1. Field of Art
The disclosure generally relates to the field of universal serial bus (USB) chargers, and specifically to providing multiple charging voltages for faster charging.
2. Description of the Related Art
Universal serial bus (USB) is a connection standard used that can be used to interconnect multiple computing devices (e.g., a personal computer, a smartphone) and peripherals (e.g., a mouse, a keyboard, a camera) to each other. In addition to being able to connect computing devices and peripherals, a USB connector can also be used to deliver power. For instance, a USB connector may be used to provide power to charging the battery of mobile devices. Power can be provided from a host computing device or by a dedicated power supply (e.g., a charger).
When charging the battery of a mobile device, the charging speed is limited by the voltage and current provided through the USB connector. Current USB chargers only output a voltage of 5V, as specified by the USB standard, when delivering power to a mobile device. This greatly limits the speed of charging the mobile device.
Thus, it would be advantageous to be able to deliver an output voltage at a higher voltage level, in addition to the voltage specified by the USB standard, upon request from the mobile device for increasing the charging speed of the mobile device.
A universal serial bus (USB) charger provides power to a client device. A USB connector interfaces with a client device and receives a request for the output voltage of the USB charger to be at a specific value. If the requested voltage level is lower than the current output voltage level, the output voltage level is set to the requested level and a bleeder circuit is enabled to discharge the output capacitor of the USB charger.
The features and advantages described in the specification are not all inclusive and, in particular, many additional features and advantages will be apparent to one of ordinary skill in the art in view of the drawings and specification. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter.
The disclosed embodiments have other advantages and features which will be more readily apparent from the detailed description, the appended claims, and the accompanying figures (or drawings). A brief introduction of the figures is below.
The figures (FIGS.) and the following description relate to preferred embodiments by way of illustration only. It should be noted that from the following discussion, alternative embodiments of the structures and methods disclosed herein will be readily recognized as viable alternatives that may be employed without departing from the principles of what is claimed.
Reference will now be made in detail to several embodiments, examples of which are illustrated in the accompanying figures. It is noted that wherever practicable similar or like reference numbers may be used in the figures and may indicate similar or like functionality. The figures depict embodiments of the disclosed system (or method) for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles described herein.
Universal Serial Bus (USB) Charger
In some embodiments, first terminal 111 and fourth terminal 117 are used for transferring power and second terminal 113 and third terminal 115 are used for transferring data. For instance, first terminal 111 may be used for transferring a supply voltage (e.g. Vdd) and fourth terminal 117 may be used for transferring a ground reference voltage (GND). Additionally, second terminal 113 may be used for transferring a differential data signal at plus or positive side and the third terminal 115 may be used for transferring a differential signal at minus or negative side.
In some embodiments, other types of USB connectors may be used instead of the one illustrated in
In one embodiment, if no client device is connected to the USB charger 200, the USB charger outputs the lower voltage level (e.g., 5V). When a device is disconnected from the USB charger 200, and the output voltage level of the USB charger is not at the lower level when the client device is disconnected, the USB charger 200 lowers the output voltage to the lower voltage level.
USB charger 200 includes a USB connector 100, a bleeder circuit 203, an output voltage controller 205, and a charger controller 207. USB connector 100 allows the client device to receive power from the USB charger 200.
The output voltage controller 205 receives a signal from the client device 201 indicating which output voltage level the client device 201 can accept and sends a signal to the controller 207 to generate the desired output voltage. In some embodiments, the output voltage controller 205 senses the output voltage level of the USB charger 200 and determines an error value between the voltage level requested by the client device and the output voltage level of the USB charger 200. This error value may be provided to the controller 207 to produce the desired output voltage Vout. If the client device 201 requests an output voltage Vout lower than the voltage level currently being outputted by the USB charge 200, the output voltage controller 205 may turn on and off bleeder 203 to decrease the output voltage level to the value requested by the client device 201. In some embodiments, the current voltage controller 205 senses the output voltage Vout and turns off the bleeder 203 when the output voltage reaches the value requested by the client device 201.
Bleeder 203 creates a discharging path for output capacitor (Cout) to discharge. When the client device 201 requests for an output voltage level, lower than the current voltage level being outputted by the USB charger 200, the bleeder 203 is turned on by the output voltage controller 205 and the charge stored in the output capacitor Cout is discharged, thus lowering the voltage of the output of the USB charger 200. Different embodiments of the bleeder 203 are illustrated in
Controller 207 receives a V_OUT SETTING signal from the output voltage controller 205 and turns on and off transistor T1 accordingly. In some embodiments, the V_OUT SETTING signal is an error value between the output voltage level of the USB charger 200 and the voltage level requested by the client device 201. In other embodiments, the V_OUT SETTING signal may be a signal indicating which output voltage level to generate. For instance, the V_OUT SETTING may be a digital signal indicating that the client device requested a first voltage level (e.g. 5V) or a second voltage level (e.g. 12V). While in the specific embodiment of
where V0 is the value of the output voltage Vout when switch S1 is turned on. Therefore, the amount of time to reduce the output voltage from Vdd1 to Vdd2 is given by
After the output voltage reaches the desired voltage level, the output voltage controller may turn off switch S1 to prevent further discharge of Cout through R1.
The bleeder circuit of
Furthermore, the amount of time to transfer the charge from Cout to C1 may depend on a value of the parasitic resistance of Cout and/or C1.
Additionally, the charge stored in Cout and the charge stored in C1 is discharged through R1. As a result, the output voltage of the USB charger 200 is given by
where V1 is the output voltage level after the charge has been transferred from Cout to C1. Therefore, the amount of time to reduce the output voltage from V1 to Vdd2 is given by
The bleeder circuit of
The bleeder circuit of
The bleeder circuit of
In the bleeder circuits of
While the switches in the bleeder circuits 203 of
If the client device 201 requested an output voltage at a lower level, or a client device 201 is not connected to the USB charger 200, a determination is made whether the output voltage is at a higher voltage level. If the output voltage is at a higher level, the bleeder 203 is enabled 520 and the controller 207 is set 530 to generate an output voltage Vout at the lower voltage level Vdd1.
Additional Configuration Considerations
Throughout this specification, plural instances may implement components, operations, or structures described as a single instance. Although individual operations of one or more methods are illustrated and described as separate operations, one or more of the individual operations may be performed concurrently, and nothing requires that the operations be performed in the order illustrated. Structures and functionality presented as separate components in example configurations may be implemented as a combined structure or component. Similarly, structures and functionality presented as a single component may be implemented as separate components. These and other variations, modifications, additions, and improvements fall within the scope of the subject matter herein.
Certain embodiments are described herein as including logic or a number of components, modules, or mechanisms. Modules may constitute either software modules (e.g., code embodied on a machine-readable medium or in a transmission signal) or hardware modules. A hardware module is tangible unit capable of performing certain operations and may be configured or arranged in a certain manner. In example embodiments, one or more computer systems (e.g., a standalone, client or server computer system) or one or more hardware modules of a computer system (e.g., a processor or a group of processors) may be configured by software (e.g., an application or application portion) as a hardware module that operates to perform certain operations as described herein.
In various embodiments, a hardware module may be implemented mechanically or electronically. For example, a hardware module may comprise dedicated circuitry or logic that is permanently configured (e.g., as a special-purpose processor, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC)) to perform certain operations. A hardware module may also comprise programmable logic or circuitry (e.g., as encompassed within a general-purpose processor or other programmable processor) that is temporarily configured by software to perform certain operations. It will be appreciated that the decision to implement a hardware module mechanically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations.
The various operations of example methods described herein may be performed, at least partially, by one or more processors that are temporarily configured (e.g., by software) or permanently configured to perform the relevant operations. Whether temporarily or permanently configured, such processors may constitute processor-implemented modules that operate to perform one or more operations or functions. The modules referred to herein may, in some example embodiments, comprise processor-implemented modules.
The one or more processors may also operate to support performance of the relevant operations in a “cloud computing” environment or as a “software as a service” (SaaS). For example, at least some of the operations may be performed by a group of computers (as examples of machines including processors), these operations being accessible via a network (e.g., the Internet) and via one or more appropriate interfaces (e.g., application program interfaces (APIs).)
The performance of certain of the operations may be distributed among the one or more processors, not only residing within a single machine, but deployed across a number of machines. In some example embodiments, the one or more processors or processor-implemented modules may be located in a single geographic location (e.g., within a home environment, an office environment, or a server farm). In other example embodiments, the one or more processors or processor-implemented modules may be distributed across a number of geographic locations.
Some portions of this specification are presented in terms of algorithms or symbolic representations of operations on data stored as bits or binary digital signals within a machine memory (e.g., a computer memory). These algorithms or symbolic representations are examples of techniques used by those of ordinary skill in the data processing arts to convey the substance of their work to others skilled in the art. As used herein, an “algorithm” is a self-consistent sequence of operations or similar processing leading to a desired result. In this context, algorithms and operations involve physical manipulation of physical quantities. Typically, but not necessarily, such quantities may take the form of electrical, magnetic, or optical signals capable of being stored, accessed, transferred, combined, compared, or otherwise manipulated by a machine. It is convenient at times, principally for reasons of common usage, to refer to such signals using words such as “data,” “content,” “bits,” “values,” “elements,” “symbols,” “characters,” “terms,” “numbers,” “numerals,” or the like. These words, however, are merely convenient labels and are to be associated with appropriate physical quantities.
Unless specifically stated otherwise, discussions herein using words such as “processing,” “computing,” “calculating,” “determining,” “presenting,” “displaying,” or the like may refer to actions or processes of a machine (e.g., a computer) that manipulates or transforms data represented as physical (e.g., electronic, magnetic, or optical) quantities within one or more memories (e.g., volatile memory, non-volatile memory, or a combination thereof), registers, or other machine components that receive, store, transmit, or display information.
As used herein any reference to “one embodiment” or “an embodiment” means that a particular element, feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.
Some embodiments may be described using the expression “coupled” and “connected” along with their derivatives. For example, some embodiments may be described using the term “coupled” to indicate that two or more elements are in direct physical or electrical contact. The term “coupled,” however, may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments are not limited in this context.
As used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, unless expressly stated to the contrary, “or” refers to an inclusive or and not to an exclusive or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).
In addition, use of the “a” or “an” are employed to describe elements and components of the embodiments herein. This is done merely for convenience and to give a general sense of the invention. This description should be read to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise.
Upon reading this disclosure, those of skill in the art will appreciate still additional alternative structural and functional designs for a system and a process for providing a USB power supply voltage at multiple voltage levels through the disclosed principles herein. Thus, while particular embodiments and applications have been illustrated and described, it is to be understood that the disclosed embodiments are not limited to the precise construction and components disclosed herein. Various modifications, changes and variations, which will be apparent to those skilled in the art, may be made in the arrangement, operation and details of the method and apparatus disclosed herein without departing from the spirit and scope defined in the appended claims.
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