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ELECTRONIC DEVICE AND CIRCUIT FOR PROVIDING TACTILE FEEDBACK

  • US 20090072662A1
  • Filed: 09/17/2007
  • Published: 03/19/2009
  • Est. Priority Date: 09/17/2007
  • Status: Active Grant
First Claim
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1. A circuit for controlling a piezoelectric actuator comprising:

  • a piezoelectric actuator drive circuit operative to generate a unidirectional voltage drive signal, comprising a charging circuit operatively responsive to a first pulse-width-modulated control signal and a pulsed current sink discharge circuit operatively responsive to a second pulse-width-modulated control signal and operative to controllably draw packets of charge from a charged piezoelectric actuator.

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