Two kinds of driving circuits of the separately excited piezoelectric loudspeaker and the piezoelectric vibration plate

The separately excited piezoelectric amplifier and piezoelectric vibrating plate are audible by applying an alternating voltage between the two terminals of the product. In the standard driver circuit example, there are two methods, (1) using transistor circuits and (2) direct driving through a microcomputer.

(1) Case of using a transistor circuit

Example of a driving circuit of a piezoelectric actuator and a piezoelectric diaphragm (excited excitation type) in the case of using a transistor circuit

The larger the voltage value applied to V, the larger the sound pressure of the piezoelectric sound element, and thus it is widely used in the case where the power source (voltage) can be ensured to be higher than the microcomputer driving voltage.

For the circuit components in the figure, add the following:

Rp in the figure is indispensable for releasing the charge stored in the piezoelectric sound element, so be sure to use it. Rs is used for volume adjustment, please use it when needed.

When the protection IC is protected from the breakdown voltage of the piezoelectric sound element, the transistor becomes a buffer, but for the protection of the transistor itself, if necessary, consider using the Zener diode in parallel with the piezoelectric sound element and Rp.

It is also possible to replace the transistor with an FET.

(2) Direct drive by microcomputer

Example of a driving circuit for a piezoelectric speaker and a piezoelectric vibrating plate (excited excitation type) in the case of direct driving by a microcomputer

The electro-acoustic component has a high impedance and is voltage-driven, so it can be driven directly by the IC.

For the circuit components in the figure, add the following:

In order to protect the IC from the breakdown voltage of the piezoelectric sound element, if necessary, consider using the Zener diode in parallel with the piezoelectric sound element.

Use a circuit design that avoids applying a DC voltage to the piezoelectric sound element for a long time.

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