| 摘要 |
electrical engineering. SUBSTANCE: three- phase thyristor inverter with capacitance commutation may be used for mode of amplitude modulation of output voltage. Standard inverter design does not provide reliable excitation, when output voltage increases from zero to maximal level. Goal of invention is achieved by introduced open contact of commutation device (relay or optical triac), which is located in circuit of an output terminal and is controlled from output of amplifier which inputs are connected to two another two output terminals. This results in possibility of easy excitation of inverter in initial moment, when voltage increases from zero level. Then, when output voltage increases from moment when commutation device is triggered by amplifier, device design provides normal feeding of load by three-phase voltage. EFFECT: increased reliability. 1 dwg |
