Radio Shack 43-222B Manual de usuario descargar pdf (Pagina 19)

US

8,212,386

B2

9

the

user

as

to

Which

color

is

associated

With

his

portable

consumer

device.

Using

such

color

codes

(or

other

indica

tors),

the

user

Will

know

Which

connector

220,

222

to

use,

and

Will

knoW

hoW

to

position the

sWitch

218.

The

embodiments

described

With

respect

to

FIGS.

6(a)-6

(0)

have

a

number

of

additional

advantages.

In the

embodi

ments

described

With

respect

to

FIGS.

6(a)-6(0),

it

is

highly

unlikely

that

a

user

Would

use

the

Wrong

connector

With

his

portable

consumer

device

and

consequently

damage

his

por

table

consumer

device.

For

example,

to

potentially

damage

his

portable

consumer

device,

the

consumer

Would

need

to

select

the

incorrect

sWitch

position,

and

also

select

the

incor

rect

connector.

If

the

consumer

selects

the

incorrect

sWitch

position,

but

the

correct

connector,

then

the

poWer

supply

Would

output

0

Volts.

For

example,

referring

to

FIGS.

6(b)

and

6(0),

the

user

may

have

a

computer

that

is

poWered

by

16

VDC.

The

user

may

incorrectly

close

the

sWitch

218

as

shoWn

in

FIG.

6(0)

and

may

incorrectly

select

a

19

VDC

output.

If

the

user

selects

the

correct

connector

220

that

is

associated

With

a

16

VDC

output

as

shoWn

in

FIG.

6(b),

and

mechani

cally

couples

it

to

the

output

connector

299,

then

the

output

of

the

connector

220

Would

be 0

Volts,

since

the

contacts

220(0)

Would

not

be

coupled

to

the

live

19

VDC

contact

294.

Thus,

the

user

Would

not

inadvertently

supply

the

incorrect

voltage

to

his

computer.

The

embodiments

shoWn

in

FIGS.

6(a)-6(0)

are

much

safer

for

the

consumer

to

use

and

make

it

more

likely

that

the

user

Will

not

inadvertently

provide

the

Wrong

output

voltage

to

his

computer.

The

embodiments

described

With

respect

to

FIGS.

6(a)-6

(0)

speci?cally

relate

to

anAC

to

DC

poWer

supply

system.

It

is

understood

that

the

same

general

principles

may

apply

to

a

DC

to

DC

poWer

supply

system

(as

described

above

With

respect

to

FIG.

5)

and

a

combinationAC

to

DC

and

DC

to

DC

poWer

supply

system

(as

described

above).

For

example,

the

DC

to

DC

converter

shoWn

in

FIG.

5

can be

modi?ed

With

one

or

more

sWitches

to

open

and

close the

circuits

including

the

16

VDC

and

19.5

VDC

contacts.

Other

embodiments

of

the

invention

can

be

described

With

reference

to

FIGS.

7(a)-7(0).

These

embodiments

can

use

a

voltage

output

indicator

device

to

indicate

the

voltage

that

is

being

output

by

the

poWer

circuit

in

the

poWer

adapter.

Using

the

indicator

device,

the

user

can

be

certain

that

he

has

selected

the

correct

voltage.

FIG.

7(a)

shoWs

a

block

diagram

of

a

poWer

circuit

accord

ing

to

an

embodiment

of

the

invention.

The

poWer

circuit

converts

AC

poWer

to

DC

poWer.

The

poWer

circuit

includes

an

AC

input

line

378,

Which

provides

an

AC

voltage

(e.g.,

100-240

VAC)

to

a

recti?er

and

an

optional

?lter

380.

The

AC

input

line

378

may

receive

an

AC

voltage

from

an

AC

source

such

as

a

poWer

outlet in

a

home.

The

recti?er

and

?lter

380

changes

the

AC

input

voltage

to

a

DC

output

voltage

(e.g.,

50-120

VDC).

The

DC

output

voltage

is

then

fed

to

an

inverter

382,

Which

generates

an

AC

voltage

(e.g.,

20

kHZ

at

50-120

VAC)

that

is

stepped

doWn

by

a

transformer

384

(e. g.,

20-60

VAC).

The

stepped-doWn

AC

signal

is

then

sent

to

another

recti?er

and

optional

?lter

combination

386,

Where

the

AC

voltage

is

changed

to

a

DC

voltage

(e.g.,

25-60

VDC).

The

DC

voltage

is

then

fed

to

a

variable

regulator

310

Which

produces

output

voltages

at

contacts

391,

392

respectively,

depending

on

the

state

of

the

sWitch

218.

A

speci?c

embodi

ment

of

the

present

invention

provides

output

voltages

of

1

9.5

VDC

and

16

VDC,

though

other

embodiments

of

the

present

invention

may

provide

other

output

voltages.

A

feedback

line

316

provides

a

signal

back

to

the

inverter

382

to

regulate

the

output

voltages.

In

this

embodiment,

there

are

tWo

output

contacts

391,

392

coupled

to

the

variable

regulator

3

1

0,

instead

of

three

as in

the

20

25

30

35

40

45

50

55

60

65

10

embodiments

described

above

With

reference

to

FIGS.

6(0)

6(0).

The

tWo

output

contacts

391,

392

may

comprise

a

ground

contact

391

and

a

positive

voltage

contact

392.

The

state

of

the

positive

voltage

contact

can

be

16

or

19.5

volts,

depending

upon

the

state

of

the

sWitch

218.

For

example,

if

the

sWitch

218

is

closed,

then

the

output

voltage

may

be

16

VDC.

If

the

sWitch

218

is

open,

then

the

output

voltage

may

be

19.5

VDC.

Although

the

sWitch

218

has

tWo

discrete

states

in

this

example,

it

is

understood

that

it

may

have

more

than

tWo

discrete

states

in

other

examples.

The

poWer

supply

system

may

also

comprise

a

voltage

output

indicator

device

259. In

this

example,

the

voltage

output

indicator

device

259

comprises

a

sense

element

332

such

as

a

chip,

and

lighting

elements

such

as

LEDs.

Referring

to

FIG.

7(a),

the

sense

element

332

may

be

electrically

coupled

to

the contacts

392, 391.

The

sense

element

332

may

sense

the

voltage

of

contact

392,

and

may

cause

a

blue

LED

352(a)

to

light

up

if

the

voltage

of

the

contact

392

is

at

16

VDC

and

may

cause

a

green

LED

352(b)

to

light

up

if

the

voltage

ofthe

contact

392

is

at

19.5

VDC.

At

least

part

(e.g.,

the

LEDs)

of

the

voltage

output

indicator

device

259

is

in

the

output

connector

255,

to

help

the

user

select

the

correct

con

nectable

connector.

As

shoWn

in

FIGS.

7(b)

and

7(0),

tWo

connectors

322,

324

may

be

removably

coupled

to

the

output

connector

255 con

taining

the contacts

391, 392.

Each

connector

322,

324

com

prises

a

main

portion

322(0),

324(0)

and

a

mating

portion

322(1)), 324(1)),

as

Well

as

contacts

322(0), 324(0),

Which

can

connect

to

the contacts

391,

392

in

the

output

connector

255.

Each

connector

322,

324

may

also

comprise

an

indicator

344,

336. In

this

example,

the

indicators

are

static

indicators

such

as

color

stickers

or

color

labels.

The

different

mating

portions

322(1)),

324(1))

may

have

different

form

factors

so

that

they

mate

With

different

poWer

connectors

on

respectively

differ

ent

portable

consumer

devices.

To

choose

the

correct

state

of

the

sWitch

218 and

conse

quently

the

correct

voltage,

the

user

may

look

on

a

chart

Which

shoWs

his

computer

and

may

match,

for

example,

the

color

blue

to

his

computer

if

his

computer

Will

accept

16

VDC.

An

example

of

such

a

chart

is

shoWn

beloW.

As

shoWn,

there

can

be

a

column

for

a

computer

manufacturer,

the

indi

cator

state

(color

code)

associated

With

the

manufacturer’s

computers,

the

voltage

range

accepted

by

the

manufacturer’

s

computers,

and

possible

connectors

(e.g.,

identi?ed

by

letter)

that

can

be

used

With

the

manufacturer’s

computers.

Computer

Manufacturer

Color

Code

Voltage

Try

This

Connector

ManufacturerA

Green

17-21

V

D,

H

Manufacturer

B

Green

17-21

V

E,

H,

I

Manufacturer

C

Blue

14-17

V

H,

1

After

the

user

identi?es

the

color associated

With

his

com

puter,

the

user

may

then

select

the position

on

the

sWitch

218

Which

may

be

associated

With

the

selected

color

(e.g.,

blue).

After

the

user

manipulates

the

sWitch

218,

the

user

may

look

at

the

blue

indicator

344 on

the

connector

324

and

may

then

couple

the

conductors

324(0)

in

the

connector

324

to

the

contacts

391,

392

in

the

output

connector

255.

By

using

LEDs

With

different colors,

the

user

has

a

refer

ence

to

What

the

output

voltage

the

poWer

adapter

is

produc

ing

at

any

moment.

For

safety

purposes,

the

user

can

check

to

see

if

there

is

agreement

betWeen

the

connectable

connector

color,

the

LED

color

in

the

output

connector,

and

sWitch

color

before

plugging

the

poWer

supply connector

into

his

com

puter.

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