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The ACMC is the two loop technique, (inner, outer,
and the voltage) in power electronics. There are many applications which are
used in the higher switching, frequency, as well as the lower power segment at
the changing frequency. The main features of the ACMC is compared by the
current mode control , where the ACMC is used as the high gain by the wide bandwidth
as a CEA current error Amplifier for the average force of the current by the
converter, in the inductor current as demand is the reference current of the
small error. The Advantage of the ACMC is include for the large noise margin ,
where the additional requirements for the slope compensations , is easy for the
current limit of the implementation , and the excellent voltage as well as the
regulation of current , in continuous and discontinuous modes of inductors.
Principle of Operation
The implementation of the ACMC for the analog
amplifiers is used as the error amplifier plus utilize the wide band sensing of
the inductor current where it include the DC and AC components. Below figure
presents the basic buck converter by the synchronous rectification. The
waveform of voltage is representing by the inductor current which is connected
by the input of the CEA through the large gain of the DC as well as low
frequencies for the average force , where the inductor current is follow the
reference that is connected with other input.
Figure 4:
Schematic of Buck converter with ACMC
Analog versus
Digital Control of Average Current Mode Control
of Switching Power Supplies
Analog Control
There are few advantages of the analog control;
Relative
simplicity
Lower
cost ;wider bandwidth ;small delay among effect and cause
Amplitude
and time of finer resolution
Now some are a disadvantage which is including;
Fixed
relatively
Simple
functionality
Noise is susceptibility
Drift and
ageing
Large
number of components
Digital Control
The advantages are listed below
Programmability
Nonlinear
control; adaptive
Possibility
of self-calibration and diagnosis
Now some are a disadvantage which is including;
The
software development is tedious
Time
consuming
Expensive
Microcomputer
suffer from noise
Sampling and
quantisation
References of ACMC in Power Electronic Converter of Average Current Mode Control of Switching Power Supplies
|
[1] |
K. D. Purton and
et.al, "AVERAGE CURRENT MODE CONTROL IN POWER ELECTRONIC CONVERTERS –
ANALOG," http://chamilo1.grenet.fr/ujf/courses/PGEL4107/document/Datasheet_UC3842/K-D-Purton.pdf?cidReq=PGEL4107&id_session=0&gidReq=0&origin=,
2002. |
|
[2] |
L. H. Dixon,
"“Average current-mode control of switching power supplies,”," Unitrode
Power Supply Des. Semin. Handbook, pp. 5.1-5.14, 1990. |
|
[3] |
L. E. Gallaher,
"“Current regulator with AC and DC feedback,”," U.S. Patent, 1967.
|
|
[4] |
Maxim;,
"MAX1545 datasheet. Maxim Integrated Products, Inc.," 2003.
[Online]. Available: http://datasheets.maxim-ic.. |
|
[5] |
STMicroelectronics,
PM6685 datasheet., "STMicro-electronics, Inc., Geneva,
Switzerland," 2007. [Online]. Available:
https://www.st.com/content/st_com/en.html. |
|
[6] |
A. V. Peterchev and
S. R. Sanders, "“Load-line regulation with estimated load-current
feedforward: Application to microprocessor voltage regulators,”," IEE
trans, pp. 1704-1717, 2006. |
|
[7] |
S. Saggini, W.
Stefanutti, E. Tedeschi and P. Mattavelli, ""Digital dead beat
control tuning for DC–DC converters using error correlation,”," IEE
trans Power Electron, pp. 1566-1570, 2007. |
|
[8] |
L. Dixon,
"Average Current Mode Control of Switching Power Supplies," Unitrode
APPLICATION NOTE, 1999. |
|
[9] |
S. Chunxiao and B.
Lclunun, "Modeling of Average Current Mode Control In PWM DC/DC
Converters," IEEE, 1999. |
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