HIGH-FREQUENCY DC-TO-AC TRANSISTOR CONVERTER INCORPORATING ELECTRONIC PROTECTIVE GEAR Russian patent published in 2005 - IPC

FIELD: power conversion engineering; power supplies for electrical installations.

SUBSTANCE: proposed converter is built around off-line voltage inverter that has transistors 1 through 4, back-to-back diodes 5 through 8, transformer 9, and ac voltage component filter incorporating reactor 10, capacitor 11, additional reactor 12, short-circuiting switch 13, and diode 14, all connected at input of mentioned voltage inverter. Control unit 15 has clock generator 16, scaling device 17, control-current pulse shaper 18, and electrical decoupling device 19. Newly introduced in control unit are inhibit location with memory 20 and critical current sensor 21. With such design of control system generation of pulses driving gates of inverter transistors in conduction ceases upon arrival of logical 1 signal shaped by inhibit location and upon disconnection of clock generator, and input of mentioned voltage inverter is shorted out by short-circuiting switch for time equal to characteristic oscillation period of circuit set up by filter capacitor and additional reactor. Converter is characterized in reduced emergency cutoff transient time and also reduced maximal short-circuit current.

EFFECT: enhanced speed of response of protective gear; elimination of its unwanted operations.

1 cl, 3 dwg