Power S Upply - OM POWER OM2000+ Manual

The output of the amplifier is a Pi-­‐L circuit. The ceramic capacitor for TUNE and LOAD are divided.
This e nables t he a mplifier t o b e t uned e xactly a nd m akes i t p ossible t o e asily r eturn t o t he p reviously
set p ositions a fter b and c hanges.
Top v iew o n t he o pened O M2000+
Tetrode F U728F A ntenna S witch Blower P ower S upply B oard Switch-­‐ON B oard
Output P i-­‐L C ircuit T uning C apacitor S ubpanel H V t ransformer
3.2. Power S upply
Power amplifier is using one 3 KVA toroidal transformer. A soft start is provided using relays and
resistors ( placed o n t he s witch-­‐ON b oard). T he h igh v oltage i s m ade b y c ombining 4 x 5 30V A C ( total
abt. 2 950V D C) @ 1 .2A. E ach h as i ts o wn r ectifier a nd f ilter. I n t he h igh v oltage c ircuit, s afety r esistors
are e mployed t o p rotect t he a mplifier a gainst o verload ( placed o n t he p ower s upply b oard).
The s eparated s upply f or s creen g rid i s r egulated b y s tabilization w ith M OSFET a nd d elivers a bt. 3 30V
DC a t 1 00mA. C ontrol g rid v oltage i s a lso s tabilized ( -­‐120V D C). C hange o f s tabilized f irst g rid v oltage
is c ontrolled b y t he s oftware ( EBS f or e xample).
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