CN117104060A - Protection method and device for charging equipment, charging equipment and storage medium - Google Patents
Protection method and device for charging equipment, charging equipment and storage medium Download PDFInfo
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a protection method and device for charging equipment, the charging equipment and a storage medium, wherein the method comprises the following steps: acquiring charging current data of the charging equipment in a direct memory access mode; acquiring charging voltage data of the charging equipment in a direct memory access mode; if the charging current data is greater than the preset current data and/or the charging voltage data is greater than the preset voltage data; the control authority between the controller of the charging device and the contactor is acquired and the contactor is controlled to be opened. A large amount of charging current data and charging voltage data are acquired in real time in a direct memory reading mode, and abnormal voltage and current conditions can be efficiently monitored and responded under the condition that the operation load and the instantaneity of a controller of the charging equipment are not increased.
Description
Technical Field
The present application relates to the field of charging technologies, and in particular, to a protection method and apparatus for a charging device, and a storage medium.
Background
Under the development background of new energy electric vehicles advocated by China, as vehicles running by electric energy, charging equipment such as charging piles, charging piles and the like gradually become important traffic energy fusion infrastructure.
The current direct current charging equipment is widely popularized and used with the characteristics of quick and efficient charging, however, due to a certain technical gap between a vehicle enterprise and an enterprise for paving the charging equipment and a difference between the compatibility of the technologies between different vehicle enterprises and the enterprise for paving the charging equipment, safety accidents occur in the high-voltage heavy current charging process, the compatibility of charging safety and vehicle piles is still to be improved, and particularly, the direct current charging equipment products with flexible power distribution for charging multiple vehicles simultaneously are more likely to have abnormal conditions of heavy current or overvoltage charging in the charging process.
In the case of faults of the direct-current charger, the damage of overvoltage and heavy current is the largest, and generally, a general quick physical fuse device is built in a charging facility enterprise to convert short circuit into open circuit so as to realize protection. However, for the existing electric vehicles, the stock types are numerous, the charging current difference of different electric vehicles can be up to more than 10 times, the actual response speed and reliability of the universal fast physical fuse in the instantaneous heavy current protection application are relatively poor, and the phenomenon that the device in the electric vehicle is burnt but the built-in universal fast physical fuse of the charger does not act is frequent.
Disclosure of Invention
The application aims to solve the technical problem of improving the response speed and the safety of the charging equipment when abnormal charging occurs in the charging process.
One of the technical schemes adopted for solving the technical problems is as follows: a protection method for a charging device, the method comprising:
acquiring charging current data of the charging equipment in a direct memory access mode;
acquiring charging voltage data of the charging equipment in a direct memory access mode;
if the charging current data is greater than preset current data and/or the charging voltage data is greater than preset voltage data;
acquiring control authority between a controller of the charging equipment and the contactor, and controlling the contactor to be disconnected;
if the charging current data and the charging voltage data are zero, and the external output of the charging equipment is in a closed state;
the control authority between the controller of the charging device and the contactor is restored.
Further, the method for obtaining the charging current data of the charging device by means of direct memory access specifically comprises the following steps;
setting a first interrupt duration;
and acquiring n pieces of charging current data of the charging equipment at equal intervals in the interrupt duration by means of direct memory access.
Further, the method for obtaining charging voltage data of the charging device by means of direct memory access specifically includes the following steps:
setting a second interruption time length;
and acquiring m charging voltage data of the charging device at equal intervals in the interrupt duration in a direct memory access mode.
Further, if the charging current data is greater than a preset current data and/or the charging voltage data is greater than a preset voltage data; the control authority between the controller of the charging equipment and the contactor is obtained, and the contactor is controlled to be disconnected, and the method specifically comprises the following steps:
acquiring a plurality of preset voltage data and/or ranges of the preset voltage data, and acquiring delay protection time lengths corresponding to the ranges;
and if the charging current data and/or the charging voltage data are in any range, acquiring control authority between a controller of the charging equipment and the contactor after delay protection time corresponding to the range, and controlling the contactor to be disconnected.
Further, the method further comprises:
and storing and/or transmitting the obtained charging current data and/or charging voltage data.
The protection method for the charging equipment has the beneficial effects that: a large amount of charging current data and charging voltage data are acquired in real time in a direct memory reading mode, abnormal voltage and current conditions can be efficiently monitored and responded under the condition that the operation load and the instantaneity of a controller of the charging equipment are not increased, and the contactor is controlled to be disconnected, so that further damage to external electric equipment is timely avoided, and meanwhile, physical damage to the charging equipment is avoided. And after the abnormal condition is over, the control authority between the controller and the contactor of the charging equipment can be recovered, so that the charging equipment can continue to work normally.
The other technical scheme adopted for solving the technical problems is as follows: a protection device for a charging apparatus, the device comprising:
the current acquisition module acquires charging current data of the charging equipment in a direct memory access mode;
the voltage acquisition module acquires charging voltage data of the charging equipment in a direct memory access mode;
the detection control module is electrically connected with the relay, the detection control module is used for being electrically connected with a controller of the charging equipment, and the relay is used for being electrically connected with a contactor of the charging equipment;
if the charging current data acquired by the current acquisition module is greater than preset current data and/or the charging voltage data acquired by the voltage acquisition module is greater than preset voltage data;
the detection control module is used for acquiring control authority between a controller of the charging equipment and the contactor and controlling the contactor to be disconnected through the relay;
if the charging current data acquired by the current acquisition module and the charging voltage data acquired by the voltage acquisition module are zeroed, and the external output of the charging equipment is in a closed state;
the detection control module is used to restore control authority between the controller and the contactor of the charging device.
Further, the device further comprises a data storage module and/or a data transmission module, wherein the data storage module is used for storing the acquired charging current data and/or charging voltage data, and the data transmission module is used for transmitting the acquired charging current data and/or charging voltage data.
The protection device for the charging equipment has the beneficial effects that: the current acquisition module and the voltage acquisition module acquire a large amount of charging current data and charging voltage data in real time by using a high-speed analog-to-digital converter in a direct memory reading mode, can check abnormal voltage and current conditions occurring in the working process of the charging equipment in real time, and control short circuit of the charging equipment by using the detection control module and the relay, so that response speed and safety of the charging equipment in abnormal charging in the charging process are improved. In addition, the protection device can exist in an external module mode, and under the conditions of not affecting the functions of any existing charging equipment products and not modifying or sensing, the protection device is convenient to install and realize the protection functions of overcurrent, overvoltage and reverse prevention
The other technical scheme adopted for solving the technical problems is as follows: a charging device comprising a protection arrangement for a charging device as described above.
Further, the charging equipment further comprises a direct current bus, a shunt, a fuse and a contactor;
the current acquisition module is connected with the shunt in parallel;
the voltage acquisition module is connected with the direct current bus in parallel, one end of the voltage acquisition module is connected between the fuse and the contactor, and the other end of the voltage acquisition module is connected between the shunt and the contactor.
The charging equipment has the beneficial effects that: the charging equipment can have overcurrent, overvoltage and reverse-preventing protection functions, and the safety in the charging process is further improved.
One of the technical schemes adopted for solving the technical problems is as follows: a computer readable storage medium having stored thereon program instructions that when executed implement a protection method for a charging device as described above.
The beneficial effects of the computer readable storage medium of the application are that: a large amount of charging current data and charging voltage data are acquired in real time in a direct memory reading mode, abnormal voltage and current conditions can be efficiently monitored and responded under the condition that the operation load and the instantaneity of a controller of the charging equipment are not increased, and the contactor is controlled to be disconnected, so that further damage to external electric equipment is timely avoided, and meanwhile, physical damage to the charging equipment is avoided. And after the abnormal condition is over, the control authority between the controller and the contactor of the charging equipment can be recovered, so that the charging equipment can continue to work normally.
Drawings
The application will be further described with reference to the drawings and examples.
FIG. 1 is a schematic illustration of the connection between an off-board conductive charging device and a vehicle in accordance with the present application;
fig. 2 is a schematic diagram of a protection device for a charging apparatus according to the present application connected to the charging apparatus;
FIG. 3 is a graph showing time/current characteristics of a fuse of the present application;
FIG. 4 is a schematic diagram of the switching principle of the flexible power dynamic allocation matrix in the application;
FIG. 5 is a schematic diagram of the connection between charging devices when an overcurrent failure occurs in the parallel power module according to the present application;
FIG. 6 is a graph of current and voltage waveforms in accordance with the present application;
Detailed Description
The application is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the application easy to understand.
In one embodiment, the protection method for a charging device of the present application includes:
s1, acquiring charging current data of a charging device in a direct memory access mode; the charging device may be a device for discharging the charging pile, or the like. The charging current data can be obtained by a current acquisition module connected in parallel with a current divider of the charging equipment, and the current acquisition module can also perform conditioning, isolation, filtering and other treatments on the charging current data so as to improve the quality of the charging current data;
s2, acquiring charging voltage data of the charging equipment in a direct memory access mode; the charging voltage data can be obtained by a voltage acquisition module connected in parallel to a direct current bus of the charging equipment, and the voltage acquisition module can also perform conditioning, isolation, filtering and other treatments on the charging voltage data so as to improve the quality of the charging voltage data;
s3, if the charging current data is larger than preset current data and/or the charging voltage data is larger than preset voltage data;
acquiring control authority between a controller of the charging equipment and the contactor, and controlling the contactor to be disconnected;
s4, if the charging current data and the charging voltage data are zeroed, and the external output of the charging equipment is in a closed state;
the control authority between the controller of the charging device and the contactor is restored.
In some embodiments, in the step S1, the charging current data of the charging device is obtained by means of direct memory access, and specifically includes the following steps;
s11, setting a first interrupt duration;
s12, acquiring n pieces of charging current data of the charging equipment at equal intervals in the interrupt duration in a direct memory access mode.
The first interrupt duration can be set by comprehensively considering data calculation and transmission quantity, taking interrupt generation once every millisecond as an example, the first interrupt duration is 1 millisecond, 14 charging current data are acquired every millisecond, namely the acquisition interval time of each charging current data is 71 microseconds, the abnormal condition of the charging current can be acquired in real time through high-frequency acquisition of the charging current data, and the response speed in abnormal processing is further improved.
In some embodiments, in the step S2, the acquiring charging voltage data of the charging device by means of direct memory access specifically includes the following steps:
s21, setting a second interruption time length;
s22, m pieces of charging voltage data of the charging equipment are acquired at equal intervals in the interrupt duration in a direct memory access mode.
The second interruption time length can be set by comprehensively considering data calculation and transmission quantity, taking one interruption per millisecond as an example, the second interruption time length is 1 millisecond, 14 charging voltage data are collected per millisecond, namely, the collecting interval time of each charging voltage data is 71 microseconds, the abnormal condition of the charging voltage data can be obtained in real time through high-frequency collection of the charging voltage data, and the response speed in the abnormal processing is further improved.
In some embodiments, in the step S3, if the charging current data is greater than a preset current data and/or the charging voltage data is greater than a preset voltage data; the control authority between the controller of the charging equipment and the contactor is obtained, and the contactor is controlled to be disconnected, and the method specifically comprises the following steps:
s31, acquiring a plurality of preset voltage data and/or ranges of the preset voltage data, and acquiring delay protection duration corresponding to the ranges;
and S32, if the charging current data and/or the charging voltage data are in any range, acquiring control authority between a controller of the charging equipment and the contactor after delay protection duration corresponding to the range, and controlling the contactor to be disconnected.
The temporary small-amplitude current or voltage change possibly occurs sporadically in the working process of the charging equipment, and the electric equipment has certain tolerance capability to the temporary small-amplitude current or voltage change, so that if a single fixed numerical value is used as preset current data and/or preset voltage data, the charging equipment is frequently powered off, and therefore, the charging equipment can be protected by setting a plurality of preset voltage data and/or preset voltage data ranges, and different control logics are respectively endowed to the charging equipment according to the amplitude and duration of the current or voltage change, so that a better control effect is achieved.
In certain embodiments, the method further comprises:
and S5, storing and/or transmitting the charging current data and/or the charging voltage data acquired in the steps S1 and S2. The charging current data and/or the charging voltage data can be stored locally, and also can be transmitted to a background database for storage through a data transmission module
In one embodiment, the protection device for a charging device according to the present application includes:
the current acquisition module acquires charging current data of the charging equipment in a direct memory access mode; the current acquisition module can also perform conditioning, isolation, filtering and other treatments on the charging current data so as to improve the quality of the charging current data;
the voltage acquisition module acquires charging voltage data of the charging equipment in a direct memory access mode; the voltage acquisition module can also perform conditioning, isolation, filtering and other treatments on the charging voltage data so as to improve the quality of the charging voltage data;
the detection control module is electrically connected with the relay, the detection control module is used for being electrically connected with a controller of the charging equipment, and the relay is used for being electrically connected with a contactor of the charging equipment; the relay is preferably an SSR solid-state relay, the contactor can be an electromagnetic direct-current contactor, and the contactor can also be an SSR solid-state relay.
If the charging current data acquired by the current acquisition module is greater than preset current data and/or the charging voltage data acquired by the voltage acquisition module is greater than preset voltage data;
the detection control module is used for acquiring control authority between a controller of the charging equipment and the contactor and controlling the contactor to be disconnected through the relay;
if the charging current data acquired by the current acquisition module and the charging voltage data acquired by the voltage acquisition module are zeroed, and the external output of the charging equipment is in a closed state;
the detection control module is used to restore control authority between the controller and the contactor of the charging device.
In some embodiments, the apparatus further includes a data storage module and/or a data transmission module, where the data storage module is configured to store the obtained charging current data and/or the obtained charging voltage data, and the data transmission module is configured to transmit the obtained charging current data and/or the obtained charging voltage data. The data storage module can be a nonvolatile flash storage module and is used for temporarily storing charging current data and/or charging voltage data when network abnormality occurs in the charging process, and the data transmission module can be a wired network card or an infinite communication module such as 4G/5G/WIFI.
The working principle and the working method of the protection device for the charging device according to the present application may refer to the embodiments listed in the protection method for the charging device, and are not repeated herein.
In a certain embodiment, the charging device according to the application comprises a protection device for a charging device as described above.
In certain embodiments, the charging device further comprises a dc bus, a shunt, a fuse, and a contactor;
the current acquisition module is connected with the shunt in parallel;
the voltage acquisition module is connected with the direct current bus in parallel, one end of the voltage acquisition module is connected between the fuse and the contactor, and the other end of the voltage acquisition module is connected between the shunt and the contactor.
The working principle and the working method of the charging device according to the present application may be combined with the embodiments listed in the protection method for a charging device, and are not described herein.
In one embodiment, a computer readable storage medium of the present application has program instructions stored thereon, which when executed implement a protection method for a charging device as described above.
The working principle of implementing the protection method for a charging device according to the present application by the computer readable storage medium refers to the various embodiments listed in the protection method for a charging device, and will not be described herein.
The following are examples further described in connection with the methods, apparatus, and charging devices of the present application. The charging equipment is specifically a charging pile or a charging pile, and the electric equipment is specifically an electric automobile.
Fig. 1 is a schematic diagram of connection between an off-vehicle conductive charging device of an electric vehicle and a vehicle, wherein the off-vehicle conductive charging device is in accordance with the national standard of China, and a charging pile controller sequentially performs low-voltage auxiliary power supply electrification, charging handshake and charging parameter configuration after detecting that a charging gun is effectively inserted into a charging port of the vehicle, and a charging pile adjusts a rectifying module to output a corresponding value according to a required voltage and current provided by the vehicle to charge the vehicle. The charging pile comprises a rectifying module, a discharging loop, a charging pile controller, an auxiliary power supply and an IMD (in-mold digital) which refers to the maximum short-circuit current, and the maximum allowable current measured by the short-circuit of the positive electrode and the negative electrode is the maximum short-circuit current.
Fig. 2 is a schematic diagram of a protection device for a charging device connected to the charging device according to the present application, wherein two stages (if+ and IF-) of a current acquisition module are connected in parallel to a current divider of an original dc charging pile to acquire real-time charging current data, and two stages (bat+ and BAT-) of a voltage acquisition module are connected in parallel to a dc charging bus to monitor charging voltage in real time. The FUSE (F1 FUSE) is a general quick physical FUSE for the original charger.
Wherein fig. 3 is a graph of time/current characteristics of the fuse, wherein the horizontal axis is expected current and the vertical axis is pre-arc time (i.e., fuse response time), the graph shows that the fuse response time is 30 milliseconds when the charging current is 500A. The protection logic of some electric vehicles is that the vehicle is fused when the current exceeding 500A is detected for more than 10 milliseconds. According to fig. 6, when the electric car is charged with a rated current of 250A, the time before the arc of 1500A is longer than 1 second, and when a pulse high current is generated to the charging pile, the fuse cannot realize efficient and timely protection, and is more suitable for short-circuit overcurrent protection in the circuit.
In flexible dynamic power distribution charging device applications, complex dc contactor matrix switching is involved to achieve dynamic distribution of power modules, and the on-load switching voltage current value of the contactor is a major factor that severely affects contactor life, with typical life values of 1000 @135A/750V and 3000 @135A/450V. The sticking fault after the abnormality of the contactor is easy to generate circulation among vehicles when the charging equipment is charged simultaneously, and one group of power modules connected in parallel is too high in voltage, so that the vehicles are burnt out due to overcurrent.
In this embodiment, the case where the voltage of the parallel power supply module is too high is taken as an example for explanation. Fig. 4 is a schematic diagram of a typical flexible power dynamic allocation matrix switching principle, and a simplified description is given of the power supply module DC1 and the power supply module DC2, and the gun 1 and the gun 2. When the gun 2 is idle and the gun 1 charges an electric automobile, the gun 2 output direct current contactor KM-D2 is in an open state, if the electric automobile using the gun 1 requires more charging power than the power supply module DC1, the charging pile controller closes K7 and K8 in the figure 2, so that the electric automobile of the gun 1 is charged by the two groups of power supply modules DC1 and DC2 at the same time to improve charging power and speed; when K7 and K8 are sticky and cannot be segmented normally, under the condition that the gun 2 is connected with an electric vehicle to prepare for charging, the charging pile controller is closed KM-D2, if a large voltage difference exists between the electric vehicle of the gun 1 and the electric vehicle of the gun 2, an overcurrent fault occurs, and a circuit corresponding to the description is shown in fig. 5.
The voltage values listed in fig. 5 are all actual data that the present example normally controls to protect to the vehicle during use (both DC1 and DC2 in the figure represent non-single modules of the power module group that have been switched for use, here a simplified circuit for ease of description). In fig. 5, DC1 is used for normal charging of the electric automobile 1, the rectifying module provides 383.4V for vehicle demand voltage, 354.7V for vehicle actual voltage, 94A for detected charging current, and the equivalent internal resistance of the battery of the electric automobile 1 is about (383.4-354.7)/94 a= 0.3053 Ω; when it is detected that the electric automobile 2 needs to be charged, the charging controller immediately disconnects the K7 and the K8 to restore the DC2 module to the gun 2, adjusts the DC2 output according to the voltage required by the electric automobile 2 and simultaneously closes KM-D2 to carry out insulation detection, and detects that the DC2 module outputs 570V voltage to carry out insulation detection, at the moment, the K7 and the K8 are sticky and fail to be immediately disconnected, so that the DC1 and the DC2 are connected in parallel to charge the electric automobile 1, the instantaneous current is (570V-383.4V)/0.3053 omega=611A, the value exceeds the protection value with preset current data of 500A, and a detection control module (not shown in the figure) of the protection device (not shown in the figure) for the charging equipment cuts off the power supply output through a solid state relay SSR (not shown in the figure) and sends a warning and locks the gun.
Fig. 6 shows waveforms of the current and voltage collected during the above-mentioned overcurrent and protection process, wherein the maximum instantaneous current is 596.92a, and the overcurrent pulse is in total 26400-26329=71 points on the horizontal axis scale, and each point is 71 microseconds, i.e. 71 points from the detection of the overcurrent value to the complete disconnection of the loop are 71×71 us= 5.041mS (wherein the response time of the contactor used in the present embodiment is 4.5 mS).
Therefore, the protection method and the protection device for the charging equipment can realize overcurrent protection of the charging equipment, and have extremely high response speed and safety.
In addition, the protection method for the charging device and the protection device for the charging device of the application can also realize overvoltage detection and reverse charging protection for the charging device: as shown in fig. 2, the overvoltage detection and the overcurrent acquisition detection of the application have the same principle, and the data calculation and the transmission quantity are comprehensively considered to generate interruption once every millisecond, and 14 voltage/current points are acquired every millisecond, namely, the acquisition interval time of each point is 71 microseconds. The output voltage range of the charging equipment product is 200-1000V because of being compatible with various different types of electric automobiles, and more positive voltage abnormality is finally reflected in the overcurrent scene and realized in an overcurrent protection mode; the application has the same high-speed response as the overcurrent protection for the reverse protection of the battery polarity reverse connection and abnormal negative pulse voltage.
Furthermore, the protection method for a charging device and the protection apparatus for a charging device of the present application are also capable of achieving multi-stage current/voltage protection of the charging device: the protection method for the charging equipment can realize the setting of overcurrent and/or overvoltage values in a fixed mode and a dynamic mode and the corresponding delay protection. Taking a conventional non-liquid cooling charging device as an example, most charging device products limit the maximum charging current to 250A, the maximum normal instantaneous pulse current of a vehicle exceeding 240A charging current is within 270A according to the analysis of collected data, and taking a fixed type multistage protection as an example, the reference set values of the application are shown in the following table one:
list one
| Response class | Presetting a current data range | Time delay protection duration |
| 1 | 275-300A | 9mS |
| 2 | 301-325A | 8mS |
| 3 | 326-350A | 7mS |
| 4 | 351-375A | 6mS |
| 5 | 376-400A | 5mS |
| 6 | 401-425A | 4mS |
| 7 | 426-450A | 3mS |
| 8 | 451-475A | 2mS |
| 9 | 476-500A | 1mS |
| 10 | Greater than 501A | 0mS |
In addition, the protection method for the charging equipment and the protection device for the charging equipment can also realize the storage and transmission of charging current data and charging voltage data acquired by the charging equipment in real time, the charging current data and/or the charging voltage data in each charging process are compressed and transmitted to a background database for storage, and different sampling intervals (typical values of 200 ms-1S) can be configured according to the accuracy of data requirements of users, network bandwidth, server configuration and the like. Typical example values are maximum and minimum values taken out of 14 sets of data every millisecond, maximum and minimum values are taken out every 200ms in a rolling way, namely two data points of charging current data and charging voltage data are recorded every 200ms, 177 sets of data packets are divided into 2 channels/groups (voltage/current maximum/minimum value), 4 bytes/channel are added into a header, a tail is added into the channel, and 1460 bytes are used as a TCP packet to be sent to a background server through a socket for analysis and database storage. When network abnormality occurs in the charging process, data to be transmitted can be stored in the nonvolatile flash in the embodiment of the application for storage, and after the network is recovered, historical data can be actively reissued to a background server.
In addition, the protection method for the charging equipment and the protection device for the charging equipment can also realize the over-current and over-voltage self-recovery of the charging equipment: the protection method for the charging equipment and the protection device for the charging equipment detect that the charging current data and the charging voltage data are returned to zero, and the external output of the charging pile is in the closed state, namely after all the anomalies disappear and the charging machine exits from the current charging task, the control right of the charging pile controller to the direct current contactor is actively restored, and the next normal charging flow can be entered, namely the self-recovery unlocking is realized.
In summary, the protection method for the charging device and the protection device for the charging device can effectively protect the charging device from abnormal heavy current, overvoltage and the like. Compared with the protection method for the charging equipment and the protection device for the charging equipment, the protection method for the charging equipment and the protection device for the charging equipment have the advantages that the protection method for the charging equipment and the protection device for the charging equipment have higher speed and higher priority than the power-off protection before the self-destruction and the self-recovery can be carried out after a fault vehicle leaves the charging equipment compared with the electric vehicle, the charging safety in the field is effectively improved, the charging station turnover rate is improved, and the charging accident of the vehicle is restrained.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by hardware associated with a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided by the present application and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the foregoing examples, and that the foregoing description and description are merely illustrative of the principles of this application, and various changes and modifications may be made without departing from the spirit and scope of the application, which is defined in the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (10)
1. A protection method for a charging device, the method comprising:
acquiring charging current data of the charging equipment in a direct memory access mode;
acquiring charging voltage data of the charging equipment in a direct memory access mode;
if the charging current data is greater than preset current data and/or the charging voltage data is greater than preset voltage data;
acquiring control authority between a controller of the charging equipment and the contactor, and controlling the contactor to be disconnected;
if the charging current data and the charging voltage data are zero, and the external output of the charging equipment is in a closed state;
the control authority between the controller of the charging device and the contactor is restored.
2. The protection method for a charging device according to claim 1, wherein: the method for acquiring the charging current data of the charging equipment by a direct memory access mode comprises the following steps of;
setting a first interrupt duration;
and acquiring n pieces of charging current data of the charging equipment at equal intervals in the interrupt duration by means of direct memory access.
3. The protection method for a charging device according to claim 1, wherein: the method for acquiring the charging voltage data of the charging equipment by the direct memory access specifically comprises the following steps:
setting a second interruption time length;
and acquiring m charging voltage data of the charging device at equal intervals in the interrupt duration in a direct memory access mode.
4. The protection method for a charging device according to claim 1, wherein: if the charging current data is greater than preset current data and/or the charging voltage data is greater than preset voltage data; the control authority between the controller of the charging equipment and the contactor is obtained, and the contactor is controlled to be disconnected, and the method specifically comprises the following steps:
acquiring a plurality of preset voltage data and/or ranges of the preset voltage data, and acquiring delay protection time lengths corresponding to the ranges;
and if the charging current data and/or the charging voltage data are in any range, acquiring control authority between a controller of the charging equipment and the contactor after delay protection time corresponding to the range, and controlling the contactor to be disconnected.
5. The protection method for a charging device according to claim 1, wherein: the method further comprises the steps of:
and storing and/or transmitting the obtained charging current data and/or charging voltage data.
6. A protection device for a charging apparatus, characterized in that: the device comprises:
the current acquisition module acquires charging current data of the charging equipment in a direct memory access mode;
the voltage acquisition module acquires charging voltage data of the charging equipment in a direct memory access mode;
the detection control module is electrically connected with the relay, the detection control module is used for being electrically connected with a controller of the charging equipment, and the relay is used for being electrically connected with a contactor of the charging equipment;
if the charging current data acquired by the current acquisition module is greater than preset current data and/or the charging voltage data acquired by the voltage acquisition module is greater than preset voltage data;
the detection control module is used for acquiring control authority between a controller of the charging equipment and the contactor and controlling the contactor to be disconnected through the relay;
if the charging current data acquired by the current acquisition module and the charging voltage data acquired by the voltage acquisition module are zeroed, and the external output of the charging equipment is in a closed state;
the detection control module is used to restore control authority between the controller and the contactor of the charging device.
7. The protection device for a charging apparatus according to claim 6, wherein: the device also comprises a data storage module and/or a data transmission module, wherein the data storage module is used for storing the acquired charging current data and/or charging voltage data, and the data transmission module is used for transmitting the acquired charging current data and/or charging voltage data.
8. A charging device, characterized in that: the charging device comprises a protection arrangement for a charging device as claimed in claim 6 or claim 7.
9. The charging apparatus according to claim 8, wherein: the charging equipment further comprises a direct current bus, a current divider, a fuse and a contactor;
the current acquisition module is connected with the shunt in parallel;
the voltage acquisition module is connected with the direct current bus in parallel, one end of the voltage acquisition module is connected between the fuse and the contactor, and the other end of the voltage acquisition module is connected between the shunt and the contactor.
10. A computer-readable storage medium, characterized by: on which program instructions are stored which, when executed, implement the protection method for a charging device according to any of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310963238.3A CN117104060A (en) | 2023-08-02 | 2023-08-02 | Protection method and device for charging equipment, charging equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310963238.3A CN117104060A (en) | 2023-08-02 | 2023-08-02 | Protection method and device for charging equipment, charging equipment and storage medium |
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| CN202310963238.3A Pending CN117104060A (en) | 2023-08-02 | 2023-08-02 | Protection method and device for charging equipment, charging equipment and storage medium |
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