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DC-DC Converters
Published in Timothy L. Skvarenina, The Power Electronics Handbook, 2018
Richard Wies, Bipin Satavalekar, Ashish Agrawal, Javad Mahdavi, Ali Agah, Ali Emadi, Daniel Jeffrey Shortt
In DC-DC converters the output voltage ripple is a measure of the deviation in the output voltage from the average value. The peak-to-peak voltage ripple for the buck converter in Figure 2.16 for the continuous conduction mode can be calculated for a specified value of output capacitance by calculating the additional charge DQ provided by the ripple current in the inductor. This analysis assumes that all of the ripple current flows through the capacitor, while the average value of the inductor current flows through the load resistor. The peak-to-peak voltage ripple is calculated by taking the area under the inductor current iL (the additional charge DQ) and dividing by the capacitance resulting in Equation 2.12 [2]:
Chopper
Published in Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal, Power Electronics, Drives, and Advanced Applications, 2020
Vinod Kumar, Ranjan Kumar Behera, Dheeraj Joshi, Ramesh Bansal
It is defined as the ratio of AC ripple voltage to average output voltage. () ∴RF=VrV0=1−δδ=1δ−1
Power Supplies and PSRR
Published in Douglas Self, Audio Power Amplifier Design, 2013
For amplifiers of moderate power the total reservoir capacitance per rail usually ranges from 4700 to 20,000 uF, though some designs have much more. Ripple current ratings must be taken seriously, for excessive ripple current heats up the capacitors and reduces their lifetime. It is often claimed that large amounts of reservoir capacitance give ‘firmer bass’, presumably following the same sort of vague thinking that credits regulated power supplies with giving ‘firmer bass’, but it is untrue for all normal amplifier designs below clipping.
Implementation of Incremental Conductance MPPT Algorithm with Integral Regulator by Using Boost Converter in Grid-Connected PV Array
Published in IETE Journal of Research, 2023
Muhammad Abu Bakar Siddique, Adeel Asad, Rao M. Asif, Ateeq Ur Rehman, Muhammad Tariq Sadiq, Inam Ullah
Boost converter keeps the output power of the PV system constant by stepping up input voltage stepping down photocurrent by keeping the power constant on the input and output side. It is a member of the switched-mode power supply’s family which consists of a diode, transistor, capacitor, and inductor. Sometimes, filters are added on the load side and supply side for reducing ripple voltage. The ratio between the source voltage and output voltage or the ratio between on-time of MOSFET and switching period. In all DC to DC converters the output voltage and duty ratio have some function relation with efficiency. For this type of converter, the duty ratio (D) can be calculated using the following equation.
Buck-Boost AC-DC LED Driver for Lamp with Visible Light Communication Module
Published in Electric Power Components and Systems, 2019
Sin-Woo Lee, Duck-Ju Lee, Seong-Ho Lee, Hyun-Lark Do
Because an input power is directly transferred to Cdc, the ripple frequency of Cdc is two times the input line frequency fL. Therefore, the capacitance of Cdc should be large enough to alleviate the ripple of the output voltage ΔVdc. The minimum capacitance of Cdc can be obtained from the following equation: By substituting Po=10 [W], fL =60 [Hz], ΔVdc=1 [V], VLED=36 [V], and Dm= 0 (a full load condition, no data) in (13), Cdc>1150 [μF].
Independent active–reactive power control scheme for NSC-drive operated at constant frequency
Published in EPE Journal, 2020
Chaitanya N Jibhakate, Madhuri A Chaudhari, Mohan M Renge
The dc-link capacitor must be designed considering allowable voltage ripple, power rating of the converter and the dc-link voltage. The voltage ripple is due to the high-frequency component of dc current of the converter. The dc-link capacitor must sustain the desired power demand. If all the switches are turned off, the inductor energy flows in the capacitor, increasing dc-link voltage amplitude [19]. The size of the decoupling dc-link capacitor is given by: