Biasing circuit, driving circuit and electronic equipment

Abstract

The invention provides a biasing circuit, a driving circuit and electronic equipment, the biasing circuit comprises a first input end, a second input end, a first output end, a second output end and a first biasing module, the first biasing module comprises a first capacitor, a first diode and a first voltage-regulator tube, and the second input end is connected with the second output end; the first capacitor is connected between the first input end and the first output end, and the first diode and the first voltage-regulator tube are connected in series between the first output end and the second output end; the first bias module is used for increasing a first bias voltage on a first voltage signal between the first input end and the second input end to obtain a second voltage signal, and outputting the second voltage signal to the first output end and the second output end.

Description

Technical Field

[0001] This disclosure relates to the field of circuit technology, and more specifically, to a bias circuit, a drive circuit, and an electronic device. Background Technology

[0002] Piezoelectric pumps, a novel fluid power component based on the inverse piezoelectric effect of piezoelectric ceramics for fluid transport, have been widely used in aerospace, medical devices, electronic heat dissipation, precision manufacturing, and many other fields due to their significant advantages such as compact structure, fast response speed, absence of electromagnetic interference, and high transport accuracy. As the core driving component of piezoelectric pumps, the performance of the piezoelectric ceramic directly determines the pump's output characteristics, reliability, and service life. The design and application method of the driving voltage are key factors affecting the working state of the piezoelectric ceramic.

[0003] In existing piezoelectric pump drive technologies, to ensure sufficient deformation displacement of the piezoelectric ceramic to drive the pump in suction and discharge operations, a standard sine wave is commonly used as the drive voltage signal. The amplitude of this drive voltage is typically denoted as Vp, and the voltage variation range covers -Vp to Vp. However, the negative drive voltage (as low as -Vp) in this drive method can easily lead to disordered domain arrangement within the piezoelectric ceramic, thereby causing depolarization of the ceramic material. Summary of the Invention

[0004] One objective of this disclosure is to provide a new technical solution for bias circuits.

[0005] According to a first aspect of the present disclosure, a bias circuit is provided, including a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a first bias module. The first bias module includes a first capacitor, a first diode, and a first Zener diode. The second input terminal is connected to the second output terminal. The first capacitor is connected between the first input terminal and the first output terminal, and the first diode and the first Zener diode are connected in series between the first output terminal and the second output terminal; The first bias module is used to add a first bias voltage to the first voltage signal between the first input terminal and the second input terminal to obtain a second voltage signal, and output the second voltage signal to the first output terminal and the second output terminal.

[0006] Optionally, the anode of the first diode is connected to the second output terminal, the cathode of the first diode is connected to the first output terminal, the anode of the first Zener diode is connected to the first output terminal, and the cathode of the first Zener diode is connected to the second output terminal.

[0007] Optionally, the bias circuit further includes a third output terminal and a second bias module. The second bias module includes a second capacitor, a second diode, and a second Zener diode. The second capacitor is connected between the first input terminal and the third output terminal, and the second diode and the second Zener diode are connected in series between the second output terminal and the third output terminal. The second bias module is used to add a second bias voltage to the first voltage signal to obtain a third voltage signal, and output the third voltage signal to the second output terminal and the third output terminal.

[0008] Optionally, the anode of the second diode is connected to the third output terminal, the cathode of the second diode is connected to the second output terminal, the anode of the second Zener diode is connected to the second output terminal, and the cathode of the second Zener diode is connected to the third output terminal.

[0009] Optionally, the bias circuit further includes a third capacitor connected between the first output terminal and the second output terminal.

[0010] Optionally, the on-state voltage of the first Zener diode is determined based on the first bias voltage.

[0011] Optionally, the on-state voltage of the second Zener diode is determined based on the second bias voltage.

[0012] According to a second aspect of this disclosure, a driving circuit is provided, including a driving signal generation module and a bias circuit as described in the first aspect of this disclosure. The driving signal generation module is connected to the first input terminal and the second input terminal of the bias circuit. The driving signal generation module is used to generate a first voltage signal and transmit the first voltage signal to the first input terminal and the second input terminal.

[0013] According to a third aspect of this disclosure, an electronic device is provided, including a bias circuit and an actuator as described in a second aspect of this disclosure, wherein the actuator is connected to a first output terminal and a second output terminal of the bias circuit, and a second voltage signal is used to drive the actuator to operate.

[0014] Optionally, the actuator is a piezoelectric hydraulic pump.

[0015] The bias circuit of the embodiments of this disclosure can realize DC bias of the first voltage signal between the first input terminal and the second input terminal, effectively avoiding the problem of the positive voltage peak of the first voltage signal doubling in the existing bias voltage scheme, and reducing the power consumption of the system using the bias circuit.

[0016] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0018] Figure 1 This is a circuit diagram of a bias circuit according to the first embodiment of this disclosure; Figure 2 This is a circuit diagram of a bias circuit according to a second embodiment of the present disclosure; Figure 3 This is a block diagram of a driving circuit according to an embodiment of the present disclosure; Figure 4 This is a block diagram of a driving circuit according to an embodiment of the present disclosure. Detailed Implementation

[0019] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0020] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0021] Techniques, methods, and apparatus known to those skilled in the art in the relevant field may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0022] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0024] This disclosure provides a bias circuit, such as Figure 1 As shown, the bias circuit 1000 may include a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1, a second output terminal OUT2, and a first bias module 1100. The first bias module 1100 includes a first capacitor C1, a first diode D11, and a first Zener diode D12, and the second input terminal IN2 is connected to the second output terminal OUT2.

[0025] The first capacitor C1 is connected between the first input terminal IN1 and the first output terminal OUT1, and the first diode D11 and the first Zener diode D12 are connected in series between the first output terminal OUT1 and the second output terminal OUT2.

[0026] The first bias module 1100 is used to add a first bias voltage to the first voltage signal between the first input terminal IN1 and the second input terminal IN2 to obtain a second voltage signal, and output the second voltage signal to the first output terminal OUT1 and the second output terminal OUT2.

[0027] In this embodiment, the first diode D11 and the first Zener diode D12 can store the electrical energy output from the first input terminal IN1 in the first capacitor C1 to generate the second voltage signal.

[0028] Furthermore, the first capacitor C1 can also isolate the DC bias between the first input terminal IN1 and the first output terminal OUT1.

[0029] In this embodiment, one of the first input terminal IN1 and the second input terminal IN2 is a positive input terminal and the other is a negative input terminal; one of the first output terminal OUT1 and the second output terminal OUT2 is a positive output terminal and the other is a negative output terminal.

[0030] In an embodiment where the first input terminal IN1 is the positive input terminal and the second input terminal IN2 is the negative input terminal, the first output terminal OUT1 is the positive output terminal and the second output terminal OUT2 is the negative output terminal. The anode of the first diode D1 is connected to the second output terminal OUT2, the cathode of the first diode D11 is connected to the first output terminal OUT1, the anode of the first Zener diode D12 is connected to the first output terminal OUT1, and the cathode of the first Zener diode D12 is connected to the second output terminal OUT2.

[0031] In an embodiment where the first input terminal IN1 is the negative input terminal and the second input terminal IN2 is the negative input terminal, the first output terminal OUT1 is the negative output terminal and the second output terminal OUT2 is the positive output terminal. The anode of the first diode D1 is connected to the first output terminal OUT1, the cathode of the first diode D11 is connected to the second output terminal OUT2, the anode of the first Zener diode D12 is connected to the second output terminal OUT2, and the cathode of the first Zener diode D12 is connected to the first output terminal OUT1.

[0032] The second voltage signal in this embodiment can be used to drive any type of actuator, such as a motor or a piezoelectric pump.

[0033] In the embodiment where the second voltage signal is used to drive the piezoelectric pump, the high negative voltage peak of the first voltage signal may cause depolarization of the piezoelectric ceramic in the piezoelectric pump. The bias circuit in this embodiment reduces the reverse voltage peak of the pump's drive signal, minimizing or avoiding problems such as reduced reliability, excessive power consumption, reduced back pressure, and reduced flow rate caused by excessively high reverse voltage peaks.

[0034] The bias circuit of the embodiments of this disclosure can realize DC bias of the first voltage signal between the first input terminal and the second input terminal, effectively avoiding the problem of the positive voltage peak of the first voltage signal doubling in the existing bias voltage scheme, and reducing the power consumption of the system using the bias circuit.

[0035] In this embodiment, the forward voltage of the first Zener diode D11 can be determined based on the first bias voltage. Specifically, the forward voltage of the first Zener diode D11 is equal to the first bias voltage.

[0036] When the voltage variation range of the first voltage signal is -Vp to Vp and the conduction voltage of the first Zener diode D11 is Vd1, the voltage variation range of the second voltage signal can be -Vp+Vd1 to Vp+Vd1.

[0037] The first bias voltage in this embodiment can be determined according to the actual application scenario of the bias circuit.

[0038] Through this embodiment, the magnitude of the first bias voltage can be adjusted by selecting the first Zener diode with the corresponding turn-on voltage, making the bias circuit adaptable to a wider range of scenarios.

[0039] In some embodiments, such as Figure 2 As shown, the bias circuit 1000 also includes a third output terminal OUT3 and a second bias module 1200. The second bias module 1200 includes a second capacitor C2, a second diode D21, and a second Zener diode D22. The second capacitor C2 is connected between the first input terminal IN1 and the third output terminal OUT3. The second diode D21 and the second Zener diode D22 are connected in series between the second output terminal OUT2 and the third output terminal OUT3. The second bias module 1200 is used to add a second bias voltage to the first voltage signal to obtain a third voltage signal, and output the third voltage signal to the second output terminal OUT2 and the third output terminal OUT3.

[0040] In this embodiment, the second diode D21 and the second Zener diode D22 can store the electrical energy output from the second input terminal IN1 in the second capacitor C2 to generate the third voltage signal.

[0041] Furthermore, the second capacitor C2 can also isolate the DC bias between the first input terminal IN1 and the third output terminal OUT3.

[0042] In this embodiment, the first output terminal OUT1 and the third output terminal OUT3 are both positive output terminals, and the second output terminal OUT2 is a negative output terminal.

[0043] In this embodiment, the second bias voltage can be the same as or different from the first bias voltage, and no limitation is made here.

[0044] The third voltage signal in this embodiment can be used to drive any type of actuator, such as a motor or a piezoelectric pump.

[0045] In this embodiment, the third voltage signal and the second voltage signal can be different, specifically, they can be different in terms of voltage peak value and / or phase.

[0046] In the embodiment where the second voltage signal is used to drive the piezoelectric pump, the high negative voltage peak of the first voltage signal may cause depolarization of the piezoelectric ceramic in the piezoelectric pump. The bias circuit in this embodiment reduces the reverse voltage peak of the pump's drive signal, minimizing or avoiding problems such as reduced reliability, excessive power consumption, reduced back pressure, and reduced flow rate caused by excessively high reverse voltage peaks.

[0047] The bias circuit of this embodiment can be used to add a first bias voltage and a second bias voltage to the first voltage signal between the first input terminal and the second input terminal, respectively, to obtain a second voltage signal and a third voltage signal, so as to drive the two actuators.

[0048] In some embodiments, such as Figure 2 As shown, the anode of the second diode D21 is connected to the third output terminal OUT3, the cathode of the second diode D21 is connected to the second output terminal OUT2, the anode of the second Zener diode D22 is connected to the second output terminal OUT2, and the cathode of the second Zener diode D22 is connected to the third output terminal OUT3.

[0049] In this embodiment, the forward voltage of the second Zener diode D22 can be determined based on the second bias voltage. Specifically, the forward voltage of the second Zener diode D22 is equal to the second bias voltage.

[0050] When the voltage variation range of the first voltage signal is -Vp to Vp, and the conduction voltage of the second Zener diode D22 is Vd2, the voltage variation range of the second voltage signal can be -Vp+Vd2 to Vp+Vd2.

[0051] The second bias voltage in this embodiment can be determined according to the actual application scenario of the bias circuit.

[0052] Through this embodiment, the magnitude of the second bias voltage can be adjusted by selecting a second Zener diode with a corresponding turn-on voltage, making the bias circuit adaptable to a wider range of scenarios.

[0053] In some embodiments, such as Figure 2 As shown, the bias circuit 1000 also includes a third capacitor C3 and a fourth capacitor C4. The third capacitor is connected between the first output terminal OUT1 and the second output terminal OUT2, and the fourth capacitor C4 is connected between the second output terminal OUT2 and the third output terminal OUT3.

[0054] In this embodiment, the third capacitor C3 and the fourth capacitor C4 can be used to filter the second voltage signal and the third voltage signal, respectively.

[0055] In some embodiments, the first capacitor C1 and the second capacitor C2 may be ceramic capacitors.

[0056] This disclosure also provides a driving circuit, such as Figure 3 As shown, the driving circuit 3000 may include a driving signal generation module 3100 and any of the aforementioned bias circuits 1000. The driving signal generation module 3100 is connected to the first input terminal IN1 and the second input terminal IN2 of the bias circuit 1000. The driving signal generation module is used to generate a first voltage signal and transmit the first voltage signal to the first input terminal IN1 and the second input terminal IN2.

[0057] In some embodiments, the first voltage signal is a sine wave signal.

[0058] In this embodiment, the bias circuit adds a DC bias to the first voltage signal between the first input terminal and the second input terminal, avoiding the problem of the positive voltage peak of the first voltage signal doubling in the existing bias voltage scheme, which can improve the electromagnetic compatibility, insulation reliability and safety of the drive circuit.

[0059] This disclosure also provides an electronic device, such as Figure 4 The electronic device 4000 may include the drive circuit 3000 and the actuator 4100 of any of the foregoing embodiments. The actuator 4100 is connected to the first output terminal OUT1 and the second output terminal OUT2 in the bias circuit. The second voltage signal is used to drive the actuator to operate.

[0060] In some embodiments, the actuator includes a piezoelectric hydraulic pump.

[0061] In this embodiment, the bias circuit adds a DC bias to the first voltage signal between the first and second input terminals, avoiding the problem of the positive voltage peak of the first voltage signal doubling in existing bias voltage schemes. This reduces the risks of voltage breakdown and insulation aging caused by high voltage peaks, and also reduces electromagnetic interference intensity, avoiding the impact of high voltage peaks on surrounding electronic components, thus improving the overall operational stability of the electronic device. Furthermore, the low-voltage peak driving mode reduces safety hazards in electronic devices, simplifies safety protection design, and makes piezoelectric hydraulic pumps more widely applicable in fields with stringent safety requirements, such as medical devices and precision electronics.

[0062] Furthermore, the technical solution disclosed herein ensures that the piezoelectric ceramic of the piezoelectric pump always operates within a safe excitation range free of negative voltage, fundamentally eliminating domain disorder and depolarization caused by negative drive voltage, and ensuring the long-term stable performance of the inverse piezoelectric effect of the piezoelectric ceramic. It also reduces the risk of flow attenuation, pressure fluctuations, and failure caused by ceramic depolarization, significantly improving the reliability of the piezoelectric pump in long-term continuous operation scenarios and critical applications, and extending the overall service life of the piezoelectric pump.

[0063] This invention can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the invention.

[0064] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0065] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0066] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuits, such as programmable logic circuits, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), are personalized by utilizing state information from computer-readable program instructions. These electronic circuits can execute computer-readable program instructions to implement various aspects of the present invention.

[0067] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0068] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0069] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0070] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation using a combination of software and hardware are equivalent.

[0071] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A biasing circuit, characterized by, It includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a first bias module. The first bias module includes a first capacitor, a first diode, and a first Zener diode. The second input terminal is connected to the second output terminal. The first capacitor is connected between the first input terminal and the first output terminal, and the first diode and the first Zener diode are connected in series between the first output terminal and the second output terminal; The first bias module is used to add a first bias voltage to the first voltage signal between the first input terminal and the second input terminal to obtain a second voltage signal, and output the second voltage signal to the first output terminal and the second output terminal.

2. The biasing circuit of claim 1, wherein, The anode of the first diode is connected to the second output terminal, the cathode of the first diode is connected to the first output terminal, the anode of the first Zener diode is connected to the first output terminal, and the cathode of the first Zener diode is connected to the second output terminal.

3. The biasing circuit of claim 1, wherein, The bias circuit further includes a third output terminal and a second bias module. The second bias module includes a second capacitor, a second diode, and a second Zener diode. The second capacitor is connected between the first input terminal and the third output terminal, and the second diode and the second Zener diode are connected in series between the second output terminal and the third output terminal. The second bias module is used to add a second bias voltage to the first voltage signal to obtain a third voltage signal, and output the third voltage signal to the second output terminal and the third output terminal.

4. The biasing circuit of claim 3, wherein, The anode of the second diode is connected to the third output terminal, the cathode of the second diode is connected to the second output terminal, the anode of the second Zener diode is connected to the second output terminal, and the cathode of the second Zener diode is connected to the third output terminal.

5. The biasing circuit of claim 1, wherein, The bias circuit also includes a third capacitor connected between the first output terminal and the second output terminal.

6. The biasing circuit of claim 1, wherein, The on-state voltage of the first Zener diode is determined based on the first bias voltage.

7. The biasing circuit of claim 3, wherein, The on-state voltage of the second Zener diode is determined based on the second bias voltage.

8. A drive circuit, characterized by The device includes a drive signal generation module and a bias circuit as described in any one of claims 1 to 7. The drive signal generation module is connected to the first input terminal and the second input terminal of the bias circuit. The drive signal generation module is used to generate the first voltage signal and transmit the first voltage signal to the first input terminal and the second input terminal.

9. An electronic device, comprising: Includes the bias circuit and actuator as described in claim 8, wherein the actuator is connected to the first output terminal and the second output terminal of the bias circuit, and the second voltage signal is used to drive the actuator to operate.

10. The electronic device of claim 9, wherein, The actuator is a piezoelectric hydraulic pump.

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