A nondissipative snubber circuit for high-power GTO inverters

Properties and synthesis of passive lossless soft-switching PWM converters

“…The advantage of transformer coupling is that the ZCL energy transfers each cycle directly to the bus voltage or other voltage storage element in the converter. The forward transformer method has been used for many proposed converters [10][11][12][13][14][15][16][17]. The flyback transformer was suggested in [3].…”

“…Historically, passive soft-switching techniques were used to reduce spikes in the switching circuits and were lossy by dissipating the recovered switching energy in resisters [3]. But more recently, many lossless and partially lossless techniques have been proposed [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

New soft switching techniques for three phase voltage source inverters

“…The purpose of snubbers is to delay the switch current rising to the load level until its voltage has reduced to near zero at turn-on and slow the switch voltage rising to the DC rail until its current reaches zero at turn-o . Many passive lossless snubbers reported in the literature are e ective for both gate turn-o (GTO) thyristors and insulated gate bipolar transistors (IGBTs) in high power inverter applications, but incorporate the complications associated with energy recovery (McMurray 1987, Holtz et al 1989, Qian et al 1997.…”

Composite soft switching configuration for inverters using bridge leg modules

“…Both additional active power devices and passive components are needed in inverters. Snubbers, mainly passive lossless snubbers reported in the literature are effective for both gate turn-off (GTO) thyristors and insulated gate bipolar transistors (IGBTs) in high power inverter applications [4][5][6][7][8]. They can increase the efficiency of industrial power equipment at high switching frequencies, but have complicate energy recovery configurations.…”