Intelligent charger and charging control method

Abstract

A smart charger and charging control method, the smart charger comprising: a controller, an AC-DC conversion circuit and a DC-DC conversion circuit connected to the controller; the AC input end of the AC-DC conversion circuit is connected to an electrical plug for connecting to external alternating current; the DC output end of the AC-DC conversion circuit is connected to the input end of the DC-DC conversion circuit; the output end of the DC-DC conversion circuit is connected to a charging interface for connecting to an electrical device to be charged; the DC-DC conversion circuit comprises: N DC-DC conversion circuits; N DC-DC conversion circuits correspond to N charging interfaces; wherein N is a positive integer; the controller is connected to a communication interface for communicating with the electrical device to be charged; the controller is used to receive charging communication information sent by the device to be charged when the charging interface is connected to the device to be charged; and the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits are adjusted by using the charging communication information.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to an intelligent charger and a charging control method. Background Art

[0002] With the improvement of living standards, portable electrical equipment products such as tablet computers, e-books, mobile phones, Bluetooth headsets, games, cameras, multimedia players and other necessities in people's daily lives, USB chargers are widely used in modern society. Portable electrical devices usually provide a power connection interface for handheld electrical devices through USB chargers, providing reliable direct current for energy storage electrical equipment.

[0003] However, as the hardware of portable electrical devices is rapidly changing, the built-in battery capacity is also increasing step by step, but the increase in battery capacity will increase the charging time, so the traditional USB charger can no longer meet the market demand. The output connector of the traditional USB charger is a USB interface, and the output power is about 10W, which can no longer meet the market demand.

[0004] Therefore, how to provide a power supply solution that can provide power support for electrical equipment, facilitate control of its power output capacity, and achieve power sharing is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a charger and a control method thereof, which can provide power support for electrical equipment, facilitate control of its power output capacity, and realize power sharing. The specific scheme is as follows:

[0006] In one aspect, the present invention provides a smart charger, comprising: a controller, an AC-DC conversion circuit and a DC-DC conversion circuit connected to the controller;

[0007] The AC input end of the AC-DC conversion circuit is connected to an electrical plug for connecting to external alternating current;

[0008] The DC output terminal of the AC-DC conversion circuit is connected to the input terminal of the DC-DC conversion circuit;

[0009] The output end of the DC-DC conversion circuit is connected to a charging interface for connecting to an electrical device to be charged;

[0010] The DC-DC conversion circuit comprises: N DC-DC conversion circuits; the N DC-DC conversion circuits correspond to N charging interfaces; wherein N is a positive integer;

[0011] The controller is connected to a communication interface for communicating with the electrical device to be charged;

[0012] The controller is used to receive charging communication information sent by the device to be charged when the charging interface is connected to the device to be charged; and use the charging communication information to adjust the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits.

[0013] According to one embodiment of the present invention, the DC-DC conversion circuit includes: a first DC-DC conversion circuit and a second DC-DC conversion circuit;

[0014] The input end of the first DC-DC conversion circuit and the input end of the second DC-DC conversion circuit are respectively connected to the DC output end of the AC-DC conversion circuit;

[0015] The output end of the first DC-DC conversion circuit is connected to a first charging interface, and the output end of the second DC-DC conversion circuit is connected to a second charging interface.

[0016] According to an embodiment of the present invention, the first charging interface is a first USB Type-C interface;

[0017] The second charging interface is a second USB Type-C interface;

[0018] The controller is configured to control the maximum output power of the first DC-DC conversion circuit and the second DC-DC conversion circuit to be a first preset power when the first USB Type-C interface and the second USB Type-C interface are both in use; and to control the maximum output power of the other of the first DC-DC conversion circuit and the second DC-DC conversion circuit to be a second preset power when either the first USB Type-C interface or the second USB Type-C interface is in use.

[0019] According to one embodiment of the present invention, the first preset power is 30W;

[0020] The second preset power is 18W.

[0021] According to one embodiment of the present invention, the first charging interface is a third USB Type-C interface;

[0022] The second charging interface is a first USB A interface;

[0023] The controller is configured to control the maximum output power of the second DC-DC conversion circuit to be a third preset power when the first USB A interface is in use; control the output power of the first DC-DC conversion circuit to be a fourth preset power when the third USB Type-C interface and the first USB A interface are in use at the same time; and control the output power of the first DC-DC conversion circuit to be a fifth preset power when the third USB Type-C interface is in use alone.

[0024] According to one embodiment of the present invention, the third preset power is 12W;

[0025] The fourth preset power is 18W;

[0026] The fifth preset power is 30W.

[0027] According to one embodiment of the present invention, the third preset power is 12W or 18W;

[0028] The fourth preset power is 45W;

[0029] The fifth preset power is 60W.

[0030] According to one embodiment of the present invention, it also includes:

[0031] An indicator light for indicating the working state of the DC-DC conversion circuit;

[0032] The indicator light comprises: a first indicator light corresponding to the first DC-DC conversion circuit, and a second indicator light corresponding to the second DC-DC conversion circuit.

[0033] According to one embodiment of the present invention, the electrical plug is a foldable plug;

[0034] The foldable plug is arranged in a groove at the bottom of the charger housing;

[0035] The foldable plug is electrically connected to the input end of the AC-DC conversion circuit through an electrical spring arranged on the outer bottom of the charger.

[0036] In another aspect, the present invention provides a charger control method, which is applied to any of the above chargers, comprising:

[0037] When the charging interface is connected to the device to be charged, receiving charging communication information sent by the device to be charged;

[0038] The charging communication information is used to adjust the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits.

[0039] The present invention discloses an intelligent charger and a charging control method. The intelligent charger includes: a controller, an AC-DC conversion circuit and a DC-DC conversion circuit connected to the controller; the AC input end of the AC-DC conversion circuit is connected to an electrical plug for connecting to external alternating current; the DC output end of the AC-DC conversion circuit is connected to the input end of the DC-DC conversion circuit; the output end of the DC-DC conversion circuit is connected to a charging interface for connecting to an electrical device to be charged; the DC-DC conversion circuit includes: N DC-DC conversion circuits; N DC-DC conversion circuits correspond to N charging interfaces; wherein N is a positive integer; the controller is connected to a communication interface for communicating with the electrical device to be charged; the controller is used to receive charging communication information sent by the device to be charged when the charging interface is connected to the device to be charged; and the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits are adjusted by using the charging communication information. It can provide power support for electrical devices, facilitate control of their power output capacity, realize power sharing, and realize a variety of convenient, automatic, and fast charging processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a smart charger provided in a specific embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the specific composition structure of a smart charger provided by a specific embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of a dual-interface smart charger provided in another specific embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the structure of a smart charger with dual USB Type-C interfaces provided in another specific embodiment of the present invention;

[0045] Figure 5 A schematic diagram of the structure of a smart charger with a USB Type-C interface and a USB A interface provided in another specific embodiment of the present invention;

[0046] Figure 6 A schematic diagram of the module structure of a smart charger with dual USB Type-C interfaces provided in a specific embodiment of the present invention;

[0047] Figure 7 A schematic diagram of the structure of the circuit composition of the USB Type-C interface of a smart charger with a USB Type-C interface and a USB A interface provided by another specific embodiment of the present invention;

[0048] Figure 8 A schematic diagram of the structure of the USB A interface portion of a smart charger with a USB Type-C interface and a USB A interface provided in another specific embodiment of the present invention;

[0049] Fig. 9 A schematic diagram of the structure of a smart charger provided by a specific embodiment of the present invention;

[0050] Fig.10 The present invention provides a flowchart of a charging control method according to another specific embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0052] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0053] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0054] Please refer to Figure 1 , Figure 2 , Figure 1 A schematic diagram of the structure of a smart charger provided in a specific embodiment of the present invention; Figure 2 The present invention provides a schematic diagram of the specific structure of a smart charger according to a specific embodiment of the present invention.

[0055] In a specific embodiment of the present invention, an embodiment of the present invention provides a charger, including: a controller 110, an AC-DC conversion circuit 120 and a DC-DC conversion circuit 130 connected to the controller; the AC input end of the AC-DC conversion circuit is connected to an electrical plug 140 for connecting to external alternating current; the DC output end of the AC-DC conversion circuit is connected to the input end of the DC-DC conversion circuit; the output end of the DC-DC conversion circuit is connected to a charging interface 150 for connecting to an electrical device to be charged; the DC-DC conversion circuit includes: N DC-DC conversion circuits; N DC-DC conversion circuits correspond to N charging interfaces; wherein N is a positive integer; the controller is connected to a communication interface 160 for communicating with the electrical device to be charged; the controller is used to receive charging communication information sent by the device to be charged when the charging interface is connected to the device to be charged; and the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits are adjusted using the charging communication information.

[0056] That is, the DC-DC conversion circuit may include: a first DC-DC conversion circuit, a second DC-DC conversion circuit ... an Nth DC-DC conversion circuit, and each DC-DC conversion circuit corresponds to its own charging interface. In other words, the charging interface may include: a first charging interface, a second charging interface ... an Nth charging interface. In practical applications, the controller may control the power of each DC-DC conversion circuit according to whether each charging interface is connected to a device to be charged.

[0057] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 3 A schematic diagram of the structure of a dual-interface smart charger provided in another specific embodiment of the present invention; Figure 4 A schematic diagram of the structure of a smart charger with dual USB Type-C interfaces provided in another specific embodiment of the present invention; Figure 5A schematic diagram of the composition structure of a smart charger with a USB Type-C interface and a USB A interface provided in another specific embodiment of the present invention.

[0058] According to one embodiment of the present invention, on the basis of the above specific implementation manner, the DC-DC conversion circuit provided in the embodiment of the present invention includes: a first DC-DC conversion circuit and a second DC-DC conversion circuit; that is, N is 2, and the input end of the first DC-DC conversion circuit and the input end of the second DC-DC conversion circuit are respectively connected to the DC output end of the AC-DC conversion circuit; the output end of the first DC-DC conversion circuit is connected to the first charging interface, and the output end of the second DC-DC conversion circuit is connected to the second charging interface.

[0059] Thus, the smart charger provided by the present invention can provide power support for two electronic devices to be charged at the same time. For example, according to one embodiment of the present invention, the first charging interface is a first USB Type-C interface; the second charging interface is a second USB Type-C interface; the controller is used to control the maximum output power of the first DC-DC conversion circuit and the second DC-DC conversion circuit to be the first preset power when the first USB Type-C interface and the second USB Type-C interface are in use at the same time; when any one of the first USB Type-C interface and the second USB Type-C interface is in use, the maximum output power of the other of the first DC-DC conversion circuit and the second DC-DC conversion circuit is controlled to be the second preset power. According to one embodiment of the present invention, the first preset power is 30W; the second preset power is 18W.

[0060] That is to say, an embodiment of the present invention provides a smart charger with two USB Type-C interfaces. When the two USB Type-C interfaces work at the same time, they can each provide 18W of power. When only one USB Type-C interface works, the controller can control the DC-DC conversion circuit corresponding to the USB Type-C interface to increase the maximum power, thereby enabling faster charging.

[0061] Of course, the charging interface in the embodiment of the present invention is not limited to the USB Type-C interface, but may also be other charging interfaces. For example, according to one embodiment of the present invention, the first charging interface is a third USB Type-C interface; the second charging interface is a first USB A interface; and the controller is used to control the maximum output power of the second DC-DC conversion circuit to be a third preset power when the first USB A interface is in use; when the third USB Type-C interface and the first USB A interface are in use at the same time, the output power of the first DC-DC conversion circuit is controlled to be a fourth preset power; when the third USB Type-C interface is in use alone, the output power of the first DC-DC conversion circuit is controlled to be a fifth preset power.

[0062] In one embodiment of the present invention, the third preset power may be 12 W; the fourth preset power may be 18 W; and the fifth preset power may be 30 W. In other words, the smart charger provides power support for general electronic devices with lower power, such as mobile phones, tablets, e-book readers and other small electronic devices.

[0063] Of course, based on this hardware, the power that the smart charger can provide can also be increased to provide power support for higher-power electronic devices, such as laptops, etc. Specifically, the third preset power can be 12W or 18W; the fourth preset power is 45W; the fifth preset power is 60W. That is to say, the third USB Type-C interface can provide power for higher-power electronic devices, while for the USB A interface, it can be connected to electronic devices such as mobile phones or wireless charging transmitters through data charging cables; when directly connected to electronic devices such as mobile phones through data charging cables, the maximum output power of the second DC-DC conversion circuit can be 12W, and when it provides power for wireless charging transmitters, considering the large power loss of wireless charging, the maximum output power of the second DC-DC conversion circuit can be 18W.

[0064] Please refer to Figure 6 , Figure 7 , Figure 8 , Figure 6 A schematic diagram of the module structure of a smart charger with dual USB Type-C interfaces provided in a specific embodiment of the present invention; Figure 7 A schematic diagram of the structure of the circuit composition of the USB Type-C interface of a smart charger with a USB Type-C interface and a USB A interface provided by another specific embodiment of the present invention; Figure 8 A schematic structural diagram of the USBA interface portion of a smart charger with a USB Type-C interface and a USB A interface provided in another specific embodiment of the present invention.

[0065] like Figure 6 As shown, 100-240V AC power is connected to the AC-DC conversion control circuit 620 through the electrical plug 610, and the 13 / 22V switching control circuit 640 can control the specific output voltage of the AC-DC conversion control circuit 620, and the output end of the AC-DC conversion control circuit 620 is respectively connected to the input end of the 1# AC-DC conversion control circuit 630 and the 2# AC-DC conversion control circuit 650, and the output end of the 1# AC-DC conversion control circuit 630 and the 2# AC-DC conversion control circuit 650 are respectively connected to the 1# USB Type-C interface J1 and the 2# USB Type-C interface J2 through the 1# PD protocol control communication output interface circuit 670 and the 2# PD protocol control communication output interface circuit 660; and the USB The Type-C interface can realize both power transmission and PD control protocol information transmission. That is to say, the charging communication information in the embodiment of the present invention can be the charging control information under the PD protocol, realizing the communication between the 1# AC-DC conversion control circuit 630, the 2# AC-DC conversion control circuit 650, and the 13 / 22V switching control circuit 640.

[0066] like Figure 7 , Figure 8 In the figure, when the power of the smart charger is set to 30W, U4 is the PD protocol and control IC, and communicates with the charging device through CC1, CC2, D+, and D-. When there is no device plugged into the USB A port or the device is fully charged, the first pin of U4 is low, and Type-C can provide 30W output power (5V / 9V / 12V / 15V / 20V current maximum 3A). When a device is plugged into the USB A port, the first pin of U4 is high, and Type-C can provide 18W output power (5V / 9V / 12V / 15V / 20V current maximum 3A), and the USB A port can simultaneously output 5V2.4A 12W to charge the device. When the power of the smart charger is set to 65W, U4 is the PD protocol and control IC, and communicates with the charging device through CC1, CC2, D+, and D-. When there is no device plugged into the USB A port or the device is fully charged, the first pin of U4 is low level, and Type-C can provide 60W output power (5V / 9V / 12V / 15V / 20V current maximum 3A). When there is a device plugged into the USB A port, the first pin of U4 is high level, and Type-C can provide 45W output power (5V / 9V / 12V / 15V / 20V current maximum 3A). The USB A port can simultaneously output 5V2.4A 12W or 5V3A / 9V2A / 12V1.5A QC18W to charge the device.

[0067] Please refer to Fig. 9 , Fig. 9 A schematic diagram of the structure of a smart charger provided in a specific embodiment of the present invention.

[0068] In one embodiment of the present invention, a smart charger is provided for obtaining power from an indoor power strip, and includes: a housing, a charging mark, and an LED light indicator arranged on one side of an upper cover.

[0069] On the basis of the above specific implementation manner, according to one embodiment of the present invention, the smart charger further includes: an indicator light for indicating the working state of the DC-DC conversion circuit; the indicator light includes: a first indicator light corresponding to the first DC-DC conversion circuit, and a second indicator light corresponding to the second DC-DC conversion circuit.

[0070] According to one embodiment of the present invention, the electrical plug is a folding plug; the folding plug is arranged in a groove at the bottom of the charger shell; the folding plug is electrically connected to the input end of the AC-DC conversion circuit through an electrical spring arranged at the outer bottom of the charger.

[0071] Connect the charging device pin, and place the pin in the rolling groove of the AC pin body, the pin body can be flipped 90 degrees to connect to the power strip; the left AC spring is placed on the pin and connected to the left PIN of the pin body when the pin body is flipped 90 degrees; the right AC spring is placed on the pin and connected to the right PIN of the pin body when the pin body is flipped 90 degrees; the spring pressing block fixes the left and right AC springs to the pin body; the AC-DC conversion part circuit board mainboard; the DC-DC conversion part circuit board; the intelligent control part circuit is scattered on the AC-DC conversion part circuit board mainboard and the DC-DC conversion part circuit board; the Type C connector is placed on the DC-DC conversion part circuit board.

[0072] In some embodiments, the AC-DC conversion part circuit board mainboard includes AC-DC conversion and transformer isolation circuits and connection lines with the subsequent intelligent protocol control part. This part can output two different voltages of 13V / 22V to optimize the DC-DC conversion efficiency and full-load energy efficiency standards.

[0073] In some embodiments, the DC-DC conversion circuit board can be divided into two groups of DC-DC conversion circuit boards and output Type C ports. The protocol control IC is placed on the DC-DC conversion circuit board, and the output state is shared through a single line. When a single group of Type C ports output, the output power of 30W / PD can be met. When two groups of Type C ports output at the same time, any single Type C port outputs 18W / PD, and the maximum output power is 36W.

[0074] Please refer to Fig.10 , Fig.10The present invention provides a flowchart of a charging control method according to another specific embodiment of the present invention.

[0075] In another specific implementation of the present invention, an embodiment of the present invention provides a charging control method, which is applied to the smart charger in any of the above specific implementations. The charging control method includes:

[0076] Step S101: When the charging interface is connected to the device to be charged, charging communication information sent by the device to be charged is received;

[0077] Step S102: using the charging communication information, adjusting the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits.

[0078] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0079] The above is a detailed introduction to a smart charger and a charging control method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A smart charger, characterized in that: include: A controller, an AC-DC conversion circuit and a DC-DC conversion circuit connected to the controller; The AC input end of the AC-DC conversion circuit is connected to an electrical plug for connecting to external alternating current; The DC output terminal of the AC-DC conversion circuit is connected to the input terminal of the DC-DC conversion circuit; The output end of the DC-DC conversion circuit is connected to a charging interface for connecting to an electrical device to be charged; The DC-DC conversion circuit comprises: N DC-DC conversion circuits; N DC-DC conversion circuits correspond to N charging interfaces; wherein N is a positive integer; The controller is connected to a communication interface for communicating with the electrical device to be charged; The controller is used to receive charging communication information sent by the device to be charged when the charging interface is connected to the device to be charged; and adjust the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits by using the charging communication information; The N is 2; The DC-DC conversion circuit includes: a first DC-DC conversion circuit and a second DC-DC conversion circuit; The input end of the first DC-DC conversion circuit and the input end of the second DC-DC conversion circuit are respectively connected to the DC output end of the AC-DC conversion circuit; The output end of the first DC-DC conversion circuit is connected to a first charging interface, and the output end of the second DC-DC conversion circuit is connected to a second charging interface; The first charging interface is a first USB Type-C interface; The second charging interface is a second USB Type-C interface; The controller is configured to control the maximum output power of the first DC-DC conversion circuit and the second DC-DC conversion circuit to be a first preset power when the first USB Type-C interface and the second USB Type-C interface are both in use; and to control the maximum output power of the other of the first DC-DC conversion circuit and the second DC-DC conversion circuit to be a second preset power when either the first USB Type-C interface or the second USB Type-C interface is in use; The first charging interface is a third USB Type-C interface; The second charging interface is a first USB A interface; The controller is configured to control the maximum output power of the second DC-DC conversion circuit to be a third preset power when the first USB A interface is in use; control the output power of the first DC-DC conversion circuit to be a fourth preset power when the third USB Type-C interface and the first USB A interface are in use at the same time; and control the output power of the first DC-DC conversion circuit to be a fifth preset power when the third USB Type-C interface is in use alone.

2. The smart charger according to claim 1, characterized in that: The first preset power is 30W; The second preset power is 18W.

3. The smart charger according to claim 1, characterized in that: The third preset power is 12W; The fourth preset power is 18W; The fifth preset power is 30W.

4. The charger according to claim 1, characterized in that: The third preset power is 12W or 18W; The fourth preset power is 45W; The fifth preset power is 60W.

5. The smart charger according to any one of claims 1 to 4, characterized in that: Also includes: An indicator light for indicating the working state of the DC-DC conversion circuit; The indicator light includes: a first indicator light corresponding to the first DC-DC conversion circuit, and a second indicator light corresponding to the second DC-DC conversion circuit.

6. The smart charger according to any one of claims 1 to 4, characterized in that: The electrical plug is a foldable plug; The foldable plug is arranged in a groove at the bottom of the charger housing; The foldable plug is electrically connected to the input end of the AC-DC conversion circuit through an electrical spring arranged on the outer bottom of the charger.

7. A charger control method, applied to the smart charger according to any one of claims 1 to 6, characterized in that: include: When the charging interface is connected to the device to be charged, receiving charging communication information sent by the device to be charged; The charging communication information is used to adjust the output power of the AC-DC conversion circuit and the output power of the N DC-DC conversion circuits.

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