jiangsu) Energy Storage Technology Co.,Ltd. Country or region after: China Address before: Room 1, No. 99 Huaxia Road, Lujia Town, Kunshan City, Suzhou City, Jiangsu Province, 215331 Patentee before: YISHITE NEW ENERGY (KUNSHAN) Co.,Ltd. Country or region before: China |
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