Design of Peak Current Mode Synchronous Buck DC-DC Converter

In this article, a design scheme of peak current mode synchronous buck DC-DC converter is proposed based on synchronous rectification technology. The specific design scheme of the DC-DC converter is described from the overall structure design of control circuit, key circuit design and slope compensation. At the same time, the whole circuit simulation analysis of the DC-DC converter shows that the DC-DC converter has high performance

Energy-efficient and Power-dense DC-DC Converters in Data Center and Electric Vehicle Applications Using Wide Bandgap Devices

The ever increasing demands in the energy conversion market propel power converters towards high efficiency and high power density. With fast development of data processing capability in the data center, the server will include more processors, memories, chipsets and hard drives than ever, which requires more efficient and compact power converters. Meanwhile, the energy-efficient and power-dense converters for the electric vehicle also result in longer driving range as well as more passengers and cargo capacities. DC-DC converters are indispensable power stages for both applications. In order to address the efficiency and density requirements of the DC-DC converters in these applications, several related research topics are discussed in this dissertation. For the DC-DC converter in the data center application, a LLC resonant converter based on the newly emerged GaN devices is developed to improve the efficiency over the traditional Si-based converter. The relationship between the critical device parameters and converter loss is established. A new perspective of extra winding loss due to the asymmetrical primary and secondary side current in LLC resonant converter is proposed. The extra winding loss is related to the critical device parameters as well. The GaN device benefits on device loss and transformer winding loss is analyzed. An improved LLC resonant converter design method considering the device loss and transformer winding loss is proposed. For the DC-DC converter in the electric vehicle application, an integrated DC-DC converter that combines the on-board charger DC-DC converter and drivetrain DC-DC converter is developed. The integrated DC-DC converter is considered to operate in different modes. The existing dual active bridge (DAB) DC-DC converter originally designed for the charger is proposed to operate in the drivetrain mode to improve the efficiency at the light load and high voltage step-up ratio conditions of the traditional drivetrain DC-DC converter. Design method and loss model are proposed for the integrated converter in the drivetrain mode. A scaled-down integrated DC-DC converter prototype is developed to verify the design and loss model

Maximum Power Point Tracking Using a DC-DC Converter Coupled to Photovoltaic Cells and a Battery

Solar arrays provide power to loads and should ideally be operated at their maximum power point (MPP) to optimize the power output from the solar arrays under various environmental and operating conditions. Maximum power point tracking (MPPT) techniques control operating conditions so that the solar arrays are at or near the MPP. However, MPPT configurations use a DC-DC converter that contributes to power loss. The DC-DC converter in the disclosed configuration is relocated to a position in front of a battery, so that the power loss contributed by the DC-DC converter is reduced. A switch is also coupled across the DC-DC converter and can be switched closed so as to eliminate the power loss contribution of the DC‑DC converter. The switch is closed in situations when the battery rather than the solar array is providing power to the load

Improvement of speed response in four-phase DC–DC converter switching using two shunt voltage-source

This study proposes a technique that is able to improve the speed response of a four-phase DC–DC converter switching. The basic concept of the proposed technique is the inclusion of two shunt-connected voltage sources in series to the converter system. Using a higher input voltage to drive the load, a higher current per microsecond output system will be obtained and reverts to its nominal input upon obtaining desired references. Thus, the transient response observed when using this proposed technique is found to be much faster when compared to the conventional converter. Moreover, this technique is easily implemented as it requires only an additional voltage source, power switch, and power diode. The integrated model of the two shunt voltage-source in a four-phase DC–DC converter was simulated in MATLAB/Simulink and validated against the experimental results of a laboratory prototype, 600 W four-phase DC–DC converter. The novelty of this proposed technique is its ability to provide faster operations for critical loads applications, lower output capacitor and lower operating frequency

DC-DC Converter for Electric Vehicle

In this work, a DC-DC converter is designed for an electric vehicle. The DC-DC converter is designed to provide 500W with a 200-400V input and a 12-15V adjustable output. Electric vehicle sales are beginning to increase in popularity and the need for DC-DC converters to siphon power from the tractive system is not yet fully satisfied, especially for single-seater class vehicles. Additionally, improving performance in efficiency without sacrificing wide input voltage range can benefit future DC-DC converter designs. In the end, a forward active clamp DC-DC converter is designed and tested. Additionally, spreadsheet calculators, LTSpice simulations, and Matlab scripts were made to assist in work for the DC-DC

DC/DC converter

Tato práce se zabývá tranzistorovými měniči především čtyřkvadrantovým můstkem. Převážná část práce pojednává o budičích tranzistorů a možném způsobu řízení měniče. Součástí práce je i návrh řídící elektroniky a regulační struktury. V rámci této práce bude zároveň zkonstruováno zařízení, která bude dále sloužit jako učební pomůcka pro studenty.This project deals with transistorized converters in particular a four-quadrant bridge. The main part of project discusses the drivers of transistors and a possible way of controlling a converter. The proposal of control electronics and the regulation structure are involved in the second part. This project also includes a construction of an apparatus which will be used as a teaching material.

Power Stage Driving Schemes for Multilevel Converter

The disclosure is directed to an improved multilevel DC-DC converter, which is commonly used by electronic devices with subsystems that have different voltage needs. The improved DC-DC converter is more efficient and smaller than conventional converters

Design and Implementation of Boost Voltage Doubler for Maximum Power Point Tracker Application Using STM32F1038CT

Photovoltaic is an absolute device in the solar power plant system. A DC-DC converter with a maximum power point tracker (MPPT) algorithm is required to obtain the maximum power of photovoltaic. In general, solar power plant applications used a two-stage converter: the first stage is boosting DC-DC converter, and the second stage is the multilevel Inverter. Boost DC-DC converter is usually implemented singly, which causes many boost DC-DC converters to be implemented in a solar power plant application. The voltage doubler type boost DC-DC converter proposed in this paper is to simplify the circuit so that there is only one converter in a solar power plant application. This converter principle combines two conventional boost converters, which are integrated into one so that the power circuit and control circuit form become simpler. This proposal is verified through computation simulation and hardware design using the STM32F1038CT microcontroller for the final verification. The efficiency algorithm of the simulation is  99.7%, and the hardware experimental is 85.65%Photovoltaic is an absolute device in the solar power plant system. A DC-DC converter with a maximum power point tracker (MPPT) algorithm is required to obtain the maximum power of photovoltaic. In general, solar power plant applications used a two-stage converter: the first stage is boosting DC-DC converter, and the second stage is the multilevel Inverter. Boost DC-DC converter is usually implemented singly, which causes many boost DC-DC converters to be implemented in a solar power plant application. The voltage doubler type boost DC-DC converter proposed in this paper is to simplify the circuit so that there is only one converter in a solar power plant application. This converter principle combines two conventional boost converters, which are integrated into one so that the power circuit and control circuit form become simpler. This proposal is verified through computation simulation and hardware design using the STM32F1038CT microcontroller for the final verification. The efficiency algorithm of the simulation is  99.7%, and the hardware experimental is 85.65

DC-DC CONVERTER

The paper briefly refers to the feasibilities of the switched condenser (S. C.) concept in power electronics. Its main objective is the description of a thyristor chopper as it is one of the application of the S. C. concept. Its main attractions stem from the fact that no forced commutation is needed, it operates with high frequency at and near full load and its thyristor current is partly sinusoidal