Delta Electronics (Thailand) has filed a patent for a totem pole PFC with a surge protection circuit. The innovative design includes bypass-diode, switch, and polarity changer branches, along with a current sensor and controller for efficient power factor correction and surge protection. GlobalData’s report on Delta Electronics (Thailand) gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Delta Electronics (Thailand), HEV energy management was a key innovation area identified from patents. Delta Electronics (Thailand)'s grant share as of January 2024 was 64%. Grant share is based on the ratio of number of grants to total number of patents.
Totem pole pfc with surge protection circuit
The patent application (Publication Number: US20240014732A1) describes a totem pole power factor correction circuit (PFC) with a surge protection circuit. The circuit includes bypass-diode branches, switch branches, and polarity changer branches, along with an input bridge and bypass branches. The surge protection circuit features a current sensor to detect current through the bypass-diodes and a controller to switch the PFC's switches based on the detected current value. The controller includes a comparator, latch, and digital signal processor to manage the operation of the PFC.
Furthermore, the surge protection method for the totem pole PFC involves detecting current through the bypass-diodes, comparing it to a protection current value, and switching off the switches when the current exceeds the predetermined value. The method includes holding the switched state with a latch for a specific duration, resetting the latch, and waiting for a predetermined time before switching the switches off. Additionally, the method ensures that current flows through the bypass branch under specific conditions, providing surge protection for the PFC during startup, charging, or surge voltage events. These innovative features aim to enhance the efficiency and safety of power factor correction circuits in various applications.
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