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Note1. HIGH VOLTAGE REGULATOR CIRCUIT(DIGITAL TV)
This circuit uses in pulse width modulation method to check high voltage difference and then adjust
energy of storage trans. in order to compensation and stabilize high voltage.
1)Block Diagram
+
B INPUT
2) Circuit description
This circuit detect high voltage difference from FBT, will be compared with reference voltage of HVIC02.
The varied voltage will be changed pulse width modulation by PWM Generator HVIC02. This pulse will
vary energy of storage trans(TD402S) according to high voltage difference the varied energy is added to
basic high voltage pulse of FBT. As a result, this circuit will be stable high voltage.
2-1) Working description in case of high voltage Up & Down
In case high voltage goes up(or down) due to change of beam current, the voltage of high voltage
detection prove will be goes up(or down) according to Divider resistance value(which are inside of
FBT(T4440) and outside resistance), and this increased voltage will be supplied to PWM PULSE
IC(HVIC02) pin #1.
HIGH VOLTAGE
DETECTOR
HVR19
REFERENCE VOLTAGE
This IC(HVIC02) provide complete pulse width modulation system in a single monolithic intergrated
circuit.
The voltage which is inputed to HVIC02 pin #1 will be compared with reference voltage(HVIC02 pin #14,
5V), and then its difference voltage will be amplified.
Its value will be convert PWM in HVIC02, and then PWM pulse will be output from HVIC02 pin #9, #10.
Transistor HVQ01 is used as Buffer for impedance matching.
Samsung Electronics
HV OUT
TRANSISTOR
(QH406)
STORAGE
TRANS(TD402S)
PWM OUT FET(QH405)
(HVQ06 IC CURRENT CONTROL)
HVR20
1
HVR20
2
HVR14
3
14
F.B.T
(T444S)
PWM GENERATOR & CHECK
HIGH VOLTAGE DIFFERENCE(HVIC02)
HVIC02
HVDZ01
9
10
HVR10
4
Alignment and Adjustments
HIGH VOLTAGE
OUTPUT
HIGH VOLTAGE
CHECK
HVR36
TS13
HVQ01
F/S CHECK
PWM PULSE
OUT PUT
ASSY-H/V
MODULE
4-3
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