Frequency Converter With the Reduced THD of the Output Voltage

Pavlov, Gennadiy; Vinnychenko, Iryna; Obrubov, Andrey

doi:10.15407/techned2016.05.014

Cited by 2 publications

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“…9 are recommended for use when the values of the Q factor of the circuit are within Q=2...10. The established theoretical dependences of the operating frequency (10) to (13) have an acceptable accuracy for engineering calculations for Q=5 or more Q factors. For a more accurate theoretical determination of the dependences of self-generation frequencies at low Q factor of the circuit (Q<5), it is advisable to use the method of superimposing the components of the circuit current [17], applicable for studying the parameters of stationary processes in the resonant inverter circuit.…”

Section: Discussion Of Results Of Studying the Self-generating Resona...mentioning

confidence: 92%

“…When the circuit becomes similar to an aperiodic link, the shape of the oscillations approaches exponential waves. However, the above theoretical data (10) to (13) were obtained for the first harmonics of oscillations. That is, they are valid for the sinusoidal shape and can allow for errors when deviating the shape of the inverter voltage from the sine wave.…”

Section: Discussion Of Results Of Studying the Self-generating Resona...mentioning

confidence: 97%

“…1, a) is carried out using an autonomous controlled oscillation generator (MO), in which parameters such as frequency, duty cycle, number of pulses can be adjusted. Converters with independent excitation of oscillations are described in [13,14]. In the control system of the converter with independent excitation of oscillations, it is necessary to provide for such characteristics of the conversion frequency control so that the desired valve switching conditions are observed throughout the control range [12,15,16].…”

Section: Classification Of Methods Of Excitation Of Oscillations In T...mentioning

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: Discussion Of Results Of Studying the Self-generating Resona...mentioning

confidence: 92%

Section: Discussion Of Results Of Studying the Self-generating Resona...mentioning

confidence: 97%

Section: Classification Of Methods Of Excitation Of Oscillations In T...mentioning

confidence: 99%

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Optimizing the operation of charging self-generating resonant inverters

Pavlov

Obrubov

Vinnychenko

2022

EEJET

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Adaptive Control System of the Frequency Converter on the Basis of Resonant Inverter With Nonlinear Control

Pavlov¹,

Vinnychenko²,

Pokrovskiy³

2018

Teh. Elektrodin.

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The adaptive microprocessor control system of the frequency converter based on the resonant inverter is developed, which allows, by implementing of the soft switching of power transistors, forming the low-frequency sinusoidal output voltage with low THD and, extending the operating range of the load characteristics of the converter due to the adaptive regulation. The corrected value of the relative output voltage, which is considered during the formation of the control pulses sequence, which goes to the key elements of the circuit, during the escape from the 1 / 3 2018 n 5 s8 operating range of the load characteristics of the converter, is determined. References 8, figures 3.

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Frequency Converter With the Reduced THD of the Output Voltage

Cited by 2 publications

References 0 publications

Optimizing the operation of charging self-generating resonant inverters

Optimizing the operation of charging self-generating resonant inverters

Adaptive Control System of the Frequency Converter on the Basis of Resonant Inverter With Nonlinear Control

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