CN114583791A - Charging control method, device and system and storage medium - Google Patents
Charging control method, device and system and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The invention provides a charging control method, a device, a system and a storage medium, wherein the method is applied to a charging control module of a battery charging control system, and comprises the following steps: responding to a charging instruction sent by a battery control module, controlling a first charging branch circuit to charge according to the charging instruction, and receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch circuit is less than or equal to a first current; the first charging branch is closed in response to a first switching instruction sent by the battery control module, the boosting duty ratio is determined according to the switching frequency threshold value and the conduction time of a first switching tube contained in the boosting module in the second charging branch, the boosting charging instruction is generated according to the boosting duty ratio, the vehicle-mounted battery is boosted and charged according to the boosting charging instruction, and the charging efficiency of the electric vehicle is improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a charging control method, a charging control device, a charging control system and a storage medium.
Background
In order to improve the endurance mileage of the electric vehicle, the capacity of the battery pack of the electric vehicle is larger and larger, and the voltage level is higher and higher. However, the output voltage of the existing charging pile is low, and the charging requirement of the battery pack of the electric automobile cannot be met.
In order to solve the problem of low-voltage charging efficiency of the electric automobile, the electric automobile industry provides a vehicle-mounted boosting charging scheme, a vehicle-mounted boosting charging module is mounted on the electric automobile, the voltage of a charging pile is used for charging when charging is started, and after the voltage of a battery pack is increased, the vehicle-mounted boosting charging module is used for improving the charging voltage for boosting charging.
However, in the current national standard charging standard process, a standard charging switching process is provided, and the boosting charging can be switched to the charging only by manual operation, so that the automation degree is poor, and the charging efficiency of the electric automobile is influenced.
Disclosure of Invention
The invention provides a charging control method, a charging control device, a charging control system and a storage medium, and improves the charging efficiency of an electric automobile by providing a method for automatically switching to boost charging.
In a first aspect, the present invention provides a charging control method, which is applied to a charging control module of a battery charging control system, where the battery charging control system further includes a battery control module, a first charging branch and a second charging branch, where the second charging branch includes a voltage boosting module, where the voltage boosting module includes a first switch tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
responding to a charging instruction sent by a battery control module, and controlling a first charging branch circuit to charge a vehicle-mounted battery according to the charging instruction, wherein the charging instruction is generated by the battery control module according to a charging operation;
receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch is less than or equal to a first current;
and closing the first charging branch circuit in response to the first switching instruction, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch circuit, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch circuit to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In one possible design, the boosting module further includes a second switching tube, a boosting capacitor and a boosting inductor, a first end of the boosting inductor is connected to the charging pile, a second end of the boosting inductor is connected to a second end of the first switching tube and a first end of the second switching tube, a first end of the first switching tube is connected to a first end of the boosting capacitor and an anode of the vehicle-mounted battery, and a second end of the second switching tube is connected to the charging pile and is connected to a second end of the boosting capacitor and a cathode of the vehicle-mounted battery;
correspondingly, after the step-up charging command is generated according to the step-up duty ratio, the method further comprises the following steps:
and generating a boosting charging instruction according to the boosting duty ratio, and controlling the first switching tube, the second switching tube, the boosting capacitor and the boosting inductor to boost and charge the vehicle-mounted battery in response to the boosting charging instruction.
In one possible design, after the controlling the first switching tube, the second switching tube, the boost capacitor, and the boost inductor to boost and charge the vehicle-mounted battery, the method further includes:
determining an N +1 switching frequency according to a preset switching frequency increment and an nth switching frequency, determining an N +1 boosting duty cycle according to the N +1 switching frequency, and controlling a second charging branch circuit to perform boosting charging according to the N +1 boosting duty cycle, wherein N is a positive integer greater than 1;
and repeatedly executing the step of determining the (N + 1) th switching frequency according to the preset switching frequency increment and the nth switching frequency according to a preset time interval, determining the (N + 1) th boosting duty cycle according to the (N + 1) th switching frequency, and controlling a second charging branch circuit to perform the step of boosting charging according to the (N + 1) th boosting duty cycle until the (N + 1) th switching frequency is greater than or equal to the switching frequency threshold of the first switching tube.
In one possible design, before the turning off the first charging branch in response to the first switching instruction, the method further includes:
and if the charging current of the first charging branch is judged to be smaller than or equal to a second charging current, closing the first charging branch according to the first switching instruction, wherein the second charging current is the charging current threshold value of the first charging branch.
In a second aspect, the present invention provides a charging control method, applied to a battery control module of a battery charging control system, where the battery charging control system further includes a charging control module, a first charging branch and a second charging branch, where the second charging branch includes a voltage boost module, where the voltage boost module includes a first switching tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
generating a charging instruction in response to a charging operation, and sending the charging instruction to a charging control module so that the charging control module controls a first charging branch circuit to charge according to the charging instruction;
if the charging current in the first charging branch is smaller than or equal to the first current, a first switching instruction is generated, the first switching instruction is sent to the charging control module, the charging control module closes the first charging branch, a boosting duty ratio is determined according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch, a boosting charging instruction is generated according to the boosting duty ratio, and the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In one possible design, after the sending the first switching instruction to the charging control module, the method further includes:
if the charging current in the second charging branch is larger than zero and smaller than or equal to the charging current threshold, increasing the charging current of the second charging branch to the charging current threshold;
if the charging current of the second charging branch is larger than the charging current threshold, reducing the charging current of the second charging branch;
and if the charging current of the second charging branch circuit is equal to zero, closing the second charging branch circuit.
In one possible design, before the sending the first switching instruction to the charging control module, the method further includes:
reducing the charging current in the first charging branch according to the first switching instruction;
and if the charging current in the first charging branch is judged to be smaller than or equal to a second charging current, sending the first switching instruction to the charging control module, wherein the second charging current is the charging current threshold value of the first charging branch.
In a third aspect, the present invention provides a charging control device for a charging control module of a battery charging control system, including:
the control module is used for responding to a charging instruction sent by the battery control module and controlling the first charging branch to charge the vehicle-mounted battery according to the charging instruction, wherein the charging instruction is generated by the battery control module according to a charging operation;
the receiving module is used for receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch is less than or equal to a first current;
the switching module is used for responding to the first switching instruction to close the first charging branch, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube contained in a boosting module in the second charging branch, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In a fourth aspect, the present invention provides a charging control device applied to a battery control module of a battery charging control system, including:
the generating module is used for responding to a charging operation to generate a charging instruction and sending the charging instruction to the charging control module so that the charging control module controls the first charging branch circuit to charge according to the charging instruction;
the sending module is used for generating a first switching instruction if the charging current in the first charging branch is smaller than or equal to the first current, generating the first switching instruction, sending the first switching instruction to the charging control module, enabling the charging control module to close the first charging branch, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In a fifth aspect, the present invention provides a battery charge control system, comprising: the charging control module, the battery control module, the first charging branch and the second charging branch, wherein the second charging branch comprises a boosting module, and the boosting module comprises a first switching tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
the battery control module is used for generating a charging instruction according to the charging operation;
the charging control module is used for responding to the charging instruction to control the first charging branch circuit to carry out direct charging;
the battery control module is further used for generating a first switching instruction when the charging current in the first charging branch circuit is smaller than or equal to the first current;
the charging control module is further configured to close the first charging branch in response to a first switching instruction sent by the battery control module, determine a boosting duty ratio according to a switching frequency threshold value and a conduction time of a first switching tube included in a boosting module in the second charging branch, generate a boosting charging instruction according to the boosting duty ratio, and control the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In a sixth aspect, the invention provides an electric vehicle comprising the battery charging control system according to the fifth aspect.
In a seventh aspect, the present invention provides a controller, comprising: at least one processor and a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the charging control method as set forth in the first aspect and various possible designs of the first aspect, the second aspect, and various possible designs of the second aspect.
In an eighth aspect, the present invention provides a computer storage medium having stored thereon computer executable instructions that, when executed by a processor, implement the charging control method as set forth in the first aspect and in various possible designs of the first aspect, and in the second aspect and in various possible designs of the second aspect.
In a ninth aspect, the present invention provides a computer program product comprising a computer program which, when executed by a processor, implements a charging control method as set forth in the first aspect and in various possible designs of the first aspect, the second aspect and various possible designs of the second aspect.
According to the charging control method, the charging control device, the charging control system and the storage medium, when the charging current in the first charging branch is smaller than or equal to the first current, the second charging branch is switched to control the second charging branch to carry out boost charging, and the charging efficiency of the electric automobile is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery charging control system according to an embodiment of the present invention;
fig. 2 is a first flowchart illustrating a charging control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a charging control method according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a charging control method according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a charging control method according to a fourth embodiment of the present invention;
fig. 7 is a schematic flow chart of a charging control method according to an embodiment of the present invention;
fig. 8 is a first schematic structural diagram of a charging control device according to an embodiment of the present invention;
fig. 9 is a second schematic structural diagram of a charging control device according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a hardware structure of a controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the technical scheme of the disclosure, the collection, storage, use, processing, transmission, provision, disclosure and other processing of the personal information of the related user are all in accordance with the regulations of related laws and regulations and do not violate the good customs of the public order.
In order to solve the problem of low-voltage charging efficiency of the electric automobile, the electric automobile industry provides a vehicle-mounted boosting charging scheme, a vehicle-mounted boosting charging module is mounted on the electric automobile, the voltage of a charging pile is used for charging when charging is started, and after the voltage of a battery pack is increased, the vehicle-mounted boosting charging module is used for improving the charging voltage for boosting charging. However, in the current national standard charging standard process, a standard charging switching process is provided, and the boosting charging can be switched to the charging only by manual operation, so that the automation degree is poor, and the charging efficiency of the electric automobile is influenced.
In order to solve the above technical problem, the embodiment of the present invention proposes the following technical solutions: when the charging current in the first charging branch is smaller than or equal to the first current, the second charging branch is switched to control the second charging branch to perform boosting charging, and the charging efficiency of the electric automobile is improved. The following examples are given for illustrative purposes.
Fig. 1 is a schematic structural diagram of a battery charging control system according to an embodiment of the present invention. As shown in fig. 1, a battery charging control system according to an embodiment of the present invention includes a charging control module, a battery control module, a first charging branch and a second charging branch, where the second charging branch includes a voltage boosting module. The input end of the first charging branch is connected with the charging pile, and the output end of the first charging branch is connected with the vehicle-mounted battery; the input access of the second branch road that charges fills electric pile, and the output of the second branch road that charges is connected with the input of the module that steps up, and the output and the on-vehicle battery of the module that steps up are connected, contain first switch tube among the module that wherein steps up.
In the battery charging control system provided by the embodiment of the invention, after a charging pile of a battery control module of an electric vehicle completes information interaction required by national standards, the battery control module generates a charging instruction, and the charging control module controls a first charging branch circuit to directly charge according to the charging instruction; when the battery control module judges that the charging current in the first charging branch is smaller than or equal to the first current, the battery control module generates a first switching instruction, the charging control module closes the first charging branch according to the first switching instruction, the boosting duty ratio is determined according to the switching frequency threshold value and the conduction time of a first switching tube contained in the boosting module in the second charging branch, the boosting charging instruction is generated according to the boosting duty ratio, and the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
Fig. 2 is a first flowchart illustrating a charging control method according to an embodiment of the present invention, where an execution main body of the embodiment may be a charging control module in the battery charging control system shown in fig. 1, and the embodiment is not limited herein. As shown in fig. 2, the method includes:
s201: and responding to a charging instruction sent by the battery control module, and controlling the first charging branch circuit to charge the vehicle-mounted battery according to the charging instruction, wherein the charging instruction is generated by the battery control module according to the charging operation.
In the embodiment of the invention, after the electric automobile is plugged in the gun, the charging pile of the battery control module of the electric automobile completes information interaction required by national standards, and the battery control module generates the charging instruction. The charging control module controls the first charging branch circuit to directly charge according to the charging instruction, and at the moment, the charging voltage of the battery pack is the voltage of the charging pile. Illustratively, the charging voltage at this time is 720V.
S202: and receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch is less than or equal to the first current.
In the embodiment of the invention, the voltage of the battery pack is also increased continuously along with the increase of the electric quantity of the battery, when the voltage of the battery pack is increased to 750V, the charging current is reduced because the voltage of the charging pile is smaller than the voltage of the battery pack, and when the battery control module detects that the charging current in the first charging branch is smaller than or equal to the first current, the battery control module generates a first switching instruction to trigger switching. Illustratively, the magnitude of the first current is 95A.
S203: and closing the first charging branch circuit in response to the first switching instruction, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch circuit, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch circuit to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In the embodiment of the invention, when the charging current in the first charging branch is less than or equal to the first current, it is indicated that the voltage provided by the current charging pile cannot meet the charging requirement of the vehicle-mounted battery, the first charging branch can be closed, the second branch is controlled to start charging, and the vehicle-mounted battery is charged by using the boosting module. In order to reduce the current impact in the switching process, the first switching tube may be set to the maximum duty ratio according to a switching frequency threshold value of the first switching tube included in the voltage boosting module, that is, the minimum value of the switching frequency of the first switching tube, so that the current when the voltage boosting module starts to boost and charge is the minimum. Illustratively, a boosting duty ratio is determined according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch, a boosting charging instruction is generated according to the boosting duty ratio, and the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
For example, fig. 3 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention. In the charging circuit structure provided in fig. 3, the boost module further includes a second switch tube, a boost capacitor C and a boost inductor L, a first end C-1 of the boost inductor is connected to the charging pile, a second end L-2 of the boost inductor is connected to a second end of the first switch tube and a first end of the second switch tube, the first end of the first switch tube is connected to the first end C-1 of the boost capacitor and the anode of the vehicle-mounted battery, and the second end of the second switch tube is connected to the charging pile and is connected to the second end C-2 of the boost capacitor and the cathode of the vehicle-mounted battery. The first switch tube and the second switch tube are conducted complementarily.
In the embodiment of the present invention, when the charging control module turns off the first charging branch by turning off K1, and the charging current passes through the first switching tube of the voltage boost module and K2, and turns on the second charging branch, in order to reduce current impact during switching, the first switching tube in the second charging branch may be set to be turned on according to a maximum duty cycle, that is, a voltage boost duty cycle of the first switching tube in the second charging branch is determined according to a switching frequency of the first switching tube, and the charging branch is switched when the switching frequency of the first switching tube in the second charging branch is set to be a switching frequency threshold, where the switching frequency threshold is a minimum value of the switching frequency of the first switching tube, and exemplarily, the switching frequency of the first switching tube is 2000 hz. Illustratively, the duty cycle M is (1-T × F), where T1 is the first switching tube effective on-time. Illustratively, the effective conduction time of the first switch tube is related to the dead time, the turn-on time and the minimum conduction time of the first switch tube. In the embodiment of the present invention, when the switching frequency of the first switching tube is equal to the switching frequency threshold value of 2000hz, and the effective on-time of the first switching tube is 6us, the corresponding boost duty cycle M is 98.8%. The closer M is to 1, the smaller the current surge for switching.
According to the charging control method provided by the embodiment, when the charging current in the first charging branch is smaller than or equal to the first current, the first charging branch is switched to the second charging branch, the boosting duty ratio is determined according to the switching frequency threshold value and the conduction time of the first switching tube included in the boosting module in the second charging branch, the boosting charging instruction is generated according to the boosting duty ratio, the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction, and the charging efficiency of the electric vehicle is improved on the premise that the boosting charging safety is ensured.
Fig. 4 is a schematic flowchart of a charging control method according to an embodiment of the present invention. On the basis of the embodiment in fig. 2, after S203 controls the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boost charging command, as shown in fig. 4, the steps of another charging control method provided by the embodiment of the present invention are as follows:
s401: and determining the (N + 1) th switching frequency according to the preset switching frequency increment and the (N) th switching frequency, determining the (N + 1) th boosting duty cycle according to the (N + 1) th switching frequency, and controlling the second charging branch circuit to boost and charge according to the (N + 1) th boosting duty cycle, wherein N is a positive integer greater than 1.
In the embodiment of the invention, the charging efficiency corresponding to the switching frequency threshold value of the first switching tube is low, and after the step-up charging is switched, the duty ratio of the first switching tube can be slowly reduced by gradually increasing the switching frequency, so that the purpose of stably improving the charging efficiency is realized. Illustratively, the switching frequency threshold value of the first switching tube is 2000hz, the preset time interval is set to 10ms, the preset switching frequency increment is 1000hz, and then the setting is from 11ms to 20ms, and the second switching frequency is 1000hz +2000hz, which is 3000 hz; setting the third switching frequency to be 4000hz from 21ms to 30 ms; from 31ms to 40ms, the fourth switching frequency is set to 1000hz +5000hz to 6000 hz.
S402: and repeatedly executing the step S401 at preset time intervals until the N +1 switching frequency is greater than or equal to the switching frequency threshold of the first switching tube.
In the embodiment of the invention, after the switching frequency is gradually increased, the boosting duty ratio corresponding to each switching frequency is determined, and the second charging branch is controlled to perform boosting charging according to each reduced boosting duty ratio and a preset time interval. Illustratively, boost charging is performed from 0ms to 10ms according to a first boost duty ratio corresponding to a switching frequency threshold value of the first switching tube, boost charging is performed from 11ms to 20ms according to a second boost duty ratio corresponding to a second switching frequency, boost charging is performed from 21ms to 30ms according to a third boost duty ratio corresponding to a third switching frequency, and boost charging is performed from 31ms to 40ms according to a fourth boost duty ratio corresponding to a fourth switching frequency. And when the switching frequency is equal to the switching frequency threshold of the first switching tube, continuing to charge according to the duty ratio corresponding to the switching frequency threshold of the first switching tube. Illustratively, the switching frequency threshold of the first switching tube is 10000 hz.
In the embodiment of the invention, the switching frequency of the first switching tube is gradually increased until the switching frequency is increased to the switching frequency threshold, the switching frequency is stopped to be increased, and boosting charging is carried out according to the boosting duty ratio corresponding to the switching frequency threshold.
According to the charging control method provided by the embodiment, the switching frequency of the first switching tube in the second charging branch is gradually increased according to the preset time interval and the preset switching frequency increment, and the corresponding boosting duty ratio is determined according to each switching frequency, so that the duration of reducing the duty ratio is prolonged, and the switching stability is improved.
Fig. 5 is a third schematic flowchart of a charging control method according to an embodiment of the present invention, where an execution main body of the embodiment may be a battery control module in the battery charging control system shown in fig. 1. As shown in fig. 5, the method includes:
s501: and generating a charging instruction in response to the charging operation, and sending the charging instruction to the charging control module so that the charging control module controls the first charging branch circuit to charge according to the charging instruction.
In a possible implementation manner, if the magnitude of the charging current in the second charging branch is greater than zero and smaller than the charging current threshold, the charging current of the second charging branch is increased, and if the charging current of the second charging branch is greater than the charging current threshold, the charging current of the second charging branch is decreased; and if the charging current of the second charging branch circuit is equal to zero, closing the second charging branch circuit. The charging current threshold is the maximum charging current allowed by the second charging branch. The charging efficiency is improved by controlling the charging current of the second charging branch circuit to be at the maximum value allowed. And when the charging current of the second charging branch circuit is equal to zero, closing the second charging branch circuit and stopping charging.
S502: if the charging current in the first charging branch is smaller than or equal to the first current, a first switching instruction is generated, the first switching instruction is sent to the charging control module, the charging control module closes the first charging branch, the boosting duty ratio is determined according to the switching frequency threshold value and the conduction time of a first switching tube included in the boosting module in the second charging branch, the boosting charging instruction is generated according to the boosting duty ratio, and the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
The methods implemented in S501 to S502 are the same as the methods implemented in S201 to S203 in the embodiment of fig. 2, and the effects are not described herein again.
In a possible implementation manner, after the charging circuit is switched from the first charging branch to the second charging branch, on one hand, when the charging current in the second charging branch is greater than zero and less than or equal to a charging current threshold, in order to ensure charging efficiency, the charging current of the second charging branch may be increased to the charging current threshold for charging, where the charging current threshold is a maximum charging current that can be allowed by the second charging branch. On the other hand, when the charging current of the second charging branch is larger than the charging current threshold, the charging current of the second charging branch is reduced, and the charging fault caused by overlarge current is avoided. On the other hand, when the charging current of the second charging branch circuit is equal to zero, the second charging branch circuit is closed, and charging is stopped.
Fig. 6 is a fourth schematic flowchart of a charging control method according to an embodiment of the present invention. Before S503 sends the first switching instruction to the charging control module, as shown in fig. 6, the steps of another charging control method provided by the embodiment of the present invention are as follows:
s601: and reducing the charging current in the first charging branch according to the first switching instruction.
S602: and if the charging current in the first charging branch is judged to be smaller than or equal to a second charging current, sending a first switching instruction to the charging control module, wherein the second charging current is the charging current threshold value of the first charging branch.
In the embodiment of the invention, in the process of powering off the first charging branch and switching the charging current to the second charging branch, current impact caused by overlarge current in the first charging branch is avoided. Therefore, before switching, the charging current in the first charging branch is reduced according to the first switching instruction. Specifically, the charging current of the first charging branch is reduced to a safe range according to the preset current variation, that is, the charging current of the first charging branch is reduced to be lower than the second current. The second charging current is a charging current threshold value of the first charging branch circuit. Specifically, the charging current threshold is 10A.
In the embodiment of the invention, by reducing the charging current in the first charging branch to the charging current threshold value, in the process of powering off the first charging branch and switching the charging current to the second charging branch, the current in the first charging branch is overlarge to generate current impact, so that the safe switching to the boosting charging mode is ensured.
Fig. 7 is a schematic flowchart of a charging control method according to an embodiment of the present invention. As shown in fig. 7, the charging control method provided by the embodiment of the present invention includes the following steps:
s701: the battery control module generates a charging instruction according to the charging operation;
s702: the charging control module responds to the charging instruction to control the first charging branch circuit to carry out direct charging;
s703: the battery control module generates a first switching instruction when the charging current in the first charging branch circuit is less than or equal to the first current;
s704: the charging control module responds to a first switching instruction sent by the battery control module to close the first charging branch, determines a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube contained in a boosting module in the second charging branch, generates a boosting charging instruction according to the boosting duty ratio, and controls the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
The method implemented in S701 to S704 is consistent with the method implemented in S201 to S203 in the embodiment of fig. 2 and the effect thereof is not described herein again.
Fig. 8 is a first schematic structural diagram of a charging control device according to an embodiment of the present invention. As shown in fig. 8, the charge control device 80 includes: a control module 801, a receiving module 802, and a switching module 803.
The control module 801 is configured to, in response to a charging instruction sent by a battery control module, control a first charging branch to charge a vehicle-mounted battery according to the charging instruction, where the charging instruction is generated by the battery control module according to a charging operation;
a receiving module 802, configured to receive a first switching instruction returned by the battery control module, where the first switching instruction is generated when the battery control module determines that the charging current in the first charging branch is less than or equal to a first current;
the switching module 803 is configured to close the first charging branch in response to the first switching instruction, determine a boosting duty ratio according to a switching frequency threshold and a turn-on time of a first switching tube included in a boosting module in the second charging branch, generate a boosting charging instruction according to the boosting duty ratio, and control the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In a possible implementation manner, the boosting module further includes a second switching tube, a boosting capacitor, and a boosting inductor, the first end of the boosting inductor is connected to the charging pile, the second end of the boosting inductor is respectively connected with the second end of the first switch tube and the first end of the second switch tube, the first end of the first switch tube is respectively connected with the first end of the boosting capacitor and the anode of the vehicle-mounted battery, the second end of the second switch tube is connected with the charging pile, correspondingly, the switching module 803 is further configured to generate a boost charging instruction according to the boost duty cycle, and control the first switching tube, the second switching tube, the boost capacitor and the boost inductor to boost and charge the vehicle-mounted battery in response to the boost charging instruction.
In a possible implementation manner, the charging control apparatus 80 further includes an increasing module, configured to determine an N +1 th switching frequency according to a preset switching frequency increment and the nth switching frequency, determine an N +1 th boosting duty cycle according to the N +1 th switching frequency, and control the second charging branch to perform boosting charging according to the N +1 th boosting duty cycle and a preset time interval, where N is a positive integer greater than 1; and repeatedly executing the steps until the N +1 switching frequency is greater than or equal to the switching frequency threshold of the first switching tube.
Fig. 9 is a schematic structural diagram of a second charging control device according to an embodiment of the present invention. As shown in fig. 9, the charge control device 90 includes: a generating module 901 and a sending module 902.
The generating module 901 is configured to generate a charging instruction in response to a charging operation, and send the charging instruction to a charging control module, so that the charging control module controls a first charging branch to charge according to the charging instruction;
a sending module 902, configured to generate a first switching instruction if the charging current in the first charging branch is less than or equal to a first current, generate the first switching instruction, and send the first switching instruction to the charging control module, so that the charging control module closes the first charging branch, determine a boosting duty cycle according to a switching frequency threshold and a conduction time of a first switching tube included in a boosting module in the second charging branch, generate a boosting charging instruction according to the boosting duty cycle, and control the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
In a possible implementation manner, the charging control device 90 further includes a control module, configured to increase the charging current of the second charging branch to a charging current threshold if the charging current in the second charging branch is greater than zero, and less than or equal to a charging current threshold, and decrease the charging current of the second charging branch if the charging current of the second charging branch is greater than the charging current threshold; and if the charging current of the second charging branch circuit is equal to zero, closing the second charging branch circuit.
In a possible implementation manner, the charging control apparatus 90 further includes a decreasing module, configured to decrease the charging current in the first charging branch according to the first switching instruction; and if the charging current in the first charging branch is judged to be smaller than or equal to a second charging current, sending the first switching instruction to the charging control module, wherein the second charging current is the charging current threshold value of the first charging branch.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Fig. 10 is a schematic diagram of a hardware structure of a controller according to an embodiment of the present invention. As shown in fig. 10, the controller of the present embodiment includes: a processor 1001 and a memory 1002; wherein
A memory 1002 for storing computer-executable instructions;
Alternatively, the memory 1002 may be separate or integrated with the processor 1001.
When the memory 1002 is provided separately, the controller further includes a bus 1003 for connecting the memory 1002 and the processor 1001.
An embodiment of the present invention further provides a computer storage medium, where a computer execution instruction is stored in the computer storage medium, and when a processor executes the computer execution instruction, the charging control method is implemented as described above.
An embodiment of the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the charging control method as described above is implemented. An embodiment of the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the charging control method as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or 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, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in a controller or master device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A charging control method is characterized in that the charging control method is applied to a charging control module of a battery charging control system, the battery charging control system further comprises the battery control module, a first charging branch and a second charging branch, the second charging branch comprises a boosting module, and the boosting module comprises a first switch tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
responding to a charging instruction sent by a battery control module, and controlling a first charging branch circuit to charge a vehicle-mounted battery according to the charging instruction, wherein the charging instruction is generated by the battery control module according to a charging operation;
receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch is less than or equal to a first current;
and closing the first charging branch circuit in response to the first switching instruction, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch circuit, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch circuit to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
2. The method according to claim 1, wherein the boost module further comprises a second switching tube, a boost capacitor and a boost inductor, a first end of the boost inductor is connected to the charging pile, a second end of the boost inductor is connected to a second end of the first switching tube and a first end of the second switching tube, a first end of the first switching tube is connected to a first end of the boost capacitor and a positive electrode of a vehicle-mounted battery, and a second end of the second switching tube is connected to the charging pile and is connected to a second end of the boost capacitor and a negative electrode of the vehicle-mounted battery;
correspondingly, after the step-up charging command is generated according to the step-up duty ratio, the method further comprises the following steps:
and generating a boosting charging instruction according to the boosting duty ratio, and controlling the first switching tube, the second switching tube, the boosting capacitor and the boosting inductor to boost and charge the vehicle-mounted battery in response to the boosting charging instruction.
3. The method according to claim 2, further comprising, after said controlling said first switching tube, said second switching tube, said boost capacitor and said boost inductor to boost charge an on-board battery, the steps of:
determining an N +1 switching frequency according to a preset switching frequency increment and an Nth switching frequency, determining an N +1 boosting duty ratio according to the N +1 switching frequency, and controlling a second charging branch circuit to perform boosting charging according to the N +1 boosting duty ratio, wherein N is a positive integer greater than 1;
and repeatedly executing the steps of determining the (N + 1) th switching frequency according to the preset switching frequency increment and the nth switching frequency according to a preset time interval, determining the (N + 1) th boosting duty cycle according to the (N + 1) th switching frequency, and controlling a second charging branch circuit to perform boosting charging according to the (N + 1) th boosting duty cycle until the (N + 1) th switching frequency is greater than or equal to the switching frequency threshold of the first switching tube.
4. The method of claim 1, further comprising, prior to said shutting down the first charging leg in response to the first switching instruction:
and if the charging current of the first charging branch is judged to be smaller than or equal to a second charging current, the first charging branch is closed according to the first switching instruction, wherein the second charging current is the charging current threshold value of the first charging branch.
5. A charging control method is characterized in that the charging control method is applied to a battery control module of a battery charging control system, the battery charging control system further comprises the charging control module, a first charging branch and a second charging branch, the second charging branch comprises a boosting module, and the boosting module comprises a first switch tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
generating a charging instruction in response to a charging operation, and sending the charging instruction to a charging control module so that the charging control module controls a first charging branch circuit to charge according to the charging instruction;
if the charging current in the first charging branch is smaller than or equal to the first current, a first switching instruction is generated, the first switching instruction is sent to the charging control module, the charging control module closes the first charging branch, a boosting duty ratio is determined according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch, a boosting charging instruction is generated according to the boosting duty ratio, and the boosting module in the second charging branch is controlled to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
6. The method of claim 5, further comprising, after said sending the first switching instruction to the charging control module:
if the charging current in the second charging branch is larger than zero and smaller than or equal to the charging current threshold, increasing the charging current of the second charging branch to the charging current threshold;
if the charging current of the second charging branch is larger than the charging current threshold, reducing the charging current of the second charging branch;
and if the charging current of the second charging branch circuit is equal to zero, closing the second charging branch circuit.
7. The method of claim 5, further comprising, prior to said sending the first switching instruction to the charging control module:
reducing the charging current in the first charging branch according to the first switching instruction;
and if the charging current in the first charging branch is judged to be smaller than or equal to a second charging current, sending the first switching instruction to the charging control module, wherein the second charging current is the charging current threshold value of the first charging branch.
8. A charging control device is applied to a charging control module of a battery charging control system, and comprises:
the control module is used for responding to a charging instruction sent by the battery control module and controlling the first charging branch circuit to charge the vehicle-mounted battery according to the charging instruction, wherein the charging instruction is generated by the battery control module according to a charging operation;
the receiving module is used for receiving a first switching instruction returned by the battery control module, wherein the first switching instruction is generated when the battery control module judges that the charging current in the first charging branch is less than or equal to a first current;
and the switching module is used for responding to the first switching instruction to close the first charging branch, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube contained in a boosting module in the second charging branch, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
9. A charging control device is characterized in that a battery control module applied to a battery charging control system comprises:
the generating module is used for responding to a charging operation to generate a charging instruction and sending the charging instruction to the charging control module so that the charging control module controls the first charging branch circuit to charge according to the charging instruction;
the sending module is used for generating a first switching instruction if the charging current in the first charging branch is smaller than or equal to the first current, generating the first switching instruction, sending the first switching instruction to the charging control module, enabling the charging control module to close the first charging branch, determining a boosting duty ratio according to a switching frequency threshold value and conduction time of a first switching tube included in a boosting module in the second charging branch, generating a boosting charging instruction according to the boosting duty ratio, and controlling the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
10. A battery charge control system, comprising: the charging control module, the battery control module, the first charging branch and the second charging branch, wherein the second charging branch comprises a boosting module, and the boosting module comprises a first switching tube;
the input end of the first charging branch is connected with a charging pile, and the output end of the first charging branch is connected with a vehicle-mounted battery; the input end of the second charging branch is connected with the charging pile, the output end of the second charging branch is connected with the input end of the boosting module, and the output end of the boosting module is connected with the vehicle-mounted battery;
the battery control module is used for generating a charging instruction according to the charging operation;
the charging control module is used for responding to the charging instruction to control the first charging branch circuit to carry out direct charging;
the battery control module is further used for generating a first switching instruction when the charging current in the first charging branch circuit is smaller than or equal to the first current;
the charging control module is further configured to close the first charging branch in response to a first switching instruction sent by the battery control module, determine a boosting duty ratio according to a switching frequency threshold value and a conduction time of a first switching tube included in a boosting module in the second charging branch, generate a boosting charging instruction according to the boosting duty ratio, and control the boosting module in the second charging branch to boost and charge the vehicle-mounted battery according to the boosting charging instruction.
11. An electric vehicle characterized by comprising the battery charge control system according to claim 10.
12. A controller, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored by the memory causes the at least one processor to perform the charging control method of any of claims 1 to 4 or any of claims 5 to 7.
13. A computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement the charging control method of any one of claims 1 to 4 or any one of claims 5 to 7.
14. A computer program product comprising a computer program, wherein the computer program when executed by a processor implements the charge control method of any of claims 1 to 4 or any of claims 5 to 7.
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