6
Both the input stages are provided with an Active Power Factor Correction (PFC) to ensure an accurate power unit input
current waveform with extremely low harmonic content, exceeding the requirements of EN61000-3-2. These stages also
provide active input current limiting which prevents overloading of each input stage while maintaining high power factor.
The output of the two PFC stages charge their respective hold-up electrolytic capacitors which store enough energy to allow
the system to continue operating during minor line disturbances. These are the only electrolytic capacitors in the entire power
supply and to further increase system reliability, long life and high temperature capacitors are used.
Highly efficient zero voltage switching circuits (ZVS) are used to drive the medically isolated transformers from the hold-up
capacitors. The output modules of each section connect to their respective transformer secondary and provide safe isolated
power to a high performance synchronous rectifier power converter which is controlled using the latest analog control
technology to produce superior output performance in an extremely reduced size.
Two built in fans, which speed is automatically controlled, ensure the unit proper cooling in any operating condition
maintaining at minimum its RPM and, in turn, acoustic noise. The control function directly correlates each fan supply voltage to
the control voltage derived from the respective half bridge current sense resistor. The secondary control input is derived from
non-linear temperature sensors located near the rectifiers on each input section.
DISTRIBUTED BY TEXIM EUROPE