Power Tips #139: How to simplify AC/DC flyback design with a self-biased converter

Power Tips #139: How to simplify AC/DC flyback design with a self-biased converter

Introduction The demand for smaller, lighter, and more efficient AC/DC USB power delivery (PD) chargers is always a challenge for power-supply design engineers. Below 100 W, the quasi-resonant flyback is still the dominating topology, and gallium nitride (GaN) technology can push the power density and efficiency further. However, providing bias power for the primary controller…

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Power Tips #138: 3 ways to close the control loop for totem-pole bridgeless PFC

Power Tips #138: 3 ways to close the control loop for totem-pole bridgeless PFC

Introduction Among all power factor correction (PFC) topologies, totem-pole bridgeless PFC provides the best efficiency; therefore, it is widely used in servers and data centers. However, closing the current control loop of a continuous conduction mode (CCM) totem-pole bridgeless PFC is not as straightforward as it is for a traditional PFC. A traditional PFC operating…

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