Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Highly efficient linear power amplifier for driving fast slew rate capacitive loads
Year:2017
Research Areas
  • Electric engineers, electronic and automatic (eil)
Information
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.
International
Si
Congress
IEEE-APEC2017
960
Place
Tampa, USA
Reviewers
Si
ISBN/ISSN
978-1-5090-5366-7
10.1109/APEC.2017.7930997
Start Date
26/03/2017
End Date
30/03/2017
From page
2150
To page
2156
Proceedings of IEEE-APEC2017
Participants
  • 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
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