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Targeting on electromagnetic interference (EMI) regulation and ringing suppression issues in automotive applications, this paper presents a gallium nitride (GaN)-based dc–dc converter operating at 10 MHz. A spurious noise compression technique compresses and re-distributes spurious switching noise within a defined frequency sideband, achieving EMI noise reduction at main switching frequency and its...
To optimize the classic design trade-off between EMI noise and power efficiency in GaN power drivers at 10MHz and beyond, a closed-loop adaptive Miller Plateau sensing (AMPS) technique is proposed. In order to mitigate long delays and low accuracy issues in conventional Miller Plateau (MP) sensing approaches, an emulated MP tracking (EMPT) technique is adopted to achieve instant MP start point sensing...
To optimize the classic design trade-off between EMI noise and power efficiency in GaN power drivers at 10MHz and beyond, a closed-loop adaptive Miller Plateau sensing (AMPS) technique is proposed. In order to mitigate long delays and low accuracy issues in conventional Miller Plateau (MP) sensing approaches, an emulated MP tracking (EMPT) technique is adopted to achieve instant MP start point sensing...
Adaptive on-time (AOT) hysteretic control has gained increasing popularity in automotive electronics, because of its superior line regulation and fast load transient response. However, it faces serious switching frequency deviation and soft start issues from the conventional implementations. To mitigate these, this paper proposes a clock-synchronized AOT hysteretic control which adaptively synchronizes...
An integrated isolated power converter is presented to mitigate efficiency, accuracy and cost challenges on secondary side regulation. It employs time-multiplexing scheme to seamlessly power the non-isolated primary and the isolated secondary output. With the coordination of proposed primary state detection (PSD) circuit, the secondary side output is accurately regulated and automatically synchronized...
As power efficiency becomes essential in automotive applications, DC-DC converters are widely employed [1]. However, size and thermal limits have made it challenging to continue using standard CMOS-based converters. Gallium Nitride (GaN) FETs, on the other hand, have a much higher conductivity with small size/capacitance in comparison to silicon FETs, enabling a highly efficient power conversion at...
With a significant input-to-output conversion ratio from 12V to 1V, single-stage DC-DC conversion solution has obvious benefits on efficiency and cost, compared to the cascaded counterparts, but is generally difficult to control and thus suffers from large regulation inaccuracy. To mitigate these issues, this paper presents a single-stage, adaptive on-time (AOT) hysteretic controlled converter. In...
With a stringent input-to-output conversion ratio (CR) of 20 (24V input and 1.2V output) for a DC-DC converter, two stage cascaded architectures are easy to implement, but suffer from poor efficiency and doubled number of power components. This paper presents a single-stage solution with a proposed Adaptive ON-OFF Time (AO2T) control. In steady state, the control works as an adaptive ON-time valley...
The growing demand for both reliability and performance in automotive electronics has placed mounting pressure on silicon-based power converters to be increasingly reliable and efficient. Automotive electronics operate from the car battery (VIN) which experiences cold-cranks and load dumps that range from 3V to 40V [1]. This requires power converters, supplied by the battery, to withstand the harsh...
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