Self-Oscillating DC-DC Resonant Converter

Cortes-Rodriguez, J.; Ponce-Silva, Mario

doi:10.1109/cerma.2012.56

Cited by 5 publications

(11 citation statements)

References 17 publications

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“…In this sense, an alternative is autogenerator circuits of converters that maintain oscillations using signals of their own power circuit [8][9][10]. They have a significant advantage for resonant convertersthe relationship of the operating frequency of self-generation with the parameters of the circuit and, as a result, the automatic change in the operating frequency and the maintenance of the mode of resonance compensation of unstable leakage inductances.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The implementation of these advantages in non-contact chargers requires the development of special circuit solutions that replace the integrated transformer, compatible with the inductor system. For example, work [10] implemented an original circuit solution of positive feedback with a separate low-power resonance system, which is similar in properties to the power resonance system. Owing to this separation, the stability of self-generation increases, but the self-adjustability of the inverter decreases when leakage inductances change in the power resonance system.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Optimizing the operation of charging self-generating resonant inverters

Pavlov

Obrubov

Vinnychenko

2022

EEJET

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This paper reports a study of the electromagnetic processes in self-generating resonant inverters, as well as the derivation of analytical dependences of their operating frequency on the parameters of the resonance circuit and positive feedback circuits, in order to expand the range of their output power and optimize their operation. The object of research is electromagnetic processes in resonant inverters, in which autogeneration of resonant current oscillations is carried out in the process of operation. The results of studying the electromagnetic processes in sequential self-generating resonant inverters based on the characteristics of the resonant circuit are presented. The operating modes of the inverters have been optimized by setting certain ratios between the operating and resonant frequencies at unstable circuit parameters. The ratio of operating and resonant frequencies is set through the use of phase-shifting filters in a positive feedback loop along the circuit current and correspond to the autogenerator mode. The conditions of self-generation in converters with a sequential resonant circuit have been determined. Mathematical expressions have been built for determining the coefficients of positive feedback on the current and voltage of the resonant circuit, which made it possible to derive target analytical dependences. Analytical dependences of the established operating frequency on the parameters of the circuit and phase-shifting filters have been established. Based on the obtained dependences, the parameters of the positive feedback circuits have been determined in order to ensure a wide range of output power of the converters. The resulting dependences make it possible to carry out theoretical calculations whose results repeat the results of model experiments. Phase characteristics of the resonance circuit and various phase-shifting filters, which can be part of a serial resonant converter, have been constructed. The results of the analysis reported here could be used in the design of resonant inverters with unstable circuit parameters, in particular in inductive chargers.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Optimizing the operation of charging self-generating resonant inverters

Pavlov

Obrubov

Vinnychenko

2022

EEJET

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Section: Introductionmentioning

confidence: 99%

“…Scattered in the literature, this mode has been attained by means of different techniques [2][3][4][5][6][7][8][9][10][11][12][13][14][15], all having in common the change of the input voltage polarity induced by the internal state of the resonant converter. Some of these papers made contributions in the realization of the controller, detailing the driving circuits for self-oscillation [2,4,[11][12][13][14][15]. Others focused on the dynamics: using graphical methods in state-plane or in the frequency response plots [3,4,6], with the describing function method [5,7,10], the Hamel locus [9], and/or showing small-signal models [5,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Self-Oscillating Resonant Converters with Loss-Free Resistor Characteristics

et al. 2020

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A general approach for the analysis and design of self-oscillating resonant converters is presented in this paper, for a particular class of circuits in which the change of input voltage polarity is caused by the zero-crossings of the input inductor current. The key features of the method are an analytical description in the time-domain of a spiral that eventually converges into an ellipse, and a frequency–domain analysis that explains the behavior of the ellipse as a limit cycle. On a theoretical basis, this class of circuits behaves as loss-free resistors (LFR) because in steady-state the input inductor current is in phase with the first harmonic of the input voltage. The proposed analytical procedure predicts accurately the amplitude and frequency of the limit cycle and justifies the stability of its generation. This accuracy is reflected in the close agreement between the theoretical expressions and the corresponding simulated and measured waveforms. Third and fourth order resonant converters are designed following simple guidelines derived from the theoretical analysis.

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“…However, the overall delay in the TX, composed of the inherent delay of the switching tubes, comparators and drivers in the feedback loop, may be up to several hundred nanoseconds. The delay is often ignored in the applications with low frequency and quality factor such as electronic ballasts [9–13] and resonant inverters [14–16] because it cause little detuning. However, for the applications with high frequency (>100 kHz) and quality factor (>100), the delay leads to severe frequency‐detuning.…”

Section: Introductionmentioning

confidence: 99%

Tuning of mid‐range wireless power transfer system based on delay‐iteration method

Ren

Yang

et al. 2016

IET Power Electronics

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The practical mid-range wireless power transfer (WPT) system with high-quality resonant tanks is detuned easily due to the variation in parameters of the resonant tanks, leading to degradation of power transfer capability. For this reason, the frequency variation of the mid-range serial-serial (SS) topology WPT system under the condition of self-oscillation is analysed based on Hamel locus approach, considering the delays in devices. The delay-iteration method (DIM) to tune the transmitter (TX) is presented here. Use of this method can keep the overall TX delay equal to the self-oscillating cycle and the TX in the zero voltage switching state. When the DIM is applied, the disturbance observation method can be used to tune the capacitor of the TX, with no communication between the TX and the receiver. The experiment results validate the accuracy and stability of tuning mid-range loose-coupling WPT system using the proposed method.

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Self-Oscillating DC-DC Resonant Converter

Cited by 5 publications

References 17 publications

Optimizing the operation of charging self-generating resonant inverters

Optimizing the operation of charging self-generating resonant inverters

Analysis and Design of Self-Oscillating Resonant Converters with Loss-Free Resistor Characteristics

Tuning of mid‐range wireless power transfer system based on delay‐iteration method

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