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The technique of both the electric lightings and the electric vehicles have been more and more grown and the power consumption is very important part. This paper presents a phase shift full bridge(PSFB) converter with the zero-voltage-switching range expansion. In addition, the proposed converter provides both good efficiency and low switching device noise. The experimental and simulation results...
Short arc lamps are now widely utilized as illumination sources for a large number of investigations in wide-field fluorescence microscopy. Among many power converters for the lamp, the flyback converter is chosen by many converter designers due to high power density, structural simplicity, and miniaturization. Also, an electrolytic capacitor is generally chosen for the stabilization of the DC voltage...
Interest of light emitting diode (LED) lightings is more and more increased because of its low power consumption and long lifetime. Generally, the LED lighting is driven by a power converter. Electrolytic capacitors are used for stabilizing the output ripple of the power converter. However, the expected lifetime of electrolytic capacitors is very shorter than LED or other components in the power converter...
This paper presents a single-stage asymmetrical LLC resonant converter which performs both input-current harmonics reduction and power factor correction (PFC). The proposed asymmetrical control approach has rather the low voltage stress in the power switches than the conventional control approach for the single-stage LLC resonant converter. Furthermore, this converter achieved zero voltage switching...
Most of the Maximum Power Point Tracking(MPPT) controls for a wind generation system are based on the unknown wind speed. In these methods, a Power Signal Feedback(PSF) method, an optimal Tip Speed Ratio(TSR) method and a Perturbation & Observation(P&O) method are used. However, in this paper, an estimating technique of the wind speed using the efficiency curve of the blade is proposed. By...
A Light Emitting Diodes(LED) lighting is increasingly used because of its low power consumption and long lifetime. Of many power converters, a flyback converter is applied for the LED lightings and has some electrolytic capacitors for stabilizing the output voltage. But the expected life span of the electrolytic capacitors is much shorter than that of the LED elements. It makes the lifetime of the...
A dual-output LLC resonant converter for a high power LED lamp is proposed in this paper. One of dual output nodes is for the LED lighting and a closed-loop control strategy is applied. The other is used for charging a battery using one auxiliary switch and pulse width modulation IC. The proposed converter circuit is used a half-bridge-type LLC resonant converter and designed for obtaining soft-switching...
An electrical vehicle (EV) is a huge issue in the automotive industry. The EV has many electrical units: electric motors, batteries, converters, etc. The DC power distribution system (PDS) is essential for the EV. The DC PDS offers many advantages. However, multiple loads in the DC PDS may affect the severe instability on the DC bus voltage. Therefore, a voltage bus conditioner (VBC) may use the DC...
The VBC (Voltage Bus Conditioner) is a bidirectional DC-DC converter for damping the instability and any transients of bus voltage in the DC DPS (Distributed Power System). In this paper, the PI controller for the VBC has designed at the frequency domain. The proposed PI controller is not only damping the bus transients, but also keeping the storage voltage level. Simulation by Matlab Simulink and...
A voltage bus conditioner (VBC) may be used to alleviate the transient bus voltage in a DC distributed power system (DC DPS). The control of the VBC is proposed in this paper adopting the sliding mode control which provides robustness, good dynamic response, and simple implementation. The proposed control method carries out the operation of alleviating the transient voltage on the bus and conserving...
More and all-electric aircraft (AEA) carry many loads with varied functions. In particular, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, a converter with spilt capacitors and a simple adaptive controller is proposed as a Voltage Bus Conditioner (VBC) to mitigate the voltage transients on the bus. The proposed converter...
Distributed Power System (DPS) have many loads with varied functions. In particular, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, a converter with spilt capacitors and an adaptive controller is proposed as a Voltage Bus Conditioner (VBC) to mitigate the voltage transients on the bus. The proposed converter allows the smaller...
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