Inverter Circuit; Basic Configuration; Circuit Block Diagram - NEC LCD1550X Service Manual

1.8

Inverter circuit

1.8.1

Basic configuration

Oscillation circuit method: Self-exciting
Number of backlights: Four
Dimming method: PWM dimming

1.8.2. Circuit block diagram

12VDC input
FET switch
Latch circuit
Timer circuit
Voltage
comparison
(window
comparator)
Overvoltage
detection
Waveform
shaping
lamp current detection protection circuit
Waveform
shaping
Resonance circuit 1
PWM
dimming
circuit
1 - 42
Resonance circuit 2
Back light
Transformer