scholarly journals Unified Models for Multiphase Coupled Inductors

2020 ◽  
Author(s):  
Minjie Chen ◽  
Charles Sullivan
Keyword(s):  
Magnetic Circuit ◽  
Buck Converters ◽  
Spice Simulation ◽  
Theoretical Derivation ◽  
Magnetic Structures ◽  
Coupled Inductors ◽  
Coupled Structures ◽  
Circuit Duality ◽  
Dual Models ◽  
Current Ripple

<div> <p>Circuit models for multiphase coupled inductors are summarized, compared, and unified. Multiwinding magnetic structures are classified into parallel-coupled structures and series-coupled structures. For parallel-coupled structures used for multiphase inductors, the relationships between a) inductance matrix models, b) extended cantilever models, c) magnetic circuit models, d) multiwinding transformer models, e) gyrator-capacitor models, and f) inductance dual models are examined and discussed. These models represent identical physical relationships in the multiphase coupled inductors, but emphasize different physical aspects and offer distinct design insights. The circuit duality between the series coupled structure and the parallel coupled structure is explored. Design equations arising from these models are streamlined and summarized, and a simplified equation showing the relationships between current ripple for interleaved multiphase buck converters with and without coupling is presented. The models and design equations are verified through theoretical derivation, SPICE simulation, and experimental measurements. <br></p></div>

scholarly journals Unified Models for Multiphase Coupled Inductors

2020 ◽  
Author(s):  
Minjie Chen ◽  
Charles Sullivan
Keyword(s):  
Magnetic Circuit ◽  
Buck Converters ◽  
Spice Simulation ◽  
Theoretical Derivation ◽  
Magnetic Structures ◽  
Coupled Inductors ◽  
Coupled Structures ◽  
Circuit Duality ◽  
Dual Models ◽  
Current Ripple

<div> <p>Circuit models for multiphase coupled inductors are summarized, compared, and unified. Multiwinding magnetic structures are classified into parallel-coupled structures and series-coupled structures. For parallel-coupled structures used for multiphase inductors, the relationships between a) inductance matrix models, b) extended cantilever models, c) magnetic circuit models, d) multiwinding transformer models, e) gyrator-capacitor models, and f) inductance dual models are examined and discussed. These models represent identical physical relationships in the multiphase coupled inductors, but emphasize different physical aspects and offer distinct design insights. The circuit duality between the series coupled structure and the parallel coupled structure is explored. Design equations arising from these models are streamlined and summarized, and a simplified equation showing the relationships between current ripple for interleaved multiphase buck converters with and without coupling is presented. The models and design equations are verified through theoretical derivation, SPICE simulation, and experimental measurements. <br></p></div>

scholarly journals Unified Models for Coupled Inductors Applied to Multiphase PWM Converters

2021 ◽  
Author(s):  
Minjie Chen ◽  
Charles R. Sullivan
Keyword(s):  
Magnetic Circuit ◽  
Buck Converters ◽  
Spice Simulation ◽  
Theoretical Derivation ◽  
Magnetic Structures ◽  
Coupled Inductors ◽  
Coupled Structures ◽  
Circuit Duality ◽  
Dual Models ◽  
Current Ripple

<div> <p>Circuit models for multiphase coupled inductors are summarized, compared, and unified. Multiwinding magnetic structures are classified into parallel-coupled structures and series-coupled structures. For parallel-coupled structures used for multiphase inductors, the relationships between a) inductance-matrix models, b) extended cantilever models, c) magnetic-circuit models, d) multiwinding transformer models, e) gyrator-capacitor models, and f) inductance-dual models are examined and discussed. These models represent identical physical relationships in the multiphase coupled inductors, but emphasize different physical aspects and offer distinct design insights. The circuit duality between the series-coupled structure and the parallel-coupled structure is explored. Design equations for interleaved multiphase buck converters based on these models are streamlined and summarized, and a simplified equation showing the relationships between current ripple with and without coupling is presented. The models and design equations are verified through theoretical derivation, SPICE simulation, and experimental measurements. <br></p></div>

scholarly journals Unified Models for Multiphase Coupled Inductors

2020 ◽  
Author(s):  
Minjie Chen
Keyword(s):  
Matrix Models ◽  
Magnetic Circuit ◽  
Experimental Measurements ◽  
Spice Simulation ◽  
Theoretical Derivation ◽  
Magnetic Structures ◽  
Coupled Inductors ◽  
Coupled Structures ◽  
Circuit Duality ◽  
Dual Models

<div> <div> <p>Circuit models for multiphase coupled inductors</p><p>are summarized, compared, and unified. Multiwinding magnetic structures are classified into parallel-coupled structures and series-coupled structures. For parallel-coupled structures used for multiphase inductors, the relationships between a) inductance matrix models, b) extended cantilever models, c) magnetic circuit models, d) multiwinding transformer models, e) gyrator-capacitor models, and f) inductance dual models are investigated and</p><p>discussed. These models represent identical physical relationships in the multiphase coupled inductors, but emphasize different physical aspects and offer distinct design insights. The circuit duality between the series coupled structure and the parallel coupled structure is revealed. Design equations linking these models are compared and unified. The models and design equations are verified through theoretical derivation, SPICE simulation, and experimental measurements.</p></div></div>

scholarly journals Unified Models for Multiphase Coupled Inductors

2020 ◽  
Author(s):  
Minjie Chen
Keyword(s):  
Matrix Model ◽  
Circuit Model ◽  
Experimental Measurements ◽  
Dual Model ◽  
Spice Simulation ◽  
Theoretical Derivation ◽  
Coupled Inductors ◽  
Transformer Model ◽  
Circuit Duality ◽  
Model C

<div> <div> <div> <p>Circuit models for multiwinding coupled magnetics are summarized, compared, and unified. Multiwinding coupled magnetics are classified into parallel coupled structure and series coupled structure. For parallel coupled structure, the relation- ships between a) inductance matrix model, b) extended cantilever model, c) magentic circuit model, d) multiwinding transformer model, e) gyrator-capacitor model, and f) inductance dual model are investigated and discussed. These models represent identical physical relationships in the multiphase coupled magnetics, but show different fundamental principles and offer distinct design insights. The circuit duality between the series coupled structure and parallel coupled structure is revealed. Design equations linking these models are compared and unified. The models and design equations are verified through theoretical derivation, SPICE simulation, and experimental measurements.</p></div></div></div>

scholarly journals On Ripple Reduction of PWM Coupled Inductors

2021 ◽  
Author(s):  
Minjie Chen
Keyword(s):  
Coupling Coefficient ◽  
Reduction Ratio ◽  
Pwm Converters ◽  
Coupled Inductors ◽  
Reduction Mechanisms ◽  
Ripple Reduction ◽  
Circuit Duality ◽  
First Time

<div>This letter investigates the ripple reduction mechanisms of pulsed-width-modulated (PWM) coupled inductors based on the principles of multiphase interleaving. By adopting circuit duality and superposition analysis, the ripple reduction ratio of PWM coupled inductors is, for the first time, presented as a function of the ripple reduction ratio of multiphase interleaving and the coupling coefficient of the coupled inductor. The analysis simplifies the assumptions used in previous study, and results in concise and intuitive description of the ripple reduction mechanisms of coupled inductors. The results provide useful guidelines for designing interleaved and coupled PWM converters.</div>

NONISOLATED MULTIPHASE HALF-BRIDGE-BUCK TOPOLOGY WITH INHERENT CURRENT SHARING CAPABILITY AND SOFT-SWITCHING AND COUPLED-INDUCTORS CURRENT-DOUBLER

2004 ◽  
Vol 13 (03) ◽  
pp. 443-466
Author(s):  
JABER A. ABU-QAHOUQ ◽  
HONG MAO ◽  
ISSA BATARSEH
Keyword(s):  
Duty Cycle ◽  
High Performance ◽  
Dynamic Performance ◽  
Soft Switching ◽  
Coupled Inductors ◽  
Current Sharing ◽  
Highly Sensitive ◽  
High Dynamic ◽  
Step Down ◽  
Current Ripple

Point-of-load DC–DC converter requirements and design are increasingly becoming stricter than ever. This is due to the required tight dynamic tolerances allowed for supply voltages and high dynamic performance demand coupled with very high power density. Moreover, as the required converter output voltage becomes smaller, higher voltage step-down ratio is required, which results in smaller switching duty cycle in the nonisolated topologies. Step-down transformer with large turns ratio is used in the isolated topologies to step-down the voltage and keep larger duty cycle. Most of the nonisolated DC–DC topologies are buck-derived and unfortunately work at hard-switching which degrades the efficiency. DC–DC interleaved buck topologies were proposed but are highly sensitive to interleaved phases asymmetry and require high performance current sharing loop. In this paper, a nonisolated multiphase nonisolated half-bridge-buck topology is presented. This topology makes it possible to achieve soft-switching, works at larger switching duty cycle with lower output voltages, and does not require current sharing loop because of the inherent current sharing capability. Moreover, a coupled-inductor current doubler topology is also presented in this paper allowing higher step-down ratio and lower output current ripple. Theoretical analysis and experimental results are presented.

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