Circuit arrangement for charging and discharging a piezo actuator
The disclosure relates to a circuit arrangement that includes a first DC-DC converter that is connected on the output side to a capacitor. A first terminal of the capacitor is a supply voltage terminal and a second terminal of the capacitor is a reference potential terminal. The circuit arrangement also includes a second DC-DC converter, which is connected on the input side with the capacitor and on the output side to a first terminal of a piezo actuator. The second terminal of the piezo actuator is connected to the first terminal of the capacitor.
1. A circuit arrangement comprising:
a first DC-DC converter having an output side connected a capacitor, wherein a first terminal of the capacitor is a supply voltage terminal and a second terminal of the capacitor is a reference potential terminal; and
a second DC-DC converter having an input side and an output side, the input side connected to the capacitor and the output side connected to a first terminal of a piezo actuator,
wherein the second terminal of the piezo actuator is connected to the first terminal of the capacitor.
2. The circuit arrangement of claim 1 , wherein the first terminal of the piezo actuator (PA) is connected through a switching element to the reference potential terminal.
3. The circuit arrangement of claim 1 , wherein the second DC-DC converter is configured as a step-up converter.
4. The circuit arrangement of claim 1 , wherein the first DC-DC converter is configured as a step-up converter.
5. The circuit arrangement of claim 4 , wherein the first DC-DC converter is formed with a bridge circuit, the bridge circuit comprising:
a first bridge pillar formed with a series connection of a first transistor and a first diode;
a second bridge pillar formed with a series connection of a second diode and a second transistor; and
a coil arranged in the bridge of the first bridge pillar and the second bridge pillar.
6. The circuit arrangement of claim 1 , wherein the second DC-DC converter is formed with a series connection of a second coil and a third switching element connected between input terminals of the second DC-DC converter, whose connecting point is joined to an output terminal of the second DC-DC converter through a third diode connected in a forward biased direction.