CN217642851U - Piezoelectric ceramic air pump suitable for outdoor portability - Google Patents
Piezoelectric ceramic air pump suitable for outdoor portability Download PDFInfo
- Publication number
- CN217642851U CN217642851U CN202220995062.0U CN202220995062U CN217642851U CN 217642851 U CN217642851 U CN 217642851U CN 202220995062 U CN202220995062 U CN 202220995062U CN 217642851 U CN217642851 U CN 217642851U
- Authority
- CN
- China
- Prior art keywords
- power supply
- air pump
- piezoelectric ceramic
- control circuit
- electrically connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Reciprocating Pumps (AREA)
Abstract
The piezoelectric ceramic air pump suitable for being carried outdoors comprises a DC-AC inverter and a piezoelectric ceramic air pump main body; the output end of the DC-AC inverter is electrically connected with the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and provides alternating current for the piezoelectric ceramic piece, and the alternating current drives the piezoelectric ceramic piece to vibrate. The DC-AC inverter comprises an MCU control circuit, an inverter bridge circuit and a step-up transformer; the MCU control circuit is electrically connected with the input end of the inverter bridge circuit, and the output end of the inverter bridge circuit is electrically connected with the input end of the step-up transformer; the MCU control circuit outputs a pair of PWM pulse control signals with opposite polarities to the inverter bridge circuit; the pair of PWM pulse control signals with opposite polarities is used for controlling the frequency and the amplitude of the alternating current output by the inverter bridge circuit. The built-in DC-AC inverter makes the piezoelectric ceramic air pump suitable for DC power supply, expands the application scene of the piezoelectric ceramic air pump, and is not limited to AC power supply.
Description
Technical Field
The application relates to a piezoceramics air pump suitable for in outdoor portable application scene especially relates to outdoor portable piezoceramics air pump suitable for DC power supply.
Background
In outdoor or portable application scenes without alternating current power supply, air pumps which are used for outdoor operations (such as fishing enthusiasts) and driven by the power supply of a battery can be roughly divided into several types, wherein one type is an electromagnetic vibration type air pump which repeatedly compresses a leather cup by utilizing an electromagnetic principle; the second is a DC motor air pump which utilizes a small DC motor to drive an eccentric wheel to compress a leather cup. The electromagnetic vibration type air pump is high in energy consumption, the service life of the rubber cup is short, and the hardness of the rubber cup changes correspondingly along with the change of the ambient temperature, so that the performance of the air pump is affected unstably. In addition, the device has large appearance, inconvenient carrying, low efficiency and short relative working time when the battery supplies power. The direct current motor air pump can be driven by direct current such as a battery due to the use of a small direct current motor, but the motor rotating at a high speed is usually very noisy and short in service life, the performance of a rubber cup of the air pump can change along with the change of the environmental temperature, so that the performance of the air pump is unstable, and the relative working time of the battery power supply is short. The conventional general direct-current storage battery can support the two air pumps for about 3-4 hours, and the battery with large capacity can support the air pumps for a little 5-6 hours. These disadvantages are also unfortunate for outdoor operators.
Piezoelectric pumps are a new type of fluid driver. The piezoelectric pump does not need an additional driving motor, but utilizes the inverse piezoelectric effect of piezoelectric ceramics to deform the piezoelectric vibrator, and then the volume change of a pump cavity is generated by the deformation to realize fluid output or the piezoelectric vibrator is utilized to generate fluctuation to transmit fluid, and the piezoelectric pump has the characteristics which are not possessed by the traditional pump. The piezoelectric ceramic air pump can directly convert alternating current energy into kinetic energy without rotating through an electromagnetic field conversion driving part, and the energy conversion efficiency is naturally higher than that of an electromagnetic vibration type air pump and a direct current motor air pump.
A piezoelectric ceramic air pump is described in patent document CN201620097997 entitled piezoelectric ceramic air pump. The piezoelectric pump consists of a piezoelectric vibrator, a pump valve and a pump body. In work, when an alternating current power supply U is applied to two ends of the piezoelectric vibrator, the piezoelectric vibrator is radially compressed under the action of an electric field, and tensile stress is generated inside the piezoelectric vibrator, so that the piezoelectric vibrator is bent and deformed. When the piezoelectric vibrator is bent in the positive direction, the piezoelectric vibrator extends, the volume of a pump cavity is increased, the pressure of fluid in the cavity is reduced, a pump valve is opened, and the fluid enters the pump cavity; when the piezoelectric vibrator is bent reversely, the piezoelectric vibrator contracts, the volume of a pump cavity is reduced, the pressure of fluid in the cavity is increased, a pump valve is closed, and the fluid in the pump cavity is extruded and discharged to form smooth continuous directional flow. The piezoelectric ceramic air pump is usually used for a miniature air pump, is made of piezoelectric ceramic materials, has high electromechanical conversion rate, has the advantages of strong heat dissipation stability, high strength, good toughness and strong oxidation resistance, and has the characteristics of simple structure, high response speed, small volume, no noise and the like. However, the piezoelectric ceramic plate needs to be driven by alternating current to move, so that the application of the piezoelectric ceramic pump in outdoor scenes is limited. The piezoelectric pump in this application is a piezoelectric ceramic pump.
Disclosure of Invention
The technical problem that this application will solve lies in avoiding among the above-mentioned prior art can't provide the weak point that is applicable to outdoor portable application scene's low-power consumption, duration are strong air pump, and provides a piezoceramics air pump that can be applicable to outdoor portable, can directly utilize DC power supply, and the low noise of consumption is low, and energy conversion efficiency is high, is applicable to multiple application scenes especially outdoor portable scene.
The technical scheme for solving the technical problems in the application is that the piezoelectric ceramic air pump suitable for being carried outdoors comprises a DC-AC inverter and a piezoelectric ceramic air pump main body; the DC-AC inverter is used for converting direct current provided by an external direct current power supply into alternating current; the input end of the DC-AC inverter is electrically connected with an external direct current power supply to obtain direct current input; the output end of the DC-AC inverter is electrically connected with the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and provides alternating current for the piezoelectric ceramic piece, and the alternating current drives the piezoelectric ceramic piece to vibrate.
The DC-AC inverter comprises an MCU control circuit, an inverter bridge circuit and a booster transformer; the MCU control circuit is electrically connected with the input end of the inverter bridge circuit, and the output end of the inverter bridge circuit is electrically connected with the input end of the step-up transformer; the MCU control circuit outputs a pair of PWM pulse control signals with opposite polarities to the inverter bridge circuit; the pair of PWM pulse control signals with opposite polarities is used for controlling the frequency and the amplitude of the alternating current output by the inverter bridge circuit.
The MCU control circuit is also provided with a frequency adjusting interface; the frequency adjusting interface is used for receiving an external frequency adjusting instruction, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the received frequency adjusting instruction; or the MCU control circuit is also provided with a frequency adjusting switch, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the state of the frequency adjusting switch; the frequency of the PWM pulse control signal determines the frequency of the voltage signal output by the inverter bridge circuit.
The MCU control circuit is also provided with a voltage regulation interface; the voltage regulation interface is used for receiving an external voltage regulation instruction, and the MCU control circuit regulates the duty ratio of a PWM pulse control signal output by the MCU control circuit according to the received voltage regulation instruction; or the MCU control circuit is also provided with a duty ratio adjuster, and the MCU control circuit adjusts the duty ratio of the PWM pulse control signal output by the MCU control circuit according to the state of the duty ratio adjuster; the duty ratio of the PWM pulse control signal determines the voltage output by the inverter bridge circuit.
The portable piezoelectric ceramic air pump suitable for outdoor use further comprises a power supply change-over switch; the power supply change-over switch is used for controlling the connection relation between the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and an external power supply; in the first state of the power supply changeover switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with the output end of the DC-AC inverter, and the piezoelectric ceramic air pump can obtain power supply through a direct current power supply connected with the DC-AC inverter; and in the second state of the power supply change-over switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected and disconnected with the output end of the DC-AC inverter, and the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with an external alternating current power supply, so that the piezoelectric ceramic air pump can supply power through the external alternating current power supply.
The outdoor portable piezoelectric ceramic air pump also comprises a low-voltage direct-current power supply; the output end of the low-voltage direct-current power supply is electrically connected with the input end of the DC-AC inverter.
The low-voltage direct-current power supply is a power supply with the safety voltage lower than 36V and comprises any one of a dry battery, a lithium battery, a lead-acid battery or a battery pack.
The low-voltage direct-current power supply is a power supply device capable of providing a safe voltage lower than 36V, and comprises any one of a vehicle-mounted charging power supply, a USB power supply or an AC-DC adapter.
The outdoor portable piezoelectric ceramic air pump also comprises an AC-DC switching power supply and a charging management circuit; the AC-DC switching power supply is used for obtaining electric energy from an external alternating current power supply; the AC-DC switching power supply is electrically connected with the MCU control circuit and supplies power to the MCU control circuit; the AC-DC switching power supply is electrically connected with the charging management circuit, and the charging management circuit is electrically connected with the low-voltage direct-current power supply; the low-voltage direct-current power supply is electrically connected with the overcharge management circuit to obtain electric energy from an external alternating-current power supply for charging.
The outdoor portable piezoelectric ceramic air pump further comprises an AC detection circuit and a power supply switching circuit; one end of the AC detection circuit is electrically connected with the AC-DC switching power supply; the other end of the AC detection circuit is electrically connected with the MCU control circuit; the MCU control circuit acquires the connection state of an external alternating current power supply through the AC detection circuit; the power supply switching circuit comprises a switching tube Q1, a relay and a single-pole double-throw switch, wherein the switching tube Q1 is electrically connected with the MCU control circuit; the switch tube Q1 is electrically connected with a relay, and the relay controls the connection state of the single-pole double-throw switch; one terminal of the single-pole double-throw switch is electrically connected with the inverter bridge circuit, one terminal of the single-pole double-throw switch is used for being electrically connected with a low-voltage direct-current power supply, and one terminal of the single-pole double-throw switch is used for being electrically connected with an AC-DC switching power supply; the MCU control circuit controls the state of the switching tube Q1 according to the acquired connection state of the external alternating current power supply, and the switching tube Q1 controls the state of the relay; when the connection state of the external alternating current power supply obtained by the MCU control circuit is the connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the AC-DC switching power supply; when the connection state of the external alternating current power supply obtained by the MCU control circuit is a non-connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the low-voltage direct current power supply.
Compared with the prior art, one of the beneficial effects of the technical scheme in the application is that the DC-AC inverter is arranged in the piezoelectric ceramic air pump, so that the piezoelectric ceramic air pump can be suitable for a power supply of direct current power supply, the application scene of the piezoelectric ceramic air pump is expanded, and the piezoelectric ceramic air pump is not limited to an occasion of alternating current power supply any more.
Compared with the prior art, the technical scheme has the advantages that a low-voltage direct-current power supply is arranged in the piezoelectric ceramic air pump, so that the piezoelectric ceramic air pump can be suitable for outdoor or other portable scenes without alternating-current power supply; and the advantages of high energy conversion efficiency, electricity saving and low noise of the piezoelectric ceramic air pump can be exerted. The air-pumping device is very suitable for the application scene of pumping air for the bucket containing the fish during outdoor fishing. Because the piezoelectric ceramic air pump directly converts alternating current energy into mechanical vibration without an intermediate conversion process involving other electromagnetism, the energy conversion efficiency is higher, the power consumption is less when the same air quantity is pumped out, and the power is saved; therefore, under the condition of the power supply of a low-voltage direct-current power supply with the same capacity, the piezoelectric ceramic air pump can keep working for a longer time. And because there is no electric motor, the integral working noise of the air pump is very low, very suitable for fishing like the occasion that has requirements for the quiet environment.
Compare with prior art, the third beneficial effect of the technical scheme in this application is, can adjust the voltage signal frequency of inverter bridge circuit output through the PWM pulse control signal frequency of adjustment MCU control circuit output to the operating frequency of adjustment piezoceramics air pump makes the operating frequency of piezoceramics air pump can adjust to the most suitable frequency, thereby improves the energy conversion efficiency of piezoceramics air pump.
Compared with the prior art, the technical scheme has the beneficial effects that the duty ratio of the signal can be controlled through the PWM pulse; the amplitude of the voltage signal output by the inverter bridge circuit is adjusted, so that the vibration amplitude of the piezoelectric ceramic air pump is adjusted, the vibration amplitude of the piezoelectric ceramic air pump can be adjusted to the most suitable vibration amplitude, and the energy conversion efficiency of the piezoelectric ceramic air pump is improved.
Compare with prior art, the beneficial effect of the technical scheme in this application is that, power supply change over switch's setting for piezoceramics air pump can seamlessly switch in alternating current power supply and direct current power supply scene. In the occasion of alternating current power supply, the plug-and-play switching can be conveniently carried out to alternating current power supply, the built-in low-voltage direct current power supply can be charged through alternating current, and the process of dismounting the built-in low-voltage direct current power supply is not needed.
Compared with the prior art, the beneficial effect of the technical scheme in this application is that, when externally exchanging power supply, can also control PWM pulse control signal's frequency and duty cycle via MCU control circuit, inverter bridge circuit and step-up transformer to control the alternating current frequency and the range of inverter bridge circuit output, thereby make the piezoceramics air pump can work on best operating frequency and range, further improved the work efficiency of piezoceramics air pump.
Drawings
FIG. 1 is a schematic diagram of the connection of a piezoelectric ceramic air pump suitable for outdoor portability to an external low voltage DC power supply;
FIG. 2 is one of the schematic block diagrams of the DC-AC inverter and piezoceramic wafer connections;
FIG. 3 is a second schematic block diagram of the DC-AC inverter and piezoceramic wafer connection;
FIG. 4 is a schematic diagram of the inverter bridge and step-up transformer connections in a DC-AC inverter;
FIG. 5 is one of the schematic block diagrams of a piezoceramic air pump that is suitable for both DC and AC power;
FIG. 6 is a second schematic block diagram of a piezoceramic air pump suitable for both DC and AC power;
fig. 7 is a schematic diagram of a piezoelectric pump in a practical application scenario.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings.
As shown in fig. 1 and 2, an embodiment of a piezoceramic air pump suitable for being portable outdoors comprises a DC-AC inverter and a piezoceramic air pump main body; the DC-AC inverter is used for converting direct current provided by an external direct current power supply into alternating current; the input end of the DC-AC inverter is electrically connected with an external direct current power supply to obtain direct current input; the output end of the DC-AC inverter is electrically connected with the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body to provide alternating current for the piezoelectric ceramic piece, and the alternating current drives the piezoelectric ceramic piece to vibrate.
As shown in fig. 1 and 2, in an embodiment of a piezoelectric ceramic air pump suitable for being carried outdoors, a DC-AC inverter includes an MCU control circuit, an inverter bridge circuit and a step-up transformer; the MCU control circuit is electrically connected with the input end of the inverter bridge circuit, and the output end of the inverter bridge circuit is electrically connected with the input end of the step-up transformer; the MCU control circuit outputs a pair of PWM pulse control signals with opposite polarities to the inverter bridge circuit; the pair of PWM pulse control signals with opposite polarities is used for controlling the frequency of the alternating current output by the inverter bridge circuit.
In some embodiments of the piezoelectric ceramic air pump suitable for outdoor portability, which are not shown in the drawings, the MCU control circuit is further provided with a frequency adjustment interface; the frequency adjusting interface is used for receiving an external frequency adjusting instruction, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the received frequency adjusting instruction; the frequency of the PWM pulse control signal determines the frequency of the voltage signal output by the inverter bridge circuit. The MCU control circuit is also provided with a voltage regulation interface; the voltage regulation interface is used for receiving an external voltage regulation instruction, the MCU control circuit regulates the duty ratio of a PWM pulse control signal output by the MCU control circuit according to the received voltage regulation instruction, and the duty ratio of the PWM pulse control signal determines the voltage output by the inverter bridge circuit.
As shown in fig. 3, in an embodiment of the piezoelectric ceramic air pump suitable for being portable outdoors, the MCU control circuit is further provided with a frequency adjustment switch, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the state of the frequency adjustment switch; the MCU control circuit is also provided with a duty ratio adjuster, and the duty ratio of the PWM pulse control signal output by the MCU control circuit is adjusted by the MCU control circuit according to the state of the duty ratio adjuster.
The piezoelectric pump on the market is usually power frequency alternating current power supply, the frequency can not be changed, in actual use, the best working frequency of the piezoelectric ceramic piece is found to be not power frequency, the best working frequency of the one-way valve piece is not power frequency due to different materials and thicknesses, the working frequency of the pump is changed by adjusting the period of the PWM pulse control signal, and the performance of the pump can be brought into play in the best state. The MCU control circuit is connected with the inverter bridge circuit and provides a pair of PWM pulse control signals with opposite polarities for the inverter bridge circuit, and the period, namely the frequency of the PWM pulse control signals can be manually set by a microprocessor in the MCU or regulated by an external instruction or a frequency regulating switch so as to meet the requirement that the piezoelectric ceramic piece and the one-way valve piece work at the optimal working frequency.
The flow and pressure of the piezoelectric pump on the market are generally not adjustable; in the application, the power supply voltages at two ends of the piezoelectric ceramic piece can be changed by changing the duty ratio of the PWM pulse signal, the vibration amplitude of the piezoelectric ceramic piece can be determined by the power supply voltages at two ends of the piezoelectric ceramic piece, and the flow of the piezoelectric pump is determined by the vibration amplitude; the flow and pressure adjustable function of the piezoelectric pump is achieved by changing the duty ratio of the PWM pulse signal.
As shown in fig. 4, in an embodiment of the piezoelectric ceramic air pump suitable for being portable outdoors, the inverter bridge circuit includes two groups of MOS transistors, and one PWM signal controls one group of MOS transistors; when the PWM1 is positive and the PWM2 is negative, the VT2 and the VT3 are conducted, and the VT1 and the VT4 are cut off; when PWM1 is negative and PWM2 is positive, VT1 and VT4 are turned on and VT2 and VT3 are turned off. Because two paths of PWM signals are complementary, two groups of MOS tubes are alternately and repeatedly conducted to complete direct current and alternating current conversion. The inverter bridge circuit switches on the primary side of the boosting transformer according to a PWM pulse control signal output by the MCU control circuit, the secondary side of the boosting transformer boosts the pulsating primary voltage to provide power for a piezoelectric ceramic piece in the piezoelectric ceramic pump, the frequency of the voltage output by the secondary side of the boosting transformer is related to the period of PWM, and the voltage value is related to the duty ratio of the PWM.
In some embodiments, not shown in the drawings, of the piezoelectric ceramic air pump suitable for being portable outdoors, the MCU control circuit is further provided with a communication module for communicating with an external terminal to obtain an external control command.
As shown in fig. 5, in an embodiment of the piezoelectric ceramic air pump suitable for being portable outdoors, a power supply switch is further included; the power supply change-over switch is used for controlling the connection relation between the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and the power supply; in the first state of the power supply changeover switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with the output end of the DC-AC inverter, and the piezoelectric ceramic air pump can supply power through an external direct-current power supply at the moment; at this time, as shown in FIG. 5, the output terminal b-1 of the step-up transformer is electrically connected to the terminal a-1 of the piezoelectric ceramic plate, and the output terminal b-2 of the step-up transformer is electrically connected to the terminal a-2 of the piezoelectric ceramic plate. In a second state of the power supply changeover switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically disconnected with the output end of the DC-AC inverter, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with an alternating current power supply, the piezoelectric ceramic air pump can supply power through an external alternating current power supply at the moment, the output terminal c-1 of the external alternating current power supply is electrically connected with the terminal a-1 of the piezoelectric ceramic piece at the moment, and the output terminal c-2 of the external alternating current power supply is electrically connected with the terminal a-2 of the piezoelectric ceramic piece.
As shown in fig. 1 and fig. 2, an embodiment of a piezoelectric ceramic air pump suitable for being carried outdoors further includes a low-voltage dc power supply; the output end of the low-voltage direct-current power supply is electrically connected with the input end of the DC-AC inverter.
In some embodiments of the piezoceramic air pump suitable for outdoor portability, not shown in the drawings, the low-voltage dc power source is a power source below 36V safe voltage, and comprises any one of a dry cell, a lithium cell, a lead-acid cell, or a battery pack.
In an embodiment of the piezoceramic air pump suitable for being portable outdoors, not shown in some of the figures, the low-voltage DC power supply is a power supply device capable of providing a safe voltage below 36V, including any one of an onboard charging power supply, a USB power supply or an AC-DC adapter.
As shown in fig. 6, an embodiment of the piezoelectric ceramic air pump suitable for being carried outdoors further includes an AC-DC switching power supply and a charging management circuit; the AC-DC switching power supply is used for obtaining electric energy from an external alternating current power supply; the AC-DC switching power supply is electrically connected with the MCU control circuit and supplies power to the MCU control circuit; the AC-DC switching power supply is electrically connected with the charging management circuit, and the charging management circuit is electrically connected with the low-voltage direct-current power supply; the low-voltage direct-current power supply is electrically connected with the overcharge management circuit to obtain electric energy from an external alternating-current power supply for charging.
As shown in fig. 6, an embodiment of the piezoelectric ceramic air pump suitable for being carried outdoors further includes an AC detection circuit and a power switching circuit; one end of the AC detection circuit is electrically connected with the AC-DC switching power supply; the other end of the AC detection circuit is electrically connected with the MCU control circuit; the MCU control circuit acquires the connection state of an external alternating current power supply through the AC detection circuit; the power supply switching circuit comprises a switching tube Q1, a relay and a single-pole double-throw switch, wherein the switching tube Q1 is electrically connected with the MCU control circuit; the switch tube Q1 is electrically connected with a relay, and the relay controls the connection state of the single-pole double-throw switch; one terminal of the single-pole double-throw switch is electrically connected with the inverter bridge circuit, one terminal of the single-pole double-throw switch is used for being electrically connected with a low-voltage direct-current power supply, and one terminal of the single-pole double-throw switch is used for being electrically connected with an AC-DC switching power supply; the MCU control circuit controls the state of the switching tube Q1 according to the acquired connection state of the external alternating current power supply, and the switching tube Q1 controls the state of the relay; when the connection state of the external alternating current power supply obtained by the MCU control circuit is the connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the AC-DC switching power supply; when the connection state of the external alternating current power supply obtained by the MCU control circuit is a non-connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the low-voltage direct current power supply.
As shown in fig. 6, in a scene with AC power supply, AC power is converted into DC power VCC by an AC-DC switching power supply circuit, and one path of VCC charges a low-voltage DC power supply through a charging management circuit, and the other path of VCC generates VDD through a diode D1 to supply power to an MCU control circuit. When alternating current is supplied, VCC provides a control signal for the MCU control circuit through the AC detection circuit, Q1 is cut off, the relay is powered off, the ends of the switches a and c are communicated, VCC supplies power for the inverter bridge circuit through the ends of the switches a and c, and supplies power for the piezoelectric ceramic piece after being boosted by the booster transformer.
As shown in fig. 6, when the MCU control circuit is used in a scene without ac power, the low voltage dc power BT generates VDD via the diode D2 to power the MCU control circuit. Because VCC =0, the AC detection circuit can not provide a control signal for the MCU control circuit, Q1 is conducted, the relay is attracted, the a end and the b end of the switch are communicated, the a end and the c end are disconnected, the low-voltage direct-current power supply BT supplies power for the inverter bridge through the a end and the b end, and supplies power for the piezoelectric ceramic piece after being boosted through the step-up transformer. The design ensures that the piezoelectric ceramic air pump can be suitable for both alternating current power supply and direct current power supply. During alternating current power supply, the frequency and the amplitude of voltage signals output to two ends of the piezoelectric ceramic piece can be adjusted through the MCU control circuit and the inverter bridge circuit.
Fig. 7 is a schematic diagram of a piezoelectric pump in a practical application scenario, where the piezoelectric pump in fig. 7 is a piezoelectric ceramic pump for pumping air into a water body; the piezoelectric pump in the figure is internally provided with a low-voltage direct-current power supply for independent power supply, so that the application requirement in a long-time outdoor portable scene is maintained. Because the energy conversion efficiency of the piezoelectric pump is high, the capacity and the volume of the built-in low-voltage direct-current power supply do not need to be too large, so that the volume of the piezoelectric pump and the low-voltage direct-current power supply is integrally reduced, the piezoelectric pump is more convenient to carry, and the piezoelectric pump is more suitable for the requirements of outdoor and portable application scenes. In some applications, the piezoelectric ceramic pump has small volume and light weight, and is very convenient to carry and use outdoors. When in use, the water bucket is hung on the edge of the water bucket lightly, and is quite quiet because of no noise of the motor.
Adopt the air pump of design scheme in this application to have following advantage: the low power consumption and low noise of the product are realized, and the product can be driven by depending on the power supply of a battery for a long time; the piezoelectric ceramic air pump is not affected by the ambient temperature, and has stable working performance and long service life. Can use under the scene that does not have the alternating current in the open air, can charge the continuation of the journey through treasured, the car that charges. The appearance can be smaller, the weight is light, and the carrying is convenient; the low-voltage direct current is used for supplying power, so that the use is safer; the frequency of the power supply of the piezoelectric ceramic piece can be changed, so that the piezoelectric ceramic piece and the one-way valve work in the best state. The voltage value of the power supply of the piezoelectric ceramic plate can be changed, and the flow and the pressure of the pump can be adjusted.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. The utility model provides a piezoceramics air pump suitable for outdoor portable which characterized in that:
the piezoelectric ceramic air pump comprises a DC-AC inverter and a piezoelectric ceramic air pump main body;
the DC-AC inverter is used for converting direct current provided by an external direct current power supply into alternating current;
the input end of the DC-AC inverter is electrically connected with an external direct current power supply to obtain direct current input;
the output end of the DC-AC inverter is electrically connected with the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and provides alternating current for the piezoelectric ceramic piece, and the alternating current drives the piezoelectric ceramic piece to vibrate.
2. The piezoceramic air pump adapted for outdoor portability according to claim 1,
the DC-AC inverter comprises an MCU control circuit, an inverter bridge circuit and a booster transformer;
the MCU control circuit is electrically connected with the input end of the inverter bridge circuit, and the output end of the inverter bridge circuit is electrically connected with the input end of the step-up transformer;
the MCU control circuit outputs a pair of PWM pulse control signals with opposite polarities to the inverter bridge circuit; the pair of PWM pulse control signals with opposite polarities is used for controlling the frequency and the amplitude of the alternating current output by the inverter bridge circuit.
3. The piezoceramic air pump adapted for outdoor portability according to claim 2,
the MCU control circuit is also provided with a frequency adjusting interface; the frequency adjusting interface is used for receiving an external frequency adjusting instruction, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the received frequency adjusting instruction;
or the MCU control circuit is also provided with a frequency adjusting switch, and the MCU control circuit adjusts the frequency of the PWM pulse control signal output by the MCU control circuit according to the state of the frequency adjusting switch;
the frequency of the PWM pulse control signal determines the frequency of the voltage signal output by the inverter bridge circuit.
4. The piezoceramic air pump adapted for outdoor portability according to claim 2,
the MCU control circuit is also provided with a voltage regulation interface; the voltage regulation interface is used for receiving an external voltage regulation instruction, and the MCU control circuit regulates the duty ratio of a PWM pulse control signal output by the MCU control circuit according to the received voltage regulation instruction;
or the MCU control circuit is also provided with a duty ratio adjuster, and the MCU control circuit adjusts the duty ratio of the PWM pulse control signal output by the MCU control circuit according to the state of the duty ratio adjuster;
the duty ratio of the PWM pulse control signal determines the voltage output by the inverter bridge circuit.
5. The piezoceramic air pump adapted for outdoor portability according to claim 1,
the power supply switching device also comprises a power supply switching switch;
the power supply change-over switch is used for controlling the connection relation between the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body and an external power supply;
in the first state of the power supply changeover switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with the output end of the DC-AC inverter, and the piezoelectric ceramic air pump can obtain power supply through a direct current power supply connected with the DC-AC inverter;
and in the second state of the power supply change-over switch, the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected and disconnected with the output end of the DC-AC inverter, and the piezoelectric ceramic piece in the piezoelectric ceramic air pump main body is electrically connected with an external alternating current power supply, so that the piezoelectric ceramic air pump can supply power through the external alternating current power supply.
6. The piezoceramic air pump adapted for outdoor portability according to claim 1,
the device also comprises a low-voltage direct-current power supply;
the output end of the low-voltage direct-current power supply is electrically connected with the input end of the DC-AC inverter.
7. The piezoceramic air pump adapted for outdoor portability according to claim 6,
the low-voltage direct-current power supply is a power supply with the safety voltage lower than 36V and comprises any one of a dry battery, a lithium battery, a lead-acid battery or a battery pack.
8. The piezoceramic air pump adapted for outdoor portability according to claim 6,
the low-voltage direct-current power supply is a power supply device capable of providing a safe voltage lower than 36V, and comprises any one of a vehicle-mounted charging power supply, a USB power supply or an AC-DC adapter.
9. The piezoceramic air pump adapted for outdoor portability according to claim 6,
the charging management circuit also comprises an AC-DC switching power supply and a charging management circuit; the AC-DC switching power supply is used for obtaining electric energy from an external alternating current power supply; the AC-DC switching power supply is electrically connected with the MCU control circuit and supplies power to the MCU control circuit;
the AC-DC switching power supply is electrically connected with the charging management circuit, and the charging management circuit is electrically connected with the low-voltage direct-current power supply; the low-voltage direct-current power supply is electrically connected with the overcharge management circuit to obtain electric energy from an external alternating-current power supply for charging.
10. The piezoceramic air pump adapted for outdoor portability according to claim 9,
the device also comprises an AC detection circuit and a power supply switching circuit;
one end of the AC detection circuit is electrically connected with the AC-DC switching power supply; the other end of the AC detection circuit is electrically connected with the MCU control circuit; the MCU control circuit acquires the connection state of an external alternating current power supply through the AC detection circuit;
the power supply switching circuit comprises a switching tube Q1, a relay and a single-pole double-throw switch, wherein the switching tube Q1 is electrically connected with the MCU control circuit; the switch tube Q1 is electrically connected with a relay, and the relay controls the connection state of the single-pole double-throw switch; one terminal of the single-pole double-throw switch is electrically connected with the inverter bridge circuit, one terminal of the single-pole double-throw switch is used for being electrically connected with a low-voltage direct-current power supply, and one terminal of the single-pole double-throw switch is used for being electrically connected with an AC-DC switching power supply;
the MCU control circuit controls the state of the switching tube Q1 according to the acquired connection state of the external alternating current power supply, and the switching tube Q1 controls the state of the relay;
when the connection state of the external alternating current power supply obtained by the MCU control circuit is the connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the AC-DC switching power supply;
when the connection state of the external alternating current power supply obtained by the MCU control circuit is a non-connection state of the external alternating current power supply, the state of the single-pole double-throw switch can enable the inverter bridge circuit to be electrically connected with the low-voltage direct current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220995062.0U CN217642851U (en) | 2022-04-27 | 2022-04-27 | Piezoelectric ceramic air pump suitable for outdoor portability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220995062.0U CN217642851U (en) | 2022-04-27 | 2022-04-27 | Piezoelectric ceramic air pump suitable for outdoor portability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217642851U true CN217642851U (en) | 2022-10-21 |
Family
ID=83650327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220995062.0U Active CN217642851U (en) | 2022-04-27 | 2022-04-27 | Piezoelectric ceramic air pump suitable for outdoor portability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217642851U (en) |
-
2022
- 2022-04-27 CN CN202220995062.0U patent/CN217642851U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9061595B2 (en) | Auxiliary drive apparatus and method of manufacturing same | |
| CN101151778B (en) | Charge control circuit for a vehicle vacuum cleaner battery | |
| TWI266712B (en) | Voltage converter control apparatus, voltage conversion method, and storage medium, program, drive system, and vehicle having the drive system | |
| EP1458076A3 (en) | Engine generator | |
| EP1684397A2 (en) | Portable compound battery unit management system | |
| WO2003071651A3 (en) | Hybrid power supply | |
| EP1701426A3 (en) | Battery charger | |
| DE60123027D1 (en) | DYNAMICALLY CONTROLLED CHARGE PUMP PERFORMANCE CONVERTER WITH ULTRASONIC SENSOR | |
| WO2016112784A1 (en) | Uninterrupted power supply and control method thereof | |
| CN111313707B (en) | DC/DC power supply conversion system | |
| CN102474190A (en) | Charging device for charging a battery pack | |
| CN1195920A (en) | Switching power supply | |
| US5712549A (en) | DC Motor drive assembly having a controller/charge with regenerative braking | |
| CN104104233A (en) | Small high voltage power supply module capable of rapidly discharging electricity and continuously regulating voltage | |
| CN217642851U (en) | Piezoelectric ceramic air pump suitable for outdoor portability | |
| WO2023206175A1 (en) | Outdoors portable piezoelectric ceramic air pump | |
| CN100499950C (en) | Self-adaptive output white light LED driver | |
| CN1199947A (en) | Charging apparatus | |
| JP2006114486A (en) | Fuel cell power supply system | |
| KR20050021409A (en) | Parallel Pulse Charging Power Conditioning System using more than two batteries for the standalone solar or windpower generation | |
| TW200903960A (en) | Cascade power converter | |
| CN1551448A (en) | Electronic equipment | |
| CN2405366Y (en) | Full automatic charging arrangement | |
| CN109217671A (en) | One kind floating ground voltage stabilizing power supplying circuit | |
| CN211556934U (en) | Micropump capable of stably supplying power to lithium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |