Time-sharing controlled frequency multiplication of IGBT based 180 kHz/50 kW high frequency induction soldering power supply

In order to increase the inverter of output frequency of an IGBT based, the IGBT current must be enlarged extremely, however, nowaday, the increase of output frequency is limited.Carrying on two groups of inverters by the time-sharing controlled technology may multiply the output frequency of IGBT based inverter.A novel 180 kHz IGBT based high frequency soldering power supply was presented, which applied by frequency multiplication and time-sharing control.The power supply has two paralleled IGBTs in each inverter bridge arm in charged by the time-sharing control, therefore each IGBT operates at half frequency, and the switch loss reduces half too.The inverter operates at double times of each inverter group and achieves at the frequency of 180 kHz.While the load of soldering power of 50 kW in series-resonance conditions, each IGBT operates under the condition of ZCZVS turn-on and ZVS turn-off.Working principles and the parameters of main circuit and the control frames and the experiment waveforms are given.