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Investigate and simulate dcdc buck regulator by using ltspice

Investigate and simulate dcdc buck regulator by using ltspice / Mohd Sharimin Rashid

Abstract Penulisan ini membentangkan reka bentuk dan simulasi terhadap DC/DC penukar rendah dengan menggunakan perisian LTspice. Penukar rendah ini adalah penukar yang mampu menurunkan voltan tinggi yang masuk ke litar kepada produk voltan yang lebih rendah. Pulse Width Modulation (PWM) dengan kitar tugas yang tetap untuk memacu suis penukar. Daripada menggunakan penukar rendah yang biasa, projek ini telah menggantikan diod biasa kepada diod Schottky yang berada dilam litar penukar rendah. Kadar upaya minima saiz induktor dan upaya minima kapasitor telah diambil kira tanpa menjejaskan upaya sirkit. Penukar rendah telah dihasilkan dengan hasil gabungan komparator,rujukan voltan, SMPS dan voltan tanjakan. Setiap litar kecil di simulasi berasingan dan seterusnya secara menyeluruh. Penulisan juga membentangkan hasil simulasi dan diskusi di Chapter 4 di mana berkenaan dengan aspek-aspek teori. Hasil simulasi menunjukkan DC/DC penukar rendah mampu mengekalkan load current di paras 1mA dan voltan keluar di 1.32V dalam linkungan voltan masuk dari 1.4V sehingga ke 6V. Kecekapan litar mengikut had voltan masuk adalah lebih dari 70%. _______________________________________________________________________________________________________ This paper presents an investigation and simulation of DC/DC buck converter by using LTspice. Buck converter is a converter that is capable of lowering input voltage as an output voltage. Pulse Width Modulation (PWM) signal with constant duty cycle to drive the switch of the converter. Instead of using the conventional buck converter, this project will replace the normal diode to Schottky’s diode and SMPS. The minimum size of inductor is calculated and the minimum value for the capacitor is calculated and simulated without affecting the circuit overall performance. The buck converter are made of several sub circuit such as comparator, voltage reference, SMPS and ramp voltage. Every sub-circuit are simulated separately and then as a whole. The author also present the simulation results and discussion (in Chapter 4) related to the theoretical aspects. Results shows that the DC/DC buck converter is able to maintain its load current at 1mA and load voltage of 1.32V at input voltage of 1.4V to 6V. The efficiency of the circuit according to the given limit of input voltage is more than 70%.

Contributor(s): Mohd Sharimin Rashid - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875007694 Language: English Subject Keywords: investigation; DC/DC buck converter; LTspice First presented to the public: 6/1/2018 Original Publication Date: 8/10/2018 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Electrical & Electronic Engineering Citation: Extents: Number of Pages - 74 License Grantor / Date Granted:   / ( View License ) Date Deposited 2018-08-13 17:01:24.143 Date Last Updated 2019-01-07 11:24:32.9118 Submitter: Mohd Jasnizam Mohd Salleh

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