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This paper proposes a control method to extend the range of ZVS in the phase-shifted full-bridge(PSFB) converter without any additional auxiliary components. During the dead-time, ZVS is achieved by using the energy stored in the inductors to discharge and charge the output capacitance of switches. By analyzing the equivalent circuit of the converter during dead-time, the relationship between the...
This paper introduces extension of concept of discrete control method of class E amplifier to the varying load reactance. Previous discrete control method could keep nominal operation of the class E amplifier for varying load resistance. But, it could not apply for the varying load reactance. In this paper, with varying shunt capacitance and output resonant capacitance, discrete control which keeps...
This paper presents the analysis of problem as to when the GaN HEMT (Gallium nitride high electron mobility transistor) is applied to power conversion system. Compared to state-of-the-art super junction Si (Silicon) MOSFET (Metal oxide semiconductor field effect transistor), the FOM (Figure of merit) is much better because of heterojunction structure and wide band gap characteristics. However, designing...
In this paper, the effect of phase shift modulation on the LLC resonant converter for an interleaved LLC resonant converter with phase shift modulation is investigated. The LLC resonant converters can achieve zero voltage switching (ZVS) of the primary switches and the zero current switching of secondary switches. Due to the sinusoidal shapes and discontinuous conduction of secondary current, the...
This paper proposes a PFM+PWM hybrid controlled soft-switching half-bridge converter which has both benefit of conventional half-bridge converter and LLC converter. Generally, conventional half-bridge converter has good constant current characteristic due to PWM control, however it has some drawbacks of (1) primary side switches and secondary side diodes operate under hard switching, (2) two magnetic...
The main theme of this paper is to propose a switching control method for LLC converter with larger magnetizing inductance to improve the light load efficiency. The proposed switching technique is to replace conventional frequency modulation method which is with constant duty while regulating the output voltage by varying the switching frequency, with pulse-width modulation while retaining the special...
This paper proposes a current-fed two inductor bi-directional DC-DC converter using resonance (CF-TIBCR). The power losses of CF-TIBCR mainly occur in switches, especially the low voltage side switches. To improve the efficiency, the detailed loss analysis of switch and magnetic components is performed from the steady state analysis and operation principles. To verify theoretical loss analysis, it...
This paper presents a soft-switching modular three-phase ac voltage regulator which can solve the abnormal voltage problems such as under-voltage, over-voltage, voltage sag and voltage swell. The proposed scheme is the combination of three single-phase modules while each one of the single-phase module is a serial compensation ac voltage regulator. Besides, each one of the single-phase module is composed...
This paper focuses on Voltage Fed Dual Active Bridge (VF-DAB) bidirectional DC-DC converter modules connected Input Parallel and Output Parallel (IPOP) configuration. Modularity or parallel operation of the bidirectional DC-DC converters for energy storage application is not just an economic solution for increasing the power transfer capability, but also provides several advantages such as redundancy,...
Capacitive power transfer uses an electric field to transmit power through physical isolation barrier utilizing capacitances formed by a couple of metal plates. Despite simplicity of the energy link structure, however, the physical dimension and low dielectric constant of the interface medium usually limits the effective link capacitance to be very small and nearly comparable to the main switch output...
A new hybrid zero voltage switching (ZVS) three-level and half-bridge DC/DC converter is presented to achieve the functions of low voltage stress of switches, low circulating current during the freewheeling interval, wide ZVS range of lagging-leg switches, low output inductor and energy transfer within the whole switching period. The proposed converter includes a three-level phase-shifted pulse-width...
According to the Emerge Alliance, the interest for 380Vdc power distribution for data centres is growing. The DC distribution reduces the number of power conversion steps by utilizing a DC voltage of 380V; it provides a significant reduction of cable dimensions and associated costs. Some server board vendors have recently begun to initialize a move from a supply voltage of 12Vdc to 48Vdc. In order...
In this paper, a new AC-DC single stage three-level resonant converter has been proposed for high voltage DC distribution system of datacenters applications. This converter convert universal input voltage range (90–265Vrms) to 380VDC with high power factor. The proposed topology integrates a bridgeless boost converter and a half-bridge three level resonant converter. Voltage stresses on the switches...
With the growth of telecommunication systems in remote areas, demand of wind solar hybrid systems is demanding in this industry. In this paper a 3 MHz DC-DC converter for standalone wind/solar application is proposed. The proposed converter is able to operate at a high frequency and to function in a wide range of input voltage. These specs make the system ideal for wind/solar energy systems. All MOSFETs...
This paper describes an isolated single stage converter AC/DC Power Factor Corrected (PFC) converter in two realizations. One is with a full bridge rectifier at its input and the other is a True Bridgeless version. The converter is derived from a topology known as the Davidson Converter that was invented and patented by the author in the early 80s'. This converter topology has very interesting properties...
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