DC/DC Converter
PSC30
User Manual
Page 7 (24)
©2009. ELTEK VALERE DEUTSCHLAND GmbH.
UM_PSC30_E_EVD_2011-01-19.doc
5.2
Electrical function description
The SMPS unit consists of the following main functional components:
1.
Input filter suppressing the feedback of high frequency interference produced by the unit into
the mains as well as for the attenuation of the interference voltages and voltage transients
superimposed on the mains.
2.
Rectifier (polar protection) with synchronised power controller (operating frequency 100 kHz)
for converting the input voltage into a pre-regulated DC voltage of approx. 380V (DC input 110V
DC: 170V), regulating the input voltage curve and restricting the inrush current.
3.
Transistor bridge circuit for converting the 380 (170)V DC into a pulse-width regulated stepped
voltage with a frequency of 100 kHz.
4.
Power transmitter to the potential separation and voltage adaptation at the secondary side
5.
Rectifier with fast switching diodes
6.
LC filter for smoothing the DC- voltage ripple at the rectifier output
7.
Output filter for smoothing the interfering voltages on the output voltage
8.
Auxiliary current supply for the internal power supply to the control components with potential
separation at the primary and secondary side.
9.
Regulating line with potential separation by optocoupler.
10.
Operating component with parameter adjustments, signalling, monitoring and indication ele-
ments
5.2.1 Electrical insulation
Due to the corresponding construction of the unit and of the components as well as design of sepa-
rated connections of the input and output circuits.
The SMPS series V
o
60 V DC fulfil EN 60950 and VDE 0100 Standard; i.e. protection against
shock currents due to the functional extra low voltage with a safe electrical insulation.
The SMPS series V
o
> 60 V DC fulfil the safe electrical insulation up to V
o
= 220 V DC according
to EN 60950 and VDE 0160 Standard.
