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In this paper, a novel current sharing control strategy, named module link, is used to realize multiple modules paralleled. To achieve this goal, there are three full-bridge phase-shift converters are used as three modules and connected in parallel to feed the load. In this study, three phase-shift control integrated circuits, named UCC28950 made by Texas Instruments Co., are used to control individual...
In this paper, a dimmable ac LED driving circuit with high power factor and low total harmonic distortion is presented, which takes series driving via the basic unit mainly constructed by the base of the BJT connected with the drain of the MOSFET. By doing so, the problem in floating driving can be removed, i.e., no additional isolated gate drivers are needed, and furthermore, if any one of LED strings...
Due to recent advocating of the high renewable generation penetration and continuous increasing in load demands, interconnected power systems are subjected to over-rating of circuit breakers and substation equipments. Although various technologies can overcome high short-circuit level problems, none of conventional solutions provides extra transmission capability or ability to control or redirect...
The KY converter, which features fast transient response, non-pulsating output current and simple structure, is a novel step-up topology to overcome the disadvantages of the traditional boost converter. Therefore, in this paper, based on the method of state-space averaging, the KY converter, including the inductor copper resistance and the output capacitor resistance is analyzed and modeled as a small-signal...
The KY boost converter, which combines the KY converter and the traditional synchronously rectified (SR) boost converter, is a novel step-up converter to overcome the disadvantages of the KY converter, which has a quite low voltage gain. Compared with the KY converter, the KY boost converter has one additional inductor and one additional capacitor. Therefore, the dynamic characterization of the KY...
This paper studies that hydrogen fuel cell technology as a CHP, combined heat and power source, could be a viable alternative energy source because of its low noise and high efficiency rates for residential district use. This studied case examples and showed the benefits of exploring stationary fuel cell systems. Not only a payback model was created for each country's fuel cell system, but also a...
In this paper, a single switch isolated voltage-boosting converter is presented, which is derived from the traditional flyback converter and charge pump concept. The proposed converter possesses an output inductor, so the output current is non-pulsating. Moreover, there are several advantages of the proposed converter over the traditional flyback converter, such as higher voltage conversion ratio...
In this paper, a LED dimming circuit, together with the KY converter, is presented, which is controlled based on the field-programmable gate array (FPGA). By a given dimming command and the proposed maximum gate voltage detector, the voltage across the MOSFET in the linear current regulator can be reduced so as to upgrade the efficiency of the overall system. Aside from this, each LED string takes...
This paper details the proposed design of an output filter consisting composing of an inductor (Lo) with a magnetic-shielding ring to suppress the output of common-mode (CM) voltage in an off-line switching-mode power converters (SMPCs) in fault current limiter (FCL) used. The circuit configuration is extremely simple so that it can help reduce the component size as well as the cost. An off-line Flyback-type...
In this paper, a family of secondary-side common-mode (CM) noise suppressers is proposed for off-line switching-mode power supplies (SMPSs) used in fault current limiter (FCL). Not only the operation principle of the proposed secondary-side CM noise suppressers is quite straightforward, but also the circuit configuration is extremely simply. Hence, component size as well as cost of the off-line can...
In this paper, a novel high step-up converter is presented, containing a multi-winding coupled inductor and a charge pump capacitor. Since the charge pump capacitor is connected in series with a coupled inductor, the surge current caused by the capacitor charging can be reduced, thereby causing the life of the capacitor to be prolonged. Above all, the energy stored in the leakage inductance of the...
In this paper, detection of inductor saturation, together with anti-saturation control, is presented, which is applied to a synchronously-rectified (SR) buck converter. Since the inductor maybe sometimes work in a saturation situation, such as overload. In theory, as the inductor is saturated, the corresponding current slope in the inductor will be increased, and such a phenomenon can be used to judge...
A high step-up converter is presented herein, which is constructed mainly by stacking bootstrap capacitors combined with inductor-coupled boost converter with active voltage clamp. Above all, this converter can be implemented based on low turns ratio with the relatively small number of components used. Furthermore, under different input voltages and different output currents, the variations in voltage...
The aims of this paper treats to investigate the hybrid power systems which the fuel cell stack is acted as a main power source and the battery as an energy balancer except for supplying the fuel cell stack's auxiliary power and modulating the excessive or insufficient power for the load to increase the efficiency of proton-exchange-membrane (PEM) fuel cell. Some results shows that the high efficiency...
In this paper, a primary-side control for a series-parallel loosely coupled inductive power transfer systems (SP-LCIPTS) is proposed. Based on the maximum output power criterion, the optimal values of the compensated capacitors for such systems are determined first. Six operation modes to enable the implementation of the proposed primary-side control for the secondary output power are then derived...
As generally acknowledged, the high step-up DC-DC converter is widely used in the sustainable energy system as the front-end stage of the DC-AC converter. Therefore, a high step-up converter combining one coupling inductor and two bootstrap capacitors, together with the active voltage-clamping circuit which pumps portion of the leakage inductance energy to the output, is presented herein. By doing...
In this paper, a primary-side control for a series-parallel loosely coupling power supply (SPLCPS) is proposed. Based on the maximum output power criterion the optimal values of the compensated capacitors for such systems are first determined. To impose the operation constraint of minimum volt-ampere (VA) rating of the inverter, the analytical solutions for the multiple operating frequencies as well...
In this paper, a novel step-up converter is presented, whose operating principle is based on charge pumps and series boost converters. Furthermore, although three switches are used, no isolated gate driver is needed instead of one half-bridge gate driver and one low-side gate driver. Accordingly, the proposed converter is easy in analysis and simple in implementation. In addition, some experimental...
As the electric scooter market grows, one of the major problems facing designers of pure EVs is getting sufficient range from batteries that can't cope with long journeys. The alternative is to have a range extender of hybrid powered scooter in which a small size of fuel cell stack combines with a battery powered electric motor. However, in such models, electric-only range is restricted to just a...
A simple step-up converter, based on charge pumps with one inductor inserted, is presented herein. The proposed converter has individual simple operating analyses—if this converter is operated in the continuous conduction mode (CCM), only two operating modes exist. Furthermore, the power switches used in the proposed converter is easy to drive—only two half-bridge gate drivers and one low-side gate...
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