Switching Losses Minimization Method for EV Inverter with Individual Sequential Gating of Parallel-Connected Switches

Im Seong-Hwan,Park Gwangmin,Kim Jae-Heon,Gu Bon-Gwan 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

To achieve high output currents at a low cost, semiconductor switch modules are frequently operated in parallel. The simplest way to drive the parallel switching module is to synchronize all on and off gate signals of each switch. Individual control is used in this article to reduce switching losses by applying a short delay time to each switching signal based on current level. Experiments are performed to compare the individual control method and the synchronization control method, and the optimal switching combination with the lowest switching loss is proposed. This proposed switching method is simulated by applying to the Urban Dynamometer Driving Schedule and the Highway Fuel Economy Test, both of which are energy effi ciency calculation standards in electric vehicles. The results of the analysis demonstrate the feasibility and practicality of the proposed individual switching method.

Applicable Method for Average Switching Loss Calculation in Power Electronic Converters

Seyyed Abbas Saremi Hasari,Ahmad Salemnia,Mohsen Hamzeh 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4

Accurate calculation of the conduction and switching losses of a power electronic converter is required to achieve the efficiency of the converter. Such calculation is also useful for computing the junction temperature of the switches. A few models have been developed in the articles for calculating the switching energy losses during switching transitions for the given values of switched voltage and switched current. In this study, these models are comprehensively reviewed and investigated for the first time for ease of comparison among them. These models are used for calculating the average amount of switching power losses. However, some points and details should be considered in utilizing these models when switched current or switched voltage presents time-variant and alternative quantity. Therefore, an applicable technique is proposed in details to use these models under the above-mentioned conditions. A proper switching loss model and the presented technique are used to establish a new and fast method for obtaining the average switching power losses in any type of power electronic converters. The accuracy of the proposed method is evaluated by comprehensive simulation studies and experimental results.

Analysis of Power Losses in Z-Source PV Grid-Connected Inverter

Wang Wei,Liu Hongpeng,Zhang Jiawan,Xu Dianguo 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

Calculating power losses of the inverter plays an important role for improving system efficiency and power density, designing heat dissipation system and selecting the power devices. Generally, power losses include the main switch losses (conducting losses and switching losses), the drive losses, control circuit losses and losses of inductor. Among them, the losses of semiconductor power switching devices are the largest losses. This paper analyzed the power losses of blocking diode, switching devices of H-bridge, Z-source inductor and filter inductor in detail, combined operating principle with modulation strategy. And the practical formula is deduced. The experimental results verified the proposed method.

Comparative Study of Minimum Ripple Switching Loss PWM Hybrid Sequences for Two-level VSI Drives

G. Vivek,Jayanta Biswas,Meenu D. Nair,Mukti Barai 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

Voltage source inverters (VSIs) are widely used to drive induction motors in industry applications. The quality of output waveforms depends on the switching sequences used in pulse width modulation (PWM). In this work, all existing optimal space vector pulse width modulation (SVPWM) switching strategies are studied. The performance of existing SVPWM switching strategies is optimized to realize a tradeoff between quality of output waveforms and switching losses. This study generalizes the existing optimal switching sequences for total harmonic distortions (THDs) and switching losses for different modulation indexes and reference angles with a parameter called quality factor. This factor provides a common platform in which the THDs and switching losses of different SVPWM techniques can be compared. The optimal spatial distribution of each sequence is derived on the basis of the quality factor to minimize harmonic current distortions and switching losses in a sector; the result is the minimum ripple loss SVPWM (MRSLPWM). By employing the sequences from optimized switching maps, the proposed method can simultaneously reduce THDs and switching losses. Two hybrid SVPWM techniques are proposed to reduce line current distortions and switching losses in motor drives. The proposed hybrid SVPWM strategies are MRSLPWM 30 and MRSLPWM 90. With a low-cost PIC microcontroller (PIC18F452), the proposed hybrid SVPWM techniques and the quality of output waveforms are experimentally validated on a 2 kVA VSI based on a three-phase two-level insulated gate bipolar transistor.

Comparative Study of Minimum Ripple Switching Loss PWM Hybrid Sequences for Two-level VSI Drives

Vivek, G.,Biswas, Jayanta,Nair, Meenu D.,Barai, Mukti The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

Voltage source inverters (VSIs) are widely used to drive induction motors in industry applications. The quality of output waveforms depends on the switching sequences used in pulse width modulation (PWM). In this work, all existing optimal space vector pulse width modulation (SVPWM) switching strategies are studied. The performance of existing SVPWM switching strategies is optimized to realize a tradeoff between quality of output waveforms and switching losses. This study generalizes the existing optimal switching sequences for total harmonic distortions (THDs) and switching losses for different modulation indexes and reference angles with a parameter called quality factor. This factor provides a common platform in which the THDs and switching losses of different SVPWM techniques can be compared. The optimal spatial distribution of each sequence is derived on the basis of the quality factor to minimize harmonic current distortions and switching losses in a sector; the result is the minimum ripple loss SVPWM (MRSLPWM). By employing the sequences from optimized switching maps, the proposed method can simultaneously reduce THDs and switching losses. Two hybrid SVPWM techniques are proposed to reduce line current distortions and switching losses in motor drives. The proposed hybrid SVPWM strategies are MRSLPWM 30 and MRSLPWM 90. With a low-cost PIC microcontroller (PIC18F452), the proposed hybrid SVPWM techniques and the quality of output waveforms are experimentally validated on a 2 kVA VSI based on a three-phase two-level insulated gate bipolar transistor.

병렬 스위치의 개별제어를 통한 스위칭 손실 최소화기법 연구

김재헌(Jae-Heon Kim),임성환(Seong-Hwan Im),구본관(Bon-Gwan Gu) 대한전기학회 2021 전기학회논문지 Vol.70 No.5

Generally, high-power inverters are composed of power semiconductors connected in parallel such as an IGBT. The simplest way to control semiconductors connected in parallel is to control all switches with the same switching sequence. However, this control method can cause high switching losses in all switches and imbalance in life among switches. This paper proposes switching patterns that minimize switching losses by individual control of the switches. Different switching losses are calculated depending on the switching pattern and compared by experiment. Through this process, switching patterns that minimize losses are analyzed. Experimental results show that the overall inverter efficiency can be increased with the proposed method under the various current conditions.

A DSVM Method for Matrix Converters to Suppress Common-mode Voltage With Reduced Switching Losses

Huu-Nhan Nguyen,Hong-Hee Lee Institute of Electrical and Electronics Engineers 2016 IEEE transactions on power electronics Vol. No.

<P>This paper proposes a direct space-vector modulation (DSVM) method that can reduce the common-mode voltage (CMV) as well as the switching losses for matrix converters in a high voltage transfer ratio. Even though the previous DSVM improvements can reduce the CMV peak value to 42%, compared to the conventional DSVM method, they incur high switching losses. The DSVM method proposed in this paper provides the same CMV peak value as previous methods with lower switching losses. The switching losses are theoretically analyzed through the accumulated switched voltage in a switching period and compared to those of previous methods. Simulation and experimental results are given to verify the input/output waveforms, CMV reduction, and lower switching losses of the proposed DSVM method.</P>

Reducing Switching Losses in Indirect Matrix Converter Drives: Discontinuous PWM Method

박영수,이교범 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

This paper presents a discontinuous pulse width modulation (DPWM) method to reduce switching losses in an indirect matrix converter (IMC) drive. The IMC has a number of power semiconductor switches. In other words, it consists of a rectifier stage and an inverter stage for AC/AC power conversion, which are composed of 12 and 6 switching devices, respectively. Therefore, the switching devices of the IMC suffer from high switching losses in the IMC drives. Various topologies to reduce switching losses have been studied by eliminating a number of switches from the rectifier stage. In this study, in contrast to prior research, a DPWM method is presented to reduce the switching losses of the inverter stage. The effectiveness of the proposed method to reduce switching losses in IMC drives is verified by simulations and experimental results.

Reducing Switching Losses in Indirect Matrix Converter Drives: Discontinuous PWM Method

Bak, Yeongsu,Lee, Kyo-Beum The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

This paper presents a discontinuous pulse width modulation (DPWM) method to reduce switching losses in an indirect matrix converter (IMC) drive. The IMC has a number of power semiconductor switches. In other words, it consists of a rectifier stage and an inverter stage for AC/AC power conversion, which are composed of 12 and 6 switching devices, respectively. Therefore, the switching devices of the IMC suffer from high switching losses in the IMC drives. Various topologies to reduce switching losses have been studied by eliminating a number of switches from the rectifier stage. In this study, in contrast to prior research, a DPWM method is presented to reduce the switching losses of the inverter stage. The effectiveness of the proposed method to reduce switching losses in IMC drives is verified by simulations and experimental results.

Reducing Switching Losses in Indirect Matrix Converter Drives

Yeongsu Bak,Kyo-Beum Lee 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

This paper presents a discontinuous pulse width modulation (DPWM) method to reduce switching losses in an indirect matrix converter (IMC) drive. The IMC has a number of power semiconductor switches. In other words, it consists of a rectifier stage and an inverter stage for AC/AC power conversion, which are composed of 12 and 6 switching devices, respectively. Therefore, the switching devices of the IMC suffer from high switching losses in the IMC drives. Various topologies to reduce switching losses have been studied by eliminating a number of switches from the rectifier stage. In this study, in contrast to prior research, a DPWM method is presented to reduce the switching losses of the inverter stage. The effectiveness of the proposed method to reduce switching losses in IMC drives is verified by simulations and experimental results.