CN108982992A - The online addition detection method of DC charging system, PDU and charging path - Google Patents
The online addition detection method of DC charging system, PDU and charging path Download PDFInfo
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- CN108982992A CN108982992A CN201810575494.4A CN201810575494A CN108982992A CN 108982992 A CN108982992 A CN 108982992A CN 201810575494 A CN201810575494 A CN 201810575494A CN 108982992 A CN108982992 A CN 108982992A
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- optocoupler
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to the online addition detection methods of a kind of DC charging system, PDU and charging path, power distributing unit includes control module and the first optocoupler detection circuit corresponding with each charging path, first optocoupler detection circuit include the first optocoupler and be connected to the first optocoupler input terminal the first current limiting device, moreover, the input terminal of the first optocoupler detection circuit is in parallel with the power input of corresponding charging gun by the first relay and the second relay；Control module, for in the charging path being added online the first relay and the second relay detect when, in the state that corresponding power module remains turned-off, control the first relay, the second relay is turned off or is closed, and the health status of the first relay and the second relay is determined according to the on-off of the first optocoupler.Implement technical solution of the present invention, the detection accuracy of relay health status can be improved and shorten detection time, improves effective charging time of user, promote the experience of user's charging.
Description
Technical field
The present invention relates to electric car fields more particularly to the online of a kind of DC charging system, PDU and charging path to add
Enter detection method.
Background technique
With the fast development of current electric car, charging pile also emerging in large numbers like the mushrooms after rain, in order to meet multiple vehicles
Simultaneously and efficiently complete charge, derive group charging system.In charging system, power distributing unit (PDU) is by one
The control of item or a plurality of charging path carrys out schedule power module.Charging path is made of some electronic devices such as relay, this
A little composition devices are easy to damage, and such as stick together or drive failure, it is therefore necessary to detect being good for for relay in charging path
Health situation, avoids the occurrence of safety problem.
Currently, when being detected to the relay in charging path, used method are as follows: in parallel resistance on relay
The higher IGBT pipe of grade is flowed, then by controlling the on-off of corresponding relay and IGBT pipe, and to multiple sampled voltages
Signal is AD converted processing, judges whether relay is reliable further according to the relationship between treated each voltage signal.
But this detection method has the following deficiencies: that 1. need to be AD converted sampled voltage processing, the state-detection of relay
Precision is influenced by ADC conversion accuracy；2.ADC conversion takes a long time, and the reality for being unable to satisfy current quick charge is wanted
It asks.
Summary of the invention
To solve the technical problem that detection accuracy is low in the prior art and detection time is long, the present invention provides a kind of direct current and fills
The online addition detection method of electric system, PDU and charging path can be improved detection accuracy, shorten detection time.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of power distributing unit, including setting
In each charging path and it is respectively used to carry out two power inputs of corresponding charging gun on the first relay of on-off control
With the second relay, the power distributing unit further includes control module and the first optocoupler corresponding with each charging path detection
Circuit, the first optocoupler detection circuit include the first optocoupler and be connected to first optocoupler input terminal the first current limiter
Part, moreover,
The input terminal of the first optocoupler detection circuit by first relay and second relay with it is described
The power input of corresponding charging gun is in parallel；
The control module connects the output end of first optocoupler, and in the charging path being added online
The first relay and the second relay when being detected control described the in the state that corresponding power module remains turned-off
One relay, second relay are turned off or are closed, and according to the on-off of first optocoupler determine described first after
The health status of electric appliance and second relay.
It preferably, further include being arranged in each charging path and for carrying out the of on-off control to corresponding power module
Three relays, moreover,
The control module is also used to when detecting to the third relay in the charging path being added online,
In the state that first relay and second relay remain open, and the corresponding power module is opened, institute is controlled
It states third relay to turn off or be closed, and determines the healthy shape of the third relay according to the on-off of first optocoupler
State.
It preferably, further include the second optocoupler detection circuit corresponding with each charging path, the second optocoupler detection electricity
Road include the second optocoupler and be connected to second optocoupler input terminal the second current limiting device, moreover,
The input terminal of the second optocoupler detection circuit is in parallel to the power input of the corresponding charging gun；
The control module is also used to the first relay and in bypass relevant to the corresponding power module
When two relays carry out adhesion detection, in the state that the corresponding power module is opened and the third relay is closed, root
The health status of the first relay and the second relay in the bypass is determined according to the on-off of the second optocoupler in the bypass.
The present invention also constructs a kind of DC charging system, including at least two power modules and at least one charging gun, also
Including above-described power distributing unit.
The present invention also constructs a kind of online addition detection method of charging path, in the charging path being added online
When first relay and the second relay carry out adhesion detection, follow the steps below:
Step S101. controls corresponding power module and closes；
Step S102. controls the disconnection of one of relay in first relay and second relay, separately
One relay closure, wherein the first relay and the second relay are arranged in the charging path and are respectively used to phase
Two power inputs of inductive charging rifle carry out on-off control；
Step S103. detects whether the first optocoupler is connected, if so, thening follow the steps S104；If it is not, thening follow the steps
S105, wherein the first optocoupler detection circuit include the first optocoupler and be connected to first optocoupler input terminal the first current limliting
Device, moreover, the input terminal of the first optocoupler detection circuit passes through first relay and second relay and institute
The power input for stating corresponding charging gun is in parallel；
Step S104. determines that one of relay sticks together, and then executes step S108；
Step S105. controls another relay disconnection and one of relay closure；
Step S106. detects whether the first optocoupler is connected, if so, thening follow the steps S107；If it is not, thening follow the steps
S109；
Step S107. determines that another described relay sticks together；
Step S108. determines the charging path fail self-test；
Step S109. determines that first relay and second relay do not stick together.
Preferably, when carrying out adhesion detection to the third relay in the charging path being added online, following step is carried out
It is rapid:
Step S111. controls first relay and second relay disconnects；
Step S112. controls that the corresponding power module is opened and control third relay disconnects, wherein the third after
Electric appliance is arranged in the charging path and for carrying out on-off control to corresponding power module；
Step S113. detects whether the first optocoupler is connected, if so, thening follow the steps S114；If it is not, thening follow the steps
S115；
Step S114. determines that the third relay sticks together, and then executes step S108；
Step S115. determines that the third relay does not stick together.
Preferably, further includes:
Control the corresponding power module unlatching and third relay closure；
The strong of the first relay in the bypass and the second relay is determined according to the on-off of the second optocoupler in bypass
Health state, wherein the second optocoupler detection circuit include the second optocoupler and be connected to second optocoupler input terminal second limit
Device is flowed, moreover, the input terminal of the second optocoupler detection circuit is in parallel to the power input of the corresponding charging gun.
The present invention also constructs a kind of online Adding Way of charging path, to first in the charging path being added online
When relay and the second relay carry out driving failure detection, follow the steps below:
Step S201. controls corresponding power module and closes；
Step S202. controls first relay and second relay closure, wherein the first relay and second
Relay is arranged in the charging path and is respectively used to carry out on-off control to two power inputs of corresponding charging gun；
Step S203. detects whether the first optocoupler is connected, if it is not, thening follow the steps S204；If so, thening follow the steps
S205, wherein the first optocoupler detection circuit include the first optocoupler and be connected to first optocoupler input terminal the first current limliting
Device, moreover, the input terminal of the first optocoupler detection circuit passes through first relay and second relay and institute
The power input for stating corresponding charging gun is in parallel；
Step S204. determines that driving failure occurs at least one of first relay and second relay；
Step S205. determines that driving failure does not occur for first relay and second relay.
Preferably, when carrying out driving failure detection to the third relay in the charging path being added online, carry out with
Lower step:
Step S211. controls first relay and second relay disconnects；
Step S212. controls the corresponding power module and opens and control third relay closure, wherein the third after
Electric appliance is arranged in charging path and for carrying out on-off control to corresponding power module；
Step S213. detects whether the first optocoupler is connected, if so, thening follow the steps S214；If it is not, thening follow the steps
S215；
Step S214. determines that driving failure does not occur for the third relay；
Step S215. determines that driving failure occurs for the third relay.
Implement technical solution of the present invention, by the way that optocoupler detection circuit is arranged in each charging path, and controls mould
Corresponding relay is turned off or is closed in block control charging path, and corresponding relay then can be determined according to the on-off of optocoupler
The health status of device.It is strong that relay can be improved in the mode for needing to be AD converted sampled voltage processing compared to the prior art
The detection accuracy and shortening detection time of health state, improve effective charging time of user, promote the experience of user's charging.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the building-block of logic of DC charging system embodiment one of the present invention；
Fig. 2 is the part building-block of logic of power distributing unit embodiment one of the present invention；
Fig. 3 is the part building-block of logic of power distributing unit embodiment one of the present invention；
Fig. 4 is the part building-block of logic of power distributing unit embodiment one of the present invention；
Fig. 5 A is the flow chart of the online addition detection method embodiment one of charging path of the present invention；
Fig. 5 B is the flow chart of the online addition detection method embodiment two of charging path of the present invention；
Fig. 6 A is the flow chart of the online addition detection method example IV of charging path of the present invention；
Fig. 6 B is the flow chart of the online addition detection method embodiment five of charging path of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the building-block of logic of DC charging system embodiment one of the present invention, the DC charging system packet of the embodiment
Include N number of power module, M charging gun and power distributing unit 10, wherein N is natural number more than or equal to 2, M be more than or equal to
1 natural number.Moreover, power module is used to for direct current being converted into the required electric energy of electric car charging.Power distributing unit
10 include control module and M*N charging path, and relay there are three being respectively provided in each charging path, wherein first after
Electric appliance and the second relay are respectively used to carry out on-off control to two power inputs of corresponding charging gun, and third relay is used for
On-off control is carried out to corresponding power module.In addition, control module passes through BMS (battery management system) module with electric car
Charge power needed for communication obtains electric car, and the charging capacity of combined charge system and preset charging strategy determine
For the electric car distribution power module quantity, then, to the corresponding charging between charging gun and corresponding power module
Access carries out self-test, and opens the charging path by the relay being closed in corresponding charging path in self-test success, from
And it is electric car charging.
Fig. 2 is the part building-block of logic of power distributing unit embodiment one of the present invention, the power distribution list of the embodiment
Member includes 9 (M=3, N=3) a charging paths, in addition, further including control module (not shown), being arranged in each charging path
Three relays, the first optocoupler detection circuit corresponding with each charging path and the second optocoupler detection circuit, the first optocoupler
Detection circuit include the first optocoupler and be connected to the first optocoupler input terminal the first current limiting device (not shown), the second optocoupler inspection
Slowdown monitoring circuit include the second optocoupler and be connected to the second optocoupler input terminal the second current limiting device (not shown).Moreover, corresponding function
The positive output end of rate module connects the positive input terminal of corresponding charging gun by the first relay, and bearing for corresponding power module is defeated
Outlet connects the negative power input terminal of corresponding charging gun by third relay, the second relay, the first optocoupler detection circuit
Input terminal is in parallel with the power input of corresponding charging gun by the first relay and the second relay, the second optocoupler detection circuit
Input terminal it is in parallel with the power input of corresponding charging gun.It is logical with the charging that power module DC2 is charged by charging gun A
For road, in conjunction with Fig. 3, the first relay K2A+ and the second relay K2A- are respectively used to two power inputs to charging gun A
Carry out on-off control, third relay K2 be used for power module DC2 carry out on-off control, the first optocoupler be optocoupler U2, second
Optocoupler is optocoupler UA.In addition, be also parallel with IGBT pipe on third relay in each charging path, the characteristics of IGBT pipe is can
To bear high current, but the fever of its long-time super-high-current can cause to damage, so, in order to guarantee relay and IGBT pipe
Health status is used cooperatively using IGBT pipe and relay, needs to be led to according to certain constraint requirements when on-off in channel
It is disconnected.
Illustrate the structure of the charging path between power module DC2 and charging gun A below with reference to Fig. 2, Fig. 3 and Fig. 4: control
Module is preferably MCU101, and the first current limiting device includes first resistor R3 and second resistance R4, and the second current limiting device includes third
Resistance R11 and the 4th resistance R12.Moreover, the positive input terminal of the first optocoupler U2 passes sequentially through first resistor R3 the first relay of connection
The first end of device K2A+, the positive input terminal of the second end connection charging gun A of the first relay K2A+, the first optocoupler U2's is negative
Input terminal passes through the first end of the second relay of second resistance R4 connection K2A-, and the second end of the second relay K2A- connects charging
The negative power input terminal of rifle A.The positive input terminal of second optocoupler UA is inputted by the positive of 3rd resistor R11 connection charging gun A
End, the negative input end of the second optocoupler UA pass through the negative power input terminal of the 4th resistance R12 connection charging gun A.It should be understood that other fill
The structure of electric pathway can refer to the structure of the charging path, and this will not be repeated here.
In addition, in this embodiment, the output end of MCU101 the first optocoupler of connection and the output end of the second optocoupler, and be used for
To in the charging path being added online the first relay and the second relay detect when, corresponding power module keep
In the state of closing, the first relay of control, the second relay are turned off or are closed, and are determined according to the on-off of the first optocoupler
The health status of first relay and the second relay；Be also used to the third relay in the charging path being added online into
It when row detection, is remained open in the first relay and the second relay, and in the state of the unlatching of corresponding power module, controls third
Relay is turned off or is closed, and the health status of third relay is determined according to the on-off of the first optocoupler；It is also used to right
When the first relay and the second relay in bypass relevant to corresponding power module carry out adhesion detection, in corresponding power mould
Block is opened and in the state of third relay closure, determines the first relay in bypass according to the on-off of the second optocoupler in bypass
The health status of device and the second relay.Wherein, health status includes whether to stick together, driving failure whether occurs.
About charging path, it should be noted that, when having multiple electric cars while needing to charge, to improve charging effect
Rate need to guarantee that each electric car at least distributes a power module, therefore, carry out power module tune for the electric car
When spending, a power module can be distributed for the electric car first, that is, open first charging path.Moreover, open this
Before one charging path, due to being no-voltage between two power inputs of charging gun, so at this time in the charging path
The detection of the health status of relay is referred to as to start charging detection.When distributing a power module for each electric car
Afterwards, if there are also extra power module, the electric car can be continued as and distribute other power modules, that is, open it is online plus
The charging path entered.Moreover, before opening the charging path being added online, due between two power inputs of charging gun
There is voltage, is detected so being referred to as online be added to the detection of the health status of relay in the charging path at this time.
About the embodiment, it should be noted that, above is a specific example of the invention, certainly, in other realities
It applies in example, various modifications can be carried out to the structure of above embodiments, these deformations include: that (1) third relay is also attached to
The positive output end of power module, for example, the positive output end of power module DC2 passes through third relay K2, the first relay K2A+
The positive input terminal of charging gun A is connected, the negative output terminal of power module DC2 passes through the second relay K2A- connection charging gun A
Negative power input terminal.Alternatively, the 4th relay is arranged also in each charging path, and the 4th relay and third relay
It is separately positioned on the positive output end and negative output terminal of power module, and carries out the detection of health status to the 4th relay.(2)
First current limiting device can only include a resistance, when only including first resistor, for example, the positive input terminal of the first optocoupler U2 passes through
The negative input end of the first end of first resistor R3 the first relay of connection K2A+, the first optocoupler U2 connects the second relay K2A-'s
First end；When only including second resistance, for example, the positive input terminal of the first optocoupler U2 connects the first of the first relay K2A+
End, the negative input end of the first optocoupler U2 pass through the first end of the second relay of second resistance R4 connection K2A-.Similarly, the second limit
Flowing device can also only include a resistance, when only including 3rd resistor, for example, the positive input terminal of the second optocoupler UA passes through third
The positive input terminal of resistance R11 connection charging gun A, the negative power input of the negative input end connection charging gun A of the second optocoupler UA
End；When only including four resistance, for example, the positive input terminal of the positive input terminal connection charging gun A of the second optocoupler UA, second
The negative input end of optocoupler UA passes through the negative power input terminal of the 4th resistance R12 connection charging gun A.(3) in power distributing unit not
The second optocoupler detection circuit corresponding with each charging path is set.
Fig. 5 A is the flow chart of the online addition detection method embodiment one of charging path of the present invention, the embodiment it is online
Be added detection method be used for in the charging path being added online the first relay and the second relay carry out adhesion detection, and
Specifically includes the following steps:
Step S101. controls corresponding power module and closes；
Step S102. controls one of relay in the first relay and the second relay and disconnects, another relay
Device closure, wherein the first relay and the second relay be arranged in charging path and be respectively used to corresponding charging gun two
Power input carries out on-off control；
Step S103. detects whether the first optocoupler is connected, if so, thening follow the steps S104；If it is not, thening follow the steps
S105, wherein the first optocoupler detection circuit include the first optocoupler and be connected to the first optocoupler input terminal the first current limiting device,
Moreover, the input terminal of the first optocoupler detection circuit passes through the power input of the first relay and the second relay and corresponding charging gun
End is in parallel；
Step S104. determines that one of relay sticks together, and then executes step S108；
Step S105. controls the disconnection of another relay and one of relay closure；
Step S106. detects whether the first optocoupler is connected, if so, thening follow the steps S107；If it is not, thening follow the steps
S109；
Step S107. determines that another relay sticks together；
Step S108. determines charging path fail self-test；
Step S109. determines that the first relay and the second relay do not stick together.
Illustrate the adhesion testing principle of the first relay and the second relay in charging path below with reference to Fig. 2 to Fig. 4: false
If certain automobile is charged by charging gun A, the charging path between power module DC1 and charging gun A is first turned on, then
Determination also needs that power module DC2 is added online, at this point, need to carry out to the charging path between power module DC2 and charging gun A
Line be added detection, in the charging path the first relay K2A+ and the second relay K2A- carry out adhesion detection when,
MCU101 can close power module DC2, disconnect the first relay K2A+, be closed the second relay K2A-, and detect the first light
The on off operating mode of coupling U2, due to having voltage between two power input of charging gun A at this time, so, if the first optocoupler U2 is to lead
Logical state, then can determine that first relay K2A+ sticks together, on the contrary then do not stick together.Then, make in a like fashion,
The second relay K2A- is disconnected, is closed the first relay K2A+, and detect the on off operating mode of the first optocoupler U2, if conducting shape
State then can determine that second relay K2A- sticks together, on the contrary then do not stick together.
Fig. 5 B is the flow chart of the online addition detection method embodiment two of charging path of the present invention, the embodiment it is online
Detection method is added to be used to carry out adhesion detection to the third relay in the charging path being added online, and specifically includes following
Step:
Step S111. controls the first relay and the second relay disconnects；
Step S112. controls corresponding power module and opens and control the disconnection of third relay, wherein the setting of third relay
In charging path and for carrying out on-off control to corresponding power module；
Step S113. detects whether the first optocoupler is connected, if so, thening follow the steps S114；If it is not, thening follow the steps
S115；
Step S114. determines that third relay sticks together, and then executes step S108；
Step S115. determines that third relay does not stick together.
Illustrate the adhesion testing principle of third relay in charging path below with reference to Fig. 2 to Fig. 4: if certain automobile is passing through
When charging gun A is charged, the charging path between power module DC1 and charging gun A is first turned on, then determining need to also be
Power module DC2 is added in line, examines at this point, online be added need to be carried out to the charging path between power module DC2 and charging gun A
It surveys, when carrying out adhesion detection to the third relay K2 in the charging path, MCU101 can disconnect the first relay K2A+, the
Two relay K2A-, and power module DC2 unlatching is controlled, and control third relay K2 is disconnected, at this point, the first optocoupler U2 of detection
On off operating mode can determine that third relay K2 sticks together if the first optocoupler U2 is on state, it is on the contrary then do not occur
Adhesion.
Further, further includes:
Control the unlatching of corresponding power module and third relay closure；
The healthy shape of the first relay and the second relay in bypass is determined according to the on-off of the second optocoupler in bypass
State, wherein the second optocoupler detection circuit include the second optocoupler and be connected to the second optocoupler input terminal the second current limiting device, and
And second optocoupler detection circuit input terminal it is in parallel with the power input of corresponding charging gun.
Illustrate the adhesion testing principle of the first relay and the second relay in bypass below with reference to Fig. 2 to Fig. 4: if certain
Automobile is charged by charging gun A, if the charging path between power module DC1 and charging gun A need to be opened, in addition to this
It is outer that three relays K1A+, K1A-, K1 in charging path carry out adhesion detection, also need to power module DC1 respectively with charging
First relay K1B+, K1C+, second relay K1B-, K1C- in charging path between rifle B, C carry out adhesion detection, with
In the case where preventing from sticking together in bypass there are relay, because of mistaken touch charging gun B, C electric shock accidents occurs for people.Equally
Ground, when determining also needs that power module DC2 is added online, in addition to in the charging path between power module DC2 and charging gun A
Three relays K2A+, K2A-, K2 to carry out adhesion detection outer, also need to power module DC2 respectively between charging gun B, C
First relay K2B+, K2C+, second relay K2B-, K2C- in charging path carry out adhesion detection, to prevent from bypassing
In stick together there are relay in the case where, because of mistaken touch charging gun B, C electric shock accidents occurs for people.
Fig. 6 A is the flow chart of the online addition detection method example IV of charging path of the present invention, the embodiment it is online
Be added detection method be used for in the charging path being added online the first relay and the second relay carry out driving failure inspection
It surveys, and specifically includes the following steps:
Step S201. controls corresponding power module and closes；
Step S202. controls the first relay and the second relay closure, wherein the first relay and the second relay are set
It sets in charging path and is respectively used to carry out on-off control to two power inputs of corresponding charging gun；
Step S203. detects whether the first optocoupler is connected, if it is not, thening follow the steps S204；If so, thening follow the steps
S205, wherein the first optocoupler detection circuit include the first optocoupler and be connected to the first optocoupler input terminal the first current limiting device,
Moreover, the input terminal of the first optocoupler detection circuit passes through the power input of the first relay and the second relay and corresponding charging gun
End is in parallel；
Step S204. determines that driving failure occurs at least one of the first relay and the second relay；
Step S205. determines that driving failure does not occur for the first relay and the second relay.
Illustrate that the driving failure detection of the first relay and the second relay is former in charging path below with reference to Fig. 2 to Fig. 4
Reason: if certain automobile is charged by charging gun A, the charging first turned between power module DC1 and charging gun A is logical
Road, then determination also needs that power module DC2 is added online, at this point, need to be logical to the charging between power module DC2 and charging gun A
Road carry out it is online detection is added, in the charging path the first relay K2A+ and the second relay K2A- carry out driving mistake
When effect detection, MCU101 can close power module DC2, be closed the first relay K2A+ and the second relay K2A-, and detect
The on off operating mode of first optocoupler U2, due to having voltage between two power input of charging gun A at this time, so, if the first optocoupler
U2 is on state, then can determine the first relay K2A+ and the second relay K2A- do not occur driving failure, it is on the contrary then
Determine that driving failure occurs for the first relay K2A+ and/or the second relay K2A-.
Fig. 6 B is the flow chart of the online addition detection method embodiment five of charging path of the present invention, the embodiment it is online
Detection method is added for carrying out driving failure detection to the third relay in the charging path being added online, and specifically includes
Following steps:
Step S211. controls the first relay and the second relay disconnects；
Step S212. controls corresponding power module and opens and control third relay closure, wherein the setting of third relay
In charging path and for carrying out on-off control to corresponding power module；
Step S213. detects whether the first optocoupler is connected, if so, thening follow the steps S214；If it is not, thening follow the steps
S215；
Step S214. determines that driving failure does not occur for third relay；
Step S215. determines that driving failure occurs for third relay.
Illustrate the driving failure detection principle of third relay in charging path below with reference to Fig. 2 to Fig. 4: if certain automobile exists
When being charged by charging gun A, the charging path between power module DC1 and charging gun A has been first turned on, has then been determined also
Power module DC2 need to be added online, at this point, the charging path between power module DC2 and charging gun A need to be added online
Detection, when carrying out driving failure detection to the third relay K2 in the charging path, MCU101 can disconnect the first relay
K2A+, the second relay K2A-, and power module DC2 unlatching is controlled, and control third relay K2 closure, at this point, detection the
The on off operating mode of one optocoupler U2 can determine that driving does not occur and loses by third relay K2 if the first optocoupler U2 is on state
Effect, on the contrary it is then occur driving fail.
It is last it should be noted that, in process of self-test, if it is detected that relay adhesion occurs in charging path or driving is lost
The case where effect, power distributing unit can produce alarm signal, and maintenance personal can remove the power module on corresponding charging path
It goes out, before the problem of charging path repairs, which no longer comes into operation, and does not influence other power modules
Normal use.
Above disclosed is only presently preferred embodiments of the present invention, cannot limit right of the invention certainly with this
Range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to right of the present invention
Equivalent variations made by it is required that, still belongs to the scope covered by the invention.
Claims (9)
1. a kind of power distributing unit, including being arranged in each charging path and being respectively used to two power to corresponding charging gun
The first relay and the second relay of input terminal progress on-off control, which is characterized in that the power distributing unit further includes
Control module and the first optocoupler detection circuit corresponding with each charging path, the first optocoupler detection circuit include the first light
Coupling and be connected to first optocoupler input terminal the first current limiting device, moreover,
The input terminal of the first optocoupler detection circuit by first relay and second relay to it is described corresponding
The power input of charging gun is in parallel；
The control module, connects the output end of first optocoupler, and for the in the charging path being added online
When one relay and the second relay are detected, in the state that corresponding power module remains turned-off, control described first after
Electric appliance, second relay are turned off or are closed, and determine first relay according to the on-off of first optocoupler
With the health status of second relay.
2. power distributing unit according to claim 1, which is characterized in that further include be arranged in each charging path and
For carrying out the third relay of on-off control to corresponding power module, moreover,
The control module is also used to when detecting to the third relay in the charging path being added online, described
In the state that first relay and second relay remain open, and the corresponding power module is opened, described the is controlled
Three relays are turned off or are closed, and the health status of the third relay is determined according to the on-off of first optocoupler.
3. power distributing unit according to claim 2, which is characterized in that further include corresponding with each charging path
Two optocoupler detection circuits, the second optocoupler detection circuit include the second optocoupler and the input terminal for being connected to second optocoupler
Second current limiting device, moreover,
The input terminal of the second optocoupler detection circuit is in parallel to the power input of the corresponding charging gun；
The control module, be also used to in bypass relevant to the corresponding power module the first relay and second after
When electric appliance carries out adhesion detection, in the state that the corresponding power module is opened and the third relay is closed, according to institute
The on-off for stating the second optocoupler in bypass determines the health status of the first relay and the second relay in the bypass.
4. a kind of DC charging system, including at least two power modules and at least one charging gun, which is characterized in that further include
The described in any item power distributing units of claim 1-3.
5. a kind of online addition detection method of charging path, which is characterized in that in the charging path being added online
When one relay and the second relay carry out adhesion detection, follow the steps below:
Step S101. controls corresponding power module and closes；
Step S102. controls the disconnection of one of relay in first relay and second relay, another
Relay closure, wherein the first relay and the second relay are arranged in the charging path and are respectively used to accordingly filling
Two power inputs of electric rifle carry out on-off control；
Step S103. detects whether the first optocoupler is connected, if so, thening follow the steps S104；If it is not, S105 is thened follow the steps,
In, the first optocoupler detection circuit include the first optocoupler and be connected to first optocoupler input terminal the first current limiting device, and
And the input terminal of the first optocoupler detection circuit corresponding is filled by first relay and second relay to described
The power input of electric rifle is in parallel；
Step S104. determines that one of relay sticks together, and then executes step S108；
Step S105. controls another relay disconnection and one of relay closure；
Step S106. detects whether the first optocoupler is connected, if so, thening follow the steps S107；If it is not, thening follow the steps S109；
Step S107. determines that another described relay sticks together；
Step S108. determines the charging path fail self-test；
Step S109. determines that first relay and second relay do not stick together.
6. the online addition detection method of charging path according to claim 5, which is characterized in that being added online
When third relay in charging path carries out adhesion detection, follow the steps below:
Step S111. controls first relay and second relay disconnects；
Step S112. controls the corresponding power module and opens and control the disconnection of third relay, wherein the third relay
It is arranged in the charging path and for carrying out on-off control to corresponding power module；
Step S113. detects whether the first optocoupler is connected, if so, thening follow the steps S114；If it is not, thening follow the steps S115；
Step S114. determines that the third relay sticks together, and then executes step S108；
Step S115. determines that the third relay does not stick together.
7. the online addition detection method of charging path according to claim 6, which is characterized in that further include:
Control the corresponding power module unlatching and third relay closure；
The healthy shape of the first relay and the second relay in the bypass is determined according to the on-off of the second optocoupler in bypass
State, wherein the second optocoupler detection circuit include the second optocoupler and be connected to second optocoupler input terminal the second current limiter
Part, moreover, the input terminal of the second optocoupler detection circuit is in parallel to the power input of the corresponding charging gun.
8. a kind of online Adding Way of charging path, which is characterized in that first in the charging path being added online after
When electric appliance and the second relay carry out driving failure detection, follow the steps below:
Step S201. controls corresponding power module and closes；
Step S202. controls first relay and second relay closure, wherein the first relay and the second relay
Device is arranged in the charging path and is respectively used to carry out on-off control to two power inputs of corresponding charging gun；
Step S203. detects whether the first optocoupler is connected, if it is not, thening follow the steps S204；If so, S205 is thened follow the steps,
In, the first optocoupler detection circuit include the first optocoupler and be connected to first optocoupler input terminal the first current limiting device, and
And the input terminal of the first optocoupler detection circuit corresponding is filled by first relay and second relay to described
The power input of electric rifle is in parallel；
Step S204. determines that driving failure occurs at least one of first relay and second relay；
Step S205. determines that driving failure does not occur for first relay and second relay.
9. the online Adding Way of charging path according to claim 8, which is characterized in that in the charging to being added online
When third relay in access carries out driving failure detection, follow the steps below:
Step S211. controls first relay and second relay disconnects；
Step S212. controls the corresponding power module and opens and control third relay closure, wherein the third relay
It is arranged in charging path and for carrying out on-off control to corresponding power module；
Step S213. detects whether the first optocoupler is connected, if so, thening follow the steps S214；If it is not, thening follow the steps S215；
Step S214. determines that driving failure does not occur for the third relay；
Step S215. determines that driving failure occurs for the third relay.
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Address after: E206-2, R & D building, building e, HUanpu science and Technology Industrial Park, 211 tianguba Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Address before: 710065 R&D Building E206-2, E Building, No. 211 Tiangu Eighth Road, Xi'an High-tech Zone, Shaanxi Province Patentee before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. |
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