Charging control adaptation method, system and equipment based on direct-current power supply

Abstract

The invention relates to the field of charging control, in particular to a charging control method, system and equipment based on a direct-current power supply. Judging whether the alternating-current mains supply is powered off or not, if yes, controlling the output voltage of the output end to be zero, periodically judging whether the alternating-current mains supply recovers power supply or not to obtain a power supply recovery judgment result, and if yes, controlling the output voltage to be equal to the current bus voltage and improving the output voltage according to a voltage stepping strategy; meanwhile, whether the equalized charging condition is met or not is judged, and if the equalized charging condition is met, the output voltage of the output end is controlled according to an equalized charging control strategy; according to the invention, the output voltage of the output end can be strictly controlled and the charging current value of the rechargeable battery can be monitored after the AC mains supply is recovered, the output voltage is gradually adjusted through a voltage stepping strategy, the overcurrent of the battery can be prevented, and a uniform charging mode or a floating charging mode can be timely adjusted according to the charging state. And the damage of overcharge to the rechargeable battery is reduced.

Description

Technical Field

[0001] The present invention relates to the field of charging control, and particularly to a charging control method, system and device based on a DC power supply. Background Art

[0002] In the prior art, in order to ensure the continuous operation of a device in the event of a power outage, a rechargeable battery and AC mains are usually used in combination to supply power to the device. When the AC mains is normally powered on, the charging module provides an output according to the floating charge voltage value to maintain the bus power supply and charge the battery. When the AC mains is powered off, the battery discharges to supply power to the bus to maintain the normal operation of the load. When the AC mains is restored again, it may be necessary for the charging module to provide an output according to the equalizing charge voltage value while charging the battery.

[0003] The above problems are that if the AC power outage lasts for too long, the battery will discharge more and the battery voltage will be too low. When the AC mains is restored, if the charging module directly outputs according to the equalizing charge voltage value, a large voltage difference will generate a relatively large battery charging current, and the excessive charging current will damage the battery, reducing the service life and safety of the battery. Therefore, the method for DC power supply charging control in the prior art has the problem of inflexible charging voltage control. Summary of the Invention

[0004] In view of the problems mentioned in the prior art, the present invention provides a charging control method, system and device based on a DC power supply, which solves the problem of inflexible charging voltage control in the method for DC power supply charging control in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a charging control method based on a DC power supply, including the following steps: The charging control method based on a DC power supply is applied to a charging control system and includes the following steps: S1. When the AC mains is powered off, the output voltage of the output end of the charging controller is zero to enable the rechargeable battery to enter the discharge mode; S2. Periodically judge the AC mains according to a preset judgment period to obtain a power supply restoration result; S3. Judge the power supply restoration result. If the power supply restoration result is negative, return to step S1; if the power supply restoration result is positive, control the output voltage of the output end of the charging controller to be equal to the current bus voltage; S4. Increase the output voltage of the output end of the charging controller according to a preset voltage stepping strategy, and judge whether the preset equalizing charge condition is satisfied according to the charging current value of the rechargeable battery; S5. If the equalizing charge condition is satisfied, control the output voltage at the output end of the charging controller according to the equalizing charge control strategy corresponding to the equalizing charge condition to charge the charging battery; if the equalizing charge condition is not satisfied, control the output voltage at the output end of the charging controller according to the preset floating charge control strategy to charge the charging battery.

[0006] As a further improvement of the present invention, in S4, increasing the output voltage at the output end of the charging controller according to the preset voltage step strategy includes: Determine the target output voltage according to the step voltage value in the voltage step strategy and the current output voltage at the output end of the charging controller; Determine the corresponding adjustment time point according to the adjustment period and the starting time point in the voltage step strategy, where The starting time point is the time point of the last output voltage adjustment or the starting time point of increasing the output voltage; When the adjustment time point is reached, adjust the output voltage value at the output end of the charging controller to the target output voltage.

[0007] As a further improvement of the present invention, in S4, judging whether the preset equalizing charge condition is satisfied according to the charging current value of the charging battery includes: Judge whether the charging current value of the charging battery is less than the charging current threshold value in the charging condition, and at the same time judge whether the output voltage at the output end of the charging controller is less than the preset equalizing charge voltage; If the charging current value is less than the charging current threshold value and the output voltage at the output end of the charging controller is less than the equalizing charge voltage, then execute the process of increasing the output voltage at the output end of the charging controller according to the preset voltage step strategy again; If the charging current value is not less than the charging current threshold value, it is determined that the equalizing charge condition is satisfied; If the output voltage at the output end of the charging controller is not less than the equalizing charge voltage, it is determined that the equalizing charge condition is not satisfied.

[0008] As a further improvement of the present invention, in S5, controlling the output voltage at the output end of the charging controller according to the equalizing charge control strategy corresponding to the equalizing charge condition includes: Perform constant current charging with the current output voltage at the output end of the charging controller; Judge whether the charging current value is less than the charging current threshold value; If the charging current value is less than the charging current threshold value, then adjust the output voltage at the output end of the charging controller according to the equalizing charge control strategy so that the charging current value is equal to the charging current threshold value.

[0009] As a further improvement of the present invention, in S5, controlling the output voltage at the output end of the charging controller according to the preset floating charge control strategy includes: Determine whether the output voltage at the output terminal of the charging controller is equal to the floating charge voltage in the floating charge control strategy; If the output voltage at the output terminal of the charging controller is equal to the floating charge voltage, perform the steps of controlling the output voltage of the output terminal according to the floating charge control strategy.

[0010] As a further improvement of the present invention, after performing S5, it further includes: Judge whether the preset operating state switching condition is satisfied according to the charging current value; If the operating state switching condition is satisfied, after the switching interval time in the operating state switching condition, the equalizing charge state is transferred to the floating charge state.

[0011] As a further improvement of the present invention, the charging controller is connected to the positive and negative electrodes of the charging battery through a DC bus.

[0012] A charging control system based on a power DC power supply includes a charging battery and a charging controller. A current sensor is provided on the charging battery. The output terminal of the charging controller is connected to the charging battery, the input terminal is connected to the AC mains, and the charging controller is also communicatively connected to the current sensor.

[0013] A charging control device based on a power DC power supply includes a processor and a memory. When the processor executes the computer program stored in the memory, it implements the charging control method based on the power DC power supply as described above.

[0014] A computer-readable storage medium is used to store a computer program. When the computer program is executed by a processor, it implements the charging control method based on the power DC power supply as described above.

[0015] The present invention has achieved the following technical effects compared with the prior art: The charging control method of the present invention determines whether the AC mains power is cut off. If the power is cut off, it controls the output voltage of the output terminal to be zero, periodically judges whether the AC mains power is restored to obtain a power restoration judgment result. If the power is restored, it controls the output voltage to be equal to the current bus voltage and increases the output voltage according to the voltage stepping strategy. At the same time, it judges whether the equalizing charge condition is satisfied. If the equalizing charge condition is satisfied, it controls the output voltage of the output terminal according to the equalizing charge control strategy. If not, it depends on the output voltage of the output terminal. For the above charging control method, after the AC mains power is restored, it strictly controls the output voltage of the output terminal and monitors the charging current value of the charging battery, gradually adjusts the output voltage through the voltage stepping strategy, and can prevent the battery from overcurrent. It can adjust to enter the equalizing charge mode or the floating charge mode in time according to the charging state, reduce the damage of overcharging to the charging battery, and improve the service life and use safety of the charging battery. Description of the Drawings

[0016] Figure 1 This is a schematic diagram of the method flow of the present invention.

[0017] Figure 2 This is an application scenario diagram of the method of the present invention.

[0018] Figure 3 This is a schematic block diagram of the computer device of the present invention.

[0019] Reference numerals: 10, charging controller; 20, DC bus; 30, charging battery; 31, current sensor; Detailed implementation manners The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the accompanying drawings.

[0020] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments: As Figure 1 shown, an embodiment of the present invention provides a charging control method based on a power DC power supply. This method is applied to a charging controller and is executed by an application software installed in the charging controller. The specific application scenario is as Figure 2 shown. The input end of the charging controller 10 is connected to the AC mains. The two output ends of the charging controller 10 are respectively connected to two DC buses 20. The positive and negative poles of the charging battery 30 are connected in series and connected to the two DC buses 20. The charging controller 10 is communicatively connected to the current sensor 31 provided on the charging battery 30; the charging controller 10 includes a voltage conversion circuit and an MCU controller. The MCU controller receives the current value detected by the current sensor 31 and the voltage value of the DC bus 20. The MCU controller simultaneously controls the output voltage output from the voltage conversion circuit to the DC bus 20.

[0021] As Figure 1 shown, the charging control method based on the power DC power supply includes the following steps: Step S110: When the AC mains power is cut off, the output voltage at the output end of the charging controller is zero so that the charging battery enters the discharge mode.

[0022] Specifically, it is possible to determine whether the input voltage of the AC mains is less than the input voltage value, thereby determining whether the AC mains is powered off. Generally speaking, the voltage value of the AC mains (the difference between the highest voltage of the neutral wire and the live wire) is 220V, so the input voltage value can be set not higher than 220V. For example, the input voltage value can be set to 200V or 210V. If the input voltage of the AC mains is less than the input voltage value, it can be determined that the AC mains is powered off; if the input voltage of the AC mains is not less than the input voltage value, it is determined that the AC mains is not powered off.

[0023] Further, if the AC mains is powered off, the output voltage at the output end can be controlled to be zero at this time. At this time, the rechargeable battery discharges and supplies power to the DC bus, and the bus voltage is also the voltage between the positive and negative poles of the rechargeable battery. At this time, the rechargeable battery enters the discharge mode. Among them, multiple rechargeable batteries are connected in series to form a group of rechargeable batteries for discharging. If the discharge voltage of a single rechargeable battery is U, the combined voltage of N rechargeable batteries for discharging is N×U, and the voltage on the DC bus is N×U.

[0024] Step S120: Periodically judge the AC mains according to the preset judgment period to obtain the power supply restoration result.

[0025] It is possible to judge whether the AC mains is restored according to the judgment period. Specifically, in each judgment period, a judgment process for whether the AC mains is restored is executed; it is possible to judge whether the input voltage of the AC mains is restored to not less than the above preset input voltage value. For example, the judgment period can be set to 0.1 second, and then whether the AC mains is restored is judged every 0.1 second, so as to obtain the power supply restoration judgment result.

[0026] Step S130: Judge the power supply restoration result. If the power supply restoration result is no, return to execute Step 1. If the power supply restoration judgment result is no, return to execute Step S110, that is, continuously keep the output voltage at the output end zero, and judge again whether the AC mains resumes power supply when the next judgment period arrives.

[0027] Step S140: If the power supply restoration judgment result is yes, control the output voltage at the output end of the charge controller to be equal to the current bus voltage.

[0028] If the power supply restoration judgment result is yes, it indicates that the AC mains has been restored at this time. At this time, the current bus voltage can be obtained, and the current bus voltage is also the voltage between the positive and negative poles of the rechargeable battery; control the output voltage at the output end of the charge controller to be the current bus voltage, and the charging current is zero at this time.

[0029] Step S150: Increase the output voltage at the output end of the charge controller according to the threshold set by the preset charge controller, and judge whether the preset equalizing charge condition is satisfied according to the charging current value of the rechargeable battery.

[0030] Gradually increase the output voltage at the output terminal according to the voltage step strategy, and while increasing the output voltage, determine whether the preset equalizing charge condition is satisfied according to the charging current value of the rechargeable battery. If it is determined that the equalizing charge condition is satisfied or not satisfied, both jump out of the loop of increasing the output voltage and execute the operation; if the determination result of satisfying or not satisfying the equalizing charge condition is not obtained, continue to increase the output voltage according to the voltage step strategy.

[0031] In a specific embodiment, increasing the output voltage at the output terminal according to the preset voltage step strategy includes determining a target output voltage according to the step voltage value in the voltage step strategy and the current output voltage at the output terminal; determining a corresponding adjustment time point according to the adjustment period and the start time point in the voltage step strategy; the start time point is the time point of the last output voltage adjustment or the start time point of increasing the output voltage; if the adjustment time point is reached, adjust the output voltage value at the output terminal to the target output voltage.

[0032] Specifically, determine the target output voltage according to the step voltage value in the voltage step strategy and the current output voltage at the output terminal, add the current output voltage and the step voltage value, and the obtained voltage value is determined as the target output voltage. Determine the corresponding adjustment time point according to the adjustment period and the start time point in the voltage step strategy. Among them, if the output voltage has been stepped adjusted, the start time point is the time point of the last output voltage adjustment; if the output voltage has not been stepped adjusted, the start time point is the start time point of increasing the output voltage, that is, the start time point of starting to execute the voltage step strategy.

[0033] If the adjustment time point of this voltage step adjustment is reached, adjust the output voltage at the output terminal to the target output voltage. By adjusting the output voltage at the output terminal, the processing of one voltage step adjustment is completed.

[0034] In this embodiment, determining whether the charging current value of the rechargeable battery satisfies the preset equalizing charge condition includes: judging whether the charging current value of the rechargeable battery is less than the charging current threshold value in the charging condition, and at the same time judging whether the output voltage at the output terminal is less than the preset equalizing charge voltage; if the charging current value is less than the charging current threshold value and the output voltage is less than the equalizing charge voltage, execute again the step of increasing the output voltage at the output terminal according to the preset voltage step strategy; if the charging current value is not less than the charging current threshold value, it is determined that the equalizing charge condition is satisfied; if the output voltage is not less than the equalizing charge voltage, it is determined that the equalizing charge condition is not satisfied.

[0035] After completing a step - by - step voltage adjustment, it is possible to determine whether the charging current value of the rechargeable battery is less than the charging current threshold value set in the charging conditions. Since the output voltage at the output terminal continuously increases during the step - by - step adjustment of the output voltage, it is also possible to determine whether the output voltage value at the output terminal is less than the set equalizing charge voltage.

[0036] If the charging current value is less than the charging current threshold value and the output voltage is less than the equalizing charge voltage, it indicates that the charging efficiency can be further improved at this time, and the step of increasing the output voltage through the voltage step - by - step strategy can be executed again. If the charging current is not less than the charging current threshold value, it indicates that the rechargeable battery has discharged a large amount during the mains power - off stage, and it is determined that the equalizing charge condition is met. At this time, it is necessary to switch to the equalizing charge mode, that is, to control the charging current value to be constantly the charging current threshold value. Specifically, the charging current threshold value can be set to 0.1C 10 , C 10 is the battery discharge capacity index, and C 10 represents the capacity released by the battery after 10 - hour discharge, in units of Ah (ampere - hour). 0.1C 10 is also 10% of the rated battery charging current. For example, a 100 - Ah battery is charged / discharged at 0.1C (i.e., 10% of the rated current), and the discharge current is 10A.

[0037] If the output voltage is not less than the equalizing charge voltage, it is determined that the equalizing charge condition is not met, indicating that the battery has discharged less during the mains power - off stage, and the rechargeable battery can be charged in the floating charge mode.

[0038] Step S160: If the equalizing charge condition is met, control the output voltage at the output terminal of the charge controller according to the equalizing charge control strategy corresponding to the equalizing charge condition to charge the rechargeable battery.

[0039] Specifically, if the equalizing charge condition is met, control the output voltage at the output terminal according to the equalizing charge control strategy corresponding to the equalizing charge condition, so as to control the rechargeable battery to be quickly charged in the equalizing charge mode.

[0040] In a specific embodiment, constant - current charging is performed with the current output voltage at the output terminal of the charge controller. Determine whether the charging current value is less than the charging current threshold value. If the charging current value is less than the charging current threshold value, adjust the output voltage at the output terminal according to the equalizing charge control strategy to make the charging current value equal to the charging current threshold value.

[0041] Specifically, constant current charging can be performed based on the current output voltage at the output terminal of the charging controller. In the initial stage of charging when the equalizing charge condition is met, the current output voltage at the output terminal of the charging controller can maintain the charging current value of the charging battery equal to the charging current threshold value, thereby maximizing the charging efficiency while ensuring the safety of the battery. After further charging, as the battery charge increases, the charging current value will decrease. After maintaining constant current charging for a period of time, it can be determined whether the charging current value is less than the charging current threshold value. If it is less than the charging current threshold value, the output voltage is adjusted according to the equalizing charge control strategy, that is, the output voltage at the output terminal is further increased on the premise that the output voltage does not exceed the floating charge voltage, so as to ensure that the charging current value is equal to the charging current threshold value.

[0042] In a specific embodiment, after step six, it further includes: determining whether the output voltage at the output terminal is equal to the preset floating charge voltage; if the output voltage is equal to the floating charge voltage, perform the step of controlling the output voltage at the output terminal according to the preset floating charge control strategy.

[0043] Step S170: If the equalizing charge condition is not met, control the output voltage at the output terminal of the charging controller according to the preset floating charge control strategy to charge the charging battery.

[0044] In a specific embodiment, control the output voltage at the output terminal of the charging controller to be equal to the preset floating charge voltage according to the floating charge control strategy.

[0045] Specifically, the output voltage at the output terminal can be controlled to be equal to the floating charge voltage according to the floating charge control strategy, that is, stably charge at the floating charge voltage. The floating charge voltage is higher than the output voltage at the output terminal under normal operating conditions. When the charging battery is fully charged, it switches from the equalizing charge state to the floating charge state. For example, the floating charge voltage is 2.35V×N, where N is the number of charging batteries, and the output voltage at the output terminal under normal operating conditions is 2.25V×N, and 2.25V×N corresponds to the operating voltage value.

[0046] In a specific embodiment, after step seven, it further includes: determining whether the preset operating state switching condition is met according to the charging current value; if the operating state switching condition is met, switch from the equalizing charge state to the floating charge state after the switching interval time in the operating state switching condition.

[0047] Further, it can be determined whether the operating state switching condition is met according to the charging current value. The operating state switching condition includes a switching current threshold. For example, the switching current threshold can be set to 0.01C 10, the switching current threshold is less than the charging current threshold value. During the continuous charging process of the rechargeable battery, as the battery charge continues to increase, the charging current value will become smaller. If the charging current value is equal to the switching current threshold, it is determined that the operating state switching condition is met; if the charging current value is greater than the switching current threshold (since the charging current value will decrease after being equal to the charging current threshold value, there is no situation where the charging current value is less than the switching current threshold value here), it is determined that the operating state switching condition is not met.

[0048] If the operating state switching condition is met, after an interval switching time, the output voltage of the output terminal is adjusted to the operating voltage value, thereby switching the charging state of the rechargeable battery from the equalizing charge state to the floating charge state. Specifically, the switching time can be 3h. Then, after the operating state switching condition is determined to be met, the output voltage remains at the floating charge voltage for 3h and then switches to the operating voltage value, and the operating voltage value is less than the floating charge voltage. After the rechargeable battery enters the floating charge state, the charging current value of the rechargeable battery further decreases, that is, the charging current value of the rechargeable battery is less than the switching current threshold value at this time.

[0049] During the execution of steps S130 to S170, if it is determined that the AC mains power is cut off, the process immediately returns to execute step S110.

[0050] An embodiment of the present invention further provides a charging control device based on a power DC power supply, including a processor and a memory. Among them, when the processor executes the computer program stored in the memory, it implements the charging control method based on the power DC power supply provided by the embodiment of the present invention. As Figure 3 shown, the computer device 500 includes a processor 502, a memory, and a network interface 505 connected through a communication bus 501. Among them, the memory may include a storage medium 503 and an internal memory 504.

[0051] The storage medium 503 can store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, the processor 502 can be made to execute the charging control method based on the power DC power supply. Among them, the storage medium 503 can be a volatile storage medium or a non-volatile storage medium.

[0052] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500.

[0053] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can be made to execute the charging control method based on the power DC power supply.

[0054] The network interface 505 is used for network communication, such as providing data information transmission, etc. Those skilled in the art can understand that Figure 3 The structure shown in Figure 3 is only a block diagram of some structures related to the solution of the present invention, and does not constitute a limitation on the computer device 500 to which the solution of the present invention is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0055] Wherein, the processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding functions in the above-mentioned charging control method based on the DC power supply.

[0056] Those skilled in the art can understand that Figure 3 The embodiments of the computer device shown in Figure 3 do not constitute a limitation on the specific composition of the computer device. In other embodiments, the computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements. For example, in some embodiments, the computer device may only include a memory and a processor. In such an embodiment, the structures and functions of the memory and the processor are the same as those in Figure 3 the embodiment shown, and will not be elaborated here.

[0057] The steps of the method or algorithm described in combination with the embodiments disclosed in this article can be directly implemented by hardware, a software module executed by a processor, or a combination of both. The software module can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0058] The above has introduced in detail the charging control method, system and device based on the DC power supply provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A charging control method based on a DC power supply, characterized in that: Applied to the charging control system, including the following steps: S1. When the AC mains is cut off, the output voltage of the charging controller output terminal is zero to put the rechargeable battery into discharge mode; S2. Perform periodic judgment on the AC mains according to a preset judgment cycle to obtain a power supply restoration result; S3, judging the power supply recovery result, if the power supply recovery result is no, returning to step S1; if the power supply recovery result is yes, controlling the output voltage of the output end of the charging controller to be equal to the current bus voltage; S4, increasing the output voltage of the output terminal of the charging controller according to a preset voltage stepping strategy, and judging whether the preset equalization charging condition is met according to the charging current value of the rechargeable battery; S5. If the equalizing charging condition is met, the output voltage of the output end of the charging controller is controlled to charge the rechargeable battery according to the equalizing charging control strategy corresponding to the equalizing charging condition; if the equalizing charging condition is not met, the output voltage of the output end of the charging controller is controlled to charge the rechargeable battery according to the preset floating charging control strategy.

2. The charging control method based on the electric DC power supply according to claim 1, characterized in that: In S4, the output voltage of the output terminal of the charging controller is increased according to a preset voltage step strategy, including: Determine the target output voltage according to the step voltage value in the voltage step strategy and the current output voltage at the output end of the charge controller; The corresponding adjustment time point is determined according to the adjustment cycle and the starting time point in the voltage step strategy, where The starting time point is the time point when the output voltage was last adjusted or the start time point when the output voltage is increased; When the adjustment time point is reached, the output voltage value of the output terminal of the charging controller is adjusted to the target output voltage.

3. The charging control method based on the electric DC power supply according to claim 1, characterized in that: In S4, judging whether the preset equalization charging condition is met according to the charging current value of the rechargeable battery includes: Determine whether the charging current value of the rechargeable battery is less than the charging current threshold value in the charging condition, and at the same time determine whether the output voltage of the output end of the charging controller is less than the preset average charge voltage; If the charging current value is less than the charging current threshold value and the output voltage of the output end of the charging controller is less than the average charge voltage, the process of increasing the output voltage of the output end of the charging controller according to the preset voltage step strategy is executed again; If the charging current value is not less than the charging current threshold value, it is determined that the equalization charging condition is met; If the output voltage at the output end of the charging controller is not less than the equalizing charge voltage, it is determined that the equalizing charge condition is not met.

4. The charging control method based on the electric DC power supply according to claim 3 is characterized in that: In S5, the output voltage of the output terminal of the charging controller is controlled according to the equalizing charge control strategy corresponding to the equalizing charge condition, including: Perform constant current charging with the current output voltage at the output end of the charge controller; Determine whether the charging current value is less than the charging current threshold value; If the charging current value is less than the charging current threshold value, the output voltage of the charging controller input and output terminals is adjusted according to the equalization charge control strategy so that the charging current value is equal to the charging current threshold value.

5. The charging control method based on the electric DC power supply according to claim 1, characterized in that: In S5, the output voltage of the output terminal of the charging controller is controlled according to a preset floating charge control strategy, including: Determine whether the output voltage of the output terminal of the charge controller is equal to the floating charge voltage in the floating charge control strategy; If the output voltage of the output terminal of the charging controller is equal to the floating charge voltage, a floating charge control strategy is executed to control the output voltage of the output terminal.

6. The charging control method based on electric DC power supply according to claim 1, characterized in that: After S5, it also includes: Determining whether a preset operating state switching condition is met according to the charging current value; If the operating state switching conditions are met, the optimal charging state is transferred to the floating charging state after the switching interval time in the operating state switching conditions.

7. The charging control method based on electric DC power supply according to claim 1, characterized in that: The charging controller is connected to the positive electrode and the negative electrode of the rechargeable battery through a DC bus.

8. A charging control system based on a DC power supply, characterized in that: It comprises a rechargeable battery and a charging controller. The rechargeable battery is provided with a current sensor. The output end of the charging controller is connected to the rechargeable battery, the input end is connected to the AC mains, and the charging controller is also connected to the current sensor for communication.

9. A charging control device based on a DC power supply, characterized in that: It comprises a processor and a memory, wherein when the processor executes the computer program stored in the memory, the charging control method based on the electric DC power supply as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein when the computer program is executed by a processor, the charging control method based on an electric DC power supply as described in any one of claims 1 to 7 is implemented.

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