VHF Engineering PS-15C Manuale utente

170

WATkR

ROX

1971

RINGHAMTON

11902

607-721-9574

The PS-15C

a well filtered regulated 12-14 volt power supply capable of handlin

up to 15 amps.

designed for con~municationsequipment where maximum

current

drawn less than 50 pcrcent of the time. For continuous operation,

it must be derated

approximately

20 percent.

*%@W$

PS-15C SPECIFICATIONS

VOLTAGE OUTPUT: adjustable between 12 and 14 volts.

LOAD REGULATION:

percent fromno load to 15 anips.

CURRENT OUTPU'I 15 amps intermittent (50 percent duty cycle)

10 amps continuous.

CURRENT LIMITING: maximum short circuit current

amp nominal.

RIPPLE

50 MV at 10 amps.

AMBIENT TEMP:

maximum.

LIMITED WARRANTY

Factory wired units are warranted for one year. The unit must be re-

turned to the factory postpaid with a note describing difficulty

and

date of purchase,

include a check to cover return postage. Our liability under warranty

limited

to repair, adjustment or replacement of units proven to be defective. No further

warranty

expressed or implied. Units modified or obviously misused will

not be covered by the warranty.

The parts in kits built according to our instructions carry the original

manufacturers1warranty. Defective parts must

returned for credit. Units

built from kits may be returned to the factory for repair and alignment for a

nominal charge, plus parts and shipping.

WARNING!

The input power connection

the ac line potential (115 or

230V

ac). Use caution when working

in this area.

PARTS LIST

PS3A

(Kit 7010190)

(Wired 7010191)

25000

MFD

40V (2010610)

.OO1

(2010370)

470MFD 16V (2010570)

.001 (2010370)

.01 (2010410)

1K 5% (2020240)

2K Pot (2020510)

1OK 570 (2020340)

5.6K 1/2W (2020300)

330 ohm 570 (2020175)

390 ohm 5% (PS15) (2020180)

3.3K 570 (2020270)

ohm 5W (2020010)

Heat Sink Grease Capsule

(

3050200)"

P.C. Board (4040220-1)

Heat Sink

Small on PS3A

PS15 (4020100)

Large on PS25 (4020150)

3 Keystone Pins (4060130)

Hardware

Instruction Sheet (5010203)

*C1

not supplied with PS3A kit.

When using PS3A with external pass

transistors R7

changed to 100 ohm

W resistor (2020110)

CIRCUIT

l,3t'SCNIF"I

ION

The PS-3A regulator card can supply up to

amps of regulated 12-14 volts from

an unregulated source. It

designed for communicptions equipment where maximum

current

drawn less than 50 percent of the time. For continuous operation, it must be

derated to 3 amps with the heat sink supplied. The maximum current

limited by the

power dissipation (input voltage minus output times current) and the current capabilities

of the pass transistor, which

90 watts and 10 amps respectively at room temperature

for the TIP3055. With a supply voltage of 20 volts, the PS3A

will

handle 6 amps by

adding additional heat sinking to keep the case temperature of the TIP3055 below 120°

centigrade. With the addition of external pas€ transistors, currents up to amps can be

regulated.

When using the PS3A without external pass transistors, the maximum short

circuit current

amps. When used with external pass transistors,

R-7

changed

to100 ohms. The maximum 'current of 6 amps

multiplied

the number of pass

transistors. The unregulated input must be at least two volts above the output under

load to keep the pass transistors out of saturation. Any ripple on the input voltage

must be added to the 2 volts difference. When the pass transistor saturates regulation

lost.

THEORY

OPER.4TJON

The IVE550

a precision voltage regulator chip that contains a zener voltage

reference, operational amplifier, current limiter, and pass transistor. -4 portion of the

output voltage controlled by R-4

compared to a reference voltage, any difference or

error

amplified by the op-amp and changes the bias on the internal pass transistor to

eliminate the error. The reference voltage for the NE550

1.6 volts. Therefore, the

autput voltage is the ratio of the voltage divider (consisting of R-1, 2, and 3) times

The current limiter transistor saturates when a voltage of .6

applied between pins 2 and

3, shuting down the output. Therefore, with a

ohm resistor for R-5, the supply will

;hut $own

when.

a-~urrent

amps

reached.

The current limiting section of IC1 operates when

vol

between pins

and 3 of IC1. This voltage

the algebraic sum of

developed across R-5 and

R-7.

Reverse voltage

the result of

through R-5 and R-6 to ground. Its value

dependent mainly

and

the value of

R-6.

Forward voltage (disabling voltage)

applied across

R-7

by the

load current through the paralled

E-B

junctions of the pass transistors and

ohm

emitter resistors. Its value

a function of load current. When the voltage across

R-7

volts higher than the voltage across R-5, current limiting results.

3UPPLIES USING OVP

The over-voltage protection

(OliP)

is essentially a crowbar circuit which prevents

the output voltage from rjsing above 14 volts.

t!le

supply voltage (pot on PS3A board)

set too high, the OVP will shut down the supply as soon as it

turned on. To reset

the OVP: turn the power off

wait about one minute for the filter capacitor to discharge

turn the regulator pot down

reapply power

adjust the regulator pot for the desired output

voltage.

Install IC first. The

T1P

3055 transis!or

installed with the metal side down.

The

6-32

screw holds the heat sink on top

the transistor. Be sure to use some silicon

grease \)ctween

the

)]catsink and

the

trar~slfor.

The mctal part of

the

transistor

interndly connected to

t11e

collector. Therefore, the screw and heat sink have full

voltage on them. Care should be taken to prevent them from grounding out. Observe

pclarity on the electrolytic condensers. The board

usually mounted by the filter con

dcnser. If it'is used without the filter condenser (when used with an existing filtered

unregulated supply) it may be ]mounted on stand offs by drilling mounting holes

the

corners of the board,

PS15C INSTRUC'TIONS

Assemble the PS-3A regulator board as follows (referto the pictorial of the

parts layout).

)

Install the IC first, making sure the notch or dot

near

as marked on the board. b.) Bend the leads on Q1 towards the metal

side at a 90 degree angle. c.

)

Coat the metal side of Q1 with the white heat

sink grease and place it in the center of the

"U"

shaped heat sink. d.) Mount

this assembly to the component side of the circuit board with 6/32 hardware.

)

Mount the remaining components as shown. NOTE: Be sure to substitute

the 100 ohrn

watt resistor in the PS15C kit for the

ohm

watt supplied

with the PS-3A.

Remove the power transformer from the chassis and set it aside temporarily.

Mount the large filte~condensor with its bracket and four 6/32

$I'

screws

and nuts. The brac~etmust be preformed by placing the condensor on a flat

surface

ar.d

bending the bracket around it. Make sure the positive connection

of the condensor

towards the rear of the chassis before tightening the

bracket

3.) Mount the binding post, on-off switch and fuse holder as shown in the parts

layout. Mount the four rubber feet on the bottom corners of the chassis.

)

Insert a rubber grommet in the 318" hole on the rear apron. Insert the power

cord through the grommet and strip outside jacket 12" from the end. Place

the power transformer into the chassis with the primary on the right side

(looking from the front panel). Mount-the power transformer with

four

10132

screws, washers, and nuts. Be sure to place

nylon cable clamp

on the right rear corner of the power transformer as shown.

Slip the end of the power cord through the nylon cable clamp. The insulation

should be flush with the inside edge of the clamp. Tighten the 8/32 nut to

secure the power cord. Locate the green (ground)lead from the power cord

and measure 4" from the cable clamp and cut. Strip and solder to ground

lug located at the base primary side of the transformer.

TRANSFORMER PRIMARY WINDING

5.)

)

For llOV operation:

Cut and strip two 2" pieces

#I8

brown wire. Connect one wire from the

primary terminal

to terminal

#3.

Connect the other wire from

terminal #4 to terminal #2. Solder pins 2 and 3 only.

)

For 220V operation:

Cut and strip one

piece of #18 brown wire. Connect one end to

primary terminal

and the other end to terminal #3 power transformer

Solder both connections.

Locate the white wire coming from the power cord and measure

from

the cable clamp. Strip and solder to the primary terminal marked

(on

the pictorial). Locate the black'wire coming from the power cable. Run

it along the right hand side of the chassis, then across the front panel

underneath the binding post and bring it

to the center terminal of the

fuse holder. Strip and solder to the center fuse holder. Cut 3+" length of

#18 brown wire and strip both ends

8". Solder one end

the fuse holder

side terminal and the other end to the inner terminal of the on-off switch.

)

Cut a 5%"length of #18 black wire and strip both ends

8". Solder one end

to the remaining lug on the switch and the other end to terminal #4 on the

power transformer.

REFER

THE BRIDGE RECTIFIER DETAILED DRAWING DURING THE FOLLOWING

STEP

8.)

Prepare the following wires

a.) Cut a 10" black #14 wire and strip both ends

$I1.

b.) Cut a 5" black #14 wire and strip both ends

2".

)

Cut a 9" red #14 wire and strip both ends

2".

d.) Cut a

red #18 wire. Remove

$-I'

of insulation from the center of

the wire and strip both ends

2".

9-1

Solder the prepared wires into the bridge as follows:

a.) Solder one end of the 10" #14 black wire to the minus terminal.

b.) Connect one end of the red #14 wire to the positive terminal. Wrap

the center of the red #18 wire around the terminal and solder.

)

Crimp and solder a terminal lug to the red lead.

)

Crimp and solder a terminal lug to the end of both black leads.

10.) Mount the two pass transistors on the heat sink as follows:

)

Coat both sides of

mica insulator with heat sink grease. Slip the

coated insulator over the pins of the transistor. Carefully plug the

transistors through the heat sink into a socket held on theinside. Be

sure to orient the transistor sothe pins are centered in the holes of

the

heat sink and the positioning holes of the sockets line up properly

Secure the entire assembly using

518" self tapping screws.

THE PINS OF THE TRANSISTOR ARE INADVERTANTLY SHORTED TO THE HEAT

SINK, MAJOR DAMAGE TO THE SUPPLY CAN RESULT

heat sink.

standoff in the center hole closest to the edge of the heat sink

-40

318 screw and lock washer between the standoff and the

Coat the bottom of the previously prepared rectifier with heat sink grease

(place an 8-32

318" screw through the center hole in the rectifier and

mount it

the remaining hole between the transistors on the heat sink).

Secure with an 8-32

hex nut placed between the center heat sink fins.

Before tightening, align the bridge sothat it is parallel with the heat sink

and the red #18 wires are facing thelupperleft hand side.

13.) Connect two

ohm

watt resistors from the emitter connections of each

pass transistor to the standoff insulator. The emitter is the transistor

socket solder lug closest to the standoff. Put each lead through the hole

in the lug and crimp securely before soldering.

14.

)

Solder one

the red #18 wires from the rectifier to each pass transistor

collector. The collector

the center connection on the socket.

15.) Strip about of insulation off a 8" #18 green wire about 3 118" from one end.

Strip 114" off each end. Wrap the

bare section around the base lead lug

of the right pass transistor socket and solder. Connect the short end to the

other pass transistor base lead lug and solder.

Strip both ends of a 15"

#14

red wire back

3".

Strip both ends of a

#18

red wire back 1/4". Connect one end of each wire to the standoff insulator

and solder.

Take the heat sink, lay it fin side down, being sure that the bridge rectifier

closest to the rear edge of the chassis. Solder one of the secondary leads

on tbe power transformer to one of the terminals marked "AC" on the

bridge rectifier. Now solder the other secondary lead to the remaining lug

marked "AC" on the bridge rectifier.

Mount the heat sink to the main chassis with two 8-32

screws, washers

and nuts.

Mount the PS-3A board on the capacitor using #lo-32'hardware

the

following sequence: Screw

terminal lug

flat washer

board

capacitol

The lug on the two #14 black wires to the negative terminal (toward the

front cover), and the lug on the #14 red wire to the positive terminal.

Tighten both screws securely.

ANY

RESISTANCE AT THESE POINTS

WILL

HAVE AN ADVERSE EFFECT

REGULATION

20.

)

Connect the black #14 wire to the black terminal post. Connect the red #14

wire to the red terminal post. Connect a 220 ohm 2 watt resistor between the

terminal posts and solder.

21.) Solder the red #18 wire from the stand off insulator to the top (VS) terminal

on the PS-3A regulator card. Solder the green #18 wire to the bottom (VO)

terminal.

22-

Place the OVP on top of the capacitor bracket orienting it sothat the red

l$ad

opposite the red binding post and the black lead

opposite the

black binding post. Cut and strip leads, then solder the red lead to the

d binding post and the black lead to the black binding post. This completes

e wiring of the PS15C power supply.

BEFORE APPLYING POWER, CAREFULLY CHECK ALL SOLDER CONNECTIONS

B'INAL TEST AND ASSEMBLY

)

Install the fuse in the fuse holder (5 amp for 100V, 3 amp for 220V).

2.) Set the voltage adjust control (R-2) in the regulator card to mid position.

)

Connect a volt meter to the output terminals. Set the meteretoread

20-50 volts full scale.

4.) Pluginsupplyandturnswitchon.

AdjustR-2foranominal13.8volts

output

)

If the control

adjusted above 15 volts, the

will shut down the

supply. The

reset by turning off the supply for approximately

one minute (be sure to reset control to mid position).

Slide the four Tinnerman fasteners over the mounting holes on the main

chassis flanges.

Place the cover on theassiswith the beveled end toward the front. Line

up the mounting holes with the Tinnerman fasteners and secure the cover

using four

318 self taping screws.

Indice

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