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With miniaturization development of switching mode power supply, electro-thermal interaction inside the power supply cannot be ignored. Realization of electro-thermal coupling simulation involves multiple software interfaces and automatic calling. There is a lack of usable integrated software platform at present, which has restricted application of electro-thermal coupling in switching mode power...
This paper proposes an isolated DC-DC converter for Power-Supply on chip (SoC) realized by the couple of air-core coils. The pro-posed isolated DC-DC converter is evaluated by numerical simulations and experimental results. The fabricated prototype DC-DC converter works well and the simulation results are good agreement with experimental results. This paper also discusses the potential of proposed...
This paper presents a comparison of dissipation between LLC and phase shift converters under the same size condition using a manufactured power supply. Moreover, it is clarified that the ratio of the transformer dissipation for the overall dissipation of LLC is much higher than that of the phase shift converter. In addition, we show that the winding resistance decreases by improving the coupling between...
Some power supplies do not require accurate current feedback to function properly. In many cases the information about the output current is only needed to make sure that the power supply is not overloaded. This paper describes a sensing method of individual secondary currents of a four channel power supply built using a single core transformer, by sensing the currents flowing in separate primary...
In order to merge low power and high voltage devices on the same chip at competitive cost, Smart Power integrated circuits (ICs) are extensively used. Electrical noise induced by power stage switching or external disturbances generates parasitic substrate currents, leading to a local shift of the substrate potential which can severely disturb low voltage circuits. Nowadays this is the major cause...
This paper presents the behaviour of a full-bridge topology for an IPT system, considering misalignment impacts, and the design of a full-bridge isolated converter for an EV on-board charger fed by this IPT system. The double galvanic isolation is required since this on-board charger is expected to work also directly from the mains. The paper presents a brief description of the proposed IPT system...
In this paper, a half-bridge LLC resonant converter with a loose-coupling transformer and a transition capacitor is analyzed and implemented. The LLC resonant tank is comprised with a loose-coupling transformer and a series-resonant capacitor. For transiting the resonant current of the switching transistors and improving the zero-current turn off of the rectifying diodes, a small transition capacitor...
Electric Vehicles (EVs) are quickly gaining widespread interest as attractive alternatives to conventional petrol driven vehicles. If EVs can derive some or all of their electrical power from renewable sources, then they can significantly help to reduce global dependence on fossil fuels for transportation. Inductive power transfer (IPT) is a method that can transfer power to EVs over an air-gap without...
Inductive Power Transfer (IPT) is a technique used for contactless power transfer from one system to another across a large air gap. The technology had been proposed for Electric Vehicle (EV) charging applications, and over the years the power transfer capability between the loosely coupled systems has improved. In this paper, the two most commonly used methodologies for unidirectional and bidirectional...
Inductively Coupled Power Transfer (ICPT) systems are designed to deliver power efficiently from a stationary primary source to movable secondary loads over air gaps via magnetic coupling. Present vehicle chargers are wired. Corrosion of connectors is a very serious problem. Frequent replacement and maintenance are needed for proper operation. For charging different vehicles with different battery...
With the respect of building environmentally friendly city, Inductive Power Transfer (IPT) applied in urban light rail transportation has been regarded as an effective way. There are two main topics in IPT power transfer system. The first is to optimize the structures of the track transformer and pick-up to achieve high power transfer efficiency. The second is concerned on whether the Electro Magnetic...
In order to study the influence of continuous high-frequency voltage pulse to insulation life of inverters, to get electrical life information of insulating material about new recipes and new techniques as quickly as possible under condition that the insulation failure mechanisms should not be changed, one power supply for insulation aging test device using the cascaded method is designed. The main...
In this paper, we will present a diagnostic test case of a hard-to-find fail condition causing an unexpected partial power on of a chip fabricated in IBM 65 nm bulk technology. In particular, we will describe the fail condition as well as the combined use of electrical testing, optical methodologies, and detailed circuit analysis that were used to reach a successful root cause identification of the...
This paper proposes a new two-stage converter with a coupling capacitor and a coupled inductor. In order to downsize the two-stage converter, two inductors are tightly coupled together. Circuit operation is described in detail. Steady state analysis is performed and confirmed by experiments. It is clarified that the proposed converter has advantages of larger voltage conversion ratio and higher power...
A simple and easy magnetic coupling equalizer for a series-connected lithium-ion battery string is presented. The equalizer applies identical duty cycle to all active power switches without using the voltage sensing circuits and the secondary side components of multi-winding transformer. During the turn-on switching interval, the equalizer automatically transfers energy from the high-voltage battery...
This paper investigates the impact of coupling variations in an IPT lumped coil system on the overall system behaviour. An analysis of the reactive power flow between the pick-up and the primary power supply in a variable coupling system is presented. A 1.2kW battery charging system design example was conducted on how to design the resonant networks to minimize the burden on the primary power supply...
Power integrity has become increasingly important for the designs in 32nm or below. This paper discusses a silicon-validated methodology for microprocessor power delivery modeling and simulation. There have been many prior works focusing on power delivery analysis and optimization. However, none of them provided a comprehensive modeling methodology with postsilicon data to validate the use of the...
In this paper, a dual-output boost converter with positive and negative output voltages under a single positive voltage source fed. Due to its dual output with positive and negative output voltages, this converter is very suitable for driving the half-bridge class-D amplifier, so as to remove a DC blocking capacitor required in the half-bridge class-D amplifier. Firstly, the basic operating principles...
A wireless power supply system based on inductive coupling approach has been developed for implantable biomedical devices that achieves excellent transducer performance by obviating the need for electrical connectors. In this paper, we report in detail the modeling and electrical analysis of an inductive power link for activation of microwatt electronic implants. As the biomedical application requires...
The Driven-Right-Leg (DRL) circuit has been used for about 50 years to reduce interference due to common-mode voltage in biopotential amplifiers in scenarios that range from fixed equipment supplied from power lines to battery-supplied ambulatory monitors, and for systems that use gelled, dry, textile, and capacitive electrodes. However, power-line interference models predict that for isolation amplifiers,...
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