scholarly journals Voltage Control for DC-DC Converters

2018 ◽  
Author(s):  
Usman Rahat ◽  
Abdul Basit ◽  
Muhammad Salman
Keyword(s):  
Operational Amplifier ◽  
Output Voltage ◽  
Control Method ◽  
Voltage Control ◽  
Feedback System ◽  
Buck Converter ◽  
Load Current ◽  
Cuk Converter ◽  
Conduction Mode ◽  
Continuous Conduction Mode

In this paper, we discuss voltage control method for buck converter operating in continuous conduction mode (CCM) using analog feedback system. The aim of this work is to control the output voltage of a buck converter during the variation in load current. This is obtained using analog feedback made with operational amplifier (Opamp). However, the same technique can be applied to other DC-DC converters (e.g boost, buck-boost, cuk converter, etc) in CCM mode, but for the purpose of analysis buck converter is chosen as an example.

scholarly journals Efficiency of Synchronous and Asynchronous Buck-Converter at Low Output Current.

2019 ◽  
Vol 27 (2) ◽  
pp. 194-206
Author(s):  
Ismael Khaleel Murad
Keyword(s):  
Duty Cycle ◽  
Buck Converter ◽  
Voltage Regulator ◽  
Switching Frequency ◽  
Output Current ◽  
Load Current ◽  
Small Load ◽  
Step Down ◽  
Conduction Mode ◽  
Continuous Conduction Mode

In this paper both synchronous and asynchronous buck-converter were designed to work in continuous conduction mode “CCM” and to deliver small load current. Then the two topologies were tested in terms of efficiency at small load current by use of  different values of switching frequencies (range from 150 KHz to 1MHz) and three separated values of duty-cycle (0.4, 0.6 and 0.8).   Obtained results turns out that efficiency of both synchronous and asynchronous buck-converter “switching step-down voltage regulator” responds in a negative manner to the increase in the switching frequency. However, this impact is being stronger in synchronous topology because of magnifying effect of losses related to switching frequency compared to those related to conduction when working at small load currents; this behavior makes obtained efficiency of both topologies in convergent levels when they operated to deliver small output current especially when working with higher switching frequencies. Larger duty-cycle can rise up the efficiency of both topologies.

Output voltage control method of PWM-controlled cycloconverters with space vectors

1991 ◽  
Vol 111 (5) ◽  
pp. 117-126 ◽  
Author(s):  
Akio Ishiguro ◽  
Takeshi Furuhashi ◽  
Shigeru Okuma ◽  
Yoshiki Uchikawa ◽  
Muneaki Ishida
Keyword(s):  
Output Voltage ◽  
Control Method ◽  
Voltage Control ◽  
Space Vectors

scholarly journals A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 856
Author(s):  
Jing-Yuan Lin ◽  
Yi-Chieh Hsu ◽  
Yo-Da Lin
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Output Voltage ◽  
Buck Converter ◽  
Circuit Board ◽  
System Stability ◽  
Maximum Efficiency ◽  
Load Current ◽  
Voltage Range ◽  
Switching Regulators

In this paper, a triangular spread-spectrum mechanism is proposed to suppress the electromagnetic interference (EMI) of a DC-DC buck converter. The proposed triangular spread-spectrum mechanism, which is implemented in the chip, can avoid modifying the printed circuit board of switching regulators. In addition, a lower ripple of output voltage of switching regulators and a better system stability can be realized by the inductive DC resistance (DCR) current sensing circuit. The chip is fabricated by using TSMC 0.18-μm 1P6M CMOS technology. The chip area including PADs is 1.2 × 1.15 mm2. The input voltage range is 2.7~3.3 V and the output voltage is 1.8 V. The maximum load current is 700 mA. The off-chip inductor and capacitor are 3.3 μH and 10 μF, respectively. The experimental results demonstrate that the maximum spur of the proposed DC-DC buck converter with the triangular spread-spectrum mechanism improves to 14dBm. Moreover, the transient recovery time of step-up and step-down loads are both 5 μs. The measured maximum efficiency is 94% when the load current is 200 mA.

scholarly journals Low-frequency oscillation of continuous conduction mode buck converter with pulse skipped modulation

2014 ◽  
Vol 63 (19) ◽  
pp. 198401
Author(s):  
Zhong Shu ◽  
Sha Jin ◽  
Xu Jian-Ping ◽  
Xu Li-Jun ◽  
Zhou Guo-Hua
Keyword(s):  
Low Frequency ◽  
Buck Converter ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Conduction Mode ◽  
Continuous Conduction Mode

scholarly journals Control Method for PEMFC Using Improved Deep Deterministic Policy Gradient Algorithm

2021 ◽  
Vol 9 ◽  
Author(s):  
Jiawen Li ◽  
Yaping Li ◽  
Tao Yu
Keyword(s):  
Optimal Control ◽  
Output Voltage ◽  
Control Method ◽  
Voltage Control ◽  
Control Policy ◽  
Gradient Algorithm ◽  
Data Driven ◽  
Q Learning ◽  
Policy Gradient

A data-driven PEMFC output voltage control method is proposed. Moreover, an Improved deep deterministic policy gradient algorithm is proposed for this method. The algorithm introduces three techniques: Clipped multiple Q-learning, policy delay update, and policy smoothing to improve the robustness of the control policy. In this algorithm, the hydrogen controller is treated as an agent, which is pre-trained to fully interact with the environment and obtain the optimal control policy. The effectiveness of the proposed algorithm is demonstrated experimentally.

Switching Power Supply Control Strategy Based on Monitoring Configuration

2021 ◽  
Vol 16 (5) ◽  
pp. 766-772
Author(s):  
Le Luo ◽  
Ming-Zhong Yang
Keyword(s):  
Predictive Control ◽  
Output Voltage ◽  
Distribution Systems ◽  
Control Method ◽  
Sliding Mode ◽  
Input Voltage ◽  
Buck Converter ◽  
Switching Power Supply ◽  
Switching Power ◽  
Overshoot And Undershoot

In this paper, a new discrete-time sliding mode predictive control (DSMPC) strategy with a PID sliding function is proposed for synchronous DC-DC Buck converter. The model predictive control, along with digital sliding mode control (DSMC) is able to further reducing the chattering phenomenon, steady-state error, overshoot, and undershoot of the converter output voltage. The proposed control method implementation only requires output error voltage evaluation. The effectiveness of the proposed DSMPC is proved through simulation results executed by the MATLAB/SIMULINK software. These results demonstrate its performance is superior to DSMC. The selected synchronous Buck converter in this paper has 380 V input voltage and 48 V output voltage that can be applied in sections of DC distribution systems.

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