Abstract: Apparatus, systems, and/or methods for mitigating audible noise generated by a welding-type power supply are disclosed. In some examples, the switching frequency of the welding-type power supply may be changed to a frequency that is outside the audible range for humans. This strategy takes advantage of the fact that the observed audible noise is generated by vibrating components within the welding-type power supply that vibrate at a frequency related to the switching frequency. Other noise mitigation strategies include dithering and deactivation of portions of the welding-type power supply that vibrate to generate the audible noise.

Abstract: Apparatus, systems, and/or methods for mitigating audible noise generated by a welding-type power supply are disclosed. In some examples, the switching frequency of the welding-type power supply may be changed to a frequency that is outside the audible range for humans. This strategy takes advantage of the fact that the observed audible noise is generated by vibrating components within the welding-type power supply that vibrate at a frequency related to the switching frequency. Other noise mitigation strategies include dithering and deactivation of portions of the welding-type power supply that vibrate to generate the audible noise.

Abstract: A power supply to provide welding or cutting power. The power supply may include an input rectifier to receive an AC input voltage from an input mains and output a rectified DC signal; a PFC/boost block to receive the rectified DC signal and output a boost DC signal having a predetermined voltage independent of the AC input voltage; an inverter to receive the boost DC signal, and output AC power to an output transformer; a PFC controller to control operation of the PFC/boost block; a control block to control operation of the inverter; an internal power supply to receive the rectified DC signal and output a first DC power signal to power the PFC controller, and output a second DC power signal to power the control block.