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Battery-supercapacitor hybrid energy storage systems are becoming popular in the renewable energy sector due to their improved power and energy performances. These hybrid systems require separate dc-dc converters, or at least one dc-dc converter for the supercapacitor bank, to connect them to the dc-link of the grid interfacing inverter. These additional dc-dc converters increase power losses, complexity...
This paper describes a combined Pulse Width Modulation (PWM)-Pulse Frequency Modulation (PFM) technique implemented in a Field Programmable Gate Array (FPGA) to control DC-DC converters. This technique changes the mode of operation from PWM to PFM with the change in the load condition. The efficiency of the proposed technique is determined by implementing a DC-DC converter and calculating the conduction...
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...
In this paper, the chip designs of analog pulsewidth modulation (PWM) and digital PWM are developed and implemented for switching power converters. This research employed analog and digital PWM technology to design the DC/DC converter control system. The advantages and disadvantages between these two architectures are treated in this paper. The key circuits of analog PWM controller IC are two-stage...
Boost inverter is able to generate an AC voltage whose peak value can be larger or smaller than the DC input voltage in a single stage. The boost inverter consists of two individual boost DC-DC converters. Each of the boost DC-DC converters has to be controlled in variable operating point condition. This paper proposes two voltage mode controllers. First one is conventional feedback controller based...
This paper addresses quantization noise shaping using sigma-delta (SigmaDelta) modulators in switched-mode power converters with digital pulse-width modulation (DPWM). It is shown that the SigmaDelta modulator design must take into account the effects of idle tones and DPWM nonlinearities, as well as the converter switching frequency and output filter constraints. Best results are obtained using 2...
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