Toshiba TLP510E Технічний навчальний посібник - Сторінка 5

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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

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

diagram.

EMC GND

The DC voltage is supplied to CB1 from the main power

supply unit through an interlock switch. This voltage

becomes AC input x 2Ö2 (= 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.

at ever turning on

Lamp Driver

Stabilizer

I122

CB3

CB2-1

SCI

(optional)

Commu-

Igniter

tator

Control

Mains

isolated

I121

100nF

CB2-2

Common

Flag

Fig. 2-1-1

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.

2-1

Lamp