Page 21 - PEN eBook NOVEMBER 2022

POWER SUPPLY POWER SUPPLIES

*The enable pin is designed to connect to the remote on/off pin of the DC/DC converter as a power-good signal.
Power-factor correction is a method to adjust the 100˚C (–40˚F to 212˚F). On top of that, this module has
a more extended lifetime than usual because there is
harmonic distortion and reduce reactive power by
The Application overlapping the voltage and current waveforms. no existing electrolytic cap inside.

There are “passive” and “active” modes to maximize
The most common way of applying the PFC750
and Features of the effectiveness of PFC. The active mode employs a module is to partner with DC/DC converters: to take
the AC/DC module as the front end and the DC/DC
boost converter to enhance the switching frequency
Cincon’s PFC750 AC/DC and control the shape of the waveform of the input converter as the back end.
current. The passive mode utilizes an inductor and
capacitor to decrease the effect of the peak current.
Power Supply Both methods are applicable; however, the operation
of active PFC adjusts the PF value more efficiently and
directly. That’s why active mode is more popular than
passive mode.
By Cincon Electronics
CINCON’S PFC750 MODULE
While the concept of energy saving is popular an AC system. It is normally defined by the ratio of real As mentioned, Cincon’s PFC750 module successfully
among industries today, almost all the power supply power and apparent power (see Figure 1). achieves the criterion of a 0.99 PF with a 750-W power
manufacturers are expecting a breakthrough in the supply. Its specification is a standard half-brick, low-
feature of lower power consumption with high efficiency. Practically, the harmonic phenomenon occurs when profile AC/DC power converter with the universal input
the current and voltage are distorted and away from range of 90–264 VAC and a high 390-VDC output.
According to the “Energy Star” guideline, consumer normal waveforms. To be more specific, the harmonic
products over 100 W are suggested to reach at least currents exist at the point that the line voltage goes Accordingly, the PFC750 is designed by a boost
a 0.9 power factor (PF) to promote energy efficiency. beyond the cross-voltage, which causes current from converter; thus, its efficiency performs up to 96.5%.
PF is also crucial to reduce energy consumption: The the bulk capacitor and results in the waveform being The working case temperature ranges from –40˚C to Figure 2: PFC750 mechanical drawing
higher it is, the less power wasted on running the discontinued. These harmonic currents contribute to
devices. reactive power, which lowers the value of the apparent
power.
Cincon’s new PFC750 module not only reaches
a PF of 0.99 but comes with appealing features
when combining DC/DC converters. In the following
paragraphs, we will discover more about PF and
power-factor correction (PFC), as well as PFC750’s
applications.

WHAT ARE PF AND PFC?
Power factor is a digit between –1 and 1 that
represents the efficiency of incoming power usage in Figure 1: PF and harmonic current distortion Figure 3: Application circuitry

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