scholarly journals Design and implementation of multiple output forward converter with Mag-amp and LDO as post regulators for space application

2020 ◽  
Vol 12 (3) ◽  
pp. 43-56
Author(s):  
Soumya Patil ◽  
R.S. Geetha ◽  
B.L. Santosh ◽  
Bhoopendra Kumar Singh ◽  
Vinod Chippalkatti
Keyword(s):  
Input Voltage ◽  
Power Supplies ◽  
Control Technique ◽  
Space Applications ◽  
Feed Forward ◽  
Forward Converter ◽  
Feed Forward Control ◽  
Low Dropout Regulator ◽  
Low Efficiency ◽  
Voltage Feedback

Linear power supplies are commonly used power supplies for many applications. They have some drawbacks such as low efficiency, difficulty in  thermal management and also in regulation of the output voltage. Some of these drawbacks can be overcome by Switch Mode Power Supplies (SMPS). One of the best-suited applications of SMPS is for space applications that require power supplies which are lighter, smaller, more efficient and highly reliable. Multiple-output DC-DC converters are an important topology of SMPS that can be used for space applications. But, in multiple output converters usually, only the master output is regulated and the other outputs are left unregulated and this can result in cross-regulation. In this paper, post regulators such as Magnetic amplifiers (Mag-amp) and Low DropOut regulator (LDO) are proposed to regulate each output and also to improve load regulation. In addition to this, the input voltage feed-forward control technique is proposed to control the duty cycle of the switch, which is dynamically faster and provides better line regulation when compared to the voltage feedback controller. Besides, over current protection circuit for the converter is discussed in detail. Keywords: Cross regulation effect, Mag-amp and LDO, multiple output forward converter, output over current protection, voltage feed forward control.

Feed-Forward Control of Input-Series and Output-Parallel DC Transformer

2013 ◽  
Vol 341-342 ◽  
pp. 791-796
Author(s):  
Xian Jin Zhang ◽  
Bu Gen Wang
Keyword(s):  
Control Method ◽  
Input Voltage ◽  
Duty Ratio ◽  
Feed Forward ◽  
Zero Voltage Switching ◽  
Feed Forward Control ◽  
Good Ability ◽  
Dc Transformer ◽  
Output Filter ◽  
Zero Voltage

The input-series and output-parallel (ISOP) DC transformer, which has no output filter, runs under near 100% duty ratio, and is easily achieve zero voltage switching (ZVS) conditions and higher efficiency, is more and more attractive in the high input voltage and high power applications. In order to achieving input voltages sharing in ISOP DC transformer based on two non-resonant DC transformer modules, the feed-forward control method is proposed in this paper. And the principle of the proposed control is analyzed in detail. Finally, experimental results are given to verify the proposed control method to have a good ability of sharing the input voltages.

scholarly journals A Low-Dropout Regulator with PSRR Enhancement through Feed-Forward Ripple Cancellation Technique in 65 nm CMOS Process

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 146
Author(s):  
Young-Joe Choe ◽  
Hyohyun Nam ◽  
Jung-Dong Park
Keyword(s):  
Maximum Load ◽  
Input Voltage ◽  
Cmos Technology ◽  
Cmos Process ◽  
Feed Forward ◽  
Power Supply Rejection Ratio ◽  
Wide Range ◽  
Low Dropout Regulator ◽  
Ldo Regulator ◽  
Ripple Cancellation

In this paper, a low-dropout (LDO) regulator with an enhanced power supply rejection ratio (PSRR) is proposed with a feed-forward ripple cancellation technique (FFRC) in 65 nm CMOS technology. This technique significantly improves the PSRR over a wide range of frequencies, compared to a conventional LDO regulator. The LDO regulator provides 35–76.8 dB of PSRR in the range of 1 MHz–1 GHz, which shows up to 30 dB of PSRR improvement, compared with that of the conventional LDO regulator. The implemented LDO regulator has a dropout voltage of 0.22 V and a maximum load current of 20 mA. It can also provide an output voltage of 0.98 V at a range of 1–1.3 V of the input voltage. The load regulation is 2.3 mV/mA while the line regulation is 0.05 V/V. The circuit consumes 385 μA with an input voltage of 1.2 V. The total area without pads is 0.092 mm2.

Parametric Study of Damping Characteristics of Magneto-Rheological Damper: Mathematical and Experimental Approach

2020 ◽  
Vol 15 (3) ◽  
pp. 37-48
Author(s):  
Zubair Rashid Wani ◽  
Manzoor Ahmad Tantray
Keyword(s):  
Structural Control ◽  
Research Work ◽  
Testing Machine ◽  
Input Voltage ◽  
Damping Coefficient ◽  
Control Technique ◽  
Damping Force ◽  
Active Devices ◽  
Active Structural Control ◽  
Magneto Rheological

The present research work is a part of a project was a semi-active structural control technique using magneto-rheological damper has to be performed. Magneto-rheological dampers are an innovative class of semi-active devices that mesh well with the demands and constraints of seismic applications; this includes having very low power requirements and adaptability. A small stroke magneto-rheological damper was mathematically simulated and experimentally tested. The damper was subjected to periodic excitations of different amplitudes and frequencies at varying voltage. The damper was mathematically modeled using parametric Modified Bouc-Wen model of magneto-rheological damper in MATLAB/SIMULINK and the parameters of the model were set as per the prototype available. The variation of mechanical properties of magneto-rheological damper like damping coefficient and damping force with a change in amplitude, frequency and voltage were experimentally verified on INSTRON 8800 testing machine. It was observed that damping force produced by the damper depended on the frequency as well, in addition to the input voltage and amplitude of the excitation. While the damping coefficient (c) is independent of the frequency of excitation it varies with the amplitude of excitation and input voltage. The variation of the damping coefficient with amplitude and input voltage is linear and quadratic respectively. More ever the mathematical model simulated in MATLAB was in agreement with the experimental results obtained.

scholarly journals Model-based feed-forward control for time-varying systems with an example for SRF cavities

2020 ◽  
Vol 53 (2) ◽  
pp. 1331-1336
Author(s):  
Sven Pfeiffer ◽  
Annika Eichler ◽  
Holger Schlarb
Keyword(s):  
Time Varying ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Model Based ◽  
Time Varying Systems ◽  
Srf Cavities
Sign in / Sign up

Export Citation Format

Share Document