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 battery charging device suitable for a portable electronic device includes a rechargeable battery, a controlling chip, an adjusting transistor, a feedback circuit and a charger with adjustable output. The charger has an external alternating-current power source and provides a changeable voltage to the rechargeable battery of the portable electronic device. The feedback circuit captures a signal of electric quantities of the rechargeable battery and feeds back to the charger to adjust its output voltage and then the charger is controlled to charge the rechargeable battery. The adjustable transistor is used to control the charging of the rechargeable battery to reduce the number of parts of the battery charging device and waste of circuit traces.

Abstract: A DC-DC converter with a direct driven synchronous rectifier is disclosed, comprising: a DC-AC converter receiving a DC voltage; a transformer having one primary winding coupled to the DC-AC converter and at least two secondary windings; a synchronous rectifier having two transistors; and an output filter coupled to the synchronous rectifier, wherein the two transistors of the synchronous rectifier are driven by the two secondary windings of the transformer, respectively.

Abstract: A dual input power supply is provided, which comprises a dual input, a connector, a power converter circuit and an output. The dual input has a first input and a second input. The connector is an integrated magnetic element used for integrating the input powers having different power signals from the first input and the second input. The power converter circuit comprises an AC-to-DC converter, a DC-to-DC converter, a feedback circuit and a filter circuit. In the present invention, the dual input uses a set of transformer coils or inductive coils, thus the size of the present power supply can be reduced.

Abstract: The present invention provides a heat sink structure, which includes: a housing located on a material with low thermal conductivity; and a heat conductor placed inside the housing. At least one air gap is formed between the heat conductor and the housing to reduce the conductivity from the heat conductor to the housing, and thus increasing the thermal resistance between the heat conductor and the housing. The surface temperature of the bottom of the housing thus could be reduced and averaged, so as to effectively improve the lifespan, the safety and reliability of a device with the heat sink structure.

Abstract: A charging apparatus applied in a portable electronic product comprises a charging battery, a controlling chip, an adjusting transistor, a feedback circuit and a charger with modulateable output. The charger has an external alternating-current power source, and the charger provides a changeable voltage to the charging battery of the portable electronic product. Signals of electric quantities of the charging battery is captured by the feedback circuit to feedback to the charger to adjust its output voltage and then control the charger to charge the charging battery to achieve changeable voltage. Besides, only use the switch transistor to control charging the charging battery to reduce spare amounts and loss of circuit.

Abstract: The present invention provides a heat sink structure, which includes: a housing located on a material with low thermal conductivity; and a heat conductor placed inside the housing. At least one air gap is formed between the heat conductor and the housing to reduce the conductivity from the heat conductor to the housing, and thus increasing the thermal resistance between the heat conductor and the housing. The surface temperature of the bottom of the housing thus could be reduced and averaged, so as to effectively improve the lifespan, the safety and reliability of a device with the heat sink structure.

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.