Ckd Praha, Oborovy Podnik

Jan Krtek

Josef Cibulka

Jiri Winkler

Richard Jelinek

Jaroslav Hlousek

Milan Kondr

Jan Bryksi

Vladimir Mickal

Vladimir Mlynar

Josef Simacek

Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutation in the phases are separated and the accumulated power of capacitors of the inverted rectifier is, without losses, discharged to the current source and thus to the load of the inverted rectifier.

Circuit arrangement of an inverted current rectifier with self

A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter. The sum of the time dependent voltage of a load phase and of an auxiliary time dependent voltage is formed, wherein the auxiliary time dependent voltage is the same for all converter phases. The pulse duration of the output voltage of each converter phase is modulated with said voltage sum.

Process of pulse duration modulation of a multi-phase converter

Circuit arrangement for inverters with three stage self-commutation suitable for large outputs and for parallel connection of main thyristors and separating reactors.

Circuit arrangement for self-commutated inverters

A test circuit for determining when one of a number of source voltages deviates from its set point. Each source voltage has coordinated comparison circuit which compares the voltage with a preset value, and which has a limited range of output voltage. Each comparison circuit has its output connected to a switching circuit. The output of each switching circuit is connected to a short circuit coil of one coupling transformer. The coupling transformer is fed from an auxiliary current source through an auxiliary coil and has as output a pick-up coil connected to an evaluation device.

Growing community of inventors

Karlovy Vary, Czechoslovakia

Jan Krtek