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This paper presents the analysis and design of the full-bridge (FB) LC parallel resonant plasma driver at the radio-frequency (RF) operation with variable-inductor based phase control scheme. Since the switching frequency of the RF plasma module is mainly fixed at 13.56MHz for EMC regulation, the variable-inductor control scheme can adjust the transconductance amplitude to enable load-current regulation...
A bidirectional ZVT buck and boost converter with coupled inductors is proposed in this paper. In this converter a coupled inductor is used to reset the auxiliary circuit current to zero, in order to ensure soft switching of the auxiliary switches at turn off. All switches in the proposed converter are soft switched and thus high efficiency is achieved. The principle of operation is explained and...
This paper presents a new single stage dc-dc boost converter topology with very large gain conversion ratio as a switched inductor multilevel boost converter (SIMLBC). It is a PWM-based dc-dc converter which combines the Switched-Inductor Structures and the switching capacitor function to provide a very large output voltage with different output dc levels which makes it suitable for multilevel inverter...
A current-fed DC-DC converter with zero-current switching (ZCS) is presented in this paper. The front stage, which is a DC-DC buck converter, is used to regulate the output voltage by utilizing pulse-width modulation. The rear stage, which is a push-pull DC-DC converter by using the current-fed technique, is used to transfer energy from low voltage side to high voltage side for high voltage applications...
A novel single-stage three phase high power factor converter based on three-level zero-voltage and zero-current soft-switching circuit is proposed, which can mitigate a contradiction between voltage rating of power switches and high-power factor in the conventional three-phase single-switch DCM boost power-factor correction circuit and provides softs-witch for all power switches. The three-level structure...
In this paper, a soft-switching interleaved circuit applied in three-level inverters is proposed. An interleaved three-level inverter is realized by employing two interleaved power switches in parallel at the most upper and the lowest location in traditional three-level inverters. By further inserting a small current-limiting inductor in each interleaved switch branch, each interleaved power switch...
When a low voltage DC power source is used, a DC-DC converter with a high step-up voltage gain is required to raise the voltage to more applicable levels. This is typically achieved in classical converters which often have to be driven by pulse width modulation (PWM) waves with extremely high duty cycles. Although theoretically step-up converters can achieve an infinite gain as the duty cycle approaches...
This paper presents the system modeling and analysis of the single-phase current regulation module (CRM) in continuous-conduction-mode (CCM) at steady state for use in the electrical discharge machines (EDMs). Based on the equivalent model of the three-terminal PWM switching cell, the small-signal equivalent circuit models of the single-phase CRM are obtained to derive the corresponding open-loop...
Ensuring stable operation is perhaps one of the most challenging aspects of designing a power-supply circuit because the load is dynamically unpredictable and widely variable. Unfortunately, the nonlinear dynamics of switch-mode converters accentuate these difficulties, especially when considering conventional analytical techniques rely on abstract mathematics to describe ac switching events that...
In this paper, a universal auxiliary circuit named Zero Current and Zero Voltage Transition (ZCZVT) commutation cell applied to buck converter is presented. The operation of the proposed ZCZVT commutation cell applied to buck converter is theoretically analyzed. With the use of the proposed commutation cell, which is activated only during the switching transitions, full load range soft switching for...
This paper presents a practical design method for the critical-conduction mode power factor correction (CRM PFC) converter by using an interactive mathematical computation and documentation software, the MathCAD. Many design factors affect the performance of a switching converter from the point view of efficiency optimization or dynamic response. The design of a CRM PFC converter is an involved process...
The systematic design of canonical elements for power processing is carried out by inducing sliding motions in appropriate DC-DC switching converters whose equilibrium state is characterized by the corresponding descriptive equation of the canonical element. A search of candidates to implement DC transformers, power gyrators and loss-free resistors is performed by studying a great number of converters...
Flyback switched-mode converters are among the most popular in the low-power range, due to their simplicity and low cost. They are especially popular in multi-output applications, due to the low parts count-one diode and capacitor per output. They would be even more popular if the output regulation were better. This paper reviews the common techniques to tighten the output regulation, and summarizes...
A novel ZVZCS L2C-Type parallel resonant converter is presented in this paper. This converter, compared with the Type-4 LLC converter, narrows the switching frequency deviation under wide input voltage range applications, while maintaining all soft-switching advantages as ZVS for primary switches and ZCS for output rectifiers, both of which eases design for input EMI filter. In addition, the proposed...
This paper proposes a three-phase, two-switch, buck converter that can operate with input power factor correction. The key features of the proposed converter are that a switch in it can operate with almost half the voltage stress of that in the standard three-phase, single-switch buck converter and with less current stress. In the paper, the operation of the converter is discussed and a detailed mathematical...
Average model of three-phase PWM converters is important in both theory and practical engineering. To remedy defects possessed by the existing average models of three-phase boost rectifiers and voltage source inverters (VSI), this paper proposes and derives another new-formed models that are easy-to-use and more suitable for computer simulation. During establishing switching models, the number of...
In this paper the nonlinear average current control for a DC-DC buck converter is presented in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The outer voltage control loop uses a PI controller. In the present control scheme, switch current is being sensed instead of inductor current. Sensing of the switch current instead of inductor current is particularly attractive...
This paper presents an analysis of characteristics of multiphase buck converters with coupled inductors. We derive equivalent inductances that provide both low per-phase steady-state ripple current and fast transient response. The characteristics of coupled-inductor circuits - low per-phase ripple current and fast response - were examined and verified by circuit simulation and experiments.
This paper presents a closed loop control design for a two inductor active-clamped ZVS current-fed isolated DC-DC converter using two-loop average current control. State-space averaging technique is used to derive the small signal model. The controller is designed for fixed frequency duty cycle modulation and works for wide input voltage and load variation. A complete design procedure is presented...
DC-DC switch-mode converters recently have been increasingly used in many EV and HEV applications when the power distribution is in the form of multi-converter DC electrical system due to their good specifications. Different control strategies such as sliding mode control and current mode control have been applied to DC-DC converters to improve their robustness, efficiency, and stability. However,...
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