Dual Interleaved Active-Clamp Forward With Automatic Charge Balance Regulation for High Input Voltage Application

Qian, Ting; Lehman, Brad

doi:10.1109/tpel.2007.911796

Cited by 41 publications

(12 citation statements)

References 23 publications

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“…Assuming a fast output-voltage controller and k 1 = k 2 = k, then according to (7), the expression of output-voltage perturbation isv…”

Section: System Stability With the Proposed Wireless Ivs Control mentioning

confidence: 99%

“…Control strategies to achieve IVS and OCS for the ISOP system have been studied extensively [1]- [20], and generally speaking, these control strategies can be classified into two categories, one is the natural voltage/current sharing method in which IVS and OCS are achieved without special control approach, and the other is the method with special IVS control approach. Common-duty-cycle control is usually employed for the natural voltage/current sharing method [2]- [7], which relies on the inherent self-correcting characteristic of the ISOP system when the duty cycles of all the constituent modules are the same. In [8], a control strategy based on sensorless current mode is proposed for the ISOP system with improved input disturbance rejection performance, which has a similar IVS mechanism with that of the common-duty-cycle control.…”

mentioning

confidence: 99%

“…The most significant advantage of the natural voltage/current sharing method is that no special input-voltage or OCS controllers are required and the control strategy is very simple. However, from the point of view of modularity, the ISOP system with the natural voltage/current sharing method has the shortages of low modularity and poor reliability due to the fact that all the constituent modules share the same central controller [2]- [8] and sometimes need to share the transformer [6] or inductor [7]. Moreover, excellent IVS and OCS cannot be achieved due to parameter mismatches among the modules.…”

mentioning

confidence: 99%

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Wireless Input-Voltage-Sharing Control Strategy for Input-Series Output-Parallel (ISOP) System Based on Positive Output-Voltage Gradient Method

Chen

Wang

Ruan

et al. 2014

IEEE Trans. Ind. Electron.

108

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An input-series output-parallel (ISOP) system, in which multiple converter modules are connected in series at the input sides and parallel at the output side, is very suitable for high input-voltage, low output-voltage, and high output-current applications. Input-voltage sharing (IVS) and output-current sharing of the constituent modules among the ISOP system must be ensured. The existing IVS control strategies have drawbacks of lower reliability and lower modularity. In this paper, we propose a wireless IVS control strategy for ISOP systems based on positive output-voltage gradient method, which can effectively improve the reliability and modularity of ISOP systems. First, the operation principle of the proposed control strategy is introduced, and the IVS performance and output-voltage regulation characteristics of ISOP systems are analyzed. The stability of the proposed control strategy is also explored. A three-module ISOP system prototype is fabricated and tested in the laboratory, and the experimental results verify the effectiveness of the proposed control strategy.Index Terms-Input-series output-parallel (ISOP), inputvoltage sharing (IVS), positive output-voltage gradient method, stability, wireless.

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“…Assuming a fast output-voltage controller and k 1 = k 2 = k, then according to (7), the expression of output-voltage perturbation isv…”

Section: System Stability With the Proposed Wireless Ivs Control mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Wireless Input-Voltage-Sharing Control Strategy for Input-Series Output-Parallel (ISOP) System Based on Positive Output-Voltage Gradient Method

Chen

Wang

Ruan

et al. 2014

IEEE Trans. Ind. Electron.

108

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show abstract

“…To solve these problems, forward converters have used several reset schemes. An active-clamp circuit is the most widely used scheme because it does not require an additional reset winding or energy dissipative component to minimize the voltage stress across the MOSFET [1]- [7]. In addition, an active-clamp circuit enables zero-voltage switching (ZVS) in a MOSFET.…”

Section: Introductionmentioning

confidence: 99%

Analysis, Design, and Implementation of a Soft-Switched Active-Clamped Forward Converter with a Current-Doubler Rectifier

Jang¹,

Kim²,

Cho³

2016

Journal of Power Electronics

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This study examines the zero-voltage switching (ZVS) operation of an active-clamped forward converter (ACFC) with a current-doubler rectifier (CDR). The ZVS condition can be obtained with a much smaller leakage inductance compared to that of a conventional ACFC. Due to the significantly reduced leakage inductance, the design is optimized and the circulating loss is reduced. The operation of the ACFC with a CDR is analyzed, and a detailed ZVS analysis is conducted on the basis of a steady-state analysis. From the results, a design consideration for ZVS improvement is presented. Loss analyses of the converters shows that enhanced soft-switching contributes to an efficiency improvement under light-load condition. Experimental results from a 100-W (5-V/20-A) prototype verify that the ACFC with a CDR can attain ZVS across an extended load range of loads and achieve a higher efficiency than conventional ACFCs.

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“…However, the duty cycle of the parallel hybrid forward converter must be less than 0.5 even with the active clamp structure in Fig. 1(a), which limits its application [13]. With the stacked rectifying structure for hybrid forward converters and the active-clamp technique [14], the duty cycle can also be extended to higher than 0.5.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Hybrid Forward Convertor with Series-Parallel Auto-Regulated Transformer Windings and a Common Output Inductor

Wu¹,

Chen²

2013

Journal of Power Electronics

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For conventional interleaved two-phase forward converters with a common output inductor, the maximum duty cycle is 0.5, which limits the voltage range and increases the difficulty of the transformer's optimization. A new two-phase hybrid forward converter with series-parallel auto-regulated transformer windings is presented in this paper. With interleaved control signals for the two phases, the secondary windings of the transformers can work in series when the duty cycle is larger than 0.5, and they can work in parallel when duty cycle is lower than 0.5. Therefore, the maximum duty cycle is extended and the turns ratio of the transformer can be optimized. Duty cycle dependent auto-regulated windings result in the steady states of the converter being different in different duty cycle ranges (D>0.5 and D<0.5). Fortunately, the steady state gains of the proposed hybrid converter are identical at different duty cycle ranges, which means a stepless shift between two states. A prototype is built to verify the theoretical analysis. A conventional control loop is compatible for the whole input voltage range and load range thanks to the stepless shifting between the different duty cycle ranges.

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Dual Interleaved Active-Clamp Forward With Automatic Charge Balance Regulation for High Input Voltage Application

Cited by 41 publications

References 23 publications

Wireless Input-Voltage-Sharing Control Strategy for Input-Series Output-Parallel (ISOP) System Based on Positive Output-Voltage Gradient Method

Wireless Input-Voltage-Sharing Control Strategy for Input-Series Output-Parallel (ISOP) System Based on Positive Output-Voltage Gradient Method

Analysis, Design, and Implementation of a Soft-Switched Active-Clamped Forward Converter with a Current-Doubler Rectifier

Two-Phase Hybrid Forward Convertor with Series-Parallel Auto-Regulated Transformer Windings and a Common Output Inductor

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