scholarly journals Parametric Analysis of Automotive Grade Buck Converters

2021 ◽  
Vol 23 (06) ◽  
pp. 395-401
Author(s):  
Vajra R Singh ◽  
◽  
Sindhu Rajendran ◽  
Keyword(s):  
Power Systems ◽  
Parametric Analysis ◽  
Input Voltage ◽  
Buck Converter ◽  
Buck Converters ◽  
Output Current ◽  
System A ◽  
Constant Output ◽  
Design Characteristics ◽  
Lower Voltage

The current power system design in electric automobiles has become increasingly complicated due to innumerable electronics which are required to be integrated for the effective functioning of the system. A DC/DC buck converter is primarily used in order to control and regulate the working of peripheral systems in an automotive, the voltage from the battery is stepped down in order to power systems like the USB ports and the dashboard interfaces. There are multiple regulators available but in order to assess the feasibility of the available IC’s to the interface, the design characteristics and specifications require stepping down the input voltage from a higher voltage to produce a requirement specific lower voltage and constant output current in amperes. A comprehensive parametric analysis of LM23625 and LM23630 is performed by simulating buck regulators operating at respective switching frequencies.

scholarly journals PENGISIAN AKI DENGAN BUCK CONVERTER

2013 ◽  
Vol 5 (1) ◽  
pp. 29-34
Author(s):  
Yul Antonisfia ◽  
Era Madona
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Input Voltage ◽  
Buck Converter ◽  
Flow Sensor ◽  
Voltage Output ◽  
Charging Current ◽  
Lower Voltage

Buck converter is one of DC chopper which has the function of stabilizing the voltage to lower voltage where the output voltage is lower than the input voltage without having to remove power is relatively large. By using a buck converter is a high voltage can be reduced to lower as you wish without losing power is relatively large. The voltage output of the buck converter is able to charge the battery. The magnitude of the output voltage depends dutycyle switching generated by the microcontroller. This tool is also equipped with a flow sensor is used to detect the charging current into the battery. If the charging current is reduced, the buzzer will sound. The tool is based microcontrollers using BASCOM ATMEGA8535, which can generate a PWM with dutycyle specified. Dutycyle determined the size of the input voltage and the desired output.

scholarly journals Dynamic analysis of the input-controlled buck converter fed by a photovoltaic array

2008 ◽  
Vol 19 (4) ◽  
pp. 463-474 ◽  
Author(s):  
Marcelo Gradella Villalva ◽  
Ernesto Ruppert Filho
Keyword(s):  
Dynamic Analysis ◽  
Output Voltage ◽  
Input Voltage ◽  
Buck Converter ◽  
Special Situation ◽  
Photovoltaic Array ◽  
Photovoltaic Applications ◽  
Constant Output

The control of the input voltage of DC-DC converters is frequently required in photovoltaic applications. In this special situation, unlike conventional converters, the output voltage is constant and the input voltage is controlled. This paper deals with the analysis and the control of the buck converter with constant output voltage and variable input.

scholarly journals Adaptive Power Charge Using PID Controller on DC Load Application

2021 ◽  
Vol 7 (2) ◽  
pp. 138
Author(s):  
Farid Dwi Murdianto ◽  
Indhana Sudiharto ◽  
Irianto Irianto ◽  
Ayu Wulandari
Keyword(s):  
Energy Storage ◽  
Output Voltage ◽  
Electric Energy ◽  
Electrical Energy ◽  
Input Voltage ◽  
Buck Converter ◽  
Charge System ◽  
Electric Energy Storage ◽  
System A ◽  
Adaptive Power

Battery is a very important necessity as an electrical energy storage for DC load type. However, as electric energy storage, the battery has a limit storage capacity. The battery must be recharged when the electrical energy stored in the battery has been exhausted to keep the DC load in operation. Unfortunately, batteries in different types of DC loads have different voltages and capacities. So for charging the battery also requires a different voltage. While the existing battery charger is generally static specifically for one type of battery. From this problem, the paper proposed an adaptive power charge system. A system that can adaptively charge electrical energy on batteries that have different voltages and capacities through one port. The converter used in this paper is the buck converter to lower the output voltage from the input voltage. The system uses tracking duty cycle to know the type of DC load. After knowing the type of dc load then the system determines the setting point voltage. To keep the output voltage stable, the system uses PID control. With this adaptive power charge, the charging process will be more efficient and multifunction because it can be used for various types of DC load. The system can provide an output voltage of 19 volts when connected to a laptop and provides an output voltage of 5 volts when connected to a mobile phone on setling time 10ms.

Markov Chain Modeling for Reliability Analysis of Multi-Phase Buck Converters

2019 ◽  
Vol 29 (09) ◽  
pp. 2050139 ◽  
Author(s):  
Elias Shokati Asl ◽  
Mehran Sabahi ◽  
Mehdi Abapour ◽  
Alireza Eyvazizadeh Khosroshahi ◽  
Hossein Khoun-Jahan
Keyword(s):  
Electromagnetic Interference ◽  
Buck Converter ◽  
Buck Converters ◽  
Time To Failure ◽  
Output Current ◽  
Fast Transient Response ◽  
Comprehensive Comparison ◽  
Multi Phase ◽  
Mean Time ◽  
Current Ripple

In recent years, the structure of multi-phase buck converter also called Interleaved Buck Converter (IBC) has gained considerable attention. The advantages of the IBC in comparison to the conventional Buck converter (CBC) are the lower output current ripple, higher efficiency, fast transient response, lower electromagnetic interference and higher reliability. Since more than one stage is employed in the IBC, this converter is highly reliable. In this paper, the reliability and mean time to failure (MTTF) of the CBC, and two- and three-stage IBCs are figured out. Using the obtained results and considering various scenarios, a comprehensive comparison is provided. In addition, the operation of the converter in case of fault occurrence for high and low capacities is analyzed and reliability is evaluated in each state. The relation between the reliability and temperature of semiconductor elements is discussed. Furthermore, a laboratory-scaled prototype is used to extract the experimental results of the temperature variation of the elements during a fault. Markov model is used to evaluate the analyzed reliability.

Electrolytic Capacitorless AC/DC LED Driver

2019 ◽  
Vol 28 (12) ◽  
pp. 1950200
Author(s):  
Changyuan Chang ◽  
Xiong Han ◽  
Menglin Wu ◽  
Dadi Zhao ◽  
Hongliang Xu
Keyword(s):  
Input Voltage ◽  
Buck Converter ◽  
Electrolytic Capacitor ◽  
Conduction Time ◽  
Test Results ◽  
Led Driver ◽  
Power Difference ◽  
Load Regulation ◽  
Constant Output ◽  
Conduction Mode

This paper presents electrolytic capacitorless AC/DC LED driver. It adopts Boost–Buck topology, through modulation of the conduction time [Formula: see text] and the change of input current reference, to reduce the instantaneous input and output power difference, so a smaller film capacitor can be used instead of the electrolytic capacitor. Therefore, LED driver power life has been effectively improved. The Buck converter operates in the inductor current discontinuous conduction mode to achieve constant output current by controlling the peak current. The control IC is fabricated in TSMC 0.35-[Formula: see text]m 5-V/650-V CMOS/LDMOS process, and verified in a 72-V/150-mA circuit prototype. The test results show that when the range of input voltage is 175–264 Vac, the efficiency of the system is 83%, the voltage linear regulation is [Formula: see text]%, the load regulation is [Formula: see text]%, and the electrolytic capacitor is replaced by 470-nF CBB capacitor under the condition that the power factor is above 0.7. Therefore, the design of the control chip in the LED driver has a very good application prospect.

Design and Control for the Buck-Boost Converter Combining 1-Plus-D Converter and Synchronous Rectified Buck Converters

2015 ◽  
Vol 6 (2) ◽  
pp. 305
Author(s):  
Jeevan Naik
Keyword(s):  
Output Voltage ◽  
Input Voltage ◽  
Boost Converter ◽  
Buck Converter ◽  
Voltage Source ◽  
Buck Converters ◽  
Power Switches ◽  
Output Capacitor ◽  
And Control ◽  
Conduction Mode

<span>In this paper, a design and control for the buck-boost converter, i.e., 1-plus-D converter with a positive output voltage, is presented, which combines the 1-plus-D converter and the synchronous rectified (SR) buck converter. By doing so, the problem in voltage bucking of the 1-plus-D converter can be solved, thereby increasing the application capability of the 1-plus-D converter. Since such a converter operates in continuous conduction mode inherently, it possesses the nonpulsating output current, thereby not only decreasing the current stress on the output capacitor but also reducing the output voltage ripple. Above all, both the 1-plus-D converter and the SR buck converter, combined into a buck–boost converter with no right-half plane zero, use the same power switches, thereby causing the required circuit to be compact and the corresponding cost to be down. Furthermore, during the magnetization period, the input voltage of the 1-plus-D converter comes from the input voltage source, whereas during the demagnetization period, the input voltage of the 1-plus-D converter comes from the output voltage of the SR buck converter.</span>

scholarly journals A New GaN-Based Device, P-Cascode GaN HEMT, and Its Synchronous Buck Converter Circuit Realization

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3477
Author(s):  
Chih-Chiang Wu ◽  
Ching-Yao Liu ◽  
Guo-Bin Wang ◽  
Yueh-Tsung Shieh ◽  
Wei-Hua Chieng ◽  
...  
Keyword(s):  
Low Voltage ◽  
Circuit Complexity ◽  
Input Voltage ◽  
Buck Converter ◽  
Maximum Output ◽  
High Current ◽  
Output Current ◽  
Circuit Realization ◽  
Gan Hemt ◽  
Gate Driver

This paper attempts to disclose a new GaN-based device, called the P-Cascode GaN HEMT, which uses only a single gate driver to control both the D-mode GaN and PMOS transistors. The merit of this synchronous buck converter is that it can reduce the circuit complexity of the synchronous buck converter, which is widely used to provide non-isolated power for low-voltage and high-current supply to system chips; therefore, the power conversion efficiency of the converter can be improved. In addition, the high side switch using a single D-mode GaN HEMT, which has no body diode, can prevent the bi-directional flow and thus reduce the power loss and cost compared to a design based on a series of two opposite MOSFETs. The experiment shows that the proposed P-Cascode GaN HEMT efficiency is above 98% when it operates at 500 kHz with 6 W output. With the input voltage at 12 V, the synchronous buck converter provides an adjustable regulated output voltage from 1.2 V to 10 V while delivering a maximum output current of 2 A.

scholarly journals Stacked Buck Converter: Current Ripple Elimination Effect and Transient Response

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 64
Author(s):  
Chien-Chun Huang ◽  
Yu-Chen Liu ◽  
Chia-Ching Lin ◽  
Chih-Yu Ni ◽  
Huang-Jen Chiu
Keyword(s):  
Transient Response ◽  
Dead Time ◽  
Control Method ◽  
Buck Converter ◽  
Modulation Method ◽  
Output Current ◽  
Time Modulation ◽  
Advantages And Disadvantages ◽  
Improvement Method ◽  
Current Ripple

To balance the cost and volume when applying a low output current ripple, the power supply design should be able to eliminate the current ripple under any duty cycle in medium and high switching frequencies, and considerably reduce filter volume to improve power density. A stacked buck converter was eventually selected after reviewing the existing solutions and discussing their advantages and disadvantages. A stacked buck converter is used as a basis to propose the transient response and output current ripple elimination effect, boundary limit control method, and low output ripple dead time modulation method to make individual improvements. The principle, mathematical derivation, small-signal model, and compensator design method of the improvement method are presented in detail. Moreover, simulation results are used to mutually verify the correctness and effectiveness of the improvement method. A stacked buck converter with 330-V input, 50-V output, and 1-kW output power was implemented to verify the effect of the low output current ripple dead time modulation. Experimental results showed that the peak-to-peak value of the output current ripple was reduced from 2.09 A to 559 mA, and the RMS value was reduced from 551 mA to 91 mA, thereby effectively improving the output current ripple.

Controller for a reduced output current ripple DC-DC buck converter

2015 ◽  
Author(s):  
Jose M. Sosa ◽  
P.R. Martinez-Rodriguez ◽  
G. Escobar ◽  
J.C. Nava-Cruz ◽  
C.A. Limones-Pozos
Keyword(s):  
Buck Converter ◽  
Output Current ◽  
Current Ripple

COMPLEX DYNAMICS AND FAST-SLOW SCALE INSTABILITY IN CURRENT-MODE CONTROLLED BUCK CONVERTER WITH CONSTANT CURRENT LOAD

2013 ◽  
Vol 23 (04) ◽  
pp. 1350062 ◽  
Author(s):  
GUOHUA ZHOU ◽  
BOCHENG BAO ◽  
JIANPING XU
Keyword(s):  
Complex Dynamics ◽  
Period Doubling ◽  
Current Mode ◽  
Input Voltage ◽  
Second Order ◽  
Buck Converter ◽  
Constant Current ◽  
Current Load ◽  
Time Model ◽  
Conduction Mode

The complex dynamics and coexisting fast-slow scale instability in current-mode controlled buck converter with constant current load (CCL), operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), are investigated in this paper. Via cycle-by-cycle computer simulation and experimental measurement of current-mode controlled buck converter with CCL, it is found that a unique fast-slow scale instability exists in the second-order switching converter. It is also found that a unique period-doubling accompanied by Neimark–Sacker bifurcation exists in this simple second-order converter, which is different from period-doubling or Neimark–Sacker bifurcations reported previously. Based on a nonlinear discrete-time model and the corresponding Jacobian, the effects of CCL and input voltage on the dynamics of current-mode controlled buck converter are investigated and verified theoretically. Fixed point analysis for slow-scale low-frequency oscillation is also given to verify the dynamics and the coexisting fast-slow scale instability.

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