Sinteza upravljanja i optimizacija frekvencije sklapanja DC/DC frekvencijskog pretvarača za superkondenzator

The article discusses design of mathematical model buck and boost converter and the analysis of the optimal frequency choice of the PWM signal for IGBT. The converter is dedicated for charging and discharging of hybrid car drive super-capacitor energy storage. The main role of the converter is to optimize energy content in super-capacitor storage used to acceleration and deceleration during driving period. Mathematical model of the system in MATLAB/Simulink and converter prototype with Freescale Digital Signal Processor 56F8257 were designed. Comparing of simulation results and results measured on the prototype are discussed on the end of the article.U radu se prikazuje izvod matematičkog modela silaznog i uzlaznog pretvarača te analiza odabira optimalne frekvencije PWM signala za IGBT. Razmatrani pretvarač namijenjen je za punjenje i pražnjenje superkondenzatora kao skladišta energije u elektromotornom pogonu hibridnog automobila. Glavna je uloga pretvarača optimizacija energije superkondenzatora za ubrzavanje i usporavanje tijekom trajanja vožnje automobila. Matematički model realiziran je u MATLAB/Simulink okruženju, a prototip pretvarača korištenjem Freescale Digital Signal Processora 56F8257. Na kraju rada dana je usporedba simulacijskih rezultata i mjerenja provedenih na prototipu

Frequency Characteristics of LV Electric Apparatus From the Point of PLC

Data transmittion via electric power networkis a new trend at computer communication (PLC- PowerLine Communication). Main advantage – very spread andrealy existing potential transmitting network is rathercomplicated due to strong interferences and network highlyvariable impedance conditions. Therefore different lowvoltage nerwork configuratins and its frequenycytransmitting characterics are studied

Modelling of Electric Vehicle Dynamics using dSpace DS1103

This article deals with a dynamic model of theelectric vehicle. The model is created in theMATLAB/Simulink and respects electric drive efficiency,traction battery charging/discharging efficiency and limitedbattery capacity. The model is prepared for uploading intothe dSpace DS1103 development hardware and it creates atthe same time the real-time system for modelling the electricvehicle dynamics. This system will allow connection with the80 kW dynamometer for the real energy flow in the electricvehicle. This system will be a part o

Analyza pracovnich charakteristik chranicoveho rele RF 7-1A.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Protokol o zkousce bleskojistek B230/10N a 230 97.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Vypocet zkratove odolnosti rozvadecu v kancelari Senatu Ceske republiky.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Analyza parazitnich vazeb v kabelove siti nizkeho napeti KB.

Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi