Piezoelectric valve drive

Abstract

A piezoelectric valve driving device is disclosed. A first driver is connected to a first side of a valve. A second driver is connected to a second side of the valve. A power back charging circuit is coupled between an external power source and a second voltage. A charge and discharge current controller is connected to the first driver, the second driver, and the power back charging circuit. The charge and discharge current controller is configured to control currents of the first driver, the second driver, and the power back charging circuit. When a driving circuit drives the valve to switch from a closed state to an open state, the first driver provides a first voltage to the first side of the valve, and a second voltage outputted from the second driver to the second side of the valve discharges the power back charging circuit to output a discharge current through the power back charging circuit to the external power source.

Description

Technical Field

[0001] This invention relates to a drive device, and more particularly to a piezoelectric valve drive device. Background Technology

[0002] Microelectromechanical valves (MEMS) utilize the inverse piezoelectric effect of piezoelectric materials. When a voltage is applied, the electric dipole moment is stretched. To resist the change, the piezoelectric material elongates along the direction of the electric field, thus converting electrical energy into mechanical energy. This mechanism can be used to control the opening and closing of the MEMS valve. In wearable devices, it can be used as a pressure relief valve for the resonant cavity of a speaker. Opening the valve balances the pressure inside and outside the ear and allows external sound to enter, but the low-frequency sound pressure level drops, affecting sound performance. Closing the valve isolates external noise and increases the low-frequency sound pressure level. The control design must consider the impact of valve operation on sound to avoid abrupt noise. Furthermore, due to its application in wearable devices, a superior power-saving design is required. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a piezoelectric valve driving device, which addresses the shortcomings of the prior art, comprising a driving circuit, an electrical energy recharge circuit, and a charge / discharge current controller. The driving circuit includes a first driver and a second driver. The first driver is connected to a first side of the valve. The first driver is connected to an external power source. The first driver is configured to output a first voltage to the first side of the valve to drive the first side of the valve. The second driver is connected to a second side of the valve. The second driver is configured to output a second voltage to the second side of the valve to drive the second side of the valve. The electrical energy recharge circuit is coupled between the external power source and the second voltage. The charge / discharge current controller is connected to the first driver, the second driver, and the electrical energy recharge circuit. The charge / discharge current controller is configured to control the current of the first driver, the second driver, and the electrical energy recharge circuit. When the driving circuit drives the valve to switch from a closed state to an open state, the first driver provides the first voltage to the first side of the valve, and the second voltage output by the second driver to the second side of the valve discharges the electrical energy recharge circuit to output a discharge current to the electrical energy recharge circuit, which then provides the discharge current to the external power source.

[0004] In this embodiment, the first actuator is connected to an external power source. When the drive circuit drives the valve to switch from a closed state to an open state, the first actuator uses the voltage supplied by the external power source to provide a first voltage to the first side of the valve.

[0005] In an embodiment, when the drive circuit drives the valve to switch from a closed state to an open state and the voltage of the external power supply is lower than the second voltage, the power recharge circuit allows the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges to the external power supply.

[0006] In an embodiment, when the drive circuit drives the valve to switch from a closed state to an open state and the voltage of the external power supply is higher than the second voltage, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows to the reference potential.

[0007] In an embodiment, when the valve is in the closed state, the first voltage output by the first actuator to the first side of the valve is equal to the second voltage output by the second actuator to the second side of the valve.

[0008] In one embodiment, the first driver includes a voltage modulation circuit. The voltage modulation circuit is connected to a first side of the valve, a charge / discharge current controller, and an external power supply. When the drive circuit drives the valve to switch from a closed state to an open state, the voltage modulation circuit uses the voltage supplied by the external power supply to increase the first voltage output by the first driver to the first side of the valve. When the drive circuit drives the valve to switch from an open state to a closed state, the voltage modulation circuit decreases the first voltage output by the first driver to the first side of the valve.

[0009] In this embodiment, the energy recovery circuit includes a switching component. A first terminal of the switching component is coupled to a second voltage. A second terminal of the switching component is connected to an external power source. A control terminal of the switching component is connected to a charge / discharge current controller. When the drive circuit drives the valve to switch from a closed state to an open state, the discharge current generated when the second voltage output by the second actuator to the second side of the valve discharges flows to the external power source through the activated switching component.

[0010] In this embodiment, the energy recovery circuit further includes a diode. The diode is connected between the switching assembly and an external power source. The anode of the diode is connected to the second terminal of the switching assembly. The cathode of the diode is connected to the external power source. When the drive circuit drives the valve to switch from a closed state to an open state, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows sequentially through the opened switching assembly and the diode to the external power source.

[0011] In one embodiment, when the valve is in the open state, the first voltage applied to the first side of the valve by the first actuator is higher than the second voltage applied to the second side of the valve by the second actuator.

[0012] In one embodiment, the first voltage on the first side of the valve in the open state is higher than the first voltage on the first side of the valve in the closed state.

[0013] In one embodiment, the second voltage on the second side of the valve in the open state is lower than the second voltage on the second side of the valve in the closed state.

[0014] In an embodiment, when the valve is in the open state, the second voltage on the second side of the valve is equal to zero.

[0015] In this embodiment, the second driver is coupled to the first voltage. When the drive circuit drives the valve to switch from an open state to a closed state, the first voltage output by the first driver to the first side of the valve is discharged to output another discharge current to the second driver, and the second driver uses the other discharge current to provide a second voltage to the second side of the valve.

[0016] In this embodiment, the second driver includes a first drive switch and a second drive switch. A first terminal of the first drive switch is coupled to a first voltage. A first terminal of the second drive switch is connected to a second terminal of the first drive switch. A control terminal of the first drive switch is connected to a charge / discharge current controller. The node between the first terminal and the second terminal of the second drive switch is connected to a second side of the valve. The second terminal of the second drive switch is coupled to a reference potential. The control terminal of the second drive switch is connected to the charge / discharge current controller. When the drive circuit drives the valve to switch from a closed state to an open state, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows through the open second drive switch to the reference potential, or it does not flow through the closed second drive switch but instead flows through the energy return circuit to an external power source.

[0017] In an embodiment, when the drive circuit drives the valve to switch from an open state to a closed state, the other discharge current generated when the first voltage output by the first driver to the first side of the valve discharges flows through the opened first drive switch to the second side of the valve.

[0018] In an embodiment, when the valve remains closed, the first drive switch in the second driver remains on, making the first voltage equal to the second voltage, and the voltage modulation circuit included in the first driver controls both the first voltage and the second voltage to a center voltage.

[0019] In this embodiment, the charge / discharge current controller controls the current magnitude of the first driver, the second driver, and the energy recharge circuit to control the rise and fall rates of the first and second voltages, thereby controlling the operating speed of the valve.

[0020] As described above, the present invention provides a piezoelectric valve actuation device that, when a valve is switched from a closed state to an open state, discharges a second voltage output from a second actuator to a second side of the valve into an energy recovery circuit to output a discharge current to the energy recovery circuit, instead of discharging it entirely to zero potential. In particular, the energy recovery circuit can appropriately provide this discharge current to an external power source to charge the external power source, thereby saving power consumption. Furthermore, the piezoelectric valve actuation device of the present invention can appropriately control the rise and fall rates of the first voltage output from the first actuator to the first side of the valve and the second voltage output from the second actuator to the second side of the valve to prevent high noise during valve operation.

[0021] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0022] Figure 1 This is a block diagram of a piezoelectric valve drive device according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the valve of a loudspeaker driven by a piezoelectric valve driving device according to an embodiment of the present invention in the closed state.

[0024] Figure 3 This is a schematic diagram of the valve of a loudspeaker driven by a piezoelectric valve driving device according to an embodiment of the present invention in the open state.

[0025] Figure 4 This is a schematic diagram of the voltage of the valve of a loudspeaker driven by the piezoelectric valve driving device in the closed state according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the voltage of the valve of a loudspeaker driven by the piezoelectric valve driving device in the open state according to an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram illustrating the voltage change of a valve when the piezoelectric valve driving device drives the valve to switch between a closed state and an open state, according to an embodiment of the present invention.

[0028] Figure 7 This is a block diagram of the first driver and the charge / discharge current controller of the piezoelectric valve driving device according to an embodiment of the present invention.

[0029] Figure 8 The circuit diagram shows the second driver and the charge / discharge current controller of the piezoelectric valve driving device according to an embodiment of the present invention.

[0030] Figure 9 This is a circuit diagram of the power recovery circuit and the charge / discharge current controller of the piezoelectric valve drive device according to an embodiment of the present invention. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention. In addition, the term "or" as used herein may, depending on the actual situation, include any combination of any one or more of the associated listed items.

[0032] Please see Figures 1 to 3 ,in Figure 1 This is a block diagram of a piezoelectric valve actuation device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the valve of a loudspeaker driven by a piezoelectric valve driving device according to an embodiment of the present invention in the closed state. Figure 3 This is a schematic diagram of the valve of a loudspeaker driven by a piezoelectric valve driving device according to an embodiment of the present invention in the open state.

[0033] like Figure 1 As shown, the piezoelectric valve actuation device of this embodiment may include a drive circuit, an energy recovery circuit 30, and a charge / discharge current controller 40, wherein the drive circuit may include a first driver 10 and a second driver 20. The piezoelectric valve actuation device of this embodiment can be applied to drive valves of an electronic device, for example, for driving... Figure 2 and Figure 3 The valve 91 of the speaker 90 of the Bluetooth headset shown is merely an example and is not intended to limit the invention.

[0034] The first terminal of the first driver 10 can be connected to an external power source, i.e., coupled to the voltage of the external power source, such as, but not limited to, a battery. Figure 1 The power supply voltage shown is VBAT. The second end of the first actuator 10 is connected to the first side of the valve 91.

[0035] The first end of the second actuator 20 can be coupled to the first voltage VO1, or the first end of the second actuator 20 can be connected to the second end of the first actuator 10 (or the first side of the valve 91). The second end of the second actuator 20 can be connected to the second side of the valve 91.

[0036] The third terminal of the second driver 20 can be coupled to a reference potential GND, such as zero potential, and the second terminal of the second driver 20 or the second side of the valve 91 can be coupled to a reference potential GND, such as zero potential, through the third terminal of the second driver 20.

[0037] The energy recovery circuit 30 is coupled between the second voltage VO2 and an external power source. The first terminal of the energy recovery circuit 30 is coupled to the second voltage VO2. The second terminal of the energy recovery circuit 30 is connected to the external power source, specifically, a power supply voltage VBAT of a battery, but not limited to that of the external power source.

[0038] The charge / discharge current controller 40 can be connected to the first driver 10, the second driver 20, and the energy recharge circuit 30. The charge / discharge current controller 40 can control the current of the first driver 10, the second driver 20, and the energy recharge circuit 30, including the discharge current and the charging current described below.

[0039] The first driver 10 is configured to output a first voltage VO1 to a first side of the valve 91 to drive the first side of the valve 91. The second driver 20 is configured to output a second voltage VO2 to a second side of the valve 91 to drive the second side of the valve 91.

[0040] It is worth noting that when the drive circuit drives valve 91 from such Figure 2 The closed state shown is switched to as follows Figure 3 In the open state shown, the first actuator 10 can (using the power supply voltage VBAT supplied by an external power source) pull up the first voltage VO1 supplied to the first side of the valve 91. At the same time, the second voltage VO2 output from the second terminal of the second actuator 20 to the second side of the valve 91 can discharge the power recovery circuit 30 to output a discharge current to the power recovery circuit 30. The power recovery circuit 30 can provide this discharge current to an external power source to charge the external power source, thereby increasing the power supply voltage VBAT of the external power source, such as a battery.

[0041] If necessary, the power recovery circuit 30 can determine whether to supply the discharge current generated when the second voltage VO2 output by the second driver 20 to the second side of the valve 91 is discharged to the external power source based on the voltage value of the power supply voltage VBAT of an external power source, such as a battery.

[0042] For example, when electrical energy is returned to the charging circuit 30, the drive circuit determines that the valve 91 is driven from the point of origin. Figure 2 The closed state shown is switched to as follows Figure 3 When the external power supply is in the open state and the voltage of the external power supply is lower than the second voltage VO2, the power recharge circuit 30 allows the second terminal of the second driver 20 to output a discharge current generated when the second voltage VO2 on the second side of the valve 91 is discharged to the external power supply.

[0043] When the drive circuit drives valve 91 from such Figure 2 The closed state shown is switched to as follows Figure 3When the external power supply voltage is higher than the second voltage VO2, the power recharge circuit 30 does not allow the discharge current generated when the second voltage VO2 output from the second terminal of the second driver 20 to the second side of the valve 91 discharges to the external power supply. This discharge current (through the second driver 20) flows directly to a reference potential GND, such as zero potential, to discharge the second voltage VO2. As a result, the second voltage VO2 output from the second terminal of the second driver 20 to the second side of the valve 91 gradually decreases.

[0044] Conversely, when the drive circuit drives valve 91 from such Figure 3 The open state shown has been switched to the state shown. Figure 2 In the closed state shown, the first actuator 10 discharges a first voltage VO1 output to the first side of the valve 91 to output another discharge current to the second actuator 20. Then, the second actuator 20 can use this other discharge current generated during the discharge of the first voltage VO1 output by the first actuator 10 to the first side of the valve 91. The second actuator 20 can use this other discharge current to provide a second voltage VO2 to the second side of the valve 91.

[0045] Please see Figures 1 to 6 ,in Figure 4 This is a schematic diagram showing the voltage of the valve of a loudspeaker driven by the piezoelectric valve driving device in the closed state according to an embodiment of the present invention. Figure 5 This is a schematic diagram showing the voltage of the valve of a loudspeaker driven by the piezoelectric valve driving device in the open state, according to an embodiment of the present invention. Figure 6 This is a schematic diagram illustrating the voltage change of a valve when the piezoelectric valve driving device drives the valve to switch between a closed state and an open state, according to an embodiment of the present invention.

[0046] When the first voltage VO1 applied by the first actuator 10 to the first side of the valve 91 is the same as the second voltage VO2 applied by the second actuator 20 to the second side of the valve 91, for example, both are equal to... Figure 4 and Figure 6 When the center voltage VC is as shown, valve 91 is in the closed state.

[0047] like Figures 4 to 6 As shown, when the first voltage VO1 applied by the first actuator 10 to the first side of the valve 91 gradually increases from the center voltage VC to a default high drive voltage VH, and at the same time the second voltage VO2 applied by the second actuator 20 to the second side of the valve 91 gradually decreases from the center voltage VC to a reference potential GND, such as zero potential, the valve 91 switches from the closed state to the open state.

[0048] When valve 91 is in the open state, the first voltage VO1 applied by the first actuator 10 to the first side of valve 91 is higher than the second voltage VO2 applied by the second actuator 20 to the second side of valve 91.

[0049] It is worth noting that, such as Figure 6 As shown, when valve 91 switches from the closed state to the open state, the second voltage VO2 applied by the second actuator 20 to the second side of valve 91 first discharges to the external power supply until it is less than the power supply voltage VBAT of the external power supply, and then switches to discharging to a reference potential GND, such as zero potential, such as ground.

[0050] like Figure 4 and Figure 6 As shown, when the first voltage VO1 applied by the first actuator 10 to the first side of the valve 91 gradually decreases from a default high driving voltage VH to the center voltage VC, and at the same time the second voltage VO2 applied by the second actuator 20 to the second side of the valve 91 gradually increases from the reference potential GND, for example, zero potential, to the center voltage VC, the valve 91 switches from the open state to the closed state.

[0051] like Figure 6 As shown, the first voltage VO1 on the first side of valve 91 in the open state is a default high drive voltage VH, which is greater than the first voltage VO1 on the first side of valve 91 in the closed state, for example, the center voltage VC. The second voltage VO2 on the second side of valve 91 in the open state is, for example, zero potential, which is less than the second voltage VO2 on the second side of valve 91 in the closed state, for example, the center voltage VC.

[0052] For example, half of the sum of the first voltage VO1 on the first side of the valve 91 in the open state and the second voltage VO2 on the second side of the valve 91 in the open state, for example, is the center voltage VC, which is equal to the first voltage VO1 on the first side of the valve 91 in the closed state and also equal to the second voltage VO2 on the second side of the valve 91 in the closed state. This is only an example and the present invention is not limited thereto.

[0053] Please see Figure 1 and Figure 7 ,in Figure 7 This is a block diagram of the first driver and the charge / discharge current controller of the piezoelectric valve driving device according to an embodiment of the present invention.

[0054] For example, such as Figure 1 The first driver 10 shown may include, for example: Figure 7 The voltage modulation circuit 11 shown is merely an example and is not intended to limit the invention.

[0055] like Figure 7The first terminal of the voltage modulation circuit 11 shown can be connected to an external power source, i.e., coupled to an external power source, such as... Figure 1 and Figure 7 The external power source shown is, for example, a battery with a power supply voltage VBAT. Figure 7 The second terminal of the voltage modulation circuit 11 shown can be connected to a valve (e.g., but not limited to) Figure 2 The first side of the valve 91 of the speaker 90. The third terminal of the voltage modulation circuit 11 can be connected to the charge / discharge current controller 40. If needed, such as Figure 7 As shown, the fourth terminal of the voltage modulation circuit 11 can be coupled to a reference potential GND, such as zero potential.

[0056] When the drive circuit drives the valve to switch from a closed state to an open state, the voltage modulation circuit 11 can (using the voltage supplied by an external power source) increase the first voltage VO1 output by the first driver 10 to the first side of the valve, for example... Figure 4 and Figure 5 The first voltage VO1 is raised from the center voltage VC to a default high drive voltage VH. The voltage modulation circuit 11 can also control the slope of the rise of the first voltage VO1.

[0057] Conversely, when the drive circuit drives the valve to switch from the open state to the closed state, the voltage modulation circuit 11 can reduce the first voltage VO1 output from the second terminal of the first driver 10 to the first side of the valve, for example... Figures 4 to 6 The voltage modulation circuit 11 is shown to reduce the first voltage VO1 from a default high drive voltage VH to a center voltage VC. The voltage modulation circuit 11 can also control the slope of the first voltage VO1's descent. For example, the voltage modulation circuit 11 can adjust the first voltage VO1 at the second terminal of the first driver 10 to... Figure 1 The second driver 20 shown (and / or the pair shown) Figure 7 The reference potential GND (e.g., zero potential) is discharged to reduce the first voltage VO1 output from the second terminal of the first driver 10 to the first side of the valve.

[0058] Please see Figure 1 and Figure 8 ,in Figure 8 The circuit diagram shows the second driver and the charge / discharge current controller of the piezoelectric valve driving device according to an embodiment of the present invention.

[0059] For example, such as Figure 1 The second driver 20 shown may include, for example: Figure 8 The first drive switch T21 and the second drive switch T22 shown are, for example, transistors. This is only an example and is not intended to limit the invention.

[0060] like Figure 8 The first terminal of the first drive switch T21 shown is coupled as follows: Figure 1 and Figure 8 The first voltage VO1 is shown. The second terminal of the first drive switch T21 is connected to the first terminal of the second drive switch T22.

[0061] like Figure 8 The node connecting the first end of the second drive switch T22 and the second end of the first drive switch T21 shown is a valve (e.g., but not limited to) Figure 2 The second side of the valve 91 of the speaker 90. For example... Figure 8 The second terminal of the second drive switch T22 shown is coupled as follows: Figure 1 and Figure 8 The reference potential GND shown is, for example, zero potential.

[0062] If necessary, the control terminals of the first drive switch T21 and the second drive switch T22 can be connected to the charge / discharge current controller 40. The charge / discharge current controller 40 can be used to control the operation of the first drive switch T21 and the second drive switch T22, such as turning them on and off, and controlling the magnitude of the current flowing through them.

[0063] When the drive circuit drives the valve to switch from the closed state to the open state, and the voltage of the external power supply is charged to a level higher than the second voltage VO2, the discharge current generated when the second voltage VO2 on the second side of the valve is discharged from the second terminal of the second driver 20 flows through the opened second drive switch T22 to the reference potential GND, for example, zero potential.

[0064] It is worth noting that when the drive circuit drives the valve to switch from the closed state to the open state, and the voltage of the external power supply is lower than the second voltage VO2, the discharge current generated when the second voltage VO2 output from the second terminal of the second driver 20 to the second side of the valve discharges does not flow through the closed second drive switch T22, but flows through the power return circuit 30 to the external power supply to charge the external power supply, thereby increasing the power supply voltage VBAT of the external power supply, such as a battery.

[0065] Conversely, when the drive circuit drives the valve to switch from the open state to the closed state, the first voltage VO1 output by the first driver 10 to the first side of the valve is discharged to output another discharge current, which flows through the opened first drive switch T21 to the second side of the valve.

[0066] Please see Figure 1 and Figure 9 ,in Figure 9 The circuit diagram shows the power recovery circuit and the charge / discharge current controller of the piezoelectric valve drive device according to an embodiment of the present invention.

[0067] For example, such as Figure 1 The energy recovery circuit 30 shown may include, for example: Figure 9The switch assembly T3, diode Dd, or both shown are merely examples and are not intended to limit the invention.

[0068] like Figure 9 The first terminal of the switch assembly T3 shown can be coupled to, as Figure 1 and Figure 9 The second voltage VO2 is shown. The control terminal of the switching assembly T3 can be connected to the charge / discharge current controller 40, which can control the operation of the switching assembly T3, such as turning it on or off, and controlling the magnitude of the current passing through it.

[0069] Diode Dd can be connected between switching assembly T3 and an external power source. The anode of diode Dd can be connected to the second terminal of switching assembly T3. The cathode of diode Dd can be connected to an external power source, specifically a power supply voltage VBAT, such as that of a battery.

[0070] When the drive circuit drives the valve to switch from the closed state to the open state (and the voltage of the external power supply is lower than the second voltage VO2), the discharge current generated when the second voltage VO2 output from the second terminal of the second driver 20 to the second side of the valve discharges flows sequentially through the turned-on switch component T3 and the diode Dd to the external power supply, thereby increasing the power supply voltage VBAT of the external power supply, such as a battery.

[0071] In summary, the present invention provides a piezoelectric valve actuation device that, when a valve is switched from a closed state to an open state, discharges the second voltage output by the second actuator to the second side of the valve into an energy recovery circuit to output a discharge current to the energy recovery circuit, instead of discharging it entirely to zero potential. In particular, the energy recovery circuit can appropriately provide this discharge current to an external power source to charge the external power source, thereby saving power consumption. Furthermore, the piezoelectric valve actuation device of the present invention can appropriately control the rise and fall rates of the first voltage output by the first actuator to the first side of the valve and the second voltage output by the second actuator to the second side of the valve to prevent high noise during valve operation.

[0072] The above-disclosed content is only a preferred embodiment of the present invention and is not intended to limit the claims of the present invention. Therefore, all equivalent technical changes made based on the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. A piezoelectric valve actuation device, characterized in that, The piezoelectric valve actuation device includes: The driving circuit includes: A first actuator is connected to a first side of a valve, the first actuator being configured to output a first voltage to the first side of the valve to drive the first side of the valve; as well as A second actuator is connected to a second side of the valve and configured to output a second voltage to the second side of the valve to drive the second side of the valve. as well as The electrical energy recovery circuit is coupled between the external power source and the second voltage. A charge / discharge current controller is connected to the first driver, the second driver, and the energy recharge circuit, and is configured to control the current of the first driver, the second driver, and the energy recharge circuit; When the drive circuit drives the valve to switch from a closed state to an open state, the first driver provides the first voltage to the first side of the valve, and the second driver outputs the second voltage to the second side of the valve to discharge the power recharge circuit to output a discharge current to the power recharge circuit. The power recharge circuit provides the discharge current to the external power source.

2. The piezoelectric valve actuation device according to claim 1, characterized in that, The first driver is connected to the external power supply. When the drive circuit drives the valve to switch from the closed state to the open state, the first driver uses the voltage supplied by the external power supply to provide the first voltage to the first side of the valve.

3. The piezoelectric valve actuation device according to claim 1, characterized in that, When the drive circuit drives the valve to switch from a closed state to an open state and the voltage of the external power supply is lower than the second voltage, the power recharge circuit allows the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges to the external power supply.

4. The piezoelectric valve actuation device according to claim 3, characterized in that, When the drive circuit drives the valve to switch from the closed state to the open state and the voltage of the external power supply is higher than the second voltage, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows to the reference potential.

5. The piezoelectric valve actuation device according to claim 1, characterized in that, When the valve is in the closed state, the first voltage output by the first actuator to the first side of the valve is equal to the second voltage output by the second actuator to the second side of the valve.

6. The piezoelectric valve actuation device according to claim 1, characterized in that, The first driver includes a voltage modulation circuit connected to the first side of the valve, the charge / discharge current controller, and the external power supply. When the driving circuit drives the valve to switch from the closed state to the open state, the voltage modulation circuit uses the voltage supplied by the external power supply to increase the first voltage output by the first driver to the first side of the valve. When the drive circuit drives the valve to switch from the open state to the closed state, the voltage modulation circuit reduces the first voltage output by the first driver to the first side of the valve.

7. The piezoelectric valve actuation device according to claim 1, characterized in that, The energy recovery circuit includes a switching assembly, a first terminal of which is coupled to the second voltage, a second terminal of which is connected to the external power supply, and a control terminal of which is connected to the charge / discharge current controller. When the drive circuit drives the valve to switch from the closed state to the open state, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows to the external power source through the activated switch assembly.

8. The piezoelectric valve actuation device according to claim 7, characterized in that, The energy recovery circuit also includes a diode connected between the switching assembly and the external power source, with the anode of the diode connected to the second terminal of the switching assembly and the cathode of the diode connected to the external power source. When the drive circuit drives the valve to switch from the closed state to the open state, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows sequentially through the activated switch assembly and the diode to the external power supply.

9. The piezoelectric valve actuation device according to claim 1, characterized in that, When the valve is in the open state, the first voltage applied by the first actuator to the first side of the valve is higher than the second voltage applied by the second actuator to the second side of the valve.

10. The piezoelectric valve actuation device according to claim 1, characterized in that, The first voltage on the first side of the valve in the open state is higher than the first voltage on the first side of the valve in the closed state.

11. The piezoelectric valve actuation device according to claim 1, characterized in that, The second voltage on the second side of the valve in the open state is lower than the second voltage on the second side of the valve in the closed state.

12. The piezoelectric valve actuation device according to claim 1, characterized in that, When the valve is in the open state, the second voltage on the second side of the valve is equal to zero.

13. The piezoelectric valve actuation device according to claim 1, characterized in that, The second driver is coupled to the first voltage. When the driving circuit drives the valve to switch from the open state to the closed state, the first driver outputs the first voltage to the first side of the valve to discharge and output another discharge current to the second driver. The second driver uses the other discharge current to provide the second voltage to the second side of the valve.

14. The piezoelectric valve actuation device according to claim 1, characterized in that, The second driver includes: A first drive switch, the first terminal of the first drive switch is coupled to the first voltage, and the control terminal of the first drive switch is connected to the charge / discharge current controller; as well as A second drive switch, the first end of the second drive switch is connected to the second end of the first drive switch, the node between the first end of the second drive switch and the second end of the first drive switch is connected to the second side of the valve, the second end of the second drive switch is coupled to a reference potential, and the control end of the second drive switch is connected to the charge and discharge current controller. When the drive circuit drives the valve to switch from the closed state to the open state, the discharge current generated when the second voltage output by the second driver to the second side of the valve discharges flows through the open second drive switch to the reference potential, or flows through the power recharge circuit to the external power source instead of through the closed second drive switch.

15. The piezoelectric valve actuation device according to claim 14, characterized in that, When the drive circuit drives the valve to switch from the open state to the closed state, another discharge current generated when the first voltage output by the first driver to the first side of the valve discharges flows through the opened first drive switch to the second side of the valve.

16. The piezoelectric valve actuation device according to claim 15, characterized in that, When the valve remains closed, the first drive switch in the second driver remains on, making the first voltage equal to the second voltage, and the voltage modulation circuit included in the first driver controls both the first voltage and the second voltage to a center voltage.

17. The piezoelectric valve actuation device according to claim 1, characterized in that, The charge / discharge current controller controls the current magnitude of the first driver, the second driver, and the energy recovery circuit to control the rise and fall rates of the first voltage and the second voltage, thereby controlling the operating speed of the valve.

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