2012 1 13 Interleaaved Converter
2012 1 13 Interleaaved Converter
2012 1 13 Interleaaved Converter
99~103, 2012
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1. Introduction
Rapid changes in voltages and currents within a
switching converter cause electromagnetic interference
(EMI). The converter becomes a source of interference for
other equipment in its system, and its EMI also hinders its
own proper operation. The most cost-effective way of
dealing with EMI is to prevent the EMI from being
generated at its source [1]. EMI production can be
attenuated by using an interleaving technique which cancels
unwanted harmonics [2]. Another advantage of using this
approach is that the converter becomes more reliable and
less susceptible to its own noise [1]. The circuit diagram of
an N-phase interleaved step-up converter is shown in Fig. 1.
According to the interleaving technique, the identical
parallel switching cells are operated
iN
+
vg
-
L2
i2
i1
LN
L1
vC
-
100
New Switch-Control Technique for Multiphase Interleaved Converters with Current Sharing and Voltage Regulation
101
Modified R-C
Sync pulse
pulse train
signal
First phase
Second
phase
First phase
Second
phase
First phase
Second
phase
102
New Switch-Control Technique for Multiphase Interleaved Converters with Current Sharing and Voltage Regulation
4. Experimental Results
The proposed control method was implemented with the
two-phase interleaved step-up converter shown in Fig. 3. The
inductor current waveforms of this converter are shown in Fig. 9.
The experimental results show that this control scheme is viable
in the continuous conduction mode (CCM) as well as the
discontinuous conduction mode (DCM) of the converter.
For an interleaved converter it is necessary to ensure that
each cell shares the load current equally in order to reduce
the current stress of the switching devices and to improve
the reliability of the converter. Hereby, current sharing and
voltage regulation are achieved by means of a multi-loop
control scheme in which the outer voltage loop regulates
the output voltage to a desired value while the inner current
loop dictates the peak inductor-current value of each
switching cell. Single-pole compensation is introduced to
the outer loop to ensure system stability. By means of the
proposed switch-control technique, along with the aforesaid
multi-loop control scheme, the output voltage of the
converter is maintained regardless of the input voltage
fluctuation (Fig. 10) and load disturbances (Fig. 11 and
Fig. 12). In addition, the inductor currents of the converter
are always distributed equally among the cells, regardless
of changes in load.
Output
voltage
Output
current
Output
voltage
Output
current
First
Second
phase
phase
5. Conclusions
Output
voltage
Input voltage
References
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electronics: converters, applications, and design, 3rd ed: John
Wiley & Sons, 2003.
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