CN104638729A - Parallel connection type photovoltaic charger fault management system and method - Google Patents
Parallel connection type photovoltaic charger fault management system and method Download PDFInfo
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- CN104638729A CN104638729A CN201510068434.XA CN201510068434A CN104638729A CN 104638729 A CN104638729 A CN 104638729A CN 201510068434 A CN201510068434 A CN 201510068434A CN 104638729 A CN104638729 A CN 104638729A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007726 management method Methods 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 230000015556 catabolic process Effects 0.000 claims description 25
- 230000007257 malfunction Effects 0.000 claims description 10
- 239000002699 waste material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/082—Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention relates to a parallel connection type photovoltaic charger fault management system, which comprises one photovoltaic plate, one charging control module, one PWM (pulse width modulation) driving circuit, one backup battery, one charging main circuit, one photovoltaic voltage sampling circuit, one output voltage sampling circuit, one battery voltage sampling circuit, one fault judging and isolation control module and one output unit. The invention also provides a corresponding parallel connection type photovoltaic charger fault management method. The system and the method solve the problems that in the prior art, if one path or several paths of BUCK circuit in a photovoltaic charger system with multiple paths of BUCK circuits in parallel work fails, the system can still realize the charging, but the MPPT (maximum power point tracking) charging cannot be carried out, the energy waste is caused, and the warning cannot be provided in time.
Description
Technical field
The present invention relates to a kind of parallel connection type photovoltaic charger Fault Management System and method.
Background technology
Solar energy MPPT charger is the device utilizing photovoltaic energy to charge a battery, and MPPT charging is i.e. so-called maximal power tracing charging also, and photovoltaic voltage can be in the maximum power point place of photovoltaic curve when charging.Wherein BUCK reduction voltage circuit utilizes more main topological circuit in solar energy MPPT charger, at present in order to improve the power output problem of BUCK step-down photovoltaic charger, adopts the direct parallel way of multichannel BUCK circuit.But multichannel BUCK circuit is directly in parallel, according to the characteristic of BUCK circuit, when certain one or more BUCK circuit breaks down, the power switch pipe as BUCK circuit is breakdown, and photovoltaic voltage can be pulled down to instantaneously by cell voltage and maintain an equal level with cell voltage, although now also can charge the battery, but now impact the BUCK circuit of normal branch road, MPPT controls ineffective, cannot carry out maximum power charging, greatly reduce photovoltaic conversion efficiency, cause energy dissipation.When one or more BUCK circuit breaks down, current technology fails effectively to detect fault, can not carry out very first time process to fault, and manual stoppage's mode can only be adopted to remove detection failure branch road.
Summary of the invention
For above technical background mention the shortcoming of existing scheme, the invention provides a kind of parallel connection type photovoltaic charger Fault Management System and method, if solve a certain road or several roads BUCK fault in the photovoltaic charger system of multichannel BUCK circuit in parallel work in prior art, system still can be charged, but can not carry out MPPT (maximum power) charging, cause energy dissipation and the problem that warning cannot be provided in time.
For achieving the above object, the present invention adopts following technical scheme: a kind of parallel connection type photovoltaic charger Fault Management System, comprises a photovoltaic polar plate, a charge control module, a PWM drive circuit and a backup battery, characterized by further comprising:
One charging main circuit, described charging main circuit is made up of the 1 to the n-th charging paths parallel connection, and each road charging paths is made up of an input unit and a BUCK circuit connected in series;
One photovoltaic voltage sample circuit, for the output voltage Upv of described photovoltaic polar plate of sampling;
One output voltage sampling circuit, for the output voltage Uout of described photovoltaic charger of sampling;
One battery voltage sampling circuit, for the described backup battery voltage U bat that samples;
One breakdown judge and isolated controlling module, for judging whether the 1 to the n-th charging paths of described charging main circuit breaks down, if charging paths breaks down, identify the charging paths of fault and disconnect, trouble-free charging paths continues charging work, and the number of faults of the 1 to the n-th charging paths of described charging main circuit is fed back to described charge control module;
One output unit;
Described charge control module, for control of charging, when whether the 1 to the n-th charging paths of described charging main circuit breaks down, according to breakdown judge and isolated controlling module feedback number of faults adjustment System charging current
i always output current limiting point;
Described photovoltaic polar plate, charging main circuit, output unit, backup battery connects successively, the output of described photovoltaic polar plate is also connected with the input of photovoltaic voltage sample circuit, the output of described charging main circuit is also connected with the input of output voltage sampling circuit, the output of described output unit is also connected with the input of battery voltage sampling circuit, described photovoltaic voltage sample circuit, output voltage sampling circuit, the output of battery voltage sampling circuit is connected with the input of breakdown judge with isolated controlling module respectively, the output of described breakdown judge and isolated controlling module respectively with output unit, the input of charge control module and n input unit connect, the output of described charge control module is connected with the input of PWM drive circuit, the output of described PWM drive circuit is connected with n BUCK circuit.
In an embodiment of the present invention, also comprise an alarm module, described alarm module and described breakdown judge and isolated controlling model calling.
In an embodiment of the present invention, described breakdown judge and isolated controlling module are also for when wherein m charging paths breaks down, the output current limiting of charge control module point is adjusted to original (n-m)/n times, described n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O.
Based on a parallel connection type photovoltaic charger failure management method for described parallel connection type photovoltaic charger Fault Management System, it is characterized in that comprising the following steps:
Step one: gather, the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger and backup battery voltage U bat;
Step 2: start breakdown judge and process, after the output voltage Upv of photovoltaic polar plate meets the charge condition of photovoltaic charger, if photovoltaic charger is normal, then enter MPPT charging to control, if photovoltaic charger fault, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowenter MPPT charging after being adjusted to original (n-m)/n times to control;
Step 3: running breakdown judge and process, photovoltaic charger is in MPPT charging control process, when there is suspected malfunctions phenomenon in photovoltaic charger, judgement is that photovoltaic charger fault causes or the output voltage of photovoltaic polar plate is too low to be caused, if photovoltaic charger fault causes, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowbe adjusted to original (n-m)/n times, cause if the output voltage of photovoltaic polar plate is too low, then the 1 to the n-th input unit and the output unit that control photovoltaic charger disconnect.
In an embodiment of the present invention, following concrete steps are comprised:
Step S1: the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger, backup battery voltage U bat, enter step S2;
Step S2: judge whether the output voltage Upv of photovoltaic polar plate is more than or equal to A backup battery voltage U bat doubly, if Upv >=A*Ubat, then enters step S3, otherwise terminate;
Step S3: control the 1 to the n-th input unit and be in conducting state, enter step S4;
Step S4: judge whether photovoltaic charger breaks down, if photovoltaic charger breaks down, enter step S6, otherwise enter step S5;
Step S5: control output unit and be in conducting state, the 1 to the n-th BUCK circuit working, enter step S9;
Step S6: control the 1 to the n-th input unit, output unit are in off-state, enter step S7;
Step S7: adopt fault position method failure judgement charging paths, mark fault branch, enters step S8;
Step S8: charge normal the input unit of branch road, output unit conducting, the 1 to the n-th BUCK circuit working in control the 1 to the n-th, the output current limiting of charge control module point is adjusted to original (n-m)/n times, wherein n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O, enters step S9;
Step S9: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S10, otherwise terminate;
Step S10: close PWM drive singal, enter step S11;
Step S11: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S13, otherwise enters step S12;
Step S12: open PWM drive singal, and terminate;
Step S13: control the 1 to the n-th input unit and disconnect, enter step S14;
Step S14: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S15, otherwise enters step S6;
Step S15: control output unit and disconnect, and terminate.
In an embodiment of the present invention, described A is more than or equal to 1.2.
In an embodiment of the present invention, described C is more than or equal to 0.5.
In an embodiment of the present invention, the specific implementation of described step S4 is: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, as Uout >=B*Upv, photovoltaic charger is masked as malfunction, as Uout < B*Upv, photovoltaic charger is masked as normal condition.
In an embodiment of the present invention, described step S7 adopts fault position method failure judgement charging paths, and the specific implementation step of mark fault branch is:
Step S701: make k=0, enters step S702;
Step S702: control kth+1 charging paths and be in conducting state, enter step S703;
Step S703: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, if Uout >=B*Upv, enters step S705, otherwise enters step S704;
Step S704: make i=k+1, is masked as normal condition by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S705: make i=k+1, is masked as malfunction by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S706: judge whether k+1 is more than or equal to n, if k+1 >=n, then terminate, otherwise enter step S707;
Step S707: make k=i, enters step S702.
In an embodiment of the present invention, described B span be: 0.9≤B≤0.95.
The present invention compared with prior art has following beneficial effect:
1, adopt in the photovoltaic charger of multichannel BUCK circuit in parallel work, start at photovoltaic charger and in the charging course of work, fault fast detecting carried out to the BUCK circuit of photovoltaic charger;
2, in the BUCK fault testing process of photovoltaic charger, BUCK circuit malfunctions can be distinguished or photovoltaic voltage is lower, wrong report can not be there is and fail to report, after detecting that the BUCK circuit of photovoltaic charger breaks down, the BUCK circuit of energy quick position fault, can be after-sales service and provide effective information, avoid artificial mode to adopt investigating one by one, change fault BUCK circuit;
3, the BUCK circuit of fault is isolated simultaneously, make it can not have influence on normal charging module, and adjust the current limliting working point of photovoltaic charger, make trouble-free BUCK circuit continue MPPT charging, improve photovoltaic polar plate capacity usage ratio.
Accompanying drawing explanation
Fig. 1 is parallel connection type photovoltaic charger Fault Management System schematic diagram of the present invention.
Fig. 2 is the flow chart of parallel connection type photovoltaic charger failure management method of the present invention.
Fig. 3 is the flow chart of step S4 in parallel connection type photovoltaic charger failure management method of the present invention.
Fig. 4 is the flow chart of step S7 in parallel connection type photovoltaic charger failure management method of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Please refer to Fig. 1, the invention provides a kind of parallel connection type photovoltaic charger Fault Management System, comprise a photovoltaic polar plate, a charge control module, a PWM drive circuit and a backup battery, characterized by further comprising:
One charging main circuit, described charging main circuit is made up of the 1 to the n-th charging paths parallel connection, and each road charging paths is made up of an input unit and a BUCK circuit connected in series;
One photovoltaic voltage sample circuit, for the output voltage Upv of described photovoltaic polar plate of sampling;
One output voltage sampling circuit, for the output voltage Uout of described photovoltaic charger of sampling;
One battery voltage sampling circuit, for the described backup battery voltage U bat that samples;
One breakdown judge and isolated controlling module, for judging whether the 1 to the n-th charging paths of described charging main circuit breaks down, if charging paths breaks down, identify the charging paths of fault and disconnect, trouble-free charging paths continues charging work, and the number of faults of the 1 to the n-th charging paths of described charging main circuit is fed back to described charge control module;
One output unit;
Described charge control module, for control of charging, when whether the 1 to the n-th charging paths of described charging main circuit breaks down, according to breakdown judge and isolated controlling module feedback number of faults adjustment System charging current
i always output current limiting point;
Described photovoltaic polar plate, charging main circuit, output unit, backup battery connects successively, the output of described photovoltaic polar plate is also connected with the input of photovoltaic voltage sample circuit, the output of described charging main circuit is also connected with the input of output voltage sampling circuit, the output of described output unit is also connected with the input of battery voltage sampling circuit, described photovoltaic voltage sample circuit, output voltage sampling circuit, the output of battery voltage sampling circuit is connected with the input of breakdown judge with isolated controlling module respectively, the output of described breakdown judge and isolated controlling module respectively with output unit, the input of charge control module and n input unit connect, the output of described charge control module is connected with the input of PWM drive circuit, the output of described PWM drive circuit is connected with n BUCK circuit.
Continue referring to Fig. 1, also comprise an alarm module, described alarm module and described breakdown judge and isolated controlling model calling.
In the present embodiment, described breakdown judge and isolated controlling module are also for when wherein m charging paths breaks down, the output current limiting of charge control module point is adjusted to original (n-m)/n doubly, described n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O.
The present invention also provides a kind of parallel connection type photovoltaic charger failure management method based on described parallel connection type photovoltaic charger Fault Management System, it is characterized in that comprising the following steps:
Step one: gather, the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger and backup battery voltage U bat;
Step 2: start breakdown judge and process, after the output voltage Upv of photovoltaic polar plate meets the charge condition of photovoltaic charger, if photovoltaic charger is normal, then enter MPPT charging to control, if photovoltaic charger fault, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowenter MPPT charging after being adjusted to original (n-m)/n times to control;
Step 3: running breakdown judge and process, photovoltaic charger is in MPPT charging control process, when there is suspected malfunctions phenomenon in photovoltaic charger, judgement is that photovoltaic charger fault causes or the output voltage of photovoltaic polar plate is too low to be caused, if photovoltaic charger fault causes, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowbe adjusted to original (n-m)/n times, cause if the output voltage of photovoltaic polar plate is too low, then the 1 to the n-th input unit and the output unit that control photovoltaic charger disconnect.
Please refer to Fig. 2, parallel connection type photovoltaic charger failure management method comprises following concrete steps:
Step S1: the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger, backup battery voltage U bat, enter step S2;
Step S2: judge whether the output voltage Upv of photovoltaic polar plate is more than or equal to A backup battery voltage U bat doubly, if Upv >=A*Ubat, then enters step S3, otherwise terminate;
Step S3: control the 1 to the n-th input unit and be in conducting state, enter step S4;
Step S4: judge whether photovoltaic charger breaks down, if photovoltaic charger breaks down, enter step S6, otherwise enter step S5;
Step S5: control output unit and be in conducting state, the 1 to the n-th BUCK circuit working, enter step S9;
Step S6: control the 1 to the n-th input unit, output unit are in off-state, enter step S7;
Step S7: adopt fault position method failure judgement charging paths, mark fault branch, enters step S8;
Step S8: charge normal the input unit of branch road, output unit conducting, the 1 to the n-th BUCK circuit working in control the 1 to the n-th, the output current limiting of charge control module point is adjusted to original (n-m)/n times, wherein n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O, enters step S9;
Step S9: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S10, otherwise terminate;
Step S10: close PWM drive singal, enter step S11;
Step S11: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S13, otherwise enters step S12;
Step S12: open PWM drive singal, and terminate;
Step S13: control the 1 to the n-th input unit and disconnect, enter step S14;
Step S14: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S15, otherwise enters step S6;
Step S15: control output unit and disconnect, and terminate.
In the present embodiment, described A is more than or equal to 1.2.
In the present embodiment, described C is more than or equal to 0.5.
Please refer to Fig. 3, the specific implementation of described step S4 is: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, as Uout >=B*Upv, photovoltaic charger is masked as malfunction, as Uout < B*Upv, photovoltaic charger is masked as normal condition.
Please refer to Fig. 4, described step S7 adopts fault position method failure judgement charging paths, and the specific implementation step of mark fault branch is:
Step S701: make k=0, enters step S702;
Step S702: control kth+1 charging paths and be in conducting state, enter step S703;
Step S703: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, if Uout >=B*Upv, enters step S705, otherwise enters step S704;
Step S704: make i=k+1, is masked as normal condition by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S705: make i=k+1, is masked as malfunction by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S706: judge whether k+1 is more than or equal to n, if k+1 >=n, then terminate, otherwise enter step S707;
Step S707: make k=i, enters step S702.
In the present embodiment, described B span be: 0.9≤B≤0.95.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a parallel connection type photovoltaic charger Fault Management System, comprises a photovoltaic polar plate, a charge control module, a PWM drive circuit and a backup battery, characterized by further comprising:
One charging main circuit, described charging main circuit is made up of the 1 to the n-th charging paths parallel connection, and each road charging paths is made up of an input unit and a BUCK circuit connected in series;
One photovoltaic voltage sample circuit, for the output voltage Upv of described photovoltaic polar plate of sampling;
One output voltage sampling circuit, for the output voltage Uout of described photovoltaic charger of sampling;
One battery voltage sampling circuit, for the described backup battery voltage U bat that samples;
One breakdown judge and isolated controlling module, for judging whether the 1 to the n-th charging paths of described charging main circuit breaks down, if charging paths breaks down, identify the charging paths of fault and disconnect, trouble-free charging paths continues charging work, and the number of faults of the 1 to the n-th charging paths of described charging main circuit is fed back to described charge control module;
One output unit;
Described charge control module, for control of charging, when whether the 1 to the n-th charging paths of described charging main circuit breaks down, according to breakdown judge and isolated controlling module feedback number of faults adjustment System charging current
i always output current limiting point;
Described photovoltaic polar plate, charging main circuit, output unit, backup battery connects successively, the output of described photovoltaic polar plate is also connected with the input of photovoltaic voltage sample circuit, the output of described charging main circuit is also connected with the input of output voltage sampling circuit, the output of described output unit is also connected with the input of battery voltage sampling circuit, described photovoltaic voltage sample circuit, output voltage sampling circuit, the output of battery voltage sampling circuit is connected with the input of breakdown judge with isolated controlling module respectively, the output of described breakdown judge and isolated controlling module respectively with output unit, the input of charge control module and n input unit connect, the output of described charge control module is connected with the input of PWM drive circuit, the output of described PWM drive circuit is connected with n BUCK circuit.
2. a kind of parallel connection type photovoltaic charger Fault Management System according to claim 1, is characterized in that: also comprise an alarm module, described alarm module and described breakdown judge and isolated controlling model calling.
3. a kind of parallel connection type photovoltaic charger Fault Management System according to claim 1, it is characterized in that: described breakdown judge and isolated controlling module are also for when wherein m charging paths breaks down, the output current limiting of charge control module point is adjusted to original (n-m)/n times, described n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O.
4., based on a parallel connection type photovoltaic charger failure management method for parallel connection type photovoltaic charger Fault Management System as described in as arbitrary in claims 1 to 3, it is characterized in that comprising the following steps:
Step one: gather, the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger and backup battery voltage U bat;
Step 2: start breakdown judge and process, after the output voltage Upv of photovoltaic polar plate meets the charge condition of photovoltaic charger, if photovoltaic charger is normal, then enter MPPT charging to control, if photovoltaic charger fault, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowenter MPPT charging after being adjusted to original (n-m)/n times to control;
Step 3: running breakdown judge and process, photovoltaic charger is in MPPT charging control process, when there is suspected malfunctions phenomenon in photovoltaic charger, judgement is that photovoltaic charger fault causes or the output voltage of photovoltaic polar plate is too low to be caused, if photovoltaic charger fault causes, then adopt fault position method the charging paths of fault to be located, and will the m road charging paths isolation of fault be carried out, by the output current limiting of charge control module point I
lowbe adjusted to original (n-m)/n times, cause if the output voltage of photovoltaic polar plate is too low, then the 1 to the n-th input unit and the output unit that control photovoltaic charger disconnect.
5. a kind of parallel connection type photovoltaic charger failure management method according to claim 4, is characterized in that comprising following concrete steps:
Step S1: the output voltage Upv of Real-time Collection photovoltaic polar plate, the output voltage Uout of photovoltaic charger, backup battery voltage U bat, enter step S2;
Step S2: judge whether the output voltage Upv of photovoltaic polar plate is more than or equal to A backup battery voltage U bat doubly, if Upv >=A*Ubat, then enters step S3, otherwise terminate;
Step S3: control the 1 to the n-th input unit and be in conducting state, enter step S4;
Step S4: judge whether photovoltaic charger breaks down, if photovoltaic charger breaks down, enter step S6, otherwise enter step S5;
Step S5: control output unit and be in conducting state, the 1 to the n-th BUCK circuit working, enter step S9;
Step S6: control the 1 to the n-th input unit, output unit are in off-state, enter step S7;
Step S7: adopt fault position method failure judgement charging paths, mark fault branch, enters step S8;
Step S8: charge normal the input unit of branch road, output unit conducting, the 1 to the n-th BUCK circuit working in control the 1 to the n-th, the output current limiting of charge control module point is adjusted to original (n-m)/n times, wherein n be more than or equal to 2 positive integer, m is the natural number being more than or equal to O, enters step S9;
Step S9: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S10, otherwise terminate;
Step S10: close PWM drive singal, enter step S11;
Step S11: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S13, otherwise enters step S12;
Step S12: open PWM drive singal, and terminate;
Step S13: control the 1 to the n-th input unit and disconnect, enter step S14;
Step S14: judge whether the output voltage Upv of photovoltaic is less than or equal to Uout+C, if Upv≤Uout+C, then enters step S15, otherwise enters step S6;
Step S15: control output unit and disconnect, and terminate.
6. a kind of parallel connection type photovoltaic charger failure management method according to claim 5, is characterized in that: described A is more than or equal to 1.2.
7. a kind of parallel connection type photovoltaic charger failure management method according to claim 5, is characterized in that: described C is more than or equal to 0.5.
8. a kind of parallel connection type photovoltaic charger failure management method according to claim 5, it is characterized in that: the specific implementation of described step S4 is: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, as Uout >=B*Upv, photovoltaic charger is masked as malfunction, as Uout < B*Upv, photovoltaic charger is masked as normal condition.
9. a kind of parallel connection type photovoltaic charger failure management method according to claim 5, is characterized in that: described step S7 adopts fault position method failure judgement charging paths, and the specific implementation step of mark fault branch is:
Step S701: make k=0, enters step S702;
Step S702: control kth+1 charging paths and be in conducting state, enter step S703;
Step S703: judge whether the output voltage Uout of photovoltaic charger is more than or equal to the output voltage Upv of B photovoltaic polar plate doubly, if Uout >=B*Upv, enters step S705, otherwise enters step S704;
Step S704: make i=k+1, is masked as normal condition by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S705: make i=k+1, is masked as malfunction by kth+1 charging paths, controls kth+1 charging paths and is in off-state, enter step S706;
Step S706: judge whether k+1 is more than or equal to n, if k+1 >=n, then terminate, otherwise enter step S707;
Step S707: make k=i, enters step S702.
10. a kind of parallel connection type photovoltaic charger failure management method according to claim 8 or claim 9, is characterized in that: described B span be: 0.9≤B≤0.95.
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