A Robust Output Current Control Method with Disturbance Observer for Matrix Converter under Unbalanced Input Voltage

2007 ◽  
Author(s):  
Kazuo Oka ◽  
Kouki Matsuse
Keyword(s):  
Disturbance Observer ◽  
Control Method ◽  
Input Voltage ◽  
Matrix Converter ◽  
Current Control ◽  
Output Current

scholarly journals Decentralized Control Method of ISOP Converter for Input Voltage Sharing and Output Current Sharing in Current Control Loop

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1114
Author(s):  
Sung-Hun Kim ◽  
Bum-Jun Kim ◽  
Jung-Min Park ◽  
Chung-Yuen Won
Keyword(s):  
Decentralized Control ◽  
Control Method ◽  
Input Voltage ◽  
Current Control ◽  
Control Loop ◽  
Output Current ◽  
Signal Model ◽  
Control Loops ◽  
Current Sharing ◽  
Small Signal Model

Input-Series-Output-Parallel (ISOP) converters, a kind of modular converter, are used in high-input voltage and high-output current applications. In ISOP converters, Input Voltage Sharing (IVS) and Output Current Sharing (OCS) should be implemented for stable operation. In order to solve this problem, this paper proposes a decentralized control method. In the proposed control, output current reference is changed according to the decentralized control characteristic in individual current control loops. In this way, the proposed control method is able to implement IVS and OCS without communication. Also, this method can be easily used in current control loops and has high reliability compared to conventional control methods that require communication. In this paper, the operation principle is described to elucidate the proposed control and a small signal model of an ISOP converter is also implemented. Based on the small signal model, IVS stability analysis is performed using pole-zero maps with varying coefficients and control gains. In addition, the current control loop is designed in a stable region. In order to demonstrate the proposed control method, a prototype ISOP converter is configured using full-bridge converters. The performance of IVS and OCS in an ISOP converter is verified by experimental result.

A New Duty Cycle Control Strategy for Digital Constant-Current LED Drive Based on Buck-Boost Topology

2013 ◽  
Vol 392 ◽  
pp. 676-681
Author(s):  
Lin Bo Wang ◽  
Hong Kun He ◽  
Lei Shi ◽  
Jin Jin Yang ◽  
Qian Ni Feng
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
High Speed ◽  
Control Method ◽  
Visible Light Communication ◽  
Input Voltage ◽  
Current Control ◽  
Constant Current ◽  
Output Current ◽  
Embedded Chip

This paper proposes a new digital constant-current control method for high-power LED drive based on buck-boost topology. In this control system, buck-boost topology is used as the power conversion. The output voltage can be either higher or lower than the input voltage in buck-boost topology. Therefore, it solves the problem that in the buck topology the input voltage is required to be always higher than the output voltage. Furthermore, according to the input and output parameters, the duty cycle data which are used to maintain output current constant can be calculated in advance, and stored in the embedded chip. Thus, it can reduce the calculation of the embedded chip and solves the problem that the existing digital constant-current controllers need the high-speed analog-to-digital converter. In addition, in order to reduce the error generated in above calculation, the double threshold feedback circuit is used to fine-tune the duty cycle and makes the output current more steady and accurate. Meanwhile, due to adopting full-digital control, the brightness and flicker frequency of load LED can be conveniently regulated by modifying the system firmware. Therefore, this method can apply to the device of illumination, lighting decoration, visible light communication and so on.

A Deadbeat Predictive Current Control Method of PMSM Based on Double Disturbance Observer

2021 ◽  
pp. 2541-2548
Author(s):  
Xiaoning Mu ◽  
Fanquan Zeng ◽  
Yebing Cui ◽  
Shuwei Song ◽  
Yao Yao
Keyword(s):  
Disturbance Observer ◽  
Control Method ◽  
Current Control

Single-Stage LED Driver with Dimming and Universal Input Voltage Capability

2020 ◽  
Author(s):  
Giancarlo Clerici Daros ◽  
João Pedro Scherer Cipriani ◽  
Maikel Fernando Menke ◽  
Álysson Raniere Seidel
Keyword(s):  
Power Factor ◽  
Duty Cycle ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Current Control ◽  
Single Stage ◽  
Output Current ◽  
Constant Frequency ◽  
Good Efficiency ◽  
Variable Inductor

This paper presents a boost bridgeless totem-pole converter operating as power factor correction (PFC) stage integrated with a half-bridge LLC resonant converter as power control (PC) stage. The resultant single-stage converter yields in an effective integration, reducing the number of switches from 4 to 2 (50% reduction). This integrated topology aims decreasing conduction and commutation power losses and, moreover, achieving high power factor (PF), low total harmonic distortion (THD) and good efficiency. The converter is designed to have a fixed bus voltage, which is controlled by changing the half-bridge duty cycle under universal input voltage (UIV). However, since the HB duty cycle also affects the LLC converter due to their integration, a variable inductor is employed to control the LLC impedance and achieve a controlled output current and dimming capability, consequently a constant frequency operation is achieved. Simulation results are presented to verify the theorical analysis, through a 100 W LED luminaire. The results show voltage and current levels in the topology, as well as PF and THD levels in compliance with IEC 61000-3-2. Moreover, it is shown the feasibility of output current control capability through variable inductor even with HB duty cycle variation.

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