Schaefer Electronics AC/DC Converter Modules from 8.5kW to 12kW.
Schaefer Electronics robust design uses industrial grade components and provides a high density, space-saving solution for applications in industries such as railway controls and industrial equipment (onboard and track side) oil rigs applications, fuel cell applications, transportation, telecoms systems, process control systems, and power stations.
Parallel operation Single output modules of the same voltage / power rating can operate in parallel under speciﬁc conditions. The output voltage can be carefully adjusted to be near identical. When there is sufﬁcient loading on the combined output, all units will be active and supply the load. The load demand must be signiﬁcant enough for the multiple units to deliver output current.
Redundant operation The inclusion of the option “dd” (decoupling diode) on the output of the units will permit parallel operation, where the inability to provide output from one unit will not have a negative effect on the load provision. The decoupling diode will also result in a load regulation value, which, as a percentage of the output voltage, will be unit / output dependent. In terms of calibration the same criteria follow as for parallel operation .
Power factor correction (PFC) Power supplies draw line current in pulses from the input supply. Should it be required, a PFC will integrate these pulses to be both, effectively sinusoidal in shape, and in phase with the AC input supply. The result of this integration, be it active or passive, is the reduction of the harmonic distortion and allows a more effective loading of the input source.
Spike suppression High input voltage spikes generated in the supply system that could disturb operation of the unit or cause damage will be absorbed by a varistor across the input lines .
Thermal shutdown with auto restart The higher power Schaefer modules are ﬁtted with a thermal shutdown. In the event of a temperature rise above a preset value, the unit will turn off. This safety feature will then remain active until the point of temperature measurement has reduced signiﬁcantly. The time duration for this to be reached is dependent upon the environment and level of cooling .