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A novel three-phase single-stage boost power factor correction (PFC) converter topology is presented. The converter operates in discontinuous conduction mode (DCM), and the PFC function is realized easily with the peak of input current following input voltage automatically which is the same as that of the traditional single switch three-phase boost PFC. Compared with the single switch three-phase...
At present, the primary methods of realizing AC/AC voltage transformation are frequency transformer, AC-DC-AC converter, matrix converter, high-frequency link AC/AC converters and single-stage AC/AC converters. In areas of high power conversion, taking into account to converter's cost and the quality of output voltage, bridge mode AC/AC converter has some advantages. This converter can realize electrical...
Coupled inductor is one of the main components in power electronics circuits, which plays an important role in DC/DC converters. The leakage inductance of the coupled inductors can be employed to control the diode current falling rate and to alleviate the diode reverse-recovery problem. Then, some soft switching solutions are realized by the coupled inductor to reduce the switching losses. Furthermore,...
To overcome the complicated strategy and circuit implementation issue for control of the conventional ZCS converter to derive the driving signal for the auxiliary switch, a novel ZCT cell which greatly simplifiers the control strategy by directly extending the duty duration to be the whole off-time of the primary switch is proposed in this paper, where the control circuit is implemented only by a...
Active clamped asymmetrical dual switch forward (ACADSF) converter is a preferable candidate standard dc-dc module for high line and wide range input application in low to medium power rating systems. To make the ACADSF be more suitable for practical applications, a novel ACADSF converter was proposed, which, compared with original ACADSF, maintains the advantages that duty cycle can be more than...
This paper proposes a three-phase, two-switch, buck converter that can operate with input power factor correction. The key features of the proposed converter are that a switch in it can operate with almost half the voltage stress of that in the standard three-phase, single-switch buck converter and with less current stress. In the paper, the operation of the converter is discussed and a detailed mathematical...
This paper introduces a digital controller and a segmented power stage that dynamically change mode of operation to maximize power processing efficiency when highly dynamic loads are supplied. The controller operates as a mixed-signal peak current program mode voltage regulator, where a digital current reference is created and used for the efficiency optimization. The losses of the power stage are...
A new ZCS-PWM dc-dc full-bridge boost converter is proposed in the paper. The proposed converter is well-suited to be used as a fuel cell converter where low input voltage / high output voltage conversion is required. In the paper, the operation of the proposed converter is explained in detail, and its features and design are discussed. The feasibility of the converter is confirmed with results that...
In this paper, the general operation principles for the existing control type ZVT PWM dual switch forward converters which possess the same conversion ration are reviewed and their advantages and drawbacks are discussed in detail. Then the control type ZVS techniques of active-clamp and resonant reset are extended to the other dual switch forward converters by whether employing the input for resetting...
In this paper, a novel ZCZVS asymmetrical dual switch forward converter with a ZCS cell is proposed. The proposed active clamp circuit helps primary switches to realize zero-voltage switching and to expend the duty cycle, while the proposed ZCS cell helps to realize zero-current switching on primary switches and the rectifier diode. All the primary semiconductor devices turn on and off under soft...
A study of AC-DC zero-voltage switched (ZVS) pulsewidth modulated (PWM) boost converters with silicon carbide (SiC) boost diodes instead of silicon (Si) boost diodes is presented in the paper. The paper reviews the general principles of active auxiliary circuits that are used to help the main boost power switch turn on with ZVS, then explains how these circuits operate differently when SiC boost diodes...
This paper presented a systematic analysis of the protection methods for paralleled VSCs system especially with common DC bus from four types of internal faults, including short or open circuit faults of single switch or diode. The potential damages of such faults relating to circulating current were first explained. After that internal faults detection and isolation schemes based on de-saturation...
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