DC Link Snubber Research Articles

Heterogeneous Integration of Silicon-Based RC Snubber in SiC Power Module for Parasitic Oscillation Noise Reduction

Due to the increased switching speed and reduced device capacitance, the parasitic oscillation of the switching device has become the primary high-frequency EMI noise source in SiC converters. The DC-link snubber offers a potential to mitigate the noise in a cost-efficient way. However, the temperature limits and thermal de-ratings of the existing ceramic capacitor hinder the exploration of module-level integration. In this work, a silicon-based <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RC</i> snubber is designed to fit the working temperature of the power module. With the developed four-order damping and thermal coupling models, the iterative method is proposed to optimize the integration performance. The experiments validate the temperature stability of the integrated snubber. With the aid of the proposed <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RC</i> snubber, the EMI noise induced by the parasitic oscillation in the prototype module is reduced by 7 to 22 dB compared with the non-snubber module with ceramic decouplers.

Soft Switching Inverter with An Auxiliary Active Quasi-Resonant DC Link Snubber for AC Servo Motor Drive

This paper presents a simple circuit topology of the auxiliary active quasi-resonant DC link snubber-assisted three phase voltage source soft-switching inverter for small scale PM motor drive applications. The pulse processing drive circuit interface and its soft-switching operation are discussed from an experimental point of view. Moreover, its conductive noise is measured and evaluated for electrical AC servo motor drive as compared with that of the conventional hard switching inverter.

High Efficient Low Noise Three Phase Voltage-Fed Soft-Switching Double PWM Converter System with A Single Resonant DC Link Snubber

This paper presents a novel system prototype of auxiliary resonant DC link (ARDCL) assisted three phase double converter using IGBT power modules. In the ARDCL-based double converter, large current flows through the ARDCL circuit when the ARDCL circuit operates under heavier load current ranges. In addition to this, the gate pulse control timing sequences for switching power semiconductor devices used in the ARDCL circuit become more complicate actually.The active auxiliary resonant DC link snubber circuit has advantage point of small load currents which flow through the ARDCL circuit and does not actually require the complicated timing pulse control implementation for switching power semiconductor devices. In this paper, the system configuration double converter circuit and its operation principle are described for three phase voltage source type double soft-switching converter with a single ARDCL snubber. For a 10kVA prototype double converter system, conversion efficiency can be improved in addition to noise terminal voltage is reduced up to 20dBuV in maximum in the switching frequency range of 500kHz or more in comparison with the conventional three phase hard switching double converter system.

Feasible enhancement of a three‐phase soft‐switching inverter with an auxiliary resonant DC link snubber

AbstractThe purpose of this paper is to improve power conversion efficiency of a three‐phase voltage source type soft‐switching inverter with a single auxiliary resonant DC link (ARDCL) snubber. First, the operating principle of an ARDCL snubber discussed here is described. Second, this paper proposes an effective pulse pattern generation method of the zero voltage space vector of the three‐phase soft‐switching inverter using IGBTs or power modules that can reduce power losses in the ARDCL snubber treated here. In particular, a zero voltage holding interval in the DC rail busline of this three‐phase soft‐switching inverter is to be regulated according to the generation method of the zero voltage space vector. Third, the maximum modulation depth Mmax under the condition of correction of the instantaneous voltage space vector can be improved by using a new zero voltage space vector generation method. Finally, the feasible experimental results of this inverter are obtained confirming the operating characteristics such as power conversion actual efficiency, as well as conventional efficiency THD and RMS value of the balanced three‐phase output voltage for an experimentally built three‐phase voltage source type soft‐switching pulse modulated inverter using the latest IGBT modules and evaluated from the standpoint of practical applications in industry UPS and new energy systems. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 146(1): 89–99, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10234

Effective Improvement of DC Busline Voltage Utilization Factor in Two Switch-Auxiliary Quasi-Resonant DC Link Snubber Assisted Three Phase Voltage Source Type Soft-Switching PWM Inverter

In recent years, a resonant snubber to minimize switching power losses and EMI noises have attracted special interest for the voltage-fed soft switching sinewave PWM inverters and active rectifiers. The authors have discussed the performance evaluations on lower noise and high efficiency for two switch auxiliary resonant DC link snubber assisted three-phase voltage-fed soft switching PWM inverter. It was proved that cost effective three phase soft switching inverter treated here is able to improve both efficiency and EMI noise. However, some practical problems to be improved have recognized for the soft-switching three phase PWM inverter treated here from a practical point of view. This three phase soft-switching inverter with two switch type auxiliary resonant DC link snubber has significant disadvantages of DC busline link voltage reduction for the existence of the zero voltage mode transition period as well as the larger size and physical volume of electrolytic capacitor incorporated into the resonant DC link snubber. The additional technology to minimize the busline DC link zero voltage period in order to overcome the practical problems mentioned above is newly proposed in this paper. From experimental and simulation viewpoints, the modified version of this soft-switching inverter is discussed and evaluated for the DC busline voltage utilization factor as compared with the previously developed one.

Practical Active Auxiliary Resonant DC Link Snubber with A Single Diode Clamping Loop for Suppressing Its ZCS Related Switch Parasitic High Frequency Oscillation

A practical active auxiliary quasi-resonant dc link snubber circuit with a diode clamping loop to reduce the switching losses and suppress a voltage ringing which causes in the loop including auxiliary zero current switching device; IGBT with parasitic electrostatic capacity is evaluated experimentally.

Feasible Enhancement of Three-Phase Soft-Switching Inverter with An Auxiliary Resonant DC Link Snubber

The purpose of this paper is to improve power conversion efficiency of three-phase voltage-source type soft-switching inverter with a single auxiliary resonant DC link (ARDCL) snubber. In the first place, the operating principle of an ARDCL snubber discussed here is described. In the second place, this paper proposes an effective generation scheme of zero voltage space vector of three-phase soft-switching inverter using IGBTs that can reduce power losses in the ARDCL snubber treated here. In particular, a zero voltage holding interval in the DC busline of this soft switching inverter is to be regulated due to, the generation scheme of zero voltage space vector. In the third place, the maximum modulation depth Mmax under the condition of compensation of space voltage space vector can be improved by using a new zero voltage space vector generation scheme. Finally, the feasible experimental results to confirm the operating characteristics such as power conversion efficiency, THD and RMS value of output voltage for three-phase voltage-source type soft-switching inverter using IGBTs is concretely implemented and evaluated from a practical point of view.

Auxiliary resonant DC link snubber assisted voltage-source soft switching inverter with space zero voltage vector generation method

The aim of the work is to improve the power conversion efficiency of a voltage-source three-phase inverter with a single active auxiliary resonant DC link snubber circuit (ARDCL). The operating principle and salient features of the ARDCL snubber circuit are described. An effective space voltage vector generation method is of proposed zero voltage vector of a three-phase soft-switching inverter, which can reduce power losses in the ARDCL snubber circuit. The zero voltage holding interval in the DC bus-line of the three-phase inverter is controlled due to the generation method of the zero voltage vector. The feasible experimental results confirm the relationship between the inverter power conversion efficiency and the proposed zero voltage vector generation method is concretely implemented and evaluated from a practical point of view.

Feasible Evaluations of 3-Level 3-Phase Voltage-Fed Soft-Switching Inverter with Two Active Resonant Snubbers

This paper presents a novel type of 3-level 3-phase voltage-fed soft switching inverter with two new Auxiliary Resonant DC Link (ARDCL) snubbers topologies which can operate under a condition of Zero Voltage Switching (ZVS). The feasible operating performances of the proposed soft switching inverter using IGBT module which is more suitable for power systems applications is evaluated on the basis of its experimental results.

Evaluations of voltage-source soft-switching inverter with single auxiliary resonant snubber

A novel prototype of auxiliary resonant DC link (ARDCL) snubber is proposed. The paper also describes a three-phase space voltage vector modulated sinewave soft-switching inverter using the proposed ARDCL snubber circuit, which together with new voltage vector correction principle can produce high-performance output voltage waveforms. The output voltage waveforms obtained by the software processing of the inverter are able to achieve a high quality sinewave on the basis of the new correction principle. The effectiveness of the resonant DC link three-phase voltage source soft-switching inverter is proven from a practical point of view.

Performance Improvement of Voltage-Fed Three Phase Soft Switching Inverter with a New Resonant DC Link Snubber

This paper presents a voltage source soft switching space voltage vector modulated inverter which incorporates two types of soft commutations; lossless snubber capacitor single operating scheme and active auxiliary resonant DC link snubber scheme. The operating principle of soft commutation is described. In addition, the effectiveness of its improved soft switching scheme is proven on the basis of simulation data.

A novel three-phase, current-fed ZCS-PWM converter incorporating a single resonant DC link soft commutation snubber

This paper presents a novel prototype three-phase current-fed PWM converter with a switched-capacitor-type resonant DC link commutation circuit operating with a new optimum PWM pattern strategy, designed with consideration for a low-pass filter. This converter can operate based on the principle of zero current soft-switching commutation. First, the steady-state operating principle of this converter with a new resonant DC link snubber circuit is described in relation to an equivalent operating circuit, together with the practical design procedure of the switched-capacitor-type resonant DC link circuit. Second, the three-phase current-fed PWM converter with the switched-capacitor-type resonant DC link circuit is discussed from a theoretical viewpoint based on a design example. An actively delayed time correction method to compensate distorted currents due to a relatively long resonant commutation time is newly implemented in the open-loop control scheme so as to obtain a new optimum PWM pattern. Finally, an experimental setup of this converter is demonstrated in a laboratory to confirm the zero current soft-switching commutation of this converter. Comparative evaluations between current-fed hard-switching PWM and soft-switching PWM converters are implemented from the viewpoint of PWM converter characteristics. © 2000 Scripta Technica, Electr Eng Jpn, 132(3): 57–67, 2000

New conceptual three-phase current-fed soft switching pulse width modulation converter with switched capacitor type resonant dc link

This paper presents a novel prototype of three-phase current-fed PWM converter with a switched capacitor type resonant dc link snubber circuit, which can basically operate under a principle of zero current soft switching commutation. The optimum PWM pattern-based control scheme proposed by the authors is effectively applied for this active converter. In this paper, the steady-state operating principle of a new converter circuit treated here is described. The practical design procedure of this converter is discussed from a theoretical point of view. The feasible experiment to confirm zero current soft switching commutation of this converter is concretely implemented and evaluated herein.

A Novel Three-Phase Current-Fed ZCS-PWM Converter Incorporating A Single Resonant DC Link Soft Commutation Snubber

This paper presents a novel prototype three-phase current-fed PWM converter with switched-capacitor type resonant DC link commutation circuit operating with a new optimum PWM pattern strategy under a design consideration of low-pass filter, which can operate on the basis of the principle of zero current soft-switching commutation.In the first place, the steady-state operating principle of this converter with a new resonant DC link snubber circuit is described in connection with the equivalent operating circuit, together with the practical design procedure of the switched-capacitor type resonant DC link circuit. In the second place, the three-phase current-fed PWM converter with the switched-capacitor type resonant DC link circuit is discussed from a theoretical viewpoint on the basis of a design example for high-power applications. The actively delayed time correction method to compensate distorted currents due to a relatively long resonant commutation time is newly implemented in the open loop control scheme so as to acquire the new optimum PWM pattern. Finally, the experiment of set-up in laboratory system of this converter is concretely demonstrated herein to confirm a zero current soft-switching commutation of this converter. The comparative evaluations between current-fed hard-switching PWM and soft-switching PWM converters are carried out from a viewpoint of their PWM converter characteristics.

Three-phase current-fed soft-switching PWM converterwith switched capacitor type resonant DC-link snubber

An approach to the correction of the resonant commutation time of a three-phase current-fed zero current soft-switching pulse-width modulation converter is described, and the converter characteristics are discussed.