Ohmic characteristic producing circuit for nonlinear load at low voltages, e.g. for railway signaling, has rectifier, power factor controller, and measuring resistance

摘要

A circuit to give an ohmic user characteristic for a nonlinear load at low voltage comprises a transformer, rectifier (GR) and choke to give a dc voltage for the load with a power factor controller (PFC) operated by a dc/dc converter through a measuring resistance (Rmt). A circuit to produce an ohmic user characteristic for a nonlinear load at low operating voltage comprises a transformer, rectifier (GR) and smoother to provide a dc voltage for the load with a power factor controller (PFC) comprising a switch transistor (T) and controller and operated by a dc/dc converter or voltage circuit through a measuring resistance (Rmt) and/or the output voltage (Ua) can be switched to the PFC input.