CN217824754U

CN217824754U - Inverter and power supply system comprising same

Info

Publication number: CN217824754U
Application number: CN202221865777.0U
Authority: CN
Inventors: 李曦; 严安; 卓翠翠
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-11-15
Anticipated expiration: 2032-07-19

Abstract

The utility model provides an inverter and electrical power generating system who contains this inverter to improve the problem that current inverter can't realize filling soon. The inverter includes: the device comprises a shell, a control board, an input connection terminal and at least one output interface group. An accommodating cavity is formed in the shell; the control board is arranged in the accommodating cavity, and an inverter circuit is arranged on the control board; the input electric connection end is arranged on the shell and is used for being electrically connected with the battery pack, and the input electric connection end is electrically connected with the input terminal of the inverter circuit; at least one output interface group is arranged on the shell and is electrically connected with an output terminal of the inverter circuit; wherein the output interface group comprises at least one interface supporting a power transfer protocol. The utility model discloses inverter and the electrical power generating system who contains this inverter can be for possessing the quick charge such as cell-phone, the computer of power transmission agreement, and customer experience feels better.

Description

Inverter and power supply system comprising same

Technical Field

The utility model relates to a current conversion technology field, concretely relates to dc-to-ac converter and electrical power generating system who contains this dc-to-ac converter.

Background

The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current. The inverter is widely applied to the fields of air conditioners, home theaters, gardening tools and the like. The battery pack inverter in the current market generally takes a battery pack as an output power supply to perform inversion, or outputs high-voltage alternating current (such as 110V,220V high-voltage power) through DC-AC; or DC-DC outputs low-voltage DC, however, the existing battery pack inverter does not have the power transmission protocol fast charging function, which affects the customer experience, so it is necessary to provide an inverter and a power supply system including the inverter to provide the fast charging function.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, the present invention provides an inverter and a power supply system including the inverter to improve the problem that the existing inverter does not have a fast charging interface supporting the power transmission protocol and cannot realize fast charging.

To achieve the above and other related objects, the present invention provides an inverter including: the device comprises a shell, a control board, an input connection terminal and at least one output interface group. An accommodating cavity is formed in the shell; the control board is arranged in the accommodating cavity, and an inverter circuit is arranged on the control board; the input electric connection end is arranged on the shell and is used for being electrically connected with a power supply, and the input electric connection end is electrically connected with the input terminal of the inverter circuit; at least one output interface group is arranged on the shell and is electrically connected with an output terminal of the inverter circuit; wherein the output interface set includes at least one interface supporting a power transfer protocol.

The utility model discloses an embodiment of the inverter, the interface that supports the power transmission protocol is Type C interface, output interface group still includes at least one interchange delivery outlet and/or at least one Type A interface.

In an embodiment of the present invention, at least one of the ac output ports outputs 110V or 220V ac power.

The utility model discloses in an embodiment of the inverter, the inverter still includes the temperature detecting element, the temperature detecting element with the control panel electricity is connected, and gathers the control panel and/or the temperature in the holding intracavity.

In an embodiment of the present invention, the inverter further comprises at least one ac outlet, at least one Type a interface and at least one Type C interface located on the same side of the housing.

In an embodiment of the present invention, the housing includes a first housing and a second housing, the first housing and the second housing are detachably connected and surround to form the accommodating chamber, and at least two sets of ventilation openings are disposed on the first housing and/or the second housing, so that the accommodating chamber is communicated with the outside.

In an embodiment of the present invention, the housing includes a first housing and a second housing, the first housing and the second housing are detachably connected and surround to form the accommodating chamber, at least two sets of ventilation openings are disposed on the first housing and/or the second housing, at least one set of ventilation openings is disposed on the housing opposite to the contact interface of the battery pack.

In an embodiment of the present invention, the inverter further includes a fan, the fan is installed on the wall of the housing or in the accommodating cavity, and is electrically connected to the input terminal or the output terminal of the inverter circuit to drive the cooling airflow to flow into the ventilation opening from one set of the ventilation openings and flow out from the other set of the ventilation openings.

In an embodiment of the present invention, the case and the battery pack are provided with a sliding connection portion on a contact interface, and when the battery pack slides from a first position to a second position of the sliding connection portion, the input terminal is electrically connected to the output terminal of the battery pack.

In an embodiment of the present invention, the sliding connection portion includes a pair of guide rails disposed on one of the battery pack or the housing, a guide groove correspondingly disposed on the other of the battery pack or the housing, and a locking member for locking the battery pack or the housing relatively.

In an embodiment of the present invention, the inverter further includes a switch button electrically connected to the control board, and the switch button controls the on/off of the inverter; the switch key is positioned on the outer side wall parallel or approximately parallel to the sliding direction of the sliding connection part.

The utility model also provides a power supply system, including the battery package and with the dc-to-ac converter that the battery package electricity is connected, the dc-to-ac converter includes: casing, control panel, input electrical connection end and output interface group. An accommodating cavity is formed in the shell; the control board is arranged in the accommodating cavity, and an inverter circuit is arranged on the control board; the input connection end is arranged on the shell, one end of the input connection end is electrically connected with the input terminal of the inverter circuit, and the other end of the input connection end is detachably and slidably electrically connected with the output terminal of the battery pack; the output interface group is arranged on the shell and is electrically connected with the output terminal of the inverter circuit; wherein the output interface group comprises at least one interface supporting a power transfer protocol.

The utility model discloses dc-to-ac converter and electrical power generating system who contains this dc-to-ac converter have the interface that supports the power transmission agreement, can be for the cell-phone that possesses the power transmission agreement, quick charge such as computer, customer experience feels better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a three-dimensional schematic diagram of a viewing angle of an embodiment of the present invention;

fig. 2 is a three-dimensional schematic diagram of another view angle of an embodiment of the inverter of the present invention;

fig. 3 is a side view of an embodiment of the inverter of the present invention;

FIG. 4 is a right side view of the inverter of FIG. 3;

FIG. 5 isbase:Sub>A schematic sectional view taken along line A-A of the inverter of FIG. 4;

fig. 6 is an exploded view of an embodiment of the inverter of the present invention;

fig. 7 is a diagram illustrating an installation structure of the locking member and the input terminal on the bracket according to an embodiment of the present invention;

fig. 8 is a front view of the inverter with the second housing removed;

fig. 9 is a front view of the inverter with the second housing, the control board and the switch button removed;

fig. 10 is a three-dimensional view of an embodiment of the inverter according to the present invention, with the second housing, the control board and the switch buttons removed;

fig. 11 is a three-dimensional view of another view angle of the inverter according to the embodiment of the present invention after the second casing, the control board and the switch button are removed.

Description of the element reference numerals:

100. an inverter; 110. a housing; 111. a first housing; 1111. a first vent; 1112. a second ventilation opening; 1113. a third vent; 1114. a socket gap; 112. a second housing; 1121. a first screw assembly; 1122. a first through hole; 1123. a switch key hole; 113. an accommodating cavity; 114. a support pillar; 120. a control panel; 121. a second through hole; 130. inputting an electrical connection terminal; 131. male insertion pieces; 140. an output interface group; 141. a Type C interface; 142. a Type A interface; 143. an AC output port; 150. switching a key; 160. a locking member; 161. an unlock button; 162. a locking body; 170. a support; 171. a second screw assembly; 180. a fan; 190. a guide rail pair; 191. a first guide rail pair; 192. and a second guide rail pair.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can be implemented or applied by other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the present invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.

It should be understood that the terms "upper", "lower", "left", "right", "middle" and "one" used herein are used for descriptive purposes only and are not intended to limit the scope of the present invention, and that changes and modifications in the relative relationship may be made without substantial technical changes and modifications.

Please refer to fig. 1 to 11, the utility model provides an inverter 100, this inverter 100 has the interface that supports the power transmission agreement, can be for the cell-phone that possesses the power transmission agreement, quick charge such as computer, and customer experience feels better, can improve the problem that current inverter does not have the interface that fills soon that supports the power transmission agreement, can't realize filling soon.

Referring to fig. 1, 2, 5 and 6, the inverter 100 includes: the housing 110, the control board 120, the input electrical terminals 130, and at least one output interface set 140. An accommodating cavity 113 is arranged in the shell 110; the structure of the housing 110 is not limited as long as the housing 113 is provided for installation, and may be, for example, a single-piece housing with an installation opening at the lower part, or a combined housing formed by splicing two or more pieces. In an embodiment of the present invention of the inverter 100, the housing 110 includes a first housing 111 and a second housing 112, the first housing 111 and the second housing 112 are fastened together and detachably connected through a first screw component 1121, and the first housing 111 and the second housing 112 surround to form the accommodating cavity 113. The first casing 111 is provided with a corresponding supporting pillar 114, the supporting pillar 114 is provided with a corresponding threaded hole (not shown), the second casing 112 is provided with a first through hole 1122, the control board 120 is provided with a corresponding second through hole 121, and the first screw component 1121 sequentially penetrates through the first through hole 1122 and the second through hole 121 to be in threaded connection with the threaded hole, so that the control board 120 is fixed in the accommodating cavity 113 while the first casing 111 and the second casing 112 are fixed.

Referring to fig. 5 and 6, the control board 120 is detachably and fixedly mounted in the accommodating cavity 113 in the housing 110, and the control board 120 is provided with an inverter circuit, which may be any suitable inverter circuit structure in the prior art and is not described in detail. In addition, the control board 120 may also have other circuits, for example, one or more of the common circuits of the existing inverter 100, such as a control logic circuit, a filter circuit, a low voltage protection circuit, and a short circuit protection circuit, may be included.

Referring to fig. 1, the input electrical connection terminal 130 is disposed on the housing 110 and is used for electrically connecting to a battery pack, the input electrical connection terminal 130 is electrically connected to the input terminal of the inverter circuit, the specific form of the input electrical connection terminal 130 can be flexibly selected according to the output structure of the power supply, and if the output structure of the power supply is a female terminal, the input electrical connection terminal 130 on the inverter 100 can be a male plug 131 matching with the female terminal on the power supply; if the output structure of the power supply is a male plug 131, the input connection terminal 130 of the inverter 100 may be a female terminal matched with the male plug 131 of the power supply.

Referring to fig. 1 and 3, the output interface set 140 is disposed on the housing 110 and electrically connected to the output terminal of the inverter circuit, wherein the output interface set 140 includes at least one interface supporting a power transmission protocol. The Power Delivery protocol (PD protocol for short) is one of the fast charging protocols, and the interface supporting the Power Delivery protocol may be any suitable interface form, such as a Type C interface. In this embodiment, the Type C interface 141 and the Type C interface 141 are mounted on the housing 110 and electrically connected to corresponding output terminals of the inverter circuit, and the Type of the Type C interface 141 can be selected as needed, for example, the latest USB3.1 Type-C interface can be selected, and the maximum transmission rate 10Gbps (1 GB/s) designed by the Type C interface is 2 times that of the USB 3.0. The arrangement form of the output interface set 140 on the housing 110 may not be limited, for example, the output interface set 140 may be directly mounted on the housing 110, or all interfaces in the output interface set 140 may be integrated into one module, and the module is correspondingly mounted on the housing 110.

Referring to fig. 3, in the inverter 100 of the present invention, the output interface set 140 further includes at least one ac output port 143 and at least one Type a interface 142. The number of the ac output ports 143 may be one, two or more, in an embodiment of the present invention, the inverter 100 includes one ac output port 143, one ac output port 143 is electrically connected to the output terminal corresponding to the inverter circuit, the ac output port 143 is a three-hole socket module, and may output corresponding ac voltage, for example, output ac power of 110V, 120V, 220V. A socket notch 1114 is provided on the first housing 111, and the three-jack socket module is snapped into the socket notch 1114. In the utility model discloses another embodiment of inverter 100, inverter 100 includes two ac output ports 143, and two ac output ports 143 are connected with the output terminal electricity that inverter circuit corresponds respectively, and one is used for exporting the 110V alternating current, and another is used for exporting the 220V alternating current to can be respectively for 110V's alternating current consumer and 220V's alternating current consumer provides the power contravariant service. The number of Type a interfaces 142 may also be one, two, or more. Considering that Type-A interface is also more common USB interface, has once been widely used in information communication products such as personal computer and mobile device, for compatible old equipment, provides more comprehensive power contravariant service, in the utility model discloses an embodiment, dc-to-ac converter 100 includes a Type-A interface, and the Type-A interface is connected with inverter circuit's corresponding output terminal electricity.

Referring to fig. 4 to 5 and fig. 11, in an embodiment of the inverter 100 of the present invention, at least two sets of ventilation openings are disposed on the first casing and/or the second casing, so that the accommodating cavity is communicated with the outside. For example, the housing 110 is respectively provided with a first air vent 1111, a second air vent 1112 and a third air vent 1113, the first air vent 1111 is located on the side wall of the housing 110, the second air vent 1112 is located on the top of the housing 110, and the first air vent 1111, the second air vent 1112 and the third air vent 1113 are all communicated with the accommodating cavity 113. It will be appreciated by those skilled in the art that only two vents may be provided in the present invention.

Although only the ventilation holes communicating with the receiving cavity are provided to achieve the heat dissipation effect, in order to obtain a better heat dissipation effect, in an embodiment of the present invention, the inverter 100 further includes a fan 180, the fan 180 is installed on the wall of the housing 110 or in the receiving cavity 113, and the fan 180 is electrically connected to the input terminal 130 or the output terminal of the inverter circuit to obtain the electric power support, so as to drive the cooling airflow to flow into one set of the ventilation holes and flow out of the other set of the ventilation holes. The suction opening of the fan 180 is disposed in the accommodating cavity 113, the blowing opening of the fan 180 faces the third ventilation opening 1113, and the cooling airflow can directly blow the control board 120 or indirectly cool the control board 120, for example, the airflow around the control board 120 is driven to flow to indirectly cool the control board 120. It will of course be appreciated by those skilled in the art that the fan 180 may also be mounted directly on a wall of the housing, such as an outer wall, an inner wall or a space inside a wall, as long as it is capable of powering the cooling air flow.

Referring to fig. 5, in an embodiment of the inverter 100 of the present invention, the inverter 100 further includes a temperature detecting unit (not shown), the temperature detecting unit is electrically connected to the control board 120 and collects the temperature of the control board 120 and/or the accommodating cavity 113, and when the temperature of the control board 120 or the temperature of the accommodating cavity 113 is greater than a set threshold, the control board 120 controls the fan 180 to be turned on. The temperature detection unit may be a temperature detection circuit integrally provided on the control board 120, or may be a temperature sensor separately provided from the control board 120. It should be noted that the control method for controlling the device to be turned on or off by comparing with the set threshold is applied to many fields of automation, and is not described herein again.

Referring to fig. 2 to 3, in an embodiment of the inverter 100 of the present invention, the inverter 100 has one output interface set 140, and all interfaces in the output interface set 140, such as one ac output 143, one Type a interface 142, and one Type C interface 141, are located on the same side of the housing 110. All the interfaces in the output interface group 140 are arranged on the same side of the shell 110, so that the layout of the inverter circuit can be optimized, the arrangement is relatively centralized, only one side provided with the output interface group 140 faces outwards in a narrow space, and the design can be optimized.

Referring to fig. 2 to 3, in an embodiment of the inverter 100 of the present invention, a projection of the housing 110 on a horizontal plane is approximately rectangular, and the output interface set 140 is disposed on a sidewall corresponding to a width direction of the rectangle, so that the sidewall faces outward in a narrow space for convenient insertion. However, as can be understood by those skilled in the art, the inverter 100 of the present invention may include two or more output interface groups 140, each of the output interface groups 140 includes a 110V ac output port, a 220V ac output port, a Type C interface 141 and a Type a interface 142, and a plurality of output interface groups 140 are distributed on the sidewalls of the housing 110 of the inverter 100 in different directions, so as to meet the plugging requirements in different directions, and have high selectivity.

Referring to fig. 1, the power type of the present invention is not limited, and may be any power type suitable for inversion, in an embodiment of the present invention, the power source is a battery pack (not shown), a sliding connection portion is disposed on a contact interface between the housing 110 and the battery pack, and the sliding connection portion can be used to detach the sliding connection and lock the battery pack. When the battery pack slides from the first position to the second position of the sliding connection part, the input connection terminal 130 is electrically connected to the output terminal of the battery pack. In an embodiment of the present invention, the sliding connection portion includes a guide rail pair 190 disposed on one of the battery pack or the housing 110, a guide groove (not shown) correspondingly disposed on the other of the battery pack (not shown) or the housing 110, and a locking member 160 for locking the battery pack or the housing 110 relatively. The positions of the rail set 190 and the guide groove are not limited as long as they are provided on the inverter 100 and the battery pack, respectively, so as to correspond to each other. In an embodiment of the present invention, at least one set of the openings of the ventilation openings is disposed on the casing opposite to the battery pack contact interface, for example, the first ventilation opening 1111 is disposed on the first casing 111 on the battery pack contact interface, so as to simultaneously dissipate the heat of the connection position between the battery pack and the inverter 100.

Referring to fig. 4, 5 and 7, in the present embodiment, the guide rail pair 190 includes a first guide rail pair 191 and a second guide rail pair 192 that are disposed on the first housing 111 in parallel, the upper ends of the first guide rail pair 191 and the second guide rail pair 192 have openings for the battery pack to slide in, and the bottoms of the first guide rail pair 191 and the second guide rail pair 192 are closed to limit the battery pack. The locking member 160 is mounted on the bracket 170, the male tab 131 is also mounted on the bracket 170, the bracket 170 is fixedly mounted on the first housing 111 on the upper portion of the guide rail pair 190 by the second screw assembly 171, the locking member 160 includes an unlocking button 161 and a locking body 162, and a locking groove (not shown) corresponding to the locking body 162 is provided at a corresponding position of the battery pack. The input electrical connection terminal 130 of the inverter 100 is arranged between the first guide rail pair 191 and the second guide rail pair 192, the input electrical connection terminal 130 of the inverter 100 is a male insertion sheet 131, after the battery pack slides in place along the guide rail pair, the male insertion sheet 131 is electrically connected and inserted into a female terminal on the battery pack, and the locking body 162 is automatically inserted into the locking groove. When it is necessary to separate the battery pack from the inverter 100, the unlocking button 161 is pressed, and the locking body 162 is retracted from the locking groove to unlock the battery pack from the inverter 100. It should be noted that, in the present invention, the locking component 160 may be a locking standard component or a locking module commonly used in the power supply field, and may be obtained by general commercial means, which is not described herein again.

Referring to fig. 6, in an embodiment of the inverter 100 of the present invention, the inverter 100 further includes a switch button 150, the second casing 112 is provided with a matching switch button hole 1123, the switch button 150 is installed on the control board 120 in the accommodating cavity 113 and is exposed to the outside of the second casing 112 through the switch button hole 1123, and the switch button 150 is electrically connected to the control board 120 to control the on/off of the inverter 100. The switch key 150 and the output interface set 140 are located on the outer side wall parallel or approximately parallel to the sliding direction of the sliding connection part. It will be understood by those skilled in the art that either the switch key 150 or the output interface set 140 may be disposed on an outer side wall parallel or approximately parallel to the sliding direction of the sliding connection portion.

The utility model also provides a power supply system, power supply system include battery package (not shown) and with the dc-to-ac converter that the battery package electricity is connected, the dc-to-ac converter can be above-mentioned arbitrary embodiment the dc-to-ac converter 100. In an embodiment of the present invention, the inverter 100 includes: a housing 110, a control board 120, input electrical terminals 130, and an output interface set 140. An accommodating cavity 113 is arranged in the shell 110; the control board 120 is installed in the accommodating cavity 113, and an inverter circuit is arranged on the control board 120; the input electric connection end 130 is arranged on the shell 110, the input electric connection end 130 comprises a male insertion piece 131, one end of the male insertion piece 131 is electrically connected with an input terminal of the inverter circuit, and the other end of the male insertion piece 131 is detachably and slidably electrically connected with an output terminal of the battery pack; the output interface set 140 is disposed on the housing 110 and electrically connected to the output terminal of the inverter circuit; wherein the output interface group 140 includes at least one interface supporting a power transfer protocol. The utility model discloses dc-to-ac converter and electrical power generating system who contains this dc-to-ac converter have the interface that supports the power transmission agreement, can be for the cell-phone that possesses the power transmission agreement, quick charge such as computer, customer experience feels better. The utility model discloses thereby some practical problems in the prior art have effectively been overcome and very high use value and use meaning have.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.

Claims

1. An inverter, comprising:

the device comprises a shell, a first fixing piece and a second fixing piece, wherein an accommodating cavity is formed in the shell;

the control board is arranged in the accommodating cavity, and an inverter circuit is arranged on the control board;

the input connection end is arranged on the shell and is used for being electrically connected with the battery pack, and the input connection end is electrically connected with the input terminal of the inverter circuit;

at least one output interface group arranged on the shell and electrically connected with an output terminal of the inverter circuit;

wherein the output interface group comprises at least one interface supporting a power transfer protocol.

2. The inverter of claim 1, wherein the interface supporting the power transfer protocol is a Type C interface, and wherein the set of output interfaces further comprises at least one ac outlet and/or at least one Type a interface.

3. The inverter according to claim 1, further comprising a temperature detection unit electrically connected to the control board and collecting a temperature of the control board and/or the accommodation chamber.

4. The inverter of claim 1, wherein the housing comprises a first housing and a second housing, the first housing and the second housing are detachably connected and surround to form the accommodating cavity, and at least two sets of ventilation openings are provided on the first housing and/or the second housing to communicate the accommodating cavity with the outside.

5. The inverter according to claim 1, wherein the housing comprises a first housing and a second housing, the first housing and the second housing are detachably connected and surround to form the accommodating cavity, at least two sets of ventilation openings are arranged on the first housing and/or the second housing, and at least one set of ventilation openings is arranged on the housing opposite to the contact interface of the battery pack.

6. The inverter according to claim 4 or 5, further comprising a fan mounted on a wall of the housing or in the receiving cavity and electrically connected to the input connection terminal or the output terminal of the inverter circuit, so as to drive the cooling air flow to flow in from one set of the ventilation openings and flow out from the other set of the ventilation openings.

7. The inverter of claim 1, wherein a sliding connection portion is disposed at a contact interface between the housing and the battery pack, and the input terminal is electrically connected to the output terminal of the battery pack when the battery pack slides from a first position to a second position of the sliding connection portion.

8. The inverter according to claim 7, wherein the sliding connection portion includes a pair of guide rails provided on one of the battery pack or the housing, and a guide groove provided correspondingly on the other of the battery pack or the housing, and a locking member that locks the battery pack or the housing relative to each other.

9. The inverter according to claim 7, further comprising a switch button electrically connected to the control board, the switch button controlling the inverter to be turned on and off; the switch key is positioned on the outer side wall parallel or approximately parallel to the sliding direction of the sliding connection part.

10. A power supply system comprising a battery pack, and further comprising an inverter electrically connected to the battery pack, the inverter comprising:

the input connection end is arranged on the shell, one end of the input connection end is electrically connected with the input terminal of the inverter circuit, and the other end of the input connection end is detachably and slidably electrically connected with the output terminal of the battery pack;

the output interface group is arranged on the shell and is electrically connected with the output terminal of the inverter circuit; wherein the output interface set includes at least one interface supporting a power transfer protocol.