The inductive power transfer (IPT) technique in battery charging applications has many advantages compared to conventional plug-in systems. Due the dependencies on transformer characteristics, loading profile, and operating frequency of an IPT system, it is not a trivial design task provide required constant current (CC) or voltage (CV) efficiently under condition wide load range possibly defined by profile. This paper analyzes four basic circuits with series-series (SS), series-parallel...

Compensation is crucial for improving performance of inductive-power-transfer (IPT) converters. With proper compensation at some specific frequencies, an IPT converter can achieve load-independent constant output voltage or current, near zero reactive power, and soft switching power switches simultaneously, resulting in simplified control circuitry, reduced component ratings, improved conversion efficiency. However, current depends significantly on parameters the transformer, which often...

LEDs are potential successors of incandescent lamps with high luminous efficacy and long lifetime. To improve the overall luminair lifetime, power efficiency lifetime LED ballasts become important factors. Efficiency gain in transformerless converters appears attractive for applications without isolation. Driving solid-state bulbs an existing lighting fixture such as PAR30 style housing from universal mains necessitates a high-voltage step-down ratio order to produce output voltage about...

Inductive power transfer (IPT) techniques are becoming popular in battery charging applications due to some unique advantages compared the conventional plug-in systems. A high-performance IPT charger should provide with an efficient profile consisting of constant current and voltage. However, a wide load range, it is hard realize initial load-independent (CC) subsequent voltage (CV) using single converter while maintaining nearly unity factor soft switching switches simultaneously. This...

Inductive power transfer (IPT) systems have many unique benefits compared to conventional plugged-in systems. The coupling pads in IPT are inevitably misaligned practical applications, thus leading variations of the transferred and efficiency that necessitate use complicated control for output regulation. A common solution is two converters with opposite trends pad misalignment, so total voltage or current could be kept near constant large variations. However, methods deriving effective...

Inductive power transfer (IPT) technologies have gained a wide acceptance in onboard battery charging applications due to some significant advantages over traditional plug-in systems. An IPT charger is expected provide configurable profile consisting of an initial constant current (CC) and subsequent voltage (CV) efficiently. With load range during the process, two sets topologies with inherent load-independent CC CV at same zero-phase angle (ZPA) frequency are commonly combined into hybrid...

LED light sources, which are more compact, capable to change color in real time, less dissipative, and durable finding applications than conventional bulbs domestic, commercial, industrial environments. However, requirements such as high-power factor, long lifetime, accurate current control, high-efficiency pose challenges the design of ballast circuits. This paper proposes an with a dual noncascading structure. The first-stage structure is isolated current-fed power factor correction (PFC)...

Inductive power transfer (IPT) light-emitting diode (LED) lighting systems have many advantages in commercial, industrial, and domestic applications. Due to the large leakage inductance, primary secondary capacitor compensations are necessary improve capability. To offer a direct current source output for LED driving, topology with series-series (SS) compensation is chosen analyzed this paper. Using properly designed operating frequency, SS can be best voltage-source-input...

Passive or active current balancing circuits are usually used to mitigate imbalance in driving multiple light-emitting-diode (LED) strings. schemes adopting capacitors with high reliability, small size and low cost very popular many applications. However, the reactive power of capacitive scheme variable frequency control will bring stress on VA rating main switches which drive this passive circuit decrease overall efficiency. Fixed does not permit zero-voltage switching (ZVS) under load...

Power-flow control ability of meshed high-voltage direct-current grids can be improved by inserting a dc power-flow controller into the grids. Based on study existing controllers, this paper proposes novel interline (IDCPFC) which has benefit fewer active switching devices, simpler control, little side effect grids, no external power source needed, and wide application occasions. The performance IDCPFC is validated simulation experimental tests. results show that proposed achieve stable in...

Power electronic transformer (PET) is a key apparatus in smart grid system, due to the advantages of power controllability and ac/dc grids interconnection. The four-stage PETs have multiple output ports, good controllability, flexibility, but are limited by conversion stages, complex structure, low efficiency. Therefore, novel modular multilevel converter (MMC)-based PET topology with mixed-frequency modulation proposed reduce stage. decoupling circuits designed realize including medium...

It is well known that there a design tradeoff between voltage regulation and load current sharing in conventional linear droop control for several parallel-connected distributed sources DC microgrid. To improve both performance areas, this article proposes method to identify the nonlinear curve coefficient with desired bus accuracy specified heavy range, while function negative resistance used tighten light range. The procedure of boundary effect resistances on system stability are analyzed...

A constant current (CC) output followed by a voltage (CV) threshold is usually needed for an inductive power transfer (IPT) charger to comply with the battery charging profile. This letter proposes novel clamp coil assisted IPT that features inherent, passive, automatic, and smooth CC-to-CV transition. Since transition eliminates necessity of state-of-charge detection, wireless feedback communication, active control, proposed rugged reliable. The inherent capability also tackles open-circuit...

The transfer performance of inductive power (IPT) systems is greatly affected by the inevitable magnetic pad misalignment. Practical IPT converters are expected to operate satisfactorily under considerable misalignments. Current design, control, and optimization circuits have achieved limited misalignment tolerance. In this article, a family hybrid couplers, which combine conventional bipolar coupler simple series–series topology, proposed achieve high tolerance couplers applicable...

Inductive-power-transfer (IPT) converters should desirably achieve nearly zero reactive circulating power, soft switching of power devices and load-independent constant output voltage or current with optimized transfer efficiency, lowest component ratings. However, the characteristic is dependent on IPT transformer parameters their compensation. The space-constrained restricts design low-order resonant circuit compensated converter, making converter hard to optimize. This paper will analyze...

A modular multilevel converter (MMC)-based multiport power electronic transformer (PET) topology with shared medium-frequency (MFT) is proposed in this brief, where the PET suitable for hybrid AC/DC distribution network because of existence four essential voltage ports, including medium-voltage AC and DC low-voltage ports. Moreover, a multi-frequency modulation design decoupling circuit are introduced. One MFT by three-phase MMC arms, which contributes to compact structure reduced cost PET....

The efficiency of light-emitting-diode (LED) lights approaches that fluorescent lamps. LED light sources find more applications than conventional bulbs due to their compactness, lower heat dissipation, and real-time color-changing capability. Stabilizing the colors red-green-blue (RGB) is a challenging task, which includes color intensity control using switching-mode power converters, point maintenance against junction temperature change, limiting device prolong lifetime. In this paper, we...

High-power dc-dc converter is the essential component for connecting renewable energy sources to medium-voltage dc (MVDC) grids. In this paper, a novel zero-voltage zero-current switching with two full-bridge cells sharing bridge leg and secondary windings of transformers in series proposed MVDC applications. One big feature that required inductance used transmission reduced remarkably even can be embedded transformer some cases. Special but simple control strategy adopted by makes it work...

With the penetration of renewable sources, DC microgrid is much more efficient and flexible to link power generators loads. Due uncertainties in both sources loads, it hard maintain economic optimal operation simultaneously microgrids. To solve it, this paper builds a multi-objective optimization model including cost, loss, load expectation ratio satisfy overall management system economy requirement. fasten optimization, novel hybrid algorithm that combines non-dominated sorting genetic...

The efficiency of LED lights is approaching that fluorescent lamps. light sources are finding more applications than conventional bulbs due to their compactness, lower heat dissipation, and most importantly, real-time color changing capability. Accurate control colors for RGB a challenging task, which includes optical mixing, intensity point maintenance junction temperature change device aging. In this paper , we present measurement technique pulse width modulation (PWM) diode forward...