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In this paper, a current-balancing converter is proposed herein and applied to driving LED strings paralleled, so as to make the required current shared among LED string. There are two stages of the proposed current-balancing converter. The first stage is one buck converter under constant current control and transfers DC current to AC current, whereas the second stage is passive AC-DC rectifiers with...
This paper proposes a novel fixed-frequency sliding mode (SM) controller of buck converters in CCM (continuous conduction mode), which almost holds the advantage of robustness and fastness of SM control. The design method of a new SM controller for buck converter is given. Simulation and experimental results verify the validity and feasibility of the fixed-frequency modulation method in Buck converter...
The combination of non-linear control and linear control proposed provides very fast transient response (voltage step from 1 V to 1.5 V in 2 mus). This non-linear control is based on hysteretic control of the Cout current. This system is very sensitive to effects like aging, temperature, input and output voltage variation, etc., that modify the switching frequency. This paper proposes a frequency...
In a commutation cell, the implementation of IGBT and MOS requires an insulated signal. Traditionally, the insulated signal is carried out by a DC supply with a high insulation transformer for energy transmission and an optical fiber or pulse transformer for the switch control information. A new approach seems promising: the switch control information by a wireless transmission. Analog or digital...
In this paper, a small signal model of hysteretic current mode control with variable frequency and fixed hysteretic band is presented, based on three terminal averaged switch cell of buck converter in continuous current mode. This model reveals that the averaged current is the control target of hysteretic control. And phase lag of current loop with high switching frequency is quite small that makes...
In order to adhere to voltage regulation criteria, capacitor selection of a Buck converter must be based on the worst possible scenario. It is well known that, for a low duty cycle Buck converter, the output voltage deviation of a Buck converter undergoing an unloading transient will be significantly larger than that of a corresponding loading transient of equal magnitude. Therefore, in this paper,...
In this paper, a novel self-driven zero-voltage-switching (ZVS) non-isolated full bridge (FB) converter is presented for 12 V input VRM application. Existing multiphase buck controller and buck driver can be directly used in the proposed converter. The advantages of the proposed converter are: (1) duty cycle extension; (2) significant switching losses reduction due to ZVS of all the control MOSFETs;...
The paper focuses on a new generation of power modules, trying to optimize the tradeoff between thermal and EMI managements. At the same time, the packaging approach is considered in order to simplify the implementation of the power dies while improving the reliability of the structure. The approach considers the hybrid integration of the power dies, one on top of the other into a 3D chip on chip...
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