Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Highly efficient linear power amplifier for driving fast slew rate capacitive loads
Research Areas
  • Electric engineers, electronic and automatic (eil)
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.
Tampa, USA
Start Date
End Date
From page
To page
Proceedings of IEEE-APEC2017
  • Autor: Miroslav Vasic (UPM)
  • Autor: Oscar Garcia Suarez (UPM)
  • Autor: Pedro Alou Cervera (UPM)
  • Autor: Jesus Angel Oliver Ramirez (UPM)
  • Autor: Jose Antonio Cobos Marquez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Electrónica Industrial
  • Centro o Instituto I+D+i: Centro de Electrónica Industrial. CEI
  • Departamento: Automática, Ingeniería Eléctrica y Electrónica e Informática Industrial
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)