A reconfigurable mining battery power charging system

Abstract

The present invention provides a reconfigurable mining battery power charging system, the system comprising a rectifier unit, a main DC conversion unit and N sub-DC conversion units, the rectifier unit comprising a rectifier circuit, the main DC conversion unit comprising a main DC conversion circuit, and each of the sub-DC conversion units comprising a sub-DC conversion circuit. According to the reconfigurable mining battery power charging system of the embodiment of the present invention, by controlling the main DC conversion unit and the multiple sub-DC conversion units to work in coordination, the system can work in a variety of input and output modes to adapt to power supply systems of different voltage levels in the mine, meet the charging needs of various types of batteries, greatly improve the use flexibility of the mining charging system, and improve the space utilization rate of the underground charging chamber.

Description

Technical Field

[0001] The invention relates to the technical field of mine power supply, and in particular to a reconfigurable mine battery power supply charging system. Background Art

[0002] Pure electric auxiliary transport vehicles powered by battery power in coal mines have different functions and different rated loads and driving powers, so the required battery power specifications are also quite different. At the same time, the voltage levels of the coal mine power supply system are 380V, 660V, and 1140V, which are very different. However, the rated input voltage range of the current underground charging system is limited, and the output mode is single. Therefore, it is usually necessary to equip the same mine with corresponding charging systems for different models. In addition, the power level and intelligence of the existing charging system are usually low, and the volume is large due to the explosion-proof requirements, which leads to low space utilization of the charging chamber and high operation and maintenance costs, which also seriously affects the charging efficiency and service life of the battery power. Summary of the invention

[0003] In view of this, the present invention provides a reconfigurable mining battery power charging system, which can solve the problems of the mining charging system in the prior art having fixed input and output voltages, being unable to meet the charging needs of various batteries, and having low space utilization rate of the charging chamber.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The embodiment of the present invention provides a reconfigurable mining battery power charging system, comprising a rectifier unit, a main DC conversion unit and N branch DC conversion units; wherein:

[0006] The rectifier unit comprises a rectifier circuit, the rectifier circuit comprises a first rectifier input terminal, a first rectifier output terminal and a second rectifier output terminal, the first rectifier input terminal is used to connect to an AC power source;

[0007] The main DC conversion unit includes a main DC conversion circuit, a first switch, a second switch, a third switch and a fourth switch. The main DC conversion circuit includes a first main input terminal, a second main input terminal, a first main output terminal and a second main output terminal. The first main input terminal is connected to the first rectifier output terminal through the first switch, the second main input terminal is connected to the second rectifier output terminal through the second switch, the first main output terminal is connected to the first terminal of the third switch, the second terminal of the third switch is used to connect to a load, the second main output terminal is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is used to connect to a load.

[0008] Each of the split-DC conversion units includes a split-DC conversion circuit, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch. The split-DC conversion circuit includes a first split input terminal, a second split input terminal, a first split output terminal and a second split output terminal. The first split input terminal is connected to the first rectifier output terminal through the fifth switch, the second split input terminal is connected to the second rectifier output terminal through the sixth switch, the first split output terminal of the split-DC conversion circuit is connected to the first terminal of the eleventh switch, the second terminal of the eleventh switch is used to connect to a load, the second split output terminal of the split-DC conversion circuit is connected to the first terminal of the twelfth switch, and the second terminal of the twelfth switch is used to connect to a load;

[0009] The first branch input terminal of the first DC branch conversion unit is connected to the second main input terminal through the seventh switch, the first branch input terminal of the i-th DC branch conversion unit is connected to the second branch input terminal of the i-1th DC branch conversion unit through the seventh switch, the first branch output terminal of the first DC branch conversion unit is connected to the second main output terminal through the eighth switch and to the first main output terminal through the ninth switch, the first branch output terminal of the i-th DC branch conversion unit is connected to the second branch output terminal of the i-1th DC branch conversion unit through the eighth switch and to the first branch output terminal of the i-1th DC branch conversion unit through the ninth switch, the second branch output terminal of the first DC branch conversion unit is connected to the second main output terminal through the tenth switch, and the second branch output terminal of the i-th DC branch conversion unit is connected to the second branch input terminal of the i-1th DC branch conversion unit through the tenth switch;

[0010] Wherein, i and N are both positive integers and 2≤i≤N.

[0011] Optionally, the rectifier circuit is any one of a single-phase rectifier circuit and a three-phase rectifier circuit.

[0012] Optionally, the rectifier circuit is any one of an uncontrolled rectifier circuit and a controlled rectifier circuit.

[0013] Optionally, the main DC conversion circuit and / or the branch DC conversion circuit are composed of a DC-DC converter.

[0014] Optionally, any one of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch is any one of a mechanical switch, a relay, a semiconductor switch, or a combination of any multiple thereof.

[0015] The beneficial effects of the above technical solution of the present invention are as follows:

[0016] According to the reconfigurable mining battery power charging system of the embodiment of the present invention, by controlling the main DC conversion unit and multiple sub-DC conversion units to work together, the system can work in multiple input and output modes to adapt to the power supply systems of different voltage levels in the mine and meet the charging needs of various types of batteries, thereby greatly improving the flexibility of use of the mining charging system and improving the space utilization rate of the underground charging chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a reconfigurable mining battery power charging system provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a structure in which the number of DC splitting conversion units provided in an embodiment of the present invention is two;

[0019] Figure 3 A schematic diagram of the structure of a charging system operating in a series input and series output mode provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the structure of a charging system operating in a series input and parallel output mode provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the structure of a charging system operating in a mode where input is series connected and output is independent of each other, provided by an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the structure of a charging system operating in an input series and output series independent hybrid mode provided by an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the structure of a charging system operating in an independent mixed mode with series input and parallel output provided by an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the structure of a charging system operating in an input parallel output series mode provided by an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of the structure of a charging system operating in an input parallel output parallel mode provided by an embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the structure of a charging system operating in a parallel input and independent output mode provided by an embodiment of the present invention;

[0027] Fig.11 A schematic diagram of the structure of a charging system operating in an independent hybrid mode with parallel input and series output provided by an embodiment of the present invention;

[0028] Fig.12 A schematic diagram of the structure of a charging system operating in an input parallel output parallel independent hybrid mode provided by an embodiment of the present invention;

[0029] Fig.13 A schematic diagram of the structure of a charging system operating in a parallel-input and series-output mode provided by an embodiment of the present invention;

[0030] Fig.14 A schematic diagram of the structure of a charging system operating in an input hybrid output parallel mode provided by an embodiment of the present invention;

[0031] Fig.15 A schematic diagram of the structure of a charging system operating in a parallel-parallel input and independent output mode provided by an embodiment of the present invention;

[0032] Fig.16 A schematic diagram of the structure of a charging system operating in an input parallel-parallel and output series independent parallel-parallel mode provided by an embodiment of the present invention;

[0033] Fig.17 A schematic diagram of the structure of a charging system operating in an input hybrid and output parallel independent hybrid mode provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0035] Please refer to Figure 1 An embodiment of the present invention provides a structural schematic diagram of a reconfigurable mining battery power charging system, the system may include a rectifier unit 1, a main DC conversion unit 2 and N branch DC conversion units 3, wherein the rectifier unit 1 includes a rectifier circuit, the rectifier circuit includes a first rectifier input terminal, a first rectifier output terminal and a second rectifier output terminal, the first rectifier input terminal is used to connect to an AC power source, the rectifier circuit is used to rectify the input AC power to output DC power, the first rectifier output terminal can be used as the positive pole of the output DC power, and the second rectifier output terminal can be used as the negative pole of the output DC power.

[0036] In the embodiment of the present invention, the main DC conversion unit 2 includes a main DC conversion circuit 21, a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4. The main DC conversion circuit 21 includes a first main input terminal, a second main input terminal, a first main output terminal and a second main output terminal. The first main input terminal of the main DC conversion circuit 21 is connected to the first rectifier output terminal of the rectifier circuit of the rectifier unit 1 through the first switch K1, the second main input terminal of the main DC conversion circuit 21 is connected to the second rectifier output terminal of the rectifier circuit of the rectifier unit 1 through the second switch K2, the first main output terminal of the main DC conversion circuit 21 is connected to the first terminal of the third switch K3, the second terminal of the third switch K3 is used to connect the load, the second main output terminal of the main DC conversion circuit 21 is connected to the first terminal of the fourth switch K4, the second terminal of the fourth switch K4 is used to connect the load, the DC conversion circuit 21 is used to convert the input DC power to output DC power with different characteristics, the first main output terminal can be used as the positive electrode of the output DC power, and the second main output terminal can be used as the negative electrode of the output DC power.

[0037] In an embodiment of the present invention, the system may include N expandable DC-DC conversion units 3, where N is a positive integer, and each DC-DC conversion unit 3 includes a DC-DC conversion circuit 31, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, an eleventh switch K11 and a twelfth switch K12, and the DC-DC conversion circuit 31 includes a first sub-input terminal, a second sub-input terminal, a first sub-output terminal and a second sub-output terminal; wherein the first sub-input terminal of the DC-DC conversion circuit 31 is connected to the first rectifier output terminal of the rectifier circuit through the fifth switch K5, and the first sub-input terminal of the DC-DC conversion circuit 31 is connected to the first rectifier output terminal of the rectifier circuit through the fifth switch K5, and the second sub-input terminal of the DC-DC conversion circuit 31 is connected to the first rectifier output terminal of the rectifier circuit through the fifth switch K5. The two-way input terminal is connected to the second rectifier output terminal of the rectifier circuit through the sixth switch K6, the first branch output terminal of the DC conversion circuit 31 is connected to the first terminal of the eleventh switch K11, the second terminal of the eleventh switch K11 is used to connect the load, the second branch output terminal of the DC conversion circuit 31 is connected to the first terminal of the twelfth switch K12, and the second terminal of the twelfth switch K12 is used to connect the load; the DC conversion circuit 31 is used to convert the input DC power to output DC power with different characteristics, the first branch output terminal of the DC conversion circuit 31 can be used as the positive pole of the output DC power, and the second branch output terminal can be used as the negative pole of the output DC power.

[0038] In the embodiment of the present invention, the first branch input terminal of the first DC branch conversion unit 3 is connected to the second main input terminal of the main DC conversion circuit 21 through the seventh switch K7, and the first branch input terminal of the i-th DC branch conversion unit is connected to the second branch input terminal of the i-1-th DC branch conversion unit through the seventh switch K7. For example, the first branch input terminal of the second DC branch conversion unit is connected to the second branch input terminal of the first DC branch conversion unit through the seventh switch K7, and the first branch input terminal of the third DC branch conversion unit is connected to the second branch input terminal of the second DC branch conversion unit through the seventh switch K7, and so on; the first branch output terminal of the first DC branch conversion unit 3 is connected to the second main output terminal of the main DC conversion circuit 21 through the eighth switch K8, and the first branch output terminal of the first DC branch conversion unit 3 is also connected to the first main output terminal of the main DC conversion circuit 21 through the ninth switch K9, the first branch output terminal of the i-th DC branch conversion unit 3 is connected to the second branch output terminal of the i-1-th DC branch conversion unit through the eighth switch K8, and the first branch output terminal of the i-th DC branch conversion unit 3 is connected to the second branch output terminal of the i-1-th DC branch conversion unit. The output end is also connected to the first branch output end of the i-1th branch DC conversion unit 3 through the ninth switch K9. For example, the first branch output end of the second branch DC conversion unit 3 is connected to the second branch output end of the first branch DC conversion unit through the eighth switch K8, and the first branch output end of the second branch DC conversion unit 3 is also connected to the first branch output end of the first branch DC conversion unit 3 through the ninth switch K9, and so on; the second branch output end of the first branch DC conversion unit 3 is connected to the second branch output end of the main DC conversion circuit 21 through the tenth switch K10. The main output end is connected, the second branch output end of the i-th branch DC conversion unit 3 is connected to the second branch input end of the i-1-th branch DC conversion unit 3 through the tenth switch K10, for example, the second branch output end of the second branch DC conversion unit 3 is connected to the second branch input end of the first branch DC conversion unit 3 through the tenth switch K10, the second branch output end of the third branch DC conversion unit 3 is connected to the second branch input end of the second branch DC conversion unit 3 through the tenth switch K10, and so on; wherein, i is a positive integer and 2≤i≤N.

[0039] According to the reconfigurable mining battery power charging system of the embodiment of the present invention, by controlling the on and off states of different switches, the system can operate in different operating modes to adapt to different application scenarios and meet different charging requirements.

[0040] In some embodiments of the present invention, the rectifier circuit of the rectifier unit 1 may be a single-phase rectifier circuit or a three-phase rectifier circuit, and the selection may be made according to applicable scenarios.

[0041] In some embodiments of the present invention, the rectifier circuit of the rectifier unit 1 may be an uncontrolled rectifier circuit composed of diodes, or a controlled rectifier circuit composed of controllable semiconductor switching devices, and the specific selection may be made according to the usage scenario.

[0042] In some embodiments of the present invention, the main DC conversion circuit 21 can be composed of a DC-DC converter, and the DC conversion circuit 31 can also be composed of a DC-DC converter. The DC-DC converter can be used to process the input DC power to output DC power with different characteristics to meet the battery charging requirements.

[0043] In other embodiments of the present invention, any one of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 may be any one of a mechanical switch, a relay, and a semiconductor switch, or a combination of any two or more thereof. That is to say, the above switches may be manual mechanical switches, or relays, or controllable semiconductor devices, or any combination of mechanical switches, relays, and controllable semiconductor devices.

[0044] The following examples illustrate different working modes of the reconfigurable mining battery power charging system provided by the embodiments of the present invention.

[0045] Please refer to Figure 2 In the embodiment of the present invention, the value of N is 2, that is, the number of the DC conversion units 3 included is two.

[0046] Please refer to Figure 3 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the seventh switch K7, and the eighth switch K8 are all turned on, the sixth switch K6 and the twelfth switch K12 of the second DC conversion unit 3 are turned on, and the remaining switches are all turned off, the system will operate in the input series output series mode.

[0047] Please refer to Figure 4 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4, the seventh switch K7, the ninth switch K9 and the tenth switch K10 are all turned on, the sixth switch K6 of the second DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in the input series output parallel mode.

[0048] Please refer to Figure 5In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4, the seventh switch K7, the eleventh switch K11 and the twelfth switch K12 are all turned on, the sixth switch K6 of the second DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in the input series output independent mode.

[0049] Please refer to Figure 6 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the seventh switch K7 and the twelfth switch K12 are all turned on, the eighth switch K8 of the first DC conversion unit 3 is turned on, the sixth switch K6 and the eleventh switch K11 of the second DC conversion unit 3 are turned on, and the remaining switches are all turned off, the system will operate in the input series output series independent hybrid mode.

[0050] Please refer to Figure 7 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4 and the seventh switch K7 are all turned on, the ninth switch K9 and the tenth switch K10 of the first DC conversion unit 3 are turned on, the sixth switch K6, the eleventh switch K11 and the twelfth switch K12 of the second DC conversion unit 3 are turned on, and the remaining switches are all turned off, the system will operate in the input series output parallel independent mixed mode.

[0051] Please refer to Figure 8 In the embodiment of the present invention, when N is 2, and the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the eighth switch K8 are all turned on, the twelfth switch K12 of the second DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in the input parallel output series mode.

[0052] Please refer to Fig. 9 In the embodiment of the present invention, when N is 2, and the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the ninth switch K9 and the tenth switch K10 are all turned on, and the remaining switches are turned off, the system will operate in the input parallel output parallel mode.

[0053] Please refer to Fig.10 In the embodiment of the present invention, when N is 2, and the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the eleventh switch K11 and the twelfth switch K12 are all turned on, and the remaining switches are all turned off, the system will operate in the input parallel output independent mode.

[0054] Please refer to Fig.11In the embodiment of the present invention, when N takes a value of 2, and the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the twelfth switch K12 are all turned on, the eighth switch K8 of the first DC conversion unit 3 is turned on, the eleventh switch K11 of the second DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in an input parallel output series independent hybrid mode.

[0055] Please refer to Fig.12 In the embodiment of the present invention, when N is 2, and the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all turned on, the ninth switch K9 and the tenth switch K10 of the first DC conversion unit 3 are both turned on, the eleventh switch K11 and the twelfth switch K12 of the second DC conversion unit 3 are both turned on, and the remaining switches are all turned off, the system will operate in the input parallel output parallel independent hybrid mode.

[0056] Please refer to Fig.13 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the sixth switch K6 and the eighth switch K8 are all turned on, the seventh switch K7 of the first DC conversion unit 3 is turned on, the fifth switch K5 and the twelfth switch K12 of the second DC conversion unit 3 are both turned on, and the remaining switches are all turned off, the system will operate in the input hybrid output series mode.

[0057] Please refer to Fig.14 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4, the sixth switch K6, the ninth switch K9 and the tenth switch K10 are all turned on, the seventh switch K7 of the first DC conversion unit 3 is turned on, the fifth switch K5 of the second DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in the input mixed output parallel mode.

[0058] Please refer to Fig.15 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4, the sixth switch K6, the eleventh switch K11 and the twelfth switch K12 are all turned on, the seventh switch K7 of the first DC-DC conversion unit 3 is turned on, the fifth switch K5 of the second DC-DC conversion unit 3 is turned on, and the remaining switches are all turned off, the system will operate in the input hybrid output independent mode.

[0059] Please refer to Fig.16In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the sixth switch K6 and the twelfth switch K12 are all turned on, the seventh switch K7 and the eighth switch K8 of the first DC conversion unit 3 are all turned on, the fifth switch K5 and the eleventh switch K11 of the second DC conversion unit 3 are all turned on, and the remaining switches are all turned off, the system will operate in the input hybrid output series independent hybrid mode.

[0060] Please refer to Fig.17 In the embodiment of the present invention, when N is 2, and the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are all turned on, the seventh switch K7, the ninth switch K9 and the tenth switch K10 of the first DC conversion unit 3 are all turned on, the fifth switch K5, the eleventh switch K11 and the twelfth switch K12 of the second DC conversion unit 3 are all turned on, and the remaining switches are all turned off, the system will operate in the input mixed output parallel independent mixed mode.

[0061] According to the reconfigurable mining battery power charging system of the embodiment of the present invention, the circuit topology can be reconfigured so that the charging system can operate in multiple operating modes such as input series and output series, input series and output parallel, input series and output independently, input series and output mixed, input parallel and output series, input parallel and output parallel, input parallel and output independently, input parallel and output mixed, input mixed and output series, input mixed and output parallel, input mixed and output independent, input mixed and output mixed, so as to adapt to the power supply system of different voltage levels in the mine and meet the charging needs of various batteries, greatly improve the use flexibility of the mining charging system, improve the space utilization rate of the underground charging chamber and the degree of unmanned (or less-manned) attendance, and greatly promote the energy conservation and intelligent development of the coal industry.

[0062] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A reconfigurable mining battery power charging system, characterized in that: It includes a rectifier unit, a main DC conversion unit and N sub-DC conversion units; wherein: The rectifier unit comprises a rectifier circuit, the rectifier circuit comprises a first rectifier input terminal, a first rectifier output terminal and a second rectifier output terminal, the first rectifier input terminal is used to connect to an AC power source; The main DC conversion unit includes a main DC conversion circuit, a first switch, a second switch, a third switch and a fourth switch. The main DC conversion circuit includes a first main input terminal, a second main input terminal, a first main output terminal and a second main output terminal. The first main input terminal is connected to the first rectifier output terminal through the first switch, the second main input terminal is connected to the second rectifier output terminal through the second switch, the first main output terminal is connected to the first terminal of the third switch, the second terminal of the third switch is used to connect to a load, the second main output terminal is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is used to connect to a load. Each of the split-DC conversion units includes a split-DC conversion circuit, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch, the split-DC conversion circuit includes a first split input terminal, a second split input terminal, a first split output terminal and a second split output terminal, the first split input terminal is connected to the first rectifier output terminal through the fifth switch, the second split input terminal is connected to the second rectifier output terminal through the sixth switch, the first split output terminal of the split-DC conversion circuit is connected to the first terminal of the eleventh switch, the second terminal of the eleventh switch is used to connect to a load, the second split output terminal of the split-DC conversion circuit is connected to the first terminal of the twelfth switch, and the second terminal of the twelfth switch is used to connect to a load; The first branch input terminal of the first DC branch conversion unit is connected to the second main input terminal through the seventh switch, the first branch input terminal of the i-th DC branch conversion unit is connected to the second branch input terminal of the i-1th DC branch conversion unit through the seventh switch, the first branch output terminal of the first DC branch conversion unit is connected to the second main output terminal through the eighth switch and to the first main output terminal through the ninth switch, the first branch output terminal of the i-th DC branch conversion unit is connected to the second branch output terminal of the i-1th DC branch conversion unit through the eighth switch and to the first branch output terminal of the i-1th DC branch conversion unit through the ninth switch, the second branch output terminal of the first DC branch conversion unit is connected to the second main output terminal through the tenth switch, and the second branch output terminal of the i-th DC branch conversion unit is connected to the second branch input terminal of the i-1th DC branch conversion unit through the tenth switch; Wherein, i and N are both positive integers and 2≤i≤N.

2. The reconfigurable mining battery power charging system according to claim 1 is characterized in that: The rectifier circuit is any one of a single-phase rectifier circuit and a three-phase rectifier circuit.

3. The reconfigurable mining battery power charging system according to claim 1 is characterized in that: The rectifier circuit is any one of an uncontrolled rectifier circuit and a controlled rectifier circuit.

4. The reconfigurable mining battery power charging system according to claim 1 is characterized in that: The main DC conversion circuit and / or the branch DC conversion circuit are composed of a DC-DC converter.

5. The reconfigurable mining battery power charging system according to claim 1 is characterized in that: Any one of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch is any one of a mechanical switch, a relay, a semiconductor switch or a combination of any multiple thereof.

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