Review of GaN Totem-Pole Bridgeless PFC

Abstract

Abstract-Switching-mode AC/DC converters are widely used in modern power supplies for computers, data centers and telecommunication equipment. Achieving Power Factor Correction (PFC) and high efficiency are the two most important requirements. In many cases, high power density is also of tremendous interest. Both power efficiency and power density are greatly influenced by the power devices, the topology and the control used. Compared with conventional Si power MOSFET and Si super-junction MOSFET, the newly introduced 600 V GaN devices not only eliminate the reverser recovery, but also have much lower switching and driving losses. These excellent properties enable the emergence of the totem-pole bridgeless AC/DC converter as the next generation preferred solution for PFC instead of the stateof-the art Si-based boost PFC. In this paper, the key technologies and designs for both hard-switching and soft-switching GaN totem-pole PFC are reviewed and the key performance metrics are compared. A soft switching, 3.2 kW totem-pole PFC prototype with 99% efficiency and 130 W/inch3 power density has been achieved in the author's group as a proof of the concept. Based on the power density comparison, the high frequency soft-switching GaN totem-pole PFC is the preferred choice to achieve both high efficiency and high power density at the same time.Index Terms-Bridgeless PFC, PFC, soft switching, totem-pole PFC, WBG power device.

A Comparative Study of GaN HEMT and Si MOSFET-Based Active Clamp Forward Converters

“…According to the voltage stress for this ACF forward converter, the performances of the 80 V or 100 V state-of-the-art Si MOSFET and GaN FETs are compared in Table 2. In this comparison, three normalized figure of merits (FOMs) [32] is employed. The smaller the FOM, the better performance the device is.…”

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

“…However, their problem is that they apply the restriction of using a certain topology and control strategy for each combined main converter+APD solution. With the advent of wide bandgap (WBG) devices, many topologies have gained more desirability, including the totem-pole rectifier topology [19], [20]. Additionally, as switching frequency limits are getting increased, softswitching control methods are gaining more importance.…”

Retificador PFC Monofásico Bridgeless Baseado em Interruptores GaN HEMT Empregando Estratégia de Modulação Pwm de Alta Resolução Implementada em FPGA

“…Assim, com a proximidade do limite físico dos interruptores baseados puramente em silício, o crescimento de tecnologias wide bandgap, como o carbeto de silício e o nitreto de gálio, torna-se iminente no ramo da Eletrônica de Potência [4], [5]. No âmbito de topologias PFC, o uso de estratégias para comutação suave com o emprego de interruptor de GaN HEMTs proporcionam medições de rendimento acima de 99% e valores elevados de densidade de potência [9]- [11].…”

“…A função de transferência do conversor utilizada no projeto da malha de corrente, G i (s), é apresentada na equação (9). Para a malha de tensão, foi utilizada a função de transferência G v (s), representada na equação (10).…”