JPH0199637U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a piezoelectric actuator excitation drive device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the gap of the coil core and iron core of the device shown in FIG. Figure 3 is a diagram showing the BH curve of the core of the coil in Figure 1, and Figure 4 is a waveform diagram of each part of the device in Figure 1, where a is the drive signal, b is the charging current, and c is the piezoelectric element. , d is a diagram showing the coil voltage, and FIG. 5 is a waveform diagram of each part of the device in FIG. 1 using the coil with the characteristics shown in FIG. 3. a is the drive signal, b is the charging current, and c is the voltage of the piezoelectric element,
d is a diagram showing each coil voltage, FIG. 6 is a circuit diagram of a conventional piezoelectric actuator excitation drive device,
Figure 7 is a waveform diagram of each part of the circuit in Figure 6, where a is the drive signal, b is the charging current, c is the voltage of the piezoelectric element, and d
are diagrams showing the tip displacement of the enlarged frame, respectively.
Figure 8 is a circuit diagram of a conventional piezoelectric actuator excitation drive device, and Figure 9 is a waveform diagram of each part of the circuit in Figure 8, where a is the drive signal, b is the charging current, c is the voltage of the piezoelectric element, and d is the Figure 10 is a diagram showing the displacement of the tip of the enlarged frame, and Figure 10 is a waveform diagram of each part when the conditions are changed in the circuit of Figure 8, where a is the drive signal, b is the charging current, c is the voltage of the piezoelectric element, d is a diagram showing the displacement of the tip of the enlarged frame. 15... Microcomputer, 16, 17...
...Signal line, 18...Switching device, 19...
Excitation power supply, 20... Output line, 21... Input line, 2
2... Ferrite core, 23... Iron core, 24...
Coil with core, 25...piezoelectric element, 26...excitation mechanism.

Claims (1)

[Scope of utility model registration request] By inputting drive signals and braking signals from a microcomputer to a switching device at predetermined timing and turning the switching device on and off, it is possible to create a core with a steep non-saturation region and a wide saturated region in the B-H curve. A piezoelectric actuator excitation drive device characterized in that an excitation voltage is applied to a piezoelectric actuator via a coil.