Abstract: A clearance control assembly for a gas turbine engine that defines an axial direction and a radial direction and includes a stage of rotor blades and a shroud hanger. The assembly includes a case configured to be positioned outward along the radial direction from the stage of rotor blades when installed in the gas turbine engine. The case is further configured to be engaged with the shroud hanger at a first location when installed in the gas turbine engine. The assembly also includes a baffle positioned outward along the radial direction from the case to define a chamber therebetween. The baffle has a forward end and an aft end. The forward end of the baffle is engaged with the case to form a first seal and the aft end of the baffle is engaged with the case to form a second seal. The baffle, the case, or both define an inlet to allow a fluid to enter the chamber and the case defines an outlet to allow the fluid to exit the chamber.

Abstract: The present disclosure describes a system with a voltage regulator, a comparator circuit, and a control circuit. The voltage regulator includes an output node and is configured to generate a voltage at the output node. The comparator circuit is configured to compare the voltage at the output node to a reference voltage. The control circuit is configured to disable the voltage regulator after the voltage regulator has generated a charge cycle and for a period of time until the voltage at the output node is below the reference voltage.

Abstract: The present disclosure describes a system with a voltage regulator, a current source circuit, and a control circuit. The voltage regulator has an output node and is configured to provide a supply voltage at the output node. The current source circuit is configured to draw current away from the voltage regulator's output node. And, the control circuit is configured to delay enabling the current source circuit in response to a voltage at the voltage regulator's output node being above a predetermined voltage level and the voltage regulator being disabled. With this arrangement, a voltage ripple at the voltage regulator's output node can be reduced in the presence of a bi-polar load current, which can be advantageous in voltage regulator designs (e.g., in DC-DC converters employing a Pulse Frequency Modulation scheme).

Abstract: An oral dental appliance is provided that adjusts the position of a user's lower jaw relative to the upper jaw to avoid one cause of sleep apnea. The appliance includes an upper tray and a lower tray, each tray substantially identically configured and each tray defining a generally U-shaped channel to receive a bite guard molded to match the respective upper and lower dental arch of a user. The appliance further includes an adjustable clip assembly that is removably engageable to the upper and lower trays. The clip assembly is configured to be fixed in an adjustable forward (vestibular)-rearward (lingual) position relative to each other prior to engagement with the upper tray and the lower tray. The clip assembly is engageable to the trays so that the trays cannot move relative to the clips or relative to each other in the forward-rearward direction.

Abstract: A pulse generator circuit in a DC-to-DC converter may be configured to generate pulses that have a frequency that increases in response to increases in the load on the DC-to-DC converter. The pulse generator circuit may be configured to cause each pulse to have a constant width. When the pulse reaches the end of the constant width and the magnitude of the current through an inductance in the converter is less than a threshold value, however, the pulse generator may be configured to extend the pulse until the magnitude of the current through the inductance reaches the threshold value. The pulse generator circuit may be configured to prematurely terminate each pulse if and at such time as the load voltage exceeds a target value by approximately half of the peak-to-peak voltage of the ripple component plus the noise component margin.

Abstract: A system that integrates navigational device (e.g., mouse) functionality into a cellular telephone or other handheld device (e.g., personal organizer, personal media player). A device can employ existing optics from an image capture device (e.g., camera) as the optics for the mouse. A mouse engine can receive an input from the optics and route the input via a Bluetooth™, or other existing connection (e.g., wired or wireless) to transfer the mouse coordinates to a desktop. In another example, a device can employ a touch sensitive pad to supply motion input to a mouse engine. Further, a device (e.g., personal organizer, pocket personal computer) can utilize an existing touch screen as a touch sensitive input to a mouse engine. A laser pointer can be integrated into a device thereby enabling presenters to use the device to point to slides and other target visuals.

Abstract: A pulse generator circuit in a DC-to-DC converter may be configured to generate pulses that have a frequency that increases in response to increases in the load on the DC-to-DC converter. The pulse generator circuit may be configured to cause each pulse to have a constant width. When the pulse reaches the end of the constant width and the magnitude of the current through an inductance in the converter is less than a threshold value, however, the pulse generator may be configured to extend the pulse until the magnitude of the current through the inductance reaches the threshold value. The pulse generator circuit may be configured to prematurely terminate each pulse if and at such time as the load voltage exceeds a target value by approximately half of the peak-to-peak voltage of the ripple component plus the noise component margin.

Abstract: To prevent a voltage glitch in the regulated DC output voltage of a PWM/PFM DC-DC converter when switching between PFM and PMW modes, the error amplifier of the converter's PWM regulation path is provided with a DC voltage offset correction mechanism. This mechanism “zeros-out” DC voltage offsets that may be present in the voltage regulation path, thereby enabling the error amplifier to accurately regulate the converter's output voltage. When the converter transitions between PFM and PWM modes, the DC offset correction mechanism establishes initial conditions of the error amplifier that effectively ensure that the converter's regulated output voltage at the beginning of a new “switched-to” PWM mode cycle is DC offset-free.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A filler neck closure assembly is provided for a fuel tank filler neck. The closure assembly is configured to receive a fuel-dispensing pump nozzle and to regulate discharge of liquid fuel and fuel vapor from a fuel tank filler neck to the surroundings.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly between a pivotable outer door and a pivotable inner door to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A plurality of constant ON-time buck converters are coupled to a common load. The output of each buck converter is coupled to a common load via a series sense resistor. The regulated output voltage across the common load is compared to a reference voltage to generate a start signal. The start signal is alternately coupled to the controller on each buck converter. The ON-time of a master buck converter is terminated when a ramp signal generated from the regulator input voltage exceeds the reference voltage. All other slave converters have an ON-time pulse started by the start signal and stopped by comparing a sense voltage corresponding to their output current during their ON-time pulse to the peak current in the master converter during its ON-time. A counting circuit with an output corresponding to each of the plurality of buck converters is used to select which buck converter receives the start signal.

Abstract: A nozzle inhibitor is positioned in a filler neck closure assembly to prevent a user from pumping unleaded fuel into a diesel fuel tank. The nozzle inhibitor blocks full insertion of a small-diameter unleaded fuel nozzle into the filler neck closure assembly yet allows full insertion of a large-diameter diesel fuel nozzle into the filler neck closure assembly.

Abstract: A constant ON-time controller for a buck converter utilizes dual symmetrical ramps. The ramps may be generated artificially or by sensing the voltage across a sense resistor in the output. The ramp may also be generated by sensing the voltage across the “ON” resistance of the low side FET in the switching regulator. A modified output voltage has one of the ramps superimposed and a modified reference voltage has the other ramps superimposed. The modified output voltage and the modified reference voltage are compared to determine when to start the ON-time of the buck converter. The dual ramps reduce, noise susceptibility. The ON-time is stopped in response to charging a capacitor with the regulator input voltage. An offset may also be generated representing the difference between the average output voltage and the reference voltage. The offset is used to generate a modified reference to compensate for the offset.

Abstract: A vent apparatus includes a venting outlet and a tank mount adapted to support the venting outlet in communication with a mounting aperture formed in a fuel tank. The tank mount is made of a weldable plastics material.

Abstract: An evaporative emissions control fuel cap system comprises a closure adapted to mate with a fuel tank. The closure includes a passageway formed therein to conduct vapors from the fuel tank to the atmosphere. The closure includes a filter configured to capture hydrocarbons positioned in the passageway so that fuel vapor flowing from the fuel tank is scrubbed of hydrocarbons before being discharged to the atmosphere.

Abstract: A compensated reference voltage for the controller of a buck regulator corrects for offsets and controls the rate at which the output load current can change in response to a change in the reference setting output voltage level of the buck converter. A current source is coupled to a resistor that has one terminal connected to the ground potential of the output voltage. The voltage across this resistor generates a remote reference voltage. A feedback current is generated as a function of the difference between the remote reference voltage and the output voltage. The feedback current is time integrated to form the compensated reference, which is used to control the ON-time of the buck converter.

Abstract: A fuel tank vent system includes a fuel vapor vent apparatus and a vent controller. The fuel vapor vent apparatus is adapted to be coupled to a fuel tank. The vent controller is coupled to the fuel vapor vent apparatus and configured to control flow of fuel vapor from the fuel tank through the fuel vapor vent apparatus to a destination outside the fuel tank.

Abstract: A system and method provides virtual ripple signal generation for use in voltage regulation applications. Some switch-mode power converters or voltage regulators use output signal ripple to effect voltage regulation. A virtual ripple generator provides this type of voltage regulator with a virtual ripple signal comprising an offset component responsive to actual load voltage, but with a generated AC ripple component of arbitrary magnitude that is independent of actual output signal ripple. Unlike the actual output ripple signal, the generated AC ripple component is not dependent on implementation specifics, such as circuit board layout or output capacitor ESR, and may have its gain set independent of the offset component. The generated AC ripple component is synchronized to the inductor switching actions of the voltage regulator and thus reflects actual inductor phase switching in single and multi-phase regulation applications.

Abstract: To prevent a voltage glitch in the regulated DC output voltage of a PWM/PFM DC-DC converter when switching between PFM and PMW modes, the error amplifier of the converter's PWM regulation path is provided with a DC voltage offset correction mechanism. This mechanism “zeros-out” DC voltage offsets that may be present in the voltage regulation path, thereby enabling the error amplifier to accurately regulate the converter's output voltage. When the converter transitions between PFM and PWM modes, the DC offset correction mechanism establishes initial conditions of the error amplifier that effectively ensure that the converter's regulated output voltage at the beginning of a new “switched-to” PWM mode cycle is DC offset-free.