The present invention relates to a control method for supporting active power factor correction (APFC) loads, comprising: providing square wave width of an output voltage waveform to be a comparatively large value to improve effective value of the output v...

A power conversion system (50) includes a power transformer (62) for receiving AC power at a first voltage from an input side (52) and for delivering AC power at a second voltage to an output side (56). A power converter (60) is also included in the power ...

An apparatus for controlling the power used in required operating conditions that vary over time, particularly for supplying power to lighting systems, using solid-state technology and comprising an inverter unit (1) which, above a certain value of voltage...

A partial converter system (2) includes a branch pair (3) comprising two series-connected driven power semiconductor switches with each having a diode reverse-connected in parallel. The branch pair is connected in parallel with branch pairs (13,14) connect...

The electrical network conditioner includes a transformation circuit, with voltage converters, which takes an input in parallel from a distribution line. The circuit generates a compensating voltage which is then to be applied in series in one of the distr...

The charging voltages (U(LA),U(LB),U(LC)) are generated in response to a drive signal, such that the charging currents (I(LA),I(LB),I(LC)) injected in the corresponding phases (A,B,C) is proportional to a phase system voltages (U(NA),U(NB),U(NC)) of corres...

A dynamic voltage restorer circuit 14 comprises capacitive storage means 16, switch means 18 and control means 20. The switch means 18 includes an array of anti-parallel diodes 34 and switchable uni-directional devices 36. Appropriate control of the switch...

The method involves driving an inverter (4) with control signals formed from a reference feed voltage (Uein, ref) to produces a feed voltage for one of the phases (R,S,T) of an a.c. network. The sum of the feed voltage and a network voltage (UN) correspond...

The device has loads connected to an a.c. sub-network connected to a supply via a switch and a primary winding of a coupling transformer. The a.c. side of a first current converter is connected between the switch and primary winding. The a.c. side of a sec...