Piezoelectric driving circuit

Details Piezoelectric driving circuit Piezoelectric driving circuit

1999-01-19

2001-03-20

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06204591

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a piezoelectric driving circuit, and more particularly to, a piezoelectric driving waveform generating circuit with low consumed power and low heat generation.
BACKGROUND OF THE INVENTION
FIG. 1
shows an example of a conventional piezoelectric driving waveform generating circuit. As shown in
FIG.1
, it is composed such that to piezoelectric driving waveform generated in a reference waveform generating circuit, a current amplifying circuit supplies as much current as necessary.
In this case, given that piezoelectric driving voltage (piezoelectric driving waveform output terminal voltage) is Vpzt (FIG.
2
(
a
)), collector current of transistor Tr
1
is i
1
(FIG.
2
(
b
) collector current of transistor Tr
2
is i
2
(FIG.
2
(
c
)), and high-potential side power source (high-voltage side power source) is Vh, energies P
1
, P
2
to be generated at transistors Tr
1
, Tr
2
, respectively are given by:
P1=(Vh−Vpzt)×i1
P2=Vpzt×i2
which are represented by FIGS.
2
(
d
), (
e
), respectively.
Since these energies generated are all heat generation from transistors, conventional devices cope with the situation by providing a high-rating transistor or heat sink. This prevents the devices from being miniaturized.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a piezoelectric driving circuit that the size of device can be miniaturized while achieving the low consumed power and low heat generation.
According to the invention, a piezoelectric driving circuit, comprises:
a first switching element and a first resistor, which are in series connected, being inserted between a high-potential side power source and a piezoelectric element; and
a second switching element and a second resistor, which are in series connected, being inserted between a low-potential side power source and the piezoelectric element;
wherein charging path is formed by turning on the first switching element and discharging path is formed by turning on the second switching element, so that a desired piezoelectric driving voltage waveform is produced.
According to another aspect of the invention, a piezoelectric driving circuit, comprises:
a plurality of circuits composed of a switching element and a resistor, which are in series connected, being in parallel inserted between a high-potential side power source and a piezoelectric element; and
a plurality of circuits composed of a switching element and a resistor, which are in series connected, being in parallel inserted between a low-potential side power source and the piezoelectric element.


REFERENCES:
patent: 4947074 (1990-08-01), Suzuki
patent: 5130598 (1992-07-01), Verheyen et al.
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patent: 2-145344 (1990-06-01), None
patent: 4-351200 (1992-12-01), None
patent: 5-330095 (1993-12-01), None
patent: 7-231247 (1995-08-01), None
patent: 7-274558 (1995-10-01), None

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