Abstract: A power supply device comprising a switch assemble, a voltage transformation circuit and a processor is disclosed. The switch assemble may include a first switch and a second switch connected with each other in parallel. After the first switch turns on, the voltage transformation circuit is electronically coupled to AC power and provides a DC voltage output for powering the processor to turn on initially. The first switch will turn off after the processor is powered up, and the powered processor operates to control the second switch to turn on so that the voltage transformation circuit is coupled to AC power through the second switch and provides DC voltage output for enabling the processor to continue to operate. The processor is further configured to control the second switch to turn off according to performances of a load coupled to the transformation circuit.

Abstract: The present invention provides a mini switch assembly at low costs and being able to display on or off state of it. The switch assembly in accordance with the present invention includes a pushbutton that has an opening allowing a transparent cover installed in it; a circuit board having a circuit and defining a first conductive section being insulated with a second conductive section; a conductive elastic part coupled to but its body section separated from the first conductive section. When the pushbutton applies a force to the elastic part, the body section is forced to contact the second conductive section and as a result, the first conductive section is conductively coupled with the second conductive section, triggering a drive circuit on the circuit board to provide power to turn the LED on. Also, the elastic part has an opening aligned with the pushbutton opening to allow the LED to be installed on the circuit board via these two openings.

Abstract: The present invention relates to a portable battery charger, which includes a charger body of charge circuit coupled to a power supply and a battery compartment pivotally coupled to the charger body. The battery compartment rotates pivotally around the charger body to provide a fold position at which both battery compartment and charge body form one unit and a charge position at which at least one battery is inserted into the battery compartment for charging. The battery charger in accordance with the present invention shrinks its size to the charger body with a feature of easy carry.

Abstract: The present invention provides a mini switch assembly at low costs and being able to display on or off state of it. The switch assembly in accordance with the present invention includes a pushbutton that has an opening allowing a transparent cover installed in it; a circuit board having a circuit and defining a first conductive section being insulated with a second conductive section; a conductive elastic part coupled to but its body section separated from the first conductive section. When the pushbutton applies a force to the elastic part, the body section is forced to contact the second conductive section and as a result, the first conductive section is conductively coupled with the second conductive section, triggering a drive circuit on the circuit board to provide power to turn the LED on. Also, the elastic part has an opening aligned with the pushbutton opening to allow the LED to be installed on the circuit board via these two openings.