CN201910638U - Power frequency UPS (uninterrupted power supply) isolating center line circuit - Google Patents
Power frequency UPS (uninterrupted power supply) isolating center line circuit Download PDFInfo
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- CN201910638U CN201910638U CN2010206910309U CN201020691030U CN201910638U CN 201910638 U CN201910638 U CN 201910638U CN 2010206910309 U CN2010206910309 U CN 2010206910309U CN 201020691030 U CN201020691030 U CN 201020691030U CN 201910638 U CN201910638 U CN 201910638U
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Abstract
The utility model relates to the field of uninterrupted power supplies, in particular to a power frequency UPS (uninterrupted power supply) isolating center line circuit, which comprises a transformer and relays RLY1 and RLY2. The transformer is connected with an inversion PWM (pulse-width modulation) device, an N wire of a secondary winding of the transformer is connected with an output N wire, a movable contact of a switch of the relay RLY1 is connected with an output L wire, a normally closed contact of the switch of the relay RLY1 is connected with a bypass L wire, a normally opened contact contact of the switch of the relay RLY1 is connected with a secondary L wire of the transformer, a movable contact of a switch of the relay RLY2 is connected with the output N wire, a normally closed contact of the switch of the relay RLY2 is connected with a bypass N wire, and a normally opened contact of the switch of the relay RLY2 is grounded. The power frequency UPS isolating center line circuit is simple in control and low in cost, and can effectively resolve problems of zero-to-ground voltage, ground system conversion and input and output isolation.
Description
Technical field
The utility model relates to the uninterrupted power supply technical field, relates in particular to the circuit that a kind of power frequency UPS isolates center line.
Background technology
Along with the development that 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 more and more higher requirement to machine room zero ground voltage.
The zero ground voltage of UPS is meant the zero ground voltage that does not additionally 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, input at UPS like this, 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 by rectification and inversion, as everyone knows, power frequency isolating transformer of the inner existence of power frequency UPS, this transformer is absolutely necessary on topology design, transformer is the full-bridge circuit inalienable part, although the design of this transformer is isolated, but in UPS inside, 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 as shown in Figure 1.
The utility model content
The purpose of this utility model is to provide a kind of control simple, with low cost at the deficiencies in the prior art, and 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 purpose of this utility model realizes by 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 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, the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, 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.
The beneficial effects of the utility model are: 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 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, the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, 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, UPS is in opening process, and 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 finish 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, the utility model control is simple, with low cost, 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 the utility model prior art;
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Embodiment 1
As shown in Figure 2, 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 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, the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, 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, 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 finish 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, the utility model control is simple, realization is easy, 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, after finishing 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 after finishing 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 the SCR1 purpose in parallel 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 in parallel 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 the explanation the technical solution of the utility model; but not to the restriction of the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.
Claims (4)
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, the normally opened contact of the switch sections of RLY1 is connected with the secondary L line of transformer, 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 |
|---|---|---|---|
| CN2010206910309U CN201910638U (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (uninterrupted power supply) isolating center line circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206910309U CN201910638U (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (uninterrupted power supply) isolating center line circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201910638U true CN201910638U (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206910309U Expired - Lifetime CN201910638U (en) | 2010-12-30 | 2010-12-30 | Power frequency UPS (uninterrupted power supply) isolating center line circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201910638U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005802A (en) * | 2010-12-30 | 2011-04-06 | 易事特电力系统技术有限公司 | Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit |
-
2010
- 2010-12-30 CN CN2010206910309U patent/CN201910638U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005802A (en) * | 2010-12-30 | 2011-04-06 | 易事特电力系统技术有限公司 | Power frequency UPS (Uninterrupted Power Supply) isolation center line circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110727 Effective date of abandoning: 20120704 |