From the viewpoint of reliability and practicability, a general design method and the related considerationsfor transistor- inverted welding power supplies are proposed in this paper. The detail contents are composed ...From the viewpoint of reliability and practicability, a general design method and the related considerationsfor transistor- inverted welding power supplies are proposed in this paper. The detail contents are composed of the choice ofinverters, the choice and protection of transistors, the determination of inverting frequency, the design of transformers,and the choice of output rectifiers and rectifying diodes. Besides, a concrete design example of the transistor-invertedpower supply for plasma arc cutting is introduced.展开更多
The full-bridge zero-voltage and zero-current switching inverter, which can adjust the output power by keeping the duty-cycle of lagging arm constant, changing the duty-cycle of leading arm, is a common circuit topolo...The full-bridge zero-voltage and zero-current switching inverter, which can adjust the output power by keeping the duty-cycle of lagging arm constant, changing the duty-cycle of leading arm, is a common circuit topology of soft-switching inverter arc welding power supplies. However, the output power still remains a certain value when the duty-cycle of leading arm decreases to zero. The working-mode of soft-switching inverter and the waveforms of major parameters with the condition of duty-cycle of leading arm being zero are studied in this paper. U-1 characteristic experiments prove that the minimum output power of soft-switching circuit, which depends on the charged voltage of capacitors in parallel with leading arm, can be decreased by reducing the duty-cycle of lagging arm. By switching working-modes between half-bridge and full-bridge, the output power can swing from zero to the power rating.展开更多
文摘From the viewpoint of reliability and practicability, a general design method and the related considerationsfor transistor- inverted welding power supplies are proposed in this paper. The detail contents are composed of the choice ofinverters, the choice and protection of transistors, the determination of inverting frequency, the design of transformers,and the choice of output rectifiers and rectifying diodes. Besides, a concrete design example of the transistor-invertedpower supply for plasma arc cutting is introduced.
文摘The full-bridge zero-voltage and zero-current switching inverter, which can adjust the output power by keeping the duty-cycle of lagging arm constant, changing the duty-cycle of leading arm, is a common circuit topology of soft-switching inverter arc welding power supplies. However, the output power still remains a certain value when the duty-cycle of leading arm decreases to zero. The working-mode of soft-switching inverter and the waveforms of major parameters with the condition of duty-cycle of leading arm being zero are studied in this paper. U-1 characteristic experiments prove that the minimum output power of soft-switching circuit, which depends on the charged voltage of capacitors in parallel with leading arm, can be decreased by reducing the duty-cycle of lagging arm. By switching working-modes between half-bridge and full-bridge, the output power can swing from zero to the power rating.
