Abstract: A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.

Abstract: A fastening device includes a threaded bolt, a first nut and a second nut. The threaded bolt includes a head and a threaded body extended from the head. The first nut is for engagement with the threaded body to sandwich at least one object between the first nut and the head. The first nut includes a convex face on a side. The second nut includes a concave face for tight contact with the convex face of the first nut so that the second nut causes the first nut to shrink and clamp the threaded body when the second nut is in firm engagement with the threaded body.

Abstract: A water purifier is disclosed to include a water tank, an ultraviolet lamp mounted inside the water tank, a flow meter, which detects the flow rate of the fluid being supplied to the water tank and outputs a corresponding flow rate signal, and a lamp driver formed of a programmable monolithic chip that receives the flow rate signal from the flow meter and controls the light intensity of the ultraviolet lamp subject to the flow rate of the fluid being supplied to the water tank.

Abstract: A direct current voltage boosting/bucking device includes a direct current voltage boosting circuit and a low drop-out (LDO) linear voltage converting circuit. The direct current voltage boosting circuit boosts an input voltage so as to generate an output voltage higher than the input voltage. The LDO linear voltage converting circuit converts the output voltage into a load voltage that is to be provided to a load, and controls the direct current voltage boosting circuit in accordance with a feedback signal from the load such that the output voltage and the load voltage have a minimum drop-out voltage differential therebetween and such that current flow through the load is maintained at a determined level.

Abstract: A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.

Abstract: A direct current voltage boosting/bucking device includes a direct current voltage boosting circuit and a low drop-out (LDO) linear voltage converting circuit. The direct current voltage boosting circuit boosts an input voltage so as to generate an output voltage higher than the input voltage. The LDO linear voltage converting circuit converts the output voltage into a load voltage that is to be provided to a load, and controls the direct current voltage boosting circuit in accordance with a feedback signal from the load such that the output voltage and the load voltage have a minimum drop-out voltage differential therebetween and such that current flow through the load is maintained at a determined level.

Abstract: A complex antenna apparatus including a base, a circular polarization antenna and a capacitance (inductance) cylinder loading monopole antenna. The base has a central through hole. The circular polarization antenna is disposed on the base and has a hollow feeding portion corresponding to the central through hole. The capacitance (inductance) cylinder loading monopole antenna is fixed on the base by inserting one end of the capacitance (inductance) cylinder loading monopole antenna into the central through hole.

Abstract: A complex antenna apparatus including a base, a circular polarization antenna and a capacitance (inductance) cylinder loading monopole antenna. The base has a central through hole. The circular polarization antenna is disposed on the base and has a hollow feeding portion corresponding to the central through hole. The capacitance (inductance) cylinder loading monopole antenna is fixed on the base by inserting one end of the capacitance (inductance) cylinder loading monopole antenna into the central through hole.

Abstract: An improved hammer driver includes a body with an outward flange on a lower portion thereof, a removable socket member adapted to driving a nut or bolt, a rotary member interconnecting the body and the socket member and including a radially extending rotary arm for being actuated to rotate the socket member, an impact member slidably sleeved on the body above the outward flange for sliding axially on the body to hammer against the outward flange, and a transmission device for rotating the rotary member and hence socket member when the outward flange of the body is hammered by the impact member.