User Manual – Rev B
FCS Series II
5.3.4 Control Board
The main function of the control board is to generate the gate drive signals for the front and rear
amplifier boards. Other functions include overcurrent and overtemperature protection, and
power supply fault detection.
The SIG HI oscillator signal from the current lim
it board is low pass filtered and sent to the
reference input of the control board error amplifier. Differentially sensed output voltage closes
r amp drives a 75 kHz pulse width modulator.
, which drive optical isolators to the full bridge
nd used on the control board
at
er of
nent cools
down.
level.
5.3.5 Current Transformer Board
the loop to the error amp. The output of the erro
Modulator output is sent to two gate drive circuits
switching devices.
Power amplifier switch current is sensed by current transformers a
to provide peak and average current limiting. Thermal switches mounted to the amplifier he
sink and one of the snubber resistors are used to sense overtemperature conditions. If eith
the switches is activated, the amplifier output is disabled until the overheated compo
A power supply comparator on the control board disables the amplifier output if the supply is
below a safe
The current transformer board, A
lifier, to
sense the output current of each
variable resistors used for curre
monitor connections to the outpu
front panel voltmeter on the curr
7, holds three current transformers, one per power amp
amplifier. The current transformers are terminated with
nt sense calibration. Also on the current transformer board are
t terminal block, TB3. These monitor signals are sent to the
ent limit assembly.
California Instruments
91
Summary of Contents for FCS Series II
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