Patent
Power convertor with low loss switching
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TLDR
A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage as discussed by the authors, and a pre-regulator is an SVT (slow voltage transition) and an SCT (slow current transition) switched convertor.Abstract:
A welding power supply includes an input rectifier that receives sinusoidal or alternating line voltage and provides a rectified voltage. A pre-regulator provides a dc bus and a convertor, such as a boost convertor, provides a welding output. The pre-regulator is an SVT (slow voltage transition) and an SCT (slow current transition) switched convertor. It may include a snubber circuit having a diode that is SVT switched. Also, the boost convertor may be SVT and SCT switched. The pre-regulator preferably includes a power factor correction circuit. The power source includes, in one embodiment, an inverter having a snubber circuit having a first switch in anti-parallel with a first diode, and a second switch in anti-parallel with a second diode. The first switch and first diode are connected in series with the second switch and the second diode, and the first and second switches are connected in opposing directions, to form a switched snubber.read more
Citations
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References
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Patent
Zero-voltage-switched multi-resonant converters including the buck and forward type
Wojciech A. Tabisz,Fred C. Lee +1 more
TL;DR: In this article, the authors derived a ZVS-MRC from a PWM converter, where one resonant capacitor is placed in parallel with the active switch, which may be either uni-directional or bidirectional, and an inductor is inserted in the loop containing the switch and the diode.
Proceedings ArticleDOI
State-plane analysis of parallel resonant converter
Ramesh Oruganti,Fred C. Lee +1 more
TL;DR: In this article, a method for analyzing the complex operation of a parallel resonant converter is developed, utilizing graphical stateplane techniques, which uncovers the presence of other complex modes besides the continuous conduction and the discontinuous conduction modes and determines their theoretical boundaries.
Patent
High frequency AC/AC converter with PF correction
Rui Liu,Wen-Jian Gu +1 more
TL;DR: In this article, a high frequency AC/AC converter with power factor correction is described, where a single control circuit controls both parts of the converter apparatus by controlling the switching of the first and second semiconductor switching devices.
Patent
Method And Apparatus For Receiving A Universal Input Voltage In A Welding Power Source
TL;DR: In this article, a method and apparatus for providing a welding current is described, where the power source is capable of receiving any input voltage over a wide range of input voltages and includes an input rectifier that rectifies the ac input into a dc signal.
Patent
Snubber for zero current switched networks
TL;DR: In this article, a coupled saturable inductor is connected to the resonant circuit and the associated switching diode so that the turnoff stress of the switch diode is greatly reduced.