Abstract: A synchronous rectification control circuit is connected with a secondary-side rectification circuit and includes a driving circuit, a dead-time acquisition circuit, and a zero-voltage detection circuit. The driving circuit includes a differentiating circuit, a first comparator, and a capacitor, wherein the differentiating circuit generates a signal to the first comparator and the capacitor functions to charge and discharge to form a cycle. The dead-time acquisition circuit includes a second comparator and a third comparator, wherein the second comparator has a positive input connected to an output of the first comparator of the driving circuit, the second comparator has an output connected to a positive input of the third comparator, and the third comparator has a negative input connected to the output of the first comparator to acquire a dead-time signal.

Abstract: A waterproof casing for a power supply has a lower casing, an upper casing, an inlet cover and an outlet cover. The lower cover contains electronic components. The upper casing is mounted on the opening of the lower casing and has an inlet cavity, at least one inlet, an outlet cavity and at least one outlet. The at least one inlet and outlet are formed through the upper casing and respectively communicate with the inlet cavity and outlet cavity. The inlet cover and outlet cover respectively seal the inlet cavity and the outlet cavity, communicate the inlet cavity and the outlet cavity with the lower casing to allow the air to flow inside the casing and to keep the water from flowing in the inlet cavity and the outlet cavity. Structure of the waterproof casing is simplified, so benefits manufacturing.

Abstract: An electronic apparatus has an electronic component and a pin mount. The electronic component has a working surface and two pins protruding from the working surface and each pin being bent to form an L-shape with a proximal part and a distal part. The pin mount has a flat bottom, a rear, two through holes and two communicating recesses. The through holes are defined through the pin mount in parallel, are formed from the front to the rear and receiving the proximal parts of the pins. The communicating recesses are formed in parallel in the front from the through holes toward the bottom of the pin mount, communicate respectively with the through holes and receiving the distal parts of the pins. The pin mount immobilizes the electronic component to prevent the pins from being detached from the electronic component or the PCB to retain the lifetime of the pins.

Abstract: A waterproof casing for a power supply has a lower casing, an upper casing, an inlet cover and an outlet cover. The lower cover contains electronic components. The upper casing is mounted on the opening of the lower casing and has an inlet cavity, at least one inlet, an outlet cavity and at least one outlet. The at least one inlet and outlet are formed through the upper casing and respectively communicate with the inlet cavity and outlet cavity. The inlet cover and outlet cover respectively seal the inlet cavity and the outlet cavity, communicate the inlet cavity and the outlet cavity with the lower casing to allow the air to flow inside the casing and to keep the water from flowing in the inlet cavity and the outlet cavity. Structure of the waterproof casing is simplified, so benefits manufacturing.

Abstract: An electronic apparatus has an electronic component and a pin mount. The electronic component has a working surface and two pins protruding from the working surface and each pin being bent to form an L-shape with a proximal part and a distal part. The pin mount has a flat bottom, a rear, two through holes and two communicating recesses. The through holes are defined through the pin mount in parallel, are formed from the front to the rear and receiving the proximal parts of the pins. The communicating recesses are formed in parallel in the front from the through holes toward the bottom of the pin mount, communicate respectively with the through holes and receiving the distal parts of the pins. The pin mount immobilizes the electronic component to prevent the pins from being detached from the electronic component or the PCB to retain the lifetime of the pins.

Abstract: A voltage stabilizer circuit of forward converter is disclosed to include a transformer, a first switch, a rectifier, an error amplifier, a control circuit, and a driving circuit. The control circuit outputs a regulation signal that controls turn-on time of the first switch, keeping the output of the load voltage at a stable level.

Abstract: An electrical device with a retractable plug has a body and a plug-moving assembly. The body has a chamber, a partition and a plug. The partition is formed in the chamber, separates the chamber into a plug chamber and an electronics chamber. The plug chamber has a longitudinal sidewall, a slot and an opening. The longitudinal sidewall is disposed parallelly with the partition and has an inner surface. The slot is formed through the longitudinal sidewall. The opening is formed through the end wall. The plug-moving assembly is mounted in the plug chamber and connects to the plug to selectively retract the plug into the plug chamber. Therefore, the plug of the electrical device may be selectively retracted to prevent prong damage, improve safety and aesthetics of design.

Abstract: A power adapter includes a housing formed of a bottom cover shell and a top cover shell and having an air passage extending across the bottom cover shell and an exhaust port in the top cover shell, a PC board mounted in the housing, two heat sinks covered on the PC board for absorbing heat from the primary and secondary sides of the PC board respectively for enabling absorbed heat to be carried to the outside of the housing by outside cooling air that is circulating through the exhaust port and the air passage, and a spacer set in the air passage between the heat sinks and working with the heat sinks to protect the PC board against outside dust and water.

Abstract: A power-saving power supply unit including a E.M.I. filter, a rectifier, a switching circuit, an output circuit, a kick circuit, a driver circuit, an auxiliary BAIX, and a control circuit, whereby the power supply unit gives no output as the control circuit is connected to 110 V AC power supply through a DC switch thereof; the output circuit provides a stable output power supply, as the DC switch of the control circuit is switched on.