CN104485730B - Take over seamlessly the circuit of power supply - Google Patents
Take over seamlessly the circuit of power supply Download PDFInfo
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- CN104485730B CN104485730B CN201410714777.4A CN201410714777A CN104485730B CN 104485730 B CN104485730 B CN 104485730B CN 201410714777 A CN201410714777 A CN 201410714777A CN 104485730 B CN104485730 B CN 104485730B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a kind of circuit for taking over seamlessly power supply.Wherein, the circuit for taking over seamlessly power supply includes：First load；First power supply, for the power supply as the first load；Second source, for the first back-up power source as the first power supply；And power supply switching part, it is connected between the first power supply and the first load, and be connected between second source and the first load, wherein, between first power supply and the first load in an ON state, open-circuit condition is between second source and the first load, power supply switching part is used to control to be switched to by on-state between the first power supply and the first load switches to on-state between open-circuit condition, and second source and the first load by open-circuit condition.By the present invention, the problem of voltage, current break and load have a power failure in short-term can be produced by solving power supply handoff procedure in correlation technique.
Description
Technical field
The present invention relates to field of power, in particular to a kind of circuit for taking over seamlessly power supply.
Background technology
In operation of power networks, often to carry out the adjustment of load and redistribute, now need to carry out switch switching (
Lock) operation.Electric load skewness needs to carry out load switching when weighing, and such as low-voltage three-phase load is uneven, transformer bay
It is load unbalanced.An effective way for solving imbalance problem is down cutting load, solves to fall to cut three-phase during three-phase imbalance
Load makes it tend to balance, when solving different transformer loads inequalities, and adjusting different transformer institutes on-load makes it mutually balance.
At present, a kind of mode for switching switching is " cold " switching, i.e., first with the power supply for switching off load, then with new
Power supply powered to load.This switching mode is simple to operate, but can cause the power failure in short-term of load.Fallen in " cold " switching mode
When lock is operated, if using switch is switched fast, power-off time can be foreshortened to a few tens of milliseconds, but in handoff procedure, still
The discontinuous situation of voltage, current waveform occurs.When solving the problems, such as low voltage three-phase, the mode of " cold " switching can only be taken,
Short term outage can inevitably occur in handoff procedure in user.A kind of common " heat " switching method is, in double mothers
When line is powered, close bus and carry out Loop Closing Operation so that the equipotential of two buses, then operated by equipotential, will
Circuit switching is then turned off mother, circuit switching to new bussed supply to needing on new bus.
Either still " heat " switches for " cold " switching, needs to disconnect load current when switching off operation, is closed in switch
Both sides have relative alternating voltage during closing operation, i.e., in power supply handoff procedure, can produce voltage, current break.Operated
Electric arc in journey will consume arc-extinguishing medium and reduce life-span of switch contact, and cyclization dash current can also be produced to power network and equipment
Some negative effects.
For power supply handoff procedure in correlation technique, the problem of voltage, current break and load have a power failure in short-term can be produced,
Not yet propose effective solution at present.
The content of the invention
It is a primary object of the present invention to provide a kind of circuit for taking over seamlessly power supply, cut with solving circuit in correlation technique
Process is changed, the problem of voltage, current break and load have a power failure in short-term can be produced.
To achieve these goals, according to an aspect of the invention, there is provided a kind of circuit for taking over seamlessly power supply.Should
Circuit can include：First load；First power supply, for the power supply as the first load；Second source, for being used as
First back-up power source of one power supply；And power supply switching part, it is connected between the first power supply and the first load, and connection
Between second source and the first load, wherein, between the first power supply and the first load in an ON state, second source and the
Open-circuit condition is between one load, power supply switching part is used to control to be cut by on-state between the first power supply and the first load
It is changed between open-circuit condition, and second source and the first load and on-state is switched to by open-circuit condition.
Further, power supply switching part includes：First switch group, is connected between the first power supply and the first load, and
It is connected between second source and the first load, is path or open circuit between being loaded for the first power supply of control and first, and
It is path or open circuit to control between second source and the first load；Second switch group, with input and output end, input
It is connected with the first power supply, and is connected with second source；And current transformer, it is connected to the defeated of the first load and second switch group
Go out between end, wherein, second switch group is used to control between the first power supply and current transformer to be path or open circuit, and control the
It is path or open circuit between two power supplys and current transformer.
Further, in ac power supply system, current transformer is indirect AC convertor；Or in DC power-supply system
In, current transformer is dc-dc converter.
Further, first switch group includes：One one switch, is connected between the first power supply and the first load；First
Two switches, are connected between second source and the first load, and/or second switch group includes：2nd 1 switch, is connected to first
Between power supply and current transformer；Two or two switch, is connected between second source and current transformer.
Further, power supply switching is carried out in the following manner：By open-circuit condition between second source and the first load
When switching to on-state, increase the power output of current transformer and reduce the power output of the first power supply, and in the first power supply
Power output when being decreased to zero, open-circuit condition is switched to by on-state between the first power supply and the first load.
Further, when the power output of the first power supply is decreased to zero, by connecting between the first power supply and the first load
State is switched to after open-circuit condition, and it is identical with the output voltage of second source that current transformer first adjusts the output voltage of itself, then
Second source connection first is loaded, current transformer locking and exited afterwards.
Further, the first power supply is the first bus power supply, and second source is the second bus power supply；Or first power supply and
Second source is any one in following power supply：A phases power supply, B phases power supply and C phase power supplys, and the first power supply and the second electricity
Source is not with phase power supply.
Further, taking over seamlessly the circuit of power supply also includes：Second load；First power supply is additionally operable to as the second load
Power supply；Second source is additionally operable to the first back-up power source as the second load；And power supply switching part also connects
It is connected between the first power supply and the second load, and is connected between second source and the second load, for the confession loaded second
Power supply switches power supply to second source by first.
Further, power supply switching part includes：3rd switches set, is connected between the first power supply and the second load, and
It is connected between second source and the second load, for being path or open circuit between the first power supply of control and the second load, with
And it is path or open circuit to control between second source and the second load.
Further, taking over seamlessly the circuit of power supply also includes：3rd power supply, for negative as the first load or second
The second back-up power source carried.
By the present invention, using the first load；First power supply, for the power supply as the first load；Second source,
For the first back-up power source as the first power supply；And power supply switching part, it is connected to the first power supply and the first load
Between, and be connected between second source and the first load, wherein, between the first power supply and the first load in an ON state,
Open-circuit condition is between second source and the first load, power supply switching part is used to control between the first power supply and the first load
Switched to by on-state and on-state is switched to by open-circuit condition between open-circuit condition, and second source and the first load, solved
Power supply handoff procedure in correlation technique of having determined, can produce the problem of voltage, current break and load have a power failure in short-term, reach
In power supply handoff procedure, the mutation of electric current, voltage is prevented, so that load can be complete in the case of uninterrupted power supply
The effect taken over seamlessly into power supply.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of the circuit for taking over seamlessly power supply according to embodiments of the present invention；
Fig. 2 is the schematic diagram of the preferred circuit for taking over seamlessly power supply according to embodiments of the present invention；And
Fig. 3 is the schematic diagram of another preferred circuit for taking over seamlessly power supply according to embodiments of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In order that those skilled in the art more fully understand application scheme, below in conjunction with the embodiment of the present application
Accompanying drawing, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application part, rather than whole embodiments.Based on the embodiment in the application, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of the application protection
Enclose.
It should be noted that term " first " in the description and claims of this application and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments herein described herein.In addition, term " comprising " and " tool
Have " and their any deformation, it is intended that covering is non-exclusive to be included, for example, containing series of steps or unit
Process, method, system, product or equipment are not necessarily limited to those steps clearly listed or unit, but may include without clear
It is listing to Chu or for the intrinsic other steps of these processes, method, product or equipment or unit.
Embodiments in accordance with the present invention are used for electric load not there is provided a kind of circuit for taking over seamlessly power supply, the circuit
Power supply switching when.
Fig. 1 is the schematic diagram of the circuit for taking over seamlessly power supply according to embodiments of the present invention.As shown in figure 1, the circuit can
With including：First load K1, the first power supply 10, second source 20 and power supply switching part 30.
First load K1 can be powered by the first power supply 10 or second source 20.Due in electric load skewness weighing apparatus
When, it is necessary to be switched over to the power supply of load.And during switching power supply, power supply switching part 30 can be prevented
Circuit produces voltage jump, current break and load and had a power failure in short-term, so as to realize taking over seamlessly for power supply.For example,
Transformer bay is load unbalanced, power supply switching part 30 can by first load K1 power supply by old power supply power switching extremely
New power is powered, herein, and old power supply can be the first power supply 10, and new power can be second source 20.
First power supply 10 is used as the first load K1 power supply.Wherein, the first power supply 10 can be exchange
Power supply, for example, it can be ac bus power supply.When implementing, the first power supply 10 can be used as the first original confession for loading K1
Power supply, and when the first power supply 10 breaks down, or when the load of the first power supply 10 is too high, K1 can be loaded by first
Power supply other back-up power sources are switched to by the first power supply 10.
For example, second source 20 is used as the first back-up power source of the first power supply 10.Wherein, second source
20 can also be AC power, for example, it can be ac bus power supply.When implementing, if the first power supply 10 breaks down
When, or when the load of the first power supply 10 is too high, the first load K1 power supply can be switched to by the first power supply 10
Second source 20.
Power supply switching part 30 is connected between the first power supply 10 and the first load K1, and is connected to second source 20 and the
Between one load K1, for first load K1 power supply to be switched into second source 20 by the first power supply 10.Wherein, power supply
Switching part 30 can have the combination of devices such as the switch and converter of power supply switching effect to form.Wherein, the He of the first power supply 10
Between first load K1 in an ON state, open-circuit condition, power supply switching part are between the load of second source 20 and first K1
Part 30 is used to control to switch to open-circuit condition, and the He of second source 20 by on-state between the first power supply 10 and the first load K1
On-state is switched to by open-circuit condition between first load K1.
It should be noted that in embodiments of the present invention, power supply switching part 30 can be negative by first in the following manner
The power supply for carrying K1 switches to second source 20 by the first power supply 10：
Need to indicate in advance, direct power supply described below is that power supply connects its load form by switch, wire
Power supply, the middle transform part without electric energy；Indirect power supply is power supply by powering load again after transformation of electrical energy link, such as
The form that power supply passes through electronic power convertor powering load." connection " described below describes the shape directly powered
Formula.
During beginning, the first load K1 is connected to the first power supply 10, and the first 10 pair first of power supply load K1 directly powers；It
Afterwards, the first load K1 is powered simultaneously by the first power supply 10 and second source 20, wherein the first power supply is direct power-supplying forms, second
Power supply 20 is indirect power-supplying forms；Now gradually increase the power output of second source 20, reduce the output work of the first power supply 10
Rate, until being zero；The first power supply 10 is disconnected again, and now, the first load K1 is only by power supply switching part 30 by second source 20
Vertical power supply indirectly；Amplitude, the phase and frequency of the output voltage of regulation power supply switching part 30, are allowed to and the phase of second source 20
Together；Afterwards, the first load K1 is connected to second source 20, and the first load K1 is directly powered by second source 20.Cut in each
During changing, if due to the operation of closure switch, then the voltage magnitude of switch both sides, phase, frequency are identical, in the wink of combined floodgate
Between, the dash current flowed through is almost nil；If disconnecting the operation of switch, then the electric current that disjunction preceding switch flows through is almost nil,
Therefore so that all switching manipulations are all without having voltage jump, current break in whole power supply handoff procedure, therefore drop significantly
Low requirement of the handoff procedure to load current and arc extinguishing, and the service life of power supply switching part 30 is substantially prolongs, it is real
Taking over seamlessly between two asynchronous power supplies is showed, and power failure is not resulted in handoff procedure.
According to embodiments of the present invention, the first power supply 10, the load of the first 10 pair first of power supply are connected to by the first load K1
K1 directly powers；Afterwards, the first load K1 is powered simultaneously by the first power supply 10 and second source 20, wherein the first power supply is direct
Power-supplying forms, second source 20 is indirect power-supplying forms；Now gradually increase the power output of second source 20, reduce the first electricity
The power output in source 10, until being zero；The first power supply 10 is disconnected again, and now, the first load K1 passes through power supply by second source 20
The independent power supply indirectly of switching part 30；Amplitude, the phase and frequency of the output voltage of regulation power supply switching part 30, are allowed to and the
Two power supplys 20 are identical；Afterwards, the first load K1 is connected to second source 20, and the first load K1 is directly powered by second source 20.
The mutation of voltage, electric current will not be produced in Switching power, has reached that the first load K1 can be complete in the case of uninterrupted power supply
The effect taken over seamlessly into power supply.
It should be noted that in embodiments of the present invention, power supply switching can be carried out in the following manner：In second source
And first between load when switching to on-state by open-circuit condition, increase the power output of current transformer and reduce the first power supply
Power output, and when the power output of the first power supply is decreased to zero, by on-state between the first power supply and the first load
Switch to open-circuit condition.Wherein, when the power output of the first power supply is decreased to zero, by connecing between the first power supply and the first load
Logical state is switched to after open-circuit condition, and it is identical with the output voltage of second source that current transformer first adjusts the output voltage of itself,
Second source connection first is loaded again, current transformer locking and exited afterwards.
Preferably, in embodiments of the present invention, as shown in Figure 2,3, aforementioned power source switching part can include：First switch
Group S10, second switch group S20 and current transformer 301.
First switch group S10 is connected between the first power supply 10 and the first load K1, and is connected to second source 20 and the
It is path or open circuit for controlling between the first power supply 10 and the first load K1, and control second source between one load K1
20 and first load K1 between be path or open circuit；Second switch group S20 has input and output end, input and first
Power supply 10 is connected, and is connected with second source；And current transformer 301 is connected to the first load K1 and second switch group S20
Output end between, wherein, second switch group S20 is used to control between the first power supply 10 and current transformer 301 for path or disconnected
It is path or open circuit between road, and control second source 20 and current transformer 301, current transformer 301 can be used for regulation conveying
To the first load K1 power.
The power supply provided because the first power supply 10 can be the first bus for the first load K1, second source 20 can be the
The power supply that two buses provide for the first load K1, therefore first switch group S10 can be connected to the first bus and the first load
Between K1, and it is connected between the second bus and the first load K1.First power supply 10 connects first and loads K1, then the first power supply 10
Powered for the first load K1, disconnection is then stopped power supply；Second source connects first and loads K1, then second source 20 is the first load
K1 is powered, and disconnection is then stopped power supply.
Current transformer 301 is connected between the first load K1 and second switch group S20, and current transformer 301 is the voltage of output, frequency
The electrical equipment that rate, phase and other electricity or characteristic can change.First power supply 10 is being switched into second source 20
When, make its rectification inversion grid connection again by accessing current transformer 301 first, now the first load K1 is by the electricity of current transformer 301 and first
Source 10 is powered simultaneously, increases the output current of current transformer 301, and the electric current of the first power supply 10 is cut near zero, now disconnects the first electricity
Source 10, the first load K1 is independently-powered by current transformer 301, gradually changes the phase, amplitude, frequency of the output alternating current of current transformer 301
Rate, makes it identical with the phase, amplitude, frequency of second source 20, closes power supply of the second source 20 in first switch group 10
Switch, is then log out the power supply of current transformer 301, and the first load K1 is individually powered by second source 20.
According to embodiments of the present invention, the first power supply 10 is switched to by second source 20 by current transformer 301, due in switching
During the first load K1 after the power supply 10 of current transformer 301 and first is powered simultaneously, increase the power output of current transformer 301, subtract
The power output of small first power supply 10 connects second source 20 to zero, exits current transformer 301, first the second electricity of load K1 connections
Source 20 powers, therefore will not produce the mutation of voltage, electric current in Switching power, has reached that load can be in uninterrupted power supply feelings
The effect that power supply takes over seamlessly is completed under condition.
Preferably, in embodiments of the present invention, foregoing current transformer 301 can be：Become in AC system for AC-DC-AC
Flow in device, DC power-supply system is dc-dc converter.
Preferably, in embodiments of the present invention, power supply switching can be carried out in the following manner：In second source 20 and
Between one load K1 when being switched to by open-circuit condition by 301 on-state of current transformer, increase current transformer 301 power output and
Reduce the power output of the first power supply 10, and when the power output of the first power supply 10 is decreased to zero, the first power supply 10 and
Open-circuit condition is switched to by on-state between one load K1.
Preferably, in embodiments of the present invention, when the power output of the first power supply 10 is decreased to zero, the He of the first power supply 10
Between first load K1 after on-state switches to open-circuit condition, current transformer 301 first adjusts the output voltage and the of itself
The output voltage of two power supplys 20 is identical, then second source 20 is connected into the first load K1, and the locking of current transformer 301 afterwards is simultaneously exited.
As shown in Fig. 2 first switch group S10 groups S10 can include：S101 and switch S102 are switched, switch S101 is used for
The first power supply 10 is controlled to connect or disconnect the first load K1；Switch S102 is used to control second source 20 to connect or disconnect the
One load K1.Wherein, second switch group group S20 can include：S201 and switch S202 are switched, switch S201 is used to control first
Power supply 10 connects or disconnects current transformer 301；Switch S202 is used to control second source 20 to connect or disconnect current transformer 301.
Preferably, in embodiments of the present invention, first switch group S10 groups S10 can be single knife switch group, can include：
One one switch, is connected between the first power supply 10 and the first load K1；One or two switch, is connected to second source 20 and first
Between load K1, and/or, second switch group group S20 can be single knife switch group, can include：2nd 1 switch, is connected to the
Between one power supply 10 and current transformer 301；Two or two switch, is connected between second source 20 and current transformer 301.
First switch group S10 groups S10 can be single-pole double-throw switch (SPDT), and when it is thrown onto the first power supply 10, the one one opens
Close and close, i.e. the first power supply 10 and the first load K1 connections；When it is thrown on second source 20, the one or two switch closure, i.e.,
Second source 20 and first loads K1 connections.Second switch group S20 can be single-pole double-throw switch (SPDT) for single knife switch, when it throws
When on to the first power supply 10, the 2nd 1 switch closure, i.e., the first power supply 10 and current transformer 301 are connected；When it throws second source
When on 20, the two or two switch closure, i.e. second source 20 and current transformer 301 is connected.
Preferably, in embodiments of the present invention, the first power supply 10 can be the first bus power supply, and second source 20 can be
Second bus power supply；Or first power supply 10 and second source 20 be any one in following power supply：A phases power supply, B phases electricity
Source and C phase power supplys, and the first power supply is not with phase power supply with second source.
Preferably, in embodiments of the present invention, the foregoing circuit for taking over seamlessly power supply can also include：Second load K2.
Here it is right in the first power supply 10,30 couple of second load K2 of second source 20 and power supply switching part effect and previous embodiment
First load K1's is identical, will not be repeated here.
Preferably, in embodiments of the present invention, power supply switching part 30 can include：3rd switches set S30, current transformer
301 and the 4th switch S40.
3rd switches set S30 is connected between the first power supply 10 and the second load K2, and is connected to second source 20 and the
Between two load K2, for controlling the first power supply 10 to connect or disconnect the second load K2, and control second source 20 is connected
Or disconnect the second load K2.
Current transformer 301 is connected between the second load K2 and second source 20, is delivered to the second load K2's for adjusting
Power.
4th switch S40 is connected between the load of current transformer 301 and second K2.As shown in Fig. 2 the 4th switch S40 can be with
Including：Switch S401 and switch S402, switch S401 can be used for first load K1 be connected, switch S402 can be used for
Second load K2 is connected.
As shown in Fig. 2 the first load K1 works in the first bus, switch S201 closures, switch S202 disconnects, switch
S101, switch S102, switch S401, switch S402 are off, and it is female that the first load K1 switches to second by the first bus
Line is powered, can switching circuit with the following method when actually implementing：
Close a switch S202, start current transformer 301, adjust the output voltage of current transformer 301, make its phase, amplitude, frequency with
First busbar voltage is identical；Closed a switch S401, and the first load K1 is powered simultaneously by the first bus and current transformer 301；Increase becomes
Flow the electric current of device 301 to export, the electric current flowed through on reduction switch S101 to zero；Switch S101 is disconnected, the first load K1 is by current transformer
301 is independently-powered；The voltage magnitude of the inductance L2 output ends of change current transformer 301, phase, frequency, make itself and the second bus electricity
Pressure amplitude value, phase, frequency are identical, close S102, afterwards locking current transformer 301, disconnect S401, S202, here, the first load K1
Turn independently-powered by the second bus；That is the first load K1 the second bus is switched to by the first bus independently-powered, switchings
Operation is completed.It is independently-powered to the first load K1 is switched into the first bus by the second bus, then the S201 that can close a switch,
S401, the first load K1 is powered simultaneously by the second bus and current transformer 301；When the second bussed supply electric current is zero, disconnect
S102, afterwards, the voltage magnitude of regulation current transformer S301 outputs, phase, frequency so that identical with a bus close S101, it
Locking unsteady flow 301, disconnects S401, S201 afterwards, and current transformer 301 exits power supply, and the first load K1 is independently-powered by the first bus, cuts
Change completion.
Due to the second load K2 taking over seamlessly between first, second bus can be completed by same flow, because
This will not be repeated here.
In addition, the flexibility of active power between first, second bus can be realized using the circuit for originally taking over seamlessly power supply
Exchange, the output power between the bus of dynamic regulation first, second.Concrete condition is：Closure switch S102, switch S401, open
S201 is closed, then current transformer two ends connect first, second bus respectively, now may operate in different mode, realize first, second
Power flexible switching between bus.
According to embodiments of the present invention, due to taking over seamlessly between first, second bus will not produce voltage, electric current it is prominent
Become, therefore reached that load can complete the effect that power supply takes over seamlessly in the case of uninterrupted power supply.
Fig. 3 is the schematic diagram of another preferred circuit for taking over seamlessly power supply according to embodiments of the present invention.Such as Fig. 3 institutes
Show：
S103 closures are switched, other are switched off, the first load K1 works in A phases, switching target is to load K1 by first
B phases are switched to by A phases to power, can switching circuit with the following method when actually implementing：Close a switch S204, starts unsteady flow
Device 301, adjusts the output voltage of current transformer 301, makes its phase, amplitude, frequency identical with A phase voltages；Close a switch S40, and first
Load K1 is powered simultaneously by current transformer 301 and switch S103；Increase the power output of current transformer 301, reduce switch S103 upper
The electric current crossed is to zero；Disconnect switch S103, the first load K1 independently-powered by current transformer 301；Change the inductance in current transformer 301
The voltage magnitude and phase of L2 output ends, are close to B phase voltages amplitude and phase；Close switch S104, locking current transformer
301, switch S40 and switch S204 are disconnected, current transformer 301 exits power supply, now the first load K1 is independently-powered by B phases, switching
Complete.Can complete to power between any two-phase of A, B, C three-phase in the same way takes over seamlessly.
Preferably, in embodiments of the present invention, the circuit for taking over seamlessly power supply can also include：3rd power supply.3rd
Power supply is used for the second back-up power source as the first load or the second load.
In this example, S203, S204, S205 can collectively constitute a threephase switch, and current transformer is connected respectively, this time-varying
Stream device friendship-straight conversion section is completed by the way of three phase rectifier.
With foregoing inventive embodiments, the power flexible that the circuit for taking over seamlessly power supply can be also completed between two-phase is exchanged.
According to embodiments of the present invention, because taking over seamlessly between two-phase will not produce the mutation of voltage, electric current, therefore reach
It can complete to take over seamlessly the effect of power supply phase in the case of uninterrupted power supply to load.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
1. a kind of circuit for taking over seamlessly power supply, it is characterised in that including：
First load；
First power supply, for the power supply as the described first load；
Second source, for the first back-up power source as first power supply；And
Power supply switching part, be connected to first power supply and it is described first load between, and be connected to the second source and
Between first load, wherein, between first power supply and first load in an ON state, the second source
Open-circuit condition is between first load, the power supply switching part is used to control first power supply and described first
Switched to and cut between open-circuit condition, and the second source and first load by open-circuit condition by on-state between load
It is changed to on-state,
Wherein, the power supply switching part includes：
First switch group, is connected between first power supply and first load, and be connected to the second source and institute
State between the first load, be path or open circuit for controlling between first power supply and first load, and control institute
It is path or open circuit to state between second source and first load；
Second switch group, with input and output end, the input is connected with first power supply, and with described second
Power supply is connected；And
Current transformer, is connected between first load and the output end of the second switch group, wherein, described second opens
Pass group is used to control between first power supply and the current transformer to be path or open circuit, and control the second source and
It is path or open circuit between the current transformer,
Wherein, power supply switching is carried out in the following manner：
When switching to on-state by open-circuit condition between the second source and first load, increase the current transformer
Power output and reduce the power output of first power supply, and be decreased to zero in the power output of first power supply
When, open-circuit condition is switched to by on-state between first power supply and first load,
Wherein, when the power output of first power supply is decreased to zero, first power supply and it is described first load between by
On-state is switched to after open-circuit condition, and the current transformer first adjusts the output of the output voltage of itself and the second source
Voltage is identical, then by second source connection first load, the current transformer locking and exits afterwards.
2. the circuit according to claim 1 for taking over seamlessly power supply, it is characterised in that
In ac power supply system, the current transformer is indirect AC convertor；Or
In DC power-supply system, the current transformer is dc-dc converter.
3. the circuit according to claim 1 for taking over seamlessly power supply, it is characterised in that
The first switch group includes：One one switch, is connected between first power supply and first load；One or two
Switch, is connected between the second source and first load, and/or
The second switch group includes：2nd 1 switch, is connected between first power supply and the current transformer；Two or two opens
Close, be connected between the second source and the current transformer.
4. the circuit according to claim 1 for taking over seamlessly power supply, it is characterised in that
First power supply is the first bus power supply, and the second source is the second bus power supply；Or
First power supply and the second source are any one in following power supply：A phases power supply, B phases power supply and C phases electricity
Source, and first power supply is not with phase power supply with the second source.
5. the circuit according to claim 1 for taking over seamlessly power supply, it is characterised in that the circuit for taking over seamlessly power supply
Also include：
Second load；
First power supply is additionally operable to the power supply as the described second load；
The second source is additionally operable to the first back-up power source as the described second load；And
The power supply switching part is additionally attached between first power supply and second load, and is connected to second electricity
Between source and second load, for second power supply loaded to be switched power supply into described second by described first
Power supply.
6. the circuit according to claim 5 for taking over seamlessly power supply, it is characterised in that the power supply switching part includes：
3rd switches set, is connected between first power supply and second load, and be connected to the second source and institute
State between the second load, be path or open circuit for controlling between first power supply and second load, and control
It is path or open circuit between the second source and second load.
7. the circuit according to claim 6 for taking over seamlessly power supply, it is characterised in that the circuit for taking over seamlessly power supply
Also include：
3rd power supply, for the second back-up power source as the described first load or second load.
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| CN201410714777.4A CN104485730B (en) | 2014-11-28 | 2014-11-28 | Take over seamlessly the circuit of power supply |
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| CN201410714777.4A CN104485730B (en) | 2014-11-28 | 2014-11-28 | Take over seamlessly the circuit of power supply |
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| CN108110748A (en) * | 2017-12-19 | 2018-06-01 | 北京卫星制造厂 | A kind of access of direct current grid-connecting apparatus and exit control circuit and method |
| CN111193318A (en) * | 2020-02-17 | 2020-05-22 | 北京中清智辉能源科技有限公司 | Power supply switching device and power supply system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203504280U (en) * | 2013-09-16 | 2014-03-26 | 福建省力得自动化设备有限公司 | Direct current power supply under-voltage automatic switching system based on microprocessor power supply monitor |
| CN104158283A (en) * | 2014-08-01 | 2014-11-19 | 科立讯通信股份有限公司 | Circuit and method for realizing smooth switching of main stand-by power source of communication equipment |
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| US7459804B2 (en) * | 2004-02-10 | 2008-12-02 | Liebert Corporation | Static transfer switch device and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203504280U (en) * | 2013-09-16 | 2014-03-26 | 福建省力得自动化设备有限公司 | Direct current power supply under-voltage automatic switching system based on microprocessor power supply monitor |
| CN104158283A (en) * | 2014-08-01 | 2014-11-19 | 科立讯通信股份有限公司 | Circuit and method for realizing smooth switching of main stand-by power source of communication equipment |
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