Patent Publication Number: US-2022232736-A1

Title: Cooling device and data processing apparatus

Description:
TECHNICAL FIELD 
     The present disclosure generally relates to the cooling technology field, for example, to a cooling device and a data processing apparatus. 
     BACKGROUND 
     The data processing apparatus usually is equipped with a specialized processing chip to improve processing efficiency. The specialized data processing chip often are densely packed in the data processing apparatus, which causes a heat generation problem of the data processing apparatus. 
     In the related technology, the endothermic phase change is used to cool a single chip. To dissipate heat of a large number of densely placed chips in the data processing apparatus, there has been no good solutions applying the current endothermic phase change technology. 
     SUMMARY 
     Embodiments of the present disclosure provide a cooling device and a data processing apparatus to improve the cooling efficiency of the data processing apparatus. 
     In a first aspect, embodiments of the present disclosure provide a cooling device, including a housing and a heat dissipation assembly. A sealed space for accommodating cooling liquid is formed in the housing. The cooling liquid is in contact with a to-be-cooled component. The heat dissipation assembly includes a heat dissipation assembly body and a heat conducting pipe communicating with the heat dissipation assembly body. The heat dissipation assembly body is arranged in the sealed space formed by the housing. The heat dissipation assembly body is configured to, after the cooling liquid transforms into a gas by absorbing heat of the to-be-cooled component, absorb heat of the gas to convert the gas into the liquid. The heat conducting pipe is at least partially located outside of the housing. The heat dissipation assembly body is arranged at ½ to ¾ position along a height direction of the housing, and the heat dissipation assembly body divides the sealed space into a first space for accommodating the cooling liquid and the to-be-cooled component and a second space for maintaining pressure. 
     In a possible embodiment, the heat dissipation assembly body further includes a cooling pipe and a plurality of heat dissipation fins arranged at the cooling pipe. The heat conducting pipe communicates with the cooling pipe. 
     In a possible embodiment, the heat dissipation assembly body further includes a first container and a second container arranged opposite to each other. The cooling pipe includes a plurality of rows of pipes arranged in parallel. An end of the cooling pipe communicates with the first container, and another end of the cooling pipe communicates with the second container to circulate heat-exchange liquid in the first container, the cooling pipe, and the second container. 
     In a possible embodiment, the heat conducting pipe includes a liquid inlet pipe and a liquid outlet pipe. The first container includes a liquid inlet and a liquid outlet at top of the first container. The liquid inlet pipe is connected to the liquid inlet. The liquid outlet pipe is connected to the liquid outlet. 
     In a possible embodiment, the cooling pipe includes a flat pipe. 
     In a possible embodiment, a wave-shaped heat dissipation fin is arranged in a gap between neighboring cooling pipes. 
     In a possible embodiment, the cooling pipe is inserted in the heat dissipation fin through a Fin insertion process. The cooling pipe includes an inlet and an outlet. The heat conducting pipe includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is connected to the inlet of the cooling pipe. The liquid outlet pipe is connected to the outlet of the cooling pipe. 
     In a possible embodiment, the cooling device further includes at least one fan. The fan is arranged in the second space and configured to enhance the flow of the gas. 
     In a possible embodiment, the fan is arranged at the heat dissipation assembly body. An air outlet of the fan faces the heat dissipation assembly body. The fan adjusts a rotation speed according to the pressure of the sealed space. 
     In a possible embodiment, a wire hole is arranged at the housing and configured to arrange a power cord through. The power cord is configured to provide power to the to-be-cooled component and the fan. The wire hole is sealed through a seal material. 
     In a possible embodiment, the cooling device further includes a third container. The third container is arranged outside of the housing. The third container communicates with the heat conducting pipe. 
     In a possible embodiment, the cooling liquid is insulation liquid. A boiling point of the cooling liquid is lower than a predetermined threshold. 
     In a possible embodiment, the to-be-cooled component is a hashboard. A plurality of data processing chips are arranged at the hashboard. 
     In a second aspect, embodiments of the present disclosure provide a data processing apparatus, including a data processing apparatus and a cooling device according to any one of the first aspects. 
     In the cooling device and the data processing apparatus provided by embodiments of the present disclosure, the cooling liquid may be accommodated inside an outer housing of the cooling device. After the cooling liquid transforms into the gas by absorbing the heat of the to-be-cooled assembly, the gas is converted into the liquid through the heat dissipation assembly. Thus, the to-be-cooled assembly is cooled. The cooling efficiency is high. The cooling liquid is circulated and used. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       One or more embodiments are exemplarily described by the accompanying drawings. These exemplary descriptions and the accompanying drawings do not constitute a limitation on embodiments of the present disclosure. Elements with same reference numerals in the accompanying drawings are shown as similar elements. The accompanying drawings do not constitute a ratio limitation, and among them: 
         FIG. 1  is a schematic front view structural diagram of a cooling device according to an embodiment of the present disclosure; 
         FIG. 2  is a schematic structural diagram of a partial outer housing of the cooling device according to an embodiment of the present disclosure; 
         FIG. 3  is a schematic front view structural diagram of a cooling device according to another embodiment of the disclosure; 
         FIG. 4A  is a schematic top view structural diagram showing a body of a heat dissipation assembly according to an embodiment of the present disclosure; 
         FIG. 4B  is a schematic front view structural diagram showing the body of the heat dissipation assembly according to an embodiment of the present disclosure; 
         FIG. 5  is a schematic top view structural diagram showing the body of the heat dissipation assembly according to an embodiment of the present disclosure; 
         FIG. 6  is a schematic front view structural diagram of the cooling device according to another embodiment of the present disclosure; 
         FIG. 7  is a schematic top view structural diagram of the cooling device according to another embodiment of the present disclosure. 
     
    
    
     REFERENCE NUMERALS 
     
         
           10  Cooling device; 
           101  Outer housing; 
           102  Heat dissipation assembly; 
           1021  Heat dissipation assembly body; 
           1022  Heat conducting pipe; 
           1023  Cooling pipe; 
           1024  Heat dissipation fin; 
           1025  First container; 
           1026  Second container; 
           1027  Liquid inlet; 
           1028  Liquid outlet; 
           1011  Container body; 
           1012  Bottom plate; 
           1013  Side plate; 
           103  Third container; 
           104  Fan; 
           105  Electrical wire hole; 
           106  Opening hole. 
       
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     To understand the features and technical content of the embodiments of the present disclosure with more details, implementation of embodiments of the present disclosure is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not used to limit embodiments of the present disclosure. In the following technical description, to facilitate explanation, a number of details are used to provide a sufficient understanding of the disclosed embodiments. However, without these details, one or more embodiments can still be implemented. In other cases, to simplify the accompanying drawings, well-known structures and devices may be simplified for display. 
     In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms “up,” “down,” “front,” “rear,” “left,” “right,” etc. are based on the orientation or position relationship indicated by the accompanying drawings. The terms are only to facilitate to simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in the specific orientation. Therefore, the terms cannot be understood as a limitation of the present disclosure. 
     In the description of the present disclosure, unless otherwise clearly defined and limited, the terms “installed,” “connected,” “coupled,” “fixed,” and other terms should be understood in a broad sense. For example, it may include a fixed connection, a detachable connection, or integrated. It may also be directly connected or indirectly connected through an intermediate medium. It may be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure may be understood according to specific situations. 
     In the present disclosure, unless otherwise clearly defined and limited, a first feature “on” or “under” a second feature may include that the first and the second features are in direct contact, or the first and second features may be indirect contact through an intermediate medium. Moreover, the first feature “above,” “over,” and “on” the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely mean that the horizontal height of the first feature is higher than the second feature. The first feature “below,” “under,” and “beneath” the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely mean that the horizontal height of the first feature is smaller than the second feature. 
     First, application scenarios involved in embodiments of the present disclosure are introduced below. 
     A cooling device provided by embodiments of the present disclosure may be applied to any scenario where a to-be-cooled component needs to be cooled, for example, for certain electronic components, such as chips. Because the chips (especially data processing chips with high hash rate) may continue to generate relatively large heat during operation, a corresponding cooling device may need to be equipped to absorb the heat generated by the chips to cool the chips. 
     In embodiments of the present disclosure, the cooling device may cool a hashboard, especially a plurality of data processing chips included in the hashboard. 
     For example, generation of a digital voucher requires a large amount of computation, which requires a processing apparatus of the digital voucher to be equipped with professional processing chips. Chip density of the processing apparatus of the digital voucher is high. The processing chips may generate relatively large heat during operation. Therefore, heat dissipation and cooling may need to be performed immediately. 
     When the digital voucher is related to or embodied as digital currency, the processing apparatus of the digital voucher may include a digital currency mining machine. The digital currency may include encrypted currency such as Bitcoin. 
     In the cooling device of embodiments of the present disclosure, the cooling liquid is contained inside the cooling device. After the cooling liquid is transformed into a gas by absorbing the heat of the to-be-cooled component, the gas may be converted into the liquid by the heat dissipation assembly to realize cooling of the to-be-cooled component. Cooling efficiency may be high. The cooling liquid may be circulated and used. 
     The technical solution shown in the present disclosure is described in detail through embodiments of the present disclosure below. 
     The following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. 
       FIG. 1  is a schematic front view structural diagram of a cooling device according to an embodiment of the present disclosure. As shown in  FIG. 1 , embodiments of the present disclosure provide a cooling device  10 . The cooling device  10  includes a housing  101  and a heat dissipation assembly  102 . A sealed space, which can accommodate cooling liquid, is formed inside the housing  101 . The cooling liquid may contact the to-be-cooled component. The heat dissipation assembly  102  includes a heat dissipation assembly body  1021  and a heat conducting pipe  1022  communicated to the heat dissipation assembly body  1021 . The heat dissipation assembly  1021  is arranged in the sealed space formed by the housing  101 . The heat dissipation assembly body  1021  may be configured to absorb the heat of the gas to covert the gas into the liquid after the cooling liquid transforms into the gas by absorbing the heat of the to-be-cooled component. The heat conducting pipe  1022  may be at least partially located outside the housing  101 . 
     As shown in  FIG. 3 , the heat dissipation assembly body  1021  may be arranged at ½ to ¾ position of the housing  101  along a height direction (a direction indicated by arrow H in  FIG. 3 ). The heat dissipation assembly body  1021  may divide the sealed space formed by the housing  101  into a first space  11 , which may be configured to accommodate the cooling liquid and the to-be-cooled component, and a second space  12 , which may be configured to maintain the pressure. 
     For example, the first space  11  containing the cooling liquid is located at the bottom of the housing. For example, the cooling liquid may be contained in one or more containers. Each container may accommodate one or more to-be-cooled components. Alternatively, the cooling liquid may be placed directly in the first space  11 . 
     In an embodiment of the present disclosure, the bottom of the container may occupy the entire bottom of the housing  101  or only a portion of the bottom of the housing  101 , which is not limited by the present disclosure. 
     In some embodiments, the first space  11  may contain the cooling liquid. The to-be-cooled component may be placed in the cooling liquid. The whole or a portion of the to-be-cooled component may be in contact with the cooling liquid. The cooling liquid may absorb heat from the to-be-cooled component. After the temperature of the cooling liquid reaches a boiling point, the cooling liquid may vaporize into the gas. 
     The heat dissipation assembly body  1021  may not be in contact with the cooling liquid. After the cooling liquid transforms into the gas, the heat dissipation assembly body  1021  may absorb the heat of the gas. The hot gas may liquefy into the liquid when meeting the cold heat dissipation assembly body  1021 . The liquid may flow into the sealed space formed by the housing  101  under the action of gravity so as to realize the circulation of the cooling liquid. While absorbing the heat, the heat dissipation assembly body  1021  may exchange heat with the outside of the housing through the heat conducting pipe  1022  communicating with the heat dissipation assembly body  1021 . Thus, the heat dissipation assembly may absorb heat continuously. 
     In other embodiments of the present disclosure, if the to-be-cooled component is a hashboard, and the hashboard includes a plurality of data processing chips, the cooling liquid may be an insulation liquid. The cooling liquid may not affect the operation of the data processing chips. The data processing chips may be placed in the cooling liquid for cooling during the operation. 
     In other embodiments of the present disclosure, the cooling liquid may include a liquid with a lower boiling point, for example, the boiling point of the cooling liquid may be lower than a certain preset threshold. The cooling liquid with the lower boiling point may be easy to vaporize and absorb the heat faster. The cooling efficiency may be higher. The cooling liquid is, for example, a fluorinated liquid. The preset threshold may include, for example, 70, 62, 60, and 50 Celsius degrees. The suitable cooling liquid may be selected according to the actual situation, which is not limited by the present disclosure. 
     In an embodiment of the present disclosure, as shown in  FIG. 2 , the housing  101  includes a container body  1011  and a cover plate (not shown in the figure). An opening is arranged at the top of the container body  1011 . The cover plate is arranged at the top of the container body  1011 , which is convenient to put the cooling liquid, the heat dissipation assembly  102 , the to-be-cooled component, etc. in the housing  101 . The container body  1011  and the cover plate may be sealed by a seal member, so that a sealed space may be formed inside the housing. In the cooling device, dust may not be accumulated, and no noise may be generated during the cooling process of the to-be-cooled component. 
     The seal member may include, for example, a seal ring made of silicone gel. 
     Exemplarily, the container body  1011  may be cuboid and include a bottom plate  1012  and four side plates  1013  connected to the bottom plate  1012 . 
     The four side plates  1013  may be fixedly connected to each other or detachably connected to each other through a connector, which is not limited by the present disclosure. 
     Based on the technical solution, to facilitate movement of the cooling device  10 , universal wheels may be arranged at the bottom of the container body  1011 . A number of the universal wheels may be four. The universal wheels may be arranged at four corners of the bottom of the container body  1011 . 
     In embodiments of the present disclosure, the housing  101  may include a plurality of structures, which is not limited to the above structure. 
     The heat dissipation assembly body  1021  may be arranged inside the housing  101  through a bracket or fixed on the inner wall of the housing  101 . 
     In the cooling device of embodiments of the present disclosure, the cooling liquid may be accommodated inside the housing of the cooling device. After the cooling liquid transforms into the gas by absorbing the heat of the to-be-cooled component, the gas may be converted into the liquid through the heat dissipation assembly. Thus, the to-be-cooled component may be cooled. The cooling efficiency may be relatively high. The cooling liquid may be circulated and used. 
     Based on embodiments of the present disclosure, the heat dissipation assembly included in the cooling device of the present disclosure is described in detail in connection with  FIG. 3  to  FIG. 6 . 
     In an embodiment of the present disclosure, the heat dissipation assembly body  1021  may include a cooling pipe  1023  and a plurality of heat dissipation fins  1024  arranged at the cooling pipe  1023 . The heat conducting pipe  1022  may communicate with the cooling pipe  1023 . 
     Further, the cooling device  10  may include a third container  103 . The third container  103  may be arranged outside of the housing  101 . The third container  103  may communicate with the heat conducting pipe  1022 . 
     Specifically, the heat-exchange liquid may be accommodated inside the cooling pipe  1023 . The cooling pipe  1023  may communicate with the heat conducting pipe  1022 . The heat conducting pipe  1022  may communicate with the third container  103  outside the housing  101 . Thus, the heat-exchange liquid may circulate in the cooling pipe  102 , the heat conducting pipe  1022 , and the third container  103  to maintain the temperature of the heat-exchange liquid inside the cooling pipe  1022  to be relatively low. Therefore, the heat dissipation assembly body  1021  may absorb the heat continuously from the vaporized gas of the cooling liquid. 
     The third container  103  may be fixed at the outer wall of the housing  101  through a connector. 
     The heat dissipation fin  1024  may be made of copper or aluminum alloy material. The cooling pipe  1023  may be made of copper alloy material. 
     Further, the heat exchange fluid in the third container  103  may be cooled by a radiator outside the cooling device  10 . For example, the radiator may include a fan. 
     The air outlet of the fan may face the third container  103  for cooling the heat exchange fluid in the third container  103 . Thus, the temperature of the heat exchange fluid flowing into the heat conducting pipe  1022  is relatively low. 
     In embodiments of the present disclosure, the heat dissipation assembly body  1021  may be implemented in the following manner. 
     In an embodiment, as shown in  FIG. 4A , the heat dissipation assembly body  1021  further includes a first container  1025  and a second container  1026  arranged opposite to each other. The cooling pipe  1023  includes a plurality of rows of pipes arranged parallelly. An end of the cooling pipe  1023  communicates with the first container  1025 . Another end of the cooling pipe  1023  communicates with the second container  1026 . Thus, the heat-exchange liquid may be circulated in the first container  1025 , the cooling pipe  1023 , and the second container  1026 . 
     Further, the heat dissipation assembly body  1021  may further include two side plates (not shown in the figure), which may be configured to fix the first container  1025 , the second container  1026 , and the cooling pipe  1023  together. The side plates are located on two sides of the cooling pipe  1023 , which are not connected to the first container  1025  and the second container  1026 . 
     As shown in  FIG. 4B , to reduce the volume of the heat dissipation assembly body  1021 , the cooling pipe  1023  may be a flat pipe. The width of the cooling pipe  1023  in the front view  FIG. 4B  is much larger than the width of the cooling pipe  1023  in the top view  FIG. 4A . 
     Specifically, the cooling pipe  1023  may include a plurality of rows of pipes arranged in parallel. The plurality of rows of pipes arranged in parallel may be divided into two portions of pipes. For example, the heat-exchange liquid may flow from the first container  1025  to a portion of pipes and then flow to the second container  1026 . Then, the heat-exchange liquid may flow from the second container  1026  to the other portion of the pipes to flow to the first container  1025 . Thus, the heat-exchange liquid may be circulated in the first container  1025 , the cooling pipe  1023 , and the second container  1026 . 
     In the above specific embodiment, the heat dissipation assembly body  1021  has a relatively large surface area and a relatively small volume. 
     Further, the heat conducting pipe  1022  may include a liquid inlet pipe and a liquid outlet pipe. A liquid inlet  1027  and a liquid outlet  1028  may be arranged at the top of the first container  1025 . The liquid inlet pipe may be connected to the liquid inlet  1027 . The liquid outlet pipe may be connected to the liquid outlet  1028 . 
     Specifically, the heat conducting pipe  1022  may include two portions of pipes, that is, a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe may be configured to transfer the heat-exchange liquid outside of the cooling device  10  into the first container  1025 . The liquid outlet pipe may be configured to transfer the heat-exchange liquid in the first container  1025  into the third container  103  outside of the cooling device  10 . 
     Further, as shown in  FIG. 4A , wave-shaped heat dissipation fins  1024  are arranged in a gap between adjacent cooling pipes  1023 . Specifically, for the plurality of rows of pipes arranged in parallel included in the cooling pipe  1023 , the wave-shaped heat dissipation fins  1024  may be arranged in the gap between any adjacent pipes. 
     In another embodiment, the cooling pipe  1023  may be inserted between the heat dissipation fins  1024  by a Fin insertion process. The cooling pipe  1023  may include an inlet A and an outlet B. The heat conducting pipe  1022  may include a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe may be connected to the inlet A of the cooling pipe  1023 . The liquid outlet pipe may be connected to the outlet B of the cooling pipe  1023 . 
     Specifically, as shown in  FIG. 5 , the heat dissipation assembly body  1021  is realized through the Fin insertion process. The cooling pipe  1023  may be a copper pipe. The cooling pipe  1023  is bent. The cooling pipe  1023  includes an inlet and an outlet. The inlet pipe of the heat conducting pipe  1022  is connected to the inlet. The outlet pipe of the heat conducting pipe  1022  is connected to the outlet to realize the circulation of the heat exchange fluid inside the cooling pipe  1023 . 
     Based on the embodiment, as shown in  FIG. 6 , the cooling device may further include at least one fan  104 . The fan  104  is arranged inside the second space  12  and configured to enhance the flow of the gas. 
     The fan  104  may enhance the flow of the gas and heat exchange to cause the gas obtained after vaporization to be quickly liquefied. 
     The fan  104  may be arranged at the heat dissipation assembly body  1021 . The air outlet of the fan  104  may face the heat dissipation assembly body  1021 . The fan  104  may adjust a rotation speed according to the air pressure in the sealed space. The energy efficiency utilization rate may be high. 
     Further, as shown in  FIG. 7 ,  FIG. 7  is a top view of the cooling device  10 . A wire hole  105  is arranged at the housing  101  and configured to arrange the power cord through. The power cord may be configured to provide power to the to-be-cooled component and the fan  104 . The wire hole  105  may be sealed through a seal material. The seal material may include, for example, rubber. 
     An opening  106  may be arranged at the housing  101  and configured to arrange the heat conducting pipe  1022  through. The opening  106  may be sealed through a seal material. 
     In some other embodiments of the present disclosure, a switch valve may be arranged at the heat conducting pipe  1022  outside of the cooling device  10  and configured to control the flow of the heat-exchange liquid. 
     In some embodiments, the cooling device may accommodate the cooling liquid and the heat dissipation assembly through the housing. The heat dissipation assembly may realize the circulation of the heat-exchange liquid through the heat dissipation assembly body and the heat conducting pipe to dissipate heat. The structure may be simple. After the cooling liquid transforms into the gas by absorbing the heat of the to-be-cooled component, the heat dissipation assembly may convert the gas into the liquid to cool the to-be-cooled component. The cooling efficiency may be high. The cooling liquid may be circulated and used. 
     Embodiments of the present disclosure may further provide a data processing apparatus including a power source and the cooling device of any one of the embodiments. 
     The data processing apparatus of embodiments of the present disclosure may have a similar principle and technical effects to the cooling device embodiments, which is not repeated here. 
     When used in the present disclosure, although the terms “first,” “second,” etc., may be used in the present disclosure to describe various elements. These elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without changing the meaning of the description, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, as long as all occurrences of the “first element” are renamed consistently and all occurrences “second element” are renamed consistently. The first element and the second element may be both elements but may not be the same element. 
     The terms used in the present disclosure are only used to describe embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly otherwise specified, the singular forms “a,” “an,” and “the” are intended to also include plural forms. Similarly, the term “and/or” as used in the present disclosure may refer to any and all possible combinations, including one or more of the associated lists. In addition, when used in the present disclosure, the term “comprise” and its variants “comprises” and/or “comprising” may refer to the existence of the stated features, wholes, steps, operations, elements, and/or assemblies, but do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, assemblies, and/or groups of these features, wholes, steps, operations, elements, and assemblies. 
     The various aspects, implementation manners, implementations, or features in the described embodiments may be used alone or in any combination. 
     The above technical description may refer to the accompanying drawings, which form a portion of the present disclosure, and through the description, the accompanying drawings show implementations in accordance with the described embodiments. Although these embodiments are described in sufficient detail to enable those skilled in the art to implement these embodiments, these embodiments are non-limiting. As such, other embodiments may be used without departing from the scope of the described embodiments, and changes may also be made to the embodiments. For example, the sequence of operations described in the flowchart is non-limiting. Thus, the sequence of two or more operations explained in the flowchart and described according to the flowchart may be changed according to several embodiments. As another example, in several embodiments, one or more operations illustrated in the flowchart and described according to the flowchart are optional or may be deleted. In addition, certain steps or functions may be added to the disclosed embodiments, or the sequence of two or more steps may be replaced. All these changes may be considered to be included in the disclosed embodiments and claims. 
     In addition, the terminology is used in the above technical description to provide a thorough understanding of the described embodiments. However, too many details may not be required to implement the described embodiments. Therefore, the above description of the embodiments may be presented for explanation and description. The embodiments presented in the above description and the examples disclosed according to these embodiments are provided separately to add context and help understand the described embodiments. The above description is not intended to be exhaustive or to limit the described embodiments to the precise form of the present disclosure. Based on the above teachings, several modifications, options, and changes may be feasible. In some cases, well-known processing steps may not be described in detail to avoid unnecessarily affecting the described embodiments.