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This work comprises an extended and comprehensive evaluation of idealized class-E operation with finite DC-feed inductance. It exhibits an analysis of varying switching duty cycle as well as varying switch voltage slope at switch-on time. As a result of this special cases for idealized class-E operation able to maintain efficient zero-volt switching while the load resistance changes is revealed which...
A two-stage quasi-resonant LED driver with digital control method is proposed in this paper. The first stage of this converter is a boost circuit with power factor correction (PFC) function and the second stage is a dual Buck circuit which works in quasi-resonant zero voltage switching (ZVS) state. Because of the soft switching characteristics of the converter, switching losses are reduced and efficiency...
In this paper, a Buck-Boost operation in a bidirectional ZVS DC-DC converter is proposed. Initially, the static analysis of the proposed operation is presented, providing fundamental knowledge for a project methodology. Finally, in order to prove the theoretical analyses, simulation results are presented and discussed.
This paper presents new design procedure for a general class-E power amplifier, here referred to as quasi-class-E, with finite dc-feed inductance and switch on-resistance and variable duty cycle under variable voltage switching (VVS), and variable derivative voltage switching (VDS), taking into account the switch breakdown voltage. It is shown that for non-zero switch on-resistance in class-E power...
In transport application, long high power PEM fuel cell stacks could suffer from voltage discrepancy between cells due to severe constraints or appearance of localized faults in case of bad water management, moreover the output power of the stack is limited by the weakest group of cells. This article proposes a three-part segmented fuel cell associated with an isolated four-source DC/DC converter...
This paper presents a new design strategy for Symmetric Voltage Cancellation (SVC) Control used in LCL converters for Inductive Power Transfer (IPT) Systems. It was found that the operating mode that eliminated diode reverse recovery losses in the H-bridge had particularly low losses. An analytical technique is used to calculate the operating modes. Three common control schemes used in LCL converters...
A novel isolated bi-directional dc- dc converter is proposed in this paper which implements zero current switching (ZCS) for current-fed inverter of the low voltage (LV) side of the converter and zero voltage switching(ZVS) for voltage-fed inverter of the high voltage (HV) side of the converter. Applying the ZCS technique, circulating current of the transformer is limited by the current of input current-sources,...
In this paper, the operating principle of a soft-switching three-phase PWM inverter circuit and its experimental result verification are discussed and analyzed firstly. Then a comparative method is employed to obtain the detailed mathematical description of power loss and efficiency for the discussed soft-switching inverter circuit, and presents the power loss simplified models of inverter circuit...
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