Dynamic Model of Class-E Inverter With Multifrequency Averaged Analysis

Bernal, Carlos; Oyarbide, E.; Gaudó, Pilar Molina; Mediano, Arturo

doi:10.1109/tie.2012.2185012

Cited by 25 publications

(7 citation statements)

References 29 publications

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“…On the other hand, capacitor C P ensures a small dv/dt across transistor Q during the turn-off transient thus reducing the switch-off losses. This behavior is also found in the standard Class-E inverter configuration, allowing these circuits to be used at very high frequencies [23].…”

Section: Circuit Operationmentioning

confidence: 72%

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

et al. 2019

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The strict restrictions imposed both by mandatory regulations and by the recommendations contained in current standards have led to the fact that most commercially available LED ballasts nowadays use two-stage topologies. The first stage is intended to comply with the harmonics standards and the second stage is used to control the LED current and reduce the low frequency ripple. In this work, a new DC-DC resonant converter topology is presented. This topology is derived from a modified Class-E resonant inverter by adding a clamping diode. This diode achieves a double goal: it limits the maximum switch voltage and works as a power recirculating path. This way, the proposed topology behaves as a loss-less impedance placed in series with the LED thus allowing to control the output power. This converter maintains the extremely small switching losses inherent to the Class-E inverter while reducing the voltage stress across the switch. This work presents a simplified design methodology based on the fundamental approach. This methodology was used to design and build a DC-DC post-regulator for a 40 W LED lamp. The results obtained with the laboratory prototype show that this circuit can be used to stabilize and dim the LED current while maintaining very small losses. The measured efficiency was 95.7% at nominal power and above 90% when dimmed down to 25%.

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Section: Circuit Operationmentioning

confidence: 72%

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

et al. 2019

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“…The most commonly used technique to analyze the dynamic behavior of a resonant converter is the Multifrequency Averaging (MFA) technique [20][21][22]. This method is used when the high frequency current ripple in the converter inductors or the voltage ripple in the capacitors are too high to be neglected as they are in the traditional averaging procedure [23].…”

Section: Introductionmentioning

confidence: 99%

“…Normally, for resonant converters, the MFA analysis is applied only to the DC and fundamental components and higher order harmonics are neglected. Typically, the nonlinear elements of the circuit are analyzed using the describing function [21]. This procedure provides a fairly complicated model where in most cases, obtaining the converter transfer function cannot be made in a straightforward way.…”

Section: Introductionmentioning

confidence: 99%

Closed Loop Control of a Series Class-E Voltage-Clamped Resonant Converter for LED Supply with Dimming Capability

et al. 2019

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In this work, a new closed-loop control system is applied to a class-E resonant DC-DC converter with voltage clamp used for light-emitting diode (LED) supply. The proposed power topology was first described by Ribas et al. in a recent work. In the present paper, the LED current is sensed and used to implement a feedback control loop instead of the simplified feedforward scheme used in this previous reference. To design the control, a novel, simplified small-signal model is presented. This model is used to analyze the converter behavior as a function of the output power. The proposed approximation is significantly simpler than the multifrequency averaging technique normally used to analyze resonant converters. The feedback control loop is designed to reduce the LED low frequency current ripple while providing dimming control. Both the model and the control are verified by simulation and laboratory experimentation and the results obtained are in good accordance with the expected values.

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“…1(c). A single-switch resonant inverter topology is proposed in [14] to use LC resonance for AC signal generation.…”

Section: Introductionmentioning

confidence: 99%

High frequency inverter topologies integrated with the coupled inductor bridge arm

Hu¹,

Ji²,

Finney

et al. 2016

IET Power Electronics

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-A new topology of the high frequency AC (HFAC) inverter bridge arm is proposed which comprises a coupled inductor, a switching device and an active clamp circuit. Based on it, new single-phase and three-phase inverters are proposed and their operating states are analyzed along with the traditional H-bridge inverter.Multi-phase and multi-level isolated inverters are also developed using the HFAC bridge arm. Furthermore, based on the proposed HFAC, a frond-end DC-DC converter is also developed for photovoltaic (PV) systems to demonstrate the application of the proposed HFAC converter. Simulation and experimental results from prototype converters are carried out to validate the proposed topologies which can be utilized widely in high frequency power conversion applications such as induction heating and wireless power transfer.

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Dynamic Model of Class-E Inverter With Multifrequency Averaged Analysis

Cited by 25 publications

References 29 publications

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

Closed Loop Control of a Series Class-E Voltage-Clamped Resonant Converter for LED Supply with Dimming Capability

High frequency inverter topologies integrated with the coupled inductor bridge arm

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