SECONDARY POWER SUPPLY Russian patent published in 2004 - IPC

FIELD: electrical engineering; electric welders.

SUBSTANCE: secondary power supply has controllable power rectifier, transistor inverter whose input is connected to dc current leads of mentioned rectifier, matching transformer connected through primary winding to transistor inverter output and through secondary winding, to diode rectifier. Diode rectifier has its dc leads connected to load through series-connected smoothing reactor to organize main power supply to load. It also has standard control circuit. Novelty is that mentioned matching transformer has one more secondary winding connected through series-connected capacitor across two opposite ac terminals of diode bridge whose opposite dc terminals are connected through L-shaped filter to load in parallel with main power supply. L-shaped filter has reactor connected in series between one of leads of mentioned diode bridge and respective lead of load; filter capacitor incorporated in this filter is connected in parallel with load.

EFFECT: reduced current amplitude of inverter transistors.

1 cl, 2 dwg