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Parallel dimming for reducing the intensity of high power light-emitting diode (HP-LED) is an effective way of achieving high contrast ratio and wide dimming range. However the scheme has limitation due to response of control loop and higher power dissipation due to losses during turn-off period. Therefore shorting-inductor approach is proposed in this paper which is capable of achieving improvement...
This paper proposes a novel phase-shift plus duty cycle controlled hybrid bi-directional DC-DC converter based on fuel cells and supercapacitors. The described converter employs two high frequency transformers to couple the half-bridge and full-bridge circuits together in the primary side and voltage doubler circuit in secondary side. Boost type converter can limit the output ripple current of the...
Contactless power transmission system with the advantages of safety and convenience has been applied to daily supplies. However, general contactless power transmission charger cannot control the current cause there is no charge controller in secondary side and the severe limitation between primary and secondary sides of the battery charger cause difficulty to design. This study provides the charge...
Inductor-less half-bridge piezoelectric transformer based resonant converters can offer considerable reductions in mass and form factor over their discrete counterparts. This work presents an analytical model for calculating the load and frequency range over which such converters can achieve ZVS given the large input capacitance these transformers typically present.
Flyback converters are widely used in consumer electronic products and other applications that require low cost isolated power supply with less than or around 200W output power. Transition Mode is one method to control the Flyback converters. This control method has the advantage of soft-switching turn-on, which greatly reduces the turn-on loss. This paper discusses the design of a CMOS Transition...
In this paper, a two-phase interleaved boost converter with low switch voltage stress and automatic current-sharing capability is proposed for single-phase power factor correction (PFC). First, a forward-type converter is integrated with the first phase to achieve much higher voltage conversion ratio and avoid operating at extreme duty ratio. Then, two capacitors are added as voltage dividers for...
This paper presents flyback converter combined with single-capacitor turn-off snubber for auto-tuning fan rotational speed system. The proposed system can automatically regulate rotational speed of fan, depending on temperature in the chassis of the equipments. Its control algorithm is to regulate output voltage of the proposed converter. With this approach, the wear and tear of the bearing of fan...
A single switch multi-inductor buck-boost converter topology is presented for paralleling LED-networks. The proposed technique is based on discontinuous inductor currents to achieve a homogenous light-distribution of parallel connected high-brightness LEDs. In contrast to the common approach of driving LED-strings with constant-current, the proposed topology supplies the LEDs with constant-power....
This paper presents the zero voltage switching (ZVS) PWM dual full bridge (DFB) DC-DC converter with secondary-side phase-shifting power control scheme. The soft-switching PWM DC-DC converter newly developed for a DC pre-regulator in a plasma radio frequency (RF) power generator can achieve soft commutation at all the power devices under the wide range of load power. By introducing the phase-shifting...
The grid-connected photovoltaic generation system is the most important one in the field of photovoltaic application. In this paper, a model of photovoltaic has been constructed based on the main circuit of single phase grid-connected generation system using MATLAB/simulink to program it. The double closed loop control structure is adopted and forward-feed compensation method is employed to the system...
Higher luminance efficacy, faster response, lower power consumption, longer operation life, wider color gamut and environmental issues makes RGB LED backlight driving system suitable for high end LCD applications. In this paper, a sequential-color voltage-adaptable RGB LED backlight driving system with local dimming control for LCD panels is proposed. Using the topology proposed in this paper, the...
This paper presents a novel single stage power converter for photovoltaic energy conversion application. The presented power converter consists of a boost type resonant circuit from which both DC and AC outputs are generated. The DC output is used to charge batteries and the AC output is applied for lighting purpose. A mixed maximum power point tracking algorithm is realized by using the boost characteristic...
An isolated bi-directional full-bridge DC-DC converter with high conversion ratio, high output power and soft start-up capability for battery charging/discharging is proposed in this paper. The use of a capacitor and a flyback converter can clamp the voltage spike caused by the current difference between the current-fed inductor and leakage inductance of the isolation transformer, and can reduce the...
Nowadays, there is a tendency to increase the capacity of wind turbines, multilevel converter is a realistic alternative in such high power applications. As the wind power penetration continues to increase, grid codes have been revised to require wind farms to operate as conventional power plants. This paper proposes a reconfiguration scheme of control strategies for doubly fed induction generator...
This paper proposes a novel single-phase ac to high voltage dc converter based on Cockcroft-Walton cascade rectifier with only adding one bi-directional switch and one boost inductor. This paper also derives a new method of circuit representation for Cockcroft-Walton cascade rectifier, which simplifies the equivalent circuit and is convenient for simulation. Compared with conventional Cockcroft-Walton...
In this paper, a half-bridge single-stage power converter is used as a fundamental study object. The half-bridge single-stage power converter proposed in this thesis has inherent gift of high power factor correction (PFC) even when the PFC inductor operates in discontinuous conduction mode (DCM). It is revealed that if the proposed converter is operating in DCM, it not only inherently has high power...
This paper proposes an active-clamping zero-voltage-switching (ZVS) isolated inverse-SEPIC converter. The high voltage spikes when turning off the switches are eliminated. The energies stored in the parasitic elements can be recycled to achieve the ZVS of switches. Therefore the converter efficiency increases substantially, and the circuit cost is also reduced. Detailed analysis and design of this...
In this paper, a review of Bridgeless Boost power factor correction (PFC) converters is presented at first. Performance comparison on conduction losses and common mode electromagnetic interference (EMI) are analyzed between conventional Boost PFC converter and members of Bridgeless PFC family. Experiment results are given to validate the efficiency analysis and EMI model building.
Active front-end converters with bidirectional power flow capability have been extensively used for utility applications of power electronics. Large passive filters are normally required at the grid side of the converter to mitigate switching EMI noise. This may become a critical issue, in terms of installation space and potential resonance of the passive filter. This paper proposes a hybrid active...
The objective of this paper is to demonstrate a fully digital controller for interleaving DC/DC converter. In this paper, a new adaptive control method is proposed to improve the dynamic performance in rapid load current slew rate requirement. This control architecture is according to PID controller with Gain Scheduling architecture and based on pole-zero cancellation method to build the parameters...
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