Modulated Initial Resonant Current Control Strategy for Extra-&lt;italic&gt;LC&lt;/italic&gt; Auxiliary-Resonant-Snubber-Based Converter to Improve Output Quality in High-Precision Applications

Kou

2019

IEEE Access

Self Cite

The initial resonant current in the extra-LC auxiliary resonant snubber inverter (ELCARSI) is the key parameter to realize soft switching and improve output quality. However, the initial resonant current is related to the filter inductor current. Thus, an extra filter inductor or capacitor current sensor is required, which increases the cost and hardware complexity. Besides, the traditional control strategy using load current to calculate the initial resonant current doesn't require the extra sensor. However, the current stress and output distortion is increased. Thus, an initial resonant current control strategy without filter inductor current sensor is proposed in this paper. The operating principle of ELCARSI is introduced. The output quality and soft switching influenced by the initial resonant current are analyzed. Besides, the proposed sensorless control with estimation of filter inductor current is introduced. A prototype was developed to verify the effectiveness of the control method. The output distortion is close to that of the control with extra sensor. INDEX TERMS Current-sensorless control, soft switching, extra-LC auxiliary resonant snubber inverter.

Section: B Output Quality Influenced By Initial Resonant Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Initial Resonant Current Control for Extra-LC Auxiliary Resonant Snubber Soft-Switching Inverter Without Filter Inductor Current Sensor

Kou

2019

IEEE Access

Self Cite

“…Besides, the distortion caused by the dead‐time effect is reduced than that of hard‐switching converter. The distortions which are caused by the dead‐time effect [13] and semiconductor voltage drop [23] are analyzed and compensated with auxiliary current control. Thus, the ARSI is very suitable for high‐precision applications.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the ZVS inverter as a soft-switching inverter, firstly aims to reduce the switching losses of the semiconductor switches. However, except for the advantage of high efficiency, some ZVS inverters can also eliminate the zero-crossing distortion caused by the dead-time effect [13,14]. Therefore, ZVS inverters can also be used in the high-precision application.…”

Section: Introductionmentioning

confidence: 99%

Clamped Auxiliary Resonant Snubber Soft‐Switching Converter for High‐Precision Applications

IEEJ Transactions Elec Engng

et al. 2022

Self Cite

High dynamic and low output distortion are the key requirements of power converters in high‐precision motion control. The soft‐switching auxiliary resonant snubber inverter (ARSI) has the advantage of low dead‐time effect is very suitable to be used in high‐precision applications. However, the auxiliary switches in ARSI suffer from over‐voltage problem due to the resonance between the junction capacitors of auxiliary switches and resonant inductor. Besides, all switches of natural zero‐voltage switching (‘NZVS+NZVS’ mode) under the light load condition brings about voltage error. Thus, the clamped auxiliary resonant snubber converter (CARSC) is proposed in this paper. Extra diodes are added, which can not only reduce the voltage stress of auxiliary switches but also save the freewheeling energy for the next commutation to improve the efficiency. Moreover, all switches of auxiliary zero‐voltage switching (‘AZVS+AZVS’ mode) is proposed to reduce the voltage error of ‘NZVS+NZVS’. The experimental results demonstrate that the over‐voltage problem is addressed and the loss of the proposed CARSC is reduced. Besides, the high‐precision performance of CARSC is verified. The lowest THD of the output current is 0.015%. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Auxiliary Resonant Snubber‐Based Soft‐Switching Converter with Saturable Inductor to Reduce Reverse Recovery Current and Loss

IEEJ Transactions Elec Engng

et al. 2023

Self Cite

The auxiliary resonant snubber‐based converter (ARSC) has the advantages of low dead‐time effect and low switching loss. However, the auxiliary switches suffer from high reverse recovery loss and high reverse recovery current in high‐switching frequency application. Thus, the ARSC with saturable inductor is proposed to solve the problem above. In this paper, the operating principle of ARSC with saturable inductor is analyzed, and the duty cycle operating range that can realize ZVS in the full load range is deduced. The reverse recovery model of the auxiliary switching device body diode is established to analyze the circuit parameters' influence. Then, the influence of the saturable inductor on the reverse recovery peak current and reverse recovery loss is analyzed. Based on the analysis results, the saturable inductance parameters are designed. Finally, based on the experimental platform of the ARSC, the effectiveness of the proposed method is verified. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.