Self-regulated current rectifier with quasi=resonant d.c. voltage intermediate circuit - contains resonant circuit choke between constant voltage source and power switches forming triggering resonant circuit with capacitor

摘要

The current rectifier contains a resonant circuit choke in the line from a constant voltage source to rectifier power semiconductor switches. The choke forms a resonant circuit with a capacitor between the switch ports on the d.c. side to switch the switches when the intermediate circuit voltage approaches null. The choke is bridged by a series circuit contg. a clamp capacitor and a clamp power switch and antiparallel clamp diode. The resonant circuit capacitor (Cr) is connected in series with a resonant circuit switch (Ts) bridged by a diode (Ds) conducting in the direction of the constant dc voltage (Ud). USE/ADVANTAGE - Cost of power switches is reduced, high losses in the semiconducting clamp switches avoided and full utilisation of the constant dc voltage ensured.