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SCR ELEKTRONIKS make Constant Voltage / Constant Current
Power Supply is precision constant Voltage /Constant Current
DC Power source. The basic design is very rugged & reliable.
The system is based on Preregulator / Series Regulator Principle.
Preregulator consists of a thyristorised circuit. The Input
AC Voltage supply is given to Thyristorised preregulator which
in turn is given to primary of the power transformer. Secondary
of the transformer is rectified and filtered with LC filter
to give lower ripple. The filtered output is given to series
pass transistor bank. To minimise the power dissipation in
series pass transistor bank, the Voltage across the transistors
is sensed and kept at 5 volt with the help of preregulator
module. When the output voltage is changed, the input to series
pass regulated is adjusted automatically (set voltage + 5
volt) so that voltage across transistor bank is maintained
o as to give required output voltage with minimum dissipation
in series pass transistor bank.
In Constant Voltage Mode, the voltage feedback (with + ve
output as reference & feedback from negative output) is
used for maintaining the output voltage constant. The output
voltage can be set with a potmeter provided on front panel.
In case there is a change in Input Supply voltage or drop
due to loading the corrective action is taken by series pass
elements with help of high gain amplifier. This voltage will
be maintained constant till the set current is more than the
load current. When the set current limit is exceeded the voltage
starts falling & the system goes into constant current
source.
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