FREQUENCY CHANGER Russian patent published in 2000 - IPC

FIELD: converter engineering; power supplies for inductive heaters. SUBSTANCE: frequency changer has three-phase rectifier built around diodes, single-phase inverter using transistors, capacitor, choke coil, regulating transistor, diode, master oscillator, sawtooth-voltage generator, two threshold elements, three output stages, voltage sensor, two filter circuits, two comparison devices, three current sensors, feedback signal selecting circuit, regulating circuit, two signal amplifying circuits, comparator, frequency divider, trigger circuit, two flip-flops, short-pulse shaper, and reference voltage source. EFFECT: improved precision of output voltage regulation. 1 dwg