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Coupled-inductor boost converters are under development for high-current, high-power applications ranging from automotive fuel cells to photovoltaics. In order to operate over the full load range of a dc-dc converter, the implemented controller must be capable of maintaining stability in both Continuous-Conduction Mode (CCM), and Discontinuous-Conduction Mode (DCM). This paper presents the development...
The audio-susceptibility of the average current-mode controlled buck dc-dc converter in continuous-conduction mode is presented in this paper. The average current-mode control scheme used in this paper regulates the true average component of the sensed inductor current and is not affected by a high inductor current ripple at low duty ratios. The principle of negative feedback for converters with the...
This paper proposes an optimised design approach for Multi-Modular (M-M), single-phase UPS inverters system. The Voltage Source Inverters (VSIs) have low output impedance for good voltage regulation, which conflict with the requirement of high impedance in the parallel configuration to restrain Inter-Modular (I-M) circulating currents. Conventional dual-loop approach of Proportional-Resonant (PR)...
A new non-linear voltage gain buck converter belonging to fifth-order family is proposed in this paper. As this converter has non-linear gain characteristic, it gives more bucking than the traditional buck converter. A time-domain analysis is formulated to predict the converter steady-state performance. Also, the equations for designing the energy storage elements are established. Salient performance...
In this paper, the mathematical modeling of Cuk converter operating in continuous conduction mode (CCM), is done by using the signal flow graph (SFG) method and Meyson gain formula. By using the obtained model, the output voltage to input voltage transfer function and also the output control transfer function are extracted. Moreover, the effects of equivalent series resistors (ESRs) on stability and...
This paper analyzes the effects of time constant mismatch on the dynamic behavior of current-controlled DC-DC converters that employ the lossless DCR inductor current sensing technique. Modeling of such mismatch is often oversimplified in the literature and treated as a simple modification of the small-signal modulator gain. The analysis proposed in this paper, on the contrary, demonstrates that time...
This paper introduces a novel digital peak current mode controller for dc-dc converters. In the proposed controller, the inductor current is reconstructed using the average value of inductor current, the input voltage, and the output voltage. All measured values for the controller are sampled at low sampling rate (equal to switching frequency), allowing use of low speed and low cost analog to digital...
It is well known that single-phase ac/dc converter requires big output capacitor to filter the input ripple power from the grid. To interface a dc nanogrid to a single-phase utility, bidirectional power flow and small dc side output voltage ripple are also necessary. By cascading a full-bridge ac/dc converter with a bidirectional buck converter, a two-stage ac/dc topology is adopted to reduce the...
This paper introduces a new modular master-less active control method for current share in digitally controlled DC-DC converters that communicate over single wire bus. Current balance among paralleled converters is achieved with new current error zeroing method. Experimental results show the new scheme exhibiting excellent static and stable dynamic current matching performance. The paper also includes...
Small signal analysis of active clamped zero-voltage switching (ZVS) current-fed isolated dc/dc converter has been presented is presented in this paper. State space averaging is used to derive the small signal model. A closed loop controller is designed to regulate the converter output over wide range of power (1:10) and source voltage (1:2) with fixed frequency duty cycle modulation. Bode plots are...
Fuel cell systems are often low voltage systems requiring their output voltage to be increased to a few hundred volts in order to be suitable for vehicles power-trains, grid connected inverters or many other practical applications. Therefore, boost converter power electronic circuits are required. In this paper, it is designed initially a single and then a dual loop control for a four-phase floating...
This paper proposes a charging control strategy for lithium-ion batteries. The method applies the post-charged steady-state battery voltage to justify the characteristics of durability for the lithium-ion battery, while the possibility of over-charging and under-charging conditions can be better avoided. In the method, the charging capacity, the charging security, and battery durability are all taken...
New technologies are requiring high step-down conversion voltages. A possible solution to this problem is to use several buck converters connected in cascade; however, a complex control circuitry is required. An alternative solution is to use an n-stage positive output cascade buck converter with a single active switch. This class of converters is suitable for VRM applications where low voltages and...
This paper presents an average current mode controller with a feedback clamp circuit for converter based optimal battery chargers. Similar to conventional controllers, the proposed implementation enables the converter to work as a current source when the battery state-of-charge (SOC) is below a predefined reference level and automatically reverts to voltage source when the battery SOC exceeds the...
A fully integrated wide-band PID controller is implemented for a buck DC-DC converter operating in voltage mode. To implement efficiently areal on-chip PID controller, a novel compensator is proposed utilizing AC ripple current of the inductor. The integral controller with an error amplifier and the proportional controller do not require any additional capacitors. The bandwidth of overall loop is...
In this paper a digital voltage-mode controller design methodology is proposed for the fourth order split inductor converter load voltage regulation. The salient features of the split-inductor converter are compared with the conventional SEPIC converter and then discrete-time mathematical models are established. Digital single-loop voltage-mode controller is designed using direct digital design approach...
This paper proposes a circuit topology for a matrix converter with a boost up function in the input side. The proposed circuit uses a V-connection AC chopper to achieve the boost-up function. The matrix converter and the V-connection AC chopper are independently controlled, where a virtual indirect control method is applied to the matrix converter, and the control of the V-connection AC chopper is...
This paper presents the analysis and control design of a CUK topology based high power factor AC/DC converter. To achieve the fast response of output voltage control, the load current is fed to the controller to generate the converter current command. From the current transducer cost, the load current is estimated by a closed loop estimator. The output voltage and output inductor voltage are sensed...
Power factor correction converters are nonlinear power electronics circuits used as AC-DC power supplies and due to their nonlinearity they exhibit nonlinear phenomena such as sub-harmonic oscillations and chaotic regimes. These undesirable behaviors increase the total harmonic distortion and therefore can jeopardize enormously the system performances. In this paper, a notch filter based controller...
This paper characterizes two digital V2 control schemes using for the buck converters with small-ESR capacitors based on the presented small-signal models. Due to the sampling effects of the analog-to-digital converters (ADCs), the digital V2 control system performances are not as good as the analog ones, even using the inductor current sensing feedback. The major issue is that in order to stabilize...
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