Properties and Synthesis of Lossless Snubbers and Passive Soft-Switching PWM Converters

Yu, Xiang; Su, Jianhui; Guo, Shilin; Zhong, Shaomin; Shi, Yongsheng; Lai, Jidong

doi:10.1109/tpel.2019.2939928

Cited by 24 publications

(9 citation statements)

References 42 publications

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“…Similar to other PWM converters, buck converters have the advantages of simple circuit structure and easy control, yet also have the disadvantage of hard switching; the active switch cannot meet zero-voltage switching on (ZVS), resulting in huge switching losses. In order to solve the problem of hard switching, some soft-switching technologies use active clamping circuits or snubber circuits to enable the active switches to achieve ZVS [ 14 , 15 , 16 , 17 , 18 ]. However, in addition to more complex control, these soft-switching technologies require components such as auxiliary switches, diodes, inductors, and capacitors, resulting in higher product costs.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

et al. 2022

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A novel interleaved DC-DC buck converter is proposed to drive high-brightness light-emitting diodes (LEDs). The circuit configuration mainly consists of two buck converters, which are connected in parallel and use interleaved operation. Through interleaved operation, the power capability of the converter is doubled. Traditionally, two individual inductors are used in the two buck converters. The difference between conventional parallel-operated buck converters using two energy storage inductors and the proposed circuit is that the proposed circuit uses two small inductors and a coupled inductor that replace the two inductors of the buck converters. In this way, both buck converters can be designed to operate in discontinuous-current mode (DCM), even if the magnetizing inductance of the coupled inductor is large. Therefore, the freewheeling diodes can achieve zero-current switching off (ZCS). Applying the principle of conservation of magnetic flux, the magnetizing current is converted between the two windings of the coupled inductor. Because nearly constant magnetizing current continuously flows into the output, the output voltage ripple can be effectively reduced without the use of large-value electrolytic capacitors. In addition, each winding current can drop from positive to negative, and this reverse current can discharge the parasitic capacitor of the active switch to zero volts. In this way, the active switches can operate at zero-voltage switching on (ZVS), leading to low switching losses. A 180 W prototype LED driver was built and tested. Our experimental results show satisfactory performance.

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Section: Introductionmentioning

confidence: 99%

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

et al. 2022

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“…To solve the problems, soft-switching techniques are indispensable and widely adopted in practical applications. Various snubber circuits are designed to decrease the switching loss and mitigate the EMI problems of the electronic devices [16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the corresponding circuits are easier to design, more reliable, and more cost-effective. These advantages make the passive soft switching an attractive approach in various applications [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

An Interleaved Zero-Voltage Zero-Current Switching High Step-Up DC-DC Converter

et al. 2021

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An interleaved zero-voltage zero-current switching (ZVZCS) high step-up DC-DC converter is proposed for modern photovoltaic power generation systems. The proposed converter can achieve high voltage conversion gain without operating under extreme duty cycles. The voltage conversion gain can be readily adjusted by selecting different numbers of the diode-capacitor multiplier (DCM) cells in the circuit at the design stage. Moreover, with the passive snubber circuit in the proposed converter, all power switches and diodes in the DCMs can achieve zero-voltage turn-off and zero-current turn-on, which effectively reduces switching losses and increases the overall converter efficiency. The operational principles and analysis of the performance analysis with two DCMs are presented for demonstrative purpose. The effectiveness of the proposed ZVZCS DC-DC converter is validated using an 800W experimental prototype.INDEX TERMS Interleaved, passive snubber circuit, ZVZCS, high step-up, high efficiency.

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“…The energy captured by the absorption circuit can be transferred to the input side or load side to improve the efficiency. Some lossless passive snubbers have been discussed in DC-DC converters [21]- [23]. But the resonance components of multiple switches may interfere with each other when they are used in inverters.…”

Section: Introductionmentioning

confidence: 99%

A Passive Soft-Switching Snubber With Energy Active Recovery Circuit for PWM Inverters

et al. 2020

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A passive soft-switching snubber with energy active recovery circuit (PSS-EARC) for pulse width modulation (PWM) inverters is proposed in this paper. The PSS-EARC recovers the buffering energy of the snubber inductors and capacitors back to the input voltage source while achieving passive softswitching, so as to improve the inverter efficiency. In this paper, the configuration and operation principle of the PSS-EARC are analyzed and studied in detail firstly. Comparing with the traditional energy passive recovery circuit, the PSS-EARC avoids the circulating current issue by employing the auxiliary switches. Because the control of auxiliary switches is simple and independent, it is also benefit to the integration of auxiliary circuits. Moreover, in three-phase inverter application, the EARC is shared by three bridge-legs, which may further simplify the circuit. Finally, a 10kW three-phase inverter with the PSS-EARC is built. The experimental results demonstrate the validity and superiority of the proposed circuit. INDEX TERMS Energy active recovery, inverter, passive soft-switching, switching loss.

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Properties and Synthesis of Lossless Snubbers and Passive Soft-Switching PWM Converters

Cited by 24 publications

References 42 publications

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature

An Interleaved Zero-Voltage Zero-Current Switching High Step-Up DC-DC Converter

A Passive Soft-Switching Snubber With Energy Active Recovery Circuit for PWM Inverters

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