Date: 14th July 2011
Free PFC power supply design reference
from Power Integrations
Power Integrations has published a new design example
report DER-274 based on its HiperPFS family describing a
900-watt power supply with 97%-efficient active power factor
correction (PFC) to passive PFC solutions for white goods,
blowers, computers/servers, power supplies, and motor control
drives.
Power Integrations explains 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 and it is suitable
for PFC applications from 85 W to 1 kW, employs a 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 and comparing
with designs that use discrete MOSFETs and controllers,
as per Power Integrations.
Power Integrations says the power supply detailed in DER-274,
based on HiperPFS part number PFS729EG, is a general-purpose,
high-efficiency evaluation platform that operates from 180
VAC to 264 VAC input and provides a regulated 380 VDC output
voltage and a continuous output power of 900 W at 25ºC.
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.
Comments Edward Ong, product marketing manager at Power
Integrations: "The HiperPFS family stands apart from
competing PFC solutions for the high efficiency and high
power factor that can be achieved across the load range,
as well its ease of use and low external parts count. Designers
of white goods, blowers, and water pump applications can
use HiperPFS to meet high power factor and line harmonic
standards."
For more information visit: www.powerint.com
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