Highly Efficient Linear Power Amplifier for Driving Fast Slew Rate Capacitive Loads

Vasic, Miroslav and Boere, Eric and García Suárez, Oscar and Alou Cervera, Pedro and Oliver Ramírez, Jesús Angel and Eltze, Jens and Cobos Márquez, José Antonio (2017). Highly Efficient Linear Power Amplifier for Driving Fast Slew Rate Capacitive Loads. In: "2017 IEEE Applied Power Electronics Conference and Exposition (APEC)", March 26 – 30, 2017, Tampa, USA. pp. 2150-2156. https://doi.org/10.1109/APEC.2017.7930997.

Description

Title: Highly Efficient Linear Power Amplifier for Driving Fast Slew Rate Capacitive Loads
Author/s:
  • Vasic, Miroslav
  • Boere, Eric
  • García Suárez, Oscar
  • Alou Cervera, Pedro
  • Oliver Ramírez, Jesús Angel
  • Eltze, Jens
  • Cobos Márquez, José Antonio
Item Type: Presentation at Congress or Conference (Article)
Event Title: 2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
Event Dates: March 26 – 30, 2017
Event Location: Tampa, USA
Title of Book: 2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
Date: 2017
Subjects:
Freetext Keywords: Envelope tracking, Multilevel converter, Power Amplifier, piezoelectric
Faculty: E.T.S.I. Industriales (UPM)
Department: Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The modern Inkjet printer is able to place millions of tiny ink droplets precisely on a paper, fabric or even ceramic to create an image. The piezoelectric technique of inkjet printing employs a crystal that flexes whenever a voltage pulse is applied to the piezo transducer. A representative printing head configuration might employ a single Power Amplifier (PA) to drive up to 1024 nozzles with an equivalent load of approximately 100nF. The simplest voltage form that is used for driving the ink jet printer head is a trapezoidal waveform, which has controlled amplitude and ramps. Because of the needed voltage shape, linear power amplifiers (class B, AB) are normally employed, sacrificing efficiency for the quality of the voltage pulse. In this paper we present a highly efficient solution for the PA that drives an ink jet head with voltage pulses as high as 130V with slew rates of 45V/us and as fast as 110 kHz. The solution is based on an Envelope Tracking approach, i.e. the linear PA is supplied by a varying supply voltage and in that way avoiding high power losses in the linear PA, while preserving good characteristics of the output voltage. Due to the extremely fast slew rate (45V/us) and very high instantaneous power that must be supplied to the load (up to 800W), the varying voltage is implemented using a multilevel converter. By using the proposed solution the power losses can be cut down as much as 50% as it is shown by experimental results.

More information

Item ID: 51116
DC Identifier: http://oa.upm.es/51116/
OAI Identifier: oai:oa.upm.es:51116
DOI: 10.1109/APEC.2017.7930997
Official URL: https://ieeexplore.ieee.org/document/7930997
Deposited by: Memoria Investigacion
Deposited on: 17 Oct 2018 18:01
Last Modified: 17 Oct 2018 18:01
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