CN108982992B - Direct current charging system, PDU (Power distribution Unit) and online adding detection method of charging path - Google Patents
Direct current charging system, PDU (Power distribution Unit) and online adding detection method of charging path Download PDFInfo
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- CN108982992B CN108982992B CN201810575494.4A CN201810575494A CN108982992B CN 108982992 B CN108982992 B CN 108982992B CN 201810575494 A CN201810575494 A CN 201810575494A CN 108982992 B CN108982992 B CN 108982992B
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Abstract
The invention relates to a direct current charging system, a PDU (Power distribution Unit) and an online adding detection method of charging paths, wherein a power distribution unit comprises a control module and a first optical coupler detection circuit corresponding to each charging path, each first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, and the input end of each first optical coupler detection circuit is connected with the power input end of a corresponding charging gun in parallel through a first relay and a second relay; and the control module is used for controlling the first relay and the second relay to be disconnected or closed under the condition that the corresponding power module is kept closed when detecting the first relay and the second relay in the charging path added on line, and determining the health states of the first relay and the second relay according to the on-off state of the first optocoupler. By implementing the technical scheme of the invention, the detection precision of the health state of the relay can be improved, the detection time can be shortened, the effective charging time of a user can be improved, and the charging experience of the user can be improved.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a direct current charging system, a PDU (protocol data unit) and an online adding detection method of a charging path.
Background
Along with current electric automobile's rapid development, fill the emergence that electric pile also is like spring bamboo shoot after the rain, in order to satisfy a plurality of vehicles and accomplish simultaneously and high-efficiently charging, derive crowd charging system. In a charging system, a Power Distribution Unit (PDU) schedules power modules through control of one or more charging paths. The charging path is composed of some electronic devices such as relays and the like, and the components are easily damaged, such as adhesion or drive failure, so that the health condition of the relay in the charging path needs to be detected, and the safety problem is avoided.
At present, when detecting a relay in a charging path, the method adopted is as follows: and connecting IGBT tubes with higher current endurance grade in parallel on the relay, then performing AD conversion processing on a plurality of sampled voltage signals by controlling the on-off of the corresponding relay and the IGBT tubes, and judging whether the relay is reliable or not according to the relation among the processed voltage signals. However, this detection method has the following drawbacks: 1. the AD conversion processing of the sampling voltage is required, and the state detection precision of the relay is influenced by the ADC conversion precision; and 2, ADC conversion needs a long time and cannot meet the current practical requirement of quick charging.
Disclosure of Invention
In order to solve the technical problems of low detection precision and long detection time in the prior art, the invention provides a direct current charging system, a PDU (protocol data unit) and an online adding detection method of a charging channel, which can improve the detection precision and shorten the detection time.
The technical scheme adopted by the invention for solving the technical problems is as follows: a power distribution unit is constructed, comprising a first relay and a second relay which are arranged in each charging path and are respectively used for controlling the on-off of two power input ends of a corresponding charging gun, the power distribution unit further comprises a control module and a first optical coupler detection circuit corresponding to each charging path, the first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, furthermore,
the input end of the first optocoupler detection circuit is connected with the power input end of the corresponding charging gun in parallel through the first relay and the second relay;
the control module is connected with the output end of the first optocoupler, and is used for controlling the first relay and the second relay to be disconnected or closed under the condition that the corresponding power module is kept closed when detecting the first relay and the second relay in the online charging path, and determining the health state of the first relay and the second relay according to the on-off state of the first optocoupler.
Preferably, a third relay is further included, provided in each charging path, for on-off controlling the corresponding power module, and further,
the control module is further configured to, when detecting a third relay in a charging path added online, control the third relay to be turned off or turned on when the first relay and the second relay are kept off and the corresponding power module is turned on, and determine a health state of the third relay according to on/off of the first optocoupler.
Preferably, the charging system further comprises a second optical coupler detection circuit corresponding to each charging path, the second optical coupler detection circuit comprises a second optical coupler and a second current limiting device connected to an input end of the second optical coupler, and,
the input end of the second optocoupler detection circuit is connected with the power input end of the corresponding charging gun in parallel;
the control module is further used for determining the health states of the first relay and the second relay in the bypass according to the on-off state of the second optocoupler in the bypass when the corresponding power module is switched on and the third relay is switched off when adhesion detection is performed on the first relay and the second relay in the bypass related to the corresponding power module.
The invention also constructs a direct current charging system, which comprises at least two power modules and at least one charging gun, and also comprises the power distribution unit.
The invention also constructs an online charging detection method of the charging path, and when the first relay and the second relay in the online charging path are subjected to adhesion detection, the following steps are carried out:
s101, controlling a corresponding power module to be closed;
s102, controlling one relay of the first relay and the second relay to be switched off and the other relay to be switched on, wherein the first relay and the second relay are arranged in the charging path and are respectively used for controlling the on-off of two power input ends of corresponding charging guns;
s103, detecting whether the first optocoupler is conducted, if so, executing a step S104; if not, executing step S105, wherein a first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, and the input end of the first optical coupler detection circuit is connected in parallel with the power input end of the corresponding charging gun through the first relay and the second relay;
s104, determining that one relay is adhered, and then executing S108;
s105, controlling the other relay to be disconnected and one relay to be closed;
s106, detecting whether the first optocoupler is conducted, and if so, executing S107; if not, go to step S109;
s107, determining that the other relay is adhered;
s108, determining that the self-checking of the charging path fails;
and S109, determining that neither the first relay nor the second relay is adhered.
Preferably, when the third relay in the charging path added online is subjected to adhesion detection, the following steps are performed:
s111, controlling the first relay and the second relay to be disconnected;
s112, controlling the corresponding power module to be started and controlling a third relay to be disconnected, wherein the third relay is arranged in the charging path and is used for controlling the corresponding power module to be switched on and off;
step S113, detecting whether the first optocoupler is conducted, if so, executing step S114; if not, go to step S115;
s114, determining that the third relay is adhered, and then executing S108;
and S115, determining that the third relay is not adhered.
Preferably, the method further comprises the following steps:
controlling the corresponding power module to be opened and the third relay to be closed;
and determining the health states of a first relay and a second relay in the bypass according to the on-off state of a second optocoupler in the bypass, wherein a second optocoupler detection circuit comprises a second optocoupler and a second current limiting device connected to the input end of the second optocoupler, and the input end of the second optocoupler detection circuit is connected in parallel with the power input end of the corresponding charging gun.
The invention also constructs an online charging method of the charging path, and when the first relay and the second relay in the online charging path are subjected to drive failure detection, the following steps are carried out:
s201, controlling the corresponding power module to be closed;
s202, controlling the first relay and the second relay to be closed, wherein the first relay and the second relay are arranged in the charging path and are respectively used for controlling the on-off of two power input ends of the corresponding charging gun;
s203, detecting whether the first optocoupler is conducted, and if not, executing S204; if yes, executing step S205, where a first optocoupler detection circuit includes a first optocoupler and a first current limiting device connected to an input end of the first optocoupler, and an input end of the first optocoupler detection circuit is connected in parallel with a power input end of the corresponding charging gun through the first relay and the second relay;
s204, determining that at least one of the first relay and the second relay is in drive failure;
and S205, determining that the first relay and the second relay are not in driving failure.
Preferably, when detecting a drive failure of the third relay in the charging path added online, the following steps are performed:
s211, controlling the first relay and the second relay to be disconnected;
step S212, controlling the corresponding power module to be opened and controlling a third relay to be closed, wherein the third relay is arranged in a charging passage and is used for controlling the corresponding power module to be opened and closed;
step S213, detecting whether the first optocoupler is conducted, if so, executing step S214; if not, go to step S215;
step S214, determining that the third relay is not in driving failure;
and S215, determining that the third relay is in driving failure.
According to the technical scheme, the optical coupler detection circuit is arranged in each charging passage, the control module controls the corresponding relay in the charging passage to be switched on or switched off, and then the health state of the corresponding relay can be determined according to the on-off state of the optical coupler. Compared with the mode of carrying out AD conversion processing on the sampling voltage in the prior art, the method can improve the detection precision of the health state of the relay, shorten the detection time, improve the effective charging time of a user and improve the charging experience of the user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a logic structure diagram of a dc charging system according to a first embodiment of the present invention;
FIG. 2 is a partial logic structure diagram of a power distribution unit according to a first embodiment of the present invention;
FIG. 3 is a partial logic structure diagram of a power distribution unit according to a first embodiment of the present invention;
FIG. 4 is a partial logic structure diagram of a power distribution unit according to a first embodiment of the present invention;
FIG. 5A is a flowchart of a first embodiment of a method for online charging detection of a charging path according to the present invention;
FIG. 5B is a flowchart of a second embodiment of a charging path online joining detection method according to the present invention;
FIG. 6A is a flowchart of a fourth embodiment of a method for detecting online charging of a charging path according to the present invention;
fig. 6B is a flowchart of a fifth embodiment of the online charging detection method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a logic structure diagram of a dc charging system according to a first embodiment of the present invention, where the dc charging system includes N power modules, M charging guns, and a power distribution unit 10, where N is a natural number greater than or equal to 2, and M is a natural number greater than or equal to 1. And the power module is used for converting the direct current into electric energy required by charging the electric automobile. The power distribution unit 10 includes a control module and M × N charging paths, and each charging path is provided with three relays, where the first relay and the second relay are respectively used for on-off control of two power input ends of a corresponding charging gun, and the third relay is used for on-off control of a corresponding power module. In addition, the control module acquires charging power required by the electric vehicle through communication with a Battery Management System (BMS) module of the electric vehicle, determines the number of power modules distributed to the electric vehicle by combining the charging capacity of the charging system and a preset charging strategy, performs self-checking on a corresponding charging path between the charging gun and the corresponding power module, and opens the charging path by closing a relay in the corresponding charging path when the self-checking is successful, so as to charge the electric vehicle.
Fig. 2 is a partial logic structure diagram of a power distribution unit according to a first embodiment of the present invention, where the power distribution unit in this embodiment includes 9(M is 3, and N is 3) charging paths, and in addition, includes a control module (not shown), three relays disposed in each charging path, a first optical coupler detection circuit and a second optical coupler detection circuit corresponding to each charging path, where the first optical coupler detection circuit includes a first optical coupler and a first current limiting device (not shown) connected to an input end of the first optical coupler, and the second optical coupler detection circuit includes a second optical coupler and a second current limiting device (not shown) connected to an input end of the second optical coupler. And the positive output end of the corresponding power module is connected with the positive power input end of the corresponding charging gun through the first relay, the negative output end of the corresponding power module is connected with the negative power input end of the corresponding charging gun through the third relay and the second relay, the input end of the first optical coupling detection circuit is connected with the power input end of the corresponding charging gun in parallel through the first relay and the second relay, and the input end of the second optical coupling detection circuit is connected with the power input end of the corresponding charging gun in parallel. Taking a charging path that the power module DC2 is charged through the charging gun a as an example, with reference to fig. 3, the first relay K2A + and the second relay K2A-are respectively used for on-off control of two power input ends of the charging gun a, the third relay K2 is used for on-off control of the power module DC2, the first optical coupler is an optical coupler U2, and the second optical coupler is an optical coupler UA. In addition, an IGBT tube is connected in parallel to a third relay in each charging path, and the IGBT tube is characterized by being capable of bearing large current, but the large current is heated for a long time to cause damage, so that the IGBT tube and the relay are used in a matched mode to ensure the health state of the relay and the IGBT tube, and the channel needs to be switched on and off according to certain constraint requirements when the channel is switched on and off.
The structure of the charging path between the power module DC2 and the charging gun a is described below with reference to fig. 2, 3, and 4: the control module is preferably the MCU101, and the first current limiting device includes a first resistor R3 and a second resistor R4, and the second current limiting device includes a third resistor R11 and a fourth resistor R12. Moreover, the positive input end of the first optocoupler U2 is connected with the first end of the first relay K2A + sequentially through the first resistor R3, the second end of the first relay K2A + is connected with the positive power input end of the charging gun A, the negative input end of the first optocoupler U2 is connected with the first end of the second relay K2A-through the second resistor R4, and the second end of the second relay K2A-is connected with the negative power input end of the charging gun A. The positive input end of the second optical coupler UA is connected with the positive power input end of the charging gun A through a third resistor R11, and the negative input end of the second optical coupler UA is connected with the negative power input end of the charging gun A through a fourth resistor R12. It should be understood that the structure of the charging path may be referred to for other structures, and will not be described herein.
In addition, in this embodiment, the MCU101 is connected to the output end of the first optocoupler and the output end of the second optocoupler, and is configured to control the first relay and the second relay to be turned off or turned on when the first relay and the second relay in the charging path that is added online are detected, and determine the health status of the first relay and the second relay according to the on/off status of the first optocoupler; the charging circuit is also used for controlling the third relay to be switched off or switched on when the first relay and the second relay are kept switched off and the corresponding power module is switched on when detecting the third relay in the charging circuit which is added on line, and determining the health state of the third relay according to the on-off state of the first optocoupler; and the system is also used for determining the health states of the first relay and the second relay in the bypass according to the on-off state of a second optocoupler in the bypass when the corresponding power module is switched on and the third relay is switched off when the first relay and the second relay in the bypass related to the corresponding power module are subjected to adhesion detection. The health state comprises whether adhesion occurs or not and whether driving failure occurs or not.
Regarding the charging path, it should be further noted that, when a plurality of electric vehicles need to be charged simultaneously, in order to improve charging efficiency, at least one power module needs to be allocated to each electric vehicle, so when scheduling the power module for the electric vehicle, a power module may be allocated to the electric vehicle first, that is, the first charging path is opened. Before the first charging path is opened, since no voltage exists between the two power input ends of the charging gun, the detection of the health state of the relay in the charging path is called charging start detection. After each electric vehicle is allocated with one power module, if redundant power modules exist, other power modules can be continuously allocated to the electric vehicle, namely, an online charging path is opened. Before the charging path is opened, the voltage is existed between two power input ends of the charging gun, so the detection of the health state of the relay in the charging path is called online charging detection.
It should be noted that the above is only a specific example of the present invention, and of course, in other embodiments, various modifications may be made to the structure of the above embodiment, and these modifications include: (1) a third relay may also be connected to the positive output of the power module, for example, the positive output of the power module DC2 is connected to the positive power input of the charging gun a through the third relay K2, the first relay K2A +, and the negative output of the power module DC2 is connected to the negative power input of the charging gun a through the second relay K2A-. Or, a fourth relay is further arranged in each charging path, and the fourth relay and the third relay are respectively arranged at the positive output end and the negative output end of the power module, and the health state of the fourth relay is detected. (2) The first current limiting device may only include one resistor, and when only the first resistor is included, for example, the positive input terminal of the first optical coupler U2 is connected to the first terminal of the first relay K2A + through the first resistor R3, and the negative input terminal of the first optical coupler U2 is connected to the first terminal of the second relay K2A-; when only the second resistor is included, for example, the positive input end of the first optocoupler U2 is connected to the first end of the first relay K2A +, and the negative input end of the first optocoupler U2 is connected to the first end of the second relay K2A-through the second resistor R4. Similarly, the second current limiting device may also include only one resistor, and when only the third resistor is included, for example, the positive input end of the second optical coupler UA is connected to the positive power input end of the charging gun a through the third resistor R11, and the negative input end of the second optical coupler UA is connected to the negative power input end of the charging gun a; when only the fourth resistor is included, for example, the positive input end of the second optical coupler UA is connected to the positive power input end of the charging gun a, and the negative input end of the second optical coupler UA is connected to the negative power input end of the charging gun a through the fourth resistor R12. (3) And the power distribution unit is not provided with a second optical coupling detection circuit corresponding to each charging channel.
Fig. 5A is a flowchart of a first embodiment of a method for detecting online joining of a charging path according to the present invention, where the method for detecting online joining is used to perform adhesion detection on a first relay and a second relay in the charging path that is online joined, and specifically includes the following steps:
s101, controlling a corresponding power module to be closed;
s102, controlling one relay of a first relay and a second relay to be switched off and the other relay to be switched on, wherein the first relay and the second relay are arranged in a charging path and are respectively used for controlling the on-off of two power input ends of corresponding charging guns;
s103, detecting whether the first optocoupler is conducted, if so, executing a step S104; if not, executing step S105, wherein the first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, and the input end of the first optical coupler detection circuit is connected in parallel with the power input end of the corresponding charging gun through a first relay and a second relay;
s104, determining that one relay is adhered, and then executing S108;
s105, controlling the other relay to be disconnected and one relay to be closed;
s106, detecting whether the first optocoupler is conducted, and if so, executing S107; if not, go to step S109;
s107, determining that the other relay is adhered;
s108, determining that the self-checking of the charging path fails;
and S109, determining that neither the first relay nor the second relay is adhered.
The principle of adhesion detection of the first relay and the second relay in the charging path is described below with reference to fig. 2 to 4: if a certain automobile is charged through a charging gun A, a charging path between a power module DC1 and the charging gun A is firstly opened, then the fact that the power module DC2 needs to be added on line is determined, at the moment, the fact that the charging path between the power module DC2 and the charging gun A needs to be added on line is detected, when adhesion detection is conducted on a first relay K2A + and a second relay K2A-in the charging path, the MCU101 can close the power module DC2, disconnect the first relay K2A +, close the second relay K2A-, and detect the on-off state of a first optical coupler U2, due to the fact that voltage exists between two power input ends of the charging gun A at the moment, if the first optical coupler U2 is in a conducting state, it can be determined that the first relay K2A + is adhered, and otherwise, adhesion does not occur. Then, in the same manner, the second relay K2A "is opened, the first relay K2A + is closed, the on-off state of the first optocoupler U2 is detected, and if the on-off state is detected, it is determined that the second relay K2A" is stuck, otherwise, the sticking is not generated.
Fig. 5B is a flowchart of a second embodiment of the online joining detection method of the charging path according to the present invention, where the online joining detection method of the embodiment is used to perform adhesion detection on a third relay in the online joining charging path, and specifically includes the following steps:
s111, controlling the first relay and the second relay to be disconnected;
s112, controlling the corresponding power module to be started and controlling a third relay to be disconnected, wherein the third relay is arranged in the charging path and is used for controlling the corresponding power module to be switched on and off;
step S113, detecting whether the first optocoupler is conducted, if so, executing step S114; if not, go to step S115;
s114, determining that the third relay is adhered, and then executing S108;
and S115, determining that the third relay is not adhered.
The principle of detecting sticking of the third relay in the charging path is described below with reference to fig. 2 to 4: if a certain automobile is charged through the charging gun A, a charging path between the power module DC1 and the charging gun A is firstly opened, then the power module DC2 is determined to be added on line, at the moment, the charging path between the power module DC2 and the charging gun A needs to be added on line for detection, when the third relay K2 in the charging path is subjected to adhesion detection, the MCU101 can disconnect the first relay K2A + and the second relay K2A-, control the power module DC2 to be opened, control the third relay K2 to be disconnected, at the moment, the on-off state of the first optocoupler U2 is detected, if the first optocoupler U2 is in the on state, the third relay K2 can be determined to be adhered, and otherwise, the adhesion is not generated.
Further, still include:
controlling the corresponding power module to be opened and the third relay to be closed;
and determining the health states of a first relay and a second relay in the bypass according to the on-off state of a second optocoupler in the bypass, wherein the second optocoupler detection circuit comprises a second optocoupler and a second current limiting device connected at the input end of the second optocoupler, and the input end of the second optocoupler detection circuit is connected in parallel with the power input end of the corresponding charging gun.
The principle of adhesion detection of the first relay and the second relay in the bypass is described below with reference to fig. 2 to 4: if a certain car is charged by the charging gun a, if a charging path between the power module DC1 and the charging gun a needs to be opened, in addition to performing adhesion detection on the three relays K1A +, K1A-, and K1 in the charging path, adhesion detection needs to be performed on the first relays K1B +, K1C +, and the second relays K1B-, and K1C-in the charging path between the power module DC1 and the charging gun B, C, respectively, so as to prevent an electric shock accident caused by mistakenly touching the charging gun B, C when there is adhesion of the relays in the bypass. Similarly, when it is determined that the power module DC2 needs to be added online, in addition to performing adhesion detection on the three relays K2A +, K2A-, and K2 in the charging path between the power module DC2 and the charging gun a, adhesion detection on the first relay K2B +, K2C +, the second relay K2B-, and K2C-in the charging path between the power module DC2 and the charging gun B, C, respectively, is also needed to prevent a person from touching the charging gun B, C by mistake to cause an electric shock accident in the case that there is adhesion of relays in the bypass.
Fig. 6A is a flowchart of a fourth embodiment of the online joining detection method for a charging path according to the present invention, where the online joining detection method of the embodiment is used to perform drive failure detection on a first relay and a second relay in the online joining charging path, and specifically includes the following steps:
s201, controlling the corresponding power module to be closed;
s202, controlling a first relay and a second relay to be closed, wherein the first relay and the second relay are arranged in a charging path and are respectively used for controlling the on-off of two power input ends of a corresponding charging gun;
s203, detecting whether the first optocoupler is conducted, and if not, executing S204; if yes, executing step S205, wherein the first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, and the input end of the first optical coupler detection circuit is connected in parallel with the power input end of the corresponding charging gun through a first relay and a second relay;
s204, determining that at least one of the first relay and the second relay is in drive failure;
and S205, determining that the first relay and the second relay are not in driving failure.
The drive failure detection principle of the first relay and the second relay in the charging path is explained below with reference to fig. 2 to 4: if a car is charged by the charging gun a, the charging path between the power module DC1 and the charging gun a is first opened, then, the power module DC2 needs to be added online, at this time, the charging path between the power module DC2 and the charging gun A needs to be added online for detection, when the first relay K2A + and the second relay K2A-in the charging path are subjected to drive failure detection, the MCU101 can turn off the power module DC2, close the first relay K2A + and the second relay K2A-, and the on-off state of the first optocoupler U2 is detected, because voltage exists between the two power input ends of the charging gun A at the moment, therefore, if the first optocoupler U2 is in a conducting state, it is determined that the first relay K2A + and the second relay K2A-are not in a drive failure, and otherwise, it is determined that the first relay K2A + and/or the second relay K2A-are in a drive failure.
Fig. 6B is a flowchart of a fifth embodiment of the online joining detection method of the charging path according to the present invention, where the online joining detection method of the embodiment is used to perform drive failure detection on a third relay in the online joining charging path, and specifically includes the following steps:
s211, controlling the first relay and the second relay to be disconnected;
s212, controlling the corresponding power module to be opened and controlling a third relay to be closed, wherein the third relay is arranged in the charging passage and is used for controlling the corresponding power module to be opened and closed;
step S213, detecting whether the first optocoupler is conducted, if so, executing step S214; if not, go to step S215;
s214, determining that the third relay is not in driving failure;
and S215, determining that the third relay is in driving failure.
The drive failure detection principle of the third relay in the charging path is explained below with reference to fig. 2 to 4: if a certain automobile is charged through a charging gun A, a charging path between a power module DC1 and the charging gun A is firstly opened, then the fact that the power module DC2 needs to be added on line is determined, at the moment, the charging path between the power module DC2 and the charging gun A needs to be added on line for detection, when the third relay K2 in the charging path is subjected to drive failure detection, the MCU101 can disconnect the first relay K2A + and the second relay K2A-, control the power module DC2 to be opened, control the third relay K2 to be closed, at the moment, the on-off state of the first optocoupler U2 is detected, if the first optocoupler U2 is in the on state, it can be determined that the third relay K2 does not have drive failure, and otherwise, drive failure occurs.
Finally, it should be noted that, in the self-checking process, if the condition that the relay is adhered or the drive fails in the charging path is detected, the power distribution unit can generate an alarm signal, and a maintenance worker can peel off the power module on the corresponding charging path, so that the power module is not put into use any more before the problem of the charging path is repaired, and the normal use of other power modules is not influenced.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. A power distribution unit comprises a first relay and a second relay which are arranged in each charging path and are respectively used for controlling the on-off of two power input ends of a corresponding charging gun, and a third relay which is arranged in each charging path and is used for controlling the on-off of a corresponding power module, and is characterized in that the power distribution unit also comprises a control module, a first optical coupler detection circuit and a second optical coupler detection circuit which correspond to each charging path, wherein the first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, the second optical coupler detection circuit comprises a second optical coupler and a second current limiting device connected to the input end of the second optical coupler, and moreover,
the input end of the first optocoupler detection circuit is connected with the power input end of the corresponding charging gun in parallel through the first relay and the second relay;
the input end of the second optocoupler detection circuit is connected with the power input end of the corresponding charging gun in parallel;
the control module is connected with the output end of the first optocoupler, and is used for controlling the first relay and the second relay to be switched off or switched on under the condition that the corresponding power module is kept switched off when detecting the first relay and the second relay in the charging path added on line, and determining the health state of the first relay and the second relay according to the on-off state of the first optocoupler;
the control module is further used for determining the health states of the first relay and the second relay in the bypass according to the on-off state of the second optocoupler in the bypass when the corresponding power module is switched on and the third relay is switched off when adhesion detection is performed on the first relay and the second relay in the bypass related to the corresponding power module.
2. The power distribution unit of claim 1,
the control module is further configured to, when detecting a third relay in a charging path added online, control the third relay to be turned off or turned on when the first relay and the second relay are kept off and the corresponding power module is turned on, and determine a health state of the third relay according to on/off of the first optocoupler.
3. A dc charging system comprising at least two power modules and at least one charging gun, characterized in that it further comprises a power distribution unit according to any of claims 1-2.
4. The online charging detection method of the charging path is characterized in that the following steps are carried out when a first relay and a second relay in the online charging path are subjected to adhesion detection:
s101, controlling a corresponding power module to be closed;
s102, controlling one relay of the first relay and the second relay to be switched off and the other relay to be switched on, wherein the first relay and the second relay are arranged in the charging path and are respectively used for controlling the on-off of two power input ends of corresponding charging guns;
s103, detecting whether the first optocoupler is conducted, if so, executing a step S104; if not, executing step S105, wherein a first optical coupler detection circuit comprises a first optical coupler and a first current limiting device connected to the input end of the first optical coupler, and the input end of the first optical coupler detection circuit is connected in parallel with the power input end of the corresponding charging gun through the first relay and the second relay;
s104, determining that one relay is adhered, and then executing S108;
s105, controlling the other relay to be disconnected and one relay to be closed;
s106, detecting whether the first optocoupler is conducted, and if so, executing S107; if not, go to step S109;
s107, determining that the other relay is adhered;
s108, determining that the self-checking of the charging path fails;
s109, determining that neither the first relay nor the second relay is adhered;
the online joining detection method of the charging path further comprises the following steps:
controlling the corresponding power module to be opened and the third relay to be closed;
and determining the health states of a first relay and a second relay in the bypass according to the on-off state of a second optocoupler in the bypass, wherein a second optocoupler detection circuit comprises a second optocoupler and a second current limiting device connected to the input end of the second optocoupler, and the input end of the second optocoupler detection circuit is connected in parallel with the power input end of the corresponding charging gun.
5. The online charging detection method of the charging path according to claim 4, wherein the following steps are performed when the third relay in the online charging path is subjected to adhesion detection:
s111, controlling the first relay and the second relay to be disconnected;
s112, controlling the corresponding power module to be started and controlling a third relay to be disconnected, wherein the third relay is arranged in the charging path and is used for controlling the corresponding power module to be switched on and off;
step S113, detecting whether the first optocoupler is conducted, if so, executing step S114; if not, go to step S115;
s114, determining that the third relay is adhered, and then executing S108;
and S115, determining that the third relay is not adhered.
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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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