Piezoelectric actuator system
First Claim
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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Accused Products
Abstract
A piezoelectric actuator has at least two piezoelectric actuator elements connected in series with each other mechanically and electrically and form a half bridge in an amplifier bridge circuit having a further half bridge formed by two series connected electronic switches which are operated or clocked by a control circuit such as a pulse modulator circuit for periodically energizing the piezoelectric actuators in push-pull fashion. A choke (22) is connected between the junction point (JP1) of the two piezoelectric actuators and the junction point (JP2) between the two electronic switches (23, 24) for assuring a loss free reverse charging of the two piezoelectric actuators functioning as electrical capacitors in the energizing bridge circuit (21). The choke 22 functions as an energy storage and the stored energy is used in the push-pull charging of the capacitors (19, 20) formed by the piezoelectric elements.
78 Citations
10 Claims
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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.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification