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This paper presents a sensorless digital controller method that is able to detect the switching power converter's inductor current zero-crossing point and operate in discontinuous conduction mode without the need for sensing the inductor current. The presented controller is based on minimizing the duty cycle of the upper side switch of the DC-DC buck power converter while perturbing the lower side...
This paper presents a hybrid switching scheme for LLC series-resonant half-bridge (SRHB) dc-dc converter. The concept of the proposed hybrid switching scheme is changing the switching mode to improve power efficiency in a wide load range. The SRHB converter operates in three different switching modes depending on the output load condition. Digital control of the system facilitates the implementation...
This paper presents a new low-cost digital control solution that maximizes the AC/DC flyback power supply efficiency. This intelligent digital approach achieves the combined benefits of high performance, low cost and high reliability in a single controller. It introduces unique multiple PWM and PFM operational modes adaptively based on the power supply load changes. While the multi-mode PWM/PFM control...
This paper presents an oversampled digital controller IC for low-power switch-mode power supplies (SMPS) that achieves fast response with a minimized addition of switching losses due to its control actions. To reduce the voltage deviation and improve converter response time, the controller samples the output voltage four times per switching cycle. A single voltage sample is processed by the conventional...
To benefit the parallel current balancing, a novel digital control strategy, i.e., the current following control, is put forward. A current following control based Buck DC-DC converter-group is described. The main controller collect the output voltage and the output current in the real time, based on which, the desired output current for each Buck DC-DC converter is worked out and transferred to the...
A novel control method used in the half-bridge single-state power converter is presented in this paper. This proposed control scheme is to enlarge load regulation range in discontinuous conduction mode (DCM), while the new duty pattern will be derived to perform the variable-frequency control. Compared to the conventional control methods, the proposed duty cycle pattern within a switching period is...
A new digital control strategy of parallel duty cycle control (PDC) for power factor correction (PFC) is presented and analyzed in this paper. Based on this new control strategy, the duty cycle determination algorithm includes the current term and the voltage term, which can be calculated in parallel and requires only one multiplication and three additions or subtractions operations in digital implementation...
This paper proposes a novel implementation of an FPGA-Based controller for conducted-noise reduction in dc-dc converters. The switching noise produced by the converter has been reduced by randomly varying the switching frequency of the converter. Traditionally, the implementation of the switching-mode power supply (SMPS) has been accomplished using analog control circuits. However, the field-programmable...
In this paper analysis and digital controller design for digital voltage-mode controlled higher order boost converter (HOBC) is presented. The state-space averaging method is applied to formulate the small-signal models; valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed...
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