The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A high-gain non-isolated DC-DC converter is proposed with a inversely coupled inductor and a voltage lift cell. Energy stored in the leakage inductance of the coupled inductor is recycled through a voltage lift cell to obtain high voltage conversion ratio. The operation of the proposed converter is explained using its equivalent circuits which are used to derive static gain expression. The operation...
The multilevel converter is a prospective topology for both Medium Voltage and High Voltage Direct Current (HVDC) applications. In high power application, the forward topology is applied to increase the power region. In this paper, a novel forward-mode five-level inverter is presented which combines the features of the conventional multilevel converters and forward topology. The converters can transfer...
Due to the increasing demands of safe and efficient renewable energy systems, isolated DC-DC converters became widely used in this field as the essential power conversion blocks. At the same time, such converters are demanded for wide input voltage range and fault tolerance as desirable features. This paper proposes a isolated boost full bridge DC-DC converter which features wide input range and resilient...
Techniques of long-term in-vivo electrophysiological recording play important roles in brain research and neural rehabilitation. To avoid interruption of experiment and risk of infection, use of wireless power transfer (WPT) technique has recently been suggested to eliminate cumbersome wires and batteries attached to the animals in rodent electrophysiological applications. This paper presents a holistic...
A current-fed soft-switching three-phase dc-dc converter suitable for high-power high-voltage-gain applications is presented in this paper. Proposed converter consists of constant-current-fed three-phase inverting bridge with reverse-blocking switches, primary-Y-connected three-phase transformer and voltage-doubler rectifier modules at the output. The rectifier modules are connected in series at the...
A low voltage ride-through solution for an indirect three-level matrix converter based open-end winding drive is demonstrated. The proposed method uses the input filter capacitors to exchange the inertial energy from the motor and thereby maintain the flux in the motor during grid fault conditions. The input filter capacitors act as the voltage source for inverters during the fault. Ride-through is...
Wide-band-gap devices can provide much faster switching speed. But the dv/dt of switching node voltage also becomes much higher, causing potential common mode noise issue. On the other hand, PCB winding transformer has significant large inter-winding capacitance, which provides a low impedance path for common mode noise. In this paper, a symmetrical resonant converter as well as a symmetrical PCB...
A new three-phase DC-DC PWM boost converter that is suitable for use in renewable energy applications is proposed in the paper. The number of components in the proposed circuit is fewer that other previously proposed converters of the same type, resulting in lower cost and simpler operation. The paper presents the new converter and discusses its operation, features and design. Experimental results...
A modular multilevel converter (MMC) configuration is presented as a medium-voltage high-power drive for variable-speed applications incorporating symmetrical six-phase machines. The topology employs six standard MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of ripple-power decoupling between adjacent sub-modules...
In single-phase photovoltaic (PV) systems, power mismatching between input and output terminal leads to power pulsation, seriously affecting maximum power point tracking (MPPT). Paralleling an electrolytic capacitor (e-cap) across PV panel to smooth power pulsation seems to be an unreliable method owing to its short lifetime. Various power decoupling methods used in micro-inverters have been proposed...
This study presents a new high step-up resonant converter for renewable energy applications. Since, renewable sources introduce relatively low voltage, it is necessary to step up the voltage in order to be used in regular applications. The proposed converter has employed a coupled inductor and a switched capacitor to step up the output voltage. An active clamp circuit has been adopted to guarantee...
Single-ended primary-inductor converter (SEPIC) is a dc-dc converter which uses a series capacitor to couple energy from the input to the output. The customized SEPIC converter by two configurations lacking magnetic coupling and by means of magnetic coupling is presented with two high-static gain here. The configuration through magnetic coupling have an output voltage of efficiency 91.9% with a increase...
In this paper, the low voltage and high current driver is used as an example to analyze and suppress the EMC problem caused by DC / DC power conversion. In the process of low-voltage and high-current driver design, the problem of misalignment of the drive signal occurs. The paper analyzes the mechanism of the electromagnetic interference in the switch process, and then detects the electromagnetic...
Flyback converters are widely used in telecom applications with two of the most popular being in point-of-use power supplies and as part of two-stage AC-DC converters. They can be implemented with either passive snubbers or active snubbers for the main converter switch. Active snubbers are generally thought to be more efficient but more expensive than passive snubbers, but recent developments in passive...
The proposed and argued concept for realization includes the possibility of realizing an average of the medium voltage transformer, for example, with 10 / 0.22 kV parameters. Equipment with these parameters is known as Solid State Transformer (SST), which provides direct connection of consumers to the medium voltage power supply. The output frequency of these transformers is equal to the industrial...
When a converter changes into the discontinuous mode, a ringing starts across the semiconductors. This is caused by the necessary voltage step across them and the necessity to charge the parasitic capacitors of the devices. To reduce this swinging, another strongly coupled winding is applied to the magnetic device of the converter. By shunting this winding, when the active switch and the passive switch...
Based on the analysis of the SRG power generation system, a zero-input current ripple QBC with coupled inductor was designed to solve the problem about the large ripple of output voltage and the influence of current ripple on the load in case of endangering the operation of sensitive load, which can realize zero-input current ripple and zero-output voltage ripple by allocating parameters(turn ratio,...
In this paper, a novel bridgeless Flyback power factor correction rectifier is presented. Two active power switches, rather than the line-voltage diode bridge, are used to provide the bidirectional power flow. In comparison with the existing Flyback rectifiers, the proposed topology uses less number of transformer windings which simplifies the complexity of implementation in terms of magnetic utilization...
This paper investigates the effect of a capacitive three-phase auxiliary winding on the target variables of a three-phase squirrel cage induction motor (SCIM). The three-phase auxiliary winding is only magnetically coupled to the stator main winding. The three-phase SCIM is modelled using 2D Finite Element Method (FEM). The flux density distribution is numerically computed through the magnetostactic...
Geomagnetic disturbances (GMD) drive geomagnetically induced currents (GICs) in power networks. GICs are considered DC in nature due to their very low frequency (less than 1 Hz). GICs are known to trigger half-cycle saturation in power transformers. This, in turn, leads to stray flux, unusual swings in active and reactive power, and harmonics. The GIC flow could eventually collapse the entire power...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.