CN116014862A - Charging control method, charging device and computer readable storage medium - Google Patents
Charging control method, charging device and computer readable storage medium Download PDFInfo
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Abstract
The invention provides a charging control method, a charging device and a computer readable storage medium, wherein one working period of a four-switch Buck-Boost converter comprises four stages, the output adjustable range is high, and the output of the four-switch Buck-Boost converter is regulated and controlled according to different configurations of an accessed rechargeable battery, so that the four-switch Buck-Boost converter can provide various output specifications according to different configurations of the rechargeable battery, and the charging requirements of various rechargeable batteries are matched, so that the charging device can be suitable for the high-efficiency charging requirements of various rechargeable batteries, and the practicability of the charging device is improved.
Description
Technical Field
The present invention relates to the field of charger technologies, and in particular, to a charging control method, a charging device, and a computer readable storage medium.
Background
With the development of new energy technology, energy storage batteries are increasingly used, and chargers for charging the energy storage batteries are also widely applied to the prior art.
The conventional charger basically carries out constant-current and constant-voltage charging on a battery with one voltage, and is difficult to adapt to charging of batteries with various voltages. To meet the requirement of batteries with various voltages, various chargers with different voltages must be designed, so that the number of the chargers is large, interfaces are not easy to be used commonly, the application range is small, and the charging guarantee capability is poor.
Disclosure of Invention
Based on this, an object of the present invention is to provide a charging control method, a charging device and a computer readable storage medium, so as to identify different rechargeable batteries, provide different charging voltage and current outputs for different rechargeable batteries, meet charging requirements of a plurality of different batteries through one charging device, and improve practicability of the charging device.
In one aspect, the present invention provides a charging control method, including:
sampling to obtain a real-time state of the rechargeable battery, wherein the real-time state comprises a real-time charging voltage and a real-time charging current of the rechargeable battery;
obtaining configuration information of the rechargeable battery according to the real-time state and a preset mapping table, wherein the configuration information comprises constant-current charging current, constant-voltage charging voltage and rated voltage;
acquiring a pulse width modulation signal according to the real-time state and the configuration information;
regulating and controlling the duty ratio of each switching tube of the four-switch Buck-Boost converter according to the pulse width modulation signal so as to regulate and control the output of the four-switch Buck-Boost converter, and charging the rechargeable battery according to the output of the four-switch Buck-Boost converter;
when the real-time charging voltage is smaller than the rated voltage, the pulse width modulation signal is regulated according to the constant-current charging current and the real-time charging voltage, so that the four-switch Buck-Boost converter is regulated to work in a constant-current output mode, and the rechargeable battery is subjected to constant-current charging according to the constant-current charging current;
when the real-time charging voltage reaches the rated voltage, the pulse width modulation signal is regulated according to the constant-voltage charging voltage and the real-time charging current, so that the four-switch Buck-Boost converter is regulated to work in a constant-voltage output mode, and the rechargeable battery is subjected to constant-voltage charging according to the constant-voltage charging voltage;
the working cycle of the four-switch Buck-Boost converter comprises a first section, a second section, a third section and a fourth section which sequentially and continuously occur, wherein in the first section, an energy storage inductor of the four-switch Buck-Boost converter is in a charging state, in the second section and the third section, an energy storage inductor of the four-switch Buck-Boost converter is in a discharging state, and in the fourth section, the four-switch Buck-Boost converter is in a follow current state.
Optionally, in the four-switch Buck-Boost converter, a first end of the energy storage inductor is connected with a positive electrode and a negative electrode of the input power supply respectively through a first switch tube and a second switch tube, a second end of the energy storage inductor is connected with a positive plate and a negative plate of the output capacitor respectively through a third switch tube and a fourth switch tube,
in the first interval, only the first switching tube and the fourth switching tube are conducted, and the inductance current of the energy storage inductor is linearly increased from a follow current value to a first current value;
in the second interval, only the first switching tube and the third switching tube are conducted, and the inductance current of the energy storage inductor is linearly increased from the first current value to a second current value;
in the third interval, only the second switching tube and the third switching tube are conducted, and the inductance current of the energy storage inductor is linearly reduced to a zero-voltage switching current value from the second current value;
in the fourth interval, only the second switching tube and the fourth switching tube are conducted, and the inductance current of the energy storage inductor is reduced to the follow current value and then is maintained to be the follow current value.
Optionally, the method further comprises:
obtaining a first mathematical model and a second mathematical model according to configuration parameters of the four-switch Buck-Boost converter;
substituting the target output voltage and the target output current of the four-switch Buck-Boost converter into the first mathematical model to obtain a first group of duration data, wherein each metadata in the first group of duration data comprises a pair of duration of the first interval and duration of the second interval;
substituting the first group of duration data into the second mathematical module to obtain first metadata which minimizes the effective value of the inductance current of the energy storage inductor;
the pulse width modulation signal is obtained according to the duration of the first interval and the duration of the second interval in the first metadata, so that the duty ratios of the first switching tube to the fourth switching tube are regulated and controlled through the pulse width modulation signal, the duration of the first interval and the duration of the second interval are consistent with the duration of the first interval and the duration of the second interval in the first metadata, and the output of the four-switch Buck-Boost converter is consistent with the target output voltage and the target output current.
Optionally, in a constant current output mode, the target output current is fixed, and the target output voltage is consistent with the real-time charging voltage;
in a constant voltage output mode, the target output voltage is fixed, and the target output current is consistent with the real-time charging current.
Optionally, the first mathematical model comprises:
wherein ,iL (t) is the inductance current of the energy storage inductor, I freewheeling For freewheel current, V in For the input voltage of the four-switch Buck-Boost converter, L m For the inductance value of the energy storage inductor, I 1 V being the maximum current value of the energy storage inductor in the first interval OUT For the four switchesTurning off the output voltage of the Buck-Boost converter, I 2 T being the maximum current value of the energy storage inductor in the second interval 1 T is the duration of the first interval 2 T is the duration of the second interval 3 For the duration of the third interval, T s For the duration of one working period of the four-switch Buck-Boost converter, I OUT The output current of the four-switch Buck-Boost converter is obtained;
and the output voltage and the output current of the four-switch Buck-Boost converter are consistent with the real-time charging voltage and the real-time charging current.
Optionally, the second mathematical model includes:
Optionally, the method further comprises:
regulating and controlling the follow current according to a third mathematical model, wherein the follow current is minimum under the condition that the third mathematical model is met.
Optionally, the third mathematical model comprises:
According to another aspect of the present invention, there is provided a charging device including:
the input end of the four-switch Buck-Boost converter is connected with an input power supply, and the output end of the four-switch Buck-Boost converter provides a charging power supply;
the voltage and current sampling unit is coupled with the output end of the four-switch Buck-Boost converter and is used for sampling the charging power supply to obtain real-time charging voltage and real-time charging current;
a main controller for obtaining pulse width modulation signals according to the charge control method provided by the invention,
and the driving unit is used for providing a grid driving signal of each switching tube in the four-switch Buck-Boost converter by the pulse width modulation signal.
According to still another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program, characterized in that the computer program is operable to execute the charge control method provided by the present invention.
According to the charging control method provided by the invention, the four-switch Buck-Boost converter is designed into four stages, so that the output adjustable range of the four-switch Buck-Boost converter is improved, multiple output specifications can be provided according to different configurations of the rechargeable batteries, the charging requirements of the multiple rechargeable batteries are matched, one charging device can be suitable for the efficient charging requirements of the multiple rechargeable batteries, and the practicability of the charging device is improved.
Drawings
Fig. 1 is a schematic structural view of a prior art battery charger;
fig. 2 is a schematic view of a part of a charging device according to an embodiment of the present invention;
FIG. 3 is a main flow chart of a charging control method according to an embodiment of the present invention;
fig. 4 is a waveform diagram of a part of signals of the charging device according to an embodiment of the invention.
Description of main reference numerals:
the invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, in the battery charger 10 of the prior art, the connected mains AC is connected to the system battery charger 10 through the fuse FU, the 220V AC voltage of the mains AC is reduced by the first capacitor C1 and the first resistor R1, rectified by the rectifying circuit 11, filtered by the second capacitor C2, and then the third capacitor C3 provides a charging current output with a current of about 70 mA. When the battery voltage is lower than 4.2 and V, the voltage is sampled by the second resistor R2 and the third resistor R3 and then supplied to the control end of the switching diode ZD, the switching diode ZD is turned off, and the current is fully charged into the rechargeable battery Bn. When the battery voltage increases to 4.2V, the switching diode ZD starts to conduct to exert a shunt effect, thereby completing battery charging of one voltage.
The present invention provides a charging control method based on the prior art that a battery charger 10 can only charge a battery with one voltage, wherein the four-switch Buck-Boost converter is designed into four stages, so that the output adjustable range is improved, the four-switch Buck-Boost converter can provide various output specifications according to different configurations of the rechargeable battery, and the charging control method is matched with the charging requirements of various rechargeable batteries, so that a charging device can be suitable for the efficient charging requirements of various rechargeable batteries, and the practicability of the charging device is improved.
Referring to fig. 2, a schematic diagram of a part of a charging device according to an embodiment of the invention is shown.
In the charging device 20 of the present embodiment, the charging device mainly includes a four-switch Buck-Boost converter 25, a main controller 21, a voltage and current sampling unit 22 and a driving unit 23.
The four-switch Buck-Boost converter 25 is connected to an input power Vin to provide a charging power output.
The voltage and current sampling unit 22 is coupled to the output of the four-switch Buck-Boost converter 25, samples the output of the four-switch Buck-Boost converter 25, and obtains a voltage sampling signal and a current sampling signal, where the voltage sampling signal corresponds to the output voltage of the four-switch Buck-Boost converter 25 and the real-time charging voltage of the rechargeable battery Bn, and the current sampling signal corresponds to the output current of the four-switch Buck-Boost converter 25 and the real-time charging current of the rechargeable battery Bn.
The voltage and current sampling power supply 22 includes, for example, a current transformer and a voltage transformer, whose primary windings are connected in series to the output path of the four-switch Buck-Boost converter 25, and whose secondary windings output a voltage sampling signal and a current sampling signal obtained by the mutual inductance and supply them to the main controller 21.
The main controller 21 obtains the configuration parameters of the currently connected rechargeable battery Bn according to the voltage sampling signal provided by the voltage and current sampling unit 22 and a preset mapping table, provides corresponding pulse width modulation signals to the driving unit 23 according to the configuration parameters of the currently connected rechargeable battery Bn, and the driving unit 23 adjusts the duty ratio of the output gate driving signals according to the pulse width modulation signals, so as to adjust the switching duty ratio of each switching tube of the four-switch Buck-Boost converter 25, adjust the specifications of the output voltage and the output current, and enable the specifications to be matched with the configuration parameters of the currently connected rechargeable battery Bn, and adaptively charge the currently connected rechargeable battery Bn.
The method comprises the steps of dividing the rechargeable battery by the rated voltage of the rechargeable battery, determining the configuration parameters of the rechargeable battery according to the current voltage of the rechargeable battery, wherein the configuration parameters of the rechargeable battery can be confirmed by the fact that the actual voltage of the rechargeable battery can be changed to a certain extent based on different electric quantity of the rechargeable battery, the possible range of the actual voltage of the different rechargeable battery is not too large from the rated voltage of the rechargeable battery, the configuration parameters of the rechargeable battery can be basically and accurately judged according to the current voltage of the rechargeable battery, the mapping table can set a plurality of voltage ranges according to the type of the rechargeable battery matched with the requirements, each voltage range corresponds to one rechargeable battery, and the configuration parameters of the rechargeable battery which is connected at present can be confirmed according to the voltage range of the rechargeable battery (the current voltage of the rechargeable battery) which falls into the mapping table, wherein the configuration parameters comprise constant-current charging current, constant-voltage charging voltage and rated voltage of the rechargeable battery, so that the rechargeable battery can be charged at constant current or constant-voltage charging according to the difference between the current voltage and the rated voltage of the rechargeable battery.
Referring to fig. 3, a main flow chart of a charging control method according to an embodiment of the invention is shown, and with reference to fig. 2, the charging control method of the embodiment mainly includes:
step S01: sampling to obtain a real-time state of the rechargeable battery, wherein the real-time state comprises a real-time charging voltage and a real-time charging current of the rechargeable battery.
Step S02: and obtaining configuration information of the rechargeable battery according to the real-time state and a preset mapping table, wherein the configuration information comprises constant-current charging current, constant-voltage charging voltage and rated voltage.
Step S03: and obtaining a pulse width modulation signal according to the real-time state and the configuration information.
Step S04: and regulating and controlling the duty ratio of each switching tube of the four-switch Buck-Boost converter according to the pulse width modulation signal so as to regulate and control the output of the four-switch Buck-Boost converter, and charging the rechargeable battery according to the output of the four-switch Buck-Boost converter.
Under the condition that the real-time charging voltage is smaller than the rated voltage, the pulse width modulation signal is regulated according to the constant-current charging current and the real-time charging voltage, so that the four-switch Buck-Boost converter 25 is regulated to work in a constant-current output mode, and the rechargeable battery Bn is charged in a constant-current manner according to the constant-current charging current;
under the condition that the real-time charging voltage reaches the rated voltage, the pulse width modulation signal is regulated according to the constant-voltage charging voltage and the real-time charging current, so that the four-switch Buck-Boost converter 25 is regulated to work in a constant-voltage output mode, and the rechargeable battery Bn is subjected to constant-voltage charging according to the constant-voltage charging voltage;
referring further to fig. 4, in the four-switch Buck-Boost converter 25, the first end of the energy storage inductor L is connected to the positive and negative poles of the input power Vin through the first switching tube Q1 and the second switching tube Q2, respectively, and the second end is connected to the positive and negative poles of the output capacitor Co through the third switching tube Q3 and the fourth switching tube Q4, respectively, wherein,
one duty cycle of the four-switch Buck-Boost converter 25 includes a first interval T that occurs sequentially and continuously 1 A second section T2 and a third section T 3 And a fourth interval T 4 . The first segment of each interval is dead time T d 。
In the first interval T 1 In the internal, only the first switching tube Q1 and the fourth switching tube Q4 are conducted, the energy storage inductor L of the four-switch Buck-Boost converter 25 is in a charging state, and the inductance current of the energy storage inductor L is linearly increased from the freewheel current value to the first current value I 1 ；
In the second interval T 2 In the internal, only the first switching tube Q1 and the third switching tube Q3 are conducted, the energy storage inductor L of the four-switch Buck-Boost converter 25 is in a discharge state, and the inductance current of the energy storage inductor L is controlled by a first current value I 1 Linearly increasing to a second current value I 2 ；
In the third interval T 3 In the internal, only the second switching tube Q2 and the third switching tube Q3 are conducted, the energy storage inductor L of the four-switch Buck-Boost converter 25 is in a discharge state, and the inductance current of the energy storage inductor L is controlled by the second current value I 2 Linearly decreasing to zero voltage switching current value I ZVS ；
In the fourth interval T 4 In this case, only the second switching transistor Q2 and the fourth switching transistor Q4 are turned on, the four-switch Buck-Boost converter 25 is in a freewheeling state, and the inductance current of the energy storage inductor L is reduced to a follow current value and then maintained at the follow current value.
Wherein the first mathematical model and the second mathematical model are obtained according to the configuration parameters of the four-switch Buck-Boost converter 25;
the first mathematical model comprises:
the second mathematical model includes:
The charging control method of the present embodiment further includes: substituting the target output voltage and the target output current of the four-switch Buck-Boost converter into a first mathematical model to obtain a first group of duration data, wherein each metadata in the first group of duration data comprises a pair of duration of a first interval T1 and duration of a second interval T2;
substituting the first group of duration data into a second mathematical module to obtain first metadata (obtained by adopting a linear interpolation method) for minimizing the effective value of the inductance current of the energy storage inductor L;
and obtaining a pulse width modulation signal according to the duration of the first interval and the duration of the second interval in the first metadata, so as to regulate and control the duty ratio of the first switching tube to the fourth switching tube through the pulse width modulation signal, so that the duration of the first interval and the duration of the second interval are consistent with the duration of the first interval and the duration of the second interval in the first metadata, and further, the output of the four-switch Buck-Boost converter 25 is consistent with the target output voltage and the target output current.
In the constant current output mode, the target output current is fixed to be constant current charging current of the rechargeable battery, and the target output voltage is consistent with the real-time charging voltage and changes in real time;
in the constant voltage output mode, the target output voltage is fixed to the constant voltage charging voltage of the rechargeable battery, and the target output current is consistent with the real-time charging current.
The output voltage and the output current of the four-switch Buck-Boost converter are consistent with the real-time charging voltage and the real-time charging current.
In this embodiment, the freewheel current is regulated and controlled according to the third mathematical model, and the freewheel current is the minimum value under the condition that the third mathematical model is satisfied, so that the conduction loss of the energy storage inductor L in the fourth interval can be reduced, and the energy conversion efficiency of the system is improved.
The third mathematical model comprises:
The present invention also provides a computer-readable storage medium storing a computer program usable to execute the charge control method of the present invention.
Those of skill in the art will appreciate that the logic or steps represented in the flow diagrams or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection (electronic device) with one or more wires, a portable computer cartridge (magnetic device), a random access Memory (Random Access Memory, simply RAM), a read-Only Memory (Read Only Memory imageROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, simply EPROM or flash Memory), an optical fiber device, and a portable compact disc read-Only Memory (Compact Disc Read-Only Memory, simply CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGA), field-Programmable Gate Array, FPGA, etc.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A charging control method, characterized by comprising:
sampling to obtain a real-time state of the rechargeable battery, wherein the real-time state comprises a real-time charging voltage and a real-time charging current of the rechargeable battery;
obtaining configuration information of the rechargeable battery according to the real-time state and a preset mapping table, wherein the configuration information comprises constant-current charging current, constant-voltage charging voltage and rated voltage;
acquiring a pulse width modulation signal according to the real-time state and the configuration information;
regulating and controlling the duty ratio of each switching tube of the four-switch Buck-Boost converter according to the pulse width modulation signal so as to regulate and control the output of the four-switch Buck-Boost converter, and charging the rechargeable battery according to the output of the four-switch Buck-Boost converter;
when the real-time charging voltage is smaller than the rated voltage, the pulse width modulation signal is regulated according to the constant-current charging current and the real-time charging voltage, so that the four-switch Buck-Boost converter is regulated to work in a constant-current output mode, and the rechargeable battery is subjected to constant-current charging according to the constant-current charging current;
when the real-time charging voltage reaches the rated voltage, the pulse width modulation signal is regulated according to the constant-voltage charging voltage and the real-time charging current, so that the four-switch Buck-Boost converter is regulated to work in a constant-voltage output mode, and the rechargeable battery is subjected to constant-voltage charging according to the constant-voltage charging voltage;
the working cycle of the four-switch Buck-Boost converter comprises a first section, a second section, a third section and a fourth section which sequentially and continuously occur, wherein in the first section, an energy storage inductor of the four-switch Buck-Boost converter is in a charging state, in the second section and the third section, an energy storage inductor of the four-switch Buck-Boost converter is in a discharging state, and in the fourth section, the four-switch Buck-Boost converter is in a follow current state.
2. The charge control method according to claim 1, wherein in the four-switch Buck-Boost converter, a first end of the energy storage inductor is connected to a positive electrode and a negative electrode of an input power source through a first switching tube and a second switching tube, respectively, and a second end is connected to a positive electrode and a negative electrode of an output capacitor through a third switching tube and a fourth switching tube, respectively, wherein,
in the first interval, only the first switching tube and the fourth switching tube are conducted, and the inductance current of the energy storage inductor is linearly increased from a follow current value to a first current value;
in the second interval, only the first switching tube and the third switching tube are conducted, and the inductance current of the energy storage inductor is linearly increased from the first current value to a second current value;
in the third interval, only the second switching tube and the third switching tube are conducted, and the inductance current of the energy storage inductor is linearly reduced to a zero-voltage switching current value from the second current value;
in the fourth interval, only the second switching tube and the fourth switching tube are conducted, and the inductance current of the energy storage inductor is reduced to the follow current value and then is maintained to be the follow current value.
3. The charge control method according to claim 2, characterized by further comprising:
obtaining a first mathematical model and a second mathematical model according to configuration parameters of the four-switch Buck-Boost converter;
substituting the target output voltage and the target output current of the four-switch Buck-Boost converter into the first mathematical model to obtain a first group of duration data, wherein each metadata in the first group of duration data comprises a pair of duration of the first interval and duration of the second interval;
substituting the first group of duration data into the second mathematical module to obtain first metadata which minimizes the effective value of the inductance current of the energy storage inductor;
the pulse width modulation signal is obtained according to the duration of the first interval and the duration of the second interval in the first metadata, so that the duty ratios of the first switching tube to the fourth switching tube are regulated and controlled through the pulse width modulation signal, the duration of the first interval and the duration of the second interval are consistent with the duration of the first interval and the duration of the second interval in the first metadata, and the output of the four-switch Buck-Boost converter is consistent with the target output voltage and the target output current.
4. The charge control method according to claim 3, wherein,
in a constant current output mode, the target output current is fixed, and the target output voltage is consistent with the real-time charging voltage;
in a constant voltage output mode, the target output voltage is fixed, and the target output current is consistent with the real-time charging current.
5. The charge control method according to claim 3, wherein the first mathematical model includes:
and the output voltage and the output current of the four-switch Buck-Boost converter are consistent with the real-time charging voltage and the real-time charging current.
6. The charge control method according to claim 5, wherein the second mathematical model includes:
7. The charge control method according to claim 6, characterized by further comprising:
regulating and controlling the follow current according to a third mathematical model, wherein the follow current is minimum under the condition that the third mathematical model is met.
8. The charge control method according to claim 7, wherein the third mathematical model includes:
9. A charging device, characterized by comprising:
the input end of the four-switch Buck-Boost converter is connected with an input power supply, and the output end of the four-switch Buck-Boost converter provides a charging power supply;
the voltage and current sampling unit is coupled with the output end of the four-switch Buck-Boost converter and is used for sampling the charging power supply to obtain real-time charging voltage and real-time charging current;
a main controller for obtaining a pulse width modulation signal according to the charge control method of any one of claims 1 to 8,
and the driving unit is used for providing a grid driving signal of each switching tube in the four-switch Buck-Boost converter by the pulse width modulation signal.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program is operable to execute the charge control method according to any one of claims 1 to 8.
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