Linear distribution of capacitance in Dickson charge pumps to reduce rise time

Ballo, Andrea; Grasso, Alfio Dario; Palumbo, G.; Tanzawa, Toru

doi:10.1002/cta.2761

Cited by 21 publications

(9 citation statements)

References 23 publications

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“…In the second case, where the frequency of the clock signal is imposed by the adopted piezoelectric transducer, the widest adopted is Cockcroft-Walton CP, and it implements the AC-DC conversion. It is worth noting that also the cross-coupled structure can be exploited to realize diodes for CPs [32,33]. They are essentially latch-configured inverters with V OUT similar to the dual-branch charge pumps [6], but the pumping capacitances of a single stage are halved.…”

Section: Conventional Topologies For Ac-dc Conversionmentioning

confidence: 99%

A Review of Power Management Integrated Circuits for Ultrasound-Based Energy Harvesting in Implantable Medical Devices

2021

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This paper aims to review the recent architectures of power management units for ultrasound-based energy harvesting, while focusing on battery-less implantable medical devices. In such systems, energy sustainability is based on piezoelectric devices and a power management circuit, which represents a key building block since it maximizes the power extracted from the piezoelectric devices and delivers it to the other building blocks of the implanted device. Since the power budget is strongly constrained by the dimension of the piezoelectric energy harvester, complexity of topologies have been increased bit by bit in order to achieve improved power efficiency also in difficult operative conditions. With this in mind, the introduced work consists of a comprehensive presentation of the main blocks of a generic power management unit for ultrasound-based energy harvesting and its operative principles, a review of the prior art and a comparative study of the performance achieved by the considered solutions. Finally, design guidelines are provided, allowing the designer to choose the best topology according to the given design specifications and technology adopted.

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Section: Conventional Topologies For Ac-dc Conversionmentioning

confidence: 99%

A Review of Power Management Integrated Circuits for Ultrasound-Based Energy Harvesting in Implantable Medical Devices

2021

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“…It has advantages such as ease of on-chip integration, being lightweight, and high-power density. The voltage conversion ratio of SC converters could be easily expanded through cascaded multiple SC cell topologies [14][15][16][17][18]. However, without the magnetic components, the current spikes will appear in the charge loop and discharge loop of a capacitor [19].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of N-Branch Hybrid Switched Inductor and Capacitor Converter

Yang

et al. 2021

Electronics

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This paper proposes a family of N-Branch hybrid switched inductor and capacitor (SLC) converters. With the single circuit, the multi-level output voltage or current could be generated. The proposed converter is suitable both for the voltage source and the current source. The same LC network is reused for different LC branches. The proposed converter is controlled by the phase shift control method with a time domain multiplexing concept. The N level circuit is operated with the same frequency. One cycle period is divided into N small time cycles for each branch. The phase shift for each branch is . The load voltage could be changed by modifying the duty cycle of the transistor. When the SLCs work in the resonant condition, the soft switching will be acquired. The power loss of transistors could be sharply reduced. In this paper, a 300 W SLC converter is constructed to verify the theoretical analysis and operation mechanism in the resonant condition and hard switching condition. With the experimental and simulated verification, the soft switching and the stable multi-level output voltage or current are achieved. The proposed SLC converter could be used for the multi-level voltage power supply system, such as the electric vehicle, the electric aircraft, autonomous underwater vehicles (AUVs) and a new energy generation system.

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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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Linear distribution of capacitance in Dickson charge pumps to reduce rise time

Cited by 21 publications

References 23 publications

A Review of Power Management Integrated Circuits for Ultrasound-Based Energy Harvesting in Implantable Medical Devices

A Review of Power Management Integrated Circuits for Ultrasound-Based Energy Harvesting in Implantable Medical Devices

Modeling and Analysis of N-Branch Hybrid Switched Inductor and Capacitor Converter

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

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