CN107947325A - The power supply selection circuit and power supply unit of a kind of multi input power supply - Google Patents
The power supply selection circuit and power supply unit of a kind of multi input power supply Download PDFInfo
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- CN107947325A CN107947325A CN201711346913.9A CN201711346913A CN107947325A CN 107947325 A CN107947325 A CN 107947325A CN 201711346913 A CN201711346913 A CN 201711346913A CN 107947325 A CN107947325 A CN 107947325A
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- 238000010586 diagram Methods 0.000 description 14
- 238000005457 optimization Methods 0.000 description 11
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The present invention provides a kind of the power supply selection circuit and power supply unit of multi input power supply,When the input terminal voltage of the relatively low switch arrays of input terminal voltage in adjacent switch array is less than predetermined threshold value,Being arranged at the voltage comparison unit in adjacent switch array will control the switch arrays that input terminal voltage is higher in adjacent switch array to turn on,And then provide the input voltage of higher for the high potential input terminal of supply convertor,Until the input terminal voltage of the relatively low switch arrays of input terminal voltage is higher than predetermined threshold value in a pair of of adjacent switch array,Namely the minimum higher than supply convertor,It can then be exported by respective switch array to the high potential input terminal of supply convertor,And then ensure that the input voltage of supply convertor is slightly above its minimum,Avoid in the prior art due to input voltage is high and the problem of cause the transfer efficiency of supply convertor low and of high cost.
Description
Technical field
The present invention relates to power electronics field, the power supply selection circuit of more particularly to a kind of multi input power supply and power supply
Device.
Background technology
In conventional photovoltaic electricity generation system, the MPPT (Maximum of photovoltaic module are usually realized by power optimization device
Power Point Tracking, MPPT maximum power point tracking) control；In order to reduce system cost, power optimization device is usually set
Multiple photovoltaic modulies can be accessed at the same time, its connection mode can use the parallel-connection structure shown in Fig. 1 a or Fig. 1 b, can also adopt
With the cascade structure shown in Fig. 2 a or Fig. 2 b.
For the auxiliary power supply of power optimization device, generally directly from input side draw electricity, then coordinate the supply convertor of rear class,
Such as buck, flyback, are powered with exporting suitable level to power optimization device.In order to improve the performance of power optimization device and reliable
Property, general accessory power supply is designed as the multi input power supply power supply mode that multiple photovoltaic modulies are powered, so when wherein one
Road do not have voltage either power input when such as photovoltaic module be blocked, do not access or under-voltage, other photovoltaic modulies can still be protected
Power optimization device normal work is demonstrate,proved, so that it is guaranteed that the normal power generation of photovoltaic module, improves income.
But the above method is only applicable to parallel-connection structure, and for cascade structure, due to each input power input or
Person's output is not totally one reference ground, is optionally powered so can not realize.A kind of cascade structure exists in the prior art
The method of power supply is powered using full busbar voltage, i.e., directly excellent for power by supply convertor using the total voltage after cascade
Change device power supply, as shown in Figure 3.This method is simple, and when wherein any out of power all the way, the total voltage after cascade can still ensure
Reliable power supply.But, the power supplying efficiency of this method is relatively low, because series-fed input voltage is higher, supply convertor increases
Beneficial very little, corresponding conversion efficiency are low.Also, herein under higher input voltage, the stresses of parts of supply convertor is also higher,
The device of selection high voltage is needed, adds cost.
The content of the invention
The present invention provides a kind of the power supply selection circuit and power supply unit of multi input power supply, with solve in the prior art due to
Input voltage is high and the problem of cause the transfer efficiency of supply convertor low and of high cost.
To achieve the above object, the technical solution that the application provides is as follows：
A kind of power supply selection circuit of multi input power supply, for being supplied for the rear class equipment of M input power under cascade structure
Electric installation provides the input voltage of supply convertor, including：N number of controllable switch arrays and N-1 voltage comparison unit, M and N
It is the positive integer more than 1, and N≤M；Wherein：
Hot end of the input terminal of N number of switch arrays respectively from different input powers is connected；
The output terminal of N number of switch arrays is connected with the high potential input terminal of the supply convertor；
A voltage comparison unit is respectively arranged between adjacent switch array, for when input terminal in adjacent switch array
When the input terminal voltage of the relatively low switch arrays of voltage is less than predetermined threshold value, control input terminal voltage in adjacent switch array higher
Switch arrays conducting；The predetermined threshold value is more than or equal to the minimum of the supply convertor；
The original state of the minimum switch arrays of input terminal voltage is conducting in whole switch arrays；And adjacent switch array
In, when the higher switch arrays of input terminal voltage turn on, reversely cut-off or the shut-off of the relatively low switch arrays of input terminal voltage.
Preferably, the voltage comparison unit includes：First voltage-stabiliser tube, the first triode, first resistor and second resistance；
Wherein：
The input terminal of the anode of first voltage-stabiliser tube switch arrays relatively low with input terminal voltage in adjacent switch array
It is connected；
The cathode of first voltage-stabiliser tube is connected by the first resistor with the base stage of first triode；
The emitter ground connection of first triode；
The collector of first triode is higher by the second resistance and input terminal voltage in adjacent switch array
The input terminals of switch arrays be connected；
The control of the collector of first triode switch arrays higher with input terminal voltage in adjacent switch array
End is connected.
Preferably, the voltage comparison unit includes：3rd resistor, the 4th resistance, the 5th resistance and the second triode；Its
In：
The input terminal phase of one end of 3rd resistor switch arrays relatively low with input terminal voltage in adjacent switch array
Even；
The other end of the 3rd resistor is connected with one end of the 4th resistance and the base stage of second triode；
The other end of 4th resistance and the emitter ground connection of second triode；
The collector of second triode is higher by the 5th resistance and input terminal voltage in adjacent switch array
The input terminals of switch arrays be connected；
The control of the collector of second triode switch arrays higher with input terminal voltage in adjacent switch array
End is connected.
Preferably, the voltage comparison unit includes：Second voltage-stabiliser tube, optocoupler and the 6th resistance；Wherein：
The input terminal of the anode of second voltage-stabiliser tube switch arrays relatively low with input terminal voltage in adjacent switch array
It is connected；
The cathode of second voltage-stabiliser tube is connected with the input terminal of the optocoupler；
The output terminal of the optocoupler passes through the higher switch of input terminal voltage in the 6th resistance and adjacent switch array
The input terminal of array is connected；
The control terminal of the output terminal of the optocoupler switch arrays higher with input terminal voltage in adjacent switch array is connected.
Preferably, the minimum switch arrays of input terminal voltage include in whole switch arrays：First diode；
The highest switch arrays of input terminal voltage include in whole switch arrays：3rd triode, the 7th resistance, the 8th electricity
Resistance, the 3rd voltage-stabiliser tube and first switch pipe；Wherein：
The base stage of 3rd triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 3rd triode；
The collector of 3rd triode passes through the cathode of the 7th resistance and the 3rd voltage-stabiliser tube, the described 8th
The control terminal of one end of resistance and the first switch pipe is connected；
Anode, the other end of the 8th resistance and the input terminal phase of the first switch pipe of 3rd voltage-stabiliser tube
Even, tie point is the input terminal of corresponding switch arrays；
The output terminal of the first switch pipe is the output terminal of corresponding switch arrays；
Rest switch array includes：4th triode, the 9th resistance, the tenth resistance, the 4th voltage-stabiliser tube, second switch pipe and
Second diode；Wherein：
The base stage of 4th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 4th triode；
The collector of 4th triode passes through the cathode of the 9th resistance and the 4th voltage-stabiliser tube, the described tenth
The control terminal of one end of resistance and the second switch pipe is connected；
Anode, the other end of the tenth resistance and the input terminal phase of the second switch pipe of 4th voltage-stabiliser tube
Even, tie point is the input terminal of corresponding switch arrays；
The output terminal of the second switch pipe is connected with the cathode of second diode；
The anode of second diode is the output terminal of corresponding switch arrays.
Preferably, the 3rd triode is replaced with the 3rd switching tube and the 5th voltage-stabiliser tube；5th voltage-stabiliser tube is born
Pole is connected with the control terminal of the 3rd switching tube, the output terminal phase of the cathode and the 3rd switching tube of the 5th voltage-stabiliser tube
Even；
4th triode is replaced with the 4th switching tube and the 6th voltage-stabiliser tube；The anode of 6th voltage-stabiliser tube with it is described
The control terminal of 4th switching tube is connected, and the cathode of the 6th voltage-stabiliser tube is connected with the output terminal of the 4th switching tube.
Preferably, the minimum switch arrays of input terminal voltage include in whole switch arrays：3rd diode；
The highest switch arrays of input terminal voltage include in whole switch arrays：5th triode and the first relay；Its
In：
The base stage of 5th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 5th triode；
The collector of 5th triode is connected with coil one end of first relay；
The coil other end of first relay receives supply voltage；
Normal open switch one end of first relay is the input terminal of corresponding switch arrays；
The normal open switch other end of first relay is the output terminal of corresponding switch arrays；
Rest switch array includes：6th triode, the second relay and the 4th diode；Wherein：
The base stage of 6th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 6th triode；
The collector of 6th triode is connected with coil one end of second relay；
The coil other end of second relay receives the supply voltage；
Normal open switch one end of second relay is the input terminal of corresponding switch arrays；
The normal open switch other end of second relay is connected with the cathode of the 4th diode；
The anode of 4th diode is the output terminal of corresponding switch arrays.
Preferably, the 5th triode is replaced with the 5th switching tube and the 7th voltage-stabiliser tube；7th voltage-stabiliser tube is born
Pole is connected with the control terminal of the 5th switching tube, the output terminal phase of the cathode and the 5th switching tube of the 7th voltage-stabiliser tube
Even；
6th triode is replaced with the 6th switching tube and the 8th voltage-stabiliser tube；The anode of 8th voltage-stabiliser tube with it is described
The control terminal of 6th switching tube is connected, and the cathode of the 8th voltage-stabiliser tube is connected with the output terminal of the 6th switching tube.
A kind of power supply unit of multi input power supply, for the rear class equipment power supply for M input power under cascade structure, institute
Stating the power supply unit of multi input power supply includes：The power supply selection of supply convertor and the multi input power supply as described in any of the above-described
Circuit, M are the positive integer more than 1；Wherein：
The output terminal of the power supply selection circuit is connected with the high potential input terminal of the supply convertor；
The low potential input end grounding of the supply convertor；
The output terminal of the supply convertor is connected with the feeder ear of the rear class equipment.
Preferably, the supply convertor is boosting, decompression or reverse exciting topological.
The power supply selection circuit of multi input power supply provided by the invention, its each voltage comparison unit are used for what voltage compared
Predetermined threshold value is more than or equal to the minimum of supply convertor, when the relatively low switch of input terminal voltage in adjacent switch array
When the input terminal voltage of array is less than predetermined threshold value, the voltage comparison unit being arranged in adjacent switch array will control adjacent open
The higher switch arrays conducting of input terminal voltage in array is closed, and then higher is provided for the high potential input terminal of supply convertor
Input voltage, until the input terminal voltage of the relatively low switch arrays of input terminal voltage is higher than default threshold in a pair of of adjacent switch array
Value, namely the minimum higher than supply convertor, then can be exported by respective switch array to the height of supply convertor
Current potential input terminal, and then ensure that the input voltage of supply convertor is slightly above its minimum, avoid existing skill
The problem of causing the transfer efficiency of supply convertor low and of high cost due to input voltage height in art.
Brief description of the drawings
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the attached drawing in description is only this below
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 a are the schematic diagrames that more photovoltaic modulies that the prior art provides use parallel-connection structure with power optimization device；
Fig. 1 b are the schematic diagrames that more photovoltaic modulies that the prior art provides use another parallel-connection structure with power optimization device；
Fig. 2 a are the schematic diagrames that more photovoltaic modulies that the prior art provides use cascade structure with power optimization device；
Fig. 2 b are the schematic diagrames that more photovoltaic modulies that the prior art provides use another cascade structure with power optimization device；
Fig. 3 is the structure diagram of the power supply unit of power optimization device under the cascade structure that the prior art provides；
Fig. 4 is the structure diagram of the power supply unit of multi input power supply provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of the power supply unit of multi input power supply provided in an embodiment of the present invention；
Fig. 6 is the structure diagram of the power supply unit of multi input power supply provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of the power supply unit for the multi input power supply that another embodiment of the present invention provides；
Fig. 8 a are the structure diagrams for the voltage comparison unit that another embodiment of the present invention provides；
Fig. 8 b are another structure diagrams for the voltage comparison unit that another embodiment of the present invention provides；
Fig. 9 a are another structure diagrams of the power supply unit for the multi input power supply that another embodiment of the present invention provides；
Fig. 9 b are another structure diagrams of the power supply unit for the multi input power supply that another embodiment of the present invention provides；
Fig. 9 c are another structure diagrams of the power supply unit for the multi input power supply that another embodiment of the present invention provides.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, shall fall in the protection scope of this application.
The present invention provides a kind of power supply selection circuit of multi input power supply, to solve in the prior art due to input voltage height
And the problem of causing the transfer efficiency of supply convertor low and of high cost.
Specifically, the power supply selection circuit of the multi input power supply, for being set for the rear class of M input power under cascade structure
Available electric installation provides the input voltage of supply convertor, referring to Fig. 4 to Fig. 6, the power supply selection circuit bag of the multi input power supply
Include：N number of controllable switch arrays (switch arrays 1, switch arrays 2 ... switch arrays N as shown in Fig. 4 to Fig. 6) and N-1
Voltage comparison unit (voltage comparison unit 1, voltage comparison unit 2 ... voltage comparison unit N- as shown in Fig. 4 to Fig. 6
1), M and N is the positive integer more than 1, and N≤M；Wherein：
Hot end of the input terminal of N number of switch arrays respectively from different input powers is connected；
The output terminal of N number of switch arrays is connected with the high potential input terminal of supply convertor；
A voltage comparison unit is respectively arranged between adjacent switch array, for when input terminal in adjacent switch array
When the input terminal voltage of the relatively low switch arrays of voltage is less than predetermined threshold value, control input terminal voltage in adjacent switch array higher
Switch arrays conducting；Predetermined threshold value is more than or equal to the minimum of supply convertor；
The original state of the minimum switch arrays of input terminal voltage is conducting in whole switch arrays；And adjacent switch array
In, when the higher switch arrays of input terminal voltage turn on, reversely cut-off or the shut-off of the relatively low switch arrays of input terminal voltage.
Specifically operation principle is：
Illustrated by taking M=N as an example, referring to Fig. 4, the hot end voltage of each input power be defined as successively V1,
V2 ... VN, each input power are concatenated together successively, and it is O, A, B ... N to define tie point successively from low to high according to potential.Cause
This, the voltage of each node is represented by VAO=V1, VBO=V1+V2, VNO=V1+V2+ ...+VN, and so on.
The corresponding switch arrays of having connected of the output of each node, are followed successively by switch arrays 1, switch arrays 2 ... are opened
Array N is closed, possesses controllable ducting capacity, the high potential whether voltage for selecting the node is output to supply convertor is defeated
Enter end.
Between each node and respective switch array, a voltage comparison unit is also provided with, correspondence is voltage
Comparing unit i (i=1 ... N-1) connections are the same as the hot end of level-one input power i, and the control of upper level switch arrays i+1
End processed.Voltage comparison unit i is used to judge whether the voltage of the node is less than predetermined threshold value Uthi (i=1~N-1), if
Less than predetermined threshold value Uthi, then upper level switch arrays i+1 conductings are controlled, otherwise be failure to actuate, make upper level switch arrays i+1
Remain open.Wherein, predetermined threshold value Uthi is typically that can be compared come what is formulated according to the minimum of supply convertor
The voltage is high, but cannot be low, and otherwise supply convertor can not work normally, and rear class equipment just has the risk of power down；It is and each
Predetermined threshold value Uth1~UthN-1 may be the same or different, as long as being all higher than the minimum work electricity equal to supply convertor
Pressure, is not specifically limited herein, depending on its application environment, in the protection domain of the application.
The output terminal of N number of switch arrays links together, and input voltage is provided for supply convertor.Particularly, switch arrays
Row 1 can be acquiescence one-way conduction, uncontrolled；And for other switch arrays, in adjacent switch array, input terminal voltage
When higher switch arrays turn on, the relatively low switch arrays of input terminal voltage reversely cut-off or shut-off, to avoid high voltage
Recharge is understood during output to the relatively low input power of voltage.
The supply convertor is the dcdc converter of industry routine, and such as buck, boost, Flyback, do not do and have herein
Body limits, depending on its application environment, in the protection domain of the application.
For the ease of describing the operation principle of the power supply selection circuit of the multi input power supply, it is assumed that the voltage of each input power
It is V, each predetermined threshold value Uth1~UthN-1 is Vth.Switch arrays 1 give tacit consent to forward conduction, the shut-off of other switch arrays.
After system electrification, give tacit consent to powered by input power 1 first, the output function of other nodes is closed, then the multi input at this time
The output voltage of the power supply selection circuit of power supply is VAO=V.If input power 1 is under-voltage at this time, condition VAO<Vth into
Vertical, then voltage comparison unit 1 will enable switch arrays 2 automatically and turn on, and input power 2 passes through node B after being cascaded with input power 1
Power to rear class, the output voltage of the power supply selection circuit of the multi input power supply is V at this timeBO=V1+V2, and obviously have VBO<V+
Vth.And so on, if voltage comparison unit 2 detects that node B is also under-voltage, meet VBO<Vth, then switch arrays 3 controlled
Conducting, input power 3,2,1 are powered after cascading by node C to rear class, at this time the power supply selection circuit of the multi input power supply
Output voltage is VCO=V1+V2+V3, and obviously have VCO<V+Vth.Situation below can continue to analogize, in short, voltage compares
The cooperating of unit and switch arrays so that the input voltage of supply convertor is controlled within V+Vth always.
The power supply selection circuit of the multi input power supply provided in this embodiment, passes through above-mentioned operation principle, it can be ensured that electricity
The input voltage of source converter is slightly above its minimum, and maximum is not over V+Vth, much smaller than in the prior art
Input voltage V × N, reduce the stresses of parts of supply convertor, and then the supply convertor of low pressure can be selected, reduce
System cost, meanwhile, without the power supply changeover device of reselection wide scope, the transfer efficiency of power supply changeover device is improved, namely keep away
The problem of having exempted to cause the transfer efficiency of supply convertor low and of high cost due to input voltage height in the prior art.
Also, the power supply selection circuit of the multi input power supply provided in this embodiment, can be between its multiple input power supply
Redundant power supply, as long as there is an input power to meet that voltage meets cascade after being more than Vth, or the series connection of several input powers
Voltage is more than Vth, you can to power for supply convertor, improves the reliability of power supply.
Another cascaded topology mode shown in for Fig. 2 b, i.e. multiple input power supply be independent, by after power conversion
Outlet side cascades, and the power supply selection circuit of the multi input power supply is equally applicable.Referring to Fig. 5, in the cascade system, although multiple defeated
Although entering power supply without directly connecting, since outlet side is series connection, current supply circuit still can be returned to by outlet side
The minimum reference edge O of input power.Therefore, operation principle is identical with the above, and details are not described herein again.
Fig. 4 and Fig. 5 is the situation of M=N, i.e., each input power has corresponded to a switch arrays respectively, also may be used certainly
To be to correspond to a switch arrays again after any number of continuous input powers combine, as shown in fig. 6, only with three input powers
Exemplified by vertical input, output cascade system, give tacit consent to common switch array 1 after being combined by input power 1 and input power 2 and supply together
Electricity, upon handover, is then powered together by input power 1, input power 2 and input power 3.The situation of more input powers is herein
Repeat no more, and each switch arrays correspond to several continuous input powers and are combined, and can need freely to configure according to system,
It is not specifically limited herein, as long as ensureing to be both provided with a voltage comparison unit between each pair adjacent switch array,
In the protection domain of the application.
Another embodiment of the present invention additionally provides a kind of power supply selection circuit of specific multi input power supply, in above-mentioned implementation
On the basis of example and Fig. 4 to Fig. 6, referring to Fig. 7, it is shown by taking N=M=3 as an example, tandem node is respectively O, A, B, C, its
Voltage comparison unit, as shown in the voltage comparison unit 1 in Fig. 7, including：First voltage-stabiliser tube ZD1, the first triode Q1,
One resistance R1 and second resistance R2；Wherein：
The input terminal phase of the anode of the first voltage-stabiliser tube ZD1 switch arrays relatively low with input terminal voltage in adjacent switch array
Even；
The cathode of first voltage-stabiliser tube ZD1 is connected by first resistor R1 with the base stage of the first triode Q1；
The emitter ground connection of first triode Q1；
The collector of first triode Q1 by second resistance R2 with input terminal voltage in adjacent switch array is higher opens
The input terminal for closing array is connected；
The control terminal of the collector of the first triode Q1 switch arrays higher with input terminal voltage in adjacent switch array
It is connected.
Preferably, the minimum switch arrays of input terminal voltage include in whole switch arrays：First diode D1, such as Fig. 7
In switch arrays 1 shown in.
The highest switch arrays of input terminal voltage include in whole switch arrays：3rd triode Q3, the 7th resistance R7,
Eight resistance R8, the 3rd voltage-stabiliser tube DZ3 and first switch pipe K1, as shown in the switch arrays 3 in Fig. 7；Wherein：
The base stage of 3rd triode Q3 is the control terminal of corresponding switch arrays；
The emitter ground connection of 3rd triode Q3；
The collector of 3rd triode Q3 passes through the cathode of the 7th resistance R7 and the 3rd voltage-stabiliser tube DZ3, the 8th resistance R8
The control terminal of one end and first switch pipe K1 are connected；
Anode, the other end of the 8th resistance R8 and the input terminal of first switch pipe K1 of 3rd voltage stabilizing DZ3 pipes are connected, connection
Point is the input terminal of corresponding switch arrays；
The output terminal of first switch pipe K1 is the output terminal of corresponding switch arrays.
At this time, rest switch array includes：4th triode Q4, the 9th resistance R9, the tenth resistance R10, the 4th voltage-stabiliser tube
ZD4, second switch pipe K2 and the second diode D2, as shown in the switch arrays 2 in Fig. 7；Wherein：
The base stage of 4th triode Q4 is the control terminal of corresponding switch arrays；
The emitter ground connection of 4th triode Q4；
The collector of 4th triode Q4 passes through the cathode of the 9th resistance R9 and the 4th voltage-stabiliser tube ZD4, the tenth resistance R10
The control terminal of one end and second switch pipe K2 are connected；
The input terminal of the anode of 4th voltage-stabiliser tube ZD4, the other end of the tenth resistance R10 and second switch pipe K2 is connected, even
Contact is the input terminal of corresponding switch arrays；
The output terminal of second switch pipe K2 is connected with the cathode of the second diode D2；
The anode of second diode D2 is the output terminal of corresponding switch arrays.
Referring to Fig. 7, which includes 3 PV component power supplys PV1, PV2, PV3,3 switch arrays, and 2 voltages are more single
Member, and a flyback power supply converter Flyback.It is mainly real using voltage-stabiliser tube and triode for voltage comparison unit 1
It is existing, as voltage VAODuring breakdown voltage more than the first voltage-stabiliser tube ZD1, the first voltage-stabiliser tube ZD1 is breakdown, and electric current flows into the one or three pole
The base stage of pipe Q1, the first triode Q1 conductings, otherwise the first triode Q1 cut-offs.Switch arrays 2 mainly have switching tube and two poles
Pipe is formed；When the first triode Q1 is turned on, the 4th triode Q4 shut-offs, second switch pipe K2 and the second diode D2 are closed
It is disconnected, the voltage V of node BBOIt can not export；Export to flyback power supply converter Flyback high potential input terminal voltage still
It is so the voltage V of node AAO；When the first triode Q1 is turned off, the 4th triode Q4 conductings, second switch pipe K2 and the two or two
Pole pipe D2 is both turned on, then the voltage V of node BBOExport to the high potential input terminal of flyback power supply converter Flyback.Similarly,
Voltage comparison unit 2 is identical with the operation principle of voltage comparison unit 1.For switch arrays 1, acquiescence is one-way conduction, therefore is made
It can be achieved with a diode；And switch arrays 3, it is consistent with array 2, but the diode of outlet side can be saved, because
Its outlet side does not have the voltage presence higher than total busbar, and the first diode D1 and the second diode D2, then can prevent each
From the high pressure recharge of outlet side to corresponding input side.
Known photovoltaic module PV is influenced by illumination and power, its voltage exported is changing always, it is assumed that each voltage
For excursion between 0-40V, the minimum of flyback power supply converter is 7V, therefore can be by voltage comparison unit
Predetermined threshold value is scheduled on 8V, and according to above-mentioned logic, the output situation that can be obtained in the state of each PV differences is as shown in table 1：
Output situation in the state of each PV differences of table 1
By table 1 as it can be seen that when 3 PV power, total busbar changes between 8-120V, passes through the power supply of the multi input power supply
Selection circuit, by output control between 8-48V, can effectively improve the working performance of supply convertor.
What deserves to be explained is for comparing unit, its implement form can also as shown in Figure 8 a, including：3rd electricity
Hinder R3, the 4th resistance R4, the 5th resistance R5 and the second triode Q2；Said exemplified by replacing the voltage comparison unit 2 in Fig. 7
It is bright：
The input terminal of one end of 3rd resistor R3 switch arrays relatively low with input terminal voltage in adjacent switch array is (as schemed
Node B in 7) it is connected, receiving voltage VBO；
The other end of 3rd resistor R3 is connected with one end of the 4th resistance R4 and the base stage of the second triode Q2；
The emitter of the other end of 4th resistance R4 and the second triode Q2 are grounded；
The collector of second triode Q2 by the 5th resistance R5 with input terminal voltage in adjacent switch array is higher opens
The input terminal (the node C in such as Fig. 7) for closing array is connected, receiving voltage VCO；
The control terminal of the collector of the second triode Q2 switch arrays higher with input terminal voltage in adjacent switch array
It is connected.
Or its voltage comparison unit can also as shown in Figure 8 b, including：Second voltage-stabiliser tube ZD2, optocoupler and the 6th electricity
Hinder R6；Also illustrated exemplified by replacing the voltage comparison unit 2 in Fig. 7：
The input terminal of the anode of the second voltage-stabiliser tube ZD2 switch arrays relatively low with input terminal voltage in adjacent switch array
(the node B in such as Fig. 7) is connected, receiving voltage VBO；
The cathode of second voltage-stabiliser tube ZD2 is connected with the input terminal of optocoupler；
The output terminal of optocoupler passes through the higher switch arrays of input terminal voltage in the 6th resistance R6 and adjacent switch array
Input terminal (the node C in such as Fig. 7) is connected, receiving voltage VCO；
The control terminal of the output terminal of the optocoupler switch arrays higher with input terminal voltage in adjacent switch array is connected.
In addition, for switch arrays 2 and 3, referring to Fig. 9 a, the 3rd switching tube K3 and the 5th voltage-stabiliser tube ZD5 can also be used
Instead of the 3rd triode Q3 in Fig. 7 switch arrays 3；The control terminal phase of the anode and the 3rd switching tube K3 of 5th voltage-stabiliser tube ZD5
Even, the cathode of the 5th voltage-stabiliser tube ZD5 is connected with the output terminal of the 3rd switching tube K3；And use the 4th switching tube K3 and the 6th voltage stabilizing
Pipe ZD6 replaces the 4th triode Q4 in Fig. 7 switch arrays 2；The control of the anode and the 4th switching tube K4 of 6th voltage-stabiliser tube ZD6
End is connected, and the cathode of the 6th voltage-stabiliser tube ZD6 is connected with the output terminal of the 4th switching tube K4；In each switch arrays remaining device with
Fig. 7 is identical, no longer repeats one by one herein.
Alternatively, referring to Fig. 9 b, unlike Fig. 7, the minimum switch arrays of input terminal voltage in its whole switch arrays,
That is the switch arrays 1 in Fig. 9, including：3rd diode D3；
The highest switch arrays of input terminal voltage in whole switch arrays, i.e. switch arrays 3 in Fig. 9, including：Five or three
Pole pipe Q5 and the first relay；Wherein：
The base stage of 5th triode Q5 is the control terminal of corresponding switch arrays；
The emitter ground connection of 5th triode Q5；
The collector of 5th triode Q5 is connected with coil one end of the first relay；
The coil other end of first relay receives supply voltage Vrelay；
Normal open switch one end of first relay is the input terminal of corresponding switch arrays；
The normal open switch other end of first relay is the output terminal of corresponding switch arrays；
Rest switch array, as shown in the switch arrays 2 in Fig. 9, including：6th triode Q6, the second relay and
Four diode D4；Wherein：
The base stage of 6th triode Q6 is the control terminal of corresponding switch arrays；
The emitter ground connection of 6th triode Q6；
The collector of 6th triode Q6 is connected with coil one end of the second relay；
The coil other end of second relay receives supply voltage Vrelay；
Normal open switch one end of second relay is the input terminal of corresponding switch arrays；
The normal open switch other end of second relay is connected with the cathode of the 4th diode D4；
The anode of 4th diode D4 is the output terminal of corresponding switch arrays.
Or as is shown in fig. 9 c, the 5th triode can also be replaced with the 5th switching tube K5 and the 7th voltage-stabiliser tube DZ7
Q5；The anode of 7th voltage-stabiliser tube DZ7 is connected with the control terminal of the 5th switching tube K5, and the cathode of the 7th voltage-stabiliser tube DZ7 is opened with the 5th
The output terminal for closing pipe K5 is connected；
6th triode Q3 is replaced with the 6th switching tube K6 and the 8th voltage-stabiliser tube DZ8；The anode of 8th voltage-stabiliser tube DZ8 and
The control terminal of six switching tube K6 is connected, and the cathode of the 8th voltage-stabiliser tube DZ8 is connected with the output terminal of the 6th switching tube K6.
In Fig. 9 b and Fig. 9 c, the normal open switch of relay is simultaneously turned on or closed with the triode of its prime or switching tube
Disconnected, specific operation principle is identical with the above, and details are not described herein again.Supply voltage Vrelay can be by multiple input electricity
Source coordinates corresponding translation circuit to realize, can also be provided by outlet side load power source, in the protection domain of the application.
What deserves to be explained is circuit shown in Fig. 7 is the one kind for the power supply selection circuit for realizing the multi input power supply, for
Voltage comparison unit, except form shown in form shown in Fig. 7, Fig. 8 a and Fig. 8 b, can also use electric resistance partial pressure combination comparator,
Can also be that TL431 coordinates triode, or optocoupler etc. to realize；For switch arrays, can be Fig. 7, Fig. 9 a, Fig. 9 b or
Form shown in person Fig. 9 c, or, on the basis of Fig. 9 b and Fig. 9 c, illustrated by taking switch arrays 2 as an example, work as voltage
When 2 controlling switch array 3 of comparing unit turns on, supply voltage can also be realized in conjunction with comparator by voltage comparison unit 2
The supply disconnection of Vrelay, controlling switch array 2 turn off, and then replace the reverse cutoff function of the 4th diode D4, avoid saving
Point C passes through 2 recharge of switch arrays to node B by the high voltage that switch arrays 3 export；And above-mentioned each switching tube can be
MOSFET can also be relay, depending on its visual concrete application environment, be not specifically limited herein, the guarantor in the application
In the range of shield.
Another embodiment of the present invention additionally provides a kind of power supply unit of multi input power supply, for for M under cascade structure
The rear class equipment power supply of input power, as shown in Figures 4 to 7, the power supply unit of the multi input power supply includes：Supply convertor with
And the power supply selection circuit of the multi input power supply such as above-mentioned any embodiment, M are the positive integer more than 1；Wherein：
The output terminal of power supply selection circuit is connected with the high potential input terminal of supply convertor；
The low potential input end grounding of supply convertor；
The output terminal of supply convertor is connected with the feeder ear of rear class equipment.
Preferably, supply convertor is boosting, decompression or reverse exciting topological.
Specific operation principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described by the way of progressive in the present invention, and what each embodiment stressed is and other realities
Apply the difference of example, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, not make limitation in any form to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of power supply selection circuit of multi input power supply, it is characterised in that after for M input power under cascade structure
Level equipment power supply unit provides the input voltage of supply convertor, including：N number of controllable switch arrays and N-1 voltage compare
Unit, M and N are the positive integer more than 1, and N≤M；Wherein：
Hot end of the input terminal of N number of switch arrays respectively from different input powers is connected；
The output terminal of N number of switch arrays is connected with the high potential input terminal of the supply convertor；
A voltage comparison unit is respectively arranged between adjacent switch array, for when input terminal voltage in adjacent switch array
When the input terminal voltage of relatively low switch arrays is less than predetermined threshold value, input terminal voltage is higher in control adjacent switch array opens
Close array conducting；The predetermined threshold value is more than or equal to the minimum of the supply convertor；
The original state of the minimum switch arrays of input terminal voltage is conducting in whole switch arrays；And in adjacent switch array,
When the higher switch arrays of input terminal voltage turn on, reversely cut-off or the shut-off of the relatively low switch arrays of input terminal voltage.
2. the power supply selection circuit of multi input power supply according to claim 1, it is characterised in that the voltage comparison unit
Including：First voltage-stabiliser tube, the first triode, first resistor and second resistance；Wherein：
The input terminal of the anode of first voltage-stabiliser tube switch arrays relatively low with input terminal voltage in adjacent switch array is connected；
The cathode of first voltage-stabiliser tube is connected by the first resistor with the base stage of first triode；
The emitter ground connection of first triode；
The collector of first triode by the second resistance with input terminal voltage in adjacent switch array is higher opens
The input terminal for closing array is connected；
The control terminal phase of the collector of first triode switch arrays higher with input terminal voltage in adjacent switch array
Even.
3. the power supply selection circuit of multi input power supply according to claim 1, it is characterised in that the voltage comparison unit
Including：3rd resistor, the 4th resistance, the 5th resistance and the second triode；Wherein：
The input terminal of one end of 3rd resistor switch arrays relatively low with input terminal voltage in adjacent switch array is connected；
The other end of the 3rd resistor is connected with one end of the 4th resistance and the base stage of second triode；
The other end of 4th resistance and the emitter ground connection of second triode；
The collector of second triode by the 5th resistance with input terminal voltage in adjacent switch array is higher opens
The input terminal for closing array is connected；
The control terminal phase of the collector of second triode switch arrays higher with input terminal voltage in adjacent switch array
Even.
4. the power supply selection circuit of multi input power supply according to claim 1, it is characterised in that the voltage comparison unit
Including：Second voltage-stabiliser tube, optocoupler and the 6th resistance；Wherein：
The input terminal of the anode of second voltage-stabiliser tube switch arrays relatively low with input terminal voltage in adjacent switch array is connected；
The cathode of second voltage-stabiliser tube is connected with the input terminal of the optocoupler；
The output terminal of the optocoupler passes through the higher switch arrays of input terminal voltage in the 6th resistance and adjacent switch array
Input terminal be connected；
The control terminal of the output terminal of the optocoupler switch arrays higher with input terminal voltage in adjacent switch array is connected.
5. according to the power supply selection circuit of any multi input power supplys of claim 1-4, it is characterised in that whole switch arrays
The minimum switch arrays of input terminal voltage include in row：First diode；
The highest switch arrays of input terminal voltage include in whole switch arrays：3rd triode, the 7th resistance, the 8th resistance,
3rd voltage-stabiliser tube and first switch pipe；Wherein：
The base stage of 3rd triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 3rd triode；
The collector of 3rd triode passes through the 7th resistance and cathode, the 8th resistance of the 3rd voltage-stabiliser tube
One end and the control terminal of the first switch pipe be connected；
Anode, the other end of the 8th resistance and the input terminal of the first switch pipe of 3rd voltage-stabiliser tube are connected, even
Contact is the input terminal of corresponding switch arrays；
The output terminal of the first switch pipe is the output terminal of corresponding switch arrays；
Rest switch array includes：4th triode, the 9th resistance, the tenth resistance, the 4th voltage-stabiliser tube, second switch pipe and second
Diode；Wherein：
The base stage of 4th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 4th triode；
The collector of 4th triode passes through the 9th resistance and cathode, the tenth resistance of the 4th voltage-stabiliser tube
One end and the control terminal of the second switch pipe be connected；
Anode, the other end of the tenth resistance and the input terminal of the second switch pipe of 4th voltage-stabiliser tube are connected, even
Contact is the input terminal of corresponding switch arrays；
The output terminal of the second switch pipe is connected with the cathode of second diode；
The anode of second diode is the output terminal of corresponding switch arrays.
6. the power supply selection circuit of multi input power supply according to claim 5, it is characterised in that with the 3rd switching tube and
Five voltage-stabiliser tubes replace the 3rd triode；The anode of 5th voltage-stabiliser tube is connected with the control terminal of the 3rd switching tube,
The cathode of 5th voltage-stabiliser tube is connected with the output terminal of the 3rd switching tube；
4th triode is replaced with the 4th switching tube and the 6th voltage-stabiliser tube；The anode and the described 4th of 6th voltage-stabiliser tube
The control terminal of switching tube is connected, and the cathode of the 6th voltage-stabiliser tube is connected with the output terminal of the 4th switching tube.
7. according to the power supply selection circuit of any multi input power supplys of claim 1-4, it is characterised in that whole switch arrays
The minimum switch arrays of input terminal voltage include in row：3rd diode；
The highest switch arrays of input terminal voltage include in whole switch arrays：5th triode and the first relay；Wherein：
The base stage of 5th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 5th triode；
The collector of 5th triode is connected with coil one end of first relay；
The coil other end of first relay receives supply voltage；
Normal open switch one end of first relay is the input terminal of corresponding switch arrays；
The normal open switch other end of first relay is the output terminal of corresponding switch arrays；
Rest switch array includes：6th triode, the second relay and the 4th diode；Wherein：
The base stage of 6th triode is the control terminal of corresponding switch arrays；
The emitter ground connection of 6th triode；
The collector of 6th triode is connected with coil one end of second relay；
The coil other end of second relay receives the supply voltage；
Normal open switch one end of second relay is the input terminal of corresponding switch arrays；
The normal open switch other end of second relay is connected with the cathode of the 4th diode；
The anode of 4th diode is the output terminal of corresponding switch arrays.
8. the power supply selection circuit of multi input power supply according to claim 7, it is characterised in that with the 5th switching tube and
Seven voltage-stabiliser tubes replace the 5th triode；The anode of 7th voltage-stabiliser tube is connected with the control terminal of the 5th switching tube,
The cathode of 7th voltage-stabiliser tube is connected with the output terminal of the 5th switching tube；
6th triode is replaced with the 6th switching tube and the 8th voltage-stabiliser tube；The anode and the described 6th of 8th voltage-stabiliser tube
The control terminal of switching tube is connected, and the cathode of the 8th voltage-stabiliser tube is connected with the output terminal of the 6th switching tube.
9. a kind of power supply unit of multi input power supply, it is characterised in that for being set for the rear class of M input power under cascade structure
Available electricity, the power supply unit of the multi input power supply include：Supply convertor and how defeated as described in claim 1-8 is any
Enter the power supply selection circuit of power supply, M is the positive integer more than 1；Wherein：
The output terminal of the power supply selection circuit is connected with the high potential input terminal of the supply convertor；
The low potential input end grounding of the supply convertor；
The output terminal of the supply convertor is connected with the feeder ear of the rear class equipment.
10. the power supply unit of multi input power supply according to claim 9, it is characterised in that the supply convertor is liter
Pressure, decompression or reverse exciting topological.
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