APPENDIX F OPERATION AND MAINTENANCE OF SOLA CVDC POWER SUPPLY

TM 11-5895-932-14&P

APPENDIX F

OPERATION AND MAINTENANCE

OF SOLA CVDC POWER SUPPLY

TYPE 28-1561-2

F-l. General Description

and full load. The output voltage is regulated to

1% over an input line variation of 100 to 130

The SOLA CVDC Power Supply Type 28-1561-2

volts RMS.

is a regulated constant voltage power supply which

The power supply shall not be operated in an

is designed to furnish regulated dc voltage. Within

ambient of greater than 50 C or stored at a

the limits of the specifications, this regulated

temperature greater than 85 C.

supply will deliver regulated voltage despite

F-2. Principles of Operation (Figure F-I)

changes in input line voltage, line frequency, load

impedance and temperature as described in the

The heart of the regulator is the constant voltage

specification limits.

transformer. A constant-voltage transformer has a

The power supply consists of a constant voltage

magnetic core structure different from conventional

transformer (described in greater detail under

transformers. It has a magnetic shunt with a fixed

principles of operation), a rectifying means and a

air gap interposed between the primary and

filter circuit. The transformer not only converts

secondary windings. The secondary winding is

the incoming line voltage to the desired level, but

shunted by a fixed ac capacitor. Upon application

also is the regulating means. The rectifiers, by use

of primary voltage, the secondary voltage increases

of conventional circuitry, convert the ac to dc. The

to the point at which that portion of the magnetic

filter circuit reduces the magnitude of the ripple to

core directly under the secondary winding ap

the desired specification level.

proaches saturation due to the capacitative load

The output ripple at full load and nominal input

connected across the secondary winding.

voltage is less than 1% RMS. The nominal output

voltage tolerance is 1% at nominal input voltage

F-1