03-07-2012, 11:39 AM
Design and Simulation of Digital PID Controller for Open loop and Closed Loop Control of Buck Converter
Digital PID Controller for Open loop.pdf (Size: 412.2 KB / Downloads: 104)
Abstract
This paper presents an implementation of an open loop and
closed loop digital PID controller using microcontroller, 8051
for control of buck converter. The controller is used to change
the duty cycle of the converter and thereby, the voltage is
regulated. The buck converter, P, PI and PID controller are
modeled and are evaluated by computer simulations. It has
been found that the transient performance and steady state
performance is improved using PID controller.
Introduction
To produce quality goods in any industry, the process necessarily
require the use of variable speed drives. Variable speed dc and
ac drives are being increasingly used in all industries. These
drives and process take power from dc voltage sources. In
many cases, conversion of the dc source voltage to different
levels is required.
Hardware Implementation
Buck converter and digital PID controller modeled in MATLAB
has been experimentally verified. Fig. 8 and Fig. 9 show the
schematic diagram of open loop and closed loop control of
buck converter with 8051 microcontroller.
Conclusion
As concluding remark, the performance of the open loop and
closed performance is analysed using MATLAB and found that
the performance of closed loop controller gives satisfactory
response with buck converter. It is found that the step response
of digital PID controller implementation in microcontroller 8051
is simple and can implement in cost-effectively. In future it
can be extended to study the performance of intelligent
controller.