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In most power supply topologies the
disadvantages of the voltage-mode control are important as well as by this
scheme most of these were effectively alleviated. For designing the control
circuits current mode control schemes become popular as compared to other
scheme of control. As in the figure you can see the circuit diagram for the
current-mode control. Multi loop scheme is used in this current mode control
scheme. The peak value of the inductor current controls by the inner loop,
output voltage is controlled by the outer voltage loop. This is quite
complicated modelling than the voltage-mode control also requires modelling of
sampled data. Short circuit protection is provided by these schemes as well as
in PWM converters over current protection. The response of this scheme is fast
as well as wide band. There is also some limitation of this scheme which we
discussed here;
In this
method with two current loops the circuit analysis becomes difficult.
At the
duty ratio 0.5 the control loop has inherent instability. The following things
that made more complication while analyzing such as higher duty cycles, slope
compensation,
It
produces noise in the loop when the ripple produces due to the small amount of
current.
Since the
control loop is forcing a current drive load regulation is significantly
affected.
It is clear from the above disadvantages although
this scheme alleviates the restriction through the voltage-mode control, for
the operation of PWM converters it is still not the optimum mode of control. In
reality, in the power control technology indicates the recent development.
Figure: dc-dc buck converter operating under
current mode control scheme.
Because
of the new controller that help to control the flows of voltage mode control.
By providing feed-forward voltage this controller significantly enhance the
design of voltage-mode control to the changes in the input voltage as well as
resulting in smaller parasitics by using BicMOS. The voltage feed-forward could
be achieved if the compensating ramp is made proportional to the input voltage.
Without providing the voltage feed-back the control modulation is accomplished.
Moreover, this eliminated the problem of slow response. In high frequency
capabilities these design changes result as well as for RC-circuit higher
bandwidth at the output. In voltage mode several problems of the earlier
topologies have been improved in the controller.
References of Current Mode Control Scheme of Average Current Mode Control of Switching Power Supplies
|
[1] |
L. H. Dixon,
"“Average current-mode control of switching power supplies,”," Unitrode
Power Supply Des. Semin. Handbook, pp. 5.1-5.14, 1990. |
|
[2] |
L. E. Gallaher,
"“Current regulator with AC and DC feedback,”," U.S. Patent, 1967.
|
|
[3] |
Maxim;,
"MAX1545 datasheet. Maxim Integrated Products, Inc.," 2003.
[Online]. Available: http://datasheets.maxim-ic.. |
|
[4] |
STMicroelectronics,
PM6685 datasheet., "STMicro-electronics, Inc., Geneva,
Switzerland," 2007. [Online]. Available:
https://www.st.com/content/st_com/en.html. |
|
[5] |
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. |
|
[6] |
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. |
|
[7] |
L. Dixon,
"Average Current Mode Control of Switching Power Supplies," Unitrode
APPLICATION NOTE, 1999. |
|
[8] |
S. Chunxiao and B.
Lclunun, "Modeling of Average Current Mode Control In PWM DC/DC
Converters," IEEE, 1999. |
|
[9] |
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. |
|
[10] |
N.Vishwanathan and
D. V.Ramanarayanan, "Average Current Mode Control of High Voltage DC
Power Supply for Pulsed Load Application," IEEE, 2002. |
|
[11] |
D. K. Saini and
et.al, "Average Current-Mode Control of Buck DC-DC Converter With
Reduced Control Voltage Ripple," IEEE, pp. 3070-3075, 2016. |
|
[12] |
R. M. Kotecha,
"Analysis and Comparison of Popular Models forCurrent-Mode Control of
Switch Mode Power Supplies," Wright State University, INDIA, 2010. |
|
[13] |
R. Chandranadhan
and Renjini.G, "Comparison Between Peak and Average current," IEEE
International Conference on Technological Advancements in Power &
Energy, 2015. |
|
[14] |
B.-Y. Chen and
Y.-S. Lai, "New Digital-Controlled Technique for Battery," IEEE
TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 59, no. 3, 2012. |
|
[15] |
D. Gacio, J. M.
Alonso, A. J. Calleja, J. García and M. Rico-Secade, "A
Universal-Input Single-Stage High-Power-Factor Power Supply for HB-LEDs
Based on Integrated Buck–Flyback Converter," Manuel Rico-Secade, vol.
58, no. 2, p. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2011. |
|
[16] |
C.-Y. Huang, J. T.
Boys and G. A. Covic, "LCL Pickup Circulating Current
Controller," IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 28,
no. 4, 2013. |
|
[17] |
H. L. Ying Qiu and
X. Chen, "Digital Average Current-Mode Control of PWM DC–DC Converters
Without Current Sensors," IEEE TRANSACTIONS ON INDUSTRIAL
ELECTRONICS, vol. 57, no. 5, 2010. |
|
[18] |
A. Leon-Masich, H.
Valderrama-Blavi, J. Bosque-Moncusí and J. Maixé-Altés, "Sliding- Mode
Control- Based Boost," IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
, 2015. |
|
[19] |
J. Li and F. C.
Lee, "New Modeling Approach and Equivalent Circuit," IEEE
TRANSACTIONS ON POWER ELECTRONICS, vol. 25, 2010. |
|
[20] |
M. Rodr´ıguez, V.
M. Lopez, F. J. Azcondo, J. Sebastian and D. Maksimovic, "Average
Inductor Current Sensor for Digitally Controlled Switched-Mode Power
Supplies," IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 27, no.
8, 2012. |
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