Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.

Abstract: A synchronous rectifier control circuit includes a drain voltage input, a gate voltage output, a gate voltage generation circuit, a burst detection circuit, an on-time monitor circuit, and a burst mode reset circuit. The gate voltage generation circuit includes a first input coupled to the drain voltage input, and an output coupled to the gate voltage output. The burst detection circuit includes a first input coupled to the drain voltage input, and an output coupled to a second input of the gate voltage generation circuit. The on-time monitor circuit includes an input coupled to the output of the gate voltage generation circuit. The burst mode reset circuit includes a first input coupled to the drain voltage input, a second input coupled to an output of the on-time monitor circuit, and an output coupled to a second input of the burst detection circuit.

Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.

Abstract: A synchronous rectifier controller integrated circuit. The synchronous rectifier controller integrated circuit comprises a continuous current mode (CCM) detection circuit configured to detect CCM operation based on sensing a voltage at a pre-defined point in a rectification cycle; a multiplexer having a first reference voltage signal input, a second reference voltage signal input, an output, and a selector input coupled to the CCM detection circuit; and a gate voltage driver circuit coupled to the output of the multiplexer.

Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.

Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.

Abstract: A probiotics and prebiotics compound preparation and a processing method thereof are provided. The processing method includes the following processing steps: (1) before production, disinfecting hands of personnel, equipment and tools with alcohol at the concentration of 72 percent; (2) respectively drying stachyose, fructo-oligosaccharide, galactooligosaccharide, isomaltooligosaccharide, lactobacillus rhamnosus HN001 and bifidobacterium lactis; (3) mixing 25 to 35 parts of the stachyose, 15 to 25 parts of the fructo-oligosaccharide, 35 to 45 parts of the galactooligosaccharide, 5 to 15 parts of the isomaltooligosaccharide and 0.05 to 0.1 part of caffeine; (4) pasteurizing the mixed saccharide; and (5) respectively adding the lactobacillus rhamnosus HN001 and the bifidobacterium lactis Bi-07 into the mixed saccharide according to a ratio of 3×108 CFU/g. The compound preparation prepared by adopting the method may effectively complete intestinal floras, thereby relieving a burden of allergic dermatitis.

Abstract: An electric tool includes a functional piece, a motor, a case and a fan. The case includes a motor case portion. An airflow inlet and an airflow outlet are formed in the case. When the fan operates, an airflow at the airflow inlet is taken out and is directed to the airflow outlet after the airflow flows through the motor. The motor case portion includes an encircling portion which encircles the motor and an end portion arranged on one end of the encircling portion. The motor includes a stator, a motor shaft and a rotor. The stator is fixed relative to the case. The motor shaft is rotatably arranged in the case. The rotor surrounds the stator and rotates synchronously with the motor shaft. A stopping piece having a stopping portion is arranged at a first clearance between the rotor and the encircling portion. A projection of the stopping piece in a plane perpendicular to a rotating axis of the rotor is at least partially located outside a projection of the rotor in the plane.

Abstract: A polymer composition that contains a polyaryletherketone and thermotropic liquid crystalline polymer, which are melt processed in the presence of a flow modifier. The flow modifier is a functional compound that contains one or more hydroxyl functional groups.

Abstract: An electronic device includes a power stage, a switch and a controller. Power is transferred from an input through the power stage to an output. The switch turns on and off a current provided to the power stage for transferring the power. The controller turns on and off the switch. During a low-load mode, the controller causes the switch to operate with a constant on-time control.

Abstract: A polymer composition that contains a polyaryletherketone and a plurality of reinforcing fibers is provided. The reinforcing fibers have an aspect ratio of from about 1.5 to about 10, which is defined as the cross-sectional width of the fibers divided by the cross-sectional thickness of the fibers.

Abstract: The present disclosure provides a mask plate, belongs to the field of display technology, and can maintain a uniform exposing interval, so that the exposure pattern has a uniform deformation amount and pattern size. A mask plate comprises opaque regions and transparent regions, and spacers of the same height are arranged in the opaque regions. Another mask plate comprises active regions and dummy regions, and spacers of the same height are arranged in the dummy regions. The present disclosure can be applied in a process for fabricating a color film substrate.

Abstract: A polymer composition that contains a polyaryletherketone and thermotropic liquid crystalline polymer, which are melt processed in the presence of a flow modifier. The flow modifier is a functional compound that contains one or more hydroxyl functional groups.

Abstract: On the secondary side of a flyback switching power converter, a compensation diode and a voltage divider with an averaging circuit generate an output current-compensated reference voltage that is proportional to converter output current. The current-compensated reference voltage is added to a regulation feedback controller reference voltage, which in turn adjusts the negative feedback signal to the PWM regulation controller on the primary side in proportion to the converter output current draw. The net effect is to increase the converter output voltage set-point in proportion to the converter output current draw as compensation for a voltage drop in a cable connecting the converter to a powered device. More precisely-regulated voltage levels may be delivered to an input of the powered device as a result.

Abstract: Polymer compositions are described that are well suited for producing reflectors for light-emitting devices, such as light-emitting diodes. In one particular embodiment, the polymer composition contains a polymer resin, a white pigment, a silicone compound, and a nucleating agent. The polymer resin may comprise, for instance, a poly(1,4-cyclohexanedimethanol terephthalate). In accordance with the present disclosure, the composition also contains at least one silicone compound and at least one nucleating agent. The silicone compound and nucleating agent have been found to improve the molding processability and reflectance stability of the polymer composition.

Abstract: Polymer compositions are described containing a poly(1,4-cyclohexanedimethanol terephthalate) polymer in combination with a white pigment and optionally one or more reinforcing fillers. In accordance with the present disclosure, the composition also contains one or more reactive viscosity stabilizers. In order to prevent against yellowing, the composition is free of various aromatic epoxy resins, such as novolac epoxy resins. The polymer composition has excellent reflectance properties making the composition well suited for producing reflectors for light sources, such as LED assemblies.

Abstract: The present disclosure provides a mask plate, belongs to the field of display technology, and can maintain a uniform exposing interval, so that the exposure pattern has a uniform deformation amount and pattern size. A mask plate comprises opaque regions and transparent regions, and spacers of the same height are arranged in the opaque regions. Another mask plate comprises active regions and dummy regions, and spacers of the same height are arranged in the dummy regions. The present disclosure can be applied in a process for fabricating a color film substrate.

Abstract: Polymer compositions are described containing a thermoplastic polymer in combination with one or more components, such as a white pigment and optionally one or more reinforcing fillers. In one embodiment, the polymer composition can be formulated to have high reflective properties. In other embodiments, the polymer composition can be formulated so as to have desired melt flow characteristics. In still another embodiment, the polymer composition can be formulated so as to have desired mechanical properties, such as impact resistance.

Abstract: Polymer compositions are described containing a poly(1,4-cyclohexanedimethanol terephthalate) polymer in combination with a white pigment and optionally one or more reinforcing fillers. In accordance with the present disclosure, the composition also contains one or more reactive viscosity stabilizers. In order to prevent against yellowing, the composition is free of various aromatic epoxy resins, such as novolac epoxy resins. The polymer composition has excellent reflectance properties making the composition well suited for producing reflectors for light sources, such as LED assemblies.