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900W power supply has 97%-efficient active PFC

Posted: 21 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:900W? power supply? PFC controller?

Power Integrations has released a design example report describing a 900W power supply with 97 percent-efficient active power factor correction (PFC). Based on the company's HiperPFS family of highly integrated, high-efficiency PFC controller ICs, the design offers a smaller, lighter, higher efficiency alternative to passive PFC solutions for white goods, blowers, computers/servers, power supplies, and motor control drives.

The HiperPFS family of PFC controllers incorporates a continuous conduction mode (CCM) boost PFC controller, gate driver, and high-voltage power MOSFET in a single, low-profile eSIP package. Suitable for PFC applications from 85WC1kW, HiperPFS devices employ an innovative control scheme that optimizes efficiency over the entire load range of the converter, particularly at light loads. This variable-frequency control technique also reduces EMI filtering requirements due to its wide-bandwidth, spread-spectrum effect. Compared with designs that use discrete MOSFETs and controllers, HiperPFS devices reduce component count and board footprint, while simplifying system design and enhancing reliability.

The power supply detailed in DER-274, based on HiperPFS part number PFS729EG, is a general-purpose, high-efficiency evaluation platform that operates from 180C264 VAC input and provides a regulated 380VDC output voltage and a continuous output power of 900W at 25C.

HiperPFS ICs include Power Integrations' standard set of comprehensive safety features, such as integrated soft-start, undervoltage, overvoltage, brown-in/out, and hysteretic thermal shutdown protection. HiperPFS also provides cycle-by-cycle current limit for the power MOSFET, power limiting of the output for over-load protection, and pin-to-pin short-circuit protection.

This design example report (DER-274) is free to download now from the Power Integrations website. The HiperPFS product introductory video, data sheet, application notes, and other design examples are available on the company's website.

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