42-V/3-V Watkins-Johnson converter for automotive use

Darroman, Y.; Ferre, A.

doi:10.1109/tpel.2006.872381

Cited by 22 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the voltage conversion ratio M (D) and the current relationship can be derived in (6) and (7), respectively.…”

Section: Steady-state Characteristicmentioning

confidence: 99%

See 1 more Smart Citation

Improved Watkins-Johnson topology-based inverter with dual low-side switch and synchronous control strategy

Wei

2018

IEICE Electron. Express

View full text Add to dashboard Cite

Abstract:The full-bridge topology is generally used in the post stage of inverter, to realize dc-ac voltage conversion. Inherent shortcomings of full-bridge such as high-side switch driving, prone to shoot-through and substantial power loss are inevitable. A topological solution is proposed in this letter, by means of improving the original coupledinductor Watkins-Johnson topology into dual low-side switch version and conducting synchronous control. Theoretical analysis and experimental results indicate that the improved topology is capable of generating pure sinusoidal ac output. The merits include ease of driving, low power loss, nonpulsating terminal currents, immunity to shoot-through, simple control strategy and so forth.

show abstract

“…Therefore, the voltage conversion ratio M (D) and the current relationship can be derived in (6) and (7), respectively.…”

Section: Steady-state Characteristicmentioning

confidence: 99%

“…Paper [6] employed the WJ topology to dc-dc converter with small conversion ratio for automotive use, however the floating power switch is inevitable. By exchanging the source end and the load end, the inverse Watkins-Johnson (IWJ) topology is derived.…”

Section: Introductionmentioning

confidence: 99%

Improved Watkins-Johnson topology-based inverter with dual low-side switch and synchronous control strategy

Wei

2018

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…Paper [10] claims that the classical buck converter is not applicable for a high step-down ratio (duty cycle < 0.5). Actually, similar issues exist in other aforementioned nonisolated topologies as well.…”

Section: Introductionmentioning

confidence: 99%

Synchronous High Step-Down Ratio Non-Isolated LED Constant Current Driver Based on Improved Watkins-Johnson Topology

Wei

Luo

et al. 2019

IEEE Access

View full text Add to dashboard Cite

In the field of non-isolated light-emitting diode (LED) driver, the omnipresent buck-based LED constant current driver shows poor efficiency in occasions of high step-down ratio due to the marginal operating duty cycle. In order to overcome such drawback and to provide an alternative topological scheme for an LED driver, a Watkins-Johnson topology-based solution is proposed in this paper, by improving the original circuit structure into a dual low-side power switch version and introducing a feedback network for regulating the output current to a constant level. Theoretical analysis, including accurate model construction, steady-state analysis, dynamic analysis, and design consideration, is conducted. Also, an experimental prototype is realized to drive all kinds of LED arrays for acquiring electrical parameters and evaluating performance. The innovative points include invoking the low-side-ize approach to realize the power circuit transformation, and furthermore, the Watkins-Johnson topology is first applied to the constant current power supply. The proposed LED driver holds salient features of low-terminal current ripple, ease of driving, highvoltage conversion ratio tolerance, and inherent energy recovery functionality. The application scope covers low-voltage dc input or automotive lighting use.INDEX TERMS Constant current, LED driver, synchronous control, Watkins-Johnson topology.

show abstract

“…Moreover, it has been shown that by controlling the tapped winding ratio, the switch duty cycle can be extended to a favorable range [22][23][24]. Moreover, it has been shown that by controlling the tapped winding ratio, the switch duty cycle can be extended to a favorable range [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Topologies based on a coupled inductor or tapped inductor (TI) provide better performance than transformer-based topologies. Moreover, it has been shown that by controlling the tapped winding ratio, the switch duty cycle can be extended to a favorable range [22][23][24]. Similar to the transformer topologies, the TI topologies also suffer from a voltage spike across the active switch caused by the leakage inductance between the coupled windings and the switch parasitic capacitance.…”

Section: Introductionmentioning

confidence: 99%

Non‐isolated single‐switch DC–DC converters with extended duty cycle for high step‐down voltage applications

Sabzali

Ismail

Al-Saffar

et al. 2014

Circuit Theory & Apps

View full text Add to dashboard Cite

Several new topologies of single-switch non-isolated DC-DC converters with wide conversion gain and reduced semiconductor voltage stress are proposed in this paper. Most of the proposed topologies are derived from the conventional inverse of SEPIC (Zeta) converter. The proposed topologies can operate with larger switch duty cycles compared with the existing single switch topologies, hence, making them well suitable for high step-down voltage conversion applications. With extended duty cycle, the current stress in the active power switch is reduced, leading to a significant improvement of the system losses. Moreover, the active power switch in some of the proposed topologies is utilized much better compared to the conventional Zeta and quadraticbuck converters. The principle of operation, theoretical analysis, and comparison of circuit performances with other step-down converters are discussed regarding voltage and current stress and switch silicon utilization. Finally, simulation and experimental results for a design example of a 50 W/5 V at 42-V input voltage operating at 50 kHz will be provided to evaluate the performance of the proposed converters.

show abstract

42-V/3-V Watkins-Johnson converter for automotive use

Cited by 22 publications

References 5 publications

Improved Watkins-Johnson topology-based inverter with dual low-side switch and synchronous control strategy

Improved Watkins-Johnson topology-based inverter with dual low-side switch and synchronous control strategy

Synchronous High Step-Down Ratio Non-Isolated LED Constant Current Driver Based on Improved Watkins-Johnson Topology

Non‐isolated single‐switch DC–DC converters with extended duty cycle for high step‐down voltage applications

Contact Info

Product

Resources

About