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Partial shading on a photovoltaic (PV) module is known to trigger serious issues of significant reduction in power generation and occurrence of multiple power point maxima. Among various kinds of voltage equalizers that have been proposed to preclude the partial shading issues, switched capacitor converters (SCCs) are known as a simple and small solution. To achieve even smaller circuit at lower cost,...
In this paper a detailed description of the design and simulation of a DC ultra-fast recharging station for Electric Vehicles is carried out. The system consist of a single AC/DC grid connected inverter, a DC-Bus and two DC/DC converter to recharge the batteries of the EVs. The system also has the vehicle-to-grid (V2G) capability. The design of the components of the system and the control schemes...
This paper proposes a power-efficient capacitor-array-based digital-to-time converter (DTC) using a constant-slope approach. Fringe-capacitor-based digital-to-analog converter (C-DAC) array is used to regulate starting supply voltage of the constant slope fed to a fixed threshold comparator. The proposed DTC consumes only 15 μW from a 1V supply, while achieving fine resolution of 103 fs when running...
This paper demonstrates that our very thin film STO capacitor can be located under re-distribution layer (RDL) of WLP/FO-WLP package and is effective for reduction of the power supply noise of LSIs. Their Shmoo plots show improvement of operable frequency and power supply voltage reduction, as results of the improved power integrity realized by our Sub-RDL STO thin film capacitors.
We have proposed a power supply circuit and an electrical interconnect test method based on charge volume supplied from the power supply circuit. We optimize the supply circuit so as for small resistive open defects that occur at interconnects among dies in 3D stacked ICs to be detected by the test method. We examine what resistive open defects can be detected with the optimized power supply circuit...
This paper reports on a large-size CPU package for UNIX servers which employs embedded thin film capacitor layers. The substrate of this package has two thin film capacitor layers in the surface of the core layer, which has a capacitance of 25 uF in total. In order to adopt this package substrate, we confirmed the effect of the thin film capacitor layers on the package assembly process. We actually...
A 10-bit single-channel SAR ADC is designed in a 130nm CMOS technology. An original DAC is proposed, merging a binary-weighted structure and a C/2C topology in order to reduce overall energy consumption. A built-in calibration circuit improves the conversion accuracy. The proposed SAR ADC samples at 6.66MHz, achieving a SNDR of 49.78 dB for a 1MHz input signal (ENOB of 8 bits). The simulated INL is...
A novel capacitive power transfer (CPT) structure through self-capacitance routes is proposed in this paper. Selfcapacitance is the nature property of an isolated conductor which represents the amount of charges that have to be added to a conductor to promote its potential by one unit with respect to infinity. By utilizing the self-capacitance effects, one of the two coupling capacitors for conventional...
The paper presents a comprehensive charge modelling approach for field-effect transistor (FET) devices. For the first time an artificial neural network (ANN) is combined with the division-by-current approach to FET charge modelling. Using this technique a large-signal charge model is extracted for a 10 W GaN device from MACOM. It is shown through measurements that excellent results may be obtained...
In high-power converters based on SiC-MOSFET half-bridge modules, laminated busbar plays a critical role in linking the DC capacitor bank to power modules. The busbar stray capacitance has the same order of magnitude with drain-source capacitance of SiC-MOSFET and has a great impact on the turn-off voltage oscillation of SiC-MOSFET. In this paper, parasitic elements of a three-layer laminated busbar...
DC-link capacitors are usually utilized in voltage source converters to stabilize the DC-link voltage and suppress the transmission of current harmonics into the power grid. To guarantee the reliability of voltage source converters, in addition to select the DC-link capacitors with optimum capacitance, appropriate rated voltage and enough ripple current capacity, thermal design is also of great importance...
In this paper, the single-stage Maximum Power Point Tracking (MPPT) control strategy for the Aalborg photovoltaic inverter is presented. Aalborg inverter has many advantages, such as high efficiency, wide range of input voltage, minimum voltage drop of the filtering inductors, etc. Nevertheless, it is essentially a “half-bridge” inverter with two input sources, where one source works in MPPT mode,...
SiC JFET bi-directional switches (BDS) are widely used in construction of matrix converters, multi-level converters, solid state switches, etc. In this research work, the phenomenon of unwanted turn-on (UTO) of SiC JFET-based BDS and its related constant envelop oscillation is investigated. This phenomenon is critical to power conversion systems' stability and reliability. Firstly, the roots of UTO...
Modular multilevel converter (MMC) has been proved a prospective topology in high voltage and high power occasions. Hybrid MMC mixed with half-bridge (HB) and full-bridge submodules (FBSMs), which achieves a good tradeoff between power devices quantity and dc short circuit fault handling capability, attracts extensive attention. In this paper, the characteristics of SM capacitor voltage ripples are...
A delta-structured switched-capacitor equalizer (DSSCE) is proposed to achieve the automatic any-cells-to-any-cells (AC2AC) balancing for a long battery string, leading to the fast-speed and high-efficiency balancing. Only two switches are required for each battery cell, and one capacitor is set for any two cells, materializing the delta-structured switched capacitors (SC). All MOSFETs are triggered...
Lifetime of aluminum electrolytic capacitors is of paramount importance, since in many power electronic voltage source converter systems this capacitor type is used in the DC-link. Thermal stress is one of the most critical stressors for electrolytic capacitors leading to wear-out and failures. Therefore, methods to perform online monitoring of the hotspot temperature of capacitors would lead to beneficial...
Reliability of dc-link capacitors in modern design of power electronic converters is an important aspect that needs to be considered. The requirement of applying condition monitoring for health status estimation in many reliability-critical applications have been a focused demand. The existing capacitor condition monitoring methodologies are suffering from shortcomings such as, low estimation accuracy,...
This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
This paper presents a power pulsation decoupling strategy for a two-stage single-phase photovoltaic (PV) inverter with film capacitor, which has small capacitance and large voltage ripple. Such large voltage ripple at DC bus is propagated to the PV array and decreases the maximum power point tracking (MPPT) efficiency. To maintain the MPPT efficiency, a new small-signal model which considers the DC...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
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