阅读说明：本技术 预充电装置、其控制方法和装置、存储介质和处理器 (Pre-charging device, control method and device thereof, storage medium and processor ) 是由 张景斐 倪晓鹤 韩裕汴 孙李璠 许凯 石玉柏 刘超岩 于 2020-05-21 设计创作，主要内容包括：本申请提供了一种预充电装置、其控制方法和装置、存储介质和处理器,该预充电装置包括高压输入端和主继电器,主继电器与高压输入端和预充电容分别电连接,预充电装置还包括：预备预充电路,与主继电器并联,预备预充电路包括至少一个并联的支路,任意一个支路包括至少一个预充继电器和至少一个预充电阻；检测模块,与预充电容电连接；控制模块,与检测模块通信连接,且与多个预充继电器以及主继电器分别电连接,用于根据电容量控制多个预充继电器的通断。上述预充电装置在预充电容的电容量大于或者等于预定电容量的情况下,断开主继电器和所有预充继电器,使得高压输入端无法对预充电容进行预充电,从而消除了预充电过程的安全隐患。(The application provides a pre-charging device, a control method and a device thereof, a storage medium and a processor, wherein the pre-charging device comprises a high-voltage input end and a main relay, the main relay is respectively and electrically connected with the high-voltage input end and a pre-charging capacitor, and the pre-charging device further comprises: the pre-charging circuit is connected with the main relay in parallel and comprises at least one branch circuit connected in parallel, and any branch circuit comprises at least one pre-charging relay and at least one pre-charging resistor; the detection module is electrically connected with the pre-charging capacitor; and the control module is in communication connection with the detection module, is respectively and electrically connected with the plurality of pre-charging relays and the main relay, and is used for controlling the on-off of the plurality of pre-charging relays according to the capacitance. According to the pre-charging device, the main relay and all the pre-charging relays are disconnected under the condition that the capacitance of the pre-charging capacitor is larger than or equal to the preset capacitance, so that the pre-charging capacitor cannot be pre-charged by the high-voltage input end, and the potential safety hazard in the pre-charging process is eliminated.)

1. The utility model provides a pre-charge device, its characterized in that, pre-charge device includes high voltage input and main relay, main relay with high voltage input and pre-charge electric capacity are connected respectively, pre-charge device still includes:

the pre-charging circuit is connected with the main relay in parallel and is used for providing pre-charging resistance for the pre-charging process of the pre-charging capacitor, the pre-charging circuit comprises at least one branch circuit which is connected in parallel, and any one branch circuit comprises at least one pre-charging relay and at least one pre-charging resistance;

the detection module is electrically connected with the pre-charging capacitor and used for detecting the capacitance of the pre-charging capacitor;

and the control module is in communication connection with the detection module, is respectively and electrically connected with the plurality of pre-charging relays and the main relay, and is used for controlling the on-off of the plurality of pre-charging relays according to the capacitance.

2. The pre-charging device according to claim 1, wherein the branch circuit comprises a first branch circuit comprising a first pre-charging resistor, a second pre-charging relay and a second pre-charging resistor connected in series in sequence.

3. The pre-charging device according to claim 2, wherein the branch circuit further comprises a second branch circuit, the second branch circuit comprises a first pre-charging relay, a third pre-charging relay and a third pre-charging resistor which are sequentially connected in series, a line between the first pre-charging relay and the second pre-charging relay is a first line, a line between the first pre-charging relay and the third pre-charging relay is a second line, and the first line is electrically connected with the second line.

4. The pre-charging device according to claim 1, wherein the pre-charging device comprises:

and the communication module is in communication connection with the control module and is used for sending alarm information under the condition that the capacitance is greater than or equal to a preset capacitance threshold value.

5. A control method of a precharge apparatus according to any one of claims 1 to 4, characterized by comprising:

acquiring the capacitance of the pre-charging capacitor;

determining a charging strategy in case the capacitance is smaller than a predetermined capacitance;

and controlling the pre-charging capacitor to be charged according to the charging strategy until the charging is finished.

6. The control method of claim 5, wherein the pre-charge device comprises a high voltage input and a main relay, the main relay is electrically connected with the high voltage input and a pre-charge capacitor, respectively, the pre-charge device further comprises a pre-charge circuit, the pre-charge circuit is connected with the main relay in parallel, the pre-charge circuit comprises at least one branch circuit connected in parallel, any one branch circuit comprises at least one pre-charge relay and at least one pre-charge resistor, and the control method further comprises:

and under the condition that the capacitance is larger than or equal to the preset capacitance, controlling the main relay to be switched off and controlling all the pre-charging relays to be switched off.

7. The control method according to claim 6, wherein there are at least two branches, and in case the capacitance is smaller than a predetermined capacitance, determining a charging strategy comprises:

calculating a resistance value range corresponding to a charging resistor of the pre-charging capacitor;

determining a series-parallel connection mode of the pre-charging resistor according to the resistance value range;

and determining the charging strategy according to the series-parallel connection mode.

8. The control method according to claim 7, wherein determining the series-parallel connection mode of the pre-charging resistor according to the resistance value range comprises:

calculating resistance values corresponding to all preparatory series-parallel connection modes, wherein the preparatory series-parallel connection modes are any series-parallel connection mode of the pre-charging resistors;

determining a minimum resistance value within the resistance value range according to a plurality of resistance values;

and determining the series-parallel connection mode of the pre-charging resistor as the series-parallel connection mode corresponding to the minimum resistance value.

9. The method of claim 7, wherein controlling the charging of the pre-charge capacitor according to the charging strategy comprises:

controlling the main relay to be switched off;

controlling the on-off of each pre-charging relay according to the series-parallel connection mode;

and controlling the high-voltage input end to charge the pre-charging capacitor.

10. The control method according to claim 5, characterized in that after charging is completed, the control method further comprises:

and controlling the main relay to be switched on.

11. The control method according to claim 6, characterized by further comprising:

and sending alarm information when the capacitance is larger than or equal to the preset capacitance.

12. A control device of a precharge device according to any one of claims 1 to 4, characterized by comprising:

the acquisition unit is used for acquiring the capacitance of the pre-charging capacitor;

a determination unit for determining a charging strategy in case the capacity is smaller than a predetermined capacity;

and the first control unit is used for controlling the charging of the pre-charging capacitor according to the charging strategy until the charging is finished.

13. A storage medium characterized by comprising a stored program, wherein the program executes the control method of any one of claims 5 to 11.

14. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the control method according to any one of claims 5 to 11 when running.

15. An electric vehicle comprising a pre-charging device and a control device, wherein the pre-charging device is the pre-charging device according to any one of claims 1 to 4, and the control device executes the control method according to any one of claims 5 to 11.

Technical Field

The application relates to the technical field of electric automobiles, in particular to a pre-charging device, a control method and device thereof, a storage medium, a processor and an electric automobile.

Background

In a pure electric vehicle, a plurality of parallel-connected large-capacity capacitors are generally arranged at a high-voltage input end of an upper motor controller, and the large-capacity capacitors are used for filtering and stabilizing input voltage. When the upper motor controller starts high-voltage electrifying operation, in order to reduce large-current impact and prevent impact current from damaging the high-voltage contactor and the fuse, a pre-charging circuit must be configured in a high-voltage output circuit of a chassis of the pure electric vehicle.

Disclosure of Invention

The application mainly aims to provide a pre-charging device, a control method and device thereof, a storage medium, a processor and an electric automobile, so as to solve the problem of potential safety hazard in the pre-charging process in the prior art.

According to an aspect of an embodiment of the present invention, there is provided a pre-charging apparatus including a high voltage input terminal and a main relay electrically connected to the high voltage input terminal and a pre-charging capacitor, respectively, the pre-charging apparatus further including: the pre-charging circuit is connected with the main relay in parallel and is used for providing pre-charging resistance for the pre-charging process of the pre-charging capacitor, the pre-charging circuit comprises at least one branch circuit which is connected in parallel, and any one branch circuit comprises at least one pre-charging relay and at least one pre-charging resistance; the detection module is electrically connected with the pre-charging capacitor and used for detecting the capacitance of the pre-charging capacitor; and the control module is in communication connection with the detection module, is respectively and electrically connected with the plurality of pre-charging relays and the main relay, and is used for controlling the on-off of the plurality of pre-charging relays according to the capacitance.

Optionally, the branch circuit includes a first branch circuit, and the first branch circuit includes a first pre-charge resistor, a second pre-charge relay, and a second pre-charge resistor, which are connected in series in sequence.

Optionally, the branch road still includes the second branch road, the second branch road includes first pre-charge relay, third pre-charge relay and the third pre-charge resistance that establishes ties in proper order, first pre-charge resistance with circuit between the second pre-charge relay is first circuit, first pre-charge relay with circuit between the third pre-charge relay is the second circuit, first circuit with the second circuit electricity is connected.

Optionally, the pre-charging device comprises: and the communication module is in communication connection with the control module and is used for sending alarm information under the condition that the capacitance is greater than or equal to a preset capacitance threshold value.

According to another aspect of the embodiments of the present invention, there is also provided a control method of a precharge device, the control method including: acquiring the capacitance of the pre-charging capacitor; determining a charging strategy in case the capacitance is smaller than a predetermined capacitance; and controlling the pre-charging capacitor to be charged according to the charging strategy until the charging is finished.

Optionally, the pre-charging device includes a high-voltage input terminal and a main relay, the main relay is electrically connected to the high-voltage input terminal and a pre-charging capacitor, respectively, the pre-charging device further includes a pre-charging circuit, the pre-charging circuit is connected in parallel to the main relay, the pre-charging circuit includes at least one branch circuit connected in parallel, any one of the branch circuits includes at least one pre-charging relay and at least one pre-charging resistor, and the control method further includes: and under the condition that the capacitance is larger than or equal to the preset capacitance, controlling the main relay to be switched off and controlling all the pre-charging relays to be switched off.

Optionally, the number of branches is at least two, and in case the capacitance is smaller than a predetermined capacitance, a charging strategy is determined, comprising: calculating a resistance value range corresponding to a charging resistor of the pre-charging capacitor; determining a series-parallel connection mode of the pre-charging resistor according to the resistance value range; and determining the charging strategy according to the series-parallel connection mode.

Optionally, determining a series-parallel connection mode of the pre-charging resistor according to the resistance value range includes: calculating resistance values corresponding to all preparatory series-parallel connection modes, wherein the preparatory series-parallel connection modes are any series-parallel connection mode of the pre-charging resistors; determining a minimum resistance value within the resistance value range according to a plurality of resistance values; and determining the series-parallel connection mode of the pre-charging resistor as the series-parallel connection mode corresponding to the minimum resistance value.

Optionally, controlling charging of the pre-charge capacitor according to the charging strategy includes: controlling the main relay to be switched off; controlling the on-off of each pre-charging relay according to the series-parallel connection mode; and controlling the high-voltage input end to charge the pre-charging capacitor.

Optionally, after the charging is completed, the control method further includes: and controlling the main relay to be switched on.

Optionally, the control method further includes: and sending alarm information when the capacitance is larger than or equal to the preset capacitance.

According to still another aspect of the embodiments of the present invention, there is also provided a control apparatus of a precharge apparatus, including: the acquisition unit is used for acquiring the capacitance of the pre-charging capacitor; a determination unit for determining a charging strategy in case the capacity is smaller than a predetermined capacity; and the first control unit is used for controlling the charging of the pre-charging capacitor according to the charging strategy until the charging is finished.

According to still another aspect of an embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program executes any one of the control methods.

According to another aspect of the embodiments of the present invention, there is also provided a processor, configured to execute a program, where the program executes any one of the control methods.

According to another aspect of the embodiments of the present invention, there is also provided an electric vehicle including a pre-charging device and a control device, the pre-charging device being any one of the pre-charging devices, the control device executing any one of the control methods.

In an embodiment of the present invention, in the pre-charging apparatus, the pre-charging circuit includes a plurality of branches connected in parallel, any one of the branches includes at least one pre-charging relay and at least one pre-charging resistor, the detection module detects a capacitance of the pre-charging capacitor, and the control module controls on/off of the plurality of pre-charging relays according to the capacitance, so that the main relay and all the pre-charging relays are turned off when the capacitance of the pre-charging capacitor is greater than or equal to a predetermined capacitance, so that the pre-charging capacitor cannot be pre-charged at the high-voltage input end, thereby avoiding overload of pre-charging current caused by an excessively large capacitance of the pre-charging capacitor, eliminating a safety hazard during the pre-charging process, and solving a problem of.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

fig. 1 shows a schematic view of a pre-charging arrangement according to an embodiment of the present application;

fig. 2 shows a flow chart of a control method of a pre-charging arrangement according to an embodiment of the present application; and

fig. 3 shows a schematic diagram of a control arrangement of a pre-charging arrangement according to an embodiment of the present application.

Wherein the figures include the following reference numerals:

10. a high voltage input; 20. a main relay; 30. pre-charging a capacitor; 40. a preliminary precharge circuit; 41. a first pre-charge resistor; 42. a second pre-charge relay; 43. a second pre-charge resistor; 44. a first pre-charge relay; 45. a third pre-charge relay; 46. a third pre-charge resistor; 50. a detection module; 60. a control module; 70. and a communication module.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

As mentioned in the background of the invention, in order to solve the above problems, a precharge apparatus, a control method and apparatus thereof, a storage medium, a processor, and an electric vehicle are provided in an exemplary embodiment of the present application.

According to an embodiment of the present application, there is provided a precharge device.

Fig. 1 is a schematic diagram of a pre-charging device according to an embodiment of the present application. As shown in fig. 1, the pre-charging device includes a high voltage input terminal 10 and a main relay 20, the main relay 20 is electrically connected to the high voltage input terminal 10 and a pre-charging capacitor 30, and the pre-charging device further includes:

a pre-charging circuit 40 connected in parallel with the main relay 20 for providing pre-charging resistance for the pre-charging process of the pre-charging capacitor 30, wherein the pre-charging circuit 40 includes at least one branch circuit connected in parallel, and any one of the branch circuits includes at least one pre-charging relay and at least one pre-charging resistance;

a detecting module 50 electrically connected to the pre-charge capacitor 30 for detecting the capacitance of the pre-charge capacitor 30;

and a control module 60 in communication with the detection module 50, wherein the control module 60 is electrically connected to the plurality of pre-charge relays and the main relay 20, respectively, and is configured to control on/off of the plurality of pre-charge relays according to the capacitance.

In the pre-charging device, the pre-charging circuit comprises a plurality of parallel branches, any branch comprises at least one pre-charging relay and at least one pre-charging resistor, the detection module detects the capacitance of the pre-charging capacitor, the control module controls the on-off of the pre-charging relays according to the capacitance, so that the main relay and all the pre-charging relays are disconnected under the condition that the capacitance of the pre-charging capacitor is larger than or equal to the preset capacitance, the high-voltage input end can not pre-charge the pre-charging capacitor, the phenomenon that the pre-charging current is overloaded due to the fact that the capacitance of the pre-charging capacitor is too large is avoided, the potential safety hazard in the pre-charging process is eliminated, and the problem that the potential.

In an embodiment of the present application, as shown in fig. 1, the branch circuit includes a first branch circuit, the first branch circuit includes a first pre-charge resistor 41, a second pre-charge relay 42 and a second pre-charge resistor 43 connected in series, and the second pre-charge relay 42 is electrically connected to the control module 60. Specifically, under the condition that the capacitance of the pre-charging capacitor is larger than or equal to the preset capacitance, the second pre-charging relay is controlled to be switched off through the control module, the first branch circuit can be switched off, so that the high-voltage input end cannot pre-charge the pre-charging capacitor, the circuit safety is ensured, of course, under the condition that the capacitance of the pre-charging capacitor is smaller than the preset capacitance, the second pre-charging relay is controlled to be switched on through the control module, the high-voltage input end charges the pre-charging capacitor through the first branch circuit, and the first pre-charging resistor and the second pre-charging resistor which are connected in series serve as the.

In an embodiment of the present invention, as shown in fig. 1, the branch circuit further includes a second branch circuit, the second branch circuit includes a first pre-charge relay 44, a third pre-charge relay 45 and a third pre-charge resistor 46, which are sequentially connected in series, a line between the first pre-charge resistor 41 and the second pre-charge relay 42 is a first line, a line between the first pre-charge relay 44 and the third pre-charge relay 45 is a second line, the first line is electrically connected to the second line, and the first pre-charge relay 44 and the third pre-charge relay 45 are respectively electrically connected to the control module 60. Specifically, under the condition that the capacitance of the pre-charging capacitor is larger than or equal to the preset capacitance, the control module controls the first pre-charging relay, the second pre-charging relay and the third pre-charging relay to be disconnected, so that the first branch circuit and the second branch circuit can be disconnected, the pre-charging of the pre-charging capacitor cannot be performed by the high-voltage input end, and the circuit safety is guaranteed.

It should be noted that, under the condition that the capacitance of the pre-charging capacitor is smaller than the predetermined capacitance, the control module controls the on/off of the first pre-charging relay, the second pre-charging relay and the third pre-charging relay, so that the series-parallel connection mode of the first pre-charging resistor, the second pre-charging resistor and the third pre-charging resistor can be adjusted to adjust the resistance of the pre-charging circuit, thereby reducing the resistance of the pre-charging circuit on the premise of avoiding overload of the pre-charging current, further reducing the charging time, improving the working timeliness of the pre-charging device, and improving the use experience.

In one embodiment of the present application, as shown in fig. 1, the pre-charging device includes a communication module 70, and the communication module 70 is communicatively connected to the control module 60 for sending an alarm message when the capacitance is greater than or equal to a predetermined capacitance threshold. Specifically, under the condition that the capacitance is larger than or equal to the preset capacitance threshold value, current overload easily occurs, the communication module sends alarm information to remind a user of potential safety hazards, appropriate pre-charging resistors are replaced timely, and safety of a pre-charging process is further improved.

The embodiment of the present application further provides a method for controlling a pre-charging device, and it should be noted that the method for controlling a pre-charging device according to the embodiment of the present application can be used for controlling the pre-charging device provided in the embodiment of the present application. The following describes a control method of a precharge device according to an embodiment of the present application.

Fig. 2 is a flowchart of a control method of a precharge device according to an embodiment of the present application. As shown in fig. 2, the control method includes:

step S101, acquiring the capacitance of a pre-charge capacitor;

step S102, determining a charging strategy under the condition that the capacitance is smaller than the preset capacitance;

step S103, controlling the pre-charge capacitor to be charged according to the charging strategy until the charging is completed.

In the control method, the capacitance of the pre-charging capacitor is obtained, the charging strategy is determined under the condition that the capacitance is smaller than the preset capacitance, and the pre-charging capacitor is controlled to be charged according to the charging strategy until the charging is finished. According to the method, the pre-charging capacitor is controlled to be charged according to the charging strategy only under the condition that the capacitance is smaller than the preset capacitance, namely, the pre-charging capacitor is not charged under the condition that the capacitance is larger than or equal to the preset capacitance, so that the phenomenon that pre-charging current is overloaded due to overlarge capacitance of the pre-charging capacitor is avoided, the potential safety hazard in the pre-charging process is eliminated, the charging time is reduced, the working timeliness of the pre-charging device is improved and the use experience is improved by determining the charging strategy.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.

In an embodiment of the present application, the pre-charging device includes a high voltage input terminal and a main relay, the main relay is electrically connected to the high voltage input terminal and a pre-charging capacitor, the pre-charging device further includes a pre-charging circuit, the pre-charging circuit is connected in parallel to the main relay, the pre-charging circuit includes at least one branch circuit connected in parallel, any one of the branch circuits includes at least one pre-charging relay and at least one pre-charging resistor, and the control method further includes: and controlling the main relay to be turned off and all the pre-charging relays to be turned off when the capacitance is greater than or equal to the predetermined capacitance. Specifically, the main relay is controlled to be disconnected, all the pre-charging relays are controlled to be disconnected, namely all the branches are disconnected, so that the pre-charging capacitor cannot be pre-charged by the high-voltage input end, the pre-charging current overload caused by the overlarge capacitance of the pre-charging capacitor is avoided, and the pre-charging safety is further ensured.

It should be noted that, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, the maximum value W of the pulse energy borne by the pre-charging resistor during the pre-charging process_maxIt is necessary to be less than the maximum value W of the pulse energy endured by the pre-charge resistor₀The calculation formula of the resistance pulse energy is as follows: w (t) ═ CU²e^-2t/RC) And/2, wherein t is time, C is capacitance, U is voltage when the charging of the capacitor is finished, R is charging resistance, and the maximum value W of pulse energy borne by the charging resistance in the charging process of the capacitor is calculated_max≈CU²/2, therefore, the precharge resistor of the preliminary precharge circuit withstands the maximum value W of the pulse energy₀Substituting the voltage U when the charging of the pre-charging capacitor is completed into the formula W_max≈CU²And/2, calculating to obtain the preset capacitance.

In one embodiment of the present application, the number of the branches is at least two, and in the case that the capacitance is smaller than the predetermined capacitance, the determining the charging strategy includes: calculating the resistance range corresponding to the charging resistor of the pre-charging capacitor; determining the series-parallel connection mode of the pre-charging resistor according to the resistance value range; and determining the charging strategy according to the series-parallel connection mode. In particular, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, it is also necessary to ensure the maximum value P of the instantaneous power borne by the pre-charging resistor during the pre-charging process_maxThe calculation formula of the resistance instantaneous power is less than the product of the preset resistance rated power and the overload coefficient, and is as follows: p (t) ═ U²e^-2t/RC) The maximum value P of the instantaneous power borne by the charging resistor in the capacitor charging process is calculated by calculating_max≈U²/R, so that the product of the predetermined resistance rating and the overload factor is taken as P_maxSubstituting the above formula to calculate the minimum resistance of the charging resistor, i.e. calculating the corresponding resistance range of the charging resistor of the pre-charging capacitor, according to the calculated resistance rangeThe resistance range finds out the series-parallel connection mode of the pre-charging resistor meeting the resistance range, and then the charging strategy is determined.

It should be noted that, since the series-parallel connection mode of the pre-charging resistors of the same branch is not changed, and the series-parallel connection mode of the pre-charging resistors of different branches changes with the on-off transmission of the pre-charging relay, the total resistance transmission of the preliminary pre-charging circuit changes, and therefore, when the preliminary pre-charging circuit is used as the pre-charging circuit to pre-charge the pre-charging capacitor, the change in the series-parallel connection mode of the pre-charging resistors changes the charging resistance of the pre-charging capacitor.

In an embodiment of the present application, determining a series-parallel connection mode of the pre-charge resistor according to the resistance value range includes: calculating resistance values corresponding to all prepared series-parallel connection modes, wherein the prepared series-parallel connection modes are any series-parallel connection modes of the pre-charging resistors; determining a minimum resistance value within the resistance value range according to a plurality of resistance values; and determining the series-parallel connection mode of the pre-charging resistor as the series-parallel connection mode corresponding to the minimum resistance value. Specifically, the capacitance charging time is calculated by the formula t ═ RCln [ U/(U-U)_t)]Wherein C is capacitance, U is voltage when charging of the capacitor is completed, and U is_tThe capacitor voltage at the time of charging t, R is a charging resistor, usually U_tWhen the charging time t is about 3RC, namely the capacitance of the preset capacitor is determined, the smaller the resistance value of the charging resistor R is, the smaller the charging time t is, therefore, the resistance value corresponding to the preparation series-parallel connection mode determines the minimum resistance value within the resistance value range, and the series-parallel connection mode corresponding to the minimum resistance value is adopted, so that the charging is shortest on the premise of ensuring the charging safety, the working timeliness of the pre-charging device is improved, and the use experience is improved.

In an embodiment of the present application, controlling the charging of the pre-charge capacitor according to the charging policy includes: controlling the main relay to be switched off; controlling the on-off of each pre-charging relay according to the series-parallel connection mode; and controlling the high-voltage input end to charge the pre-charging capacitor. Specifically, the on-off of each pre-charging relay is controlled according to the series-parallel connection mode, so that each preset resistor forms a pre-charging circuit according to an optimal series-parallel connection mode, the safety and timeliness of pre-charging are guaranteed, and the user experience is improved. For example, as shown in fig. 1, when the series-parallel connection mode is determined that the first pre-charge resistor 41 and the third pre-charge resistor 46 are connected in series, the first pre-charge relay 44 is controlled to be turned off, the second pre-charge relay 42 is controlled to be turned off, and the third pre-charge relay 45 is controlled to be turned on.

In an embodiment of the present application, after the charging is completed, the control method further includes: and controlling the main relay to be switched on. Specifically, after charging is completed, the pre-charging capacitor can filter and stabilize the input voltage of the high-voltage input end, the main relay is switched on to be powered on at high voltage, and the high-voltage contactor and the fuse of the upper motor controller can be prevented from being damaged by impact current.

In an embodiment of the present application, the control method further includes: and sending alarm information when the capacitance is larger than or equal to the preset capacitance. Specifically, under the condition that the capacitance is greater than or equal to the preset capacitance threshold value, current overload easily occurs, alarm information is sent to remind a user of potential safety hazards, and appropriate pre-charging resistors are replaced in time, so that the safety of the pre-charging process is further improved.

The embodiment of the present application further provides a control device of a pre-charging device, and it should be noted that the control device of the pre-charging device according to the embodiment of the present application can be used to execute the control method of the pre-charging device according to the embodiment of the present application. The following describes a control device of a precharge device according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a control device of a pre-charging device according to an embodiment of the present application, and as shown in fig. 3, the control device includes:

an obtaining unit 100 for obtaining a capacitance of the pre-charge capacitor;

a determination unit 200 for determining a charging strategy in case the above-mentioned capacity is smaller than a predetermined capacity;

the first control unit 300 is configured to control charging of the pre-charge capacitor according to the charging strategy until charging is completed.

In the control device, the obtaining unit obtains the capacitance of the pre-charging capacitor, the determining unit determines the charging strategy under the condition that the capacitance is smaller than the preset capacitance, and the control unit controls the pre-charging capacitor to be charged according to the charging strategy until the charging is completed. The control device controls the pre-charging capacitor to be charged according to the charging strategy only under the condition that the capacitance is smaller than the preset capacitance, namely, the pre-charging capacitor is not charged under the condition that the capacitance is larger than or equal to the preset capacitance, the phenomenon that the pre-charging current is overloaded due to the fact that the capacitance of the pre-charging capacitor is too large is avoided, the potential safety hazard in the pre-charging process is eliminated, the charging time is shortened through determining the charging strategy, the working timeliness of the pre-charging device is improved, and the use experience is improved.

In an embodiment of the present application, the control device further includes a second control unit, and the second control unit is configured to control the main relay to be turned off and control all the precharge relays to be turned off when the capacitance is greater than or equal to the predetermined capacitance. Specifically, the main relay is controlled to be disconnected, all the pre-charging relays are controlled to be disconnected, namely all the branches are disconnected, so that the pre-charging capacitor cannot be pre-charged by the high-voltage input end, the pre-charging current overload caused by the overlarge capacitance of the pre-charging capacitor is avoided, and the pre-charging safety is further ensured.

It should be noted that, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, the maximum value W of the pulse energy borne by the pre-charging resistor during the pre-charging process_maxIt is necessary to be less than the maximum value W of the pulse energy endured by the pre-charge resistor₀The calculation formula of the resistance pulse energy is as follows: w (t) ═ CU²e^-2t/RC) And/2, wherein t is time, C is capacitance, U is voltage when the charging of the capacitor is finished, R is charging resistance, and the maximum value W of pulse energy borne by the charging resistance in the charging process of the capacitor is calculated_max≈CU²/2, therefore, the precharge resistor of the preliminary precharge circuit withstands the maximum value W of the pulse energy₀Substituting the voltage U when the charging of the pre-charging capacitor is completed into the formula W_max≈CU²And/2, calculating to obtain the preset capacitance.

In an embodiment of the present application, the determining unit includes a calculating module, a first determining module and a second determining module, wherein the calculating module is configured to calculate a resistance range corresponding to a charging resistor of the pre-charging capacitor; the first determining module is used for determining the series-parallel connection mode of the pre-charging resistor according to the resistance value range; the second determining module is configured to determine the charging strategy according to the series-parallel connection manner. In particular, in order to prevent the pre-charging resistor from being burned out during the pre-charging process, it is also necessary to ensure the maximum value P of the instantaneous power borne by the pre-charging resistor during the pre-charging process_maxThe calculation formula of the resistance instantaneous power is less than the product of the preset resistance rated power and the overload coefficient, and is as follows: p (t) ═ U²e^-2t/RC) The maximum value P of the instantaneous power borne by the charging resistor in the capacitor charging process is calculated by calculating_max≈U²/R, so that the product of the predetermined resistance rating and the overload factor is taken as P_maxSubstituting the formula into the above formula to calculate the minimum resistance of the charging resistor, namely calculating the resistance range corresponding to the charging resistor of the pre-charging capacitor, so as to find out the series-parallel connection mode of the pre-charging resistor meeting the resistance range according to the resistance range, and further determine the charging strategy.

In an embodiment of the application, the first determining module includes a calculating submodule, a first determining submodule, and a second determining submodule, where the calculating submodule is configured to calculate resistance values corresponding to all preparatory series-parallel connection manners, and the preparatory series-parallel connection manner is any one of the series-parallel connection manners of the pre-charging resistors; the first determining submodule is used for determining a minimum resistance value in the resistance value range according to a plurality of resistance values; the second determining submodule is configured to determine that a series-parallel connection mode of the precharge resistor is a series-parallel connection mode corresponding to the minimum resistance value. Specifically, the capacitance charging time is calculated by the formula t ═ RCln [ U/(U-U)_t)]Wherein C is capacitance, U is voltage when charging of the capacitor is completed, and U is_tThe capacitor voltage at the time of charging t, R is a charging resistor, usually U_tWhen the charging time t is about 3RC, namely the capacitance of the preset capacitor is determined, the smaller the resistance value of the charging resistor R is, the smaller the charging time t is, therefore, the resistance value corresponding to the preparation series-parallel connection mode determines the minimum resistance value within the resistance value range, and the series-parallel connection mode corresponding to the minimum resistance value is adopted, so that the charging is shortest on the premise of ensuring the charging safety, the working timeliness of the pre-charging device is improved, and the use experience is improved.

In an embodiment of the present application, the first control unit includes a first control module, a second control module, and a third control module, where the first control module is configured to control the main relay to be turned off; the second control module is used for controlling the on-off of each pre-charging relay according to the series-parallel connection mode; the third control module is used for controlling the high-voltage input end to charge the pre-charging capacitor. Specifically, the on-off of each pre-charging relay is controlled according to the series-parallel connection mode, so that each preset resistor forms a pre-charging circuit according to an optimal series-parallel connection mode, the safety and timeliness of pre-charging are guaranteed, and the user experience is improved. For example, as shown in fig. 1, when the series-parallel connection mode is determined that the first pre-charge resistor 41 and the third pre-charge resistor 46 are connected in series, the first pre-charge relay 44 is controlled to be turned off, the second pre-charge relay 42 is controlled to be turned off, and the third pre-charge relay 45 is controlled to be turned on.

In an embodiment of the present application, the control device further includes a third control unit, and the third control unit is configured to control the main relay to be turned on after the charging is completed. Specifically, after charging is completed, the pre-charging capacitor can filter and stabilize the input voltage of the high-voltage input end, the main relay is switched on to be powered on at high voltage, and the high-voltage contactor and the fuse of the upper motor controller can be prevented from being damaged by impact current.

In an embodiment of the present application, the control method further includes: and sending alarm information when the capacitance is larger than or equal to the preset capacitance. Specifically, under the condition that the capacitance is greater than or equal to the preset capacitance threshold value, current overload easily occurs, alarm information is sent to remind a user of potential safety hazards, and appropriate pre-charging resistors are replaced in time, so that the safety of the pre-charging process is further improved.

The embodiment of the application also provides an electric vehicle, which comprises a pre-charging device and a control device, wherein the pre-charging device is any one of the pre-charging devices, and the control device executes any one of the control methods.

In the electric vehicle, the detection module acquires the capacitance of the pre-charging capacitor, the control module determines a charging strategy under the condition that the capacitance is smaller than the preset capacitance, and the control module controls the pre-charging capacitor to be charged according to the charging strategy until the charging is finished. Above-mentioned electric automobile only charges according to the strategy control that charges to the pre-charge electric capacity under the condition that the electric capacity is less than predetermined electric capacity, promptly under the condition that the electric capacity is greater than or equal to predetermined electric capacity, does not charge to the pre-charge electric capacity, has avoided the electric capacity of pre-charge electric capacity too big to lead to pre-charge to flow transship, thereby eliminated the potential safety hazard of pre-charge process, and through confirming the charging strategy, in order to reduce the charge time, promote the ageing of pre-charge device work, improve and use experience.

The control device of the pre-charging device comprises a processor and a memory, the acquisition unit, the determination unit, the first control unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and the problem of potential safety hazard in the pre-charging process in the prior art is solved by adjusting kernel parameters.

The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

An embodiment of the present invention provides a storage medium having a program stored thereon, where the program is executed by a processor to implement the control method of the precharge device.

An embodiment of the present invention provides a processor, where the processor is configured to execute a program, where the program executes a control method of the precharge device when the program is executed.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein when the processor executes the program, at least the following steps are realized:

step S101, acquiring the capacitance of a pre-charge capacitor;

step S102, determining a charging strategy under the condition that the capacitance is smaller than the preset capacitance;

step S103, controlling the pre-charge capacitor to be charged according to the charging strategy until the charging is completed.

The device herein may be a server, a PC, a PAD, a mobile phone, etc.

The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:

step S101, acquiring the capacitance of a pre-charge capacitor;

step S102, determining a charging strategy under the condition that the capacitance is smaller than the preset capacitance;

step S103, controlling the pre-charge capacitor to be charged according to the charging strategy until the charging is completed.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

1) in the pre-charging device of this application, prepare pre-charging circuit and include a plurality of parallelly connected branch roads, arbitrary one branch road includes at least one pre-charging relay and at least one pre-charging resistance, detection module detects the electric capacity of pre-charging capacitance, control module is according to the break-make of a plurality of pre-charging relays of electric capacity control, so that under the condition that the electric capacity of pre-charging capacitance is greater than or equal to predetermined electric capacity, disconnection main relay and all pre-charging relays, make high voltage input can't carry out the pre-charging to pre-charging capacitance, the electric capacity of having avoided pre-charging capacitance leads to pre-charging to flow to transship excessively, thereby the potential safety hazard of pre-charging process has been eliminated, the problem that there is.

2) In the control method, the capacitance of the pre-charging capacitor is obtained, a charging strategy is determined under the condition that the capacitance is smaller than the preset capacitance, and the pre-charging capacitor is controlled to be charged according to the charging strategy until the charging is finished. According to the method, the pre-charging capacitor is controlled to be charged according to the charging strategy only under the condition that the capacitance is smaller than the preset capacitance, namely, the pre-charging capacitor is not charged under the condition that the capacitance is larger than or equal to the preset capacitance, so that the phenomenon that pre-charging current is overloaded due to overlarge capacitance of the pre-charging capacitor is avoided, the potential safety hazard in the pre-charging process is eliminated, the charging time is reduced, the working timeliness of the pre-charging device is improved and the use experience is improved by determining the charging strategy.

3) In the control device, the obtaining unit obtains the capacitance of the pre-charging capacitor, the determining unit determines a charging strategy under the condition that the capacitance is smaller than the preset capacitance, and the control unit controls the pre-charging capacitor to be charged according to the charging strategy until the charging is completed. The control device controls the pre-charging capacitor to be charged according to the charging strategy only under the condition that the capacitance is smaller than the preset capacitance, namely, the pre-charging capacitor is not charged under the condition that the capacitance is larger than or equal to the preset capacitance, the phenomenon that the pre-charging current is overloaded due to the fact that the capacitance of the pre-charging capacitor is too large is avoided, the potential safety hazard in the pre-charging process is eliminated, the charging time is shortened through determining the charging strategy, the working timeliness of the pre-charging device is improved, and the use experience is improved.

4) In the electric automobile of this application, detection module acquires the electric capacity of pre-charge capacitor, and control module confirms the strategy of charging under the condition that the electric capacity is less than predetermined electric capacity, and control module charges to the pre-charge capacitor according to the strategy control of charging, and is accomplished until charging. Above-mentioned electric automobile only charges according to the strategy control that charges to the pre-charge electric capacity under the condition that the electric capacity is less than predetermined electric capacity, promptly under the condition that the electric capacity is greater than or equal to predetermined electric capacity, does not charge to the pre-charge electric capacity, has avoided the electric capacity of pre-charge electric capacity too big to lead to pre-charge to flow transship, thereby eliminated the potential safety hazard of pre-charge process, and through confirming the charging strategy, in order to reduce the charge time, promote the ageing of pre-charge device work, improve and use experience.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.