Ultra-Wide Output Voltage Range DC Power Supply with Multiple Power Modules Series/Parallel Variable Structure and Automatic Voltage/Current Sharing

2019 ◽  
Author(s):  
Mengxi Li ◽  
Hongfei Wu ◽  
Chengzhi Qu ◽  
Yuhui Ji ◽  
Yangjun Lu ◽  
...  
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Variable Structure ◽  
Voltage Range ◽  
Current Sharing ◽  
Dc Power ◽  
Power Modules ◽  
Multiple Power ◽  
Dc Power Supply

Improvement Strategy of Load Regulation of Boosting Power Supply Based on PID Algorithm

2015 ◽  
Vol 740 ◽  
pp. 261-264
Author(s):  
Sheng Zhang ◽  
Pei Zheng Li ◽  
Zhi Wei Chen
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Voltage Divider ◽  
Input Voltage ◽  
The Other ◽  
Improvement Strategy ◽  
Pid Algorithm ◽  
Dc Power ◽  
Load Regulation ◽  
Dc Power Supply

As one of the most important parameters of Direct Current (DC) power supply, Load regulation determines the performance of whole system. In this paper, the internal structure as well as performance parameters of LM2577 boosting converter were deeply investigated and based on this investigation we proposed two new methods of improving its Load Regulation. One method (method 1) is to replace the resistor connected to the feedback pin of LM2577 with a programmable potentiometer and sample the variation of output voltage using an AD converter. The potentiometer is adjusted under the control of feedback algorithm to keep the output voltage stable, thus the load regulation enhanced. In the other method (method 2), the feedback pin of LM2577 is connected to an adder to stabilize the output voltage of DC power supply and increase the load regulation. A voltage divider made up of resistors divides the output voltage and provide the divided voltage to one input of the adder. The other adder input comes from DA converter controlled by microcontroller. To reduce the adjust time and increase the efficiency, PID algorithm is applied in the software part of the system. We use 12-bit AD (ADS1115), 12-bit DA (TLV 5638) and 10-bit programmable potentiometer (AD5293) to test the methods above under the condition of 5V input voltage and 600mA load current. When output is set to 7V, the load regulation is improved from 1.043%, the rate from application circuit in LM2577’s Datasheet, to 0.700% and 0.042% by applying the first and second method, respectively. When output voltage equals 12V, the improvement is from 0.658% to 0.008% and 0.008%. Meanwhile, the method 2 suppresses output voltage ripple to be less than 10mV.

scholarly journals A Stable DC Power Supply for Photovoltaic Systems

2015 ◽  
Vol 12 (1) ◽  
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Electrical Power ◽  
Input Voltage ◽  
Photovoltaic Systems ◽  
Pv System ◽  
Pv Systems ◽  
Dc Power ◽  
Voltage Output ◽  
Dc Power Supply

The use of solar energy as source of power is becoming not a choice but a necessity due to the unprecedented growth in the demand and consumption of electrical power for various applications. The solar power from the Photovoltaic (PV) systems is currently used as a standalone PV system or integrated with the electric grid. However, the generated DC power from PV systems is not stable due to weather, atmospheric and environmental conditions, which requires the design of a DC power supply to produce a stable and regulated DC voltage output. In this paper, a new design of power supply is presented that provides a stable output voltage (Vout = +12 V, 0 V, -12V) over significant range of input voltage variations (Vin = +15 V to +50 V) emulating the variation of output voltage of PV systems. The stabilization of the output voltage reflects the effectiveness of the proposed design for photovoltaic systems applications. The system is simulated using NI-MULTISIM software. A satisfactory simulation result is obtained showing a strong promise to practically implement using discrete components.

scholarly journals Methods and means of increasing the reliability of computerized modular uninterruptible power supply system

2020 ◽  
Vol 99 (3) ◽  
pp. 133-141
Author(s):  
A. Palamar
Keyword(s):  
Control System ◽  
Simulation Model ◽  
Power Supply ◽  
Control Logic ◽  
Uninterruptible Power Supply ◽  
Dc Power ◽  
Power Modules ◽  
Simulation Results ◽  
Dc Power Supply ◽  
Uninterruptible Power

The problem of development and implementation of a simple and effective method of the rectifiers operation control for the modular uninterruptible DC power supply unit in order to increase its reliability is considered in this paper. The main idea of the method is to control the process of cyclic shifting of the switched-on power modules of the uninterruptible power supply by series switching into operation of each subsequent module from their unloaded reserve and switching out the previous one. The paper presents the control system structure where in addition to the central control module, it is proposed to add the control unit for power modules, which is responsible for implementing the process of their switching on and monitors their condition. In order to investigate the effectiveness of the proposed method, computer simulation model describing the power modules control logic is developed. The Simulink visual modeling environment and the mathematical tools of the Stateflow library component using state and transition diagrams are used in order to develop the simulation model. The developed simulation model is tested and the simulation results are given in the form of time diagrams of state change. The іmplementation of the developed method, due to the uniform reduction of the period during which the power modules of the uninterruptible power supply are on the switched-on loaded state, makes it possible to increase their operating time to failure, which in turn increases its reliability without deteriorating energy efficiency. The simulation results demonstrate the efficiency of the developed algorithm in various system operation modes. Based on the proposed method, hardware and software which is implemented as a part of intelligent computerized control system for uninterruptible DC power supply is created.

Research of Current-Sharing Control Strategy of Parallel PEMFC DC Power Supply System

2014 ◽  
Vol 694 ◽  
pp. 173-178
Author(s):  
Lei Xu ◽  
Ye Xu ◽  
Jin Quan Wang ◽  
Jian Hua Fang ◽  
Shan Luo
Keyword(s):  
Power Supply ◽  
Proton Exchange Membrane ◽  
Power Supply System ◽  
Supply System ◽  
Proton Exchange ◽  
Current Sharing ◽  
Dc Power ◽  
Dc Power Supply ◽  
Set Up ◽  
Exchange Membrane

For the problems of different parameters PEMFC (Proton Exchange Membrane Fuel Cell) applied to dc micro-grid at the same time, the basic framework of two parallel PEMFC dc power supply system was put forward in this paper, meanwhile, the characteristics of this system was analyzed. For the problem of branch current distribution of parallel system, this paper set up the small signal mathematical model of BUCK connected in parallel, designed the control circuit of current-sharing of this system. Finally ,the simulation experiments verified the accuracy and rapidity of current sharing and the reliability and stability of this system, when the sub-circuit was fault.

Sign in / Sign up

Export Citation Format

Share Document