Abstract: A power supply includes a connector, a power conversion controller to generate a power supply signal at the connector, and a communication and control processor. The communication and control processor is to receive a set of current control parameters including a current limit over a communication link in the connector, receive measurements of current and voltage of the power supply signal, and generate a drive signal for controlling the power conversion controller based on the received current control parameters and the measurements of the current and the voltage.

Abstract: A direct current (DC) power source includes a rechargeable battery and a battery charging circuit, and supplies an output voltage within a specified output voltage range to at least one output port. In one embodiment, the power source determines whether an input voltage is present at an input port, where the input voltage is usable to produce a battery charging voltage during normal operation of the charging circuit. The power source also determines whether at least one load device is coupled to the output port(s). When the input voltage is present at the input port and at least one load device is coupled to the output port(s), the power source electronically decouples the rechargeable battery from the charging circuit, electronically adjusts a voltage at an output of the charging circuit so as to be within the specified output voltage range, and provides the adjusted voltage to the output port(s).

Abstract: An electronic device having an auto-on circuit is provided. The electronic device can include a charging circuit and a control circuit. The control circuit can cause the charging circuit to deliver energy to an external device. The auto-on circuit, which can include an active circuit, can activate the control circuit in response to one or more trigger input circuits. Each trigger input circuit can actuate a switch and deliver an auto-on signal to the control circuit. The control circuit can then actuate a latch to deliver power to a power input terminal to keep itself powered ON.

Abstract: A method and apparatus operate a switchmode power supply. The apparatus can include a pulse width modulation controller that can produce a first pulse width modulation signal at a first frequency. The apparatus can include a switchmode power supply switching element including a control terminal. The apparatus can include a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element. The harmonic filter can provide a second pulse width modulation signal at a second frequency to the control terminal of the switching element. The second frequency can be higher than the first frequency.

Abstract: A power supply includes a connector, a power conversion controller to generate a power supply signal at the connector, and a communication and control processor. The communication and control processor is to receive a set of current control parameters including a current limit over a communication link in the connector, receive measurements of current and voltage of the power supply signal, and generate a drive signal for controlling the power conversion controller based on the received current control parameters and the measurements of the current and the voltage.

Abstract: A method and apparatus charge devices using a multiple port power supply. The apparatus can include a power supply. The apparatus can include a first device charging port coupled to the power supply. The first device charging port can receive power from the power supply and output power to a first device. The apparatus can include a second device charging port coupled to the power supply. The second device charging port can receive power from the power supply and output power to a second device. The apparatus can include a device charging port monitor coupled to the first device charging port and coupled to the second device charging port. The device charging port monitor can detect a number of device charging ports in use. The apparatus can include a cable compensator coupled to the device charging port monitor. The cable compensator can select a first cable compensation if one device charging port is in use and can select a second cable compensation if two device charging ports are in use.

Abstract: A method and apparatus operate a switchmode power supply. The apparatus can include a pulse width modulation controller that can produce a first pulse width modulation signal at a first frequency. The apparatus can include a switchmode power supply switching element including a control terminal. The apparatus can include a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element. The harmonic filter can provide a second pulse width modulation signal at a second frequency to the control terminal of the switching element. The second frequency can be higher than the first frequency.

Abstract: A direct current (DC) power source includes a rechargeable battery and a battery charging circuit, and supplies an output voltage within a specified output voltage range to at least one output port. In one embodiment, the power source determines whether an input voltage is present at an input port, where the input voltage is usable to produce a battery charging voltage during normal operation of the charging circuit. The power source also determines whether at least one load device is coupled to the output port(s). When the input voltage is present at the input port and at least one load device is coupled to the output port(s), the power source electronically decouples the rechargeable battery from the charging circuit, electronically adjusts a voltage at an output of the charging circuit so as to be within the specified output voltage range, and provides the adjusted voltage to the output port(s).

Abstract: An electronic device having an auto-on circuit is provided. The electronic device can include a power supply or charging circuit and a control circuit. The control circuit can cause the power supply or charging circuit to deliver energy to an external device. The auto-on circuit can activate the control circuit in response to one or more trigger input circuits. Each trigger input circuit can actuate a switch and deliver an auto-on signal to the control circuit. The control circuit can then actuate a latch to deliver power to a power input terminal to keep itself powered ON.

Abstract: An electronic device having an auto-on circuit is provided. The electronic device can include a charging circuit and a control circuit. The control circuit can cause the charging circuit to deliver energy to an external device. The auto-on circuit, which can include an active circuit, can activate the control circuit in response to one or more trigger input circuits. Each trigger input circuit can actuate a switch and deliver an auto-on signal to the control circuit. The control circuit can then actuate a latch to deliver power to a power input terminal to keep itself powered ON.

Abstract: A method and apparatus charge devices using a multiple port power supply. The apparatus can include a power supply. The apparatus can include a first device charging port coupled to the power supply. The first device charging port can receive power from the power supply and output power to a first device. The apparatus can include a second device charging port coupled to the power supply. The second device charging port can receive power from the power supply and output power to a second device. The apparatus can include a device charging port monitor coupled to the first device charging port and coupled to the second device charging port. The device charging port monitor can detect a number of device charging ports in use. The apparatus can include a cable compensator coupled to the device charging port monitor. The cable compensator can select a first cable compensation if one device charging port is in use and can select a second cable compensation if two device charging ports are in use.

Abstract: A method and system for determining a camera-to-display latency of an electronic device (100) having a camera (134) and touch-sensitive display (108) are disclosed. In one example embodiment, the method (500) includes receiving (511) first light (136) at the camera, and essentially simultaneously receiving second light (138) at a first photosensitive structural portion (102, 602). The method (500) further includes detecting (512) a first simulated touch input at the display (108) in response to a first actuation of the first photosensitive structural portion (102, 602), receiving third light (140) at a second photosensitive structural portion (104, 604), the third light being generated based at least indirectly upon the received first light (136), detecting (514) a second simulated touch input at the display (108) as a result of the receiving of the third light (140), and determining the camera-to-display latency based at least indirectly upon the touch inputs (516).

Abstract: A method and system for determining a camera-to-display latency of an electronic device (100) having a camera (134) and touch-sensitive display (108) are disclosed. In one example embodiment, the method (500) includes receiving (511) first light (136) at the camera, and essentially simultaneously receiving second light (138) at a first photosensitive structural portion (102, 602). The method (500) further includes detecting (512) a first simulated touch input at the display (108) in response to a first actuation of the first photosensitive structural portion (102, 602), receiving third light (140) at a second photosensitive structural portion (104, 604), the third light being generated based at least indirectly upon the received first light (136), detecting (514) a second simulated touch input at the display (108) as a result of the receiving of the third light (140), and determining the camera-to-display latency based at least indirectly upon the touch inputs (516).

Abstract: This invention is directed to nanofibers doped with an alkali salt having improved tensile properties, and process of preparation thereof.

Abstract: A circuit (800) for controlling at least one piezoelectric actuator (142) includes a piezoelectric drive circuit (802) that generates unidirectional voltage drive signal, also referred to as Vout, at node (804). The piezoelectric actuator drive circuit (802) includes a boost switcher circuit or charging circuit (806), a buck switcher circuit or pulsed current sink discharge circuit (808) and a control signal generating circuit (810) that receives an input control signal (812) from, for example, a keyboard processor or other suitable processor (604) indicating that the device has requested generation of haptic feedback utilizing the piezoelectric actuator (142). The control signal generating circuit (810) provides at least two pulse-with-modulated control signals, one to control the charging circuit and one to control the discharging circuit to produce the unidirectional voltage drive signal, that in one example is a raised cosine drive signal (904).

Abstract: A circuit (800) for controlling at least one piezoelectric actuator (142) includes a piezoelectric drive circuit (802) that generates unidirectional voltage drive signal, also referred to as Vout, at node (804). The piezoelectric actuator drive circuit (802) includes a boost switcher circuit or charging circuit (806), a buck switcher circuit or pulsed current sink discharge circuit (808) and a control signal generating circuit (810) that receives an input control signal (812) from, for example, a keyboard processor or other suitable processor (604) indicating that the device has requested generation of haptic feedback utilizing the piezoelectric actuator (142). The control signal generating circuit (810) provides at least two pulse-with-modulated control signals, one to control the charging circuit and one to control the discharging circuit to produce the unidirectional voltage drive signal, that in one example is a raised cosine drive signal (904).