Multi-module direct-current power supply for new energy automobile charging pile and control method of multi-module direct-current power supply

Abstract

The invention provides a multi-module direct current power supply for a new energy automobile charging pile and a control method thereof, and belongs to the technical field of power supplies. Comprising a first direct-current converter, a second direct-current converter, a third direct-current converter, an Nth direct-current converter, an input power supply, a power divider, a power controller, a first output end, a second output end, a third output end and a fourth output end, an input power supply is connected in parallel with the input ends of the first direct-current converter, the second direct-current converter, the third direct-current converter and the Nth direct-current converter; the output ends of the first direct-current converter, the second direct-current converter, the third direct-current converter and the Nth direct-current converter are respectively connected with the power divider, and are output to the first output end, the second output end, the third output end and the fourth output end through the power divider; the power controller respectively controls the output current and the output voltage of the first direct current converter, the second direct current converter, the third direct current converter and the Nth direct current converter; and the power controller controls on and off of a switch in the power divider. According to the embodiment of the invention, high-efficiency, small-size and low-cost power conversion can be realized, the power factor can be accurately controlled, and the efficiency and the power density of the charging pile are improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a multi-module DC power supply and a control method thereof for a new energy vehicle charging pile. Background Art

[0002] New energy vehicle charging pile is a device that provides power supply for new energy vehicles. Its core function is to convert grid power into the voltage and current required by new energy vehicles. Traditional charging piles usually use AC power, which is converted into DC power by on-board chargers to supply new energy vehicles. However, this charging method has problems such as low efficiency, large size and high cost.

[0003] With the development of power electronics technology, multi-module DC power supplies have gradually become the development direction of new energy vehicle charging piles. Multi-module DC power supplies can achieve high-efficiency, small-size, low-cost power conversion, and can flexibly adjust the output voltage and current to meet the charging needs of different types of new energy vehicles.

[0004] However, there are still some problems with the existing multi-module DC power supply and its control method. For example, the existing control method usually adopts voltage or current closed-loop control, which cannot achieve accurate control of the power factor, thus affecting the efficiency and power density of the charging pile.

[0005] Therefore, it is of great significance to develop a multi-module DC power supply and control method for new energy vehicle charging piles. This method can achieve high-efficiency, small-volume, low-cost power conversion, and can accurately control the power factor to improve the efficiency and power density of the charging pile. Summary of the invention

[0006] The present application provides a multi-module DC power supply and a control method thereof for a new energy vehicle charging pile, which can achieve high-efficiency, small-volume, and low-cost power conversion, and can accurately control the power factor to improve the efficiency and power density of the charging pile.

[0007] In the first aspect, the present application provides a multi-module DC power supply for a new energy vehicle charging pile, which includes: a first DC converter, a second DC converter, a third DC converter, an Nth DC converter, an input power supply, a power distributor, a power controller, a first output end, a second output end, a third output end and a fourth output end; the input power supply is connected in parallel with the input ends of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter; the output ends of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter are respectively connected to the power distributor, and are output to the first output end, the second output end, the third output end and the fourth output end through the power distributor; the power controller controls the output current and output voltage of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter respectively; the power controller controls the conduction and disconnection of the switches in the power distributor.

[0008] In some embodiments, the power distributor includes: a first series switch connected to the output negative terminal of the first DC converter and the output positive terminal of the second DC converter; a second series switch connected to the output negative terminal of the second DC converter and the output positive terminal of the third DC converter; a third series switch connected to the output negative terminal of the third DC converter and the output positive terminal of the Nth DC converter; a first positive switch connected to the output positive terminal of the first DC converter and the output positive terminal of the second DC converter; a second positive switch connected to the output positive terminal of the first DC converter and the output positive terminal of the third DC converter; a third positive switch connected to the output positive terminal of the first DC converter and the output positive terminal of the third DC converter; a switch connected to the output positive terminal of the first DC converter and the output positive terminal of the Nth DC converter; a first negative switch connected to the output negative terminal of the first DC converter and the output positive terminal of the Nth DC converter; a second negative switch connected to the output negative terminal of the second DC converter and the output positive terminal of the Nth DC converter; a third negative switch connected to the output negative terminal of the third DC converter and the output positive terminal of the Nth DC converter; a first output switch connected to the output negative terminal of the second DC converter and the second output terminal; a second output switch connected to the output positive terminal of the third DC converter and the third output terminal.

[0009] In some embodiments, the first output terminal is directly connected to the positive output terminal of the first DC converter through the power divider, and the fourth output terminal is directly connected to the negative output terminal of the Nth DC converter through the power divider.

[0010] In some embodiments, it also includes: a power control signal line and a power distribution control bus; the power controller controls the first DC converter, the second DC converter, the third DC converter and the Nth DC converter through the power control signal line, and controls the power distributor through the power distribution control bus.

[0011] In some embodiments, the output rated power of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter is configured to be 1 / N of a preset maximum total output power, and the output voltage adjustable range is configured to be 0 to a preset maximum output voltage.

[0012] In some embodiments, the input power supply is an input DC power supply, and the first DC converter, the second DC converter, the third DC converter and the Nth DC converter each include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

[0013] In some embodiments, the first DC converter, the second DC converter, the third DC converter and the Nth DC converter all include: a high-frequency inverter circuit, the high-frequency inverter circuit includes a first power switch, a second power switch, a third power switch, a fourth power switch, a primary inductor and a primary side of a high-frequency transformer, the first power switch and the second power switch are connected in series to the input power supply, the third power switch and the fourth power switch are connected in series to the input power supply, one end of the primary side of the high-frequency transformer is connected to the end connected to the first power switch and the second power switch through the primary inductor, and the other end of the primary side of the high-frequency transformer is connected to the end connected to the third power switch and the fourth power switch; a rectifier and filter circuit, the rectifier and filter circuit includes a secondary side of a high-frequency transformer, a first diode, a second diode, an output inductor and an output capacitor, one end of the secondary side of the high-frequency transformer is connected to the output positive terminal through the first diode and the output inductor, the other end of the secondary side of the high-frequency transformer is connected to the output positive terminal through the second diode and the output inductor, and the output inductor is connected to the output positive terminal and the output negative terminal respectively.

[0014] In some embodiments, the input power supply is an input AC power supply, and the first DC converter, the second DC converter, the third DC converter and the Nth DC converter each include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

[0015] In some embodiments, the switch in the function distributor is a contactor or a MOSFET tube.

[0016] In the second aspect, the present application provides a control method for a multi-module DC power supply for a new energy vehicle charging pile, wherein the power controller controls the power distributor to execute the following strategy: when the first series switch, the second series switch, and the third series switch are turned on, the first positive switch, the second positive switch, the third positive switch, the first output switch, and the second output switch are all off; or when the first positive switch, the second positive switch, the third positive switch, the first negative switch, the second negative switch, and the third negative switch are turned on, the first series switch, the second series switch, the third series switch, the first output switch, and the second output switch are all off; or when the first output switch and the second output switch are turned on, the first series switch and the third series switch are turned on, and the second series switch, the first positive switch, the second positive switch, the third positive switch, the first negative switch, the second negative switch, and the third negative switch are all off.

[0017] In some embodiments, the power controller controls the first DC converter, the second DC converter, the third DC converter and the Nth DC converter to execute the following strategy: the output rated power is configured to be 1 / N of the preset maximum total output power, and the output voltage adjustable range is configured to be 0 to a preset maximum output voltage.

[0018] The embodiments provided in this application can achieve high-efficiency, small-volume, and low-cost power conversion, and can accurately control the power factor to improve the efficiency and power density of the charging pile.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. The above and other features and advantages will become more apparent to those skilled in the art by describing detailed example embodiments with reference to the accompanying drawings. In the accompanying drawings:

[0021] Figure 1 A schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the internal structure of a power distributor provided in an embodiment of the present application;

[0023] Figure 3A schematic diagram of the internal structure of a DC converter provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present application, the exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0027] In the absence of conflict, the embodiments of the present application and the features therein may be combined with each other.

[0028] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] The terms used herein are only used to describe specific embodiments and are not intended to limit the present application. As used herein, the singular forms "a" and "the" are also intended to include plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "including" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this application, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined herein.

[0031] In view of this, the embodiments of the present application provide a multi-module DC power supply and a control method thereof for a new energy vehicle charging pile, which can achieve high-efficiency, small-volume, and low-cost power conversion, and can accurately control the power factor to improve the efficiency and power density of the charging pile.

[0032] In a first aspect, an embodiment of the present application provides a multi-module DC power supply for a new energy vehicle charging pile.

[0033] Figure 1 This is a schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application. Figure 1 The multi-module DC power supply comprises: a first DC converter (1), a second DC converter (2), a third DC converter (3), an Nth DC converter (4), an input power supply, a power distributor (6), a power controller (7), a first output end (10), a second output end (11), a third output end (12) and a fourth output end (13); the input power supply is connected in parallel to the input ends of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4); the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) The output ends of the first DC converter (2), the third DC converter (3) and the Nth DC converter (4) are respectively connected to a power distributor (6) and output to a first output end (10), a second output end (11), a third output end (12) and a fourth output end (13) through the power distributor (6); the power controller (7) controls the output current and output voltage of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) respectively; and the power controller (7) controls the on and off of switches in the power distributor (6).

[0034] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the on and off of the switch in the power distributor (6), so that the output voltage between the first output terminal (10) and the fourth output terminal (13) is 4U, and U≤Umax, and the total output power is 4P≤Pmax.

[0035] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the on and off of the switch in the power distributor (6), so that the output voltage between the first output terminal (10) and the fourth output terminal (13) is U, and U≤Umax, and the total output power is 4P≤Pmax.

[0036] In this embodiment, the power controller (7) controls the output voltage U of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to change from 0 to Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the on and off of the switch in the power distributor (6), so that the output voltage between the first output terminal (10) and the fourth output terminal (13) changes from 0 to Umax, and the total output power is 4P≤Pmax.

[0037] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the on and off of the switch in the power distributor (6), so that the output voltage between the first output terminal (10) and the second output terminal (11) is 2U, and U≤Umax, and the total output power is 2P≤Pmax / 2, and the output voltage between the third output terminal (12) and the fourth output terminal (13) is 2U, and U≤Umax, and the total output power is 2P≤Pmax / 2.

[0038] Figure 2 This is a schematic diagram of the internal structure of the power distributor provided in the embodiment of the present application. Figure 2In some optional implementations, the power distributor (6) comprises: a first series switch (601), connected to the negative output terminal of the first DC converter (1) and the positive output terminal of the second DC converter (2); a second series switch (602), connected to the negative output terminal of the second DC converter (2) and the positive output terminal of the third DC converter (3); a third series switch (603), connected to the negative output terminal of the third DC converter (3) and the positive output terminal of the Nth DC converter (4); a first positive switch (604), connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the second DC converter (2); a second positive switch (605), connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the third DC converter (3); The third positive switch (606) is connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the Nth DC converter (4); the first negative switch (607) is connected to the negative output terminal of the first DC converter (1) and the positive output terminal of the Nth DC converter; the second negative switch (608) is connected to the negative output terminal of the second DC converter (2) and the positive output terminal of the Nth DC converter; the third negative switch (609) is connected to the negative output terminal of the third DC converter (3) and the positive output terminal of the Nth DC converter; the first output switch (610) is connected to the negative output terminal of the second DC converter (2) and the second output terminal (11); the second output switch (611) is connected to the positive output terminal of the third DC converter (3) and the third output terminal (12).

[0039] In this embodiment, the first series switch (601) is connected to the negative output terminal of the first DC converter (1) and the positive output terminal of the second DC converter (2), the second series switch (602) is connected to the negative output terminal of the second DC converter (2) and the positive output terminal of the third DC converter (3), and the third series switch (603) is connected to the negative output terminal of the third DC converter (3) and the positive output terminal of the Nth DC converter (4). The first series switch (601), the second series switch (602) and the third series switch (603) connect the output voltages of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) in series and output them.

[0040] In this embodiment, the first positive switch (604) is connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the second DC converter (2), the second positive switch (605) is connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the third DC converter (3), the third positive switch (606) is connected to the positive output terminal of the first DC converter (1) and the positive output terminal of the Nth DC converter (4), the first negative switch (607) is connected to the negative output terminal of the first DC converter (1) and the positive output terminal of the Nth DC converter, the second negative switch (608) is connected to the negative output terminal of the second DC converter (2) and the positive output terminal of the Nth DC converter, and the third negative switch (609) is connected to the negative output terminal of the third DC converter (3) and the positive output terminal of the Nth DC converter. The first positive switch (604), the second positive switch (605), the third positive switch (606), the first negative switch (607), the second negative switch (608) and the third negative switch (609) connect the output voltages of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) in parallel and output them.

[0041] In this embodiment, the second output terminal (11) is connected to the negative output terminal of the second DC converter (2) through the first output switch (610); and the third output terminal (12) is connected to the positive output terminal of the third DC converter (3) through the second output switch (611).

[0042] In some optional implementations, the first output terminal (10) is directly connected to the positive output terminal of the first DC converter (1) through a power divider (6), and the fourth output terminal (13) is directly connected to the negative output terminal of the Nth DC converter (4) through the power divider (6).

[0043] In some optional implementations, it also includes: a power control signal line (8) and a power distribution control bus (9); the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) through the power control signal line (8), and controls the power distributor (6) through the power distribution control bus (9).

[0044] In this embodiment, the power controller (7) controls the output current and output voltage of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) through the power control signal line (8) so as to meet the load requirements.

[0045] In this embodiment, the power controller (7) controls the on and off of the switches in the power distributor (6) through the power distribution control bus (9), so that the power output meets the requirements of the load power supply system.

[0046] In some optional implementations, the output rated power of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) is configured to be 1 / N of a preset maximum total output power, and the output voltage adjustable range is configured to be 0 to a preset maximum output voltage.

[0047] In some optional implementations, the input power supply is an input DC power supply (5), and the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) all include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

[0048] Figure 3 A schematic diagram of the internal structure of a DC converter provided in an embodiment of the present application, Figure 4 This is a schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application. Figure 3 and Figure 4 In some optional implementations, the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) all include: a high-frequency inverter circuit, the high-frequency inverter circuit includes a first power switch (101), a second power switch (102), a third power switch (103), a fourth power switch (104), a primary inductor (105) and a primary side of a high-frequency transformer (106), the first power switch (101) and the second power switch (102) are connected in series to an input power supply, the third power switch (103) and the fourth power switch (104) are connected in series to an input power supply, and one end of the primary side of the high-frequency transformer is connected to the first power switch (101) through the primary inductor (105). 1) and one end connected to the second power switch (102), and the other end of the primary side of the high-frequency transformer is connected to one end connected to the third power switch (103) and the fourth power switch (104); a rectifier and filter circuit, the rectifier and filter circuit comprising a secondary side of a high-frequency transformer (106), a first diode (107), a second diode (108), an output inductor (109), and an output capacitor (110), one end of the secondary side of the high-frequency transformer (106) is connected to the output positive end through the first diode (107) and the output inductor (109), the other end of the secondary side of the high-frequency transformer (106) is connected to the output positive end through the second diode (108) and the output inductor (109), and the output inductor (109) is respectively connected to the output positive end and the output negative end.

[0049] In this embodiment, the output voltage and the output current are controlled by adjusting the duty cycle of the first power switch (101), the second power switch (102), the third power switch (103) and the fourth power switch (104).

[0050] Figure 5 This is a schematic diagram of the structure of a multi-module DC power supply for a new energy vehicle charging pile provided in an embodiment of the present application. Figure 5 In some optional implementations, the input power source is an input AC power source (15), and the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) all include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

[0051] In some optional implementations, the switch in the function distributor is a contactor or a MOSFET tube.

[0052] In a second aspect, an embodiment of the present application provides a control method for a multi-module DC power supply for a new energy vehicle charging pile.

[0053] Continue to refer to Figure 2 The embodiment of the present application provides a control method for a multi-module DC power supply for a new energy vehicle charging pile, wherein a power controller (7) controls a power distributor (6) to execute the following strategy: when a first series switch (601), a second series switch (602), and a third series switch (603) are turned on, a first positive switch (604), a second positive switch (605), a third positive switch (606), a first output switch (610), and a second output switch (611) are all turned off; or when a first positive switch (604), a second positive switch (605), a third positive switch (606), a first negative switch (607), a second negative switch (608), and When the third negative switch (609) is turned on, the first series switch (601), the second series switch (602), the third series switch (603), the first output switch (610) and the second output switch (611) are all turned off; or when the first output switch (610) and the second output switch (611) are turned on, the first series switch (601) and the third series switch (603) are turned on, and the second series switch (602), the first positive switch (604), the second positive switch (605), the third positive switch (606), the first negative switch (607), the second negative switch (608) and the third negative switch (609) are all turned off.

[0054] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the first series switch (601), the second series switch (602) and the third series switch (603) in the power distributor (6) to be turned on, and the first positive switch (604), the second positive switch (605), the third positive switch (606), the first output switch (610) and the second output switch (611) to be turned off, so that the output voltage between the first output terminal (10) and the fourth output terminal (13) is 4U, and U≤Umax, and the total output power is 4P≤Pmax.

[0055] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the first positive switch (604), the second positive switch (605), the third positive switch (606), the first negative switch (607), the second negative switch (608) and the third negative switch (609) in the power distributor (6) to be turned on, and the first series switch (601), the second series switch (602), the third series switch (603), the first output switch (610) and the second output switch (611) are all turned off, so that the output voltage between the first output terminal (10) and the fourth output terminal (13) is U, and U≤Umax, and the total output power is 4P≤Pmax.

[0056] In this embodiment, the power controller (7) controls the output voltage U of the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to change from 0 to Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the first positive switch (604), the second positive switch (605), the third positive switch (606), the first negative switch (607), the second negative switch (608) and the third negative switch (609) in the power distributor (6) to be turned on, and the first series switch (601), the second series switch (602), the third series switch (603), the first output switch (610) and the second output switch (611) are all turned off, so that the output voltage between the first output terminal (10) and the fourth output terminal (13) changes from 0 to Umax, and the total output power is 4P≤Pmax.

[0057] In this embodiment, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to output an adjustable voltage U between 0 and Umax, and the output power of each converter is P; the power controller (7) simultaneously controls the first output switch (610), the second output switch (611), the first series switch (601) and the third series switch (603) in the power distributor (6) to be turned on, and the second series switch (602), the first positive The switch (604), the second positive switch (605), the third positive switch (606), the first negative switch (607), the second negative switch (608) and the third negative switch (609) are all non-conductive, so that the output voltage between the first output terminal (10) and the second output terminal (11) is 2U, and U≤Umax, and the total output power is 2P≤Pmax / 2, and the output voltage between the third output terminal (12) and the fourth output terminal (13) is 2U, and U≤Umax, and the total output power is 2P≤Pmax / 2.

[0058] In some optional implementations, the power controller (7) controls the first DC converter (1), the second DC converter (2), the third DC converter (3) and the Nth DC converter (4) to execute the following strategy: the output rated power is configured to be 1 / N of the preset maximum total output power, and the output voltage adjustable range is configured to be 0 to a preset maximum output voltage.

[0059] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present application as set forth in the appended claims.

Claims

1. A multi-module DC power supply for a new energy vehicle charging pile, characterized in that: include: A first DC converter, a second DC converter, a third DC converter, an Nth DC converter, an input power supply, a power distributor, a power controller, a first output end, a second output end, a third output end, and a fourth output end; The input power source is connected in parallel with the input terminals of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter; The output ends of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter are respectively connected to the power distributor, and are output to the first output end, the second output end, the third output end and the fourth output end through the power distributor; The power controller controls the output current and output voltage of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter respectively; The power controller controls the on and off of switches in the power distributor.

2. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The power distributor comprises: A first series switch is connected to the negative output terminal of the first DC converter and the positive output terminal of the second DC converter; a second series switch is connected to the negative output terminal of the second DC converter and the positive output terminal of the third DC converter; a third series switch is connected to the negative output terminal of the third DC converter and the positive output terminal of the Nth DC converter; A first positive switch is connected to the output positive terminal of the first DC converter and the output positive terminal of the second DC converter; a second positive switch is connected to the output positive terminal of the first DC converter and the output positive terminal of the third DC converter; a third positive switch is connected to the output positive terminal of the first DC converter and the output positive terminal of the Nth DC converter; a first negative switch connected to the output negative terminal of the first DC converter and the output positive terminal of the Nth DC converter; a second negative switch connected to the output negative terminal of the second DC converter and the output positive terminal of the Nth DC converter; a third negative switch connected to the output negative terminal of the third DC converter and the output positive terminal of the Nth DC converter; The first output switch is connected to the negative output terminal of the second DC converter and the second output terminal; the second output switch is connected to the positive output terminal of the third DC converter and the third output terminal.

3. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The first output end is directly connected to the positive output end of the first DC converter through the power divider, and the fourth output end is directly connected to the negative output end of the Nth DC converter through the power divider.

4. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: Also includes: Power control signal line and power distribution control bus; The power controller controls the first DC converter, the second DC converter, the third DC converter and the Nth DC converter through the power control signal line, and controls the power distributor through the power distribution control bus.

5. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The output rated power of the first DC converter, the second DC converter, the third DC converter and the Nth DC converter is configured to be 1 / N of the preset maximum total output power, and the adjustable range of the output voltage is configured to be 0 to a preset maximum output voltage.

6. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The input power supply is an input DC power supply, and the first DC converter, the second DC converter, the third DC converter and the Nth DC converter each include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

7. The multi-module DC power supply for a new energy vehicle charging pile according to claim 6, characterized in that: The first DC converter, the second DC converter, the third DC converter and the Nth DC converter each include: A high-frequency inverter circuit, the high-frequency inverter circuit comprising a first power switch, a second power switch, a third power switch, a fourth power switch, a primary inductor and a primary side of a high-frequency transformer, the first power switch and the second power switch are connected in series to the input power supply, the third power switch and the fourth power switch are connected in series to the input power supply, one end of the primary side of the high-frequency transformer is connected to one end connected to the first power switch and the second power switch through the primary inductor, and the other end of the primary side of the high-frequency transformer is connected to one end connected to the third power switch and the fourth power switch; A rectifier and filter circuit, the rectifier and filter circuit includes a secondary side of a high-frequency transformer, a first diode, a second diode, an output inductor, and an output capacitor. One end of the secondary side of the high-frequency transformer is connected to the output positive end through the first diode and the output inductor, and the other end of the secondary side of the high-frequency transformer is connected to the output positive end through the second diode and the output inductor. The output inductor is respectively connected to the output positive end and the output negative end.

8. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The input power source is an input AC power source, and the first DC converter, the second DC converter, the third DC converter and the Nth DC converter each include a rectifier module, a DC / DC converter with input and output isolation, and at least one isolation transformer.

9. The multi-module DC power supply for a new energy vehicle charging pile according to claim 1, characterized in that: The switch in the function distributor is a contactor or a MOSFET tube.

10. The control method of a multi-module DC power supply for a new energy vehicle charging pile according to any one of claims 1 to 9, characterized in that: The power controller controls the power distributor to execute the following strategy: When the first series switch, the second series switch, and the third series switch are turned on, the first positive switch, the second positive switch, the third positive switch, the first output switch, and the second output switch are all turned off; or When the first positive switch, the second positive switch, the third positive switch, the first negative switch, the second negative switch and the third negative switch are turned on, the first series switch, the second series switch, the third series switch, the first output switch and the second output switch are not turned on; or When the first output switch and the second output switch are turned on, the first series switch and the third series switch are turned on, and the second series switch, the first positive switch, the second positive switch, the third positive switch, the first negative switch, the second negative switch and the third negative switch are all turned off.

11. The control method of a multi-module DC power supply for a new energy vehicle charging pile according to claim 10, characterized in that: The power controller controls the first DC converter, the second DC converter, the third DC converter and the Nth DC converter to execute the following strategy: The output rated power is configured as 1 / N of the preset maximum total output power, and the output voltage adjustable range is configured as 0 to the preset maximum output voltage.

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