A low-voltage low-noise DC-DC flyback converter with delta-sigma modulation

Author

Hwang, Bo-Han ; Yo, Jay-Ann ; Chen, Jiann-Jong ; Hwang, Yuh-Shyan ; Yu, Cheng-Chieh

Author_Institution

Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan

fYear

2012

fDate

20-23 May 2012

Firstpage

2251

Lastpage

2254

Abstract

Comparing with buck-boost converter, flyback converter has positive output voltage in switching mode converters, therefore, flyback converter is easier to supply voltage for the rear-end application circuit. The delta-sigma modulator takes important advantage of the noise-shaping and oversampling properties to eliminate the spike in DC-DC flyback converter. Also, comparing with pulse width modulation (PWM), the proposed two-order delta-sigma (ΔΣ) modulator has strong ability of improving the noise rejection in switch-mode converters. It supplies more steady energy to sensitive circuits such as audio amplifier or power amplifier. Because of low-voltage design, the inverter-based operational amplifier is proposed in this work, which can keep operational amplifier good performance. The input voltage of the proposed circuit is 1.5V, and the range of output voltage is from 1V to 3.3V. The chip area is 2.24 × 2.24 mm².

Keywords

DC-DC power convertors; PWM invertors; delta-sigma modulation; low-power electronics; operational amplifiers; switching convertors; PWM; audio amplifier; buck-boost converter; inverter-based operational amplifier; low-voltage low-noise DC-DC flyback converter; noise rejection; noise-shaping; oversampling property; power amplifier; pulse width modulation; rear-end application circuit; spike elimination; switching mode converter; two-order ΔΣ modulator; two-order delta-sigma modulator; voltage 1 V to 3.3 V; Clocks; Modulation; Noise; Noise shaping; Operational amplifiers; Power transistors; Switches; Flyback converter; delta-sigma modulator;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2012 IEEE International Symposium on

Conference_Location

Seoul

ISSN

0271-4302

Print_ISBN

978-1-4673-0218-0

Type

conf

DOI

10.1109/ISCAS.2012.6271741

Filename

6271741