Power supply for both AC and DC

• US 6,459,604 B1
• Filed: 08/21/2001
• Issued: 10/01/2002
• Est. Priority Date: 12/13/2000
• Status: Expired due to Fees

• Current Assignee: Smart Power Solutions, Inc.
• Original Assignee: Smart Power Solutions, Inc.
• Inventors: Youn, Dae-Young, Kim, Hun-June
• Primary Examiner(s): Sterrett, Jeffrey
• Assistant Examiner(s): Laxton, Gary L.
• Application Number:
  US09/933,844
• Publication Number:
  US 20020071290A1
• Time in Patent Office: 406 Days
• Field of Search: 363/142, 363/89, 363/100, 363/146, 307/11, 307/18, 307/22, 307/26, 307/43, 307/75, 307/82, 323/351, 323/353, 323/354
• US Class Current: 363/142
• CPC Class Codes: H01R 13/6675 with built-in power supply
• CPC Class Codes: H01R 31/065 with built-in electric apparatus
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02M 1/10 Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc

Abstract

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.

Claims

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.

2. The power supply as set forth in claim 1, wherein said output voltage controller includes:

a resistor array; and

a multiplexer for selecting a resistance of said resistor array in response to a value selected by a dip switch in said output voltage selector and outputting a control signal based on the selected resistance to said oscillator in said second PWM controller to select the voltage level of the output DC signal from said drive voltage output unit.