Design of a Flexible Bandgap Based High Voltage UVLO with Pre-Regulator

Grobe, Jan; Hanhart, Michael; Maul, Fabian; Rolff, Leo; Wunderlich, Ralf; Heinen, Stefan

doi:10.1109/icecs49266.2020.9294922

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…A 8.2 µH inductor is used, which offers a good trade-off between inductor current ripple, magnetic losses and resistive winding losses. The ASIC has a builtin power management circuit for internal supply voltage generation, which is supervised by an undervoltage-lockout circuit, described in [17].…”

Section: Pv-modulementioning

confidence: 99%

An Integrated 50 V Boost Controller With Digitally-Assisted MPPT for Submodule PV Applications

Hanhart

Rolff

Zoche

et al. 2023

IEEE Open J. Power Electron.

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This work introduces an integrated maximum power point tracking boost controller for photovoltaic submodule applications. The IC offers a wide input voltage range from 7 V to 24 V, whereas the output voltage is actively limited to 50 V. The presented design utilizes discrete, low-ohmic MOSFETs for the output stage and thus supports input power levels up to 144 W. The converter operates with peakcurrent-mode control at 300 kHz switching frequency in continuous conduction mode. During light load operation, the control transitions to direct input voltage sensing pulse-frequency-modulation (PFM) with input and output voltage dependent peak inductor current. Moreover, the low-side resistive current sense is explained in detail together with an inductor current replication circuit for precise high-side turn-off. The maximum power point tracker (MPPT) is based on an adjustable resistive sense element and a delta modulator and achieves 99.9 % tracking efficiency, omitting any need for a high resolution analog-to-digital converter (ADC). In addition, the series connection of multiple DC/DC converters is examined. The peak system efficiency measures 98.4 %. The application-specific integrated circuit (ASIC) is manufactured in an 0.18 µm HV-BCD process and occupies 6.25 mm 2 of silicon area.

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Section: Pv-modulementioning

confidence: 99%

An Integrated 50 V Boost Controller With Digitally-Assisted MPPT for Submodule PV Applications

Hanhart

Rolff

Zoche

et al. 2023

IEEE Open J. Power Electron.

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“…LDOs [15], dc-dc converters (such as charge pumps [16][17][18]) and pre-regulators [19] are mainly employed in a low-side N-Type power MOS structure with the power supply relative to ground. Regarding a high-side N-type power device, the floating source demonstrates the high-side driving problem of the device [20,21], which is usually solved by bootstrap charging circuits [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A Bootstrap Structure Directly Charged by BUS Voltage with Threshold-Based Digital Control for High-Speed Buck Converter

et al. 2021

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This article proposes a high-frequency, area-efficient high-side bootstrap circuit with threshold-based digital control (TBDC) that is directly charged by BUS voltage (DCBV). In the circuit, the voltage of the bootstrap is directly obtained from the BUS voltage instead of the on-chip low dropout regulator (LDO), which is more suitable for a high operating frequency. An area-efficient threshold-based digital control structure is used to detect the bootstrap voltage, thereby effectively preventing bootstrap under-voltage or over-voltage that may result in insufficient driving capability, increased loss, or breakdown of the power device. The design and implementation of the circuit are based on CSMC 0.25 µm 60 V BCD technology, with an overall chip area of 1.4 × 1.3 mm2, of which the bootstrap area is 0.149 mm2 and the figure-of-merit (FOM) is 0.074. The experimental results suggest that the bootstrap circuit can normally operate at 5 MHz with a maximum buck converter efficiency of 83.6%. This work plays a vital role in promoting the development of a wide range of new products and new technologies, such as integrated power supplies, new energy vehicles, and data storage centers.

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Design of a Flexible Bandgap Based High Voltage UVLO with Pre-Regulator

Cited by 2 publications

References 4 publications

An Integrated 50 V Boost Controller With Digitally-Assisted MPPT for Submodule PV Applications

An Integrated 50 V Boost Controller With Digitally-Assisted MPPT for Submodule PV Applications

A Bootstrap Structure Directly Charged by BUS Voltage with Threshold-Based Digital Control for High-Speed Buck Converter

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