For Common R or R-L load to apply arbitrary voltage,
the bridge traditional inverters don’t have any difficulties by PWM
method. However for driving some piezoelectric actuator, arbitrary
voltage not a pulse but a steady voltage should be applied.
Piezoelectric load is considered as R-C load and its voltage does not
decrease even though the applied voltage decreases. Therefore it needs
some special inverter with circuit that can discharge the capacitive
energy. Especially for unidirectional arbitrary voltage driving like as
sine wave, it becomes more difficult problem. In this paper, a charge
and discharge circuit for unidirectional arbitrary voltage driving for
piezoelectric actuator is proposed. The circuit has charging and
discharging switches for increasing and decreasing output voltage.
With the proposed simple circuit, the load voltage can have any
unidirectional level with tens of bandwidth because the load voltage
can be adjusted by switching the charging and discharging switch
appropriately. The appropriateness is proved from the simulation of
the proposed circuit.
 Feel-soon Kang, "AC-PDP Sustain Driver using Bidirectional Switches”,
JEET Vol.6, No.1, pp.86-93, 2011.
 S.C.Lee, S.Y.Soh, J.W.Seo and B.K.Kang, "Versatile energy recovery
circuit for driving AC plasma display panel with single sustain circuit
board”, Displays, Volume 27, Issues 4-5, pp.153-160, Nov. 2006.
 F. S. Kang, S. J. Park, J. H. Cho, W. S. Yoon, C. U. Kim,
"High-Performance Sustain Driver for Plasma Display,” IEEE Trans. Ind.
Electron., Vol. 53, No. 4, pp. 1322-1327, Aug., 2006.
 Sun-Ki Hong, Jung-Seop Lee, Nam-HeeByeon, Tae-Sam Kang, Jeong
Hoi Gu, "Energy Recovery Circuit and Asymmetric Voltage Driving
Circuit for Piezoelectric Elements,” The 7th World Congress on
Biomimetics, Artificial Muscles and Nano-Bio (BAMN2013), August
26-30,2013, JejuIsland ,South Korea.
 Sun-Ki Hong, Jung-Seop Lee, Nam-HeeByeon, Taesam Kang, "A Study
of Unidirectional Driving Circuit of Piezoelectric Device Considering
Energy Recovery,” Applied Mechanics and Materials, Vol. 490-491,