SG6961SZ

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Power factor correction (PFC) is a key technology used in the power electronic industry. It is widely used in applications ranging from residential and commercial buildings to automotive and industrial systems. This article will focus on the SG6961SZ application field and working principle within the context of PFC.The SG6961SZ is a highly integrated power factor correction IC for mid-to-high power applications. It is capable of regulating the input current and voltage, and also provides current sharing for multiple power supplies. The SG6961SZ is an ideal solution for a wide variety of PFC applications such as motor drives, home appliances, air conditioning systems, and home entertainment systems.The SG6961SZ integrates all necessary PFC control circuits, e.g., main and auxiliary power switches, gate driver, start-up circuit, comparators, thermal protection, etc., and supports a wide input voltage range of 85 V to 265 V and a wide maximum output power of 2 kVA. Its high performance, ease of use and small footprint make it an ideal solution for high power applications. The SG6961SZ also provides various protection and diagnostic functions to ensure system safety and reliability. The device incorporates an active burst mode, which minimizes light load power consumption. This feature makes it ideal for standby power supplies. The device also features cycle-by-cycle current limiting, short-circuit protection, over-voltage protection, and over-temperature protection to ensure system stability and reliability. The SG6961SZ works by converting AC input voltage to DC voltage at a high power factor. The power switches, controlled by PFC logic, alter the on-time of the switches to regulate the current, thus achieving a sinusoidal input current waveform, in turn, reduces total harmonic distortion. The device uses a peak current control technique for power factor corrections. It senses the input current by sampling the primary peak current of the power transformer and then produces the duty cycle according to the current reference. It also regulates the load current by continuously comparing the sensed current with a reference current. If the sensed current is higher than the reference current, the duty cycle is increased; whereas, if the sensed current is lower than the reference current, the duty cycle is decreased. To summarize, the SG6961SZ is an ideal PFC solution for mid-to-high power applications. It provides high performance, wide input voltage range, and various protection functions, which ensure system stability and reliability. The device also offers an active burst mode, which minimizes light load power consumption, making it an ideal solution for standby power supplies. Finally, it utilizes peak current control for power factor correction, which reduces total harmonic distortion.

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