초록 ▼

A power supply for both alternating current (AC) and direct current (DC) which has an AC/DC converter and DC/DC converter detachably coupled with each other. The AC/DC converter is adapted to convert an AC input voltage into a DC signal, and the DC/DC converter is adapted to convert a DC input volta

A power supply for both alternating current (AC) and direct current (DC) which has an AC/DC converter and DC/DC converter detachably coupled with each other. The AC/DC converter is adapted to convert an AC input voltage into a DC signal, and the DC/DC converter is adapted to convert a DC input voltage into a DC signal. An output voltage selector is provided to obtain a DC output voltage appropriate to an associated device. The present power supply can be conveniently carried, supply power to an associated device regardless of AC and DC input voltages and select a level of an output DC voltage. Therefore, the present power supply can be used universally irrespective of the types of associated devices and manufacturers.

대표청구항 ▼

1. A power supply for both alternating current (AC) and direct current (DC), comprising:an AC/DC converter including a first line filter for attenuating electromagnetic noise contained in an AC input voltage, a rectifier for converting a filtered AC signal from said first line filter into a DC signa

1. A power supply for both alternating current (AC) and direct current (DC), comprising:an AC/DC converter including a first line filter for attenuating electromagnetic noise contained in an AC input voltage, a rectifier for converting a filtered AC signal from said first line filter into a DC signal, a transformer for transforming the DC signal converted by said rectifier into a desired DC voltage, and a first pulse width modulation (PWM) controller for controlling an operation of said transformer; a DC/DC converter detachably coupled with said AC/DC converter, said DC/DC converter including a second line filter for inputting said DC voltage from said AC/DC converter or an external DC voltage and attenuating electromagnetic noise contained in the inputted DC voltage, a drive voltage output unit for converting a filtered DC signal from said second line filter into a drive voltage to drive an associated device, a second PWM controller for controlling an operation of said drive voltage output unit, and an output voltage controller for controlling a voltage level of an output DC signal from said drive voltage output unit; and an output voltage selector connected to said DC/DC converter, said output voltage selector selecting a voltage level appropriate to the associated device and controlling an operation of an oscillator in said second PWM controller according to the selected voltage level so as to control the voltage level of the output DC signal from said drive voltage output unit.