Design of a radiation hardened PWM controller built on SOI

Kılıç, Emrecan
Design of efficient and compact switch-mode power supplies (SMPS) is a popular topic in power electronics. Silicon has been used as semiconductor material of switches in DCDC converters for decades. However, preference of using GaN as semiconductor material of switches in these topologies has recently increased due to their superior properties. GaN FETs have lower gate capacitance, lower channel resistance, higher frequency operation, higher breakdown voltage and higher temperature operation than silicon MOSFETs. Those properties provide increase in the efficiency of DC-DC converters and reduction in the size of filter components of them. This thesis focuses primarily on developing an efficient DC-DC converter, and secondly a compact converter. Design of a low-power and radiation hardened PWM (Pulse Width Modulation) controller has helped the DC-DC converter in this thesis has a high efficiency. In order to increase efficiency further, GaN devices have been used as switches because they have lower gate capacitance and channel resistance, which means lower switching and conduction losses, than those of silicon MOSFETs. On the other hand, using GaN FETs has enabled working at high frequencies in order to reduce the size of filter components and producing a compact DC-DC converter as required in most of the applications today. The PWM controller has been designed as integrated circuit, manufactured and tested. 0.18 µm SOI (Silicon-On-Insulator) technology has been used throughout the design. The PWM controller is a current mode controller and has internal blocks which are error amplifier, SR latch, clock generator, voltage reference, current sense and inverter. Error amplifier is designed with 83.8° phase margin in order to have a stable DC-DC converter. Clock of the controller is implemented by a ring oscillator with a duty cycle adjustment circuit whose output gives a clock with duty cycle of %32 and frequency up to 10 MHz. Furthermore, it has an external pin through which an external clock signal might be given. A reference voltage of 1.27 V is produced in order to compare it with the output of the current sense block. A delay generation circuit has been designed by using inverters, which provides reduction of switching losses. Experimental results show that the PWM controller is able to drive a GaN FET, whose input capacitance is 588 pF, at 10 MHz. At this condition, the PWM controller is supplied with 5 V, and it has a power dissipation of 15 mW. Efficiency of the DC-DC converter is measured as 83.1% with 3.2 VDC input. The converter also gives 3 VDC output at 100 mA load with 30 VDC input voltage in a closed loop configuration. The circuit shows stable operation under full-load to no-load transition. The PWM controller chip size is 2.5mm x 3mm. The controller is radiation hardened thanks to the internal resistance of SOI technology.


Active clamped ZVS forward converter with soft-switched synchronous rectifier for maximum efficiency operation
Acik, A; Cadirci, I (1998-05-22)
An active-clamped, zero-voltage switched forward converter equipped with a soft-switched synchronous rectifier is designed and implemented for some low output voltage applications where maximized efficiency is of utmost importance. The converter efficiency is maximized due to soft-switching of the main, active clamp and the synchronous rectifier MOSFET switches. Experimental results are presented for a converter with a de input voltage of 48V, an output voltage of 5V and a de electronic load up to 10A. The ...
Modeling and Control of Interleaved Multiple-Input Power Converter for Fuel Cell Hybrid Electric Vehicles
Hegazy, Omar; Van Mierlo, Joeri; Lataire, Philippe (2011-09-10)
Interleaving techniques are widely used to reduce input/output ripples, to increase the efficiency and to increase the power capacity of the DC/DC converters. This paper proposes an interleaved multiple-input power converter (IMIPC) that interfaces the fuel cell and energy storage systems (e.g. Batteries or/and Supercapacitors) to the powertrain of the hybrid electric vehicles. The IMIPC is responsible for the power-flow management on-board vehicle for each operating mode. In this research, the IMIPC is pro...
A Detailed Power Loss Analysis of Modular Multilevel Converter
Erturk, Feyzullah; Hava, Ahmet Masum (2015-03-19)
This paper thoroughly examines the semiconductor power loss characteristics of modular multilevel converters (MMC). Power loss behavior is examined under different pulse width modulation (PWM) methods and operating conditions. The effects of stored energy level, circulating current control utilization, power factor and submodule voltage balancing method on power loss are studied. Furthermore, unbalanced power losses and specific semiconductor stresses within a submodule are visualized by investigating the l...
Output voltage control of a four-leg inverter based three-phase ups by means of stationary frame resonant filter banks
Demirkutlu, Eyyüp; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2006)
A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced loa...
Design and Implementation of a 154-kV +/- 50-Mvar Transmission STATCOM Based on 21-Level Cascaded Multilevel Converter
Gultekin, Burhan; Gercek, Cem Ozgur; Atalik, Tevhid; Deniz, Mustafa; Bicer, Nazan; Ermiş, Muammer; Kose, Kemal Nadir; Ermis, Cezmi; Koc, Erkan; Cadirci, Isik; Acik, Adnan; Akkaya, Yener; Toygar, Hikmet; Bideci, Semih (2012-05-01)
In this research work, the design and implementation of a 154-kV +/- 50-Mvar transmission static synchronous compensator (T-STATCOM) have been carried out primarily for the purposes of reactive power compensation and terminal voltage regulation and secondarily for power system stability. The implemented T-STATCOM consists of five 10.5-kV +/- 12-Mvar cascaded multilevel converter (CMC) modules operating in parallel. The power stage of each CMC is composed of five series-connected H-bridges (HBs) in each phas...
Citation Formats
E. Kılıç, “Design of a radiation hardened PWM controller built on SOI,” M.S. - Master of Science, Middle East Technical University, 2018.