| 摘要 |
This invention relates to electronic circuit, which converts a low voltage direct current power to high voltage and high current pulses suitable for driving piezoelectric manipulators and scanners using autonomous miniature portable energy sources. It overcomes the problems associated with energy losses in traditional high voltage amplifiers and eliminates the need of feed-through connections for operation of piezoelectric devices inside pressure sealed volumes, such as controlled gas mixture or vacuum chambers. The solution consists of two stage voltage boost converters and full field-effect transistor bridge with pulse width limiter, which is using the internal capacitance of the piezoelectric device and generates the required voltage waveform for inertial slider operation. The solution also provides means to operate said piezoelectric devices in scan mode of motion. The solution has additional advantages compared to existing drivers of piezoelectric manipulators, namely, during inertial motion the displacement of said piezoelectric device is unidirectional, and the system relaxes to zero velocity after completion of the inertial step. This solution also includes method to change the inertial step length and direction using the same circuit. |
