Full state observer-based pole placement controller for pulse width modulation switched mode voltage-controlled buck...

Area of Science:

• Electrical Engineering
• Control Systems
• Power Electronics

Background:

• Switched mode DC-DC converters are crucial for renewable energy, electric vehicles, and appliances.
• High implementation cost of controllers remains a challenge for DC-DC converters.
• Existing controllers often require current sensors, increasing complexity and cost.

Purpose of the Study:

• To propose a cost-effective observer-based pole placement controller for PWM voltage-controlled Buck converters.
• To eliminate the need for a current sensor by using a full-state observer.
• To provide a clear, step-by-step design methodology for the proposed controller.

Main Methods:

• Utilized the state-space averaged model of the Buck converter.
• Designed a pole placement controller with an integrator compensator for improved transient and steady-state response.
• Implemented a full-state observer to estimate inductor current, removing the need for a physical sensor.
• Applied the separation principle for independent design of controller and observer, ensuring faster observer convergence.

Main Results:

• The controller demonstrated effective tracking of the reference output voltage, even with input voltage disturbances.
• The full-state observer accurately estimated the inductor current, validated by simulations in MATLAB/SIMULINK.
• The designed controller and observer were successfully realized using low-cost analog electronic components.
• Achieved design specifications of settling time < 5 msec and overshoot < 5%.

Conclusions:

• The proposed observer-based pole placement controller offers a cost-effective solution for DC-DC converters.
• The sensorless approach simplifies converter design and reduces implementation costs.
• The controller ensures robust performance and accurate voltage regulation in various applications.