2-MHz GaN PWM isolated SEPIC converters

Based on the research of resonant inverter stage in Chap. 2, resonant rectifier stage in Chap. 3 and matching network in Chap. 4, many different kinds of multi-MHz DC-DC converters can be derived. In this Chapter, some typical DC-DC converters with different characteristics will be described. Non-isolated DC-DC ConverterAs the circuit diagram introduced in Chap. 1, the simplest DC-DC converter can be composed only by inverter stage and rectifier stage, which realizes DC-to-AC transformation and AC-to-DC transformation, respectively.Figure 5.1 shows the circuit of resonant Boost converter which is composed by Class E inverter stage and voltage-driven Class E rectifier stage [1]. Based on the similar idea, the resonant boost converter based on Class 2 inverter stage can also be built as Fig. 5.2 shown [2]. The operating modes of the two topologies are similar. For both topologies, the equivalent impedance of the rectifier meets the inverter requirement. Thus, the matching network is not added in the circuits. As can be noticed from the topologies, there are only inductors and diode in series between the input voltage and output voltage. The average voltage of the inductor during one period is zero, and the average voltage of the diode during one period is negative. Thus, for this kind of topologies, they can only provide step-up voltage conversion ability. If the step-down voltage conversion ability is needed, there must be a DC blocking capacitor in series between the input port and output port. The main difference is that the resonant boost circuit based on Class 2 inverter stage owns lower switch voltage stress which is suitable to be applied in high input voltage applications.When the impedance of rectifier stage and inverter stage is not matched, the matching network is needed to be added between these two stages. Figure 5.3 shows the circuit of the SEPIC converter [3], the inverter stage is Class E topology, the rectifier stage is current-driven resonant topology, and the matching network is L-type

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“…The Class E inverter-based and Class 2 inverterbased isolated converters are shown in Fig. 5.11 [10] and Fig. 5.12 [11], respectively.…”

Section: Fig 510 Circuit Of Class E Inverter With Capacitive Isolation Barriermentioning

confidence: 99%

Typical Multi-MHz DC–DC Converter

Guan

Wang

et al. 2020

CPSS Power Electronics Series

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“…To further make the converter more compact and reduce the cost, the integrated inductors have been investigated for the bridgeless Dual-SEPIC PFC in this paper. In the DC-DC SEPIC converter, the integrated inductor has been used [33]- [34]. By tightly coupled the input inductor and output inductor, the effective inductance can be double, and thus the current ripple can be reduced.…”

Section: Introductionmentioning

confidence: 99%

GaN-Based ZVS Bridgeless Dual-SEPIC PFC Rectifier With Integrated Inductors

Liu

Huang

Dou

et al. 2021

IEEE Trans. Power Electron.

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“…Saif et al (2017) realizes SEPIC converter design for 1.5 MHz switching frequency and 100W power using GaN switch. Isolated SEPIC converter using GaN switch with 2 MHz switching frequency is presented in Xu et al (2017). Alharbi et al (2018) realizes interleaved SEPIC converter by using SiC power switch for renewable application.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies defined in references realized the usage of the GaN switch with higher frequency such as 500kHz-2Mhz as in Saif et al (2017), Xu et al (2017), Gao et al (2019) and more than 12V output voltage with relatively higher power than 10W as in Gao et al (2020), Saif et al (2017), Alharbi et al (2018), Maharjan et al (2017), Gao et al (2019). However, in this paper, SEPIC converter based led driver application for up to 10W power with up to 12V output voltage is realized by using Si MOSFET and E-Mode GaN-HEMT based power switches.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Si ve GaN Yarı İletken tabanlı SEPIC DC-DC Led Sürücülerin Karşılaştırılması

Şehirli¹

2020

European Journal of Science and Technology

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Recently, in power electronics, studies on creating new semiconductor concept is so popular. As a result of this studies, using of wide band gap semiconductors (WBG) such as Silicon Carbide (SiC) Mosfets and Gallium Nitride High Electron Mobility Transistors (GaN-HEMT) has gained much attention due to the its high switching frequncy capability and providing high power density feature. Furthermore, in the field of illumination, power leds is so eye cathing because of their high efficinecy feature with respect to other kind of illumination such as metal halide and incandesant bulbs. In addition, to operate power leds, DC power is required and the most efficient way to provide required DC power is to use one of the DC-DC converter topologies. Buck-boost derived converter topology is the best solution fort that purpose. One of the flashiest topologies is single ended primary inductor (SEPIC) converter. Therefore, in this paper, comparison of SEPIC DC-DC converter-based power led driver using silicon (Si) and enhancement mode (E-mode) GaN-HEMT based power switch is made. Also, SEPIC led drivers are designed for 10W power led and implementations for both power switches are realized. In addition, switching frequency of converters is chosen as 100kHz and dsPIC30F4011 micro controller is used to produce PWM signal for power switches and to limit maximum current of power leds by using ACS712 current sensor. By means of the applications, power led current, power led voltage, input current, input voltage and input side inductor current, switch voltage, gate resistor voltage are measured and compared for both Si and GaN based power switches. As a result of comparisons, altough similar results are obtained, circuit using Si MOSFET has slightly higher efficiency than E-Mode GaN-HEMT used circuit. Besides, circuit using E-Mode GaN-HEMT is more sensitivity to the noises and needs extra care for its soldering.

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2-MHz GaN PWM isolated SEPIC converters

Cited by 10 publications

References 12 publications

Typical Multi-MHz DC–DC Converter

Typical Multi-MHz DC–DC Converter

GaN-Based ZVS Bridgeless Dual-SEPIC PFC Rectifier With Integrated Inductors

Si ve GaN Yarı İletken tabanlı SEPIC DC-DC Led Sürücülerin Karşılaştırılması

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