6,021 research outputs found
Using constant switching frequency control in linear-assisted DC-DC switching converters for photovoltaic solar regulators
This article shows the proposal of a linear–assisted converter or linear–&–switching hybrid converter with a constant switching frequency for photovoltaic solar DC-DC regulators. The control loop of the system is based on the current–mode technique. The main disadvantage of a converter with current–mode control is the inherent instability of the loop when switch duty ratios are greater than 0.5. In order to make stable the proposed linear–assisted converter, the article shows the technique based on a slope compensation.Postprint (published version
Efficient LDO-Assisted DC/DC buck converter for integrated power management system
DC-DC Switching Converters; Voltage Linear Regulators; Linear-Assisted DC-DC Voltage Regulators.Postprint (published version
Capacitorless DC–DC regulator as a candidate topology for photovoltaic solar facilities
Postprint (published version
Linear-assisted DC/DC converters with modified current-mode control applied to photovoltaic solar systems
This article shows the proposal of a current-mode one-cycle control for linear-assisted DC/DC converters. Linearassisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: voltage linear regulators (classic NPN topology or LDO –low dropout–) and switching DC/DC converters. The current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch. The proposed structure can provide an output with suitable load and line regulations. Thus, the paper shows the design and simulation results of the proposed current-mode one-cycle linear-assisted converter.Postprint (published version
Comparative aspects in control strategies for hybrid DC-DC converters
Linear-switching hybrid DC/DC converters consist of a voltage linear regulator (classic NPN or nMOS topologies and LDO) connected in parallel with a switching DC/DC converter. In order to control these hybrid structures, different strategies exist, allowing to fix the switching frequency as a function of some parameters of the linear regulator. This article compares two control strategies that, although can be applied to the same circuital structure of linear-assisted converter, are sensibly different. The first one, reported in previous literature, cancels completely the average current through the linear regulator in steady state to achieve a reduction of the losses. Thus the efficiency of the whole system increases and almost equals the one of the standalone switching converter. The proposed approach, in spite of a slightly increment of linear regulator’s losses, reduces the output ripple due to the crossover distortion of linear regulator output stage.Postprint (published version
On capacitor–less linear–assisted DC–DC regulators as candidate topology for photovoltaic solar facilities
Linear-assisted DC/DC converters (or linear-switching hybrid DC/DC converters) consist of a voltage linear regulator (classic NPN or nMOS topologies and LDO) connected in parallel with a switching DC/DC converter. They are good candidates for energy processing in photovoltaic solar facilities. In order to control these hybrid structures, different strategies exist, allowing fixing the switching frequency as a function of some parameters of the linear regulator. This article compares two control strategies that, although can be applied to the same circuital structure of linear-assisted converter, are sensibly different. The first one, reported in previous literature, cancels completely the average current through the linear regulator in steady state to achieve a reduction of the losses. Thus the efficiency of the whole system increases and almost equals the one of the standalone switching converter. The proposed approach, in spite of a slightly increment of linear regulator’s losses, reduces the output ripple due to the crossover distortion of linear regulator output stage.Postprint (published version
Linear–Assisted DC/DC Converters with Modified Current-Mode Control Applied to Photovoltaic Solar Systems
Los convertidores DC/DC asistidos linealmente (linear-assisted DC/DC converters) son estructuras que permiten aprovechar las ventajas de las dos alternativas clásicas en el diseño de sistemas de alimentaciĂłn: reguladores de tensiĂłn lineales (ya sean Ă©stos con topologĂa clásica NPN o del tipo LDO
–baja tensiĂłn de dropout–), y convertidores DC/DC conmutados. En este trabajo se muestra la propuesta de un control de un ciclo en modo corriente modificado (modified current-mode one-cycle control technique) para convertidores DC/DC conmutados asistidos linealmente. Se propone esta tĂ©cnica de control de un ciclo en modo corriente modificado con el fin de obtener el ciclo de trabajo del interruptor del convertidor conmutado. La estructura propuesta puede proporcionar una salida con adecuadas regulaciones de carga y de lĂnea. El trabajo muestra el diseño de las propuestas del regulador DC/DC asistido linealmente, asĂ como los resultados de simulaciĂłn que validan la propuesta presentada en el artĂculo.Peer Reviewe
Current-Mode One-Cycle Control Applied to Linear-Assisted DC/DC Converters
This article shows the proposal of an current-mode one-cycle control for linear-assisted DC/DC converters. Linearassisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: voltage linear regulators (classic NPN topology or LDO –low dropout–) and switching DC/DC converters. The current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch.
The proposed structure can provide an output with suitable load and line regulations. The paper shows the design and simulation results of the proposed current-mode one-cycle linear-assisted converter.Postprint (published version
Current-mode one-cycle control applied to linear–assisted DC/DC converters
This article shows the proposal of an current-mode one-cycle control for linear-assisted DC/DC converters. Linear-assisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: voltage linear regulators (classic NPN topology or LDO –low dropout–) and switching DC/DC converters. The current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch. The proposed structure can provide an output with
suitable load and line regulations. The paper shows the design and simulation results of the proposed current-mode one-cycle linearassisted converter.Postprint (published version
Current–Mode One-Cycle control applied to linear–assisted DC/DC converters
This article shows the proposal of an current-mode one-cycle control for linear-assisted DC/DC converters. Linear-assisted DC/DC converters are structures that allow to take advantages of the two classic alternatives in the design of power supply systems: voltage linear regulators (classic NPN topology or LDO –low dropout–) and switching DC/DC converters. The current-mode one-cycle control technique is proposed in order to obtain the duty cycle of the linear-assisted converter switch. The proposed structure can provide an output with
suitable load and line regulations. The paper shows the design and simulation results of the proposed current-mode one-cycle linearassisted converter.Postprint (published version
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