| 摘要 |
FIELD: electrical and power engineering, transport, various fields of industry and national economy. ^ SUBSTANCE: proposed device used to convert input current energy into output AC power whose frequency and output voltage amplitude are steplessly varied functions to shape sine-wave curve of output voltage across load by alternate and sequential connection of current supply to output leads; DC voltage supply with bipolar output relative to center tap is used for the purpose, alternate and sequential load connection of current supply at output implying that as soon as output current drops to zero, load is connected to output with polarity reverse to that of center tap. To this end power conversion device incorporating load-connected converter with bipolar output relative to center tap is provided with two newly introduced switches whose outputs are integrated by means of cable network and inputs are connected to reverse-polarity terminals of converter, phase-sensing comparator with one input and two outputs, controlled reference sine-voltage generator with two inputs and two outputs, and control unit with two outputs; inputs of controlled reference sine-voltage generator are connected to outputs of control unit with respect to amplitude-control and frequency-control signals; one output of this generator is connected to converter, other one, to input of phase-sensing comparator which is provided with two outputs, each connected to respective switch; load is connected through one lead to cable network interconnecting outputs of both switches and through other lead, to converter center tap. ^ EFFECT: enlarged functional capabilities. ^ 1 cl, 1 dwg |
