In this paper, the digital controller design for compensating the dc-dc buck converter output voltage has been analyzed in the digital domain. The main idea of this paper is patterning the samples of high order ideal controller and using integral square error in determining digital PID coefficients. This approach provides higher precision of digital controller design and eliminates the need for...

This paper describes the implementation of fuzzy control algorithm (state controller with adjustable gains by fuzzy sets) in DC-DC Buck converter. All tasks are implemented by FPGA. Fuzzy sets are tuned by genetic algorithm of-line by using Fuzzy-logic and genetic toolbox in MATLAB. Fuzzyfication and defuzzyfication algorithms are implemented in real time in Field Programmable Gate Array (FPGA)...

Nonlinear phenomena in closed-loop pulsewidth modulation (PWM) dc/dc converters have been reported recently. In this paper, we investigate experimentally these phenomena in a voltage-mode controlled buck converter operating in continuous-conduction mode. In particular, the complex behavior of a voltage feedback buck converter is studied for wide variation of input voltage and different load res...

This paper describes a simple-yet-effective for a DC-DC buck converter with voltag (VMC). We propose to use a slope adjustable generator (TWG) which provides a line feed and an additional duty cycle modulatio comparing with the conventional VMC, the p significantly improves the line and load tran This triangular wave slope regulation sc compared to digital feed-forward control sch non-linear ca...

The constant on-time current-mode controlled (COT-CMC) switching dc-dc converter is stable, with no subharmonic oscillation in its current loop when a voltage ripple in its outer voltage loop is ignored. However, when its output capacitance is small or its feedback gain is high, subharmonic oscillation may occur in a COT-CMC buck converter with a proportional-integral (PI) compensator. To inves...

This paper includes investigations of power losses in monolithic buck dc-dc converter designed with Cadence on CMOS 0.35 μm process. Input voltage of the designed circuit is equal to 3.6 V and output voltage is regulated to 1.2 V. Evaluated and estimated are power dissipations in the MOS transistor, filter inductor and filter capacitor of the buck converter. Investigated and compared are losses...

This paper presents an electric drive system whose motor is connected to a battery by means of a buck DC/DC converter. This motor is further connected to an ultracapacitor by means of a boost DC/DC converter. First, operation and break processes are studied when the converters are switched off as well as when they are switched on in current limitation mode. Then, a comparative analysis of the r...

In this paper, sliding mode control (SMC) for a bidirectional buck/boost DC-DC converter (BDC) with constant frequency in continuous conduction mode (CCM) is discussed. Since the converter is a high-order converter, the reduced-order sliding manifold is exploited. Because of right-half-plan zero (RHPZ) in the converter’s duty ratio to output voltage transfer function, sliding mode current...

The novelty of this paper is a hybrid approach for modeling and implementing a real-time control strategy of a dc Servomotor angular speed by using a sliding mode control module. The sliding mode controller is embedded in an open-loop control system structure with a dc Buck converter to stabilize and regulate the converter output voltage, despite the load current changes and unregulated power s...