Explanations Of Major Circuits; Main Dc Power Supply; Power Amp, L.p.f - Tokyo Hy-Power HL-1.5KFX User Manual

11. Explanation of Major Circuits
Five major circuit blocks are explained in there basic form and using signal flows.

11-1 Main DC Power Supply

11-2 Power Amp, L.P.F.

11-3 RF Power Detector, TX/RX Switching
11-4 Main Controller
11-5 Band Decoder, Frequency Counting
11-1 Main DC Power Supply
The main DC power supply feeds the 50V DC power to the final PA stage. It is a non-regulated power
supply and consists of the compact power transformer using an oriented core, a bridge diode rectifier,
and a high capacity electrolytic capacitor of 68,000uF for the filter. A soft start circuit suppresses the AC
rush current using a thyristor. A part of 50V line is converted to 24V using a DC-DC converter and is
supplied to the cooling fan.
AC I N
LI NE FI L
PC 1611DC
AC PO WE R
FA N
24V
CN DC 24B7V
PO W ER SW
SU B POW ER
BW S12SX-U
TH RM
AC MA IN
SS R
X-FO RM ER
PC 1611FN
VD 53V
DC / D C
HP H1 2002M
DIOD E CA P
BRIDGE 68000uF
S5 0V B60
15A 60m V
19
PO WE R AM P
VD 53V
SD 2933/ THP2933
VD G
Ma in Cont r ol
VD 53V
ID
MP U
AC 15V
High/L ow