Patent Publication Number: US-2023152877-A1

Title: A dynamic power sharing dual usb type c and power delivery receptacle

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Patent Application Ser. No. 17/488,851, filed Sep. 29, 2021, which is incorporated by reference herein. 
    
    
     BACKGROUND 
     Field 
     The disclosed concept relates generally to receptacles, and in particular, to dynamic power sharing dual USB Type C &amp; Power Delivery (PD) receptacles. 
     Background Information 
     Electricity is often provided to electric devices via an electrical receptacle in the wall or floor of a room. Electrical receptacles are usually duplex-type electrical receptacles that include two sockets coupled together with a common housing. Each socket is able to electrically connect to and provide power to one power cord. 
     Some types of receptacles have replaced one of their sockets with one or more universal serial bus (USB) ports. The receptacle will include circuitry to convert utility power to that which is usable by the USB ports. The receptacle also needs to include a controller to control operation of the USB ports. The USB ports can be used to charge a variety of electronic devices such as phones and tablets. 
     The USB power delivery (PD) technology has helped significantly to charge the electronic devices very fast due to increased power capacity required by the USB PD standards. For example, more current USB standards provide increased power capacity requirements for USB ports, including 100 Watts (e.g., 20V@5 A), whereas under the USB Charging Specification 3.0 the maximum power that can be provided is 4.5 Watts (e.g., 0.9 A@5V). The USB PD supports a single adapter for numerous devices through a feature that negotiates with an attached device to learn the device&#39;s charging voltage. The normative voltages in USB PD include 5V, 9V, 15V and 20V. This negotiating feature enables the adapter to adjust the voltage and power delivery for on-the-fly compatibility with everything from small devices that need mill watts (mW) of power to large laptops that need higher power. For example, a cellphone needs 5V, whereas a laptop needs 20V. However, the adoption of the new PD standards in USB Wall receptacles poses challenges in having to fit the increased power capacity in the standard USB Wall receptacle form factor. 
     There is room for improvement in USB power sharing. 
     SUMMARY 
     These needs and others are met by embodiments of the disclosed concept in which a dynamic power sharing dual USB Type C &amp; power delivery (PD) receptacle is provided. 
     In accordance with one aspect of the disclosed concept, a receptacle includes: a plurality of universal serial bus (USB) ports comprising a USB Type C power delivery (PD) port and USB Type C port, the USB ports couplable to respective devices for charging; a controller coupled to the USB Type C PD port and the USB Type C port, the controller comprising a dynamic power sharing logic and structured to (i) determine whether one or more USB ports are coupled to the respective devices, and (ii) manage a first power negotiation and dynamic power sharing between the USB Type C PD port and the USB Type C port based on a determination that both the USB Type C PD port and the USB Type C port are coupled to the respective devices, or manage a second power negotiation between one USB port and the respective device based on a determination that only the one USB port is coupled to the respective device; an alternating current to direct current (AC/DC) converter including a gallium nitride (GaN) MOSFET on at least one of the primary side or the secondary side of the AC/DC converter, the AC/DC converter coupled to the controller and structured to provide high power to the USB Type C PD port; and a DC/DC converter coupled to the controller and the AC/DC converter and structured to receive DC from the AC/DC converter and provide low power to the USB Type C port. 
     In accordance with another aspect of the disclosed concept, a method of dynamic power sharing using a dual universal serial bus (USB) Type C receptacle includes initializing power for the dual USB Type C receptacle comprising a plurality of USB ports including a USB Type C power delivery (PD) port and a USB Type C port, the USB ports being couplable to respective devices for charging; determining whether one or more USB ports are coupled to the respective devices for charging; and managing a first power negotiation and dynamic power sharing between the USB Type C PD port and the USB Type C port based on a determination that both the USB Type C PD port and the USB Type C port are coupled to the respective devices for charging, or managing a second power negotiation between one USB port and the respective device for charging based on a determination that only the one USB port is coupled to the respective device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A full understanding of the disclosed concept can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which: 
         FIG.  1    is a diagram of a USB PD system in accordance with an example embodiment of the disclosed concept; 
         FIG.  2    is a front view of an example receptacle in accordance with an example embodiment of the disclosed concept; 
         FIGS.  3 A-B  illustrate power profiles of USB ports being advertised in accordance with example embodiments of the disclosed concept; 
         FIG.  4    is a schematic diagram of circuitry of a receptacle in accordance with an example embodiment of the disclosed concept; 
         FIG.  5    is a schematic diagram of circuitry of a receptacle in accordance with an example embodiment of the disclosed concept; and 
         FIG.  6    is a flow chart for an example method for dynamic power sharing accordance with an example embodiment of the disclosed concept. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Directional phrases used herein, such as, for example, left, right, front, back, top, bottom and derivatives thereof, relate to the orientation of the elements shown in the drawings and are not limiting upon the claims unless expressly recited therein. 
     As employed herein, the statement that two or more parts are “coupled” together shall mean that the parts are joined together either directly or joined through one or more intermediate parts. 
     The USB power delivery (PD) technology has helped significantly to charge the electronic devices extremely fast due to increased power capacity required by the USB PD standards. For example, more current USB standards provide increased power capacity requirements including, e.g., 100 W (e.g., 20V@5 A), whereas under the USB Charging Specification 3.0 the maximum power that can be provided is 4.5 Watts (e.g., 0.9 A@5V). The USB PD supports a single adapter for numerous devices through a feature that negotiates with attached device(s) to learn the device&#39;s charging voltage. The normative voltages in USB PD include 5V, 9V, 15V and 20V. The negotiating feature enables the adapter to adjust the voltage and power delivery for on-the-fly compatibility with everything from small devices that need mill watts (mW) of power to large devices that need higher power (e.g., without limitation 100 W). For example, a cellular phone needs 5V, whereas a laptop needs 20V. If a cellular phone is coupled to a USB port of the USB wall receptacle, then upon power initialization, the USB port and the cellular phone undergo power negotiation. During the power negotiation, the USB port advertises its power profile and the cellular phone acknowledges the advertisement. In response, the cellular phone transmits its power requirement to the USB port. The USB port then acknowledges receipt of the power requirement and transmits a reply (e.g., PS_ready) indicating that it is capable of providing the required power to the cellular phone. The cellular phone then activates VBus and receives the power from the USB port for charging. 
     However, the adoption of the new USB standards poses challenges in having to fit the increased power capacity required under the new standards in the conventional USB Wall receptacle form factor, which is governed by the NEMA standard. For example, high efficiency, high density power supply solutions satisfying the increased power capacity requirement under the standards are needed. Such solutions enable multiple power supply stages, which is adding the hardware components as well as overall cost of the system.. That is, in order to meet the increased power capacity requirement, additional hardware (e.g., a higher power supply circuit) may need be added within the USB Wall receptacle, requiring a design change, and thus increasing manufacturing costs. In order to overcome this challenge, the dynamic power sharing dual USB Type C receptacle in accordance with the present disclosure utilizes two power stages using a dynamic power sharing logic, allowing the USB ports to simultaneously and dynamically share power in a fast and efficient manner without compromising power capacity and power density. 
     The two power stages include the first power stage, which is the AC/DC power-conversion stage using a conventional AC/DC converter, and the second power stage, which is the DC/DC power-conversion stage using a conventional DC/DC converter. The AC/DC converter may be, e.g., without limitation, flyback topology, and provides power directly to a USB Type C PD port. As the DC power is not reduced or stepped down, the AC/DC converter is capable of providing high power (e.g., without limitation, 45 W) to the USB Type C PD port for charging a device (e.g., without limitation, a laptop) requiring the high power via a MOSFET. The second power stage uses a high-efficiency DC/DC converter with, e.g., without limitation, a buck converter, a buck boost converter, etc. The DC/DC converter is coupled to the AC/DC converter and structured to step down the DC voltage received from the AC/DC converter to a low voltage sufficient to power a device (e.g., without limitation, a cellular phone) requiring low power (e.g., without limitation, up to 15 W) for charging via another MOSFET. 
     The novel two power stages allow the USB ports to simultaneously charge devices at different power capacities using different voltage ratings unlike the conventional USB receptacles that must pull down the voltage rating of the USB Type C PD port to the same constant 5V which the USB Type C port supplies to its attached device. Since the USB Type C PD port&#39;s voltage rating need not be reduced to the constant 5V, the USB Type C PD port of the dynamic power sharing dual USB Type C &amp; PD receptacle is still capable of charging the attached device at high power capacity. As such, the USB ports may negotiate and share power in accordance with the dynamic power sharing. For example, assume that the dynamic power sharing dual USB Type C &amp; PD receptacle has a total power capacity at 60 W, the USB Type C port is coupled to a cellular phone and the USB Type C PD port is coupled to a laptop. The USB Type C port has maximum power capacity of 15 W and has a constant 5V rating with an adjustable current. If the USB Type C port advertises a power profile including a 15 W power rating and a voltage and current rating of 5V@3 A, then the USB Type C PD port under the dynamic power sharing logic may still advertise a power profile including a power rating representing the remaining power capacity and its variable voltage and current ratings. In this example, the power rating of the USB Type C PD port advertises would be 45 W (total power capacity (60 W)—USB Type C port advertised power capacity(15 W)), and the voltage and current ratings may include 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A. Upon acceptance by the attached devices and receipt of a PS_ready message, the USB Type C PD port may provide  4 5 W at 15V to the laptop while the USB Type C port supplies 15 W at 5V to the cellular phone. As such, by allowing the USB ports to charge devices at different power ratings with different voltage ratings, the two power stages and the dynamic power sharing logic maximize the full power capacity of the receptacle without having to waste power capacity or comprising power density and charging time, thereby increasing the efficiency and optimizing the power density. 
     In some embodiments, one or more MOSFETs may be gallium nitride (GaN) MOSFETs. For example, a GaN MOSFET is used in the AC/DC power-conversion stage for the primary side to improve the efficiency and power density. In some examples, a GaN MOSFET may also be used in the secondary side of the AC/DC power converter to further improve the efficiency. A GaN MOSFET is smaller and faster than a conventional silicon MOSFET. For example, a GaN MOSFET has four times faster turn-on times than a silicon MOSFET. Further, a GaN MOSFET operates at higher voltages and lower leakage currents than a silicon MOSFET, resulting in higher power density. Additionally, a GaN MOSFET has higher electron mobility than the silicon or silicon carbide MOSFET, suitable for high frequencies. Thus, a GaN MOSFET can be easily fit within a USB Wall socket due to its small size and significantly improves efficiency by fast charging with high power density. 
       FIG.  1    is a schematic diagram of a USB charging system  100  in accordance with an example embodiment of the disclosed concept. The USB charging system  100  may include a dynamic power sharing dual USB Type C&amp; PD receptacle  1 , devices  3 A, 3 B coupled to the dynamic power sharing dual USB Type C receptacle  1  for charging, and a power source  4 . The dynamic power sharing dual USB Type C receptacle  1  may charge the devices  3 A, 3 B with power received from the power source  4  via the USB charging cables  5 A, 5 B. The dynamic power sharing dual USB Type C receptacle  1  may include a socket  10  and a USB connection area  20  including USB Type C PD port  22  and USB Type C port  24  (hereinafter, collectively referred to as USB ports). The socket  10  may be coupled to the power source  4  via a power cable  6  or wirelessly, and may be structured and configured to receive utility power (e.g., 120 Vac) from the power source  4 . A USB Type C PD port  22  is a power delivery (PD) port capable of delivering higher power (e.g., more than 15 W). A USB type C port  24  outputs power up to 15 W, and thus, is structured to deliver low power to devices (e.g., without limitation, a cellular phone  3 A) requiring low charging power (e.g., up to 15 W). The USB ports  22 , 24  may be coupled to the power source  4  via the power cable  6  or wirelessly and structured to receive power from the power source  4 . The USB ports  22 , 24  are couplable to the devices  3 A, 3 B and structured to charge these devices  3 A, 3 B via USB charging cables  5 A, 5 B. The USB ports  22 , 24  are structured and configured to receive USB Type C connectors. In some examples, the dynamic power sharing dual USB Type C receptacle  1  may include a display (not shown) to display real-time power information, including a voltage and current rating and power rating for each USB port. The devices  3 A, 3 B may be any devices or systems chargeable by the USB PD ports  22 , 24 , e.g., a handheld device, a tablet, a netbook, a laptop, a notebook, a hub, a dock, a workstation, etc. The power source  4  may be a power station, a power plant, etc. 
       FIG.  2    is a front view of an example dynamic power sharing dual USB Type C &amp; PD receptacle  1  in accordance with an example embodiment of the disclosed concept. The dynamic power sharing dual USB Type C receptacle  1  includes a traditional socket  10 , a USB connection area  20  including USB Type C PD port  22  and USB Type C port  24 . The socket  10  and/or the USB connection area  20  may be coupled to a power supply, e.g., a flyback circuit (discussed in detail with reference to  FIG.  4   ), which may convert AC utility power to DC power for use by the socket  10  and/or the USB ports  22 , 24 . The USB ports  22 , 24  are discussed further in detail with reference to  FIGS.  4  and  5   . While  FIG.  2    shows a USB Wall receptacle with single socket  10 , this is for illustrative purposes only and the receptacle may include more than one socket, e.g., a duplex socket. 
       FIGS.  3 A-B  illustrate example power profiles of USB ports  22 , 24  being advertised in accordance with example embodiments of the disclosed concept.  FIG.  3 A  shows a power profile of a USB Type C PD port  22  of a dynamic power sharing dual USB Type C &amp; PD receptacle  1  when only the USB Type C PD port  22  is active and connected to a device for charging. The power profile includes power rating up to60 W and voltage and current ratings including 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A.  FIG.  3 B  shows power profiles of the USB ports  22 , 24  when both USB Type C PD port  22  and USB Type C port  24  are active and connected to respective devices for charging using dynamic power sharing. The profiles show the power profile of the USB Type C PD port  22  with the power rating up to 45 W (i.e., total power capacity (60 W)—the advertised power of the USB Type C port  22  (15 W)), and the power profile of the USB Type C port  24  with the power rating up to  15  W and a voltage/current rating including 5V@3 A. 
       FIG.  4    is a schematic diagram of circuitry of the dynamic power sharing dual USB Type C receptacle  1  in accordance with an example embodiment of the disclosed concept. The circuitry includes an AC/DC converter  30 , a DC/DC converter  40 , a dual Type C PD controller  50  including a dynamic power sharing logic, a linear regulator  60 , and a USB Type C PD port  22  and a USB Type C port  24  (hereinafter, collectively referred to as USB ports  22 , 24 ). The USB ports  22 , 24  may receive power for, e.g., charging respective devices (e.g., the devices  3 A, 3 B as described with reference to  FIG.  1   ) connected to the USB ports  22 ,  24  via USB charging cables  5 A, 5 B. The USB ports  22 ,  24  may be smart USB ports in that the USB ports  22 ,  24  each may allow devices  3 A, 3 B to specify the amount of power the devices  3 A, 3 B need for charging during power negotiation and disconnect the current once the devices  3 A, 3 B are fully charged. The USB ports  22 , 24  are structured and configured to receive USB Type C connectors, and advertise power profile(s) depending on whether one or both USB ports are active. 
     The USB Type C PD port  22  is structured to receive power from the AC/DC converter  30  and is couplable to a first device  3 A, 3 B for charging. When connected, the USB Type C PD port  22  supplies power to the first device  3 A, 3 B. Generally, the USB Type C PD port  22  supplies high power to devices requiring more than 15 W for charging, but may supply power to any devices requiring different levels of power profiles for charging (e.g., up to 15 W, 100 W, 240 W, etc.). The USB Type C port  24  is couplable to a second device  3 A for charging and structured to receive power from a DC/DC converter  40  and supply low power up to 15 W to the second device  3 A, when connected. 
     The AC/DC converter  30  is coupled to the dual Type C &amp; PD controller  50  (specifically, a MOSFET  56  included in the dual Type C PD controller  50 ), and structured to receive utility power from an AC power source  4  and convert AC to DC power for use by the USB ports  22 , 24 . When both USB ports  22 , 24  are connected for simultaneous charging of respective devices  3 A, 3 B, the AC/DC converter  30  acts as a first power stage and provide DC power to the USB Type C PD port  22  at a first power rating. The first power rating includes high power (i.e., greater than 15 W) to the USB Type C PD port  22  via the MOSFET  56  for charging the first device requiring charging power greater than 15 W. The AC/DC converter  30  may be, e.g., flyback topology and is coupled to the MOSFET  56 , which in turn is coupled to a USB Type C PD port  22 . Further, the AC/DC converter  30  also includes a GaN MOSFET  32  for the primary side to improve the efficiency and power density. In some examples, a GaN MOSFET  32  may also be used in the secondary side of the AC/DC power converter to further improve the efficiency. As such, the GaN MOSFET  32  with secondary-side synchronous rectification helps to improve the power density as well as optimize the overall design. As the DC power is not reduced or stepped down, the AC/DC converter  30  is capable of providing high power to charge the first device (e.g., a laptop) requiring high charging power (e.g., greater than 15 W). The MOSFET  56  may be any MOSFET (e.g., a silicon MOSFET, etc.), however, to improve efficiency, it may be a GaN MOSFET. 
     The DC/DC converter  40  is coupled to the AC/DC converter  30  and the dual Type C &amp; PD controller  50  (specifically, a MOSFET  58  within the controller  50 ). The DC/DC converter  40  is structured to receive the DC power from the AC/DC converter  30 , reduce or step down the DC voltage to a low voltage, e.g., 5V, and provide low power to the USB Type C port  24  at a second power rating (e.g., up to 15 W). The DC/DC converter  40  may be, e.g., without limitation, a buck converter, a buck boost converter, etc. and coupled to a linear regulator  60 . The linear regulator  60  keeps the reduced voltage constant (e.g., at 5V). The MOSFET  58  is coupled to the USB Type C port  24  and structured to turn on the USB Type C port  24  to supply power to the second device  3 A requiring low power (e.g., up to 15 W) for charging. The MOSFET  58  may be any MOSFET (e.g., a silicon MOSFET, GaN MOSFET, etc.). When both USB ports  22 , 24  are connected to the first and second devices  3 A, 3 B for simultaneous charging, the DC/DC converter  40  is structured to act as a second power stage providing the low constant voltage (e.g., 5V) to the USB Type C port  24  via the MOSFET  58  for charging the second device  3 A. 
     The two power stages with the dynamic power sharing logic in accordance with the present disclosure are novel in that they eliminate the requirement to pull down the power rating or voltage rating during power sharing so as to supply the same power at the same constant voltage as is required by the conventional USB ports in USB Wall receptacles. For example, for a conventional USB Wall receptacle having a total power capacity at 60 W, in order to simultaneously charge a cellular phone with a voltage and current rating of 5V@3 A and a laptop with voltage and current ratings of 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A, both the USB ports supply maximum common power capacity and voltage rating at 15 W and 5V. Thus, a USB Type C PD port in a conventional USB Wall receptacle, which is capable of supplying the maximum power at 60 W with the voltage rating at 20V in this example, is required to not only bring down its voltage rating from 20V to 5V in order to provide the same constant 5V rating during power sharing, but also forego power capacity of up to 30 W by having to supply power at the reduced 5V rating. Such arbitrary reduction of voltage and power capacity is inefficient and wasteful. By having the two power stages, the dynamic power sharing dual USB Type C receptacle  1  eliminates such waste and inefficiencies and maximize the utilization of power capacity. For example, for the dynamic power sharing dual USB Type C receptacle  1  having the same total power capacity at 60 W, when both the USB ports  22 , 24  are coupled to the first and second devices  3 A, 3 B for charging, the two power stages allow the USB Type C PD port  22  to supply to the first device a high power up to 45 W (i.e., total power capacity(60 W)—USB Type C port advertised power capacity (15 W)) at 5V, rather than 15 W at 5V. In short, the two power stages with the dynamic power sharing logic enable true power sharing between the USB ports  22 , 24 , utilizing the full power capacity of the receptacle  1  without compromising power density and charging time. 
     The dual Type C &amp; PD controller  50  is coupled to the AC/DC converter  30 , the DC/DC converter  40 , linear regulator  60 , and the USB ports  22 , 24 . The dual Type C &amp; PD controller  50  includes MOSFETs  56 , 58 , a processor and memory (not shown). The processor may be, for example and without limitation, a microprocessor, a microcontroller, or some other suitable processing device or circuitry. The memory can be any of one or more of a variety of types of internal and/or external storage media such as, without limitation, RAM, ROM, EPROM(s), EEPROM(s), FLASH, and the like that provide a storage register, i.e., a machine readable medium, for data storage such as in the fashion of an internal storage area of a computer, and can be volatile memory or nonvolatile memory. The memory may include the dynamic power sharing logic. The dynamic power sharing logic is a firmware, a software, codes, instructions, etc., for performing dynamic power sharing between the USB ports  22 , 24 . 
     The dual Type C &amp; PD controller  50  is structured to: determine whether one or more USB ports  22 , 24  are coupled to the respective devices for charging; and manage a first power negotiation and dynamic power sharing between the USB Type C PD port and the USB Type C port based on a determination that both the USB Type C PD port and the USB Type C port are coupled to the respective devices  3 A, 3 B for charging, or manage a second power negotiation between one of the USB ports  22 , 24  and the respective device  3 A, 3 B for charging based on a determination that only one USB port  22 , 24  is coupled to the respective device  3 A, 3 B. The first power negotiation comprises negotiating power output of the USB Type C PD port  22  with the first device based at least in part on the first power profile and a power profile of the first device and negotiating power output and current of the USB Type C port  24 . The USB Type C port  24  may provide maximum power of 15 W (e.g., 5V@3 A) as per the device connected but the voltage remains the same (e.g., 5V). As such, the maximum power capacity and the variable current rating of the USB Type C port  24  may be advertised during the first power negotiation. Managing the second power negotiation includes negotiating power output of the USB Type C PD port  22  with the first device based on a determination that only the USB Type C PD port  22  is coupled to the first device for charging, or negotiating power output of the USB Type C port  24  with the second device based on a determination that only the USB Type C port  24  is coupled to the second device for charging. The USB Type C PD port  22  advertises the power profile of the USB Type C PD port  22  during the negotiation. The USB Type C port  24  advertises the power profile of the USB Type C port  24  during the negotiation. 
     The dual Type C &amp; PD controller  50  manages the dynamic power sharing between the USB ports  22 , 24  when both USB ports  22 , 24  are coupled to respective devices  3 A, 3 B for charging. The dynamic power sharing includes activating the dynamic power sharing logic; advertising a first power profile of the USB Type C PD port  22  and a second power profile of the USB Type C port  24 , the first power profile including the first power rating and a first voltage and current rating and the second power profile including the second power rating and a second voltage and current rating; and simultaneously charging the respective devices by the USB Type C PD port  22  using the first power rating and by the USB Type C port  24  using the second power rating. The simultaneously charging the respective devices  3 A, 3 B includes receiving, by the USB Type C PD port  24 , high power from the AC/DC converter  30  via the MOSFET  56  coupled to the AC/DC converter  30  and the USB Type C PD port  22 , and supplying the high power to the first device by the USB Type C PD port  22 ; and receiving, by the USB Type C port  24 , low power from the DC/DC converter  40  via the MOSFET  58  coupled to the DC/DC converter  40  and the USB Type C port  24 , and supplying the low power to the second device by the USB Type C port  24 . The first power rating is equal to a difference between a total power capacity of the receptacle  1  and the second power rating. The second power rating may be 15 W. The first voltage and current rating includes voltage ratings including at least one of 5V, 9V, 12V, 15V, or 20V. The second voltage and current rating includes a voltage rating of constant 5V. As such, the dynamic power sharing in accordance with the present disclosure allows the USB ports  22 , 24  to supply charging power to the attached devices  3 A, 3 B at different power capacities and voltage ratings, thereby maximizing the utilization of power capacity, optimizing the power density, and increasing the efficiency. 
       FIG.  5    is a schematic diagram of circuitry of the dynamic power sharing dual USB Type C receptacle  1 ′ in accordance with an example embodiment of the disclosed concept. The circuitry of the dynamic power sharing dual USB Type C receptacle  1 ′ is the same with the circuity of the dynamic power sharing dual USB Type C receptacle  1  of  FIG.  5   , except in that it includes external MOSFETS  56 , 58 , a Type C PD controller  50 A for controlling the USB Type C PD port  22  and a Type C controller for controlling the USB Type C port  24 . As such, any overlapping descriptions of any features in  FIG.  5    are omitted for brevity. The controllers  50 A, 50 B are structured to manage power negotiation and dynamic power sharing between the USB ports. The MOSFETS  56 , 58  are external to the controllers  50 A, 50 B so as to allow using bigger MOSFETs for faster charging. The MOSFETs  56 , 58  may be any MOSFET (e.g., silicon MOSFET, GaN MOSFETs, etc.). The MOSFETs  56 , 58  are structured to turn on the USB ports  22 , 24  for charging the first and second devices. Assuming the dynamic power sharing dual USB Type C receptacle  1 ′ has a total power capacity of 60 W, if only the USB Type C PD port  22  is active and connected to a first device, the USB Type C PD port  22  advertises a power profile including the full power rating at 60 W and variable voltage and current ratings including 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A. Upon acceptance by the first device of advertised charging capacities of the USB Type C PD port  22  and reception of a PS_ready message, the Type C PD controller  50 A causes the MOSFET  56  to turn on the USB Type C PD port  22 , which in turn supplies the power at the accepted voltage and current rating by the first device. In another example, if only the USB Type C port  24  is active and connected to the second device, the USB Type C port  24  advertises its power profile including a power rating at, e.g., without limitation, 15 W maximum power with variable current at constant 5V rating (e.g., a 5V@3 A). Upon acceptance of the advertised power profile by the second device and reception of a PS_ready message, the Type C controller  50 B causes the MOSFET  58  to switch to turn on the USB Type C port  24 , which in turn supplies the power at 15 W with 5V@3 A to the second device for charging. In yet another example, if both the USB Type C PD port  22  and the USB Type C port  24  are active and connected to respective first and second devices for simultaneous charging, under the dynamic power sharing logic the USB Type C port  24  advertises the maximum 15 W power capacity with variable current with constant 5V (e.g., 5V@3 A) rating and the USB Type C port  22  advertises the remaining power 45 W with its variable voltage and current ratings including 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A. Upon acceptance of the advertised power capacity and voltage and current rating by the first and second devices and reception of a PS_ready message, the Type C PD controller  50 A and Type C controller  50 B cause respective MOSFETs  56 , 58  to turn on respective USB ports  22 , 24 . 
       FIG.  6    is a flow chart for an example method  600  for dynamic power sharing in accordance with an example embodiment of the disclosed concept. The method  600  may be performed by a dynamic power sharing dual USB Type C &amp; PD receptacle  1 , 1 ′ as described with reference to  FIGS.  1 ,  2 ,  4  and  5    and/or any components thereof in accordance with an example embodiment of the disclosed concept. 
     At  610 , power initialization of the dynamic power sharing dual USB Type C &amp; PD receptacle occurs. The dynamic power sharing dual USB Type C &amp; PD receptacle includes a USB Type C PD port for powering a device requiring high power (e.g., without limitation, more than 15 W charging power) and a USB Type C port for charging a device requiring low power up to 15 W. The USB Type C PD port and the USB Type C port are collectively referred to as USB ports. 
     At  620 , the dynamic power sharing dual USB Type C &amp; PD receptacle (specifically, a dual Type C PD controller, Type C PD controller, or Type C controller, hereinafter individually and/or collectively referred to as the “controller”) determines whether one or more USB ports are connected to a device(s) for charging via a USB Type C cable(s) and detects the device(s) connected. If one or more USB ports are connected and the device(s) connected are detected, the method  600  proceeds to  630 . If not, the method  600  ends. 
     At  630 , the controller determines whether both the USB Type C PD port and the USB Type C port are connected to respective devices for charging. If yes, the method  600  proceeds to  640 . If no, the method  600  proceeds to  632 , and at  632  the controller determines whether the USB Type C PD port is connected to a device for charging. If yes, the method  600  proceeds to  634 A at which the USB Type C PD port advertises its power profile including total power capacity of the receptacle and voltage and current rating of the USB Type C PD port. If no, the method  600  proceeds to  634 B at which the USB Type C port advertises its power profile including a power rating at 15 W with voltage and current rating of 5V@3 A. If respective device accepts the advertised power capacity and voltage and current rating, the USB Type C PD port or the USB Type C port charges respective device. During and/or subsequent to this charging, the method  600  returns to  630  at which the controller checks whether both the USB ports are connected for charging. 
     At  640 , the USB ports perform power negotiation and activate a dynamic power sharing logic. The dynamic power sharing logic is a firmware, a software, codes, or instructions, etc., enabling the USB ports to simultaneously charge the respective devices and share power among the USB ports. The dynamic power sharing logic allows the USB Type C PD port retain variable voltage ratings (e.g., 5V, 9V, 15V or 20V) while the USB Type C port&#39;s voltage rating remains at constant at 5V during charging. The method  600  proceeds to  650 A and  650 B under the dynamic power sharing logic. 
     At  650 A, the USB Type C port advertises maximum power capacity (i.e., 15 W) and variable current (e.g., 3 A, 5 A, etc.). At  650 B, the USB Type C PD port advertises its power profile including its variable voltage and current rating (e.g., 5V@3 A, 9V@3 A, 15V@3 A and 20V@3 A) and power capacity which is equivalent to the difference between the total power capacity of the dynamic power sharing dual USB Type C dynamic power sharing dual USB Type C receptacle and the Type C port advertised power. That is, 45 W if the total power capacity is 60 W. 
     At  660 , the controller determines whether it has received acceptances for the advertised power capacities and voltage and current ratings from respective devices. If yes, the method  600  proceeds to  670 . If no, the method  600  ends. 
     At  670 , the USB ports charge the respective devices attached for charging. Upon completion of charging the respective devices, the method  600  ends. 
     While specific embodiments of the disclosed concept have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the disclosed concept which is to be given the full breadth of the claims appended and any and all equivalents thereof.