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Lamp power supply, Circuit (lamp driver) -1, 1. configuration -1 – Toshiba TLP511E User Manual

Page 5: Lamp power supply circuit (lamp driver), 1. configuration

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2-1

2. LAMP POWER SUPPLY CIRCUIT

(LAMP DRIVER)

2-1. Configuration

The lamp power supply cicrcuit receives a DC220 to

390V (primary side) from the system power supply and

provides a AC voltage (70 to 100V

AC

at ever turning on

the lamp) to turn on the lamp. Fig. 2-1-1 shows the block

diagram.

The DC voltage is supplied to CB1 from the main power

supply unit through an interlock switch. This voltage

becomes AC input

x

2

Ö

2 (= 340V for AC120V input)

when the lamp is off. CB2 is a connector for the lamp on

control signal input (SCI) and lamp off control signal

output (FLAG). When +5V is applied to SCI (CB2-1) in

the standby on, I122 FET transistor turns on, the igniter

develops a high voltage pulse (5 to 25 kV), and the lamp

starts to light up.

The pulse normally continues to be developed until the

lamp turns on (for max. 3s.). But if the lamp does not

turn on, I121 does not turn on, the voltage of CB2-3

develops high. I121 turns on and develops low after the

lamp turned on, the igniter circuit stops the operation.

Then the AC70 to 100V is applied to the lamp.

Fig. 2-1-1

L1

C1

R1

C2

P

ower

input

Lamp Driver

Stabilizer

Igniter

Commu-

tator

Control

I122

I121

Mains
isolated

100nF

1K

Cs

Rs

CB3

EMC GND

(optional)

CB2-1

SCI

CB2-2

Common

Flag

L1

L2

Lamp

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