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This paper presents a new type of cascaded PWM ac-ac converter with phase-shift PWM control. It can reach high output voltage by cascading single-phase units of low voltage rating devices. The proposed converter does not sense current/voltage polarity, and does not require current/voltage sensors and lossy snubbers for commutation, thereby the control complexity can be decreased. It has no shoot-through...
This paper proposes a new type of ac–ac converter which can operate as traditional noninverting buck and boost converters, and inverting buck–boost converter as well. The proposed converter uses six unidirectional current flowing and bidirectional voltage blocking switches, implemented by six reverse blocking insulated-gate bipolar transistors (IGBTs) or series <sc>mosfet</sc>–diode pairs,...
In this paper, double step-down isolated ac-ac converters are proposed. The proposed converters have double step-down function and provides electrical isolation using high frequency transformer. The proposed converters avoid the saturation of transformer by adding a capacitor. In addition, the voltage stress of three bidirectional switches at the primary side of transformer is half of input voltage...
In this paper, buck and boost type AC-AC converters are proposed which are derived from the recently developed switching cell (SC) AC-AC converters. The volume of magnetic components of the SC AC-AC converters is large, and they are also associated with circulating current. The proposed AC-AC converters are free of circulating current and have smaller magnetic volume, therefore they can realize high...
In this paper, a high-frequency isolated buck ac-ac converter is proposed using switching cell structure and coupled inductor, which is immune to damaging of switching devices because of open or short circuit problem. The proposed converter does not require any lossy RC snubber or sensing the input voltage polarity for implementation of dedicated soft commutation strategy, to solve the commutation...
In this paper, a new type of ac-ac converter is proposed which can operate as traditional non-inverting buck and boost converter or inverting buck-boost converter. The proposed converter is immune from shorting of voltage source even when all switches are turned on simultaneously, and therefore, PWM switching dead-times are eliminated to produce high quality output waveform. Owning to the benefit...
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