Thermoelectric-Generator-Based DC- DC Conversion Network
... First of all, I would like to thank Professor Li-Rong Zheng for introducing me to this intriguing research field. Thank you for the enlightening insights you provided during our first discussion about this thesis. Also inspiring is the guidance from Dr. Qiang Chen, my supervisor in this thesis proje ...
... First of all, I would like to thank Professor Li-Rong Zheng for introducing me to this intriguing research field. Thank you for the enlightening insights you provided during our first discussion about this thesis. Also inspiring is the guidance from Dr. Qiang Chen, my supervisor in this thesis proje ...
High Power DC/DC Converter Topologies
... Zero voltage switching even at no load condition Reduced switching loss through ZVS Improved efficiency and EMI When the two magnetic components are implemented with a single core (use the leakage inductance as the resonant inductor), one component can be saved ...
... Zero voltage switching even at no load condition Reduced switching loss through ZVS Improved efficiency and EMI When the two magnetic components are implemented with a single core (use the leakage inductance as the resonant inductor), one component can be saved ...
PDF
... chargers. These isolated ac–dc converters are most commonly realized using two conversion stages, combining a non-isolated power factor correction (PFC) rectifier with an isolated dc–dc converter. This, however, involves two loss stages and a relatively high component count, limiting the achievable ...
... chargers. These isolated ac–dc converters are most commonly realized using two conversion stages, combining a non-isolated power factor correction (PFC) rectifier with an isolated dc–dc converter. This, however, involves two loss stages and a relatively high component count, limiting the achievable ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
... obtained from the voltage conversion that larger d1 means smaller d2 . When the input voltage is higher than the output voltage, Q2 can be always off, i.e., d2= 0, and the duty cycle of Q1 is controlled to regulate the output voltage. In this case, the TSBB converter is equivalent to a buck converte ...
... obtained from the voltage conversion that larger d1 means smaller d2 . When the input voltage is higher than the output voltage, Q2 can be always off, i.e., d2= 0, and the duty cycle of Q1 is controlled to regulate the output voltage. In this case, the TSBB converter is equivalent to a buck converte ...
- Wiley Online Library
... The simplest zero-order switching converter consists of one inductor and two switches. The reason for choosing the inductor (instead of the capacitor) is that the input is a voltage source and the output is a capacitor, both of which can only be switched abruptly onto an inductor (not capacitor). At ...
... The simplest zero-order switching converter consists of one inductor and two switches. The reason for choosing the inductor (instead of the capacitor) is that the input is a voltage source and the output is a capacitor, both of which can only be switched abruptly onto an inductor (not capacitor). At ...
Analysis of a Novel Soft Switching Bidirectional DC-DC
... Since the switch mode power conversion system is employed for every alternative energy generation system and the efficiency of the power conversion system is in close connection with that of entire system, the researches of inverter and converter have processed vigorously. Particularly, in order to ...
... Since the switch mode power conversion system is employed for every alternative energy generation system and the efficiency of the power conversion system is in close connection with that of entire system, the researches of inverter and converter have processed vigorously. Particularly, in order to ...
Application Note OptiMOS CoolMOS The Optimal Solutions Suitable
... Table 1 and Table 2 list the numbers of VRLA, which is very important because it plays a decisive role in the output voltage variety range of HVDC rectifier. The input voltage range of DC/DC converter is about 100 V for the two HVDC systems as showed in Table 1 and Table 2, and more challenging for ...
... Table 1 and Table 2 list the numbers of VRLA, which is very important because it plays a decisive role in the output voltage variety range of HVDC rectifier. The input voltage range of DC/DC converter is about 100 V for the two HVDC systems as showed in Table 1 and Table 2, and more challenging for ...
- Nottingham ePrints
... are seventy-two valid switching states to be evaluated in the cost function each sampling time, nine given by the rectifier side and eight by the inverter side. But as only a positive dc-link voltage is allowed at any time, the number of valid switching states in the rectifier side that can be appli ...
... are seventy-two valid switching states to be evaluated in the cost function each sampling time, nine given by the rectifier side and eight by the inverter side. But as only a positive dc-link voltage is allowed at any time, the number of valid switching states in the rectifier side that can be appli ...
HVDC converter
An HVDC converter converts electric power from high voltage alternating current (AC) to high-voltage direct current (HVDC), or vice versa. HVDC is used as an alternative to AC for transmitting electrical energy over long distances or between AC power systems of different frequencies. HVDC converters capable of converting up to two gigawatts (GW) and with voltage ratings of up to 900 kilovolts (kV) have been built, and even higher ratings are technically feasible. A complete converter station may contain several such converters in series and/or parallel.Almost all HVDC converters are inherently bi-directional; they can convert either from AC to DC (rectification) or from DC to AC (inversion). A complete HVDC system always includes at least one converter operating as a rectifier (converting AC to DC) and at least one operating as an inverter (converting DC to AC). Some HVDC systems take full advantage of this bi-directional property (for example, those designed for cross-border power trading, such as the Cross-Channel link between England and France). Others, for example those designed to export power from a remote power station such as the Itaipu scheme in Brazil, may be optimised for power flow in only one preferred direction. In such schemes, power flow in the non-preferred direction may have a reduced capacity or poorer efficiency.HVDC converters can take several different forms. Early HVDC systems, built until the 1930s, were effectively rotary converters and used electromechanical conversion with motor-generator sets connected in series on the DC side and in parallel on the AC side. However, all HVDC systems built since the 1940s have used electronic (static) converters.Electronic converters for HVDC are divided into two main categories. Line-commutated converters(HVDC classic) are made with electronic switches that can only be turned on. Voltage-sourced converters(HVDC light) are made with switching devices that can be turned both on and off. Line-commutated converters (LCC) used mercury-arc valves until the 1970s, or thyristors from the 1970s to the present day. Voltage-source converters (VSC), which first appeared in HVDC in 1997, use transistors, usually the Insulated-gate bipolar transistor (IGBT).As of 2012, both the line-commutated and voltage-source technologies are important, with line-commutated converters used mainly where very high capacity and efficiency are needed, and voltage-source converters used mainly for interconnecting weak AC systems, for connecting large-scale wind power to the grid or for HVDC interconnections that are likely to be expanded to become Multi-terminal HVDC systems in future. The market for voltage-source converter HVDC is growing fast, driven partly by the surge in investment in offshore wind power, with one particular type of converter, the Modular Multi-Level Converter (MMC) emerging as a front-runner.