Triboelectric-piezoelectric hybrid nanogenerator based on BaTiO3-Nanorods/Chitosan enhanced output performance with self-charge-pumping system

The paper focuses on the study of operation of an inverting DC-DC converter with charge pumping and LDO, which are the part of the combined bipolar secondary power supply LM 27762. The measurements covered two modes amply included in the range of normalized parameters with input voltages equal to 3.5 and 5.5 V, and output voltages 1.8 and 4.9 V, respectively, as well as the mode with an input voltage of 5.0 V and an output voltage 4.7 V, with a difference in the input and output voltage not exceeding the normalized limit of the voltage drop across LDO . Pulsations of voltages were measured at various load currents from 15 to 250 mA at the positive and negative poles of the flying capacitor, at the output of the charge pumping system and, in the latter case, also at the output of the microcircuit. Based on the results obtained, it was shown for the first time how at low load currents up to about 100 mA the charge pumping system operates in the burst mode, and at higher currents, it operates in the charge pumping mode with a constant frequency

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Charge pumping system operation in the buck mode of the MCP1253DC-to-DC converter

Journal of «Almaz – Antey» Air and Defence Corporation ◽

10.38013/2542-0542-2018-1-10-22 ◽

2018 ◽

pp. 10-22

Author(s):

V. K. Bityukov ◽

V. A. Petrov ◽

A. A. Sotnikova

Keyword(s):

Integrated Circuit ◽

Output Voltage ◽

Charge Pump ◽

System Operation ◽

Load Current ◽

Charge Pumping ◽

Pumping System ◽

Input And Output ◽

Capacitor Voltage ◽

First Time

The paper presents investigation results concerning output ripple voltage and flying capacitor voltage in the integrated circuit of the MCP 1253 charge pump DC -to- DC converter operating in buck mode with various combinations of input and output voltage values (5.1 and 3.5 V, 5.1 and 4.8 V, 3.26 and 3.02 V, 2.59 and 2.18 V,2.52 and 1.71 V, 2.17 and 1.71 V) when load currents vary of 5…100 mA. The results obtained allowed us to show for the first time that operation algorithms of the charge pumping system in the MCP 1253 integrated circuit depend on the ratio of input to output voltage and variations in the load current.

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Vacuum System to Minimize the Specimen Contamination of High-Performance EM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100077967 ◽

1977 ◽

Vol 35 ◽

pp. 68-69

Author(s):

N. Yoshimura ◽

K. Shirota ◽

T. Etoh

Keyword(s):

Electron Microscope ◽

High Speed ◽

High Performance ◽

High Vacuum ◽

Vacuum System ◽

Pump System ◽

Pumping System ◽

Diffusion Pump ◽

Almost All ◽

Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

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