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Piezoelectric actuator system

  • US 6,411,009 B2
  • Filed: 12/18/2000
  • Issued: 06/25/2002
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Fees
First Claim
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1. A piezoelectric actuator system comprising an amplifier bridge circuit (21) including a first piezoelectric actuator (1, 19) forming a first quarter bridge branch, a second piezoelectric actuator (2, 20) forming a second quarter bridge branch, said first and second quarter bridge branches being connected in series with each other thereby forming a first half bridge having a first junction point (JP1) between said first and second piezoelectric actuators (1,19;

  • 2,20), a first electronic kilo switch (23) forming a third quarter bridge branch, a second electronic switch (24) a fourth quarter bridge branch, said third and fourth quarter bridge branches being connected in series with each other thereby forming a second half bridge comprising a second junction point (JP2) between said first and second electronic switches (23, 24), said first and second half bridges being connected in parallel with each other to form a full bridge, a third junction point (JP3) between said first and second half bridges, and a normally grounded fourth junction point (JP4) between said first and second half bridges, a choke (22) connected to said first and second junction points (JP1, JP2), a power supply (U+,) connected to said third junction point (JP1), and a control circuit (25) connected to said first and second electronic switches (23, 24) for opening and closing said electronic switches to energize said first and second piezoelectric actuators.

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